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Overview
| Comment: | 1.0.63.0 |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | sourceforge |
| Files: | files | file ages | folders |
| SHA1: |
26297c39cc781d1b5dec9dd8424712a7 |
| User & Date: | rmsimpson 2009-06-29 22:59:08 |
Context
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2009-07-02
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| 17:46 | 1.0.63.0 check-in: 25cc9c6500 user: rmsimpson tags: sourceforge | |
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2009-06-29
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| 22:59 | 1.0.63.0 check-in: 26297c39cc user: rmsimpson tags: sourceforge | |
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2009-06-19
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| 21:04 | 3.6.15 check-in: e7d1758f41 user: rmsimpson tags: sourceforge | |
Changes
Changes to Doc/Extra/dbfactorysupport.html.
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<configuration>
<system.data>
<DbProviderFactories>
<remove invariant="System.Data.SQLite"/>
<add name="SQLite Data Provider" invariant="System.Data.SQLite"
description=".Net Framework Data Provider for SQLite"
type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite,
Version=1.0.62.0, Culture=neutral,
PublicKeyToken=db937bc2d44ff139"/>
</DbProviderFactories>
</system.data>
</configuration>
</pre>
</div>
<p>
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<configuration>
<system.data>
<DbProviderFactories>
<remove invariant="System.Data.SQLite"/>
<add name="SQLite Data Provider" invariant="System.Data.SQLite"
description=".Net Framework Data Provider for SQLite"
type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite,
Version=1.0.63.0, Culture=neutral,
PublicKeyToken=db937bc2d44ff139"/>
</DbProviderFactories>
</system.data>
</configuration>
</pre>
</div>
<p>
|
Changes to Doc/Extra/version.html.
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</td>
</tr>
</table>
</div>
<div id="mainSection">
<div id="mainBody">
<h1 class="heading">Version History</h1>
<p><b>1.0.62.0 - June 20, 2009</b></p>
<ul>
<li>Code merge with SQLite 3.6.15</li>
<li>Fixed the decimal reading bug in the SQLiteDataReader</li>
<li>Changed Join()'s to Sleep()'s in the statement retry code to prevent message
pumping</li>
<li>Fixed a bad pointer conversion when retrieving blobs using GetBytes() in
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> > > > > > > > > > > > > > > > > |
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</td>
</tr>
</table>
</div>
<div id="mainSection">
<div id="mainBody">
<h1 class="heading">Version History</h1>
<p><b>1.0.63.0 - June 29, 2009</b></p>
<ul>
<li>Code merge with SQLite 3.6.16</li>
<li>Check the autocommit mode of the connection to which a transaction is bound
during the disposal of the transaction. If autocommit is enabled, then the
database has already rolled back the transaction and we don't need to do it
during dispose, and can quietly ignore the step without throwing an error.</li>
<li>Eliminated the mergebin step altogether. It was developed primarily to
merge the Compact Framework binaries together, but since we're not doing that
anymore, its use is limited. Its non-standard method of merging a binary
on the desktop framework is redundant as well. The desktop binary now
hard-links to MSCOREE, but as of Windows XP, this was redundant as well since XP
and beyond automatically attempt to load MSCOREE on startup when a DLL has a
.NET header.</li>
<li>More improvements to the test.exe program for running the tests against Sql
Server for comparison purposes.</li>
</ul>
<p><b>1.0.62.0 - June 20, 2009</b></p>
<ul>
<li>Code merge with SQLite 3.6.15</li>
<li>Fixed the decimal reading bug in the SQLiteDataReader</li>
<li>Changed Join()'s to Sleep()'s in the statement retry code to prevent message
pumping</li>
<li>Fixed a bad pointer conversion when retrieving blobs using GetBytes() in
|
Changes to Doc/SQLite.NET.chm.
cannot compute difference between binary files
Changes to SQLite.Interop/SQLite.Interop.rc.
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///////////////////////////////////////////////////////////////////////////// // // Version // VS_VERSION_INFO VERSIONINFO FILEVERSION 1,0,62,0 PRODUCTVERSION 1,0,0,0 FILEFLAGSMASK 0x17L #ifdef _DEBUG FILEFLAGS 0x1L #else FILEFLAGS 0x0L #endif ................................................................................ BEGIN BLOCK "StringFileInfo" BEGIN BLOCK "040904b0" BEGIN VALUE "Comments", "http://sqlite.phxsoftware.com" VALUE "FileDescription", "System.Data.SQLite Interop Library" VALUE "FileVersion", "1.0.62.0" VALUE "InternalName", "SQLite.Interop.DLL" VALUE "LegalCopyright", "Released to the public domain" VALUE "OriginalFilename", "SQLite3.DLL 3.6.15" VALUE "ProductName", "System.Data.SQLite" VALUE "ProductVersion", "1.0" END END BLOCK "VarFileInfo" BEGIN VALUE "Translation", 0x409, 1200 |
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///////////////////////////////////////////////////////////////////////////// // // Version // VS_VERSION_INFO VERSIONINFO FILEVERSION 1,0,63,0 PRODUCTVERSION 1,0,0,0 FILEFLAGSMASK 0x17L #ifdef _DEBUG FILEFLAGS 0x1L #else FILEFLAGS 0x0L #endif ................................................................................ BEGIN BLOCK "StringFileInfo" BEGIN BLOCK "040904b0" BEGIN VALUE "Comments", "http://sqlite.phxsoftware.com" VALUE "FileDescription", "System.Data.SQLite Interop Library" VALUE "FileVersion", "1.0.63.0" VALUE "InternalName", "SQLite.Interop.DLL" VALUE "LegalCopyright", "Released to the public domain" VALUE "OriginalFilename", "SQLite3.DLL 3.6.16" VALUE "ProductName", "System.Data.SQLite" VALUE "ProductVersion", "1.0" END END BLOCK "VarFileInfo" BEGIN VALUE "Translation", 0x409, 1200 |
Changes to SQLite.Interop/SQLite.Interop.vcproj.
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> | > | < | > | > | < > | > | < > > < < < < < < < | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < 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< < < |
66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 ... 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 ... 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 ... 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 ... 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 ... 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 ... 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 ... 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 ... 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 .... 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 |
Name="VCResourceCompilerTool" /> <Tool Name="VCPreLinkEventTool" /> <Tool Name="VCLinkerTool" AdditionalDependencies="..\System.Data.SQLite\bin\System.Data.SQLite.netmodule" OutputFile="../bin/System.Data.SQLite.DLL" GenerateManifest="false" IgnoreDefaultLibraryNames="" ModuleDefinitionFile="src\sqlite3.def" EmbedManagedResourceFile="" DelayLoadDLLs="advapi32.dll" RandomizedBaseAddress="1" DataExecutionPrevention="0" ImportLibrary="" TargetMachine="1" KeyFile="..\System.Data.SQLite\System.Data.SQLite.snk" CLRUnmanagedCodeCheck="true" /> <Tool Name="VCALinkTool" /> <Tool Name="VCManifestTool" EmbedManifest="true" ................................................................................ Name="VCFxCopTool" /> <Tool Name="VCAppVerifierTool" /> <Tool Name="VCPostBuildEventTool" CommandLine="" /> </Configuration> <Configuration Name="Release|Pocket PC 2003 (ARMV4)" OutputDirectory="Pocket PC 2003 (ARMV4)\$(ConfigurationName)" IntermediateDirectory="Pocket PC 2003 (ARMV4)\$(ConfigurationName)" ConfigurationType="2" ................................................................................ Name="VCPreLinkEventTool" CommandLine="" /> <Tool Name="VCLinkerTool" IgnoreImportLibrary="true" AdditionalOptions=" /subsystem:windowsce,4.20 /ARMPADCODE" OutputFile="../bin/CompactFramework/$(InputName).063.DLL" AdditionalLibraryDirectories="" IgnoreDefaultLibraryNames="" ModuleDefinitionFile="src\sqlite3.def" AddModuleNamesToAssembly="" EmbedManagedResourceFile="" EntryPointSymbol="" MergeSections="" ................................................................................ Name="VCResourceCompilerTool" /> <Tool Name="VCPreLinkEventTool" /> <Tool Name="VCLinkerTool" AdditionalDependencies="..\System.Data.SQLite\bin\System.Data.SQLite.netmodule" OutputFile="../bin/Itanium/System.Data.SQLite.DLL" ModuleDefinitionFile="src\sqlite3.def" EmbedManagedResourceFile="" DelayLoadDLLs="advapi32.dll" RandomizedBaseAddress="1" DataExecutionPrevention="0" ImportLibrary="" TargetMachine="5" KeyFile="..\System.Data.SQLite\System.Data.SQLite.snk" CLRUnmanagedCodeCheck="true" /> <Tool Name="VCALinkTool" /> <Tool Name="VCManifestTool" EmbedManifest="true" ................................................................................ Name="VCFxCopTool" /> <Tool Name="VCAppVerifierTool" /> <Tool Name="VCPostBuildEventTool" CommandLine="" /> </Configuration> <Configuration Name="Release|x64" OutputDirectory="x64\$(ConfigurationName)" IntermediateDirectory="x64\$(ConfigurationName)" ConfigurationType="2" ................................................................................ Name="VCResourceCompilerTool" /> <Tool Name="VCPreLinkEventTool" /> <Tool Name="VCLinkerTool" AdditionalDependencies="..\System.Data.SQLite\bin\System.Data.SQLite.netmodule" OutputFile="../bin/x64/System.Data.SQLite.DLL" ModuleDefinitionFile="src\sqlite3.def" EmbedManagedResourceFile="" DelayLoadDLLs="advapi32.dll" RandomizedBaseAddress="1" DataExecutionPrevention="0" ImportLibrary="" TargetMachine="17" KeyFile="..\System.Data.SQLite\System.Data.SQLite.snk" CLRUnmanagedCodeCheck="true" /> <Tool Name="VCALinkTool" /> <Tool Name="VCManifestTool" EmbedManifest="true" ................................................................................ Name="VCFxCopTool" /> <Tool Name="VCAppVerifierTool" /> <Tool Name="VCPostBuildEventTool" CommandLine="" /> </Configuration> <Configuration Name="Debug|Win32" OutputDirectory="$(ConfigurationName)" IntermediateDirectory="$(ConfigurationName)" ConfigurationType="2" ................................................................................ Name="VCMIDLTool" /> <Tool Name="VCCLCompilerTool" AdditionalOptions="/GS-" Optimization="0" PreprocessorDefinitions="WIN32;_DEBUG;_WINDOWS;_USRDLL;_CRT_SECURE_NO_DEPRECATE;NO_TCL;THREADSAFE=1;SQLITE_HAS_CODEC;SQLITE_ENABLE_COLUMN_METADATA;SQLITE_ENABLE_FTS3;SQLITE_ENABLE_RTREE;SQLITE_ENABLE_LOAD_EXTENSION;SQLITE_SOUNDEX" BasicRuntimeChecks="3" RuntimeLibrary="3" RuntimeTypeInfo="false" WarningLevel="3" DebugInformationFormat="3" /> <Tool Name="VCManagedResourceCompilerTool" /> <Tool Name="VCResourceCompilerTool" ................................................................................ Name="VCLinkerTool" OutputFile="../bin/$(InputName).DLL" LinkIncremental="1" ModuleDefinitionFile="src\sqlite3.def" EmbedManagedResourceFile="" DelayLoadDLLs="advapi32.dll" GenerateDebugInformation="true" ImportLibrary="" /> <Tool Name="VCALinkTool" /> <Tool Name="VCManifestTool" EmbedManifest="true" ................................................................................ <Filter Name="Extras" > <File RelativePath=".\interop.c" > </File> </Filter> <File RelativePath=".\SQLite.Interop.rc" > </File> </Files> <Globals> </Globals> </VisualStudioProject> |
Changes to SQLite.Interop/crypt.c.
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HCRYPTPROV g_hProvider = 0; // Global instance of the cryptographic provider
#define SQLITECRYPTERROR_PROVIDER "Cryptographic provider not available"
// Needed for re-keying
static void * sqlite3pager_get_codecarg(Pager *pPager)
{
return (pPager->xCodec) ? pPager->pCodecArg: NULL;
}
void sqlite3_activate_see(const char *info)
{
}
// Create a cryptographic context. Use the enhanced provider because it is available on
................................................................................
return TRUE;
}
// Create or update a cryptographic context for a pager.
// This function will automatically determine if the encryption algorithm requires
// extra padding, and if it does, will create a temp buffer big enough to provide
// space to hold it.
static LPCRYPTBLOCK CreateCryptBlock(HCRYPTKEY hKey, Pager *pager, LPCRYPTBLOCK pExisting)
{
LPCRYPTBLOCK pBlock;
if (!pExisting) // Creating a new cryptblock
{
pBlock = sqlite3_malloc(sizeof(CRYPTBLOCK));
if (!pBlock) return NULL;
................................................................................
pBlock->hWriteKey = hKey;
}
else // Updating an existing cryptblock
{
pBlock = pExisting;
}
pBlock->pPager = pager;
pBlock->dwPageSize = (DWORD)pager->pageSize;
pBlock->dwCryptSize = pBlock->dwPageSize;
// Existing cryptblocks may have a buffer, if so, delete it
if (pBlock->pvCrypt)
{
sqlite3_free(pBlock->pvCrypt);
pBlock->pvCrypt = NULL;
................................................................................
return NULL;
}
return pBlock;
}
// Destroy a cryptographic context and any buffers and keys allocated therein
static void DestroyCryptBlock(LPCRYPTBLOCK pBlock)
{
// Destroy the read key if there is one
if (pBlock->hReadKey)
{
CryptDestroyKey(pBlock->hReadKey);
}
// If there's a writekey and its not equal to the readkey, destroy it
................................................................................
{
sqlite3_free(pBlock->pvCrypt);
}
// All done with this cryptblock
sqlite3_free(pBlock);
}
// Encrypt/Decrypt functionality, called by pager.c
void * sqlite3Codec(void *pArg, void *data, Pgno nPageNum, int nMode)
{
LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)pArg;
DWORD dwPageSize;
LPVOID pvTemp;
if (!pBlock) return data;
// Make sure the page size for the pager is still the same as the page size
// for the cryptblock. If the user changed it, we need to adjust!
if (nMode != 2)
{
if (pBlock->pPager->pageSize != pBlock->dwPageSize)
{
// Update the cryptblock to reflect the new page size
CreateCryptBlock(pBlock->hReadKey, pBlock->pPager, pBlock);
}
}
switch(nMode)
{
case 0: // Undo a "case 7" journal file encryption
case 2: // Reload a page
case 3: // Load a page
if (!pBlock->hReadKey) break;
................................................................................
}
// Called by sqlite and sqlite3_key_interop to attach a key to a database.
int sqlite3CodecAttach(sqlite3 *db, int nDb, const void *pKey, int nKeyLen)
{
int rc = SQLITE_ERROR;
HCRYPTKEY hKey = 0;
// No key specified, could mean either use the main db's encryption or no encryption
if (!pKey || !nKeyLen)
{
if (!nDb)
{
return SQLITE_OK; // Main database, no key specified so not encrypted
}
else // Attached database, use the main database's key
{
// Get the encryption block for the main database and attempt to duplicate the key
// for use by the attached database
LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)sqlite3pager_get_codecarg(sqlite3BtreePager(db->aDb[0].pBt));
if (!pBlock) return SQLITE_OK; // Main database is not encrypted so neither will be any attached database
if (!pBlock->hReadKey) return SQLITE_OK; // Not encrypted
if (!CryptDuplicateKey(pBlock->hReadKey, NULL, 0, &hKey))
return rc; // Unable to duplicate the key
}
................................................................................
return rc;
}
}
// Create a new encryption block and assign the codec to the new attached database
if (hKey)
{
LPCRYPTBLOCK pBlock = CreateCryptBlock(hKey, sqlite3BtreePager(db->aDb[nDb].pBt), NULL);
sqlite3PagerSetCodec(sqlite3BtreePager(db->aDb[nDb].pBt), sqlite3Codec, pBlock);
db->aDb[nDb].pAux = pBlock;
db->aDb[nDb].xFreeAux = DestroyCryptBlock;
rc = SQLITE_OK;
}
return rc;
}
// Once a password has been supplied and a key created, we don't keep the
................................................................................
LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)sqlite3pager_get_codecarg(p);
if (ppKey) *ppKey = 0;
if (pnKeyLen && pBlock) *pnKeyLen = 1;
}
// We do not attach this key to the temp store, only the main database.
int sqlite3_key(sqlite3 *db, const void *pKey, int nKeySize)
{
return sqlite3CodecAttach(db, 0, pKey, nKeySize);
}
// Changes the encryption key for an existing database.
int sqlite3_rekey(sqlite3 *db, const void *pKey, int nKeySize)
{
Btree *pbt = db->aDb[0].pBt;
Pager *p = sqlite3BtreePager(pbt);
LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)sqlite3pager_get_codecarg(p);
HCRYPTKEY hKey = DeriveKey(pKey, nKeySize);
int rc = SQLITE_ERROR;
................................................................................
if (!pBlock && !hKey) return SQLITE_OK; // Wasn't encrypted to begin with
// To rekey a database, we change the writekey for the pager. The readkey remains
// the same
if (!pBlock) // Encrypt an unencrypted database
{
pBlock = CreateCryptBlock(hKey, p, NULL);
if (!pBlock)
return SQLITE_NOMEM;
pBlock->hReadKey = 0; // Original database is not encrypted
sqlite3PagerSetCodec(sqlite3BtreePager(pbt), sqlite3Codec, pBlock);
db->aDb[0].pAux = pBlock;
db->aDb[0].xFreeAux = DestroyCryptBlock;
}
else // Change the writekey for an already-encrypted database
{
pBlock->hWriteKey = hKey;
}
// Start a transaction
................................................................................
pBlock->hWriteKey = pBlock->hReadKey;
}
// If the readkey and writekey are both empty, there's no need for a codec on this
// pager anymore. Destroy the crypt block and remove the codec from the pager.
if (!pBlock->hReadKey && !pBlock->hWriteKey)
{
sqlite3PagerSetCodec(p, NULL, NULL);
db->aDb[0].pAux = NULL;
db->aDb[0].xFreeAux = NULL;
DestroyCryptBlock(pBlock);
}
return rc;
}
#endif // SQLITE_HAS_CODEC
#endif // SQLITE_OMIT_DISKIO
|
| | > > > | | > > > > > > > > > | | | < > | < > | | < < > > > | | | | | | | | | | | | | | | |
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HCRYPTPROV g_hProvider = 0; // Global instance of the cryptographic provider
#define SQLITECRYPTERROR_PROVIDER "Cryptographic provider not available"
// Needed for re-keying
static void * sqlite3pager_get_codecarg(Pager *pPager)
{
return (pPager->xCodec) ? pPager->pCodec: NULL;
}
void sqlite3_activate_see(const char *info)
{
}
// Create a cryptographic context. Use the enhanced provider because it is available on
................................................................................
return TRUE;
}
// Create or update a cryptographic context for a pager.
// This function will automatically determine if the encryption algorithm requires
// extra padding, and if it does, will create a temp buffer big enough to provide
// space to hold it.
static LPCRYPTBLOCK CreateCryptBlock(HCRYPTKEY hKey, Pager *pager, int pageSize, LPCRYPTBLOCK pExisting)
{
LPCRYPTBLOCK pBlock;
if (!pExisting) // Creating a new cryptblock
{
pBlock = sqlite3_malloc(sizeof(CRYPTBLOCK));
if (!pBlock) return NULL;
................................................................................
pBlock->hWriteKey = hKey;
}
else // Updating an existing cryptblock
{
pBlock = pExisting;
}
if (pageSize == -1)
pageSize = pager->pageSize;
pBlock->pPager = pager;
pBlock->dwPageSize = (DWORD)pageSize;
pBlock->dwCryptSize = pBlock->dwPageSize;
// Existing cryptblocks may have a buffer, if so, delete it
if (pBlock->pvCrypt)
{
sqlite3_free(pBlock->pvCrypt);
pBlock->pvCrypt = NULL;
................................................................................
return NULL;
}
return pBlock;
}
// Destroy a cryptographic context and any buffers and keys allocated therein
static void sqlite3CodecFree(LPVOID pv)
{
LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)pv;
// Destroy the read key if there is one
if (pBlock->hReadKey)
{
CryptDestroyKey(pBlock->hReadKey);
}
// If there's a writekey and its not equal to the readkey, destroy it
................................................................................
{
sqlite3_free(pBlock->pvCrypt);
}
// All done with this cryptblock
sqlite3_free(pBlock);
}
void sqlite3CodecSizeChange(void *pArg, int pageSize, int reservedSize)
{
LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)pArg;
if (pBlock->dwPageSize != pageSize)
CreateCryptBlock(pBlock->hReadKey, pBlock->pPager, pageSize, pBlock);
}
// Encrypt/Decrypt functionality, called by pager.c
void * sqlite3Codec(void *pArg, void *data, Pgno nPageNum, int nMode)
{
LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)pArg;
DWORD dwPageSize;
LPVOID pvTemp;
if (!pBlock) return data;
//// Make sure the page size for the pager is still the same as the page size
//// for the cryptblock. If the user changed it, we need to adjust!
//if (nMode != 2)
//{
// if (pBlock->pPager->pageSize != pBlock->dwPageSize)
// {
// // Update the cryptblock to reflect the new page size
// CreateCryptBlock(pBlock->hReadKey, pBlock->pPager, pBlock);
// }
//}
switch(nMode)
{
case 0: // Undo a "case 7" journal file encryption
case 2: // Reload a page
case 3: // Load a page
if (!pBlock->hReadKey) break;
................................................................................
}
// Called by sqlite and sqlite3_key_interop to attach a key to a database.
int sqlite3CodecAttach(sqlite3 *db, int nDb, const void *pKey, int nKeyLen)
{
int rc = SQLITE_ERROR;
HCRYPTKEY hKey = 0;
Pager *p = sqlite3BtreePager(db->aDb[nDb].pBt);
// No key specified, could mean either use the main db's encryption or no encryption
if (!pKey || !nKeyLen)
{
if (!nDb)
{
return SQLITE_OK; // Main database, no key specified so not encrypted
}
else // Attached database, use the main database's key
{
// Get the encryption block for the main database and attempt to duplicate the key
// for use by the attached database
LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)sqlite3pager_get_codecarg(p);
if (!pBlock) return SQLITE_OK; // Main database is not encrypted so neither will be any attached database
if (!pBlock->hReadKey) return SQLITE_OK; // Not encrypted
if (!CryptDuplicateKey(pBlock->hReadKey, NULL, 0, &hKey))
return rc; // Unable to duplicate the key
}
................................................................................
return rc;
}
}
// Create a new encryption block and assign the codec to the new attached database
if (hKey)
{
LPCRYPTBLOCK pBlock = CreateCryptBlock(hKey, p, -1, NULL);
sqlite3PagerSetCodec(p, sqlite3Codec, sqlite3CodecSizeChange, sqlite3CodecFree, pBlock);
//db->aDb[nDb].pAux = pBlock;
//db->aDb[nDb].xFreeAux = DestroyCryptBlock;
rc = SQLITE_OK;
}
return rc;
}
// Once a password has been supplied and a key created, we don't keep the
................................................................................
LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)sqlite3pager_get_codecarg(p);
if (ppKey) *ppKey = 0;
if (pnKeyLen && pBlock) *pnKeyLen = 1;
}
// We do not attach this key to the temp store, only the main database.
int sqlite3_key(sqlite3 *db, const unsigned char *pKey, int nKeySize)
{
return sqlite3CodecAttach(db, 0, pKey, nKeySize);
}
// Changes the encryption key for an existing database.
int sqlite3_rekey(sqlite3 *db, const unsigned char *pKey, int nKeySize)
{
Btree *pbt = db->aDb[0].pBt;
Pager *p = sqlite3BtreePager(pbt);
LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)sqlite3pager_get_codecarg(p);
HCRYPTKEY hKey = DeriveKey(pKey, nKeySize);
int rc = SQLITE_ERROR;
................................................................................
if (!pBlock && !hKey) return SQLITE_OK; // Wasn't encrypted to begin with
// To rekey a database, we change the writekey for the pager. The readkey remains
// the same
if (!pBlock) // Encrypt an unencrypted database
{
pBlock = CreateCryptBlock(hKey, p, -1, NULL);
if (!pBlock)
return SQLITE_NOMEM;
pBlock->hReadKey = 0; // Original database is not encrypted
sqlite3PagerSetCodec(sqlite3BtreePager(pbt), sqlite3Codec, sqlite3CodecSizeChange, sqlite3CodecFree, pBlock);
//db->aDb[0].pAux = pBlock;
//db->aDb[0].xFreeAux = DestroyCryptBlock;
}
else // Change the writekey for an already-encrypted database
{
pBlock->hWriteKey = hKey;
}
// Start a transaction
................................................................................
pBlock->hWriteKey = pBlock->hReadKey;
}
// If the readkey and writekey are both empty, there's no need for a codec on this
// pager anymore. Destroy the crypt block and remove the codec from the pager.
if (!pBlock->hReadKey && !pBlock->hWriteKey)
{
sqlite3PagerSetCodec(p, NULL, NULL, NULL, NULL);
//db->aDb[0].pAux = NULL;
//db->aDb[0].xFreeAux = NULL;
sqlite3CodecFree(pBlock);
}
return rc;
}
#endif // SQLITE_HAS_CODEC
#endif // SQLITE_OMIT_DISKIO
|
Changes to SQLite.Interop/interop.c.
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#ifndef SQLITE_DEBUG #include "src/sqlite3.c" #else #include "splitsource\btreeint.h" #include "splitsource\vdbeint.h" #include "splitsource\sqliteInt.h" #endif #include "extension-functions.c" #include "crypt.c" #include <tchar.h> #ifdef NDEBUG #if _WIN32_WCE //#include "merge.h" #else #include "merge_full.h" #endif // _WIN32_WCE #endif // NDEBUG extern int RegisterExtensionFunctions(sqlite3 *db); #ifdef SQLITE_OS_WIN // Additional open flags, we use this one privately //#define SQLITE_OPEN_SHAREDCACHE 0x01000000 typedef void (*SQLITEUSERFUNC)(sqlite3_context *, int, sqlite3_value **); typedef void (*SQLITEFUNCFINAL)(sqlite3_context *); typedef HANDLE (WINAPI *CREATEFILEW)( LPCWSTR, DWORD, DWORD, LPSECURITY_ATTRIBUTES, DWORD, DWORD, HANDLE); int SetCompression(const wchar_t *pwszFilename, unsigned short ufLevel) { #ifdef FSCTL_SET_COMPRESSION HMODULE hMod = GetModuleHandle(_T("KERNEL32")); CREATEFILEW pfunc; HANDLE hFile; unsigned long dw = 0; int n; if (hMod == NULL) { SetLastError(ERROR_NOT_SUPPORTED); return 0; } pfunc = (CREATEFILEW)GetProcAddress(hMod, _T("CreateFileW")); if (pfunc == NULL) { SetLastError(ERROR_NOT_SUPPORTED); return 0; } hFile = pfunc(pwszFilename, GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (hFile == NULL) return 0; n = DeviceIoControl(hFile, FSCTL_SET_COMPRESSION, &ufLevel, sizeof(ufLevel), NULL, 0, &dw, NULL); CloseHandle(hFile); return n; #else SetLastError(ERROR_NOT_SUPPORTED); return 0; #endif } __declspec(dllexport) int WINAPI sqlite3_compressfile(const wchar_t *pwszFilename) { return SetCompression(pwszFilename, COMPRESSION_FORMAT_DEFAULT); } __declspec(dllexport) int WINAPI sqlite3_decompressfile(const wchar_t *pwszFilename) { return SetCompression(pwszFilename, COMPRESSION_FORMAT_NONE); } /* The goal of this version of close is different than that of sqlite3_close(), and is designed to lend itself better to .NET's non-deterministic finalizers and the GC thread. SQLite will not close a database if statements are open on it -- but for our purposes, we'd rather finalize all active statements and forcibly close the database. The reason is simple -- a lot of people don't Dispose() of their objects correctly and let the garbage collector do it. This leads to unexpected behavior when a user thinks they've closed a database, but it's still open because not all the statements have hit the GC yet. ................................................................................ if(pC->rowidIsValid) { *prowid = pC->lastRowid; } else if(pC->pseudoTable) { *prowid = keyToInt(pC->iKey); } else if(pC->nullRow || pC->pCursor==0) { ret = SQLITE_ERROR; break; } else ................................................................................ { if (pC->pCursor == NULL) { ret = SQLITE_ERROR; break; } sqlite3BtreeKeySize(pC->pCursor, prowid); *prowid = keyToInt(*prowid); } break; } sqlite3_mutex_leave(db->mutex); return ret; } #endif // SQLITE_OS_WIN |
< < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | | |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 ... 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 ... 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 |
#include "src/sqlite3.c"
#include "extension-functions.c"
#include "crypt.c"
extern int RegisterExtensionFunctions(sqlite3 *db);
#ifdef SQLITE_OS_WIN
// Additional open flags, we use this one privately
//#define SQLITE_OPEN_SHAREDCACHE 0x01000000
typedef void (*SQLITEUSERFUNC)(sqlite3_context *, int, sqlite3_value **);
typedef void (*SQLITEFUNCFINAL)(sqlite3_context *);
/*
The goal of this version of close is different than that of sqlite3_close(), and is designed to lend itself better to .NET's non-deterministic finalizers and
the GC thread. SQLite will not close a database if statements are open on it -- but for our purposes, we'd rather finalize all active statements
and forcibly close the database. The reason is simple -- a lot of people don't Dispose() of their objects correctly and let the garbage collector
do it. This leads to unexpected behavior when a user thinks they've closed a database, but it's still open because not all the statements have
hit the GC yet.
................................................................................
if(pC->rowidIsValid)
{
*prowid = pC->lastRowid;
}
else if(pC->pseudoTable)
{
*prowid = pC->iKey;
}
else if(pC->nullRow || pC->pCursor==0)
{
ret = SQLITE_ERROR;
break;
}
else
................................................................................
{
if (pC->pCursor == NULL)
{
ret = SQLITE_ERROR;
break;
}
sqlite3BtreeKeySize(pC->pCursor, prowid);
*prowid = *prowid;
}
break;
}
sqlite3_mutex_leave(db->mutex);
return ret;
}
#endif // SQLITE_OS_WIN
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Changes to SQLite.Interop/src/sqlite3.c.
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/****************************************************************************** ** This file is an amalgamation of many separate C source files from SQLite ** version 3.6.15. By combining all the individual C code files into this ** single large file, the entire code can be compiled as a one translation ** unit. This allows many compilers to do optimizations that would not be ** possible if the files were compiled separately. Performance improvements ** of 5% are more are commonly seen when SQLite is compiled as a single ** translation unit. ** ** This file is all you need to compile SQLite. To use SQLite in other ** programs, you need this file and the "sqlite3.h" header file that defines ** the programming interface to the SQLite library. (If you do not have ** the "sqlite3.h" header file at hand, you will find a copy in the first ** 5615 lines past this header comment.) Additional code files may be ** needed if you want a wrapper to interface SQLite with your choice of ** programming language. The code for the "sqlite3" command-line shell ** is also in a separate file. This file contains only code for the core ** SQLite library. ** ** This amalgamation was generated on 2009-06-15 00:07:42 UTC. */ #define SQLITE_CORE 1 #define SQLITE_AMALGAMATION 1 #ifndef SQLITE_PRIVATE # define SQLITE_PRIVATE static #endif #ifndef SQLITE_API ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** Internal interface definitions for SQLite. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _SQLITEINT_H_ #define _SQLITEINT_H_ /* ** Include the configuration header output by 'configure' if we're using the ** autoconf-based build ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file defines various limits of what SQLite can process. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** The maximum length of a TEXT or BLOB in bytes. This also ** limits the size of a row in a table or index. ** ** The hard limit is the ability of a 32-bit signed integer ................................................................................ ** be true and false so that the unreachable code then specify will ** not be counted as untested code. */ #if defined(SQLITE_COVERAGE_TEST) # define ALWAYS(X) (1) # define NEVER(X) (0) #elif !defined(NDEBUG) SQLITE_PRIVATE int sqlite3Assert(void); # define ALWAYS(X) ((X)?1:sqlite3Assert()) # define NEVER(X) ((X)?sqlite3Assert():0) #else # define ALWAYS(X) (X) # define NEVER(X) (X) #endif /* ** The macro unlikely() is a hint that surrounds a boolean ................................................................................ ** on how SQLite interfaces are suppose to operate. ** ** The name of this file under configuration management is "sqlite.h.in". ** The makefile makes some minor changes to this file (such as inserting ** the version number) and changes its name to "sqlite3.h" as ** part of the build process. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _SQLITE3_H_ #define _SQLITE3_H_ #include <stdarg.h> /* Needed for the definition of va_list */ /* ** Make sure we can call this stuff from C++. ................................................................................ ** The Z value is the release number and is incremented with ** each release but resets back to 0 whenever Y is incremented. ** ** See also: [sqlite3_libversion()] and [sqlite3_libversion_number()]. ** ** Requirements: [H10011] [H10014] */ #define SQLITE_VERSION "3.6.15" #define SQLITE_VERSION_NUMBER 3006015 /* ** CAPI3REF: Run-Time Library Version Numbers {H10020} <S60100> ** KEYWORDS: sqlite3_version ** ** These features provide the same information as the [SQLITE_VERSION] ** and [SQLITE_VERSION_NUMBER] #defines in the header, but are associated ................................................................................ ** ** Every file opened by the [sqlite3_vfs] xOpen method populates an ** [sqlite3_file] object (or, more commonly, a subclass of the ** [sqlite3_file] object) with a pointer to an instance of this object. ** This object defines the methods used to perform various operations ** against the open file represented by the [sqlite3_file] object. ** ** The flags argument to xSync may be one of [SQLITE_SYNC_NORMAL] or ** [SQLITE_SYNC_FULL]. The first choice is the normal fsync(). ** The second choice is a Mac OS X style fullsync. The [SQLITE_SYNC_DATAONLY] ** flag may be ORed in to indicate that only the data of the file ** and not its inode needs to be synced. ** ** The integer values to xLock() and xUnlock() are one of ................................................................................ ** The zName field holds the name of the VFS module. The name must ** be unique across all VFS modules. ** ** SQLite will guarantee that the zFilename parameter to xOpen ** is either a NULL pointer or string obtained ** from xFullPathname(). SQLite further guarantees that ** the string will be valid and unchanged until xClose() is ** called. Because of the previous sentense, ** the [sqlite3_file] can safely store a pointer to the ** filename if it needs to remember the filename for some reason. ** If the zFilename parameter is xOpen is a NULL pointer then xOpen ** must invite its own temporary name for the file. Whenever the ** xFilename parameter is NULL it will also be the case that the ** flags parameter will include [SQLITE_OPEN_DELETEONCLOSE]. ** ** The flags argument to xOpen() includes all bits set in ** the flags argument to [sqlite3_open_v2()]. Or if [sqlite3_open()] ** or [sqlite3_open16()] is used, then flags includes at least ** [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]. ................................................................................ ** be created, and that it is an error if it already exists. ** It is <i>not</i> used to indicate the file should be opened ** for exclusive access. ** ** At least szOsFile bytes of memory are allocated by SQLite ** to hold the [sqlite3_file] structure passed as the third ** argument to xOpen. The xOpen method does not have to ** allocate the structure; it should just fill it in. ** ** The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS] ** to test for the existence of a file, or [SQLITE_ACCESS_READWRITE] to ** test whether a file is readable and writable, or [SQLITE_ACCESS_READ] ** to test whether a file is at least readable. The file can be a ** directory. ** ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This is the header file for the generic hash-table implemenation ** used in SQLite. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _SQLITE_HASH_H_ #define _SQLITE_HASH_H_ /* Forward declarations of structures. */ typedef struct Hash Hash; typedef struct HashElem HashElem; ................................................................................ ** If compiling for a processor that lacks floating point support, ** substitute integer for floating-point */ #ifdef SQLITE_OMIT_FLOATING_POINT # define double sqlite_int64 # define LONGDOUBLE_TYPE sqlite_int64 # ifndef SQLITE_BIG_DBL # define SQLITE_BIG_DBL (0x7fffffffffffffff) # endif # define SQLITE_OMIT_DATETIME_FUNCS 1 # define SQLITE_OMIT_TRACE 1 # undef SQLITE_MIXED_ENDIAN_64BIT_FLOAT #endif #ifndef SQLITE_BIG_DBL # define SQLITE_BIG_DBL (1e99) #endif /* ** OMIT_TEMPDB is set to 1 if SQLITE_OMIT_TEMPDB is defined, or 0 ................................................................................ #define UNUSED_PARAMETER2(x,y) UNUSED_PARAMETER(x),UNUSED_PARAMETER(y) /* ** Forward references to structures */ typedef struct AggInfo AggInfo; typedef struct AuthContext AuthContext; typedef struct Bitvec Bitvec; typedef struct RowSet RowSet; typedef struct CollSeq CollSeq; typedef struct Column Column; typedef struct Db Db; typedef struct Schema Schema; typedef struct Expr Expr; ................................................................................ ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the sqlite B-Tree file ** subsystem. See comments in the source code for a detailed description ** of what each interface routine does. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _BTREE_H_ #define _BTREE_H_ /* TODO: This definition is just included so other modules compile. It ** needs to be revisited. */ ................................................................................ ************************************************************************* ** Header file for the Virtual DataBase Engine (VDBE) ** ** This header defines the interface to the virtual database engine ** or VDBE. The VDBE implements an abstract machine that runs a ** simple program to access and modify the underlying database. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _SQLITE_VDBE_H_ #define _SQLITE_VDBE_H_ /* ** A single VDBE is an opaque structure named "Vdbe". Only routines ** in the source file sqliteVdbe.c are allowed to see the insides ................................................................................ ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the sqlite page cache ** subsystem. The page cache subsystem reads and writes a file a page ** at a time and provides a journal for rollback. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _PAGER_H_ #define _PAGER_H_ /* ** Default maximum size for persistent journal files. A negative ................................................................................ SQLITE_PRIVATE int sqlite3PagerOpen(sqlite3_vfs *, Pager **ppPager, const char*, int,int,int); SQLITE_PRIVATE int sqlite3PagerClose(Pager *pPager); SQLITE_PRIVATE int sqlite3PagerReadFileheader(Pager*, int, unsigned char*); /* Functions used to configure a Pager object. */ SQLITE_PRIVATE void sqlite3PagerSetBusyhandler(Pager*, int(*)(void *), void *); SQLITE_PRIVATE void sqlite3PagerSetReiniter(Pager*, void(*)(DbPage*)); SQLITE_PRIVATE int sqlite3PagerSetPagesize(Pager*, u16*); SQLITE_PRIVATE int sqlite3PagerMaxPageCount(Pager*, int); SQLITE_PRIVATE void sqlite3PagerSetCachesize(Pager*, int); SQLITE_PRIVATE void sqlite3PagerSetSafetyLevel(Pager*,int,int); SQLITE_PRIVATE int sqlite3PagerLockingMode(Pager *, int); SQLITE_PRIVATE int sqlite3PagerJournalMode(Pager *, int); SQLITE_PRIVATE i64 sqlite3PagerJournalSizeLimit(Pager *, i64); SQLITE_PRIVATE sqlite3_backup **sqlite3PagerBackupPtr(Pager*); ................................................................................ SQLITE_PRIVATE int sqlite3PagerNosync(Pager*); SQLITE_PRIVATE void *sqlite3PagerTempSpace(Pager*); SQLITE_PRIVATE int sqlite3PagerIsMemdb(Pager*); /* Functions used to truncate the database file. */ SQLITE_PRIVATE void sqlite3PagerTruncateImage(Pager*,Pgno); /* Used by encryption extensions. */ #ifdef SQLITE_HAS_CODEC SQLITE_PRIVATE void sqlite3PagerSetCodec(Pager*,void*(*)(void*,void*,Pgno,int),void*); #endif /* Functions to support testing and debugging. */ #if !defined(NDEBUG) || defined(SQLITE_TEST) SQLITE_PRIVATE Pgno sqlite3PagerPagenumber(DbPage*); SQLITE_PRIVATE int sqlite3PagerIswriteable(DbPage*); #endif #ifdef SQLITE_TEST SQLITE_PRIVATE int *sqlite3PagerStats(Pager*); ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the sqlite page cache ** subsystem. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _PCACHE_H_ typedef struct PgHdr PgHdr; typedef struct PCache PCache; ................................................................................ ** This header file (together with is companion C source-code file ** "os.c") attempt to abstract the underlying operating system so that ** the SQLite library will work on both POSIX and windows systems. ** ** This header file is #include-ed by sqliteInt.h and thus ends up ** being included by every source file. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _SQLITE_OS_H_ #define _SQLITE_OS_H_ /* ** Figure out if we are dealing with Unix, Windows, or some other ** operating system. After the following block of preprocess macros, ................................................................................ ** to all source files. We break it out in an effort to keep the code ** better organized. ** ** NOTE: source files should *not* #include this header file directly. ** Source files should #include the sqliteInt.h file and let that file ** include this one indirectly. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Figure out what version of the code to use. The choices are ** ** SQLITE_MUTEX_OMIT No mutex logic. Not even stubs. The ................................................................................ */ struct Db { char *zName; /* Name of this database */ Btree *pBt; /* The B*Tree structure for this database file */ u8 inTrans; /* 0: not writable. 1: Transaction. 2: Checkpoint */ u8 safety_level; /* How aggressive at syncing data to disk */ Schema *pSchema; /* Pointer to database schema (possibly shared) */ #ifdef SQLITE_HAS_CODEC void *pAux; /* Auxiliary data. Usually NULL */ void (*xFreeAux)(void*); /* Routine to free pAux */ #endif }; /* ** An instance of the following structure stores a database schema. ** ** If there are no virtual tables configured in this schema, the ** Schema.db variable is set to NULL. After the first virtual table ................................................................................ u8 dfltLockMode; /* Default locking-mode for attached dbs */ u8 dfltJournalMode; /* Default journal mode for attached dbs */ signed char nextAutovac; /* Autovac setting after VACUUM if >=0 */ int nextPagesize; /* Pagesize after VACUUM if >0 */ int nTable; /* Number of tables in the database */ CollSeq *pDfltColl; /* The default collating sequence (BINARY) */ i64 lastRowid; /* ROWID of most recent insert (see above) */ i64 priorNewRowid; /* Last randomly generated ROWID */ u32 magic; /* Magic number for detect library misuse */ int nChange; /* Value returned by sqlite3_changes() */ int nTotalChange; /* Value returned by sqlite3_total_changes() */ sqlite3_mutex *mutex; /* Connection mutex */ int aLimit[SQLITE_N_LIMIT]; /* Limits */ struct sqlite3InitInfo { /* Information used during initialization */ int iDb; /* When back is being initialized */ ................................................................................ int nVTrans; /* Allocated size of aVTrans */ #endif FuncDefHash aFunc; /* Hash table of connection functions */ Hash aCollSeq; /* All collating sequences */ BusyHandler busyHandler; /* Busy callback */ int busyTimeout; /* Busy handler timeout, in msec */ Db aDbStatic[2]; /* Static space for the 2 default backends */ #ifdef SQLITE_SSE sqlite3_stmt *pFetch; /* Used by SSE to fetch stored statements */ #endif Savepoint *pSavepoint; /* List of active savepoints */ int nSavepoint; /* Number of non-transaction savepoints */ int nStatement; /* Number of nested statement-transactions */ u8 isTransactionSavepoint; /* True if the outermost savepoint is a TS */ #ifdef SQLITE_ENABLE_UNLOCK_NOTIFY /* The following variables are all protected by the STATIC_MASTER ................................................................................ u8 eDest; /* How to dispose of the results */ u8 affinity; /* Affinity used when eDest==SRT_Set */ int iParm; /* A parameter used by the eDest disposal method */ int iMem; /* Base register where results are written */ int nMem; /* Number of registers allocated */ }; /* ** Size of the column cache */ #ifndef SQLITE_N_COLCACHE # define SQLITE_N_COLCACHE 10 #endif ................................................................................ int cookieValue[SQLITE_MAX_ATTACHED+2]; /* Values of cookies to verify */ #ifndef SQLITE_OMIT_SHARED_CACHE int nTableLock; /* Number of locks in aTableLock */ TableLock *aTableLock; /* Required table locks for shared-cache mode */ #endif int regRowid; /* Register holding rowid of CREATE TABLE entry */ int regRoot; /* Register holding root page number for new objects */ /* Above is constant between recursions. Below is reset before and after ** each recursion */ int nVar; /* Number of '?' variables seen in the SQL so far */ int nVarExpr; /* Number of used slots in apVarExpr[] */ int nVarExprAlloc; /* Number of allocated slots in apVarExpr[] */ ................................................................................ SQLITE_PRIVATE int sqlite3ViewGetColumnNames(Parse*,Table*); #else # define sqlite3ViewGetColumnNames(A,B) 0 #endif SQLITE_PRIVATE void sqlite3DropTable(Parse*, SrcList*, int, int); SQLITE_PRIVATE void sqlite3DeleteTable(Table*); SQLITE_PRIVATE void sqlite3Insert(Parse*, SrcList*, ExprList*, Select*, IdList*, int); SQLITE_PRIVATE void *sqlite3ArrayAllocate(sqlite3*,void*,int,int,int*,int*,int*); SQLITE_PRIVATE IdList *sqlite3IdListAppend(sqlite3*, IdList*, Token*); SQLITE_PRIVATE int sqlite3IdListIndex(IdList*,const char*); SQLITE_PRIVATE SrcList *sqlite3SrcListEnlarge(sqlite3*, SrcList*, int, int); SQLITE_PRIVATE SrcList *sqlite3SrcListAppend(sqlite3*, SrcList*, Token*, Token*); SQLITE_PRIVATE SrcList *sqlite3SrcListAppendFromTerm(Parse*, SrcList*, Token*, Token*, ................................................................................ SQLITE_PRIVATE void sqlite3ConnectionClosed(sqlite3 *db); #else #define sqlite3ConnectionBlocked(x,y) #define sqlite3ConnectionUnlocked(x) #define sqlite3ConnectionClosed(x) #endif #ifdef SQLITE_SSE #include "sseInt.h" #endif #ifdef SQLITE_DEBUG SQLITE_PRIVATE void sqlite3ParserTrace(FILE*, char *); #endif /* ** If the SQLITE_ENABLE IOTRACE exists then the global variable ** sqlite3IoTrace is a pointer to a printf-like routine used to ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file contains definitions of global variables and contants. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* An array to map all upper-case characters into their corresponding ** lower-case character. ** ** SQLite only considers US-ASCII (or EBCDIC) characters. We do not ................................................................................ ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This module implements the sqlite3_status() interface and related ** functionality. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Variables in which to record status information. */ typedef struct sqlite3StatType sqlite3StatType; static SQLITE_WSD struct sqlite3StatType { ................................................................................ ** This file contains the C functions that implement date and time ** functions for SQLite. ** ** There is only one exported symbol in this file - the function ** sqlite3RegisterDateTimeFunctions() found at the bottom of the file. ** All other code has file scope. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ ** ** SQLite processes all times and dates as Julian Day numbers. The ** dates and times are stored as the number of days since noon ** in Greenwich on November 24, 4714 B.C. according to the Gregorian ** calendar system. ** ** 1970-01-01 00:00:00 is JD 2440587.5 ................................................................................ ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains OS interface code that is common to all ** architectures. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #define _SQLITE_OS_C_ 1 #undef _SQLITE_OS_C_ /* ** The default SQLite sqlite3_vfs implementations do not allocate ** memory (actually, os_unix.c allocates a small amount of memory ................................................................................ ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** This file contains code to support the concept of "benign" ** malloc failures (when the xMalloc() or xRealloc() method of the ** sqlite3_mem_methods structure fails to allocate a block of memory ** and returns 0). ................................................................................ ** ** This file contains a no-op memory allocation drivers for use when ** SQLITE_ZERO_MALLOC is defined. The allocation drivers implemented ** here always fail. SQLite will not operate with these drivers. These ** are merely placeholders. Real drivers must be substituted using ** sqlite3_config() before SQLite will operate. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** This version of the memory allocator is the default. It is ** used when no other memory allocator is specified using compile-time ** macros. */ ................................................................................ ** This file contains low-level memory allocation drivers for when ** SQLite will use the standard C-library malloc/realloc/free interface ** to obtain the memory it needs. ** ** This file contains implementations of the low-level memory allocation ** routines specified in the sqlite3_mem_methods object. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** This version of the memory allocator is the default. It is ** used when no other memory allocator is specified using compile-time ** macros. */ ................................................................................ ** to obtain the memory it needs while adding lots of additional debugging ** information to each allocation in order to help detect and fix memory ** leaks and memory usage errors. ** ** This file contains implementations of the low-level memory allocation ** routines specified in the sqlite3_mem_methods object. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** This version of the memory allocator is used only if the ** SQLITE_MEMDEBUG macro is defined */ #ifdef SQLITE_MEMDEBUG ................................................................................ ** implementations. Once sqlite3_initialize() has been called, ** the amount of memory available to SQLite is fixed and cannot ** be changed. ** ** This version of the memory allocation subsystem is included ** in the build only if SQLITE_ENABLE_MEMSYS3 is defined. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** This version of the memory allocator is only built into the library ** SQLITE_ENABLE_MEMSYS3 is defined. Defining this symbol does not ** mean that the library will use a memory-pool by default, just that ** it is available. The mempool allocator is activated by calling ................................................................................ ** implementations. Once sqlite3_initialize() has been called, ** the amount of memory available to SQLite is fixed and cannot ** be changed. ** ** This version of the memory allocation subsystem is included ** in the build only if SQLITE_ENABLE_MEMSYS5 is defined. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** This version of the memory allocator is used only when ** SQLITE_ENABLE_MEMSYS5 is defined. */ #ifdef SQLITE_ENABLE_MEMSYS5 ................................................................................ ** ************************************************************************* ** This file contains the C functions that implement mutexes. ** ** This file contains code that is common across all mutex implementations. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef SQLITE_MUTEX_OMIT /* ** Initialize the mutex system. */ SQLITE_PRIVATE int sqlite3MutexInit(void){ ................................................................................ ** ** interface. ** ** If compiled with SQLITE_DEBUG, then additional logic is inserted ** that does error checking on mutexes to make sure they are being ** called correctly. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #if defined(SQLITE_MUTEX_NOOP) && !defined(SQLITE_DEBUG) /* ** Stub routines for all mutex methods. ** ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains the C functions that implement mutexes for OS/2 ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** The code in this file is only used if SQLITE_MUTEX_OS2 is defined. ** See the mutex.h file for details. */ #ifdef SQLITE_MUTEX_OS2 ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains the C functions that implement mutexes for pthreads ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** The code in this file is only used if we are compiling threadsafe ** under unix with pthreads. ** ** Note that this implementation requires a version of pthreads that ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains the C functions that implement mutexes for win32 ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** The code in this file is only used if we are compiling multithreaded ** on a win32 system. */ #ifdef SQLITE_MUTEX_W32 ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** Memory allocation functions used throughout sqlite. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** This routine runs when the memory allocator sees that the ** total memory allocation is about to exceed the soft heap ** limit. */ ................................................................................ /* ** Allocate memory. This routine is like sqlite3_malloc() except that it ** assumes the memory subsystem has already been initialized. */ SQLITE_PRIVATE void *sqlite3Malloc(int n){ void *p; if( n<=0 || NEVER(n>=0x7fffff00) ){ /* The NEVER(n>=0x7fffff00) term is added out of paranoia. We want to make ** absolutely sure that there is nothing within SQLite that can cause a ** memory allocation of a number of bytes which is near the maximum signed ** integer value and thus cause an integer overflow inside of the xMalloc() ** implementation. The n>=0x7fffff00 gives us 255 bytes of headroom. The ** test should never be true because SQLITE_MAX_LENGTH should be much ** less than 0x7fffff00 and it should catch large memory allocations ** before they reach this point. */ p = 0; }else if( sqlite3GlobalConfig.bMemstat ){ sqlite3_mutex_enter(mem0.mutex); mallocWithAlarm(n, &p); sqlite3_mutex_leave(mem0.mutex); }else{ p = sqlite3GlobalConfig.m.xMalloc(n); ................................................................................ */ SQLITE_PRIVATE void *sqlite3Realloc(void *pOld, int nBytes){ int nOld, nNew; void *pNew; if( pOld==0 ){ return sqlite3Malloc(nBytes); } if( nBytes<=0 || NEVER(nBytes>=0x7fffff00) ){ /* The NEVER(...) term is explained in comments on sqlite3Malloc() */ sqlite3_free(pOld); return 0; } nOld = sqlite3MallocSize(pOld); if( sqlite3GlobalConfig.bMemstat ){ sqlite3_mutex_enter(mem0.mutex); sqlite3StatusSet(SQLITE_STATUS_MALLOC_SIZE, nBytes); nNew = sqlite3GlobalConfig.m.xRoundup(nBytes); if( nOld==nNew ){ ................................................................................ /* ** The "printf" code that follows dates from the 1980's. It is in ** the public domain. The original comments are included here for ** completeness. They are very out-of-date but might be useful as ** an historical reference. Most of the "enhancements" have been backed ** out so that the functionality is now the same as standard printf(). ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ ** ************************************************************************** ** ** The following modules is an enhanced replacement for the "printf" subroutines ** found in the standard C library. The following enhancements are ** supported: ** ................................................................................ ************************************************************************* ** This file contains code to implement a pseudo-random number ** generator (PRNG) for SQLite. ** ** Random numbers are used by some of the database backends in order ** to generate random integer keys for tables or random filenames. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* All threads share a single random number generator. ** This structure is the current state of the generator. */ static SQLITE_WSD struct sqlite3PrngType { ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains routines used to translate between UTF-8, ** UTF-16, UTF-16BE, and UTF-16LE. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ ** ** Notes on UTF-8: ** ** Byte-0 Byte-1 Byte-2 Byte-3 Value ** 0xxxxxxx 00000000 00000000 0xxxxxxx ** 110yyyyy 10xxxxxx 00000000 00000yyy yyxxxxxx ** 1110zzzz 10yyyyyy 10xxxxxx 00000000 zzzzyyyy yyxxxxxx ................................................................................ ************************************************************************* ** This is the header file for information that is private to the ** VDBE. This information used to all be at the top of the single ** source code file "vdbe.c". When that file became too big (over ** 6000 lines long) it was split up into several smaller files and ** this header information was factored out. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _VDBEINT_H_ #define _VDBEINT_H_ /* ** intToKey() and keyToInt() used to transform the rowid. But with ** the latest versions of the design they are no-ops. */ #define keyToInt(X) (X) #define intToKey(X) (X) /* ** SQL is translated into a sequence of instructions to be ** executed by a virtual machine. Each instruction is an instance ** of the following structure. */ typedef struct VdbeOp Op; ................................................................................ ** set to 2 for xDestroy method calls and 1 for all other methods. This ** variable is used for two purposes: to allow xDestroy methods to execute ** "DROP TABLE" statements and to prevent some nasty side effects of ** malloc failure when SQLite is invoked recursively by a virtual table ** method function. */ struct Vdbe { sqlite3 *db; /* The whole database */ Vdbe *pPrev,*pNext; /* Linked list of VDBEs with the same Vdbe.db */ int nOp; /* Number of instructions in the program */ int nOpAlloc; /* Number of slots allocated for aOp[] */ Op *aOp; /* Space to hold the virtual machine's program */ int nLabel; /* Number of labels used */ int nLabelAlloc; /* Number of slots allocated in aLabel[] */ int *aLabel; /* Space to hold the labels */ Mem **apArg; /* Arguments to currently executing user function */ Mem *aColName; /* Column names to return */ int nCursor; /* Number of slots in apCsr[] */ VdbeCursor **apCsr; /* One element of this array for each open cursor */ int nVar; /* Number of entries in aVar[] */ Mem *aVar; /* Values for the OP_Variable opcode. */ char **azVar; /* Name of variables */ int okVar; /* True if azVar[] has been initialized */ u32 magic; /* Magic number for sanity checking */ int nMem; /* Number of memory locations currently allocated */ Mem *aMem; /* The memory locations */ int cacheCtr; /* VdbeCursor row cache generation counter */ int contextStackTop; /* Index of top element in the context stack */ int contextStackDepth; /* The size of the "context" stack */ Context *contextStack; /* Stack used by opcodes ContextPush & ContextPop*/ int pc; /* The program counter */ int rc; /* Value to return */ int errorAction; /* Recovery action to do in case of an error */ int nResColumn; /* Number of columns in one row of the result set */ char **azResColumn; /* Values for one row of result */ char *zErrMsg; /* Error message written here */ Mem *pResultSet; /* Pointer to an array of results */ u8 explain; /* True if EXPLAIN present on SQL command */ u8 changeCntOn; /* True to update the change-counter */ u8 expired; /* True if the VM needs to be recompiled */ u8 minWriteFileFormat; /* Minimum file format for writable database files */ u8 inVtabMethod; /* See comments above */ u8 usesStmtJournal; /* True if uses a statement journal */ u8 readOnly; /* True for read-only statements */ u8 isPrepareV2; /* True if prepared with prepare_v2() */ int nChange; /* Number of db changes made since last reset */ i64 startTime; /* Time when query started - used for profiling */ int btreeMask; /* Bitmask of db->aDb[] entries referenced */ BtreeMutexArray aMutex; /* An array of Btree used here and needing locks */ int aCounter[2]; /* Counters used by sqlite3_stmt_status() */ char *zSql; /* Text of the SQL statement that generated this */ void *pFree; /* Free this when deleting the vdbe */ #ifdef SQLITE_DEBUG FILE *trace; /* Write an execution trace here, if not NULL */ #endif int iStatement; /* Statement number (or 0 if has not opened stmt) */ #ifdef SQLITE_SSE int fetchId; /* Statement number used by sqlite3_fetch_statement */ int lru; /* Counter used for LRU cache replacement */ #endif #ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT Vdbe *pLruPrev; Vdbe *pLruNext; #endif }; /* ** The following are allowed values for Vdbe.magic */ #define VDBE_MAGIC_INIT 0x26bceaa5 /* Building a VDBE program */ ................................................................................ SQLITE_PRIVATE u32 sqlite3VdbeSerialType(Mem*, int); SQLITE_PRIVATE u32 sqlite3VdbeSerialPut(unsigned char*, int, Mem*, int); SQLITE_PRIVATE u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*); SQLITE_PRIVATE void sqlite3VdbeDeleteAuxData(VdbeFunc*, int); int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *); SQLITE_PRIVATE int sqlite3VdbeIdxKeyCompare(VdbeCursor*,UnpackedRecord*,int*); SQLITE_PRIVATE int sqlite3VdbeIdxRowid(BtCursor *, i64 *); SQLITE_PRIVATE int sqlite3MemCompare(const Mem*, const Mem*, const CollSeq*); SQLITE_PRIVATE int sqlite3VdbeExec(Vdbe*); SQLITE_PRIVATE int sqlite3VdbeList(Vdbe*); SQLITE_PRIVATE int sqlite3VdbeHalt(Vdbe*); SQLITE_PRIVATE int sqlite3VdbeChangeEncoding(Mem *, int); SQLITE_PRIVATE int sqlite3VdbeMemTooBig(Mem*); SQLITE_PRIVATE int sqlite3VdbeMemCopy(Mem*, const Mem*); ................................................................................ ** ************************************************************************* ** Utility functions used throughout sqlite. ** ** This file contains functions for allocating memory, comparing ** strings, and stuff like that. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifdef SQLITE_HAVE_ISNAN # include <math.h> #endif /* ** Routine needed to support the testcase() macro. */ #ifdef SQLITE_COVERAGE_TEST SQLITE_PRIVATE void sqlite3Coverage(int x){ static int dummy = 0; dummy += x; } #endif /* ** Routine needed to support the ALWAYS() and NEVER() macros. ** ** The argument to ALWAYS() should always be true and the argument ** to NEVER() should always be false. If either is not the case ** then this routine is called in order to throw an error. ** ** This routine only exists if assert() is operational. It always ** throws an assert on its first invocation. The variable has a long ** name to help the assert() message be more readable. The variable ** is used to prevent a too-clever optimizer from optimizing out the ** entire call. */ #ifndef NDEBUG SQLITE_PRIVATE int sqlite3Assert(void){ static volatile int ALWAYS_was_false_or_NEVER_was_true = 0; assert( ALWAYS_was_false_or_NEVER_was_true ); /* Always fails */ return ALWAYS_was_false_or_NEVER_was_true++; /* Not Reached */ } #endif /* ** Return true if the floating point value is Not a Number (NaN). ** ** Use the math library isnan() function if compiled with SQLITE_HAVE_ISNAN. ** Otherwise, we have our own implementation that works on most systems. ................................................................................ ** ** compare2pow63("9223372036854775800") ** ** will return -8. */ static int compare2pow63(const char *zNum){ int c; c = memcmp(zNum,"922337203685477580",18); if( c==0 ){ c = zNum[18] - '8'; } return c; } ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This is the implementation of generic hash-tables ** used in SQLite. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* Turn bulk memory into a hash table object by initializing the ** fields of the Hash structure. ** ** "pNew" is a pointer to the hash table that is to be initialized. */ ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains code that is specific to OS/2. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #if SQLITE_OS_OS2 /* ** A Note About Memory Allocation: ................................................................................ ** This file contains macros and a little bit of code that is common to ** all of the platform-specific files (os_*.c) and is #included into those ** files. ** ** This file should be #included by the os_*.c files only. It is not a ** general purpose header file. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _OS_COMMON_H_ #define _OS_COMMON_H_ /* ** At least two bugs have slipped in because we changed the MEMORY_DEBUG ** macro to SQLITE_DEBUG and some older makefiles have not yet made the ................................................................................ ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains inline asm code for retrieving "high-performance" ** counters for x86 class CPUs. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _HWTIME_H_ #define _HWTIME_H_ /* ** The following routine only works on pentium-class (or newer) processors. ** It uses the RDTSC opcode to read the cycle count value out of the ................................................................................ ** * Definitions of sqlite3_io_methods objects for all locking ** methods plus "finder" functions for each locking method. ** * sqlite3_vfs method implementations. ** * Locking primitives for the proxy uber-locking-method. (MacOSX only) ** * Definitions of sqlite3_vfs objects for all locking methods ** plus implementations of sqlite3_os_init() and sqlite3_os_end(). ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #if SQLITE_OS_UNIX /* This file is used on unix only */ /* ** There are various methods for file locking used for concurrency ** control: ** ................................................................................ ** This file contains macros and a little bit of code that is common to ** all of the platform-specific files (os_*.c) and is #included into those ** files. ** ** This file should be #included by the os_*.c files only. It is not a ** general purpose header file. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _OS_COMMON_H_ #define _OS_COMMON_H_ /* ** At least two bugs have slipped in because we changed the MEMORY_DEBUG ** macro to SQLITE_DEBUG and some older makefiles have not yet made the ................................................................................ ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains inline asm code for retrieving "high-performance" ** counters for x86 class CPUs. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _HWTIME_H_ #define _HWTIME_H_ /* ** The following routine only works on pentium-class (or newer) processors. ** It uses the RDTSC opcode to read the cycle count value out of the ................................................................................ struct unixOpenCnt **ppOpen /* Return the unixOpenCnt structure here */ ){ int rc; /* System call return code */ int fd; /* The file descriptor for pFile */ struct unixLockKey lockKey; /* Lookup key for the unixLockInfo structure */ struct unixFileId fileId; /* Lookup key for the unixOpenCnt struct */ struct stat statbuf; /* Low-level file information */ struct unixLockInfo *pLock; /* Candidate unixLockInfo object */ struct unixOpenCnt *pOpen; /* Candidate unixOpenCnt object */ /* Get low-level information about the file that we can used to ** create a unique name for the file. */ fd = pFile->h; rc = fstat(fd, &statbuf); ................................................................................ pFile->locktype = SHARED_LOCK; return SQLITE_OK; } /* To fully unlock the database, delete the lock file */ assert( locktype==NO_LOCK ); if( unlink(zLockFile) ){ int rc, tErrno = errno; if( ENOENT != tErrno ){ rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK); } if( IS_LOCK_ERROR(rc) ){ pFile->lastErrno = tErrno; } return rc; ................................................................................ /* ** Find the current time (in Universal Coordinated Time). Write the ** current time and date as a Julian Day number into *prNow and ** return 0. Return 1 if the time and date cannot be found. */ static int unixCurrentTime(sqlite3_vfs *NotUsed, double *prNow){ #if defined(NO_GETTOD) time_t t; time(&t); *prNow = t/86400.0 + 2440587.5; #elif OS_VXWORKS struct timespec sNow; clock_gettime(CLOCK_REALTIME, &sNow); *prNow = 2440587.5 + sNow.tv_sec/86400.0 + sNow.tv_nsec/86400000000000.0; ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains code that is specific to windows. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #if SQLITE_OS_WIN /* This file is used for windows only */ /* ** A Note About Memory Allocation: ** ................................................................................ ** This file contains macros and a little bit of code that is common to ** all of the platform-specific files (os_*.c) and is #included into those ** files. ** ** This file should be #included by the os_*.c files only. It is not a ** general purpose header file. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _OS_COMMON_H_ #define _OS_COMMON_H_ /* ** At least two bugs have slipped in because we changed the MEMORY_DEBUG ** macro to SQLITE_DEBUG and some older makefiles have not yet made the ................................................................................ ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains inline asm code for retrieving "high-performance" ** counters for x86 class CPUs. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _HWTIME_H_ #define _HWTIME_H_ /* ** The following routine only works on pentium-class (or newer) processors. ** It uses the RDTSC opcode to read the cycle count value out of the ................................................................................ ** Clear operations are exceedingly rare. There are usually between ** 5 and 500 set operations per Bitvec object, though the number of sets can ** sometimes grow into tens of thousands or larger. The size of the ** Bitvec object is the number of pages in the database file at the ** start of a transaction, and is thus usually less than a few thousand, ** but can be as large as 2 billion for a really big database. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* Size of the Bitvec structure in bytes. */ #define BITVEC_SZ 512 /* Round the union size down to the nearest pointer boundary, since that's how ** it will be aligned within the Bitvec struct. */ ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file implements that page cache. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** A complete page cache is an instance of this structure. */ struct PCache { PgHdr *pDirty, *pDirtyTail; /* List of dirty pages in LRU order */ ................................................................................ ** ** This file implements the default page cache implementation (the ** sqlite3_pcache interface). It also contains part of the implementation ** of the SQLITE_CONFIG_PAGECACHE and sqlite3_release_memory() features. ** If the default page cache implementation is overriden, then neither of ** these two features are available. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ typedef struct PCache1 PCache1; typedef struct PgHdr1 PgHdr1; typedef struct PgFreeslot PgFreeslot; ................................................................................ ** The cost of a TEST using the same batch number is O(logN). The cost ** of the first SMALLEST is O(NlogN). Second and subsequent SMALLEST ** primitives are constant time. The cost of DESTROY is O(N). ** ** There is an added cost of O(N) when switching between TEST and ** SMALLEST primitives. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Target size for allocation chunks. */ #define ROWSET_ALLOCATION_SIZE 1024 ................................................................................ ** The pager is used to access a database disk file. It implements ** atomic commit and rollback through the use of a journal file that ** is separate from the database file. The pager also implements file ** locking to prevent two processes from writing the same database ** file simultaneously, or one process from reading the database while ** another is writing. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef SQLITE_OMIT_DISKIO /* ** Macros for troubleshooting. Normally turned off */ #if 0 ................................................................................ #define PAGER_SYNCED 5 /* ** A macro used for invoking the codec if there is one */ #ifdef SQLITE_HAS_CODEC # define CODEC1(P,D,N,X,E) \ if( P->xCodec && P->xCodec(P->pCodecArg,D,N,X)==0 ){ E; } # define CODEC2(P,D,N,X,E,O) \ if( P->xCodec==0 ){ O=(char*)D; }else \ if( (O=(char*)(P->xCodec(P->pCodecArg,D,N,X)))==0 ){ E; } #else # define CODEC1(P,D,N,X,E) /* NO-OP */ # define CODEC2(P,D,N,X,E,O) O=(char*)D #endif /* ** The maximum allowed sector size. 16MB. If the xSectorsize() method ................................................................................ i64 journalOff; /* Current write offset in the journal file */ i64 journalHdr; /* Byte offset to previous journal header */ PagerSavepoint *aSavepoint; /* Array of active savepoints */ int nSavepoint; /* Number of elements in aSavepoint[] */ char dbFileVers[16]; /* Changes whenever database file changes */ u32 sectorSize; /* Assumed sector size during rollback */ int nExtra; /* Add this many bytes to each in-memory page */ u32 vfsFlags; /* Flags for sqlite3_vfs.xOpen() */ int pageSize; /* Number of bytes in a page */ Pgno mxPgno; /* Maximum allowed size of the database */ char *zFilename; /* Name of the database file */ char *zJournal; /* Name of the journal file */ int (*xBusyHandler)(void*); /* Function to call when busy */ void *pBusyHandlerArg; /* Context argument for xBusyHandler */ ................................................................................ #ifdef SQLITE_TEST int nHit, nMiss; /* Cache hits and missing */ int nRead, nWrite; /* Database pages read/written */ #endif void (*xReiniter)(DbPage*); /* Call this routine when reloading pages */ #ifdef SQLITE_HAS_CODEC void *(*xCodec)(void*,void*,Pgno,int); /* Routine for en/decoding data */ void *pCodecArg; /* First argument to xCodec() */ #endif char *pTmpSpace; /* Pager.pageSize bytes of space for tmp use */ i64 journalSizeLimit; /* Size limit for persistent journal files */ PCache *pPCache; /* Pointer to page cache object */ sqlite3_backup *pBackup; /* Pointer to list of ongoing backup processes */ }; ................................................................................ for(ii=0; ii<pPager->nSavepoint; ii++){ if( pPager->aSavepoint[ii].iHdrOffset==0 ){ pPager->aSavepoint[ii].iHdrOffset = pPager->journalOff; } } pPager->journalHdr = pPager->journalOff = journalHdrOffset(pPager); memcpy(zHeader, aJournalMagic, sizeof(aJournalMagic)); /* ** Write the nRec Field - the number of page records that follow this ** journal header. Normally, zero is written to this value at this time. ** After the records are added to the journal (and the journal synced, ** if in full-sync mode), the zero is overwritten with the true number ** of records (see syncJournal()). ................................................................................ ** * When the SQLITE_IOCAP_SAFE_APPEND flag is set. This guarantees ** that garbage data is never appended to the journal file. */ assert( isOpen(pPager->fd) || pPager->noSync ); if( (pPager->noSync) || (pPager->journalMode==PAGER_JOURNALMODE_MEMORY) || (sqlite3OsDeviceCharacteristics(pPager->fd)&SQLITE_IOCAP_SAFE_APPEND) ){ put32bits(&zHeader[sizeof(aJournalMagic)], 0xffffffff); }else{ put32bits(&zHeader[sizeof(aJournalMagic)], 0); } /* The random check-hash initialiser */ sqlite3_randomness(sizeof(pPager->cksumInit), &pPager->cksumInit); put32bits(&zHeader[sizeof(aJournalMagic)+4], pPager->cksumInit); /* The initial database size */ ................................................................................ ** ** If the journal header file appears to be corrupted, SQLITE_DONE is ** returned and *pNRec and *PDbSize are undefined. If JOURNAL_HDR_SZ bytes ** cannot be read from the journal file an error code is returned. */ static int readJournalHdr( Pager *pPager, /* Pager object */ i64 journalSize, /* Size of the open journal file in bytes */ u32 *pNRec, /* OUT: Value read from the nRec field */ u32 *pDbSize /* OUT: Value of original database size field */ ){ int rc; /* Return code */ unsigned char aMagic[8]; /* A buffer to hold the magic header */ i64 iHdrOff; /* Offset of journal header being read */ ................................................................................ iHdrOff = pPager->journalOff; /* Read in the first 8 bytes of the journal header. If they do not match ** the magic string found at the start of each journal header, return ** SQLITE_DONE. If an IO error occurs, return an error code. Otherwise, ** proceed. */ rc = sqlite3OsRead(pPager->jfd, aMagic, sizeof(aMagic), iHdrOff); if( rc ){ return rc; } if( memcmp(aMagic, aJournalMagic, sizeof(aMagic))!=0 ){ return SQLITE_DONE; } /* Read the first three 32-bit fields of the journal header: The nRec ** field, the checksum-initializer and the database size at the start ** of the transaction. Return an error code if anything goes wrong. */ if( SQLITE_OK!=(rc = read32bits(pPager->jfd, iHdrOff+8, pNRec)) ................................................................................ } /* Update the page-size to match the value read from the journal. ** Use a testcase() macro to make sure that malloc failure within ** PagerSetPagesize() is tested. */ iPageSize16 = (u16)iPageSize; rc = sqlite3PagerSetPagesize(pPager, &iPageSize16); testcase( rc!=SQLITE_OK ); assert( rc!=SQLITE_OK || iPageSize16==(u16)iPageSize ); /* Update the assumed sector-size to match the value used by ** the process that created this journal. If this journal was ** created by a process other than this one, then this routine ** is being called from within pager_playback(). The local value ................................................................................ && !isUnsync ){ i64 ofst = (pgno-1)*(i64)pPager->pageSize; rc = sqlite3OsWrite(pPager->fd, aData, pPager->pageSize, ofst); if( pgno>pPager->dbFileSize ){ pPager->dbFileSize = pgno; } sqlite3BackupUpdate(pPager->pBackup, pgno, aData); }else if( !isMainJrnl && pPg==0 ){ /* If this is a rollback of a savepoint and data was not written to ** the database and the page is not in-memory, there is a potential ** problem. When the page is next fetched by the b-tree layer, it ** will be read from the database file, which may or may not be ** current. ** ................................................................................ int isUnsync = 0; /* Read the next journal header from the journal file. If there are ** not enough bytes left in the journal file for a complete header, or ** it is corrupted, then a process must of failed while writing it. ** This indicates nothing more needs to be rolled back. */ rc = readJournalHdr(pPager, szJ, &nRec, &mxPg); if( rc!=SQLITE_OK ){ if( rc==SQLITE_DONE ){ rc = SQLITE_OK; } goto end_playback; } ................................................................................ ** of the main journal file. Continue to skip out-of-range pages and ** continue adding pages rolled back to pDone. */ while( rc==SQLITE_OK && pPager->journalOff<szJ ){ u32 ii; /* Loop counter */ u32 nJRec = 0; /* Number of Journal Records */ u32 dummy; rc = readJournalHdr(pPager, szJ, &nJRec, &dummy); assert( rc!=SQLITE_DONE ); /* ** The "pPager->journalHdr+JOURNAL_HDR_SZ(pPager)==pPager->journalOff" ** test is related to ticket #2565. See the discussion in the ** pager_playback() function for additional information. */ ................................................................................ ** higher-level code an opportunity to restore the EXTRA section to ** agree with the restored page data. */ SQLITE_PRIVATE void sqlite3PagerSetReiniter(Pager *pPager, void (*xReinit)(DbPage*)){ pPager->xReiniter = xReinit; } /* ** Change the page size used by the Pager object. The new page size ** is passed in *pPageSize. ** ** If the pager is in the error state when this function is called, it ** is a no-op. The value returned is the error state error code (i.e. ** one of SQLITE_IOERR, SQLITE_CORRUPT or SQLITE_FULL). ................................................................................ ** In all other cases, SQLITE_OK is returned. ** ** If the page size is not changed, either because one of the enumerated ** conditions above is not true, the pager was in error state when this ** function was called, or because the memory allocation attempt failed, ** then *pPageSize is set to the old, retained page size before returning. */ SQLITE_PRIVATE int sqlite3PagerSetPagesize(Pager *pPager, u16 *pPageSize){ int rc = pPager->errCode; if( rc==SQLITE_OK ){ u16 pageSize = *pPageSize; assert( pageSize==0 || (pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE) ); if( pageSize && pageSize!=pPager->pageSize && (pPager->memDb==0 || pPager->dbSize==0) && sqlite3PcacheRefCount(pPager->pPCache)==0 ................................................................................ pPager->pageSize = pageSize; sqlite3PageFree(pPager->pTmpSpace); pPager->pTmpSpace = pNew; sqlite3PcacheSetPageSize(pPager->pPCache, pageSize); } } *pPageSize = (u16)pPager->pageSize; } return rc; } /* ** Return a pointer to the "temporary page" buffer held internally ** by the pager. This is a buffer that is big enough to hold the ................................................................................ sqlite3EndBenignMalloc(); enable_simulated_io_errors(); PAGERTRACE(("CLOSE %d\n", PAGERID(pPager))); IOTRACE(("CLOSE %p\n", pPager)) sqlite3OsClose(pPager->fd); sqlite3PageFree(pPager->pTmpSpace); sqlite3PcacheClose(pPager->pPCache); assert( !pPager->aSavepoint && !pPager->pInJournal ); assert( !isOpen(pPager->jfd) && !isOpen(pPager->sjfd) ); sqlite3_free(pPager); return SQLITE_OK; } ................................................................................ assert( !pPager->tempFile ); if( pPager->journalMode!=PAGER_JOURNALMODE_MEMORY ){ int rc; /* Return code */ const int iDc = sqlite3OsDeviceCharacteristics(pPager->fd); assert( isOpen(pPager->jfd) ); if( 0==(iDc&SQLITE_IOCAP_SAFE_APPEND) ){ /* Variable iNRecOffset is set to the offset in the journal file ** of the nRec field of the most recently written journal header. ** This field will be updated following the xSync() operation ** on the journal file. */ i64 iNRecOffset = pPager->journalHdr + sizeof(aJournalMagic); /* This block deals with an obscure problem. If the last connection ** that wrote to this database was operating in persistent-journal ** mode, then the journal file may at this point actually be larger ** than Pager.journalOff bytes. If the next thing in the journal ** file happens to be a journal-header (written as part of the ** previous connections transaction), and a crash or power-failure ** occurs after nRec is updated but before this connection writes ................................................................................ ** byte to the start of it to prevent it from being recognized. ** ** Variable iNextHdrOffset is set to the offset at which this ** problematic header will occur, if it exists. aMagic is used ** as a temporary buffer to inspect the first couple of bytes of ** the potential journal header. */ i64 iNextHdrOffset = journalHdrOffset(pPager); u8 aMagic[8]; rc = sqlite3OsRead(pPager->jfd, aMagic, 8, iNextHdrOffset); if( rc==SQLITE_OK && 0==memcmp(aMagic, aJournalMagic, 8) ){ static const u8 zerobyte = 0; rc = sqlite3OsWrite(pPager->jfd, &zerobyte, 1, iNextHdrOffset); } if( rc!=SQLITE_OK && rc!=SQLITE_IOERR_SHORT_READ ){ return rc; ................................................................................ */ if( pPager->fullSync && 0==(iDc&SQLITE_IOCAP_SEQUENTIAL) ){ PAGERTRACE(("SYNC journal of %d\n", PAGERID(pPager))); IOTRACE(("JSYNC %p\n", pPager)) rc = sqlite3OsSync(pPager->jfd, pPager->sync_flags); if( rc!=SQLITE_OK ) return rc; } IOTRACE(("JHDR %p %lld %d\n", pPager, iNRecOffset, 4)); rc = write32bits(pPager->jfd, iNRecOffset, pPager->nRec); if( rc!=SQLITE_OK ) return rc; } if( 0==(iDc&SQLITE_IOCAP_SEQUENTIAL) ){ PAGERTRACE(("SYNC journal of %d\n", PAGERID(pPager))); IOTRACE(("JSYNC %p\n", pPager)) rc = sqlite3OsSync(pPager->jfd, pPager->sync_flags| (pPager->sync_flags==SQLITE_SYNC_FULL?SQLITE_SYNC_DATAONLY:0) ................................................................................ memcpy(&pPager->dbFileVers, &pData[24], sizeof(pPager->dbFileVers)); } if( pgno>pPager->dbFileSize ){ pPager->dbFileSize = pgno; } /* Update any backup objects copying the contents of this pager. */ sqlite3BackupUpdate(pPager->pBackup, pgno, (u8 *)pData); PAGERTRACE(("STORE %d page %d hash(%08x)\n", PAGERID(pPager), pgno, pager_pagehash(pList))); IOTRACE(("PGOUT %p %d\n", pPager, pgno)); PAGER_INCR(sqlite3_pager_writedb_count); PAGER_INCR(pPager->nWrite); }else{ ................................................................................ } /* The following call to PagerSetPagesize() serves to set the value of ** Pager.pageSize and to allocate the Pager.pTmpSpace buffer. */ if( rc==SQLITE_OK ){ assert( pPager->memDb==0 ); rc = sqlite3PagerSetPagesize(pPager, &szPageDflt); testcase( rc!=SQLITE_OK ); } /* If an error occurred in either of the blocks above, free the ** Pager structure and close the file. */ if( rc!=SQLITE_OK ){ ................................................................................ assert( !pPager->pTmpSpace ); sqlite3OsClose(pPager->fd); sqlite3_free(pPager); return rc; } /* Initialize the PCache object. */ nExtra = ROUND8(nExtra); sqlite3PcacheOpen(szPageDflt, nExtra, !memDb, !memDb?pagerStress:0, (void *)pPager, pPager->pPCache); PAGERTRACE(("OPEN %d %s\n", FILEHANDLEID(pPager->fd), pPager->zFilename)); IOTRACE(("OPEN %p %s\n", pPager, pPager->zFilename)) ................................................................................ /* pPager->needSync = 0; */ pPager->noSync = (pPager->tempFile || !useJournal) ?1:0; pPager->fullSync = pPager->noSync ?0:1; pPager->sync_flags = SQLITE_SYNC_NORMAL; /* pPager->pFirst = 0; */ /* pPager->pFirstSynced = 0; */ /* pPager->pLast = 0; */ pPager->nExtra = nExtra; pPager->journalSizeLimit = SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT; assert( isOpen(pPager->fd) || tempFile ); setSectorSize(pPager); if( memDb ){ pPager->journalMode = PAGER_JOURNALMODE_MEMORY; } /* pPager->xBusyHandler = 0; */ ................................................................................ ** IO error occurs while locking the database, checking for a hot-journal ** file or rolling back a journal file, the IO error code is returned. */ static int pagerSharedLock(Pager *pPager){ int rc = SQLITE_OK; /* Return code */ int isErrorReset = 0; /* True if recovering from error state */ /* If this database is opened for exclusive access, has no outstanding ** page references and is in an error-state, this is a chance to clear ** the error. Discard the contents of the pager-cache and treat any ** open journal file as a hot-journal. */ if( !MEMDB && pPager->exclusiveMode && sqlite3PcacheRefCount(pPager->pPCache)==0 && pPager->errCode ){ if( isOpen(pPager->jfd) ){ isErrorReset = 1; } pPager->errCode = SQLITE_OK; pager_reset(pPager); } /* If the pager is still in an error state, do not proceed. The error ................................................................................ rc = sqlite3OsOpen(pVfs, pPager->zJournal, pPager->jfd, f, &fout); assert( rc!=SQLITE_OK || isOpen(pPager->jfd) ); if( rc==SQLITE_OK && fout&SQLITE_OPEN_READONLY ){ rc = SQLITE_CANTOPEN; sqlite3OsClose(pPager->jfd); } }else{ /* If the journal does not exist, that means some other process ** has already rolled it back */ rc = SQLITE_BUSY; } } } if( rc!=SQLITE_OK ){ goto failed; } ................................................................................ pPager->journalHdr = 0; /* Playback and delete the journal. Drop the database write ** lock and reacquire the read lock. Purge the cache before ** playing back the hot-journal so that we don't end up with ** an inconsistent cache. */ rc = pager_playback(pPager, 1); if( rc!=SQLITE_OK ){ rc = pager_error(pPager, rc); goto failed; } assert( (pPager->state==PAGER_SHARED) || (pPager->exclusiveMode && pPager->state>PAGER_SHARED) ); } if( pPager->pBackup || sqlite3PcachePagecount(pPager->pPCache)>0 ){ ................................................................................ if( rc!=SQLITE_OK ){ return rc; } assert( pPager->state!=PAGER_UNLOCK ); rc = sqlite3PcacheFetch(pPager->pPCache, pgno, 1, &pPg); if( rc!=SQLITE_OK ){ return rc; } assert( pPg->pgno==pgno ); assert( pPg->pPager==pPager || pPg->pPager==0 ); if( pPg->pPager==0 ){ /* The pager cache has created a new page. Its content needs to ** be initialized. ................................................................................ */ SQLITE_PRIVATE int sqlite3PagerNosync(Pager *pPager){ return pPager->noSync; } #ifdef SQLITE_HAS_CODEC /* ** Set the codec for this pager */ SQLITE_PRIVATE void sqlite3PagerSetCodec( Pager *pPager, void *(*xCodec)(void*,void*,Pgno,int), void *pCodecArg ){ pPager->xCodec = xCodec; pPager->pCodecArg = pCodecArg; } #endif #ifndef SQLITE_OMIT_AUTOVACUUM /* ** Move the page pPg to location pgno in the file. ** ................................................................................ ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ ** ** This file contains code used to implement mutexes on Btree objects. ** This code really belongs in btree.c. But btree.c is getting too ** big and we want to break it down some. This packaged seemed like ** a good breakout. */ /************** Include btreeInt.h in the middle of btmutex.c ****************/ ................................................................................ ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ ** ** This file implements a external (disk-based) database using BTrees. ** For a detailed discussion of BTrees, refer to ** ** Donald E. Knuth, THE ART OF COMPUTER PROGRAMMING, Volume 3: ** "Sorting And Searching", pages 473-480. Addison-Wesley ** Publishing Company, Reading, Massachusetts. ................................................................................ ** 22 1 Min embedded payload fraction ** 23 1 Min leaf payload fraction ** 24 4 File change counter ** 28 4 Reserved for future use ** 32 4 First freelist page ** 36 4 Number of freelist pages in the file ** 40 60 15 4-byte meta values passed to higher layers ** ** All of the integer values are big-endian (most significant byte first). ** ** The file change counter is incremented when the database is changed ** This counter allows other processes to know when the file has changed ** and thus when they need to flush their cache. ** ................................................................................ void *pKey; /* Saved key that was cursor's last known position */ i64 nKey; /* Size of pKey, or last integer key */ int skip; /* (skip<0) -> Prev() is a no-op. (skip>0) -> Next() is */ #ifndef SQLITE_OMIT_INCRBLOB u8 isIncrblobHandle; /* True if this cursor is an incr. io handle */ Pgno *aOverflow; /* Cache of overflow page locations */ #endif #ifndef NDEBUG u8 pagesShuffled; /* True if Btree pages are rearranged by balance()*/ #endif i16 iPage; /* Index of current page in apPage */ MemPage *apPage[BTCURSOR_MAX_DEPTH]; /* Pages from root to current page */ u16 aiIdx[BTCURSOR_MAX_DEPTH]; /* Current index in apPage[i] */ }; /* ** Potential values for BtCursor.eState. ................................................................................ ** Internal routines that should be accessed by the btree layer only. */ SQLITE_PRIVATE int sqlite3BtreeGetPage(BtShared*, Pgno, MemPage**, int); SQLITE_PRIVATE int sqlite3BtreeInitPage(MemPage *pPage); SQLITE_PRIVATE void sqlite3BtreeParseCellPtr(MemPage*, u8*, CellInfo*); SQLITE_PRIVATE void sqlite3BtreeParseCell(MemPage*, int, CellInfo*); SQLITE_PRIVATE int sqlite3BtreeRestoreCursorPosition(BtCursor *pCur); SQLITE_PRIVATE void sqlite3BtreeGetTempCursor(BtCursor *pCur, BtCursor *pTempCur); SQLITE_PRIVATE void sqlite3BtreeReleaseTempCursor(BtCursor *pCur); SQLITE_PRIVATE void sqlite3BtreeMoveToParent(BtCursor *pCur); /************** End of btreeInt.h ********************************************/ /************** Continuing where we left off in btmutex.c ********************/ #ifndef SQLITE_OMIT_SHARED_CACHE #if SQLITE_THREADSAFE /* ................................................................................ ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ ** ** This file implements a external (disk-based) database using BTrees. ** See the header comment on "btreeInt.h" for additional information. ** Including a description of file format and an overview of operation. */ /* ................................................................................ if( *pEType<1 || *pEType>5 ) return SQLITE_CORRUPT_BKPT; return SQLITE_OK; } #else /* if defined SQLITE_OMIT_AUTOVACUUM */ #define ptrmapPut(w,x,y,z) SQLITE_OK #define ptrmapGet(w,x,y,z) SQLITE_OK #define ptrmapPutOvfl(y,z) SQLITE_OK #endif /* ** Given a btree page and a cell index (0 means the first cell on ** the page, 1 means the second cell, and so forth) return a pointer ** to the cell content. ** ................................................................................ ** for the overflow page. */ static int ptrmapPutOvflPtr(MemPage *pPage, u8 *pCell){ CellInfo info; assert( pCell!=0 ); sqlite3BtreeParseCellPtr(pPage, pCell, &info); assert( (info.nData+(pPage->intKey?0:info.nKey))==info.nPayload ); if( (info.nData+(pPage->intKey?0:info.nKey))>info.nLocal ){ Pgno ovfl = get4byte(&pCell[info.iOverflow]); return ptrmapPut(pPage->pBt, ovfl, PTRMAP_OVERFLOW1, pPage->pgno); } return SQLITE_OK; } /* ** If the cell with index iCell on page pPage contains a pointer ** to an overflow page, insert an entry into the pointer-map ** for the overflow page. */ static int ptrmapPutOvfl(MemPage *pPage, int iCell){ u8 *pCell; assert( sqlite3_mutex_held(pPage->pBt->mutex) ); pCell = findOverflowCell(pPage, iCell); return ptrmapPutOvflPtr(pPage, pCell); } #endif /* ** Defragment the page given. All Cells are moved to the ** end of the page and all free space is collected into one ** big FreeBlk that occurs in between the header and cell ................................................................................ /* Assert that the space between the cell-offset array and the ** cell-content area is greater than nByte bytes. */ assert( nByte <= ( get2byte(&data[hdr+5])-(hdr+8+(pPage->leaf?0:4)+2*get2byte(&data[hdr+3])) )); pPage->nFree -= (u16)nByte; nFrag = data[hdr+7]; if( nFrag>=60 ){ defragmentPage(pPage); }else{ /* Search the freelist looking for a free slot big enough to satisfy ** the request. The allocation is made from the first free slot in ** the list that is large enough to accomadate it. ................................................................................ if ( pbegin>pPage->pBt->usableSize-4 ) { return SQLITE_CORRUPT_BKPT; } assert( pbegin>addr || pbegin==0 ); put2byte(&data[addr], start); put2byte(&data[start], pbegin); put2byte(&data[start+2], size); pPage->nFree += (u16)size; /* Coalesce adjacent free blocks */ addr = pPage->hdrOffset + 1; while( (pbegin = get2byte(&data[addr]))>0 ){ int pnext, psize, x; assert( pbegin>addr ); assert( pbegin<=pPage->pBt->usableSize-4 ); ................................................................................ } next = get2byte(&data[pc]); size = get2byte(&data[pc+2]); if( next>0 && next<=pc+size+3 ){ /* Free blocks must be in accending order */ return SQLITE_CORRUPT_BKPT; } nFree += size; pc = next; } /* At this point, nFree contains the sum of the offset to the start ** of the cell-content area plus the number of free bytes within ** the cell-content area. If this is greater than the usable-size ** of the page, then the page must be corrupted. This check also ................................................................................ nReserve = zDbHeader[20]; pBt->pageSizeFixed = 1; #ifndef SQLITE_OMIT_AUTOVACUUM pBt->autoVacuum = (get4byte(&zDbHeader[36 + 4*4])?1:0); pBt->incrVacuum = (get4byte(&zDbHeader[36 + 7*4])?1:0); #endif } rc = sqlite3PagerSetPagesize(pBt->pPager, &pBt->pageSize); if( rc ) goto btree_open_out; pBt->usableSize = pBt->pageSize - nReserve; assert( (pBt->pageSize & 7)==0 ); /* 8-byte alignment of pageSize */ #if !defined(SQLITE_OMIT_SHARED_CACHE) && !defined(SQLITE_OMIT_DISKIO) /* Add the new BtShared object to the linked list sharable BtShareds. */ ................................................................................ assert( nReserve>=0 && nReserve<=255 ); if( pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE && ((pageSize-1)&pageSize)==0 ){ assert( (pageSize & 7)==0 ); assert( !pBt->pPage1 && !pBt->pCursor ); pBt->pageSize = (u16)pageSize; freeTempSpace(pBt); rc = sqlite3PagerSetPagesize(pBt->pPager, &pBt->pageSize); } pBt->usableSize = pBt->pageSize - (u16)nReserve; if( iFix ) pBt->pageSizeFixed = 1; sqlite3BtreeLeave(p); return rc; } /* ................................................................................ ** zero and return SQLITE_OK. The caller will call this function ** again with the correct page-size. */ releasePage(pPage1); pBt->usableSize = (u16)usableSize; pBt->pageSize = (u16)pageSize; freeTempSpace(pBt); rc = sqlite3PagerSetPagesize(pBt->pPager, &pBt->pageSize); if( rc ) goto page1_init_failed; return SQLITE_OK; } if( usableSize<500 ){ goto page1_init_failed; } pBt->pageSize = (u16)pageSize; pBt->usableSize = (u16)usableSize; #ifndef SQLITE_OMIT_AUTOVACUUM pBt->autoVacuum = (get4byte(&page1[36 + 4*4])?1:0); pBt->incrVacuum = (get4byte(&page1[36 + 7*4])?1:0); ................................................................................ ** If there are any outstanding cursors, this routine is a no-op. ** ** If there is a transaction in progress, this routine is a no-op. */ static void unlockBtreeIfUnused(BtShared *pBt){ assert( sqlite3_mutex_held(pBt->mutex) ); if( pBt->inTransaction==TRANS_NONE && pBt->pCursor==0 && pBt->pPage1!=0 ){ if( sqlite3PagerRefcount(pBt->pPager)>=1 ){ assert( pBt->pPage1->aData ); releasePage(pBt->pPage1); } pBt->pPage1 = 0; } } /* ** Create a new database by initializing the first page of the ** file. ................................................................................ invalidateOverflowCache(pCur); /* sqlite3_free(pCur); */ sqlite3BtreeLeave(pBtree); } return SQLITE_OK; } /* ** Make a temporary cursor by filling in the fields of pTempCur. ** The temporary cursor is not on the cursor list for the Btree. */ SQLITE_PRIVATE void sqlite3BtreeGetTempCursor(BtCursor *pCur, BtCursor *pTempCur){ int i; assert( cursorHoldsMutex(pCur) ); ................................................................................ pTempCur->pNext = 0; pTempCur->pPrev = 0; for(i=0; i<=pTempCur->iPage; i++){ sqlite3PagerRef(pTempCur->apPage[i]->pDbPage); } assert( pTempCur->pKey==0 ); } /* ** Delete a temporary cursor such as was made by the CreateTemporaryCursor() ** function above. */ SQLITE_PRIVATE void sqlite3BtreeReleaseTempCursor(BtCursor *pCur){ int i; assert( cursorHoldsMutex(pCur) ); for(i=0; i<=pCur->iPage; i++){ sqlite3PagerUnref(pCur->apPage[i]->pDbPage); } sqlite3_free(pCur->pKey); } /* ** Make sure the BtCursor* given in the argument has a valid ** BtCursor.info structure. If it is not already valid, call ** sqlite3BtreeParseCell() to fill it in. ** ** BtCursor.info is a cache of the information in the current cell. ................................................................................ Pgno *pPgno, Pgno nearby, u8 exact ){ MemPage *pPage1; int rc; u32 n; /* Number of pages on the freelist */ int k; /* Number of leaves on the trunk of the freelist */ MemPage *pTrunk = 0; MemPage *pPrevTrunk = 0; Pgno mxPage; /* Total size of the database file */ assert( sqlite3_mutex_held(pBt->mutex) ); pPage1 = pBt->pPage1; mxPage = pagerPagecount(pBt); ................................................................................ goto end_allocate_page; } *pPgno = iTrunk; memcpy(&pPage1->aData[32], &pTrunk->aData[0], 4); *ppPage = pTrunk; pTrunk = 0; TRACE(("ALLOCATE: %d trunk - %d free pages left\n", *pPgno, n-1)); }else if( k>pBt->usableSize/4 - 2 ){ /* Value of k is out of range. Database corruption */ rc = SQLITE_CORRUPT_BKPT; goto end_allocate_page; #ifndef SQLITE_OMIT_AUTOVACUUM }else if( searchList && nearby==iTrunk ){ /* The list is being searched and this trunk page is the page ** to allocate, regardless of whether it has leaves. ................................................................................ } put4byte(&pPrevTrunk->aData[0], iNewTrunk); } } pTrunk = 0; TRACE(("ALLOCATE: %d trunk - %d free pages left\n", *pPgno, n-1)); #endif }else{ /* Extract a leaf from the trunk */ int closest; Pgno iPage; unsigned char *aData = pTrunk->aData; rc = sqlite3PagerWrite(pTrunk->pDbPage); if( rc ){ goto end_allocate_page; } if( nearby>0 ){ int i, dist; closest = 0; dist = get4byte(&aData[8]) - nearby; if( dist<0 ) dist = -dist; for(i=1; i<k; i++){ int d2 = get4byte(&aData[8+i*4]) - nearby; if( d2<0 ) d2 = -d2; if( d2<dist ){ ................................................................................ goto end_allocate_page; } if( !searchList || iPage==nearby ){ int noContent; Pgno nPage; *pPgno = iPage; nPage = pagerPagecount(pBt); if( *pPgno>nPage ){ /* Free page off the end of the file */ rc = SQLITE_CORRUPT_BKPT; goto end_allocate_page; } TRACE(("ALLOCATE: %d was leaf %d of %d on trunk %d" ": %d more free pages\n", *pPgno, closest+1, k, pTrunk->pgno, n-1)); ................................................................................ */ static int insertCell( MemPage *pPage, /* Page into which we are copying */ int i, /* New cell becomes the i-th cell of the page */ u8 *pCell, /* Content of the new cell */ int sz, /* Bytes of content in pCell */ u8 *pTemp, /* Temp storage space for pCell, if needed */ u8 nSkip /* Do not write the first nSkip bytes of the cell */ ){ int idx; /* Where to write new cell content in data[] */ int j; /* Loop counter */ int top; /* First byte of content for any cell in data[] */ int end; /* First byte past the last cell pointer in data[] */ int ins; /* Index in data[] where new cell pointer is inserted */ int hdr; /* Offset into data[] of the page header */ int cellOffset; /* Address of first cell pointer in data[] */ u8 *data; /* The content of the whole page */ u8 *ptr; /* Used for moving information around in data[] */ assert( i>=0 && i<=pPage->nCell+pPage->nOverflow ); assert( pPage->nCell<=MX_CELL(pPage->pBt) && MX_CELL(pPage->pBt)<=5460 ); assert( pPage->nOverflow<=ArraySize(pPage->aOvfl) ); assert( sz==cellSizePtr(pPage, pCell) ); assert( sqlite3_mutex_held(pPage->pBt->mutex) ); if( pPage->nOverflow || sz+2>pPage->nFree ){ if( pTemp ){ memcpy(pTemp+nSkip, pCell+nSkip, sz-nSkip); pCell = pTemp; } j = pPage->nOverflow++; assert( j<(int)(sizeof(pPage->aOvfl)/sizeof(pPage->aOvfl[0])) ); pPage->aOvfl[j].pCell = pCell; pPage->aOvfl[j].idx = (u16)i; }else{ int rc = sqlite3PagerWrite(pPage->pDbPage); if( rc!=SQLITE_OK ){ ................................................................................ idx = allocateSpace(pPage, sz); assert( idx>0 ); assert( end <= get2byte(&data[hdr+5]) ); if (idx+sz > pPage->pBt->usableSize) { return SQLITE_CORRUPT_BKPT; } pPage->nCell++; pPage->nFree -= 2; memcpy(&data[idx+nSkip], pCell+nSkip, sz-nSkip); for(j=end-2, ptr=&data[j]; j>ins; j-=2, ptr-=2){ ptr[0] = ptr[-2]; ptr[1] = ptr[-1]; } put2byte(&data[ins], idx); put2byte(&data[hdr+3], pPage->nCell); #ifndef SQLITE_OMIT_AUTOVACUUM if( pPage->pBt->autoVacuum ){ /* The cell may contain a pointer to an overflow page. If so, write ** the entry for the overflow page into the pointer map. */ CellInfo info; sqlite3BtreeParseCellPtr(pPage, pCell, &info); assert( (info.nData+(pPage->intKey?0:info.nKey))==info.nPayload ); if( info.iOverflow ){ Pgno pgnoOvfl = get4byte(&pCell[info.iOverflow]); rc = ptrmapPut(pPage->pBt, pgnoOvfl, PTRMAP_OVERFLOW1, pPage->pgno); if( rc!=SQLITE_OK ) return rc; } } #endif } return SQLITE_OK; } ................................................................................ ** cell that will be inserted into pParent. Such a cell consists of a 4 ** byte page number followed by a variable length integer. In other ** words, at most 13 bytes. Hence the pSpace buffer must be at ** least 13 bytes in size. */ static int balance_quick(MemPage *pParent, MemPage *pPage, u8 *pSpace){ BtShared *const pBt = pPage->pBt; /* B-Tree Database */ MemPage *pNew = 0; /* Newly allocated page */ int rc; /* Return Code */ Pgno pgnoNew; /* Page number of pNew */ assert( sqlite3_mutex_held(pPage->pBt->mutex) ); assert( sqlite3PagerIswriteable(pParent->pDbPage) ); assert( pPage->nOverflow==1 ); ................................................................................ if( pPage->nCell<=0 ) return SQLITE_CORRUPT_BKPT; /* Allocate a new page. This page will become the right-sibling of ** pPage. Make the parent page writable, so that the new divider cell ** may be inserted. If both these operations are successful, proceed. */ rc = allocateBtreePage(pBt, &pNew, &pgnoNew, 0, 0); if( rc==SQLITE_OK ){ u8 *pOut = &pSpace[4]; u8 *pCell = pPage->aOvfl[0].pCell; u16 szCell = cellSizePtr(pPage, pCell); u8 *pStop; assert( sqlite3PagerIswriteable(pNew->pDbPage) ); assert( pPage->aData[0]==(PTF_INTKEY|PTF_LEAFDATA|PTF_LEAF) ); zeroPage(pNew, PTF_INTKEY|PTF_LEAFDATA|PTF_LEAF); assemblePage(pNew, 1, &pCell, &szCell); /* Create a divider cell to insert into pParent. The divider cell ** consists of a 4-byte page number (the page number of pPage) and ** a variable length key value (which must be the same value as the ** largest key on pPage). ** ** To find the largest key value on pPage, first find the right-most ................................................................................ ** cell on pPage. The first two fields of this cell are the ** record-length (a variable length integer at most 32-bits in size) ** and the key value (a variable length integer, may have any value). ** The first of the while(...) loops below skips over the record-length ** field. The second while(...) loop copies the key value from the ** cell on pPage into the pSpace buffer. */ put4byte(pSpace, pPage->pgno); pCell = findCell(pPage, pPage->nCell-1); pStop = &pCell[9]; while( (*(pCell++)&0x80) && pCell<pStop ); pStop = &pCell[9]; while( ((*(pOut++) = *(pCell++))&0x80) && pCell<pStop ); /* Insert the new divider cell into pParent */ insertCell(pParent, pParent->nCell, pSpace, (int)(pOut-pSpace), 0, 0); /* Set the right-child pointer of pParent to point to the new page. */ put4byte(&pParent->aData[pParent->hdrOffset+8], pgnoNew); /* If this is an auto-vacuum database, update the pointer map ** with entries for the new page, and any pointer from the ** cell on the page to an overflow page. */ if( ISAUTOVACUUM ){ rc = ptrmapPut(pBt, pgnoNew, PTRMAP_BTREE, pParent->pgno); if( rc==SQLITE_OK ){ rc = ptrmapPutOvfl(pNew, 0); } } /* Release the reference to the new page. */ releasePage(pNew); } return rc; } #endif /* SQLITE_OMIT_QUICKBALANCE */ /* ** This routine redistributes Cells on pPage and up to NN*2 siblings ** of pPage so that all pages have about the same amount of free space. ** Usually NN siblings on either side of pPage is used in the balancing, ** though more siblings might come from one side if pPage is the first ** or last child of its parent. If pPage has fewer than 2*NN siblings ** (something which can only happen if pPage is the root page or a ** child of root) then all available siblings participate in the balancing. ** ** The number of siblings of pPage might be increased or decreased by one or ** two in an effort to keep pages nearly full but not over full. The root page ** is special and is allowed to be nearly empty. If pPage is ** the root page, then the depth of the tree might be increased ** or decreased by one, as necessary, to keep the root page from being ** overfull or completely empty. ** ** Note that when this routine is called, some of the Cells on pPage ** might not actually be stored in pPage->aData[]. This can happen ** if the page is overfull. Part of the job of this routine is to ** make sure all Cells for pPage once again fit in pPage->aData[]. ** ** In the course of balancing the siblings of pPage, the parent of pPage ** might become overfull or underfull. If that happens, then this routine ** is called recursively on the parent. ** ** If this routine fails for any reason, it might leave the database ** in a corrupted state. So if this routine fails, the database should ** be rolled back. */ static int balance_nonroot(MemPage *pParent, int iParentIdx, u8 *aOvflSpace){ BtShared *pBt; /* The whole database */ int nCell = 0; /* Number of cells in apCell[] */ int nMaxCells = 0; /* Allocated size of apCell, szCell, aFrom. */ int nOld = 0; /* Number of pages in apOld[] */ int nNew = 0; /* Number of pages in apNew[] */ int i, j, k; /* Loop counters */ int nxDiv; /* Next divider slot in pParent->aCell[] */ int rc; /* The return code */ int leafCorrection; /* 4 if pPage is a leaf. 0 if not */ int leafData; /* True if pPage is a leaf of a LEAFDATA tree */ int usableSpace; /* Bytes in pPage beyond the header */ int pageFlags; /* Value of pPage->aData[0] */ int subtotal; /* Subtotal of bytes in cells on one page */ int iSpace1 = 0; /* First unused byte of aSpace1[] */ int iOvflSpace = 0; /* First unused byte of aOvflSpace[] */ int szScratch; /* Size of scratch memory requested */ MemPage *apOld[NB]; /* pPage and up to two siblings */ Pgno pgnoOld[NB]; /* Page numbers for each page in apOld[] */ MemPage *apCopy[NB]; /* Private copies of apOld[] pages */ MemPage *apNew[NB+2]; /* pPage and up to NB siblings after balancing */ Pgno pgnoNew[NB+2]; /* Page numbers for each page in apNew[] */ u8 *apDiv[NB]; /* Divider cells in pParent */ int cntNew[NB+2]; /* Index in aCell[] of cell after i-th page */ int szNew[NB+2]; /* Combined size of cells place on i-th page */ u8 **apCell = 0; /* All cells begin balanced */ u16 *szCell; /* Local size of all cells in apCell[] */ u8 *aCopy[NB]; /* Space for holding data of apCopy[] */ u8 *aSpace1; /* Space for copies of dividers cells before balance */ u8 *aFrom = 0; pBt = pParent->pBt; assert( sqlite3_mutex_held(pBt->mutex) ); assert( sqlite3PagerIswriteable(pParent->pDbPage) ); TRACE(("BALANCE: begin page %d child of %d\n", pPage->pgno, pParent->pgno)); /* Find the sibling pages to balance. Also locate the cells in pParent ** that divide the siblings. An attempt is made to find NN siblings on ** either side of pPage. More siblings are taken from one side, however, ** if there are fewer than NN siblings on the other side. If pParent ** has NB or fewer children then all children of pParent are taken. */ nxDiv = iParentIdx - NN; if( nxDiv + NB > pParent->nCell ){ nxDiv = pParent->nCell - NB + 1; } if( nxDiv<0 ){ nxDiv = 0; } for(i=0, k=nxDiv; i<NB; i++, k++){ if( k<pParent->nCell ){ apDiv[i] = findCell(pParent, k); assert( !pParent->leaf ); pgnoOld[i] = get4byte(apDiv[i]); }else if( k==pParent->nCell ){ pgnoOld[i] = get4byte(&pParent->aData[pParent->hdrOffset+8]); }else{ break; } rc = getAndInitPage(pBt, pgnoOld[i], &apOld[i]); if( rc ) goto balance_cleanup; apCopy[i] = 0; assert( i==nOld ); nOld++; nMaxCells += 1+apOld[i]->nCell+apOld[i]->nOverflow; } /* Make nMaxCells a multiple of 4 in order to preserve 8-byte ** alignment */ nMaxCells = (nMaxCells + 3)&~3; /* ** Allocate space for memory structures */ szScratch = nMaxCells*sizeof(u8*) /* apCell */ + nMaxCells*sizeof(u16) /* szCell */ + (ROUND8(sizeof(MemPage))+pBt->pageSize)*NB /* aCopy */ + pBt->pageSize /* aSpace1 */ + (ISAUTOVACUUM ? nMaxCells : 0); /* aFrom */ apCell = sqlite3ScratchMalloc( szScratch ); if( apCell==0 || aOvflSpace==0 ){ rc = SQLITE_NOMEM; goto balance_cleanup; } szCell = (u16*)&apCell[nMaxCells]; aCopy[0] = (u8*)&szCell[nMaxCells]; assert( EIGHT_BYTE_ALIGNMENT(aCopy[0]) ); for(i=1; i<NB; i++){ aCopy[i] = &aCopy[i-1][pBt->pageSize+ROUND8(sizeof(MemPage))]; assert( ((aCopy[i] - (u8*)0) & 7)==0 ); /* 8-byte alignment required */ } aSpace1 = &aCopy[NB-1][pBt->pageSize+ROUND8(sizeof(MemPage))]; assert( EIGHT_BYTE_ALIGNMENT(aSpace1) ); if( ISAUTOVACUUM ){ aFrom = &aSpace1[pBt->pageSize]; } /* ** Make copies of the content of pPage and its siblings into aOld[]. ** The rest of this function will use data from the copies rather ** that the original pages since the original pages will be in the ** process of being overwritten. */ for(i=0; i<nOld; i++){ MemPage *p = apCopy[i] = (MemPage*)aCopy[i]; memcpy(p, apOld[i], sizeof(MemPage)); p->aData = (void*)&p[1]; memcpy(p->aData, apOld[i]->aData, pBt->pageSize); } /* ** Load pointers to all cells on sibling pages and the divider cells ** into the local apCell[] array. Make copies of the divider cells ** into space obtained form aSpace1[] and remove the the divider Cells ** from pParent. ** ** If the siblings are on leaf pages, then the child pointers of the ** divider cells are stripped from the cells before they are copied ** into aSpace1[]. In this way, all cells in apCell[] are without ** child pointers. If siblings are not leaves, then all cell in ** apCell[] include child pointers. Either way, all cells in apCell[] ** are alike. ** ** leafCorrection: 4 if pPage is a leaf. 0 if pPage is not a leaf. ** leafData: 1 if pPage holds key+data and pParent holds only keys. */ nCell = 0; leafCorrection = apOld[0]->leaf*4; leafData = apOld[0]->hasData; for(i=0; i<nOld; i++){ MemPage *pOld = apCopy[i]; int limit = pOld->nCell+pOld->nOverflow; for(j=0; j<limit; j++){ assert( nCell<nMaxCells ); apCell[nCell] = findOverflowCell(pOld, j); szCell[nCell] = cellSizePtr(pOld, apCell[nCell]); if( ISAUTOVACUUM ){ int a; aFrom[nCell] = (u8)i; assert( i>=0 && i<6 ); for(a=0; a<pOld->nOverflow; a++){ if( pOld->aOvfl[a].pCell==apCell[nCell] ){ aFrom[nCell] = 0xFF; break; } } } nCell++; } if( i<nOld-1 ){ u16 sz = cellSizePtr(pParent, apDiv[i]); if( leafData ){ /* With the LEAFDATA flag, pParent cells hold only INTKEYs that ** are duplicates of keys on the child pages. We need to remove ** the divider cells from pParent, but the dividers cells are not ** added to apCell[] because they are duplicates of child cells. */ dropCell(pParent, nxDiv, sz); }else{ u8 *pTemp; assert( nCell<nMaxCells ); szCell[nCell] = sz; pTemp = &aSpace1[iSpace1]; iSpace1 += sz; assert( sz<=pBt->pageSize/4 ); assert( iSpace1<=pBt->pageSize ); memcpy(pTemp, apDiv[i], sz); apCell[nCell] = pTemp+leafCorrection; if( ISAUTOVACUUM ){ aFrom[nCell] = 0xFF; } dropCell(pParent, nxDiv, sz); assert( leafCorrection==0 || leafCorrection==4 ); szCell[nCell] -= (u16)leafCorrection; assert( get4byte(pTemp)==pgnoOld[i] ); if( !pOld->leaf ){ assert( leafCorrection==0 ); /* The right pointer of the child page pOld becomes the left ** pointer of the divider cell */ memcpy(apCell[nCell], &pOld->aData[pOld->hdrOffset+8], 4); }else{ assert( leafCorrection==4 ); if( szCell[nCell]<4 ){ /* Do not allow any cells smaller than 4 bytes. */ szCell[nCell] = 4; } } nCell++; } } } /* ** Figure out the number of pages needed to hold all nCell cells. ** Store this number in "k". Also compute szNew[] which is the total ** size of all cells on the i-th page and cntNew[] which is the index ................................................................................ /* Either we found one or more cells (cntnew[0])>0) or pPage is ** a virtual root page. A virtual root page is when the real root ** page is page 1 and we are the only child of that page. */ assert( cntNew[0]>0 || (pParent->pgno==1 && pParent->nCell==0) ); /* ** Allocate k new pages. Reuse old pages where possible. */ if( apOld[0]->pgno<=1 ){ rc = SQLITE_CORRUPT; goto balance_cleanup; } pageFlags = apOld[0]->aData[0]; for(i=0; i<k; i++){ MemPage *pNew; if( i<nOld ){ pNew = apNew[i] = apOld[i]; pgnoNew[i] = pgnoOld[i]; apOld[i] = 0; rc = sqlite3PagerWrite(pNew->pDbPage); nNew++; if( rc ) goto balance_cleanup; }else{ assert( i>0 ); rc = allocateBtreePage(pBt, &pNew, &pgnoNew[i], pgnoNew[i-1], 0); if( rc ) goto balance_cleanup; apNew[i] = pNew; nNew++; } } /* Free any old pages that were not reused as new pages. */ while( i<nOld ){ rc = freePage(apOld[i]); ................................................................................ ** n is never more than NB (a small constant), that should ** not be a problem. ** ** When NB==3, this one optimization makes the database ** about 25% faster for large insertions and deletions. */ for(i=0; i<k-1; i++){ int minV = pgnoNew[i]; int minI = i; for(j=i+1; j<k; j++){ if( pgnoNew[j]<(unsigned)minV ){ minI = j; minV = pgnoNew[j]; } } if( minI>i ){ int t; MemPage *pT; t = pgnoNew[i]; pT = apNew[i]; pgnoNew[i] = pgnoNew[minI]; apNew[i] = apNew[minI]; pgnoNew[minI] = t; apNew[minI] = pT; } } TRACE(("BALANCE: old: %d %d %d new: %d(%d) %d(%d) %d(%d) %d(%d) %d(%d)\n", pgnoOld[0], nOld>=2 ? pgnoOld[1] : 0, nOld>=3 ? pgnoOld[2] : 0, pgnoNew[0], szNew[0], nNew>=2 ? pgnoNew[1] : 0, nNew>=2 ? szNew[1] : 0, nNew>=3 ? pgnoNew[2] : 0, nNew>=3 ? szNew[2] : 0, nNew>=4 ? pgnoNew[3] : 0, nNew>=4 ? szNew[3] : 0, nNew>=5 ? pgnoNew[4] : 0, nNew>=5 ? szNew[4] : 0)); /* ** Evenly distribute the data in apCell[] across the new pages. ** Insert divider cells into pParent as necessary. */ j = 0; for(i=0; i<nNew; i++){ /* Assemble the new sibling page. */ MemPage *pNew = apNew[i]; assert( j<nMaxCells ); assert( pNew->pgno==pgnoNew[i] ); zeroPage(pNew, pageFlags); assemblePage(pNew, cntNew[i]-j, &apCell[j], &szCell[j]); assert( pNew->nCell>0 || (nNew==1 && cntNew[0]==0) ); assert( pNew->nOverflow==0 ); /* If this is an auto-vacuum database, update the pointer map entries ** that point to the siblings that were rearranged. These can be: left ** children of cells, the right-child of the page, or overflow pages ** pointed to by cells. */ if( ISAUTOVACUUM ){ for(k=j; k<cntNew[i]; k++){ assert( k<nMaxCells ); if( aFrom[k]==0xFF || apCopy[aFrom[k]]->pgno!=pNew->pgno ){ rc = ptrmapPutOvfl(pNew, k-j); if( rc==SQLITE_OK && leafCorrection==0 ){ rc = ptrmapPut(pBt, get4byte(apCell[k]), PTRMAP_BTREE, pNew->pgno); } if( rc!=SQLITE_OK ){ goto balance_cleanup; } } } } j = cntNew[i]; /* If the sibling page assembled above was not the right-most sibling, ** insert a divider cell into the parent page. */ if( i<nNew-1 && j<nCell ){ u8 *pCell; u8 *pTemp; int sz; assert( j<nMaxCells ); pCell = apCell[j]; sz = szCell[j] + leafCorrection; pTemp = &aOvflSpace[iOvflSpace]; if( !pNew->leaf ){ memcpy(&pNew->aData[8], pCell, 4); if( ISAUTOVACUUM && (aFrom[j]==0xFF || apCopy[aFrom[j]]->pgno!=pNew->pgno) ){ rc = ptrmapPut(pBt, get4byte(pCell), PTRMAP_BTREE, pNew->pgno); if( rc!=SQLITE_OK ){ goto balance_cleanup; } } }else if( leafData ){ /* If the tree is a leaf-data tree, and the siblings are leaves, ** then there is no divider cell in apCell[]. Instead, the divider ** cell consists of the integer key for the right-most cell of ** the sibling-page assembled above only. */ CellInfo info; j--; sqlite3BtreeParseCellPtr(pNew, apCell[j], &info); pCell = pTemp; sz = 4 + putVarint(&pCell[4], info.nKey); pTemp = 0; }else{ pCell -= 4; /* Obscure case for non-leaf-data trees: If the cell at pCell was ** previously stored on a leaf node, and its reported size was 4 ** bytes, then it may actually be smaller than this ** (see sqlite3BtreeParseCellPtr(), 4 bytes is the minimum size of ................................................................................ assert(leafCorrection==4); sz = cellSizePtr(pParent, pCell); } } iOvflSpace += sz; assert( sz<=pBt->pageSize/4 ); assert( iOvflSpace<=pBt->pageSize ); rc = insertCell(pParent, nxDiv, pCell, sz, pTemp, 4); if( rc!=SQLITE_OK ) goto balance_cleanup; assert( sqlite3PagerIswriteable(pParent->pDbPage) ); put4byte(findOverflowCell(pParent,nxDiv), pNew->pgno); /* If this is an auto-vacuum database, and not a leaf-data tree, ** then update the pointer map with an entry for the overflow page ** that the cell just inserted points to (if any). */ if( ISAUTOVACUUM && !leafData ){ rc = ptrmapPutOvfl(pParent, nxDiv); if( rc!=SQLITE_OK ){ goto balance_cleanup; } } j++; nxDiv++; } /* Set the pointer-map entry for the new sibling page. */ if( ISAUTOVACUUM ){ rc = ptrmapPut(pBt, pNew->pgno, PTRMAP_BTREE, pParent->pgno); if( rc!=SQLITE_OK ){ goto balance_cleanup; } } } assert( j==nCell ); assert( nOld>0 ); assert( nNew>0 ); if( (pageFlags & PTF_LEAF)==0 ){ u8 *zChild = &apCopy[nOld-1]->aData[8]; memcpy(&apNew[nNew-1]->aData[8], zChild, 4); if( ISAUTOVACUUM ){ rc = ptrmapPut(pBt, get4byte(zChild), PTRMAP_BTREE, apNew[nNew-1]->pgno); if( rc!=SQLITE_OK ){ goto balance_cleanup; } } } assert( sqlite3PagerIswriteable(pParent->pDbPage) ); if( nxDiv==pParent->nCell+pParent->nOverflow ){ /* Right-most sibling is the right-most child of pParent */ put4byte(&pParent->aData[pParent->hdrOffset+8], pgnoNew[nNew-1]); }else{ /* Right-most sibling is the left child of the first entry in pParent ** past the right-most divider entry */ put4byte(findOverflowCell(pParent, nxDiv), pgnoNew[nNew-1]); } /* ** Balance the parent page. Note that the current page (pPage) might ** have been added to the freelist so it might no longer be initialized. ** But the parent page will always be initialized. */ assert( pParent->isInit ); sqlite3ScratchFree(apCell); apCell = 0; TRACE(("BALANCE: finished with %d: old=%d new=%d cells=%d\n", pPage->pgno, nOld, nNew, nCell)); /* ** Cleanup before returning. */ balance_cleanup: sqlite3ScratchFree(apCell); for(i=0; i<nOld; i++){ releasePage(apOld[i]); } for(i=0; i<nNew; i++){ releasePage(apNew[i]); } return rc; } /* ** This function is used to copy the contents of the b-tree node stored ** on page pFrom to page pTo. If page pFrom was not a leaf page, then ** the pointer-map entries for each child page are updated so that the ** parent page stored in the pointer map is page pTo. If pFrom contained ** any cells with overflow page pointers, then the corresponding pointer ** map entries are also updated so that the parent page is page pTo. ** ** If pFrom is currently carrying any overflow cells (entries in the ** MemPage.aOvfl[] array), they are not copied to pTo. ** ** Before returning, page pTo is reinitialized using sqlite3BtreeInitPage(). ** ** The performance of this function is not critical. It is only used by ** the balance_shallower() and balance_deeper() procedures, neither of ** which are called often under normal circumstances. */ static int copyNodeContent(MemPage *pFrom, MemPage *pTo){ BtShared * const pBt = pFrom->pBt; u8 * const aFrom = pFrom->aData; u8 * const aTo = pTo->aData; int const iFromHdr = pFrom->hdrOffset; int const iToHdr = ((pTo->pgno==1) ? 100 : 0); int rc = SQLITE_OK; int iData; assert( pFrom->isInit ); assert( pFrom->nFree>=iToHdr ); assert( get2byte(&aFrom[iFromHdr+5])<=pBt->usableSize ); /* Copy the b-tree node content from page pFrom to page pTo. */ iData = get2byte(&aFrom[iFromHdr+5]); memcpy(&aTo[iData], &aFrom[iData], pBt->usableSize-iData); memcpy(&aTo[iToHdr], &aFrom[iFromHdr], pFrom->cellOffset + 2*pFrom->nCell); /* Reinitialize page pTo so that the contents of the MemPage structure ** match the new data. The initialization of pTo "cannot" fail, as the ** data copied from pFrom is known to be valid. */ pTo->isInit = 0; TESTONLY(rc = ) sqlite3BtreeInitPage(pTo); assert( rc==SQLITE_OK ); /* If this is an auto-vacuum database, update the pointer-map entries ** for any b-tree or overflow pages that pTo now contains the pointers to. */ if( ISAUTOVACUUM ){ rc = setChildPtrmaps(pTo); } return rc; } /* ** This routine is called on the root page of a btree when the root ** page contains no cells. This is an opportunity to make the tree ** shallower by one level. */ static int balance_shallower(MemPage *pRoot){ /* The root page is empty but has one child. Transfer the ** information from that one child into the root page if it ** will fit. This reduces the depth of the tree by one. ** ** If the root page is page 1, it has less space available than ** its child (due to the 100 byte header that occurs at the beginning ** of the database fle), so it might not be able to hold all of the ** information currently contained in the child. If this is the ** case, then do not do the transfer. Leave page 1 empty except ** for the right-pointer to the child page. The child page becomes ** the virtual root of the tree. */ int rc = SQLITE_OK; /* Return code */ int const hdr = pRoot->hdrOffset; /* Offset of root page header */ MemPage *pChild; /* Only child of pRoot */ Pgno const pgnoChild = get4byte(&pRoot->aData[pRoot->hdrOffset+8]); assert( pRoot->nCell==0 ); assert( sqlite3_mutex_held(pRoot->pBt->mutex) ); assert( !pRoot->leaf ); assert( pgnoChild>0 ); assert( pgnoChild<=pagerPagecount(pRoot->pBt) ); assert( hdr==0 || pRoot->pgno==1 ); rc = sqlite3BtreeGetPage(pRoot->pBt, pgnoChild, &pChild, 0); if( rc==SQLITE_OK ){ if( pChild->nFree>=hdr ){ if( hdr ){ rc = defragmentPage(pChild); } if( rc==SQLITE_OK ){ rc = copyNodeContent(pChild, pRoot); } if( rc==SQLITE_OK ){ rc = freePage(pChild); } }else{ /* The child has more information that will fit on the root. ** The tree is already balanced. Do nothing. */ TRACE(("BALANCE: child %d will not fit on page 1\n", pChild->pgno)); } releasePage(pChild); } return rc; } /* ** This function is called when the root page of a b-tree structure is ** overfull (has one or more overflow pages). ................................................................................ /* ** The page that pCur currently points to has just been modified in ** some way. This function figures out if this modification means the ** tree needs to be balanced, and if so calls the appropriate balancing ** routine. Balancing routines are: ** ** balance_quick() ** balance_shallower() ** balance_deeper() ** balance_nonroot() ** ** If built with SQLITE_DEBUG, pCur->pagesShuffled is set to true if ** balance_shallower(), balance_deeper() or balance_nonroot() is called. ** If none of these functions are invoked, pCur->pagesShuffled is left ** unmodified. */ static int balance(BtCursor *pCur){ int rc = SQLITE_OK; const int nMin = pCur->pBt->usableSize * 2 / 3; u8 aBalanceQuickSpace[13]; u8 *pFree = 0; ................................................................................ rc = balance_deeper(pPage, &pCur->apPage[1]); if( rc==SQLITE_OK ){ pCur->iPage = 1; pCur->aiIdx[0] = 0; pCur->aiIdx[1] = 0; assert( pCur->apPage[1]->nOverflow ); } VVA_ONLY( pCur->pagesShuffled = 1 ); }else{ /* The root page of the b-tree is now empty. If the root-page is not ** also a leaf page, it will have a single child page. Call ** balance_shallower to attempt to copy the contents of the single ** child-page into the root page (this may not be possible if the ** root page is page 1). ** ** Whether or not this is possible , the tree is now balanced. ** Therefore is no next iteration of the do-loop. */ if( pPage->nCell==0 && !pPage->leaf ){ rc = balance_shallower(pPage); VVA_ONLY( pCur->pagesShuffled = 1 ); } break; } }else if( pPage->nOverflow==0 && pPage->nFree<=nMin ){ break; }else{ MemPage * const pParent = pCur->apPage[iPage-1]; int const iIdx = pCur->aiIdx[iPage-1]; ................................................................................ ** different page). Once this subsequent call to balance_nonroot() ** has completed, it is safe to release the pSpace buffer used by ** the previous call, as the overflow cell data will have been ** copied either into the body of a database page or into the new ** pSpace buffer passed to the latter call to balance_nonroot(). */ u8 *pSpace = sqlite3PageMalloc(pCur->pBt->pageSize); rc = balance_nonroot(pParent, iIdx, pSpace); if( pFree ){ /* If pFree is not NULL, it points to the pSpace buffer used ** by a previous call to balance_nonroot(). Its contents are ** now stored either on real database pages or within the ** new pSpace buffer, so it may be safely freed here. */ sqlite3PageFree(pFree); } /* The pSpace buffer will be freed after the next call to ** balance_nonroot(), or just before this function returns, whichever ** comes first. */ pFree = pSpace; VVA_ONLY( pCur->pagesShuffled = 1 ); } } pPage->nOverflow = 0; /* The next iteration of the do-loop balances the parent page. */ releasePage(pPage); ................................................................................ */ if( SQLITE_OK!=(rc = saveAllCursors(pBt, pCur->pgnoRoot, pCur)) || (!loc && SQLITE_OK!=(rc = sqlite3BtreeMoveto(pCur, pKey, nKey, appendBias, &loc)) )){ return rc; } pPage = pCur->apPage[pCur->iPage]; assert( pPage->intKey || nKey>=0 ); assert( pPage->intKey || nKey>=0 ); assert( pPage->leaf || !pPage->intKey ); TRACE(("INSERT: table=%d nkey=%lld ndata=%d page=%d %s\n", pCur->pgnoRoot, nKey, nData, pPage->pgno, loc==0 ? "overwrite" : "new entry")); assert( pPage->isInit ); allocateTempSpace(pBt); ................................................................................ newCell = pBt->pTmpSpace; if( newCell==0 ) return SQLITE_NOMEM; rc = fillInCell(pPage, newCell, pKey, nKey, pData, nData, nZero, &szNew); if( rc ) goto end_insert; assert( szNew==cellSizePtr(pPage, newCell) ); assert( szNew<=MX_CELL_SIZE(pBt) ); idx = pCur->aiIdx[pCur->iPage]; if( loc==0 && CURSOR_VALID==pCur->eState ){ u16 szOld; assert( idx<pPage->nCell ); rc = sqlite3PagerWrite(pPage->pDbPage); if( rc ){ goto end_insert; } oldCell = findCell(pPage, idx); ................................................................................ /* If no error has occured and pPage has an overflow cell, call balance() ** to redistribute the cells within the tree. Since balance() may move ** the cursor, zero the BtCursor.info.nSize and BtCursor.validNKey ** variables. ** ** Previous versions of SQLite called moveToRoot() to move the cursor ** back to the root page as balance() used to invalidate the contents ** of BtCursor.apPage[] and BtCursor.aiIdx[]. This is no longer necessary, ** as balance() always leaves the cursor pointing to a valid entry. ** ** There is a subtle but important optimization here too. When inserting ** multiple records into an intkey b-tree using a single cursor (as can ** happen while processing an "INSERT INTO ... SELECT" statement), it ** is advantageous to leave the cursor pointing to the last entry in ** the b-tree if possible. If the cursor is left pointing to the last ** entry in the table, and the next row inserted has an integer key ** larger than the largest existing key, it is possible to insert the ** row without seeking the cursor. This can be a big performance boost. */ pCur->info.nSize = 0; pCur->validNKey = 0; if( rc==SQLITE_OK && pPage->nOverflow ){ pCur->atLast = 0; rc = balance(pCur); /* Must make sure nOverflow is reset to zero even if the balance() ** fails. Internal data structure corruption will result otherwise. */ pCur->apPage[pCur->iPage]->nOverflow = 0; } assert( pCur->apPage[pCur->iPage]->nOverflow==0 ); end_insert: return rc; } /* ** Delete the entry that the cursor is pointing to. The cursor ** is left pointing at a arbitrary location. */ SQLITE_PRIVATE int sqlite3BtreeDelete(BtCursor *pCur){ MemPage *pPage = pCur->apPage[pCur->iPage]; int idx; unsigned char *pCell; int rc; Pgno pgnoChild = 0; Btree *p = pCur->pBtree; BtShared *pBt = p->pBt; assert( cursorHoldsMutex(pCur) ); assert( pPage->isInit ); assert( pBt->inTransaction==TRANS_WRITE ); assert( !pBt->readOnly ); if( pCur->eState==CURSOR_FAULT ){ return pCur->skip; } if( NEVER(pCur->aiIdx[pCur->iPage]>=pPage->nCell) ){ return SQLITE_ERROR; /* The cursor is not pointing to anything */ } assert( pCur->wrFlag ); rc = checkForReadConflicts(p, pCur->pgnoRoot, pCur, pCur->info.nKey); if( rc!=SQLITE_OK ){ /* The table pCur points to has a read lock */ assert( rc==SQLITE_LOCKED_SHAREDCACHE ); return rc; } /* Restore the current cursor position (a no-op if the cursor is not in ** CURSOR_REQUIRESEEK state) and save the positions of any other cursors ** open on the same table. Then call sqlite3PagerWrite() on the page ** that the entry will be deleted from. */ if( (rc = restoreCursorPosition(pCur))!=0 || (rc = saveAllCursors(pBt, pCur->pgnoRoot, pCur))!=0 || (rc = sqlite3PagerWrite(pPage->pDbPage))!=0 ){ return rc; } /* Locate the cell within its page and leave pCell pointing to the ** data. The clearCell() call frees any overflow pages associated with the ** cell. The cell itself is still intact. */ idx = pCur->aiIdx[pCur->iPage]; pCell = findCell(pPage, idx); if( !pPage->leaf ){ pgnoChild = get4byte(pCell); } rc = clearCell(pPage, pCell); if( rc ){ return rc; } if( !pPage->leaf ){ /* ** The entry we are about to delete is not a leaf so if we do not ** do something we will leave a hole on an internal page. ** We have to fill the hole by moving in a cell from a leaf. The ** next Cell after the one to be deleted is guaranteed to exist and ** to be a leaf so we can use it. */ BtCursor leafCur; MemPage *pLeafPage = 0; unsigned char *pNext; int notUsed; unsigned char *tempCell = 0; assert( !pPage->intKey ); sqlite3BtreeGetTempCursor(pCur, &leafCur); rc = sqlite3BtreeNext(&leafCur, ¬Used); if( rc==SQLITE_OK ){ assert( leafCur.aiIdx[leafCur.iPage]==0 ); pLeafPage = leafCur.apPage[leafCur.iPage]; rc = sqlite3PagerWrite(pLeafPage->pDbPage); } if( rc==SQLITE_OK ){ int leafCursorInvalid = 0; u16 szNext; TRACE(("DELETE: table=%d delete internal from %d replace from leaf %d\n", pCur->pgnoRoot, pPage->pgno, pLeafPage->pgno)); dropCell(pPage, idx, cellSizePtr(pPage, pCell)); pNext = findCell(pLeafPage, 0); szNext = cellSizePtr(pLeafPage, pNext); assert( MX_CELL_SIZE(pBt)>=szNext+4 ); allocateTempSpace(pBt); tempCell = pBt->pTmpSpace; if( tempCell==0 ){ rc = SQLITE_NOMEM; } if( rc==SQLITE_OK ){ rc = insertCell(pPage, idx, pNext-4, szNext+4, tempCell, 0); } /* The "if" statement in the next code block is critical. The ** slightest error in that statement would allow SQLite to operate ** correctly most of the time but produce very rare failures. To ** guard against this, the following macros help to verify that ** the "if" statement is well tested. */ testcase( pPage->nOverflow==0 && pPage->nFree<pBt->usableSize*2/3 && pLeafPage->nFree+2+szNext > pBt->usableSize*2/3 ); testcase( pPage->nOverflow==0 && pPage->nFree==pBt->usableSize*2/3 && pLeafPage->nFree+2+szNext > pBt->usableSize*2/3 ); testcase( pPage->nOverflow==0 && pPage->nFree==pBt->usableSize*2/3+1 && pLeafPage->nFree+2+szNext > pBt->usableSize*2/3 ); testcase( pPage->nOverflow>0 && pPage->nFree<=pBt->usableSize*2/3 && pLeafPage->nFree+2+szNext > pBt->usableSize*2/3 ); testcase( (pPage->nOverflow>0 || (pPage->nFree > pBt->usableSize*2/3)) && pLeafPage->nFree+2+szNext == pBt->usableSize*2/3 ); if( (pPage->nOverflow>0 || (pPage->nFree > pBt->usableSize*2/3)) && (pLeafPage->nFree+2+szNext > pBt->usableSize*2/3) ){ /* This branch is taken if the internal node is now either overflowing ** or underfull and the leaf node will be underfull after the just cell ** copied to the internal node is deleted from it. This is a special ** case because the call to balance() to correct the internal node ** may change the tree structure and invalidate the contents of ** the leafCur.apPage[] and leafCur.aiIdx[] arrays, which will be ** used by the balance() required to correct the underfull leaf ** node. ** ** The formula used in the expression above are based on facets of ** the SQLite file-format that do not change over time. */ testcase( pPage->nFree==pBt->usableSize*2/3+1 ); testcase( pLeafPage->nFree+2+szNext==pBt->usableSize*2/3+1 ); leafCursorInvalid = 1; } if( rc==SQLITE_OK ){ assert( sqlite3PagerIswriteable(pPage->pDbPage) ); put4byte(findOverflowCell(pPage, idx), pgnoChild); VVA_ONLY( pCur->pagesShuffled = 0 ); rc = balance(pCur); } if( rc==SQLITE_OK && leafCursorInvalid ){ /* The leaf-node is now underfull and so the tree needs to be ** rebalanced. However, the balance() operation on the internal ** node above may have modified the structure of the B-Tree and ** so the current contents of leafCur.apPage[] and leafCur.aiIdx[] ** may not be trusted. ** ** It is not possible to copy the ancestry from pCur, as the same ** balance() call has invalidated the pCur->apPage[] and aiIdx[] ** arrays. ** ** The call to saveCursorPosition() below internally saves the ** key that leafCur is currently pointing to. Currently, there ** are two copies of that key in the tree - one here on the leaf ** page and one on some internal node in the tree. The copy on ** the leaf node is always the next key in tree-order after the ** copy on the internal node. So, the call to sqlite3BtreeNext() ** calls restoreCursorPosition() to point the cursor to the copy ** stored on the internal node, then advances to the next entry, ** which happens to be the copy of the key on the internal node. ** Net effect: leafCur is pointing back to the duplicate cell ** that needs to be removed, and the leafCur.apPage[] and ** leafCur.aiIdx[] arrays are correct. */ VVA_ONLY( Pgno leafPgno = pLeafPage->pgno ); rc = saveCursorPosition(&leafCur); if( rc==SQLITE_OK ){ rc = sqlite3BtreeNext(&leafCur, ¬Used); } pLeafPage = leafCur.apPage[leafCur.iPage]; assert( rc!=SQLITE_OK || pLeafPage->pgno==leafPgno ); assert( rc!=SQLITE_OK || leafCur.aiIdx[leafCur.iPage]==0 ); } if( SQLITE_OK==rc && SQLITE_OK==(rc = sqlite3PagerWrite(pLeafPage->pDbPage)) ){ dropCell(pLeafPage, 0, szNext); VVA_ONLY( leafCur.pagesShuffled = 0 ); rc = balance(&leafCur); assert( leafCursorInvalid || !leafCur.pagesShuffled || !pCur->pagesShuffled ); } } sqlite3BtreeReleaseTempCursor(&leafCur); }else{ TRACE(("DELETE: table=%d delete from leaf %d\n", pCur->pgnoRoot, pPage->pgno)); rc = dropCell(pPage, idx, cellSizePtr(pPage, pCell)); if( rc==SQLITE_OK ){ rc = balance(pCur); } } if( rc==SQLITE_OK ){ moveToRoot(pCur); } return rc; } /* ................................................................................ /* Move the page currently at pgnoRoot to pgnoMove. */ rc = sqlite3BtreeGetPage(pBt, pgnoRoot, &pRoot, 0); if( rc!=SQLITE_OK ){ return rc; } rc = ptrmapGet(pBt, pgnoRoot, &eType, &iPtrPage); if( rc!=SQLITE_OK || eType==PTRMAP_ROOTPAGE || eType==PTRMAP_FREEPAGE ){ releasePage(pRoot); return rc; } assert( eType!=PTRMAP_ROOTPAGE ); assert( eType!=PTRMAP_FREEPAGE ); rc = relocatePage(pBt, pRoot, eType, iPtrPage, pgnoMove, 0); releasePage(pRoot); ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains the implementation of the sqlite3_backup_XXX() ** API functions and the related features. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* Macro to find the minimum of two numeric values. */ #ifndef MIN # define MIN(x,y) ((x)<(y)?(x):(y)) #endif ................................................................................ ************************************************************************* ** ** This file contains code use to manipulate "Mem" structure. A "Mem" ** stores a single value in the VDBE. Mem is an opaque structure visible ** only within the VDBE. Interface routines refer to a Mem using the ** name sqlite_value ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Call sqlite3VdbeMemExpandBlob() on the supplied value (type Mem*) ** P if required. */ #define expandBlob(P) (((P)->flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0) ................................................................................ preserve = 0; }else{ sqlite3DbFree(pMem->db, pMem->zMalloc); pMem->zMalloc = sqlite3DbMallocRaw(pMem->db, n); } } if( preserve && pMem->z && pMem->zMalloc && pMem->z!=pMem->zMalloc ){ memcpy(pMem->zMalloc, pMem->z, pMem->n); } if( pMem->flags&MEM_Dyn && pMem->xDel ){ pMem->xDel((void *)(pMem->z)); } pMem->z = pMem->zMalloc; ................................................................................ ** result of the aggregate is stored back into pMem. ** ** Return SQLITE_ERROR if the finalizer reports an error. SQLITE_OK ** otherwise. */ SQLITE_PRIVATE int sqlite3VdbeMemFinalize(Mem *pMem, FuncDef *pFunc){ int rc = SQLITE_OK; if( pFunc && pFunc->xFinalize ){ sqlite3_context ctx; assert( (pMem->flags & MEM_Null)!=0 || pFunc==pMem->u.pDef ); assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) ); memset(&ctx, 0, sizeof(ctx)); ctx.s.flags = MEM_Null; ctx.s.db = pMem->db; ctx.pMem = pMem; ctx.pFunc = pFunc; pFunc->xFinalize(&ctx); assert( 0==(pMem->flags&MEM_Dyn) && !pMem->xDel ); sqlite3DbFree(pMem->db, pMem->zMalloc); memcpy(pMem, &ctx.s, sizeof(ctx.s)); rc = (ctx.isError?SQLITE_ERROR:SQLITE_OK); } return rc; } /* ** If the memory cell contains a string value that must be freed by ** invoking an external callback, free it now. Calling this function ................................................................................ SQLITE_PRIVATE void sqlite3VdbeIntegerAffinity(Mem *pMem){ assert( pMem->flags & MEM_Real ); assert( (pMem->flags & MEM_RowSet)==0 ); assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) ); assert( EIGHT_BYTE_ALIGNMENT(pMem) ); pMem->u.i = doubleToInt64(pMem->r); if( pMem->r==(double)pMem->u.i ){ pMem->flags |= MEM_Int; } } /* ** Convert pMem to type integer. Invalidate any prior representations. */ ................................................................................ /* ** Delete any previous value and set the value of pMem to be an ** empty boolean index. */ SQLITE_PRIVATE void sqlite3VdbeMemSetRowSet(Mem *pMem){ sqlite3 *db = pMem->db; assert( db!=0 ); if( pMem->flags & MEM_RowSet ){ sqlite3RowSetClear(pMem->u.pRowSet); }else{ sqlite3VdbeMemRelease(pMem); pMem->zMalloc = sqlite3DbMallocRaw(db, 64); } if( db->mallocFailed ){ pMem->flags = MEM_Null; }else{ assert( pMem->zMalloc ); pMem->u.pRowSet = sqlite3RowSetInit(db, pMem->zMalloc, sqlite3DbMallocSize(db, pMem->zMalloc)); assert( pMem->u.pRowSet!=0 ); ................................................................................ ** Change the value of a Mem to be a string or a BLOB. ** ** The memory management strategy depends on the value of the xDel ** parameter. If the value passed is SQLITE_TRANSIENT, then the ** string is copied into a (possibly existing) buffer managed by the ** Mem structure. Otherwise, any existing buffer is freed and the ** pointer copied. */ SQLITE_PRIVATE int sqlite3VdbeMemSetStr( Mem *pMem, /* Memory cell to set to string value */ const char *z, /* String pointer */ int n, /* Bytes in string, or negative */ u8 enc, /* Encoding of z. 0 for BLOBs */ void (*xDel)(void*) /* Destructor function */ ................................................................................ pMem->xDel = 0; }else{ sqlite3VdbeMemRelease(pMem); pMem->z = (char *)z; pMem->xDel = xDel; flags |= ((xDel==SQLITE_STATIC)?MEM_Static:MEM_Dyn); } if( nByte>iLimit ){ return SQLITE_TOOBIG; } pMem->n = nByte; pMem->flags = flags; pMem->enc = (enc==0 ? SQLITE_UTF8 : enc); pMem->type = (enc==0 ? SQLITE_BLOB : SQLITE_TEXT); #ifndef SQLITE_OMIT_UTF16 if( pMem->enc!=SQLITE_UTF8 && sqlite3VdbeMemHandleBom(pMem) ){ return SQLITE_NOMEM; } #endif return SQLITE_OK; } /* ** Compare the values contained by the two memory cells, returning ** negative, zero or positive if pMem1 is less than, equal to, or greater ................................................................................ if( key ){ zData = (char *)sqlite3BtreeKeyFetch(pCur, &available); }else{ zData = (char *)sqlite3BtreeDataFetch(pCur, &available); } assert( zData!=0 ); if( offset+amt<=available && ((pMem->flags&MEM_Dyn)==0 || pMem->xDel) ){ sqlite3VdbeMemRelease(pMem); pMem->z = &zData[offset]; pMem->flags = MEM_Blob|MEM_Ephem; }else if( SQLITE_OK==(rc = sqlite3VdbeMemGrow(pMem, amt+2, 0)) ){ pMem->flags = MEM_Blob|MEM_Dyn|MEM_Term; pMem->enc = 0; pMem->type = SQLITE_BLOB; ................................................................................ ** ************************************************************************* ** This file contains code used for creating, destroying, and populating ** a VDBE (or an "sqlite3_stmt" as it is known to the outside world.) Prior ** to version 2.8.7, all this code was combined into the vdbe.c source file. ** But that file was getting too big so this subroutines were split out. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** When debugging the code generator in a symbolic debugger, one can ** set the sqlite3VdbeAddopTrace to 1 and all opcodes will be printed ................................................................................ VdbeOp *pOp; i = p->nOp; assert( p->magic==VDBE_MAGIC_INIT ); assert( op>0 && op<0xff ); if( p->nOpAlloc<=i ){ if( growOpArray(p) ){ return 0; } } p->nOp++; pOp = &p->aOp[i]; pOp->opcode = (u8)op; pOp->p5 = 0; pOp->p1 = p1; ................................................................................ SQLITE_PRIVATE int sqlite3VdbeAddOpList(Vdbe *p, int nOp, VdbeOpList const *aOp){ int addr; assert( p->magic==VDBE_MAGIC_INIT ); if( p->nOp + nOp > p->nOpAlloc && growOpArray(p) ){ return 0; } addr = p->nOp; if( nOp>0 ){ int i; VdbeOpList const *pIn = aOp; for(i=0; i<nOp; i++, pIn++){ int p2 = pIn->p2; VdbeOp *pOut = &p->aOp[i+addr]; pOut->opcode = pIn->opcode; pOut->p1 = pIn->p1; ................................................................................ /* ** Change the value of the P1 operand for a specific instruction. ** This routine is useful when a large program is loaded from a ** static array using sqlite3VdbeAddOpList but we want to make a ** few minor changes to the program. */ SQLITE_PRIVATE void sqlite3VdbeChangeP1(Vdbe *p, int addr, int val){ assert( p==0 || p->magic==VDBE_MAGIC_INIT ); if( p && addr>=0 && p->nOp>addr && p->aOp ){ p->aOp[addr].p1 = val; } } /* ** Change the value of the P2 operand for a specific instruction. ** This routine is useful for setting a jump destination. */ SQLITE_PRIVATE void sqlite3VdbeChangeP2(Vdbe *p, int addr, int val){ assert( p==0 || p->magic==VDBE_MAGIC_INIT ); if( p && addr>=0 && p->nOp>addr && p->aOp ){ p->aOp[addr].p2 = val; } } /* ** Change the value of the P3 operand for a specific instruction. */ SQLITE_PRIVATE void sqlite3VdbeChangeP3(Vdbe *p, int addr, int val){ assert( p==0 || p->magic==VDBE_MAGIC_INIT ); if( p && addr>=0 && p->nOp>addr && p->aOp ){ p->aOp[addr].p3 = val; } } /* ** Change the value of the P5 operand for the most recently ** added operation. */ SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe *p, u8 val){ assert( p==0 || p->magic==VDBE_MAGIC_INIT ); if( p && p->aOp ){ assert( p->nOp>0 ); p->aOp[p->nOp-1].p5 = val; } } /* ** Change the P2 operand of instruction addr so that it points to ................................................................................ /* ** If the input FuncDef structure is ephemeral, then free it. If ** the FuncDef is not ephermal, then do nothing. */ static void freeEphemeralFunction(sqlite3 *db, FuncDef *pDef){ if( pDef && (pDef->flags & SQLITE_FUNC_EPHEM)!=0 ){ sqlite3DbFree(db, pDef); } } /* ** Delete a P4 value if necessary. */ ................................................................................ } /* ** Change N opcodes starting at addr to No-ops. */ SQLITE_PRIVATE void sqlite3VdbeChangeToNoop(Vdbe *p, int addr, int N){ if( p && p->aOp ){ VdbeOp *pOp = &p->aOp[addr]; sqlite3 *db = p->db; while( N-- ){ freeP4(db, pOp->p4type, pOp->p4.p); memset(pOp, 0, sizeof(pOp[0])); pOp->opcode = OP_Noop; pOp++; ................................................................................ assert( p->magic==VDBE_MAGIC_INIT ); if( p->aOp==0 || db->mallocFailed ){ if (n != P4_KEYINFO) { freeP4(db, n, (void*)*(char**)&zP4); } return; } assert( addr<p->nOp ); if( addr<0 ){ addr = p->nOp - 1; if( addr<0 ) return; } pOp = &p->aOp[addr]; freeP4(db, pOp->p4type, pOp->p4.p); pOp->p4.p = 0; if( n==P4_INT32 ){ /* Note: this cast is safe, because the origin data point was an int ** that was cast to a (const char *). */ ................................................................................ ** return the most recently inserted opcode. ** ** If a memory allocation error has occurred prior to the calling of this ** routine, then a pointer to a dummy VdbeOp will be returned. That opcode ** is readable and writable, but it has no effect. The return of a dummy ** opcode allows the call to continue functioning after a OOM fault without ** having to check to see if the return from this routine is a valid pointer. */ SQLITE_PRIVATE VdbeOp *sqlite3VdbeGetOp(Vdbe *p, int addr){ static VdbeOp dummy; assert( p->magic==VDBE_MAGIC_INIT ); if( addr<0 ) addr = p->nOp - 1; assert( (addr>=0 && addr<p->nOp) || p->db->mallocFailed ); if( p->db->mallocFailed ){ return &dummy; }else{ return &p->aOp[addr]; } } ................................................................................ if( nByte ){ p->pFree = sqlite3DbMallocRaw(db, nByte); } zCsr = p->pFree; zEnd = &zCsr[nByte]; }while( nByte && !db->mallocFailed ); p->nCursor = nCursor; if( p->aVar ){ p->nVar = nVar; for(n=0; n<nVar; n++){ p->aVar[n].flags = MEM_Null; p->aVar[n].db = db; } } if( p->aMem ){ p->aMem--; /* aMem[] goes from 1..nMem */ ................................................................................ Mem *pColName; int n; sqlite3 *db = p->db; releaseMemArray(p->aColName, p->nResColumn*COLNAME_N); sqlite3DbFree(db, p->aColName); n = nResColumn*COLNAME_N; p->nResColumn = nResColumn; p->aColName = pColName = (Mem*)sqlite3DbMallocZero(db, sizeof(Mem)*n ); if( p->aColName==0 ) return; while( n-- > 0 ){ pColName->flags = MEM_Null; pColName->db = p->db; pColName++; } ................................................................................ ** takes care of the master journal trickery. */ static int vdbeCommit(sqlite3 *db, Vdbe *p){ int i; int nTrans = 0; /* Number of databases with an active write-transaction */ int rc = SQLITE_OK; int needXcommit = 0; /* Before doing anything else, call the xSync() callback for any ** virtual module tables written in this transaction. This has to ** be done before determining whether a master journal file is ** required, as an xSync() callback may add an attached database ** to the transaction. */ ................................................................................ p->magic = VDBE_MAGIC_DEAD; sqlite3DbFree(db, p->aOp); sqlite3DbFree(db, p->pFree); sqlite3DbFree(db, p); } /* ** If a MoveTo operation is pending on the given cursor, then do that ** MoveTo now. Return an error code. If no MoveTo is pending, this ** routine does nothing and returns SQLITE_OK. */ SQLITE_PRIVATE int sqlite3VdbeCursorMoveto(VdbeCursor *p){ if( p->deferredMoveto ){ int res, rc; #ifdef SQLITE_TEST extern int sqlite3_search_count; #endif assert( p->isTable ); rc = sqlite3BtreeMovetoUnpacked(p->pCursor, 0, p->movetoTarget, 0, &res); if( rc ) return rc; p->lastRowid = keyToInt(p->movetoTarget); p->rowidIsValid = ALWAYS(res==0) ?1:0; if( NEVER(res<0) ){ rc = sqlite3BtreeNext(p->pCursor, &res); if( rc ) return rc; } #ifdef SQLITE_TEST sqlite3_search_count++; ................................................................................ } assert( u<=pKeyInfo->nField + 1 ); p->nField = u; return (void*)p; } /* ** This routine destroys a UnpackedRecord object */ SQLITE_PRIVATE void sqlite3VdbeDeleteUnpackedRecord(UnpackedRecord *p){ if( p ){ if( p->flags & UNPACKED_NEED_DESTROY ){ int i; Mem *pMem; for(i=0, pMem=p->aMem; i<p->nField; i++, pMem++){ if( pMem->zMalloc ){ sqlite3VdbeMemRelease(pMem); } } } if( p->flags & UNPACKED_NEED_FREE ){ sqlite3DbFree(p->pKeyInfo->db, p); } } } /* ** This function compares the two table rows or index records ** specified by {nKey1, pKey1} and pPKey2. It returns a negative, zero ** or positive integer if key1 is less than, equal to or ................................................................................ ** pCur points at an index entry created using the OP_MakeRecord opcode. ** Read the rowid (the last field in the record) and store it in *rowid. ** Return SQLITE_OK if everything works, or an error code otherwise. ** ** pCur might be pointing to text obtained from a corrupt database file. ** So the content cannot be trusted. Do appropriate checks on the content. */ SQLITE_PRIVATE int sqlite3VdbeIdxRowid(BtCursor *pCur, i64 *rowid){ i64 nCellKey = 0; int rc; u32 szHdr; /* Size of the header */ u32 typeRowid; /* Serial type of the rowid */ u32 lenRowid; /* Size of the rowid */ Mem m, v; /* Get the size of the index entry. Only indices entries of less ** than 2GiB are support - anything large must be database corruption */ sqlite3BtreeKeySize(pCur, &nCellKey); if( unlikely(nCellKey<=0 || nCellKey>0x7fffffff) ){ return SQLITE_CORRUPT_BKPT; } /* Read in the complete content of the index entry */ m.flags = 0; m.db = 0; m.zMalloc = 0; rc = sqlite3VdbeMemFromBtree(pCur, 0, (int)nCellKey, 1, &m); if( rc ){ return rc; } /* The index entry must begin with a header size */ (void)getVarint32((u8*)m.z, szHdr); testcase( szHdr==2 ); testcase( szHdr==m.n ); if( unlikely(szHdr<2 || (int)szHdr>m.n) ){ goto idx_rowid_corruption; } /* The last field of the index should be an integer - the ROWID. ** Verify that the last entry really is an integer. */ (void)getVarint32((u8*)&m.z[szHdr-1], typeRowid); testcase( typeRowid==1 ); ................................................................................ ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file contains code use to implement APIs that are part of the ** VDBE. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #if 0 && defined(SQLITE_ENABLE_MEMORY_MANAGEMENT) /* ** The following structure contains pointers to the end points of a ** doubly-linked list of all compiled SQL statements that may be holding ** buffers eligible for release when the sqlite3_release_memory() interface is ** invoked. Access to this list is protected by the SQLITE_MUTEX_STATIC_LRU2 ** mutex. ** ** Statements are added to the end of this list when sqlite3_reset() is ** called. They are removed either when sqlite3_step() or sqlite3_finalize() ** is called. When statements are added to this list, the associated ** register array (p->aMem[1..p->nMem]) may contain dynamic buffers that ** can be freed using sqlite3VdbeReleaseMemory(). ** ** When statements are added or removed from this list, the mutex ** associated with the Vdbe being added or removed (Vdbe.db->mutex) is ** already held. The LRU2 mutex is then obtained, blocking if necessary, ** the linked-list pointers manipulated and the LRU2 mutex relinquished. */ struct StatementLruList { Vdbe *pFirst; Vdbe *pLast; }; static struct StatementLruList sqlite3LruStatements; /* ** Check that the list looks to be internally consistent. This is used ** as part of an assert() statement as follows: ** ** assert( stmtLruCheck() ); */ #ifndef NDEBUG static int stmtLruCheck(){ Vdbe *p; for(p=sqlite3LruStatements.pFirst; p; p=p->pLruNext){ assert(p->pLruNext || p==sqlite3LruStatements.pLast); assert(!p->pLruNext || p->pLruNext->pLruPrev==p); assert(p->pLruPrev || p==sqlite3LruStatements.pFirst); assert(!p->pLruPrev || p->pLruPrev->pLruNext==p); } return 1; } #endif /* ** Add vdbe p to the end of the statement lru list. It is assumed that ** p is not already part of the list when this is called. The lru list ** is protected by the SQLITE_MUTEX_STATIC_LRU mutex. */ static void stmtLruAdd(Vdbe *p){ sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_LRU2)); if( p->pLruPrev || p->pLruNext || sqlite3LruStatements.pFirst==p ){ sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_LRU2)); return; } assert( stmtLruCheck() ); if( !sqlite3LruStatements.pFirst ){ assert( !sqlite3LruStatements.pLast ); sqlite3LruStatements.pFirst = p; sqlite3LruStatements.pLast = p; }else{ assert( !sqlite3LruStatements.pLast->pLruNext ); p->pLruPrev = sqlite3LruStatements.pLast; sqlite3LruStatements.pLast->pLruNext = p; sqlite3LruStatements.pLast = p; } assert( stmtLruCheck() ); sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_LRU2)); } /* ** Assuming the SQLITE_MUTEX_STATIC_LRU2 mutext is already held, remove ** statement p from the least-recently-used statement list. If the ** statement is not currently part of the list, this call is a no-op. */ static void stmtLruRemoveNomutex(Vdbe *p){ if( p->pLruPrev || p->pLruNext || p==sqlite3LruStatements.pFirst ){ assert( stmtLruCheck() ); if( p->pLruNext ){ p->pLruNext->pLruPrev = p->pLruPrev; }else{ sqlite3LruStatements.pLast = p->pLruPrev; } if( p->pLruPrev ){ p->pLruPrev->pLruNext = p->pLruNext; }else{ sqlite3LruStatements.pFirst = p->pLruNext; } p->pLruNext = 0; p->pLruPrev = 0; assert( stmtLruCheck() ); } } /* ** Assuming the SQLITE_MUTEX_STATIC_LRU2 mutext is not held, remove ** statement p from the least-recently-used statement list. If the ** statement is not currently part of the list, this call is a no-op. */ static void stmtLruRemove(Vdbe *p){ sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_LRU2)); stmtLruRemoveNomutex(p); sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_LRU2)); } /* ** Try to release n bytes of memory by freeing buffers associated ** with the memory registers of currently unused vdbes. */ SQLITE_PRIVATE int sqlite3VdbeReleaseMemory(int n){ Vdbe *p; Vdbe *pNext; int nFree = 0; sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_LRU2)); for(p=sqlite3LruStatements.pFirst; p && nFree<n; p=pNext){ pNext = p->pLruNext; /* For each statement handle in the lru list, attempt to obtain the ** associated database mutex. If it cannot be obtained, continue ** to the next statement handle. It is not possible to block on ** the database mutex - that could cause deadlock. */ if( SQLITE_OK==sqlite3_mutex_try(p->db->mutex) ){ nFree += sqlite3VdbeReleaseBuffers(p); stmtLruRemoveNomutex(p); sqlite3_mutex_leave(p->db->mutex); } } sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_LRU2)); return nFree; } /* ** Call sqlite3Reprepare() on the statement. Remove it from the ** lru list before doing so, as Reprepare() will free all the ** memory register buffers anyway. */ int vdbeReprepare(Vdbe *p){ stmtLruRemove(p); return sqlite3Reprepare(p); } #else /* !SQLITE_ENABLE_MEMORY_MANAGEMENT */ #define stmtLruRemove(x) #define stmtLruAdd(x) #define vdbeReprepare(x) sqlite3Reprepare(x) #endif #ifndef SQLITE_OMIT_DEPRECATED /* ** Return TRUE (non-zero) of the statement supplied as an argument needs ** to be recompiled. A statement needs to be recompiled whenever the ** execution environment changes in a way that would alter the program ** that sqlite3_prepare() generates. For example, if new functions or ................................................................................ }else{ Vdbe *v = (Vdbe*)pStmt; sqlite3 *db = v->db; #if SQLITE_THREADSAFE sqlite3_mutex *mutex = v->db->mutex; #endif sqlite3_mutex_enter(mutex); stmtLruRemove(v); rc = sqlite3VdbeFinalize(v); rc = sqlite3ApiExit(db, rc); sqlite3_mutex_leave(mutex); } return rc; } ................................................................................ int rc; if( pStmt==0 ){ rc = SQLITE_OK; }else{ Vdbe *v = (Vdbe*)pStmt; sqlite3_mutex_enter(v->db->mutex); rc = sqlite3VdbeReset(v); stmtLruAdd(v); sqlite3VdbeMakeReady(v, -1, 0, 0, 0); assert( (rc & (v->db->errMask))==rc ); rc = sqlite3ApiExit(v->db, rc); sqlite3_mutex_leave(v->db->mutex); } return rc; } ................................................................................ SQLITE_API int sqlite3_value_type(sqlite3_value* pVal){ return pVal->type; } /**************************** sqlite3_result_ ******************************* ** The following routines are used by user-defined functions to specify ** the function result. */ SQLITE_API void sqlite3_result_blob( sqlite3_context *pCtx, const void *z, int n, void (*xDel)(void *) ){ assert( n>=0 ); assert( sqlite3_mutex_held(pCtx->s.db->mutex) ); sqlite3VdbeMemSetStr(&pCtx->s, z, n, 0, xDel); } SQLITE_API void sqlite3_result_double(sqlite3_context *pCtx, double rVal){ assert( sqlite3_mutex_held(pCtx->s.db->mutex) ); sqlite3VdbeMemSetDouble(&pCtx->s, rVal); } SQLITE_API void sqlite3_result_error(sqlite3_context *pCtx, const char *z, int n){ assert( sqlite3_mutex_held(pCtx->s.db->mutex) ); ................................................................................ SQLITE_API void sqlite3_result_text( sqlite3_context *pCtx, const char *z, int n, void (*xDel)(void *) ){ assert( sqlite3_mutex_held(pCtx->s.db->mutex) ); sqlite3VdbeMemSetStr(&pCtx->s, z, n, SQLITE_UTF8, xDel); } #ifndef SQLITE_OMIT_UTF16 SQLITE_API void sqlite3_result_text16( sqlite3_context *pCtx, const void *z, int n, void (*xDel)(void *) ){ assert( sqlite3_mutex_held(pCtx->s.db->mutex) ); sqlite3VdbeMemSetStr(&pCtx->s, z, n, SQLITE_UTF16NATIVE, xDel); } SQLITE_API void sqlite3_result_text16be( sqlite3_context *pCtx, const void *z, int n, void (*xDel)(void *) ){ assert( sqlite3_mutex_held(pCtx->s.db->mutex) ); sqlite3VdbeMemSetStr(&pCtx->s, z, n, SQLITE_UTF16BE, xDel); } SQLITE_API void sqlite3_result_text16le( sqlite3_context *pCtx, const void *z, int n, void (*xDel)(void *) ){ assert( sqlite3_mutex_held(pCtx->s.db->mutex) ); sqlite3VdbeMemSetStr(&pCtx->s, z, n, SQLITE_UTF16LE, xDel); } #endif /* SQLITE_OMIT_UTF16 */ SQLITE_API void sqlite3_result_value(sqlite3_context *pCtx, sqlite3_value *pValue){ assert( sqlite3_mutex_held(pCtx->s.db->mutex) ); sqlite3VdbeMemCopy(&pCtx->s, pValue); } SQLITE_API void sqlite3_result_zeroblob(sqlite3_context *pCtx, int n){ ................................................................................ p->startTime = (u64)((rNow - (int)rNow)*3600.0*24.0*1000000000.0); } #endif db->activeVdbeCnt++; if( p->readOnly==0 ) db->writeVdbeCnt++; p->pc = 0; stmtLruRemove(p); } #ifndef SQLITE_OMIT_EXPLAIN if( p->explain ){ rc = sqlite3VdbeList(p); }else #endif /* SQLITE_OMIT_EXPLAIN */ { ................................................................................ } /* ** This is the top-level implementation of sqlite3_step(). Call ** sqlite3Step() to do most of the work. If a schema error occurs, ** call sqlite3Reprepare() and try again. */ #ifdef SQLITE_OMIT_PARSER SQLITE_API int sqlite3_step(sqlite3_stmt *pStmt){ int rc = SQLITE_MISUSE; if( pStmt ){ Vdbe *v; v = (Vdbe*)pStmt; sqlite3_mutex_enter(v->db->mutex); rc = sqlite3Step(v); sqlite3_mutex_leave(v->db->mutex); } return rc; } #else SQLITE_API int sqlite3_step(sqlite3_stmt *pStmt){ int rc = SQLITE_MISUSE; if( pStmt ){ int cnt = 0; Vdbe *v = (Vdbe*)pStmt; sqlite3 *db = v->db; sqlite3_mutex_enter(db->mutex); while( (rc = sqlite3Step(v))==SQLITE_SCHEMA && cnt++ < 5 && (rc = vdbeReprepare(v))==SQLITE_OK ){ sqlite3_reset(pStmt); v->expired = 0; } if( rc==SQLITE_SCHEMA && ALWAYS(v->isPrepareV2) && ALWAYS(db->pErr) ){ /* This case occurs after failing to recompile an sql statement. ** The error message from the SQL compiler has already been loaded ** into the database handle. This block copies the error message ................................................................................ } } rc = sqlite3ApiExit(db, rc); sqlite3_mutex_leave(db->mutex); } return rc; } #endif /* ** Extract the user data from a sqlite3_context structure and return a ** pointer to it. */ SQLITE_API void *sqlite3_user_data(sqlite3_context *p){ assert( p && p->pFunc ); ................................................................................ ** ** Various scripts scan this source file in order to generate HTML ** documentation, headers files, or other derived files. The formatting ** of the code in this file is, therefore, important. See other comments ** in this file for details. If in doubt, do not deviate from existing ** commenting and indentation practices when changing or adding code. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** The following global variable is incremented every time a cursor ** moves, either by the OP_SeekXX, OP_Next, or OP_Prev opcodes. The test ** procedures use this information to make sure that indices are ** working correctly. This variable has no function other than to ................................................................................ ** if we run out of memory. */ static VdbeCursor *allocateCursor( Vdbe *p, /* The virtual machine */ int iCur, /* Index of the new VdbeCursor */ int nField, /* Number of fields in the table or index */ int iDb, /* When database the cursor belongs to, or -1 */ int isBtreeCursor /* */ ){ /* Find the memory cell that will be used to store the blob of memory ** required for this VdbeCursor structure. It is convenient to use a ** vdbe memory cell to manage the memory allocation required for a ** VdbeCursor structure for the following reasons: ** ** * Sometimes cursor numbers are used for a couple of different ................................................................................ static void memTracePrint(FILE *out, Mem *p){ if( p->flags & MEM_Null ){ fprintf(out, " NULL"); }else if( (p->flags & (MEM_Int|MEM_Str))==(MEM_Int|MEM_Str) ){ fprintf(out, " si:%lld", p->u.i); }else if( p->flags & MEM_Int ){ fprintf(out, " i:%lld", p->u.i); }else if( p->flags & MEM_Real ){ fprintf(out, " r:%g", p->r); }else if( p->flags & MEM_RowSet ){ fprintf(out, " (rowset)"); }else{ char zBuf[200]; sqlite3VdbeMemPrettyPrint(p, zBuf); fprintf(out, " "); fprintf(out, "%s", zBuf); ................................................................................ ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains inline asm code for retrieving "high-performance" ** counters for x86 class CPUs. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _HWTIME_H_ #define _HWTIME_H_ /* ** The following routine only works on pentium-class (or newer) processors. ** It uses the RDTSC opcode to read the cycle count value out of the ................................................................................ struct OP_Or_stack_vars { int v1; /* Left operand: 0==FALSE, 1==TRUE, 2==UNKNOWN or NULL */ int v2; /* Right operand: 0==FALSE, 1==TRUE, 2==UNKNOWN or NULL */ } ak; struct OP_IfNot_stack_vars { int c; } al; struct OP_IsNull_stack_vars { int n; } am; struct OP_Column_stack_vars { u32 payloadSize; /* Number of bytes in the record */ i64 payloadSize64; /* Number of bytes in the record */ int p1; /* P1 value of the opcode */ int p2; /* column number to retrieve */ VdbeCursor *pC; /* The VDBE cursor */ char *zRec; /* Pointer to complete record-data */ ................................................................................ Mem sMem; /* For storing the record being decoded */ u8 *zIdx; /* Index into header */ u8 *zEndHdr; /* Pointer to first byte after the header */ u32 offset; /* Offset into the data */ u64 offset64; /* 64-bit offset. 64 bits needed to catch overflow */ int szHdr; /* Size of the header size field at start of record */ int avail; /* Number of bytes of available data */ } an; struct OP_Affinity_stack_vars { char *zAffinity; /* The affinity to be applied */ Mem *pData0; /* First register to which to apply affinity */ Mem *pLast; /* Last register to which to apply affinity */ Mem *pRec; /* Current register */ } ao; struct OP_MakeRecord_stack_vars { u8 *zNewRecord; /* A buffer to hold the data for the new record */ Mem *pRec; /* The new record */ u64 nData; /* Number of bytes of data space */ int nHdr; /* Number of bytes of header space */ i64 nByte; /* Data space required for this record */ int nZero; /* Number of zero bytes at the end of the record */ ................................................................................ Mem *pData0; /* First field to be combined into the record */ Mem *pLast; /* Last field of the record */ int nField; /* Number of fields in the record */ char *zAffinity; /* The affinity string for the record */ int file_format; /* File format to use for encoding */ int i; /* Space used in zNewRecord[] */ int len; /* Length of a field */ } ap; struct OP_Count_stack_vars { i64 nEntry; BtCursor *pCrsr; } aq; struct OP_Statement_stack_vars { int i; Btree *pBt; } ar; struct OP_Savepoint_stack_vars { int p1; /* Value of P1 operand */ char *zName; /* Name of savepoint */ int nName; Savepoint *pNew; Savepoint *pSavepoint; Savepoint *pTmp; int iSavepoint; int ii; } as; struct OP_AutoCommit_stack_vars { int desiredAutoCommit; int iRollback; int turnOnAC; } at; struct OP_Transaction_stack_vars { int i; Btree *pBt; } au; struct OP_ReadCookie_stack_vars { int iMeta; int iDb; int iCookie; } av; struct OP_SetCookie_stack_vars { Db *pDb; } aw; struct OP_VerifyCookie_stack_vars { int iMeta; Btree *pBt; } ax; struct OP_OpenWrite_stack_vars { int nField; KeyInfo *pKeyInfo; int i; int p2; int iDb; int wrFlag; Btree *pX; VdbeCursor *pCur; Db *pDb; int flags; } ay; struct OP_OpenEphemeral_stack_vars { int i; VdbeCursor *pCx; } az; struct OP_OpenPseudo_stack_vars { int i; VdbeCursor *pCx; } ba; struct OP_Close_stack_vars { int i; } bb; struct OP_SeekGt_stack_vars { int i; int res; int oc; VdbeCursor *pC; UnpackedRecord r; int nField; i64 iKey; /* The rowid we are to seek to */ } bc; struct OP_Seek_stack_vars { int i; VdbeCursor *pC; } bd; struct OP_Found_stack_vars { int i; int alreadyExists; VdbeCursor *pC; int res; UnpackedRecord *pIdxKey; char aTempRec[ROUND8(sizeof(UnpackedRecord)) + sizeof(Mem)*3 + 7]; } be; struct OP_IsUnique_stack_vars { u16 ii; VdbeCursor *pCx; BtCursor *pCrsr; u16 nField; Mem *aMem; UnpackedRecord r; /* B-Tree index search key */ i64 R; /* Rowid stored in register P3 */ } bf; struct OP_NotExists_stack_vars { int i; VdbeCursor *pC; BtCursor *pCrsr; int res; u64 iKey; } bg; struct OP_NewRowid_stack_vars { int i; i64 v; VdbeCursor *pC; int res; int rx; int cnt; i64 x; Mem *pMem; } bh; struct OP_Insert_stack_vars { Mem *pData; Mem *pKey; i64 iKey; /* The integer ROWID or key for the record to be inserted */ int i; VdbeCursor *pC; int nZero; int seekResult; const char *zDb; const char *zTbl; int op; } bi; struct OP_Delete_stack_vars { int i; i64 iKey; VdbeCursor *pC; } bj; struct OP_RowData_stack_vars { int i; VdbeCursor *pC; BtCursor *pCrsr; u32 n; i64 n64; } bk; struct OP_Rowid_stack_vars { int i; VdbeCursor *pC; i64 v; sqlite3_vtab *pVtab; const sqlite3_module *pModule; } bl; struct OP_NullRow_stack_vars { int i; VdbeCursor *pC; } bm; struct OP_Last_stack_vars { int i; VdbeCursor *pC; BtCursor *pCrsr; int res; } bn; struct OP_Rewind_stack_vars { int i; VdbeCursor *pC; BtCursor *pCrsr; int res; } bo; struct OP_Next_stack_vars { VdbeCursor *pC; BtCursor *pCrsr; int res; } bp; struct OP_IdxInsert_stack_vars { int i; VdbeCursor *pC; BtCursor *pCrsr; int nKey; const char *zKey; } bq; struct OP_IdxDelete_stack_vars { int i; VdbeCursor *pC; BtCursor *pCrsr; } br; struct OP_IdxRowid_stack_vars { int i; BtCursor *pCrsr; VdbeCursor *pC; i64 rowid; } bs; struct OP_IdxGE_stack_vars { int i; VdbeCursor *pC; int res; UnpackedRecord r; } bt; struct OP_Destroy_stack_vars { int iMoved; int iCnt; Vdbe *pVdbe; int iDb; } bu; struct OP_Clear_stack_vars { int nChange; } bv; struct OP_CreateTable_stack_vars { int pgno; int flags; Db *pDb; } bw; struct OP_ParseSchema_stack_vars { int iDb; const char *zMaster; char *zSql; InitData initData; } bx; struct OP_IntegrityCk_stack_vars { int nRoot; /* Number of tables to check. (Number of root pages.) */ int *aRoot; /* Array of rootpage numbers for tables to be checked */ int j; /* Loop counter */ int nErr; /* Number of errors reported */ char *z; /* Text of the error report */ Mem *pnErr; /* Register keeping track of errors remaining */ } by; struct OP_RowSetAdd_stack_vars { Mem *pIdx; Mem *pVal; } bz; struct OP_RowSetRead_stack_vars { Mem *pIdx; i64 val; } ca; struct OP_RowSetTest_stack_vars { int iSet; int exists; } cb; struct OP_ContextPush_stack_vars { int i; Context *pContext; } cc; struct OP_ContextPop_stack_vars { Context *pContext; } cd; struct OP_AggStep_stack_vars { int n; int i; Mem *pMem; Mem *pRec; sqlite3_context ctx; sqlite3_value **apVal; } ce; struct OP_AggFinal_stack_vars { Mem *pMem; } cf; struct OP_IncrVacuum_stack_vars { Btree *pBt; } cg; struct OP_TableLock_stack_vars { int p1; u8 isWriteLock; } ch; struct OP_VBegin_stack_vars { sqlite3_vtab *pVtab; } ci; struct OP_VOpen_stack_vars { VdbeCursor *pCur; sqlite3_vtab_cursor *pVtabCursor; sqlite3_vtab *pVtab; sqlite3_module *pModule; } cj; struct OP_VFilter_stack_vars { int nArg; int iQuery; const sqlite3_module *pModule; Mem *pQuery; Mem *pArgc; sqlite3_vtab_cursor *pVtabCursor; sqlite3_vtab *pVtab; VdbeCursor *pCur; int res; int i; Mem **apArg; } ck; struct OP_VColumn_stack_vars { sqlite3_vtab *pVtab; const sqlite3_module *pModule; Mem *pDest; sqlite3_context sContext; } cl; struct OP_VNext_stack_vars { sqlite3_vtab *pVtab; const sqlite3_module *pModule; int res; VdbeCursor *pCur; } cm; struct OP_VRename_stack_vars { sqlite3_vtab *pVtab; Mem *pName; } cn; struct OP_VUpdate_stack_vars { sqlite3_vtab *pVtab; sqlite3_module *pModule; int nArg; int i; sqlite_int64 rowid; Mem **apArg; Mem *pX; } co; struct OP_Pagecount_stack_vars { int p1; int nPage; Pager *pPager; } cp; struct OP_Trace_stack_vars { char *zTrace; } cq; } u; /* End automatically generated code ********************************************************************/ assert( p->magic==VDBE_MAGIC_RUN ); /* sqlite3_step() verifies this */ assert( db->magic==SQLITE_MAGIC_BUSY ); sqlite3VdbeMutexArrayEnter(p); ................................................................................ ** There is an implied "Halt 0 0 0" instruction inserted at the very end of ** every program. So a jump past the last instruction of the program ** is the same as executing Halt. */ case OP_Halt: { p->rc = pOp->p1; p->pc = pc; p->errorAction = pOp->p2; if( pOp->p4.z ){ sqlite3SetString(&p->zErrMsg, db, "%s", pOp->p4.z); } rc = sqlite3VdbeHalt(p); assert( rc==SQLITE_BUSY || rc==SQLITE_OK ); if( rc==SQLITE_BUSY ){ p->rc = rc = SQLITE_BUSY; ................................................................................ case OP_String8: { /* same as TK_STRING, out2-prerelease */ assert( pOp->p4.z!=0 ); pOp->opcode = OP_String; pOp->p1 = sqlite3Strlen30(pOp->p4.z); #ifndef SQLITE_OMIT_UTF16 if( encoding!=SQLITE_UTF8 ){ sqlite3VdbeMemSetStr(pOut, pOp->p4.z, -1, SQLITE_UTF8, SQLITE_STATIC); if( SQLITE_OK!=sqlite3VdbeChangeEncoding(pOut, encoding) ) goto no_mem; if( SQLITE_OK!=sqlite3VdbeMemMakeWriteable(pOut) ) goto no_mem; pOut->zMalloc = 0; pOut->flags |= MEM_Static; pOut->flags &= ~MEM_Dyn; if( pOp->p4type==P4_DYNAMIC ){ sqlite3DbFree(db, pOp->p4.z); } pOp->p4type = P4_DYNAMIC; pOp->p4.z = pOut->z; pOp->p1 = pOut->n; if( pOp->p1>db->aLimit[SQLITE_LIMIT_LENGTH] ){ goto too_big; } UPDATE_MAX_BLOBSIZE(pOut); break; } #endif if( pOp->p1>db->aLimit[SQLITE_LIMIT_LENGTH] ){ goto too_big; } /* Fall through to the next case, OP_String */ } ................................................................................ ** ** In case this is such a statement, close any statement transaction ** opened by this VM before returning control to the user. This is to ** ensure that statement-transactions are always nested, not overlapping. ** If the open statement-transaction is not closed here, then the user ** may step another VM that opens its own statement transaction. This ** may lead to overlapping statement transactions. */ assert( p->iStatement==0 || db->flags&SQLITE_CountRows ); if( SQLITE_OK!=(rc = sqlite3VdbeCloseStatement(p, SAVEPOINT_RELEASE)) ){ break; } /* Invalidate all ephemeral cursor row caches */ p->cacheCtr = (p->cacheCtr + 2)|1; /* Make sure the results of the current row are \000 terminated ................................................................................ #endif /* local variables moved into u.ae */ assert( pIn1!=pOut ); if( (pIn1->flags | pIn2->flags) & MEM_Null ){ sqlite3VdbeMemSetNull(pOut); break; } ExpandBlob(pIn1); Stringify(pIn1, encoding); ExpandBlob(pIn2); Stringify(pIn2, encoding); u.ae.nByte = pIn1->n + pIn2->n; if( u.ae.nByte>db->aLimit[SQLITE_LIMIT_LENGTH] ){ goto too_big; } MemSetTypeFlag(pOut, MEM_Str); if( sqlite3VdbeMemGrow(pOut, (int)u.ae.nByte+2, pOut==pIn2) ){ ................................................................................ } if( u.al.c ){ pc = pOp->p2-1; } break; } /* Opcode: IsNull P1 P2 P3 * * ** ** Jump to P2 if the value in register P1 is NULL. If P3 is greater ** than zero, then check all values reg(P1), reg(P1+1), ** reg(P1+2), ..., reg(P1+P3-1). */ case OP_IsNull: { /* same as TK_ISNULL, jump, in1 */ #if 0 /* local variables moved into u.am */ int n; #endif /* local variables moved into u.am */ u.am.n = pOp->p3; assert( pOp->p3==0 || pOp->p1>0 ); do{ if( (pIn1->flags & MEM_Null)!=0 ){ pc = pOp->p2 - 1; break; } pIn1++; }while( --u.am.n > 0 ); break; } /* Opcode: NotNull P1 P2 * * * ** ** Jump to P2 if the value in register P1 is not NULL. */ ................................................................................ ** The value extracted is stored in register P3. ** ** If the column contains fewer than P2 fields, then extract a NULL. Or, ** if the P4 argument is a P4_MEM use the value of the P4 argument as ** the result. */ case OP_Column: { #if 0 /* local variables moved into u.an */ u32 payloadSize; /* Number of bytes in the record */ i64 payloadSize64; /* Number of bytes in the record */ int p1; /* P1 value of the opcode */ int p2; /* column number to retrieve */ VdbeCursor *pC; /* The VDBE cursor */ char *zRec; /* Pointer to complete record-data */ BtCursor *pCrsr; /* The BTree cursor */ ................................................................................ Mem sMem; /* For storing the record being decoded */ u8 *zIdx; /* Index into header */ u8 *zEndHdr; /* Pointer to first byte after the header */ u32 offset; /* Offset into the data */ u64 offset64; /* 64-bit offset. 64 bits needed to catch overflow */ int szHdr; /* Size of the header size field at start of record */ int avail; /* Number of bytes of available data */ #endif /* local variables moved into u.an */ u.an.p1 = pOp->p1; u.an.p2 = pOp->p2; u.an.pC = 0; memset(&u.an.sMem, 0, sizeof(u.an.sMem)); assert( u.an.p1<p->nCursor ); assert( pOp->p3>0 && pOp->p3<=p->nMem ); u.an.pDest = &p->aMem[pOp->p3]; MemSetTypeFlag(u.an.pDest, MEM_Null); /* This block sets the variable u.an.payloadSize to be the total number of ** bytes in the record. ** ** u.an.zRec is set to be the complete text of the record if it is available. ** The complete record text is always available for pseudo-tables ** If the record is stored in a cursor, the complete record text ** might be available in the u.an.pC->aRow cache. Or it might not be. ** If the data is unavailable, u.an.zRec is set to NULL. ** ** We also compute the number of columns in the record. For cursors, ** the number of columns is stored in the VdbeCursor.nField element. */ u.an.pC = p->apCsr[u.an.p1]; assert( u.an.pC!=0 ); #ifndef SQLITE_OMIT_VIRTUALTABLE assert( u.an.pC->pVtabCursor==0 ); #endif if( u.an.pC->pCursor!=0 ){ /* The record is stored in a B-Tree */ rc = sqlite3VdbeCursorMoveto(u.an.pC); if( rc ) goto abort_due_to_error; u.an.zRec = 0; u.an.pCrsr = u.an.pC->pCursor; if( u.an.pC->nullRow ){ u.an.payloadSize = 0; }else if( u.an.pC->cacheStatus==p->cacheCtr ){ u.an.payloadSize = u.an.pC->payloadSize; u.an.zRec = (char*)u.an.pC->aRow; }else if( u.an.pC->isIndex ){ sqlite3BtreeKeySize(u.an.pCrsr, &u.an.payloadSize64); if( (u.an.payloadSize64 & SQLITE_MAX_U32)!=(u64)u.an.payloadSize64 ){ rc = SQLITE_CORRUPT_BKPT; goto abort_due_to_error; } u.an.payloadSize = (u32)u.an.payloadSize64; }else{ sqlite3BtreeDataSize(u.an.pCrsr, &u.an.payloadSize); } u.an.nField = u.an.pC->nField; }else{ assert( u.an.pC->pseudoTable ); /* The record is the sole entry of a pseudo-table */ u.an.payloadSize = u.an.pC->nData; u.an.zRec = u.an.pC->pData; u.an.pC->cacheStatus = CACHE_STALE; assert( u.an.payloadSize==0 || u.an.zRec!=0 ); u.an.nField = u.an.pC->nField; u.an.pCrsr = 0; } /* If u.an.payloadSize is 0, then just store a NULL */ if( u.an.payloadSize==0 ){ assert( u.an.pDest->flags&MEM_Null ); goto op_column_out; } assert( db->aLimit[SQLITE_LIMIT_LENGTH]>=0 ); if( u.an.payloadSize > (u32)db->aLimit[SQLITE_LIMIT_LENGTH] ){ goto too_big; } assert( u.an.p2<u.an.nField ); /* Read and parse the table header. Store the results of the parse ** into the record header cache fields of the cursor. */ u.an.aType = u.an.pC->aType; if( u.an.pC->cacheStatus==p->cacheCtr ){ u.an.aOffset = u.an.pC->aOffset; }else{ assert(u.an.aType); u.an.avail = 0; u.an.pC->aOffset = u.an.aOffset = &u.an.aType[u.an.nField]; u.an.pC->payloadSize = u.an.payloadSize; u.an.pC->cacheStatus = p->cacheCtr; /* Figure out how many bytes are in the header */ if( u.an.zRec ){ u.an.zData = u.an.zRec; }else{ if( u.an.pC->isIndex ){ u.an.zData = (char*)sqlite3BtreeKeyFetch(u.an.pCrsr, &u.an.avail); }else{ u.an.zData = (char*)sqlite3BtreeDataFetch(u.an.pCrsr, &u.an.avail); } /* If KeyFetch()/DataFetch() managed to get the entire payload, ** save the payload in the u.an.pC->aRow cache. That will save us from ** having to make additional calls to fetch the content portion of ** the record. */ assert( u.an.avail>=0 ); if( u.an.payloadSize <= (u32)u.an.avail ){ u.an.zRec = u.an.zData; u.an.pC->aRow = (u8*)u.an.zData; }else{ u.an.pC->aRow = 0; } } /* The following assert is true in all cases accept when ** the database file has been corrupted externally. ** assert( u.an.zRec!=0 || u.an.avail>=u.an.payloadSize || u.an.avail>=9 ); */ u.an.szHdr = getVarint32((u8*)u.an.zData, u.an.offset); /* Make sure a corrupt database has not given us an oversize header. ** Do this now to avoid an oversize memory allocation. ** ** Type entries can be between 1 and 5 bytes each. But 4 and 5 byte ** types use so much data space that there can only be 4096 and 32 of ** them, respectively. So the maximum header length results from a ** 3-byte type for each of the maximum of 32768 columns plus three ** extra bytes for the header length itself. 32768*3 + 3 = 98307. */ if( u.an.offset > 98307 ){ rc = SQLITE_CORRUPT_BKPT; goto op_column_out; } /* Compute in u.an.len the number of bytes of data we need to read in order ** to get u.an.nField type values. u.an.offset is an upper bound on this. But ** u.an.nField might be significantly less than the true number of columns ** in the table, and in that case, 5*u.an.nField+3 might be smaller than u.an.offset. ** We want to minimize u.an.len in order to limit the size of the memory ** allocation, especially if a corrupt database file has caused u.an.offset ** to be oversized. Offset is limited to 98307 above. But 98307 might ** still exceed Robson memory allocation limits on some configurations. ** On systems that cannot tolerate large memory allocations, u.an.nField*5+3 ** will likely be much smaller since u.an.nField will likely be less than ** 20 or so. This insures that Robson memory allocation limits are ** not exceeded even for corrupt database files. */ u.an.len = u.an.nField*5 + 3; if( u.an.len > (int)u.an.offset ) u.an.len = (int)u.an.offset; /* The KeyFetch() or DataFetch() above are fast and will get the entire ** record header in most cases. But they will fail to get the complete ** record header if the record header does not fit on a single page ** in the B-Tree. When that happens, use sqlite3VdbeMemFromBtree() to ** acquire the complete header text. */ if( !u.an.zRec && u.an.avail<u.an.len ){ u.an.sMem.flags = 0; u.an.sMem.db = 0; rc = sqlite3VdbeMemFromBtree(u.an.pCrsr, 0, u.an.len, u.an.pC->isIndex, &u.an.sMem); if( rc!=SQLITE_OK ){ goto op_column_out; } u.an.zData = u.an.sMem.z; } u.an.zEndHdr = (u8 *)&u.an.zData[u.an.len]; u.an.zIdx = (u8 *)&u.an.zData[u.an.szHdr]; /* Scan the header and use it to fill in the u.an.aType[] and u.an.aOffset[] ** arrays. u.an.aType[u.an.i] will contain the type integer for the u.an.i-th ** column and u.an.aOffset[u.an.i] will contain the u.an.offset from the beginning ** of the record to the start of the data for the u.an.i-th column */ u.an.offset64 = u.an.offset; for(u.an.i=0; u.an.i<u.an.nField; u.an.i++){ if( u.an.zIdx<u.an.zEndHdr ){ u.an.aOffset[u.an.i] = (u32)u.an.offset64; u.an.zIdx += getVarint32(u.an.zIdx, u.an.aType[u.an.i]); u.an.offset64 += sqlite3VdbeSerialTypeLen(u.an.aType[u.an.i]); }else{ /* If u.an.i is less that u.an.nField, then there are less fields in this ** record than SetNumColumns indicated there are columns in the ** table. Set the u.an.offset for any extra columns not present in ** the record to 0. This tells code below to store a NULL ** instead of deserializing a value from the record. */ u.an.aOffset[u.an.i] = 0; } } sqlite3VdbeMemRelease(&u.an.sMem); u.an.sMem.flags = MEM_Null; /* If we have read more header data than was contained in the header, ** or if the end of the last field appears to be past the end of the ** record, or if the end of the last field appears to be before the end ** of the record (when all fields present), then we must be dealing ** with a corrupt database. */ if( (u.an.zIdx > u.an.zEndHdr)|| (u.an.offset64 > u.an.payloadSize) || (u.an.zIdx==u.an.zEndHdr && u.an.offset64!=(u64)u.an.payloadSize) ){ rc = SQLITE_CORRUPT_BKPT; goto op_column_out; } } /* Get the column information. If u.an.aOffset[u.an.p2] is non-zero, then ** deserialize the value from the record. If u.an.aOffset[u.an.p2] is zero, ** then there are not enough fields in the record to satisfy the ** request. In this case, set the value NULL or to P4 if P4 is ** a pointer to a Mem object. */ if( u.an.aOffset[u.an.p2] ){ assert( rc==SQLITE_OK ); if( u.an.zRec ){ sqlite3VdbeMemReleaseExternal(u.an.pDest); sqlite3VdbeSerialGet((u8 *)&u.an.zRec[u.an.aOffset[u.an.p2]], u.an.aType[u.an.p2], u.an.pDest); }else{ u.an.len = sqlite3VdbeSerialTypeLen(u.an.aType[u.an.p2]); sqlite3VdbeMemMove(&u.an.sMem, u.an.pDest); rc = sqlite3VdbeMemFromBtree(u.an.pCrsr, u.an.aOffset[u.an.p2], u.an.len, u.an.pC->isIndex, &u.an.sMem); if( rc!=SQLITE_OK ){ goto op_column_out; } u.an.zData = u.an.sMem.z; sqlite3VdbeSerialGet((u8*)u.an.zData, u.an.aType[u.an.p2], u.an.pDest); } u.an.pDest->enc = encoding; }else{ if( pOp->p4type==P4_MEM ){ sqlite3VdbeMemShallowCopy(u.an.pDest, pOp->p4.pMem, MEM_Static); }else{ assert( u.an.pDest->flags&MEM_Null ); } } /* If we dynamically allocated space to hold the data (in the ** sqlite3VdbeMemFromBtree() call above) then transfer control of that ** dynamically allocated space over to the u.an.pDest structure. ** This prevents a memory copy. */ if( u.an.sMem.zMalloc ){ assert( u.an.sMem.z==u.an.sMem.zMalloc ); assert( !(u.an.pDest->flags & MEM_Dyn) ); assert( !(u.an.pDest->flags & (MEM_Blob|MEM_Str)) || u.an.pDest->z==u.an.sMem.z ); u.an.pDest->flags &= ~(MEM_Ephem|MEM_Static); u.an.pDest->flags |= MEM_Term; u.an.pDest->z = u.an.sMem.z; u.an.pDest->zMalloc = u.an.sMem.zMalloc; } rc = sqlite3VdbeMemMakeWriteable(u.an.pDest); op_column_out: UPDATE_MAX_BLOBSIZE(u.an.pDest); REGISTER_TRACE(pOp->p3, u.an.pDest); break; } /* Opcode: Affinity P1 P2 * P4 * ** ** Apply affinities to a range of P2 registers starting with P1. ** ** P4 is a string that is P2 characters long. The nth character of the ** string indicates the column affinity that should be used for the nth ** memory cell in the range. */ case OP_Affinity: { #if 0 /* local variables moved into u.ao */ char *zAffinity; /* The affinity to be applied */ Mem *pData0; /* First register to which to apply affinity */ Mem *pLast; /* Last register to which to apply affinity */ Mem *pRec; /* Current register */ #endif /* local variables moved into u.ao */ u.ao.zAffinity = pOp->p4.z; u.ao.pData0 = &p->aMem[pOp->p1]; u.ao.pLast = &u.ao.pData0[pOp->p2-1]; for(u.ao.pRec=u.ao.pData0; u.ao.pRec<=u.ao.pLast; u.ao.pRec++){ ExpandBlob(u.ao.pRec); applyAffinity(u.ao.pRec, u.ao.zAffinity[u.ao.pRec-u.ao.pData0], encoding); } break; } /* Opcode: MakeRecord P1 P2 P3 P4 * ** ** Convert P2 registers beginning with P1 into a single entry ................................................................................ ** ** The mapping from character to affinity is given by the SQLITE_AFF_ ** macros defined in sqliteInt.h. ** ** If P4 is NULL then all index fields have the affinity NONE. */ case OP_MakeRecord: { #if 0 /* local variables moved into u.ap */ u8 *zNewRecord; /* A buffer to hold the data for the new record */ Mem *pRec; /* The new record */ u64 nData; /* Number of bytes of data space */ int nHdr; /* Number of bytes of header space */ i64 nByte; /* Data space required for this record */ int nZero; /* Number of zero bytes at the end of the record */ int nVarint; /* Number of bytes in a varint */ ................................................................................ Mem *pData0; /* First field to be combined into the record */ Mem *pLast; /* Last field of the record */ int nField; /* Number of fields in the record */ char *zAffinity; /* The affinity string for the record */ int file_format; /* File format to use for encoding */ int i; /* Space used in zNewRecord[] */ int len; /* Length of a field */ #endif /* local variables moved into u.ap */ /* Assuming the record contains N fields, the record format looks ** like this: ** ** ------------------------------------------------------------------------ ** | hdr-size | type 0 | type 1 | ... | type N-1 | data0 | ... | data N-1 | ** ------------------------------------------------------------------------ ................................................................................ ** and so froth. ** ** Each type field is a varint representing the serial type of the ** corresponding data element (see sqlite3VdbeSerialType()). The ** hdr-size field is also a varint which is the offset from the beginning ** of the record to data0. */ u.ap.nData = 0; /* Number of bytes of data space */ u.ap.nHdr = 0; /* Number of bytes of header space */ u.ap.nByte = 0; /* Data space required for this record */ u.ap.nZero = 0; /* Number of zero bytes at the end of the record */ u.ap.nField = pOp->p1; u.ap.zAffinity = pOp->p4.z; assert( u.ap.nField>0 && pOp->p2>0 && pOp->p2+u.ap.nField<=p->nMem+1 ); u.ap.pData0 = &p->aMem[u.ap.nField]; u.ap.nField = pOp->p2; u.ap.pLast = &u.ap.pData0[u.ap.nField-1]; u.ap.file_format = p->minWriteFileFormat; /* Loop through the elements that will make up the record to figure ** out how much space is required for the new record. */ for(u.ap.pRec=u.ap.pData0; u.ap.pRec<=u.ap.pLast; u.ap.pRec++){ if( u.ap.zAffinity ){ applyAffinity(u.ap.pRec, u.ap.zAffinity[u.ap.pRec-u.ap.pData0], encoding); } if( u.ap.pRec->flags&MEM_Zero && u.ap.pRec->n>0 ){ sqlite3VdbeMemExpandBlob(u.ap.pRec); } u.ap.serial_type = sqlite3VdbeSerialType(u.ap.pRec, u.ap.file_format); u.ap.len = sqlite3VdbeSerialTypeLen(u.ap.serial_type); u.ap.nData += u.ap.len; u.ap.nHdr += sqlite3VarintLen(u.ap.serial_type); if( u.ap.pRec->flags & MEM_Zero ){ /* Only pure zero-filled BLOBs can be input to this Opcode. ** We do not allow blobs with a prefix and a zero-filled tail. */ u.ap.nZero += u.ap.pRec->u.nZero; }else if( u.ap.len ){ u.ap.nZero = 0; } } /* Add the initial header varint and total the size */ u.ap.nHdr += u.ap.nVarint = sqlite3VarintLen(u.ap.nHdr); if( u.ap.nVarint<sqlite3VarintLen(u.ap.nHdr) ){ u.ap.nHdr++; } u.ap.nByte = u.ap.nHdr+u.ap.nData-u.ap.nZero; if( u.ap.nByte>db->aLimit[SQLITE_LIMIT_LENGTH] ){ goto too_big; } /* Make sure the output register has a buffer large enough to store ** the new record. The output register (pOp->p3) is not allowed to ** be one of the input registers (because the following call to ** sqlite3VdbeMemGrow() could clobber the value before it is used). */ assert( pOp->p3<pOp->p1 || pOp->p3>=pOp->p1+pOp->p2 ); pOut = &p->aMem[pOp->p3]; if( sqlite3VdbeMemGrow(pOut, (int)u.ap.nByte, 0) ){ goto no_mem; } u.ap.zNewRecord = (u8 *)pOut->z; /* Write the record */ u.ap.i = putVarint32(u.ap.zNewRecord, u.ap.nHdr); for(u.ap.pRec=u.ap.pData0; u.ap.pRec<=u.ap.pLast; u.ap.pRec++){ u.ap.serial_type = sqlite3VdbeSerialType(u.ap.pRec, u.ap.file_format); u.ap.i += putVarint32(&u.ap.zNewRecord[u.ap.i], u.ap.serial_type); /* serial type */ } for(u.ap.pRec=u.ap.pData0; u.ap.pRec<=u.ap.pLast; u.ap.pRec++){ /* serial data */ u.ap.i += sqlite3VdbeSerialPut(&u.ap.zNewRecord[u.ap.i], (int)(u.ap.nByte-u.ap.i), u.ap.pRec,u.ap.file_format); } assert( u.ap.i==u.ap.nByte ); assert( pOp->p3>0 && pOp->p3<=p->nMem ); pOut->n = (int)u.ap.nByte; pOut->flags = MEM_Blob | MEM_Dyn; pOut->xDel = 0; if( u.ap.nZero ){ pOut->u.nZero = u.ap.nZero; pOut->flags |= MEM_Zero; } pOut->enc = SQLITE_UTF8; /* In case the blob is ever converted to text */ REGISTER_TRACE(pOp->p3, pOut); UPDATE_MAX_BLOBSIZE(pOut); break; } ................................................................................ /* Opcode: Count P1 P2 * * * ** ** Store the number of entries (an integer value) in the table or index ** opened by cursor P1 in register P2 */ #ifndef SQLITE_OMIT_BTREECOUNT case OP_Count: { /* out2-prerelease */ #if 0 /* local variables moved into u.aq */ i64 nEntry; BtCursor *pCrsr; #endif /* local variables moved into u.aq */ u.aq.pCrsr = p->apCsr[pOp->p1]->pCursor; if( u.aq.pCrsr ){ rc = sqlite3BtreeCount(u.aq.pCrsr, &u.aq.nEntry); }else{ u.aq.nEntry = 0; } pOut->flags = MEM_Int; pOut->u.i = u.aq.nEntry; break; } #endif /* Opcode: Statement P1 * * * * ** ** Begin an individual statement transaction which is part of a larger ................................................................................ ** will be allocated and initialized. ** ** The statement is begun on the database file with index P1. The main ** database file has an index of 0 and the file used for temporary tables ** has an index of 1. */ case OP_Statement: { #if 0 /* local variables moved into u.ar */ int i; Btree *pBt; #endif /* local variables moved into u.ar */ if( db->autoCommit==0 || db->activeVdbeCnt>1 ){ u.ar.i = pOp->p1; assert( u.ar.i>=0 && u.ar.i<db->nDb ); assert( db->aDb[u.ar.i].pBt!=0 ); u.ar.pBt = db->aDb[u.ar.i].pBt; assert( sqlite3BtreeIsInTrans(u.ar.pBt) ); assert( (p->btreeMask & (1<<u.ar.i))!=0 ); if( p->iStatement==0 ){ assert( db->nStatement>=0 && db->nSavepoint>=0 ); db->nStatement++; p->iStatement = db->nSavepoint + db->nStatement; } rc = sqlite3BtreeBeginStmt(u.ar.pBt, p->iStatement); } break; } /* Opcode: Savepoint P1 * * P4 * ** ** Open, release or rollback the savepoint named by parameter P4, depending ** on the value of P1. To open a new savepoint, P1==0. To release (commit) an ** existing savepoint, P1==1, or to rollback an existing savepoint P1==2. */ case OP_Savepoint: { #if 0 /* local variables moved into u.as */ int p1; /* Value of P1 operand */ char *zName; /* Name of savepoint */ int nName; Savepoint *pNew; Savepoint *pSavepoint; Savepoint *pTmp; int iSavepoint; int ii; #endif /* local variables moved into u.as */ u.as.p1 = pOp->p1; u.as.zName = pOp->p4.z; /* Assert that the u.as.p1 parameter is valid. Also that if there is no open ** transaction, then there cannot be any savepoints. */ assert( db->pSavepoint==0 || db->autoCommit==0 ); assert( u.as.p1==SAVEPOINT_BEGIN||u.as.p1==SAVEPOINT_RELEASE||u.as.p1==SAVEPOINT_ROLLBACK ); assert( db->pSavepoint || db->isTransactionSavepoint==0 ); assert( checkSavepointCount(db) ); if( u.as.p1==SAVEPOINT_BEGIN ){ if( db->writeVdbeCnt>0 ){ /* A new savepoint cannot be created if there are active write ** statements (i.e. open read/write incremental blob handles). */ sqlite3SetString(&p->zErrMsg, db, "cannot open savepoint - " "SQL statements in progress"); rc = SQLITE_BUSY; }else{ u.as.nName = sqlite3Strlen30(u.as.zName); /* Create a new savepoint structure. */ u.as.pNew = sqlite3DbMallocRaw(db, sizeof(Savepoint)+u.as.nName+1); if( u.as.pNew ){ u.as.pNew->zName = (char *)&u.as.pNew[1]; memcpy(u.as.pNew->zName, u.as.zName, u.as.nName+1); /* If there is no open transaction, then mark this as a special ** "transaction savepoint". */ if( db->autoCommit ){ db->autoCommit = 0; db->isTransactionSavepoint = 1; }else{ db->nSavepoint++; } /* Link the new savepoint into the database handle's list. */ u.as.pNew->pNext = db->pSavepoint; db->pSavepoint = u.as.pNew; } } }else{ u.as.iSavepoint = 0; /* Find the named savepoint. If there is no such savepoint, then an ** an error is returned to the user. */ for( u.as.pSavepoint = db->pSavepoint; u.as.pSavepoint && sqlite3StrICmp(u.as.pSavepoint->zName, u.as.zName); u.as.pSavepoint = u.as.pSavepoint->pNext ){ u.as.iSavepoint++; } if( !u.as.pSavepoint ){ sqlite3SetString(&p->zErrMsg, db, "no such savepoint: %s", u.as.zName); rc = SQLITE_ERROR; }else if( db->writeVdbeCnt>0 || (u.as.p1==SAVEPOINT_ROLLBACK && db->activeVdbeCnt>1) ){ /* It is not possible to release (commit) a savepoint if there are ** active write statements. It is not possible to rollback a savepoint ** if there are any active statements at all. */ sqlite3SetString(&p->zErrMsg, db, "cannot %s savepoint - SQL statements in progress", (u.as.p1==SAVEPOINT_ROLLBACK ? "rollback": "release") ); rc = SQLITE_BUSY; }else{ /* Determine whether or not this is a transaction savepoint. If so, ** and this is a RELEASE command, then the current transaction ** is committed. */ int isTransaction = u.as.pSavepoint->pNext==0 && db->isTransactionSavepoint; if( isTransaction && u.as.p1==SAVEPOINT_RELEASE ){ db->autoCommit = 1; if( sqlite3VdbeHalt(p)==SQLITE_BUSY ){ p->pc = pc; db->autoCommit = 0; p->rc = rc = SQLITE_BUSY; goto vdbe_return; } db->isTransactionSavepoint = 0; rc = p->rc; }else{ u.as.iSavepoint = db->nSavepoint - u.as.iSavepoint - 1; for(u.as.ii=0; u.as.ii<db->nDb; u.as.ii++){ rc = sqlite3BtreeSavepoint(db->aDb[u.as.ii].pBt, u.as.p1, u.as.iSavepoint); if( rc!=SQLITE_OK ){ goto abort_due_to_error; } } if( u.as.p1==SAVEPOINT_ROLLBACK && (db->flags&SQLITE_InternChanges)!=0 ){ sqlite3ExpirePreparedStatements(db); sqlite3ResetInternalSchema(db, 0); } } /* Regardless of whether this is a RELEASE or ROLLBACK, destroy all ** savepoints nested inside of the savepoint being operated on. */ while( db->pSavepoint!=u.as.pSavepoint ){ u.as.pTmp = db->pSavepoint; db->pSavepoint = u.as.pTmp->pNext; sqlite3DbFree(db, u.as.pTmp); db->nSavepoint--; } /* If it is a RELEASE, then destroy the savepoint being operated on too */ if( u.as.p1==SAVEPOINT_RELEASE ){ assert( u.as.pSavepoint==db->pSavepoint ); db->pSavepoint = u.as.pSavepoint->pNext; sqlite3DbFree(db, u.as.pSavepoint); if( !isTransaction ){ db->nSavepoint--; } } } } ................................................................................ ** back any currently active btree transactions. If there are any active ** VMs (apart from this one), then a ROLLBACK fails. A COMMIT fails if ** there are active writing VMs or active VMs that use shared cache. ** ** This instruction causes the VM to halt. */ case OP_AutoCommit: { #if 0 /* local variables moved into u.at */ int desiredAutoCommit; int iRollback; int turnOnAC; #endif /* local variables moved into u.at */ u.at.desiredAutoCommit = pOp->p1; u.at.iRollback = pOp->p2; u.at.turnOnAC = u.at.desiredAutoCommit && !db->autoCommit; assert( u.at.desiredAutoCommit==1 || u.at.desiredAutoCommit==0 ); assert( u.at.desiredAutoCommit==1 || u.at.iRollback==0 ); assert( db->activeVdbeCnt>0 ); /* At least this one VM is active */ if( u.at.turnOnAC && u.at.iRollback && db->activeVdbeCnt>1 ){ /* If this instruction implements a ROLLBACK and other VMs are ** still running, and a transaction is active, return an error indicating ** that the other VMs must complete first. */ sqlite3SetString(&p->zErrMsg, db, "cannot rollback transaction - " "SQL statements in progress"); rc = SQLITE_BUSY; }else if( u.at.turnOnAC && !u.at.iRollback && db->writeVdbeCnt>1 ){ /* If this instruction implements a COMMIT and other VMs are writing ** return an error indicating that the other VMs must complete first. */ sqlite3SetString(&p->zErrMsg, db, "cannot commit transaction - " "SQL statements in progress"); rc = SQLITE_BUSY; }else if( u.at.desiredAutoCommit!=db->autoCommit ){ if( u.at.iRollback ){ assert( u.at.desiredAutoCommit==1 ); sqlite3RollbackAll(db); db->autoCommit = 1; }else{ db->autoCommit = (u8)u.at.desiredAutoCommit; if( sqlite3VdbeHalt(p)==SQLITE_BUSY ){ p->pc = pc; db->autoCommit = (u8)(1-u.at.desiredAutoCommit); p->rc = rc = SQLITE_BUSY; goto vdbe_return; } } assert( db->nStatement==0 ); sqlite3CloseSavepoints(db); if( p->rc==SQLITE_OK ){ ................................................................................ rc = SQLITE_DONE; }else{ rc = SQLITE_ERROR; } goto vdbe_return; }else{ sqlite3SetString(&p->zErrMsg, db, (!u.at.desiredAutoCommit)?"cannot start a transaction within a transaction":( (u.at.iRollback)?"cannot rollback - no transaction is active": "cannot commit - no transaction is active")); rc = SQLITE_ERROR; } break; } ................................................................................ ** write transaction must be started before any changes can be made to the ** database. If P2 is 2 or greater then an EXCLUSIVE lock is also obtained ** on the file. ** ** If P2 is zero, then a read-lock is obtained on the database file. */ case OP_Transaction: { #if 0 /* local variables moved into u.au */ int i; Btree *pBt; #endif /* local variables moved into u.au */ u.au.i = pOp->p1; assert( u.au.i>=0 && u.au.i<db->nDb ); assert( (p->btreeMask & (1<<u.au.i))!=0 ); u.au.pBt = db->aDb[u.au.i].pBt; if( u.au.pBt ){ rc = sqlite3BtreeBeginTrans(u.au.pBt, pOp->p2); if( rc==SQLITE_BUSY ){ p->pc = pc; p->rc = rc = SQLITE_BUSY; goto vdbe_return; } if( rc!=SQLITE_OK && rc!=SQLITE_READONLY /* && rc!=SQLITE_BUSY */ ){ goto abort_due_to_error; ................................................................................ ** temporary tables. ** ** There must be a read-lock on the database (either a transaction ** must be started or there must be an open cursor) before ** executing this instruction. */ case OP_ReadCookie: { /* out2-prerelease */ #if 0 /* local variables moved into u.av */ int iMeta; int iDb; int iCookie; #endif /* local variables moved into u.av */ u.av.iDb = pOp->p1; u.av.iCookie = pOp->p3; assert( pOp->p3<SQLITE_N_BTREE_META ); assert( u.av.iDb>=0 && u.av.iDb<db->nDb ); assert( db->aDb[u.av.iDb].pBt!=0 ); assert( (p->btreeMask & (1<<u.av.iDb))!=0 ); rc = sqlite3BtreeGetMeta(db->aDb[u.av.iDb].pBt, u.av.iCookie, (u32 *)&u.av.iMeta); pOut->u.i = u.av.iMeta; MemSetTypeFlag(pOut, MEM_Int); break; } /* Opcode: SetCookie P1 P2 P3 * * ** ** Write the content of register P3 (interpreted as an integer) ................................................................................ ** P2==2 is the database format. P2==3 is the recommended pager cache ** size, and so forth. P1==0 is the main database file and P1==1 is the ** database file used to store temporary tables. ** ** A transaction must be started before executing this opcode. */ case OP_SetCookie: { /* in3 */ #if 0 /* local variables moved into u.aw */ Db *pDb; #endif /* local variables moved into u.aw */ assert( pOp->p2<SQLITE_N_BTREE_META ); assert( pOp->p1>=0 && pOp->p1<db->nDb ); assert( (p->btreeMask & (1<<pOp->p1))!=0 ); u.aw.pDb = &db->aDb[pOp->p1]; assert( u.aw.pDb->pBt!=0 ); sqlite3VdbeMemIntegerify(pIn3); /* See note about index shifting on OP_ReadCookie */ rc = sqlite3BtreeUpdateMeta(u.aw.pDb->pBt, pOp->p2, (int)pIn3->u.i); if( pOp->p2==BTREE_SCHEMA_VERSION ){ /* When the schema cookie changes, record the new cookie internally */ u.aw.pDb->pSchema->schema_cookie = (int)pIn3->u.i; db->flags |= SQLITE_InternChanges; }else if( pOp->p2==BTREE_FILE_FORMAT ){ /* Record changes in the file format */ u.aw.pDb->pSchema->file_format = (u8)pIn3->u.i; } if( pOp->p1==1 ){ /* Invalidate all prepared statements whenever the TEMP database ** schema is changed. Ticket #1644 */ sqlite3ExpirePreparedStatements(db); } break; ................................................................................ ** and that the current process needs to reread the schema. ** ** Either a transaction needs to have been started or an OP_Open needs ** to be executed (to establish a read lock) before this opcode is ** invoked. */ case OP_VerifyCookie: { #if 0 /* local variables moved into u.ax */ int iMeta; Btree *pBt; #endif /* local variables moved into u.ax */ assert( pOp->p1>=0 && pOp->p1<db->nDb ); assert( (p->btreeMask & (1<<pOp->p1))!=0 ); u.ax.pBt = db->aDb[pOp->p1].pBt; if( u.ax.pBt ){ rc = sqlite3BtreeGetMeta(u.ax.pBt, BTREE_SCHEMA_VERSION, (u32 *)&u.ax.iMeta); }else{ rc = SQLITE_OK; u.ax.iMeta = 0; } if( rc==SQLITE_OK && u.ax.iMeta!=pOp->p2 ){ sqlite3DbFree(db, p->zErrMsg); p->zErrMsg = sqlite3DbStrDup(db, "database schema has changed"); /* If the schema-cookie from the database file matches the cookie ** stored with the in-memory representation of the schema, do ** not reload the schema from the database file. ** ** If virtual-tables are in use, this is not just an optimization. ................................................................................ ** are queried from within xNext() and other v-table methods using ** prepared queries. If such a query is out-of-date, we do not want to ** discard the database schema, as the user code implementing the ** v-table would have to be ready for the sqlite3_vtab structure itself ** to be invalidated whenever sqlite3_step() is called from within ** a v-table method. */ if( db->aDb[pOp->p1].pSchema->schema_cookie!=u.ax.iMeta ){ sqlite3ResetInternalSchema(db, pOp->p1); } sqlite3ExpirePreparedStatements(db); rc = SQLITE_SCHEMA; } break; ................................................................................ ** in read/write mode. For a given table, there can be one or more read-only ** cursors or a single read/write cursor but not both. ** ** See also OpenRead. */ case OP_OpenRead: case OP_OpenWrite: { #if 0 /* local variables moved into u.ay */ int nField; KeyInfo *pKeyInfo; int i; int p2; int iDb; int wrFlag; Btree *pX; VdbeCursor *pCur; Db *pDb; int flags; #endif /* local variables moved into u.ay */ u.ay.nField = 0; u.ay.pKeyInfo = 0; u.ay.i = pOp->p1; u.ay.p2 = pOp->p2; u.ay.iDb = pOp->p3; assert( u.ay.iDb>=0 && u.ay.iDb<db->nDb ); assert( (p->btreeMask & (1<<u.ay.iDb))!=0 ); u.ay.pDb = &db->aDb[u.ay.iDb]; u.ay.pX = u.ay.pDb->pBt; assert( u.ay.pX!=0 ); if( pOp->opcode==OP_OpenWrite ){ u.ay.wrFlag = 1; if( u.ay.pDb->pSchema->file_format < p->minWriteFileFormat ){ p->minWriteFileFormat = u.ay.pDb->pSchema->file_format; } }else{ u.ay.wrFlag = 0; } if( pOp->p5 ){ assert( u.ay.p2>0 ); assert( u.ay.p2<=p->nMem ); pIn2 = &p->aMem[u.ay.p2]; sqlite3VdbeMemIntegerify(pIn2); u.ay.p2 = (int)pIn2->u.i; if( u.ay.p2<2 ) { rc = SQLITE_CORRUPT_BKPT; goto abort_due_to_error; } } assert( u.ay.i>=0 ); if( pOp->p4type==P4_KEYINFO ){ u.ay.pKeyInfo = pOp->p4.pKeyInfo; u.ay.pKeyInfo->enc = ENC(p->db); u.ay.nField = u.ay.pKeyInfo->nField+1; }else if( pOp->p4type==P4_INT32 ){ u.ay.nField = pOp->p4.i; } u.ay.pCur = allocateCursor(p, u.ay.i, u.ay.nField, u.ay.iDb, 1); if( u.ay.pCur==0 ) goto no_mem; u.ay.pCur->nullRow = 1; rc = sqlite3BtreeCursor(u.ay.pX, u.ay.p2, u.ay.wrFlag, u.ay.pKeyInfo, u.ay.pCur->pCursor); u.ay.pCur->pKeyInfo = u.ay.pKeyInfo; switch( rc ){ case SQLITE_BUSY: { p->pc = pc; p->rc = rc = SQLITE_BUSY; goto vdbe_return; } case SQLITE_OK: { u.ay.flags = sqlite3BtreeFlags(u.ay.pCur->pCursor); /* Sanity checking. Only the lower four bits of the u.ay.flags byte should ** be used. Bit 3 (mask 0x08) is unpredictable. The lower 3 bits ** (mask 0x07) should be either 5 (intkey+leafdata for tables) or ** 2 (zerodata for indices). If these conditions are not met it can ** only mean that we are dealing with a corrupt database file */ if( (u.ay.flags & 0xf0)!=0 || ((u.ay.flags & 0x07)!=5 && (u.ay.flags & 0x07)!=2) ){ rc = SQLITE_CORRUPT_BKPT; goto abort_due_to_error; } u.ay.pCur->isTable = (u.ay.flags & BTREE_INTKEY)!=0 ?1:0; u.ay.pCur->isIndex = (u.ay.flags & BTREE_ZERODATA)!=0 ?1:0; /* If P4==0 it means we are expected to open a table. If P4!=0 then ** we expect to be opening an index. If this is not what happened, ** then the database is corrupt */ if( (u.ay.pCur->isTable && pOp->p4type==P4_KEYINFO) || (u.ay.pCur->isIndex && pOp->p4type!=P4_KEYINFO) ){ rc = SQLITE_CORRUPT_BKPT; goto abort_due_to_error; } break; } case SQLITE_EMPTY: { u.ay.pCur->isTable = pOp->p4type!=P4_KEYINFO; u.ay.pCur->isIndex = !u.ay.pCur->isTable; u.ay.pCur->pCursor = 0; rc = SQLITE_OK; break; } default: { goto abort_due_to_error; } } break; } /* Opcode: OpenEphemeral P1 P2 * P4 * ................................................................................ ** This opcode was once called OpenTemp. But that created ** confusion because the term "temp table", might refer either ** to a TEMP table at the SQL level, or to a table opened by ** this opcode. Then this opcode was call OpenVirtual. But ** that created confusion with the whole virtual-table idea. */ case OP_OpenEphemeral: { #if 0 /* local variables moved into u.az */ int i; VdbeCursor *pCx; #endif /* local variables moved into u.az */ static const int openFlags = SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_EXCLUSIVE | SQLITE_OPEN_DELETEONCLOSE | SQLITE_OPEN_TRANSIENT_DB; u.az.i = pOp->p1; assert( u.az.i>=0 ); u.az.pCx = allocateCursor(p, u.az.i, pOp->p2, -1, 1); if( u.az.pCx==0 ) goto no_mem; u.az.pCx->nullRow = 1; rc = sqlite3BtreeFactory(db, 0, 1, SQLITE_DEFAULT_TEMP_CACHE_SIZE, openFlags, &u.az.pCx->pBt); if( rc==SQLITE_OK ){ rc = sqlite3BtreeBeginTrans(u.az.pCx->pBt, 1); } if( rc==SQLITE_OK ){ /* If a transient index is required, create it by calling ** sqlite3BtreeCreateTable() with the BTREE_ZERODATA flag before ** opening it. If a transient table is required, just use the ** automatically created table with root-page 1 (an INTKEY table). */ if( pOp->p4.pKeyInfo ){ int pgno; assert( pOp->p4type==P4_KEYINFO ); rc = sqlite3BtreeCreateTable(u.az.pCx->pBt, &pgno, BTREE_ZERODATA); if( rc==SQLITE_OK ){ assert( pgno==MASTER_ROOT+1 ); rc = sqlite3BtreeCursor(u.az.pCx->pBt, pgno, 1, (KeyInfo*)pOp->p4.z, u.az.pCx->pCursor); u.az.pCx->pKeyInfo = pOp->p4.pKeyInfo; u.az.pCx->pKeyInfo->enc = ENC(p->db); } u.az.pCx->isTable = 0; }else{ rc = sqlite3BtreeCursor(u.az.pCx->pBt, MASTER_ROOT, 1, 0, u.az.pCx->pCursor); u.az.pCx->isTable = 1; } } u.az.pCx->isIndex = !u.az.pCx->isTable; break; } /* Opcode: OpenPseudo P1 P2 P3 * * ** ** Open a new cursor that points to a fake table that contains a single ** row of data. Any attempt to write a second row of data causes the ................................................................................ ** memory cell containing the row data is not overwritten until the ** pseudo table is closed (or a new row is inserted into it). ** ** P3 is the number of fields in the records that will be stored by ** the pseudo-table. */ case OP_OpenPseudo: { #if 0 /* local variables moved into u.ba */ int i; VdbeCursor *pCx; #endif /* local variables moved into u.ba */ u.ba.i = pOp->p1; assert( u.ba.i>=0 ); u.ba.pCx = allocateCursor(p, u.ba.i, pOp->p3, -1, 0); if( u.ba.pCx==0 ) goto no_mem; u.ba.pCx->nullRow = 1; u.ba.pCx->pseudoTable = 1; u.ba.pCx->ephemPseudoTable = (u8)pOp->p2; u.ba.pCx->isTable = 1; u.ba.pCx->isIndex = 0; break; } /* Opcode: Close P1 * * * * ** ** Close a cursor previously opened as P1. If P1 is not ** currently open, this instruction is a no-op. */ case OP_Close: { #if 0 /* local variables moved into u.bb */ int i; #endif /* local variables moved into u.bb */ u.bb.i = pOp->p1; assert( u.bb.i>=0 && u.bb.i<p->nCursor ); sqlite3VdbeFreeCursor(p, p->apCsr[u.bb.i]); p->apCsr[u.bb.i] = 0; break; } /* Opcode: SeekGe P1 P2 P3 P4 * ** ** If cursor P1 refers to an SQL table (B-Tree that uses integer keys), ** use the value in register P3 as the key. If cursor P1 refers ................................................................................ ** ** See also: Found, NotFound, Distinct, SeekGt, SeekGe, SeekLt */ case OP_SeekLt: /* jump, in3 */ case OP_SeekLe: /* jump, in3 */ case OP_SeekGe: /* jump, in3 */ case OP_SeekGt: { /* jump, in3 */ #if 0 /* local variables moved into u.bc */ int i; int res; int oc; VdbeCursor *pC; UnpackedRecord r; int nField; i64 iKey; /* The rowid we are to seek to */ #endif /* local variables moved into u.bc */ u.bc.i = pOp->p1; assert( u.bc.i>=0 && u.bc.i<p->nCursor ); assert( pOp->p2!=0 ); u.bc.pC = p->apCsr[u.bc.i]; assert( u.bc.pC!=0 ); if( u.bc.pC->pCursor!=0 ){ u.bc.oc = pOp->opcode; u.bc.pC->nullRow = 0; if( u.bc.pC->isTable ){ /* The input value in P3 might be of any type: integer, real, string, ** blob, or NULL. But it needs to be an integer before we can do ** the seek, so covert it. */ applyNumericAffinity(pIn3); u.bc.iKey = sqlite3VdbeIntValue(pIn3); u.bc.pC->rowidIsValid = 0; /* If the P3 value could not be converted into an integer without ** loss of information, then special processing is required... */ if( (pIn3->flags & MEM_Int)==0 ){ if( (pIn3->flags & MEM_Real)==0 ){ /* If the P3 value cannot be converted into any kind of a number, ** then the seek is not possible, so jump to P2 */ ................................................................................ pc = pOp->p2 - 1; break; } /* If we reach this point, then the P3 value must be a floating ** point number. */ assert( (pIn3->flags & MEM_Real)!=0 ); if( u.bc.iKey==SMALLEST_INT64 && (pIn3->r<(double)u.bc.iKey || pIn3->r>0) ){ /* The P3 value is to large in magnitude to be expressed as an ** integer. */ u.bc.res = 1; if( pIn3->r<0 ){ if( u.bc.oc==OP_SeekGt || u.bc.oc==OP_SeekGe ){ rc = sqlite3BtreeFirst(u.bc.pC->pCursor, &u.bc.res); if( rc!=SQLITE_OK ) goto abort_due_to_error; } }else{ if( u.bc.oc==OP_SeekLt || u.bc.oc==OP_SeekLe ){ rc = sqlite3BtreeLast(u.bc.pC->pCursor, &u.bc.res); if( rc!=SQLITE_OK ) goto abort_due_to_error; } } if( u.bc.res ){ pc = pOp->p2 - 1; } break; }else if( u.bc.oc==OP_SeekLt || u.bc.oc==OP_SeekGe ){ /* Use the ceiling() function to convert real->int */ if( pIn3->r > (double)u.bc.iKey ) u.bc.iKey++; }else{ /* Use the floor() function to convert real->int */ assert( u.bc.oc==OP_SeekLe || u.bc.oc==OP_SeekGt ); if( pIn3->r < (double)u.bc.iKey ) u.bc.iKey--; } } rc = sqlite3BtreeMovetoUnpacked(u.bc.pC->pCursor, 0, (u64)u.bc.iKey, 0, &u.bc.res); if( rc!=SQLITE_OK ){ goto abort_due_to_error; } if( u.bc.res==0 ){ u.bc.pC->rowidIsValid = 1; u.bc.pC->lastRowid = u.bc.iKey; } }else{ u.bc.nField = pOp->p4.i; assert( pOp->p4type==P4_INT32 ); assert( u.bc.nField>0 ); u.bc.r.pKeyInfo = u.bc.pC->pKeyInfo; u.bc.r.nField = (u16)u.bc.nField; if( u.bc.oc==OP_SeekGt || u.bc.oc==OP_SeekLe ){ u.bc.r.flags = UNPACKED_INCRKEY; }else{ u.bc.r.flags = 0; } u.bc.r.aMem = &p->aMem[pOp->p3]; rc = sqlite3BtreeMovetoUnpacked(u.bc.pC->pCursor, &u.bc.r, 0, 0, &u.bc.res); if( rc!=SQLITE_OK ){ goto abort_due_to_error; } u.bc.pC->rowidIsValid = 0; } u.bc.pC->deferredMoveto = 0; u.bc.pC->cacheStatus = CACHE_STALE; #ifdef SQLITE_TEST sqlite3_search_count++; #endif if( u.bc.oc==OP_SeekGe || u.bc.oc==OP_SeekGt ){ if( u.bc.res<0 || (u.bc.res==0 && u.bc.oc==OP_SeekGt) ){ rc = sqlite3BtreeNext(u.bc.pC->pCursor, &u.bc.res); if( rc!=SQLITE_OK ) goto abort_due_to_error; u.bc.pC->rowidIsValid = 0; }else{ u.bc.res = 0; } }else{ assert( u.bc.oc==OP_SeekLt || u.bc.oc==OP_SeekLe ); if( u.bc.res>0 || (u.bc.res==0 && u.bc.oc==OP_SeekLt) ){ rc = sqlite3BtreePrevious(u.bc.pC->pCursor, &u.bc.res); if( rc!=SQLITE_OK ) goto abort_due_to_error; u.bc.pC->rowidIsValid = 0; }else{ /* u.bc.res might be negative because the table is empty. Check to ** see if this is the case. */ u.bc.res = sqlite3BtreeEof(u.bc.pC->pCursor); } } assert( pOp->p2>0 ); if( u.bc.res ){ pc = pOp->p2 - 1; } }else if( !u.bc.pC->pseudoTable ){ /* This happens when attempting to open the sqlite3_master table ** for read access returns SQLITE_EMPTY. In this case always ** take the jump (since there are no records in the table). */ pc = pOp->p2 - 1; } break; } /* Opcode: Seek P1 P2 * * * ** ................................................................................ ** for P1 to move so that it points to the rowid given by P2. ** ** This is actually a deferred seek. Nothing actually happens until ** the cursor is used to read a record. That way, if no reads ** occur, no unnecessary I/O happens. */ case OP_Seek: { /* in2 */ #if 0 /* local variables moved into u.bd */ int i; VdbeCursor *pC; #endif /* local variables moved into u.bd */ u.bd.i = pOp->p1; assert( u.bd.i>=0 && u.bd.i<p->nCursor ); u.bd.pC = p->apCsr[u.bd.i]; assert( u.bd.pC!=0 ); if( u.bd.pC->pCursor!=0 ){ assert( u.bd.pC->isTable ); u.bd.pC->nullRow = 0; u.bd.pC->movetoTarget = sqlite3VdbeIntValue(pIn2); u.bd.pC->rowidIsValid = 0; u.bd.pC->deferredMoveto = 1; } break; } /* Opcode: Found P1 P2 P3 * * ** ................................................................................ ** to P2. If an entry does existing, fall through. The cursor is left ** pointing to the entry that matches. ** ** See also: Found, NotExists, IsUnique */ case OP_NotFound: /* jump, in3 */ case OP_Found: { /* jump, in3 */ #if 0 /* local variables moved into u.be */ int i; int alreadyExists; VdbeCursor *pC; int res; UnpackedRecord *pIdxKey; char aTempRec[ROUND8(sizeof(UnpackedRecord)) + sizeof(Mem)*3 + 7]; #endif /* local variables moved into u.be */ u.be.i = pOp->p1; u.be.alreadyExists = 0; assert( u.be.i>=0 && u.be.i<p->nCursor ); assert( p->apCsr[u.be.i]!=0 ); if( (u.be.pC = p->apCsr[u.be.i])->pCursor!=0 ){ assert( u.be.pC->isTable==0 ); assert( pIn3->flags & MEM_Blob ); u.be.pIdxKey = sqlite3VdbeRecordUnpack(u.be.pC->pKeyInfo, pIn3->n, pIn3->z, u.be.aTempRec, sizeof(u.be.aTempRec)); if( u.be.pIdxKey==0 ){ goto no_mem; } if( pOp->opcode==OP_Found ){ u.be.pIdxKey->flags |= UNPACKED_PREFIX_MATCH; } rc = sqlite3BtreeMovetoUnpacked(u.be.pC->pCursor, u.be.pIdxKey, 0, 0, &u.be.res); sqlite3VdbeDeleteUnpackedRecord(u.be.pIdxKey); if( rc!=SQLITE_OK ){ break; } u.be.alreadyExists = (u.be.res==0); u.be.pC->deferredMoveto = 0; u.be.pC->cacheStatus = CACHE_STALE; } if( pOp->opcode==OP_Found ){ if( u.be.alreadyExists ) pc = pOp->p2 - 1; }else{ if( !u.be.alreadyExists ) pc = pOp->p2 - 1; } break; } /* Opcode: IsUnique P1 P2 P3 P4 * ** ** Cursor P1 is open on an index. So it has no data and its key consists ................................................................................ ** to instruction P2. Otherwise, the rowid of the conflicting index ** entry is copied to register P3 and control falls through to the next ** instruction. ** ** See also: NotFound, NotExists, Found */ case OP_IsUnique: { /* jump, in3 */ #if 0 /* local variables moved into u.bf */ u16 ii; VdbeCursor *pCx; BtCursor *pCrsr; u16 nField; Mem *aMem; UnpackedRecord r; /* B-Tree index search key */ i64 R; /* Rowid stored in register P3 */ #endif /* local variables moved into u.bf */ u.bf.aMem = &p->aMem[pOp->p4.i]; /* Assert that the values of parameters P1 and P4 are in range. */ assert( pOp->p4type==P4_INT32 ); assert( pOp->p4.i>0 && pOp->p4.i<=p->nMem ); assert( pOp->p1>=0 && pOp->p1<p->nCursor ); /* Find the index cursor. */ u.bf.pCx = p->apCsr[pOp->p1]; assert( u.bf.pCx->deferredMoveto==0 ); u.bf.pCx->seekResult = 0; u.bf.pCx->cacheStatus = CACHE_STALE; u.bf.pCrsr = u.bf.pCx->pCursor; /* If any of the values are NULL, take the jump. */ u.bf.nField = u.bf.pCx->pKeyInfo->nField; for(u.bf.ii=0; u.bf.ii<u.bf.nField; u.bf.ii++){ if( u.bf.aMem[u.bf.ii].flags & MEM_Null ){ pc = pOp->p2 - 1; u.bf.pCrsr = 0; break; } } assert( (u.bf.aMem[u.bf.nField].flags & MEM_Null)==0 ); if( u.bf.pCrsr!=0 ){ /* Populate the index search key. */ u.bf.r.pKeyInfo = u.bf.pCx->pKeyInfo; u.bf.r.nField = u.bf.nField + 1; u.bf.r.flags = UNPACKED_PREFIX_SEARCH; u.bf.r.aMem = u.bf.aMem; /* Extract the value of u.bf.R from register P3. */ sqlite3VdbeMemIntegerify(pIn3); u.bf.R = pIn3->u.i; /* Search the B-Tree index. If no conflicting record is found, jump ** to P2. Otherwise, copy the rowid of the conflicting record to ** register P3 and fall through to the next instruction. */ rc = sqlite3BtreeMovetoUnpacked(u.bf.pCrsr, &u.bf.r, 0, 0, &u.bf.pCx->seekResult); if( (u.bf.r.flags & UNPACKED_PREFIX_SEARCH) || u.bf.r.rowid==u.bf.R ){ pc = pOp->p2 - 1; }else{ pIn3->u.i = u.bf.r.rowid; } } break; } /* Opcode: NotExists P1 P2 P3 * * ** ................................................................................ ** operation assumes the key is an integer and that P1 is a table whereas ** NotFound assumes key is a blob constructed from MakeRecord and ** P1 is an index. ** ** See also: Found, NotFound, IsUnique */ case OP_NotExists: { /* jump, in3 */ #if 0 /* local variables moved into u.bg */ int i; VdbeCursor *pC; BtCursor *pCrsr; int res; u64 iKey; #endif /* local variables moved into u.bg */ u.bg.i = pOp->p1; assert( u.bg.i>=0 && u.bg.i<p->nCursor ); assert( p->apCsr[u.bg.i]!=0 ); if( (u.bg.pCrsr = (u.bg.pC = p->apCsr[u.bg.i])->pCursor)!=0 ){ u.bg.res = 0; assert( pIn3->flags & MEM_Int ); assert( p->apCsr[u.bg.i]->isTable ); u.bg.iKey = intToKey(pIn3->u.i); rc = sqlite3BtreeMovetoUnpacked(u.bg.pCrsr, 0, u.bg.iKey, 0, &u.bg.res); u.bg.pC->lastRowid = pIn3->u.i; u.bg.pC->rowidIsValid = u.bg.res==0 ?1:0; u.bg.pC->nullRow = 0; u.bg.pC->cacheStatus = CACHE_STALE; u.bg.pC->deferredMoveto = 0; if( u.bg.res!=0 ){ pc = pOp->p2 - 1; assert( u.bg.pC->rowidIsValid==0 ); } u.bg.pC->seekResult = u.bg.res; }else if( !u.bg.pC->pseudoTable ){ /* This happens when an attempt to open a read cursor on the ** sqlite_master table returns SQLITE_EMPTY. */ assert( u.bg.pC->isTable ); pc = pOp->p2 - 1; assert( u.bg.pC->rowidIsValid==0 ); u.bg.pC->seekResult = 0; } break; } /* Opcode: Sequence P1 P2 * * * ** ** Find the next available sequence number for cursor P1. ** Write the sequence number into register P2. ** The sequence number on the cursor is incremented after this ** instruction. */ case OP_Sequence: { /* out2-prerelease */ int i = pOp->p1; assert( i>=0 && i<p->nCursor ); assert( p->apCsr[i]!=0 ); pOut->u.i = p->apCsr[i]->seqCount++; MemSetTypeFlag(pOut, MEM_Int); break; } /* Opcode: NewRowid P1 P2 P3 * * ** ................................................................................ ** generated record number. No new record numbers are allowed to be less ** than this value. When this value reaches its maximum, a SQLITE_FULL ** error is generated. The P3 register is updated with the generated ** record number. This P3 mechanism is used to help implement the ** AUTOINCREMENT feature. */ case OP_NewRowid: { /* out2-prerelease */ #if 0 /* local variables moved into u.bh */ int i; i64 v; VdbeCursor *pC; int res; int rx; int cnt; i64 x; Mem *pMem; #endif /* local variables moved into u.bh */ u.bh.i = pOp->p1; u.bh.v = 0; u.bh.res = 0; u.bh.rx = SQLITE_OK; assert( u.bh.i>=0 && u.bh.i<p->nCursor ); assert( p->apCsr[u.bh.i]!=0 ); if( (u.bh.pC = p->apCsr[u.bh.i])->pCursor==0 ){ /* The zero initialization above is all that is needed */ }else{ /* The next rowid or record number (different terms for the same ** thing) is obtained in a two-step algorithm. ** ** First we attempt to find the largest existing rowid and add one ** to that. But if the largest existing rowid is already the maximum ** positive integer, we have to fall through to the second ** probabilistic algorithm ** ** The second algorithm is to select a rowid at random and see if ** it already exists in the table. If it does not exist, we have ** succeeded. If the random rowid does exist, we select a new one ** and try again, up to 1000 times. ** ** For a table with less than 2 billion entries, the probability ** of not finding a unused rowid is about 1.0e-300. This is a ** non-zero probability, but it is still vanishingly small and should ** never cause a problem. You are much, much more likely to have a ** hardware failure than for this algorithm to fail. ** ** The analysis in the previous paragraph assumes that you have a good ** source of random numbers. Is a library function like lrand48() ** good enough? Maybe. Maybe not. It's hard to know whether there ** might be subtle bugs is some implementations of lrand48() that ** could cause problems. To avoid uncertainty, SQLite uses its own ** random number generator based on the RC4 algorithm. ** ** To promote locality of reference for repetitive inserts, the ** first few attempts at choosing a random rowid pick values just a little ** larger than the previous rowid. This has been shown experimentally ** to double the speed of the COPY operation. */ u.bh.cnt = 0; if( (sqlite3BtreeFlags(u.bh.pC->pCursor)&(BTREE_INTKEY|BTREE_ZERODATA)) != BTREE_INTKEY ){ rc = SQLITE_CORRUPT_BKPT; goto abort_due_to_error; } assert( (sqlite3BtreeFlags(u.bh.pC->pCursor) & BTREE_INTKEY)!=0 ); assert( (sqlite3BtreeFlags(u.bh.pC->pCursor) & BTREE_ZERODATA)==0 ); #ifdef SQLITE_32BIT_ROWID # define MAX_ROWID 0x7fffffff #else /* Some compilers complain about constants of the form 0x7fffffffffffffff. ** Others complain about 0x7ffffffffffffffffLL. The following macro seems ** to provide the constant while making all compilers happy. */ # define MAX_ROWID (i64)( (((u64)0x7fffffff)<<32) | (u64)0xffffffff ) #endif if( !u.bh.pC->useRandomRowid ){ u.bh.v = sqlite3BtreeGetCachedRowid(u.bh.pC->pCursor); if( u.bh.v==0 ){ rc = sqlite3BtreeLast(u.bh.pC->pCursor, &u.bh.res); if( rc!=SQLITE_OK ){ goto abort_due_to_error; } if( u.bh.res ){ u.bh.v = 1; }else{ sqlite3BtreeKeySize(u.bh.pC->pCursor, &u.bh.v); u.bh.v = keyToInt(u.bh.v); if( u.bh.v==MAX_ROWID ){ u.bh.pC->useRandomRowid = 1; }else{ u.bh.v++; } } } #ifndef SQLITE_OMIT_AUTOINCREMENT if( pOp->p3 ){ assert( pOp->p3>0 && pOp->p3<=p->nMem ); /* P3 is a valid memory cell */ u.bh.pMem = &p->aMem[pOp->p3]; REGISTER_TRACE(pOp->p3, u.bh.pMem); sqlite3VdbeMemIntegerify(u.bh.pMem); assert( (u.bh.pMem->flags & MEM_Int)!=0 ); /* mem(P3) holds an integer */ if( u.bh.pMem->u.i==MAX_ROWID || u.bh.pC->useRandomRowid ){ rc = SQLITE_FULL; goto abort_due_to_error; } if( u.bh.v<u.bh.pMem->u.i+1 ){ u.bh.v = u.bh.pMem->u.i + 1; } u.bh.pMem->u.i = u.bh.v; } #endif sqlite3BtreeSetCachedRowid(u.bh.pC->pCursor, u.bh.v<MAX_ROWID ? u.bh.v+1 : 0); } if( u.bh.pC->useRandomRowid ){ assert( pOp->p3==0 ); /* SQLITE_FULL must have occurred prior to this */ u.bh.v = db->priorNewRowid; u.bh.cnt = 0; do{ if( u.bh.cnt==0 && (u.bh.v&0xffffff)==u.bh.v ){ u.bh.v++; }else{ sqlite3_randomness(sizeof(u.bh.v), &u.bh.v); if( u.bh.cnt<5 ) u.bh.v &= 0xffffff; } if( u.bh.v==0 ) continue; u.bh.x = intToKey(u.bh.v); u.bh.rx = sqlite3BtreeMovetoUnpacked(u.bh.pC->pCursor, 0, (u64)u.bh.x, 0, &u.bh.res); u.bh.cnt++; }while( u.bh.cnt<100 && u.bh.rx==SQLITE_OK && u.bh.res==0 ); db->priorNewRowid = u.bh.v; if( u.bh.rx==SQLITE_OK && u.bh.res==0 ){ rc = SQLITE_FULL; goto abort_due_to_error; } } u.bh.pC->rowidIsValid = 0; u.bh.pC->deferredMoveto = 0; u.bh.pC->cacheStatus = CACHE_STALE; } MemSetTypeFlag(pOut, MEM_Int); pOut->u.i = u.bh.v; break; } /* Opcode: Insert P1 P2 P3 P4 P5 ** ** Write an entry into the table of cursor P1. A new entry is ** created if it doesn't already exist or the data for an existing ................................................................................ ** value of register P2 will then change. Make sure this does not ** cause any problems.) ** ** This instruction only works on tables. The equivalent instruction ** for indices is OP_IdxInsert. */ case OP_Insert: { #if 0 /* local variables moved into u.bi */ Mem *pData; Mem *pKey; i64 iKey; /* The integer ROWID or key for the record to be inserted */ int i; VdbeCursor *pC; int nZero; int seekResult; const char *zDb; const char *zTbl; int op; #endif /* local variables moved into u.bi */ u.bi.pData = &p->aMem[pOp->p2]; u.bi.pKey = &p->aMem[pOp->p3]; u.bi.i = pOp->p1; assert( u.bi.i>=0 && u.bi.i<p->nCursor ); u.bi.pC = p->apCsr[u.bi.i]; assert( u.bi.pC!=0 ); assert( u.bi.pC->pCursor!=0 || u.bi.pC->pseudoTable ); assert( u.bi.pKey->flags & MEM_Int ); assert( u.bi.pC->isTable ); REGISTER_TRACE(pOp->p2, u.bi.pData); REGISTER_TRACE(pOp->p3, u.bi.pKey); u.bi.iKey = intToKey(u.bi.pKey->u.i); if( pOp->p5 & OPFLAG_NCHANGE ) p->nChange++; if( pOp->p5 & OPFLAG_LASTROWID ) db->lastRowid = u.bi.pKey->u.i; if( u.bi.pData->flags & MEM_Null ){ u.bi.pData->z = 0; u.bi.pData->n = 0; }else{ assert( u.bi.pData->flags & (MEM_Blob|MEM_Str) ); } if( u.bi.pC->pseudoTable ){ if( !u.bi.pC->ephemPseudoTable ){ sqlite3DbFree(db, u.bi.pC->pData); } u.bi.pC->iKey = u.bi.iKey; u.bi.pC->nData = u.bi.pData->n; if( u.bi.pData->z==u.bi.pData->zMalloc || u.bi.pC->ephemPseudoTable ){ u.bi.pC->pData = u.bi.pData->z; if( !u.bi.pC->ephemPseudoTable ){ u.bi.pData->flags &= ~MEM_Dyn; u.bi.pData->flags |= MEM_Ephem; u.bi.pData->zMalloc = 0; } }else{ u.bi.pC->pData = sqlite3Malloc( u.bi.pC->nData+2 ); if( !u.bi.pC->pData ) goto no_mem; memcpy(u.bi.pC->pData, u.bi.pData->z, u.bi.pC->nData); u.bi.pC->pData[u.bi.pC->nData] = 0; u.bi.pC->pData[u.bi.pC->nData+1] = 0; } u.bi.pC->nullRow = 0; }else{ u.bi.seekResult = ((pOp->p5 & OPFLAG_USESEEKRESULT) ? u.bi.pC->seekResult : 0); if( u.bi.pData->flags & MEM_Zero ){ u.bi.nZero = u.bi.pData->u.nZero; }else{ u.bi.nZero = 0; } sqlite3BtreeSetCachedRowid(u.bi.pC->pCursor, 0); rc = sqlite3BtreeInsert(u.bi.pC->pCursor, 0, u.bi.iKey, u.bi.pData->z, u.bi.pData->n, u.bi.nZero, pOp->p5 & OPFLAG_APPEND, u.bi.seekResult ); } u.bi.pC->rowidIsValid = 0; u.bi.pC->deferredMoveto = 0; u.bi.pC->cacheStatus = CACHE_STALE; /* Invoke the update-hook if required. */ if( rc==SQLITE_OK && db->xUpdateCallback && pOp->p4.z ){ u.bi.zDb = db->aDb[u.bi.pC->iDb].zName; u.bi.zTbl = pOp->p4.z; u.bi.op = ((pOp->p5 & OPFLAG_ISUPDATE) ? SQLITE_UPDATE : SQLITE_INSERT); assert( u.bi.pC->isTable ); db->xUpdateCallback(db->pUpdateArg, u.bi.op, u.bi.zDb, u.bi.zTbl, u.bi.iKey); assert( u.bi.pC->iDb>=0 ); } break; } /* Opcode: Delete P1 P2 * P4 * ** ** Delete the record at which the P1 cursor is currently pointing. ................................................................................ ** ** If P4 is not NULL, then it is the name of the table that P1 is ** pointing to. The update hook will be invoked, if it exists. ** If P4 is not NULL then the P1 cursor must have been positioned ** using OP_NotFound prior to invoking this opcode. */ case OP_Delete: { #if 0 /* local variables moved into u.bj */ int i; i64 iKey; VdbeCursor *pC; #endif /* local variables moved into u.bj */ u.bj.i = pOp->p1; u.bj.iKey = 0; assert( u.bj.i>=0 && u.bj.i<p->nCursor ); u.bj.pC = p->apCsr[u.bj.i]; assert( u.bj.pC!=0 ); assert( u.bj.pC->pCursor!=0 ); /* Only valid for real tables, no pseudotables */ /* If the update-hook will be invoked, set u.bj.iKey to the rowid of the ** row being deleted. */ if( db->xUpdateCallback && pOp->p4.z ){ assert( u.bj.pC->isTable ); assert( u.bj.pC->rowidIsValid ); /* lastRowid set by previous OP_NotFound */ u.bj.iKey = u.bj.pC->lastRowid; } rc = sqlite3VdbeCursorMoveto(u.bj.pC); if( rc ) goto abort_due_to_error; sqlite3BtreeSetCachedRowid(u.bj.pC->pCursor, 0); rc = sqlite3BtreeDelete(u.bj.pC->pCursor); u.bj.pC->cacheStatus = CACHE_STALE; /* Invoke the update-hook if required. */ if( rc==SQLITE_OK && db->xUpdateCallback && pOp->p4.z ){ const char *zDb = db->aDb[u.bj.pC->iDb].zName; const char *zTbl = pOp->p4.z; db->xUpdateCallback(db->pUpdateArg, SQLITE_DELETE, zDb, zTbl, u.bj.iKey); assert( u.bj.pC->iDb>=0 ); } if( pOp->p2 & OPFLAG_NCHANGE ) p->nChange++; break; } /* Opcode: ResetCount P1 * * ** ................................................................................ ** it is found in the database file. ** ** If the P1 cursor must be pointing to a valid row (not a NULL row) ** of a real table, not a pseudo-table. */ case OP_RowKey: case OP_RowData: { #if 0 /* local variables moved into u.bk */ int i; VdbeCursor *pC; BtCursor *pCrsr; u32 n; i64 n64; #endif /* local variables moved into u.bk */ u.bk.i = pOp->p1; pOut = &p->aMem[pOp->p2]; /* Note that RowKey and RowData are really exactly the same instruction */ assert( u.bk.i>=0 && u.bk.i<p->nCursor ); u.bk.pC = p->apCsr[u.bk.i]; assert( u.bk.pC->isTable || pOp->opcode==OP_RowKey ); assert( u.bk.pC->isIndex || pOp->opcode==OP_RowData ); assert( u.bk.pC!=0 ); assert( u.bk.pC->nullRow==0 ); assert( u.bk.pC->pseudoTable==0 ); assert( u.bk.pC->pCursor!=0 ); u.bk.pCrsr = u.bk.pC->pCursor; rc = sqlite3VdbeCursorMoveto(u.bk.pC); if( rc ) goto abort_due_to_error; if( u.bk.pC->isIndex ){ assert( !u.bk.pC->isTable ); sqlite3BtreeKeySize(u.bk.pCrsr, &u.bk.n64); if( u.bk.n64>db->aLimit[SQLITE_LIMIT_LENGTH] ){ goto too_big; } u.bk.n = (u32)u.bk.n64; }else{ sqlite3BtreeDataSize(u.bk.pCrsr, &u.bk.n); if( u.bk.n>(u32)db->aLimit[SQLITE_LIMIT_LENGTH] ){ goto too_big; } } if( sqlite3VdbeMemGrow(pOut, u.bk.n, 0) ){ goto no_mem; } pOut->n = u.bk.n; MemSetTypeFlag(pOut, MEM_Blob); if( u.bk.pC->isIndex ){ rc = sqlite3BtreeKey(u.bk.pCrsr, 0, u.bk.n, pOut->z); }else{ rc = sqlite3BtreeData(u.bk.pCrsr, 0, u.bk.n, pOut->z); } pOut->enc = SQLITE_UTF8; /* In case the blob is ever cast to text */ UPDATE_MAX_BLOBSIZE(pOut); break; } /* Opcode: Rowid P1 P2 * * * ................................................................................ ** P1 is currently point to. ** ** P1 can be either an ordinary table or a virtual table. There used to ** be a separate OP_VRowid opcode for use with virtual tables, but this ** one opcode now works for both table types. */ case OP_Rowid: { /* out2-prerelease */ #if 0 /* local variables moved into u.bl */ int i; VdbeCursor *pC; i64 v; sqlite3_vtab *pVtab; const sqlite3_module *pModule; #endif /* local variables moved into u.bl */ u.bl.i = pOp->p1; assert( u.bl.i>=0 && u.bl.i<p->nCursor ); u.bl.pC = p->apCsr[u.bl.i]; assert( u.bl.pC!=0 ); if( u.bl.pC->nullRow ){ /* Do nothing so that reg[P2] remains NULL */ break; }else if( u.bl.pC->deferredMoveto ){ u.bl.v = u.bl.pC->movetoTarget; }else if( u.bl.pC->pseudoTable ){ u.bl.v = keyToInt(u.bl.pC->iKey); #ifndef SQLITE_OMIT_VIRTUALTABLE }else if( u.bl.pC->pVtabCursor ){ u.bl.pVtab = u.bl.pC->pVtabCursor->pVtab; u.bl.pModule = u.bl.pVtab->pModule; assert( u.bl.pModule->xRowid ); if( sqlite3SafetyOff(db) ) goto abort_due_to_misuse; rc = u.bl.pModule->xRowid(u.bl.pC->pVtabCursor, &u.bl.v); sqlite3DbFree(db, p->zErrMsg); p->zErrMsg = u.bl.pVtab->zErrMsg; u.bl.pVtab->zErrMsg = 0; if( sqlite3SafetyOn(db) ) goto abort_due_to_misuse; #endif /* SQLITE_OMIT_VIRTUALTABLE */ }else{ rc = sqlite3VdbeCursorMoveto(u.bl.pC); if( rc ) goto abort_due_to_error; if( u.bl.pC->rowidIsValid ){ u.bl.v = u.bl.pC->lastRowid; }else{ assert( u.bl.pC->pCursor!=0 ); sqlite3BtreeKeySize(u.bl.pC->pCursor, &u.bl.v); u.bl.v = keyToInt(u.bl.v); } } pOut->u.i = u.bl.v; MemSetTypeFlag(pOut, MEM_Int); break; } /* Opcode: NullRow P1 * * * * ** ** Move the cursor P1 to a null row. Any OP_Column operations ** that occur while the cursor is on the null row will always ** write a NULL. */ case OP_NullRow: { #if 0 /* local variables moved into u.bm */ int i; VdbeCursor *pC; #endif /* local variables moved into u.bm */ u.bm.i = pOp->p1; assert( u.bm.i>=0 && u.bm.i<p->nCursor ); u.bm.pC = p->apCsr[u.bm.i]; assert( u.bm.pC!=0 ); u.bm.pC->nullRow = 1; u.bm.pC->rowidIsValid = 0; if( u.bm.pC->pCursor ){ sqlite3BtreeClearCursor(u.bm.pC->pCursor); } break; } /* Opcode: Last P1 P2 * * * ** ** The next use of the Rowid or Column or Next instruction for P1 ** will refer to the last entry in the database table or index. ** If the table or index is empty and P2>0, then jump immediately to P2. ** If P2 is 0 or if the table or index is not empty, fall through ** to the following instruction. */ case OP_Last: { /* jump */ #if 0 /* local variables moved into u.bn */ int i; VdbeCursor *pC; BtCursor *pCrsr; int res; #endif /* local variables moved into u.bn */ u.bn.i = pOp->p1; assert( u.bn.i>=0 && u.bn.i<p->nCursor ); u.bn.pC = p->apCsr[u.bn.i]; assert( u.bn.pC!=0 ); u.bn.pCrsr = u.bn.pC->pCursor; assert( u.bn.pCrsr!=0 ); rc = sqlite3BtreeLast(u.bn.pCrsr, &u.bn.res); u.bn.pC->nullRow = (u8)u.bn.res; u.bn.pC->deferredMoveto = 0; u.bn.pC->rowidIsValid = 0; u.bn.pC->cacheStatus = CACHE_STALE; if( u.bn.res && pOp->p2>0 ){ pc = pOp->p2 - 1; } break; } /* Opcode: Sort P1 P2 * * * ................................................................................ ** The next use of the Rowid or Column or Next instruction for P1 ** will refer to the first entry in the database table or index. ** If the table or index is empty and P2>0, then jump immediately to P2. ** If P2 is 0 or if the table or index is not empty, fall through ** to the following instruction. */ case OP_Rewind: { /* jump */ #if 0 /* local variables moved into u.bo */ int i; VdbeCursor *pC; BtCursor *pCrsr; int res; #endif /* local variables moved into u.bo */ u.bo.i = pOp->p1; assert( u.bo.i>=0 && u.bo.i<p->nCursor ); u.bo.pC = p->apCsr[u.bo.i]; assert( u.bo.pC!=0 ); if( (u.bo.pCrsr = u.bo.pC->pCursor)!=0 ){ rc = sqlite3BtreeFirst(u.bo.pCrsr, &u.bo.res); u.bo.pC->atFirst = u.bo.res==0 ?1:0; u.bo.pC->deferredMoveto = 0; u.bo.pC->cacheStatus = CACHE_STALE; u.bo.pC->rowidIsValid = 0; }else{ u.bo.res = 1; } u.bo.pC->nullRow = (u8)u.bo.res; assert( pOp->p2>0 && pOp->p2<p->nOp ); if( u.bo.res ){ pc = pOp->p2 - 1; } break; } /* Opcode: Next P1 P2 * * * ** ................................................................................ ** to the following instruction. But if the cursor backup was successful, ** jump immediately to P2. ** ** The P1 cursor must be for a real table, not a pseudo-table. */ case OP_Prev: /* jump */ case OP_Next: { /* jump */ #if 0 /* local variables moved into u.bp */ VdbeCursor *pC; BtCursor *pCrsr; int res; #endif /* local variables moved into u.bp */ CHECK_FOR_INTERRUPT; assert( pOp->p1>=0 && pOp->p1<p->nCursor ); u.bp.pC = p->apCsr[pOp->p1]; if( u.bp.pC==0 ){ break; /* See ticket #2273 */ } u.bp.pCrsr = u.bp.pC->pCursor; assert( u.bp.pCrsr ); u.bp.res = 1; assert( u.bp.pC->deferredMoveto==0 ); rc = pOp->opcode==OP_Next ? sqlite3BtreeNext(u.bp.pCrsr, &u.bp.res) : sqlite3BtreePrevious(u.bp.pCrsr, &u.bp.res); u.bp.pC->nullRow = (u8)u.bp.res; u.bp.pC->cacheStatus = CACHE_STALE; if( u.bp.res==0 ){ pc = pOp->p2 - 1; if( pOp->p5 ) p->aCounter[pOp->p5-1]++; #ifdef SQLITE_TEST sqlite3_search_count++; #endif } u.bp.pC->rowidIsValid = 0; break; } /* Opcode: IdxInsert P1 P2 P3 * P5 ** ** Register P2 holds a SQL index key made using the ** MakeRecord instructions. This opcode writes that key ................................................................................ ** P3 is a flag that provides a hint to the b-tree layer that this ** insert is likely to be an append. ** ** This instruction only works for indices. The equivalent instruction ** for tables is OP_Insert. */ case OP_IdxInsert: { /* in2 */ #if 0 /* local variables moved into u.bq */ int i; VdbeCursor *pC; BtCursor *pCrsr; int nKey; const char *zKey; #endif /* local variables moved into u.bq */ u.bq.i = pOp->p1; assert( u.bq.i>=0 && u.bq.i<p->nCursor ); assert( p->apCsr[u.bq.i]!=0 ); assert( pIn2->flags & MEM_Blob ); if( (u.bq.pCrsr = (u.bq.pC = p->apCsr[u.bq.i])->pCursor)!=0 ){ assert( u.bq.pC->isTable==0 ); rc = ExpandBlob(pIn2); if( rc==SQLITE_OK ){ u.bq.nKey = pIn2->n; u.bq.zKey = pIn2->z; rc = sqlite3BtreeInsert(u.bq.pCrsr, u.bq.zKey, u.bq.nKey, "", 0, 0, pOp->p3, ((pOp->p5 & OPFLAG_USESEEKRESULT) ? u.bq.pC->seekResult : 0) ); assert( u.bq.pC->deferredMoveto==0 ); u.bq.pC->cacheStatus = CACHE_STALE; } } break; } /* Opcode: IdxDelete P1 P2 P3 * * ** ** The content of P3 registers starting at register P2 form ** an unpacked index key. This opcode removes that entry from the ** index opened by cursor P1. */ case OP_IdxDelete: { #if 0 /* local variables moved into u.br */ int i; VdbeCursor *pC; BtCursor *pCrsr; #endif /* local variables moved into u.br */ u.br.i = pOp->p1; assert( pOp->p3>0 ); assert( pOp->p2>0 && pOp->p2+pOp->p3<=p->nMem+1 ); assert( u.br.i>=0 && u.br.i<p->nCursor ); assert( p->apCsr[u.br.i]!=0 ); if( (u.br.pCrsr = (u.br.pC = p->apCsr[u.br.i])->pCursor)!=0 ){ int res; UnpackedRecord r; r.pKeyInfo = u.br.pC->pKeyInfo; r.nField = (u16)pOp->p3; r.flags = 0; r.aMem = &p->aMem[pOp->p2]; rc = sqlite3BtreeMovetoUnpacked(u.br.pCrsr, &r, 0, 0, &res); if( rc==SQLITE_OK && res==0 ){ rc = sqlite3BtreeDelete(u.br.pCrsr); } assert( u.br.pC->deferredMoveto==0 ); u.br.pC->cacheStatus = CACHE_STALE; } break; } /* Opcode: IdxRowid P1 P2 * * * ** ** Write into register P2 an integer which is the last entry in the record at ** the end of the index key pointed to by cursor P1. This integer should be ** the rowid of the table entry to which this index entry points. ** ** See also: Rowid, MakeRecord. */ case OP_IdxRowid: { /* out2-prerelease */ #if 0 /* local variables moved into u.bs */ int i; BtCursor *pCrsr; VdbeCursor *pC; i64 rowid; #endif /* local variables moved into u.bs */ u.bs.i = pOp->p1; assert( u.bs.i>=0 && u.bs.i<p->nCursor ); assert( p->apCsr[u.bs.i]!=0 ); if( (u.bs.pCrsr = (u.bs.pC = p->apCsr[u.bs.i])->pCursor)!=0 ){ rc = sqlite3VdbeCursorMoveto(u.bs.pC); if( rc ) goto abort_due_to_error; assert( u.bs.pC->deferredMoveto==0 ); assert( u.bs.pC->isTable==0 ); if( !u.bs.pC->nullRow ){ rc = sqlite3VdbeIdxRowid(u.bs.pCrsr, &u.bs.rowid); if( rc!=SQLITE_OK ){ goto abort_due_to_error; } MemSetTypeFlag(pOut, MEM_Int); pOut->u.i = u.bs.rowid; } } break; } /* Opcode: IdxGE P1 P2 P3 P4 P5 ** ................................................................................ ** Otherwise fall through to the next instruction. ** ** If P5 is non-zero then the key value is increased by an epsilon prior ** to the comparison. This makes the opcode work like IdxLE. */ case OP_IdxLT: /* jump, in3 */ case OP_IdxGE: { /* jump, in3 */ #if 0 /* local variables moved into u.bt */ int i; VdbeCursor *pC; int res; UnpackedRecord r; #endif /* local variables moved into u.bt */ u.bt.i = pOp->p1; assert( u.bt.i>=0 && u.bt.i<p->nCursor ); assert( p->apCsr[u.bt.i]!=0 ); if( (u.bt.pC = p->apCsr[u.bt.i])->pCursor!=0 ){ assert( u.bt.pC->deferredMoveto==0 ); assert( pOp->p5==0 || pOp->p5==1 ); assert( pOp->p4type==P4_INT32 ); u.bt.r.pKeyInfo = u.bt.pC->pKeyInfo; u.bt.r.nField = (u16)pOp->p4.i; if( pOp->p5 ){ u.bt.r.flags = UNPACKED_INCRKEY | UNPACKED_IGNORE_ROWID; }else{ u.bt.r.flags = UNPACKED_IGNORE_ROWID; } u.bt.r.aMem = &p->aMem[pOp->p3]; rc = sqlite3VdbeIdxKeyCompare(u.bt.pC, &u.bt.r, &u.bt.res); if( pOp->opcode==OP_IdxLT ){ u.bt.res = -u.bt.res; }else{ assert( pOp->opcode==OP_IdxGE ); u.bt.res++; } if( u.bt.res>0 ){ pc = pOp->p2 - 1 ; } } break; } /* Opcode: Destroy P1 P2 P3 * * ................................................................................ ** movement was required (because the table being dropped was already ** the last one in the database) then a zero is stored in register P2. ** If AUTOVACUUM is disabled then a zero is stored in register P2. ** ** See also: Clear */ case OP_Destroy: { /* out2-prerelease */ #if 0 /* local variables moved into u.bu */ int iMoved; int iCnt; Vdbe *pVdbe; int iDb; #endif /* local variables moved into u.bu */ #ifndef SQLITE_OMIT_VIRTUALTABLE u.bu.iCnt = 0; for(u.bu.pVdbe=db->pVdbe; u.bu.pVdbe; u.bu.pVdbe = u.bu.pVdbe->pNext){ if( u.bu.pVdbe->magic==VDBE_MAGIC_RUN && u.bu.pVdbe->inVtabMethod<2 && u.bu.pVdbe->pc>=0 ){ u.bu.iCnt++; } } #else u.bu.iCnt = db->activeVdbeCnt; #endif if( u.bu.iCnt>1 ){ rc = SQLITE_LOCKED; p->errorAction = OE_Abort; }else{ u.bu.iDb = pOp->p3; assert( u.bu.iCnt==1 ); assert( (p->btreeMask & (1<<u.bu.iDb))!=0 ); rc = sqlite3BtreeDropTable(db->aDb[u.bu.iDb].pBt, pOp->p1, &u.bu.iMoved); MemSetTypeFlag(pOut, MEM_Int); pOut->u.i = u.bu.iMoved; #ifndef SQLITE_OMIT_AUTOVACUUM if( rc==SQLITE_OK && u.bu.iMoved!=0 ){ sqlite3RootPageMoved(&db->aDb[u.bu.iDb], u.bu.iMoved, pOp->p1); } #endif } break; } /* Opcode: Clear P1 P2 P3 ................................................................................ ** count is incremented by the number of rows in the table being cleared. ** If P3 is greater than zero, then the value stored in register P3 is ** also incremented by the number of rows in the table being cleared. ** ** See also: Destroy */ case OP_Clear: { #if 0 /* local variables moved into u.bv */ int nChange; #endif /* local variables moved into u.bv */ u.bv.nChange = 0; assert( (p->btreeMask & (1<<pOp->p2))!=0 ); rc = sqlite3BtreeClearTable( db->aDb[pOp->p2].pBt, pOp->p1, (pOp->p3 ? &u.bv.nChange : 0) ); if( pOp->p3 ){ p->nChange += u.bv.nChange; if( pOp->p3>0 ){ p->aMem[pOp->p3].u.i += u.bv.nChange; } } break; } /* Opcode: CreateTable P1 P2 * * * ** ................................................................................ ** P1>1. Write the root page number of the new table into ** register P2. ** ** See documentation on OP_CreateTable for additional information. */ case OP_CreateIndex: /* out2-prerelease */ case OP_CreateTable: { /* out2-prerelease */ #if 0 /* local variables moved into u.bw */ int pgno; int flags; Db *pDb; #endif /* local variables moved into u.bw */ u.bw.pgno = 0; assert( pOp->p1>=0 && pOp->p1<db->nDb ); assert( (p->btreeMask & (1<<pOp->p1))!=0 ); u.bw.pDb = &db->aDb[pOp->p1]; assert( u.bw.pDb->pBt!=0 ); if( pOp->opcode==OP_CreateTable ){ /* u.bw.flags = BTREE_INTKEY; */ u.bw.flags = BTREE_LEAFDATA|BTREE_INTKEY; }else{ u.bw.flags = BTREE_ZERODATA; } rc = sqlite3BtreeCreateTable(u.bw.pDb->pBt, &u.bw.pgno, u.bw.flags); pOut->u.i = u.bw.pgno; MemSetTypeFlag(pOut, MEM_Int); break; } /* Opcode: ParseSchema P1 P2 * P4 * ** ** Read and parse all entries from the SQLITE_MASTER table of database P1 ................................................................................ ** is false, the SQLITE_MASTER table is only parsed if the rest of the ** schema is already loaded into the symbol table. ** ** This opcode invokes the parser to create a new virtual machine, ** then runs the new virtual machine. It is thus a re-entrant opcode. */ case OP_ParseSchema: { #if 0 /* local variables moved into u.bx */ int iDb; const char *zMaster; char *zSql; InitData initData; #endif /* local variables moved into u.bx */ u.bx.iDb = pOp->p1; assert( u.bx.iDb>=0 && u.bx.iDb<db->nDb ); /* If pOp->p2 is 0, then this opcode is being executed to read a ** single row, for example the row corresponding to a new index ** created by this VDBE, from the sqlite_master table. It only ** does this if the corresponding in-memory schema is currently ** loaded. Otherwise, the new index definition can be loaded along ** with the rest of the schema when it is required. ** ** Although the mutex on the BtShared object that corresponds to ** database u.bx.iDb (the database containing the sqlite_master table ** read by this instruction) is currently held, it is necessary to ** obtain the mutexes on all attached databases before checking if ** the schema of u.bx.iDb is loaded. This is because, at the start of ** the sqlite3_exec() call below, SQLite will invoke ** sqlite3BtreeEnterAll(). If all mutexes are not already held, the ** u.bx.iDb mutex may be temporarily released to avoid deadlock. If ** this happens, then some other thread may delete the in-memory ** schema of database u.bx.iDb before the SQL statement runs. The schema ** will not be reloaded becuase the db->init.busy flag is set. This ** can result in a "no such table: sqlite_master" or "malformed ** database schema" error being returned to the user. */ assert( sqlite3BtreeHoldsMutex(db->aDb[u.bx.iDb].pBt) ); sqlite3BtreeEnterAll(db); if( pOp->p2 || DbHasProperty(db, u.bx.iDb, DB_SchemaLoaded) ){ u.bx.zMaster = SCHEMA_TABLE(u.bx.iDb); u.bx.initData.db = db; u.bx.initData.iDb = pOp->p1; u.bx.initData.pzErrMsg = &p->zErrMsg; u.bx.zSql = sqlite3MPrintf(db, "SELECT name, rootpage, sql FROM '%q'.%s WHERE %s", db->aDb[u.bx.iDb].zName, u.bx.zMaster, pOp->p4.z); if( u.bx.zSql==0 ){ rc = SQLITE_NOMEM; }else{ (void)sqlite3SafetyOff(db); assert( db->init.busy==0 ); db->init.busy = 1; u.bx.initData.rc = SQLITE_OK; assert( !db->mallocFailed ); rc = sqlite3_exec(db, u.bx.zSql, sqlite3InitCallback, &u.bx.initData, 0); if( rc==SQLITE_OK ) rc = u.bx.initData.rc; sqlite3DbFree(db, u.bx.zSql); db->init.busy = 0; (void)sqlite3SafetyOn(db); } } sqlite3BtreeLeaveAll(db); if( rc==SQLITE_NOMEM ){ goto no_mem; } break; } #if !defined(SQLITE_OMIT_ANALYZE) && !defined(SQLITE_OMIT_PARSER) /* Opcode: LoadAnalysis P1 * * * * ** ** Read the sqlite_stat1 table for database P1 and load the content ** of that table into the internal index hash table. This will cause ** the analysis to be used when preparing all subsequent queries. */ case OP_LoadAnalysis: { assert( pOp->p1>=0 && pOp->p1<db->nDb ); rc = sqlite3AnalysisLoad(db, pOp->p1); break; } #endif /* !defined(SQLITE_OMIT_ANALYZE) && !defined(SQLITE_OMIT_PARSER) */ /* Opcode: DropTable P1 * * P4 * ** ** Remove the internal (in-memory) data structures that describe ** the table named P4 in database P1. This is called after a table ** is dropped in order to keep the internal representation of the ** schema consistent with what is on disk. ................................................................................ ** ** If P5 is not zero, the check is done on the auxiliary database ** file, not the main database file. ** ** This opcode is used to implement the integrity_check pragma. */ case OP_IntegrityCk: { #if 0 /* local variables moved into u.by */ int nRoot; /* Number of tables to check. (Number of root pages.) */ int *aRoot; /* Array of rootpage numbers for tables to be checked */ int j; /* Loop counter */ int nErr; /* Number of errors reported */ char *z; /* Text of the error report */ Mem *pnErr; /* Register keeping track of errors remaining */ #endif /* local variables moved into u.by */ u.by.nRoot = pOp->p2; assert( u.by.nRoot>0 ); u.by.aRoot = sqlite3DbMallocRaw(db, sizeof(int)*(u.by.nRoot+1) ); if( u.by.aRoot==0 ) goto no_mem; assert( pOp->p3>0 && pOp->p3<=p->nMem ); u.by.pnErr = &p->aMem[pOp->p3]; assert( (u.by.pnErr->flags & MEM_Int)!=0 ); assert( (u.by.pnErr->flags & (MEM_Str|MEM_Blob))==0 ); pIn1 = &p->aMem[pOp->p1]; for(u.by.j=0; u.by.j<u.by.nRoot; u.by.j++){ u.by.aRoot[u.by.j] = (int)sqlite3VdbeIntValue(&pIn1[u.by.j]); } u.by.aRoot[u.by.j] = 0; assert( pOp->p5<db->nDb ); assert( (p->btreeMask & (1<<pOp->p5))!=0 ); u.by.z = sqlite3BtreeIntegrityCheck(db->aDb[pOp->p5].pBt, u.by.aRoot, u.by.nRoot, (int)u.by.pnErr->u.i, &u.by.nErr); sqlite3DbFree(db, u.by.aRoot); u.by.pnErr->u.i -= u.by.nErr; sqlite3VdbeMemSetNull(pIn1); if( u.by.nErr==0 ){ assert( u.by.z==0 ); }else if( u.by.z==0 ){ goto no_mem; }else{ sqlite3VdbeMemSetStr(pIn1, u.by.z, -1, SQLITE_UTF8, sqlite3_free); } UPDATE_MAX_BLOBSIZE(pIn1); sqlite3VdbeChangeEncoding(pIn1, encoding); break; } #endif /* SQLITE_OMIT_INTEGRITY_CHECK */ ................................................................................ ** ** Insert the integer value held by register P2 into a boolean index ** held in register P1. ** ** An assertion fails if P2 is not an integer. */ case OP_RowSetAdd: { /* in2 */ #if 0 /* local variables moved into u.bz */ Mem *pIdx; Mem *pVal; #endif /* local variables moved into u.bz */ assert( pOp->p1>0 && pOp->p1<=p->nMem ); u.bz.pIdx = &p->aMem[pOp->p1]; assert( pOp->p2>0 && pOp->p2<=p->nMem ); u.bz.pVal = &p->aMem[pOp->p2]; assert( (u.bz.pVal->flags & MEM_Int)!=0 ); if( (u.bz.pIdx->flags & MEM_RowSet)==0 ){ sqlite3VdbeMemSetRowSet(u.bz.pIdx); if( (u.bz.pIdx->flags & MEM_RowSet)==0 ) goto no_mem; } sqlite3RowSetInsert(u.bz.pIdx->u.pRowSet, u.bz.pVal->u.i); break; } /* Opcode: RowSetRead P1 P2 P3 * * ** ** Extract the smallest value from boolean index P1 and put that value into ** register P3. Or, if boolean index P1 is initially empty, leave P3 ** unchanged and jump to instruction P2. */ case OP_RowSetRead: { /* jump, out3 */ #if 0 /* local variables moved into u.ca */ Mem *pIdx; i64 val; #endif /* local variables moved into u.ca */ assert( pOp->p1>0 && pOp->p1<=p->nMem ); CHECK_FOR_INTERRUPT; u.ca.pIdx = &p->aMem[pOp->p1]; pOut = &p->aMem[pOp->p3]; if( (u.ca.pIdx->flags & MEM_RowSet)==0 || sqlite3RowSetNext(u.ca.pIdx->u.pRowSet, &u.ca.val)==0 ){ /* The boolean index is empty */ sqlite3VdbeMemSetNull(u.ca.pIdx); pc = pOp->p2 - 1; }else{ /* A value was pulled from the index */ assert( pOp->p3>0 && pOp->p3<=p->nMem ); sqlite3VdbeMemSetInt64(pOut, u.ca.val); } break; } /* Opcode: RowSetTest P1 P2 P3 P4 ** ** Register P3 is assumed to hold a 64-bit integer value. If register P1 ................................................................................ ** (b) when P4==-1 there is no need to insert the value, as it will ** never be tested for, and (c) when a value that is part of set X is ** inserted, there is no need to search to see if the same value was ** previously inserted as part of set X (only if it was previously ** inserted as part of some other set). */ case OP_RowSetTest: { /* jump, in1, in3 */ #if 0 /* local variables moved into u.cb */ int iSet; int exists; #endif /* local variables moved into u.cb */ u.cb.iSet = pOp->p4.i; assert( pIn3->flags&MEM_Int ); /* If there is anything other than a rowset object in memory cell P1, ** delete it now and initialize P1 with an empty rowset */ if( (pIn1->flags & MEM_RowSet)==0 ){ sqlite3VdbeMemSetRowSet(pIn1); if( (pIn1->flags & MEM_RowSet)==0 ) goto no_mem; } assert( pOp->p4type==P4_INT32 ); assert( u.cb.iSet==-1 || u.cb.iSet>=0 ); if( u.cb.iSet ){ u.cb.exists = sqlite3RowSetTest(pIn1->u.pRowSet, (u8)(u.cb.iSet>=0 ? u.cb.iSet & 0xf : 0xff), pIn3->u.i); if( u.cb.exists ){ pc = pOp->p2 - 1; break; } } if( u.cb.iSet>=0 ){ sqlite3RowSetInsert(pIn1->u.pRowSet, pIn3->u.i); } break; } #ifndef SQLITE_OMIT_TRIGGER ................................................................................ /* Opcode: ContextPush * * * ** ** Save the current Vdbe context such that it can be restored by a ContextPop ** opcode. The context stores the last insert row id, the last statement change ** count, and the current statement change count. */ case OP_ContextPush: { #if 0 /* local variables moved into u.cc */ int i; Context *pContext; #endif /* local variables moved into u.cc */ u.cc.i = p->contextStackTop++; assert( u.cc.i>=0 ); /* FIX ME: This should be allocated as part of the vdbe at compile-time */ if( u.cc.i>=p->contextStackDepth ){ p->contextStackDepth = u.cc.i+1; p->contextStack = sqlite3DbReallocOrFree(db, p->contextStack, sizeof(Context)*(u.cc.i+1)); if( p->contextStack==0 ) goto no_mem; } u.cc.pContext = &p->contextStack[u.cc.i]; u.cc.pContext->lastRowid = db->lastRowid; u.cc.pContext->nChange = p->nChange; break; } /* Opcode: ContextPop * * * ** ** Restore the Vdbe context to the state it was in when contextPush was last ** executed. The context stores the last insert row id, the last statement ** change count, and the current statement change count. */ case OP_ContextPop: { #if 0 /* local variables moved into u.cd */ Context *pContext; #endif /* local variables moved into u.cd */ u.cd.pContext = &p->contextStack[--p->contextStackTop]; assert( p->contextStackTop>=0 ); db->lastRowid = u.cd.pContext->lastRowid; p->nChange = u.cd.pContext->nChange; break; } #endif /* #ifndef SQLITE_OMIT_TRIGGER */ #ifndef SQLITE_OMIT_AUTOINCREMENT /* Opcode: MemMax P1 P2 * * * ** ................................................................................ ** structure that specifies the function. Use register ** P3 as the accumulator. ** ** The P5 arguments are taken from register P2 and its ** successors. */ case OP_AggStep: { #if 0 /* local variables moved into u.ce */ int n; int i; Mem *pMem; Mem *pRec; sqlite3_context ctx; sqlite3_value **apVal; #endif /* local variables moved into u.ce */ u.ce.n = pOp->p5; assert( u.ce.n>=0 ); u.ce.pRec = &p->aMem[pOp->p2]; u.ce.apVal = p->apArg; assert( u.ce.apVal || u.ce.n==0 ); for(u.ce.i=0; u.ce.i<u.ce.n; u.ce.i++, u.ce.pRec++){ u.ce.apVal[u.ce.i] = u.ce.pRec; storeTypeInfo(u.ce.pRec, encoding); } u.ce.ctx.pFunc = pOp->p4.pFunc; assert( pOp->p3>0 && pOp->p3<=p->nMem ); u.ce.ctx.pMem = u.ce.pMem = &p->aMem[pOp->p3]; u.ce.pMem->n++; u.ce.ctx.s.flags = MEM_Null; u.ce.ctx.s.z = 0; u.ce.ctx.s.zMalloc = 0; u.ce.ctx.s.xDel = 0; u.ce.ctx.s.db = db; u.ce.ctx.isError = 0; u.ce.ctx.pColl = 0; if( u.ce.ctx.pFunc->flags & SQLITE_FUNC_NEEDCOLL ){ assert( pOp>p->aOp ); assert( pOp[-1].p4type==P4_COLLSEQ ); assert( pOp[-1].opcode==OP_CollSeq ); u.ce.ctx.pColl = pOp[-1].p4.pColl; } (u.ce.ctx.pFunc->xStep)(&u.ce.ctx, u.ce.n, u.ce.apVal); if( u.ce.ctx.isError ){ sqlite3SetString(&p->zErrMsg, db, "%s", sqlite3_value_text(&u.ce.ctx.s)); rc = u.ce.ctx.isError; } sqlite3VdbeMemRelease(&u.ce.ctx.s); break; } /* Opcode: AggFinal P1 P2 * P4 * ** ** Execute the finalizer function for an aggregate. P1 is ** the memory location that is the accumulator for the aggregate. ................................................................................ ** P4 is a pointer to the FuncDef for this function. The P2 ** argument is not used by this opcode. It is only there to disambiguate ** functions that can take varying numbers of arguments. The ** P4 argument is only needed for the degenerate case where ** the step function was not previously called. */ case OP_AggFinal: { #if 0 /* local variables moved into u.cf */ Mem *pMem; #endif /* local variables moved into u.cf */ assert( pOp->p1>0 && pOp->p1<=p->nMem ); u.cf.pMem = &p->aMem[pOp->p1]; assert( (u.cf.pMem->flags & ~(MEM_Null|MEM_Agg))==0 ); rc = sqlite3VdbeMemFinalize(u.cf.pMem, pOp->p4.pFunc); if( rc==SQLITE_ERROR ){ sqlite3SetString(&p->zErrMsg, db, "%s", sqlite3_value_text(u.cf.pMem)); } sqlite3VdbeChangeEncoding(u.cf.pMem, encoding); UPDATE_MAX_BLOBSIZE(u.cf.pMem); if( sqlite3VdbeMemTooBig(u.cf.pMem) ){ goto too_big; } break; } #if !defined(SQLITE_OMIT_VACUUM) && !defined(SQLITE_OMIT_ATTACH) ................................................................................ /* Opcode: IncrVacuum P1 P2 * * * ** ** Perform a single step of the incremental vacuum procedure on ** the P1 database. If the vacuum has finished, jump to instruction ** P2. Otherwise, fall through to the next instruction. */ case OP_IncrVacuum: { /* jump */ #if 0 /* local variables moved into u.cg */ Btree *pBt; #endif /* local variables moved into u.cg */ assert( pOp->p1>=0 && pOp->p1<db->nDb ); assert( (p->btreeMask & (1<<pOp->p1))!=0 ); u.cg.pBt = db->aDb[pOp->p1].pBt; rc = sqlite3BtreeIncrVacuum(u.cg.pBt); if( rc==SQLITE_DONE ){ pc = pOp->p2 - 1; rc = SQLITE_OK; } break; } #endif ................................................................................ ** ** P2 contains the root-page of the table to lock. ** ** P4 contains a pointer to the name of the table being locked. This is only ** used to generate an error message if the lock cannot be obtained. */ case OP_TableLock: { #if 0 /* local variables moved into u.ch */ int p1; u8 isWriteLock; #endif /* local variables moved into u.ch */ u.ch.p1 = pOp->p1; u.ch.isWriteLock = (u8)pOp->p3; assert( u.ch.p1>=0 && u.ch.p1<db->nDb ); assert( (p->btreeMask & (1<<u.ch.p1))!=0 ); assert( u.ch.isWriteLock==0 || u.ch.isWriteLock==1 ); rc = sqlite3BtreeLockTable(db->aDb[u.ch.p1].pBt, pOp->p2, u.ch.isWriteLock); if( (rc&0xFF)==SQLITE_LOCKED ){ const char *z = pOp->p4.z; sqlite3SetString(&p->zErrMsg, db, "database table is locked: %s", z); } break; } #endif /* SQLITE_OMIT_SHARED_CACHE */ ................................................................................ ** xBegin method for that table. ** ** Also, whether or not P4 is set, check that this is not being called from ** within a callback to a virtual table xSync() method. If it is, the error ** code will be set to SQLITE_LOCKED. */ case OP_VBegin: { #if 0 /* local variables moved into u.ci */ sqlite3_vtab *pVtab; #endif /* local variables moved into u.ci */ u.ci.pVtab = pOp->p4.pVtab; rc = sqlite3VtabBegin(db, u.ci.pVtab); if( u.ci.pVtab ){ sqlite3DbFree(db, p->zErrMsg); p->zErrMsg = u.ci.pVtab->zErrMsg; u.ci.pVtab->zErrMsg = 0; } break; } #endif /* SQLITE_OMIT_VIRTUALTABLE */ #ifndef SQLITE_OMIT_VIRTUALTABLE /* Opcode: VCreate P1 * * P4 * ................................................................................ /* Opcode: VOpen P1 * * P4 * ** ** P4 is a pointer to a virtual table object, an sqlite3_vtab structure. ** P1 is a cursor number. This opcode opens a cursor to the virtual ** table and stores that cursor in P1. */ case OP_VOpen: { #if 0 /* local variables moved into u.cj */ VdbeCursor *pCur; sqlite3_vtab_cursor *pVtabCursor; sqlite3_vtab *pVtab; sqlite3_module *pModule; #endif /* local variables moved into u.cj */ u.cj.pCur = 0; u.cj.pVtabCursor = 0; u.cj.pVtab = pOp->p4.pVtab; u.cj.pModule = (sqlite3_module *)u.cj.pVtab->pModule; assert(u.cj.pVtab && u.cj.pModule); if( sqlite3SafetyOff(db) ) goto abort_due_to_misuse; rc = u.cj.pModule->xOpen(u.cj.pVtab, &u.cj.pVtabCursor); sqlite3DbFree(db, p->zErrMsg); p->zErrMsg = u.cj.pVtab->zErrMsg; u.cj.pVtab->zErrMsg = 0; if( sqlite3SafetyOn(db) ) goto abort_due_to_misuse; if( SQLITE_OK==rc ){ /* Initialize sqlite3_vtab_cursor base class */ u.cj.pVtabCursor->pVtab = u.cj.pVtab; /* Initialise vdbe cursor object */ u.cj.pCur = allocateCursor(p, pOp->p1, 0, -1, 0); if( u.cj.pCur ){ u.cj.pCur->pVtabCursor = u.cj.pVtabCursor; u.cj.pCur->pModule = u.cj.pVtabCursor->pVtab->pModule; }else{ db->mallocFailed = 1; u.cj.pModule->xClose(u.cj.pVtabCursor); } } break; } #endif /* SQLITE_OMIT_VIRTUALTABLE */ #ifndef SQLITE_OMIT_VIRTUALTABLE ................................................................................ ** xFilter method. Registers P3+2..P3+1+argc are the argc ** additional parameters which are passed to ** xFilter as argv. Register P3+2 becomes argv[0] when passed to xFilter. ** ** A jump is made to P2 if the result set after filtering would be empty. */ case OP_VFilter: { /* jump */ #if 0 /* local variables moved into u.ck */ int nArg; int iQuery; const sqlite3_module *pModule; Mem *pQuery; Mem *pArgc; sqlite3_vtab_cursor *pVtabCursor; sqlite3_vtab *pVtab; VdbeCursor *pCur; int res; int i; Mem **apArg; #endif /* local variables moved into u.ck */ u.ck.pQuery = &p->aMem[pOp->p3]; u.ck.pArgc = &u.ck.pQuery[1]; u.ck.pCur = p->apCsr[pOp->p1]; REGISTER_TRACE(pOp->p3, u.ck.pQuery); assert( u.ck.pCur->pVtabCursor ); u.ck.pVtabCursor = u.ck.pCur->pVtabCursor; u.ck.pVtab = u.ck.pVtabCursor->pVtab; u.ck.pModule = u.ck.pVtab->pModule; /* Grab the index number and argc parameters */ assert( (u.ck.pQuery->flags&MEM_Int)!=0 && u.ck.pArgc->flags==MEM_Int ); u.ck.nArg = (int)u.ck.pArgc->u.i; u.ck.iQuery = (int)u.ck.pQuery->u.i; /* Invoke the xFilter method */ { u.ck.res = 0; u.ck.apArg = p->apArg; for(u.ck.i = 0; u.ck.i<u.ck.nArg; u.ck.i++){ u.ck.apArg[u.ck.i] = &u.ck.pArgc[u.ck.i+1]; storeTypeInfo(u.ck.apArg[u.ck.i], 0); } if( sqlite3SafetyOff(db) ) goto abort_due_to_misuse; sqlite3VtabLock(u.ck.pVtab); p->inVtabMethod = 1; rc = u.ck.pModule->xFilter(u.ck.pVtabCursor, u.ck.iQuery, pOp->p4.z, u.ck.nArg, u.ck.apArg); p->inVtabMethod = 0; sqlite3DbFree(db, p->zErrMsg); p->zErrMsg = u.ck.pVtab->zErrMsg; u.ck.pVtab->zErrMsg = 0; sqlite3VtabUnlock(db, u.ck.pVtab); if( rc==SQLITE_OK ){ u.ck.res = u.ck.pModule->xEof(u.ck.pVtabCursor); } if( sqlite3SafetyOn(db) ) goto abort_due_to_misuse; if( u.ck.res ){ pc = pOp->p2 - 1; } } u.ck.pCur->nullRow = 0; break; } #endif /* SQLITE_OMIT_VIRTUALTABLE */ #ifndef SQLITE_OMIT_VIRTUALTABLE /* Opcode: VColumn P1 P2 P3 * * ** ** Store the value of the P2-th column of ** the row of the virtual-table that the ** P1 cursor is pointing to into register P3. */ case OP_VColumn: { #if 0 /* local variables moved into u.cl */ sqlite3_vtab *pVtab; const sqlite3_module *pModule; Mem *pDest; sqlite3_context sContext; #endif /* local variables moved into u.cl */ VdbeCursor *pCur = p->apCsr[pOp->p1]; assert( pCur->pVtabCursor ); assert( pOp->p3>0 && pOp->p3<=p->nMem ); u.cl.pDest = &p->aMem[pOp->p3]; if( pCur->nullRow ){ sqlite3VdbeMemSetNull(u.cl.pDest); break; } u.cl.pVtab = pCur->pVtabCursor->pVtab; u.cl.pModule = u.cl.pVtab->pModule; assert( u.cl.pModule->xColumn ); memset(&u.cl.sContext, 0, sizeof(u.cl.sContext)); /* The output cell may already have a buffer allocated. Move ** the current contents to u.cl.sContext.s so in case the user-function ** can use the already allocated buffer instead of allocating a ** new one. */ sqlite3VdbeMemMove(&u.cl.sContext.s, u.cl.pDest); MemSetTypeFlag(&u.cl.sContext.s, MEM_Null); if( sqlite3SafetyOff(db) ) goto abort_due_to_misuse; rc = u.cl.pModule->xColumn(pCur->pVtabCursor, &u.cl.sContext, pOp->p2); sqlite3DbFree(db, p->zErrMsg); p->zErrMsg = u.cl.pVtab->zErrMsg; u.cl.pVtab->zErrMsg = 0; /* Copy the result of the function to the P3 register. We ** do this regardless of whether or not an error occurred to ensure any ** dynamic allocation in u.cl.sContext.s (a Mem struct) is released. */ sqlite3VdbeChangeEncoding(&u.cl.sContext.s, encoding); REGISTER_TRACE(pOp->p3, u.cl.pDest); sqlite3VdbeMemMove(u.cl.pDest, &u.cl.sContext.s); UPDATE_MAX_BLOBSIZE(u.cl.pDest); if( sqlite3SafetyOn(db) ){ goto abort_due_to_misuse; } if( sqlite3VdbeMemTooBig(u.cl.pDest) ){ goto too_big; } break; } #endif /* SQLITE_OMIT_VIRTUALTABLE */ #ifndef SQLITE_OMIT_VIRTUALTABLE ................................................................................ /* Opcode: VNext P1 P2 * * * ** ** Advance virtual table P1 to the next row in its result set and ** jump to instruction P2. Or, if the virtual table has reached ** the end of its result set, then fall through to the next instruction. */ case OP_VNext: { /* jump */ #if 0 /* local variables moved into u.cm */ sqlite3_vtab *pVtab; const sqlite3_module *pModule; int res; VdbeCursor *pCur; #endif /* local variables moved into u.cm */ u.cm.res = 0; u.cm.pCur = p->apCsr[pOp->p1]; assert( u.cm.pCur->pVtabCursor ); if( u.cm.pCur->nullRow ){ break; } u.cm.pVtab = u.cm.pCur->pVtabCursor->pVtab; u.cm.pModule = u.cm.pVtab->pModule; assert( u.cm.pModule->xNext ); /* Invoke the xNext() method of the module. There is no way for the ** underlying implementation to return an error if one occurs during ** xNext(). Instead, if an error occurs, true is returned (indicating that ** data is available) and the error code returned when xColumn or ** some other method is next invoked on the save virtual table cursor. */ if( sqlite3SafetyOff(db) ) goto abort_due_to_misuse; sqlite3VtabLock(u.cm.pVtab); p->inVtabMethod = 1; rc = u.cm.pModule->xNext(u.cm.pCur->pVtabCursor); p->inVtabMethod = 0; sqlite3DbFree(db, p->zErrMsg); p->zErrMsg = u.cm.pVtab->zErrMsg; u.cm.pVtab->zErrMsg = 0; sqlite3VtabUnlock(db, u.cm.pVtab); if( rc==SQLITE_OK ){ u.cm.res = u.cm.pModule->xEof(u.cm.pCur->pVtabCursor); } if( sqlite3SafetyOn(db) ) goto abort_due_to_misuse; if( !u.cm.res ){ /* If there is data, jump to P2 */ pc = pOp->p2 - 1; } break; } #endif /* SQLITE_OMIT_VIRTUALTABLE */ ................................................................................ /* Opcode: VRename P1 * * P4 * ** ** P4 is a pointer to a virtual table object, an sqlite3_vtab structure. ** This opcode invokes the corresponding xRename method. The value ** in register P1 is passed as the zName argument to the xRename method. */ case OP_VRename: { #if 0 /* local variables moved into u.cn */ sqlite3_vtab *pVtab; Mem *pName; #endif /* local variables moved into u.cn */ u.cn.pVtab = pOp->p4.pVtab; u.cn.pName = &p->aMem[pOp->p1]; assert( u.cn.pVtab->pModule->xRename ); REGISTER_TRACE(pOp->p1, u.cn.pName); Stringify(u.cn.pName, encoding); if( sqlite3SafetyOff(db) ) goto abort_due_to_misuse; sqlite3VtabLock(u.cn.pVtab); rc = u.cn.pVtab->pModule->xRename(u.cn.pVtab, u.cn.pName->z); sqlite3DbFree(db, p->zErrMsg); p->zErrMsg = u.cn.pVtab->zErrMsg; u.cn.pVtab->zErrMsg = 0; sqlite3VtabUnlock(db, u.cn.pVtab); if( sqlite3SafetyOn(db) ) goto abort_due_to_misuse; break; } #endif #ifndef SQLITE_OMIT_VIRTUALTABLE ................................................................................ ** a row to delete. ** ** P1 is a boolean flag. If it is set to true and the xUpdate call ** is successful, then the value returned by sqlite3_last_insert_rowid() ** is set to the value of the rowid for the row just inserted. */ case OP_VUpdate: { #if 0 /* local variables moved into u.co */ sqlite3_vtab *pVtab; sqlite3_module *pModule; int nArg; int i; sqlite_int64 rowid; Mem **apArg; Mem *pX; #endif /* local variables moved into u.co */ u.co.pVtab = pOp->p4.pVtab; u.co.pModule = (sqlite3_module *)u.co.pVtab->pModule; u.co.nArg = pOp->p2; assert( pOp->p4type==P4_VTAB ); if( u.co.pModule->xUpdate==0 ){ sqlite3SetString(&p->zErrMsg, db, "read-only table"); rc = SQLITE_ERROR; }else{ u.co.apArg = p->apArg; u.co.pX = &p->aMem[pOp->p3]; for(u.co.i=0; u.co.i<u.co.nArg; u.co.i++){ storeTypeInfo(u.co.pX, 0); u.co.apArg[u.co.i] = u.co.pX; u.co.pX++; } if( sqlite3SafetyOff(db) ) goto abort_due_to_misuse; sqlite3VtabLock(u.co.pVtab); rc = u.co.pModule->xUpdate(u.co.pVtab, u.co.nArg, u.co.apArg, &u.co.rowid); sqlite3DbFree(db, p->zErrMsg); p->zErrMsg = u.co.pVtab->zErrMsg; u.co.pVtab->zErrMsg = 0; sqlite3VtabUnlock(db, u.co.pVtab); if( sqlite3SafetyOn(db) ) goto abort_due_to_misuse; if( pOp->p1 && rc==SQLITE_OK ){ assert( u.co.nArg>1 && u.co.apArg[0] && (u.co.apArg[0]->flags&MEM_Null) ); db->lastRowid = u.co.rowid; } p->nChange++; } break; } #endif /* SQLITE_OMIT_VIRTUALTABLE */ #ifndef SQLITE_OMIT_PAGER_PRAGMAS /* Opcode: Pagecount P1 P2 * * * ** ** Write the current number of pages in database P1 to memory cell P2. */ case OP_Pagecount: { /* out2-prerelease */ #if 0 /* local variables moved into u.cp */ int p1; int nPage; Pager *pPager; #endif /* local variables moved into u.cp */ u.cp.p1 = pOp->p1; u.cp.pPager = sqlite3BtreePager(db->aDb[u.cp.p1].pBt); rc = sqlite3PagerPagecount(u.cp.pPager, &u.cp.nPage); if( rc==SQLITE_OK ){ pOut->flags = MEM_Int; pOut->u.i = u.cp.nPage; } break; } #endif #ifndef SQLITE_OMIT_TRACE /* Opcode: Trace * * * P4 * ** ** If tracing is enabled (by the sqlite3_trace()) interface, then ** the UTF-8 string contained in P4 is emitted on the trace callback. */ case OP_Trace: { #if 0 /* local variables moved into u.cq */ char *zTrace; #endif /* local variables moved into u.cq */ u.cq.zTrace = (pOp->p4.z ? pOp->p4.z : p->zSql); if( u.cq.zTrace ){ if( db->xTrace ){ db->xTrace(db->pTraceArg, u.cq.zTrace); } #ifdef SQLITE_DEBUG if( (db->flags & SQLITE_SqlTrace)!=0 ){ sqlite3DebugPrintf("SQL-trace: %s\n", u.cq.zTrace); } #endif /* SQLITE_DEBUG */ } break; } #endif ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file contains code used to implement incremental BLOB I/O. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef SQLITE_OMIT_INCRBLOB /* ** Valid sqlite3_blob* handles point to Incrblob structures. ................................................................................ ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifdef SQLITE_ENABLE_ATOMIC_WRITE /* ** This file implements a special kind of sqlite3_file object used ** by SQLite to create journal files if the atomic-write optimization ................................................................................ ** ************************************************************************* ** ** This file contains code use to implement an in-memory rollback journal. ** The in-memory rollback journal is used to journal transactions for ** ":memory:" databases and when the journal_mode=MEMORY pragma is used. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* Forward references to internal structures */ typedef struct MemJournal MemJournal; typedef struct FilePoint FilePoint; typedef struct FileChunk FileChunk; ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains routines used for walking the parser tree for ** an SQL statement. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Walk an expression tree. Invoke the callback once for each node ** of the expression, while decending. (In other words, the callback ** is invoked before visiting children.) ................................................................................ } /* ** Call sqlite3WalkExpr() for every expression in list p or until ** an abort request is seen. */ SQLITE_PRIVATE int sqlite3WalkExprList(Walker *pWalker, ExprList *p){ int i, rc = WRC_Continue; struct ExprList_item *pItem; if( p ){ for(i=p->nExpr, pItem=p->a; i>0; i--, pItem++){ if( sqlite3WalkExpr(pWalker, pItem->pExpr) ) return WRC_Abort; } } return rc & WRC_Continue; } /* ** Walk all expressions associated with SELECT statement p. Do ** not invoke the SELECT callback on p, but do (of course) invoke ** any expr callbacks and SELECT callbacks that come from subqueries. ** Return WRC_Abort or WRC_Continue. ................................................................................ */ SQLITE_PRIVATE int sqlite3WalkSelectFrom(Walker *pWalker, Select *p){ SrcList *pSrc; int i; struct SrcList_item *pItem; pSrc = p->pSrc; if( pSrc ){ for(i=pSrc->nSrc, pItem=pSrc->a; i>0; i--, pItem++){ if( sqlite3WalkSelect(pWalker, pItem->pSelect) ){ return WRC_Abort; } } } return WRC_Continue; ................................................................................ ** ************************************************************************* ** ** This file contains routines used for walking the parser tree and ** resolve all identifiers by associating them with a particular ** table and column. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Turn the pExpr expression into an alias for the iCol-th column of the ** result set in pEList. ** ** If the result set column is a simple column reference, then this routine ................................................................................ } pDup->iTable = pEList->a[iCol].iAlias; }else if( ExprHasProperty(pOrig, EP_IntValue) || pOrig->u.zToken==0 ){ pDup = sqlite3ExprDup(db, pOrig, 0); if( pDup==0 ) return; }else{ char *zToken = pOrig->u.zToken; pOrig->u.zToken = 0; pDup = sqlite3ExprDup(db, pOrig, 0); pOrig->u.zToken = zToken; if( pDup==0 ) return; if( zToken ){ assert( (pDup->flags & (EP_Reduced|EP_TokenOnly))==0 ); pDup->flags2 |= EP2_MallocedToken; pDup->u.zToken = sqlite3DbStrDup(db, zToken); } } if( pExpr->flags & EP_ExpCollate ){ pDup->pColl = pExpr->pColl; pDup->flags |= EP_ExpCollate; } sqlite3ExprClear(db, pExpr); memcpy(pExpr, pDup, sizeof(*pExpr)); ................................................................................ ** NULL meaning that name is of the form Y.Z or Z. Any available database ** can be used. The zTable variable is the name of the table (the "Y"). This ** value can be NULL if zDb is also NULL. If zTable is NULL it ** means that the form of the name is Z and that columns from any table ** can be used. ** ** If the name cannot be resolved unambiguously, leave an error message ** in pParse and return non-zero. Return zero on success. */ static int lookupName( Parse *pParse, /* The parsing context */ const char *zDb, /* Name of the database containing table, or NULL */ const char *zTab, /* Name of table containing column, or NULL */ const char *zCol, /* Name of the column. */ NameContext *pNC, /* The name context used to resolve the name */ ................................................................................ assert( pTab->nCol>0 ); if( zTab ){ if( pItem->zAlias ){ char *zTabName = pItem->zAlias; if( sqlite3StrICmp(zTabName, zTab)!=0 ) continue; }else{ char *zTabName = pTab->zName; if( zTabName==0 || sqlite3StrICmp(zTabName, zTab)!=0 ) continue; if( zDb!=0 && sqlite3StrICmp(db->aDb[iDb].zName, zDb)!=0 ){ continue; } } } if( 0==(cntTab++) ){ pExpr->iTable = pItem->iCursor; ................................................................................ pSchema = pTab->pSchema; cntTab++; for(iCol=0; iCol < pTab->nCol; iCol++, pCol++) { if( sqlite3StrICmp(pCol->zName, zCol)==0 ){ cnt++; pExpr->iColumn = iCol==pTab->iPKey ? -1 : (i16)iCol; pExpr->pTab = pTab; if( iCol>=0 ){ testcase( iCol==31 ); testcase( iCol==32 ); if( iCol>=32 ){ *piColMask = 0xffffffff; }else{ *piColMask |= ((u32)1)<<iCol; } } break; } } } } #endif /* !defined(SQLITE_OMIT_TRIGGER) */ ................................................................................ Expr *pOrig; assert( pExpr->pLeft==0 && pExpr->pRight==0 ); assert( pExpr->x.pList==0 ); assert( pExpr->x.pSelect==0 ); pOrig = pEList->a[j].pExpr; if( !pNC->allowAgg && ExprHasProperty(pOrig, EP_Agg) ){ sqlite3ErrorMsg(pParse, "misuse of aliased aggregate %s", zAs); return 2; } resolveAlias(pParse, pEList, j, pExpr, ""); cnt = 1; pMatch = 0; assert( zTab==0 && zDb==0 ); goto lookupname_end; } ................................................................................ ** ** Because no reference was made to outer contexts, the pNC->nRef ** fields are not changed in any context. */ if( cnt==0 && zTab==0 && ExprHasProperty(pExpr,EP_DblQuoted) ){ pExpr->op = TK_STRING; pExpr->pTab = 0; return 0; } /* ** cnt==0 means there was not match. cnt>1 means there were two or ** more matches. Either way, we have an error. */ if( cnt!=1 ){ ................................................................................ ** the point where the name matched. */ for(;;){ assert( pTopNC!=0 ); pTopNC->nRef++; if( pTopNC==pNC ) break; pTopNC = pTopNC->pNext; } return 0; } else { return 1; } } /* ** This routine is callback for sqlite3WalkExpr(). ** ** Resolve symbolic names into TK_COLUMN operators for the current ................................................................................ break; } #endif /* defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY) */ /* A lone identifier is the name of a column. */ case TK_ID: { lookupName(pParse, 0, 0, pExpr->u.zToken, pNC, pExpr); return WRC_Prune; } /* A table name and column name: ID.ID ** Or a database, table and column: ID.ID.ID */ case TK_DOT: { const char *zColumn; ................................................................................ zColumn = pRight->u.zToken; }else{ assert( pRight->op==TK_DOT ); zDb = pExpr->pLeft->u.zToken; zTable = pRight->pLeft->u.zToken; zColumn = pRight->pRight->u.zToken; } lookupName(pParse, zDb, zTable, zColumn, pNC, pExpr); return WRC_Prune; } /* Resolve function names */ case TK_CONST_FUNC: case TK_FUNCTION: { ExprList *pList = pExpr->x.pList; /* The argument list */ ................................................................................ int is_agg = 0; /* True if is an aggregate function */ int auth; /* Authorization to use the function */ int nId; /* Number of characters in function name */ const char *zId; /* The function name. */ FuncDef *pDef; /* Information about the function */ u8 enc = ENC(pParse->db); /* The database encoding */ assert( !ExprHasProperty(pExpr, EP_xIsSelect) ); zId = pExpr->u.zToken; nId = sqlite3Strlen30(zId); pDef = sqlite3FindFunction(pParse->db, zId, nId, n, enc, 0); if( pDef==0 ){ pDef = sqlite3FindFunction(pParse->db, zId, nId, -1, enc, 0); if( pDef==0 ){ ................................................................................ /* FIX ME: Compute pExpr->affinity based on the expected return ** type of the function */ return WRC_Prune; } #ifndef SQLITE_OMIT_SUBQUERY case TK_SELECT: case TK_EXISTS: #endif case TK_IN: { if( ExprHasProperty(pExpr, EP_xIsSelect) ){ int nRef = pNC->nRef; #ifndef SQLITE_OMIT_CHECK if( pNC->isCheck ){ sqlite3ErrorMsg(pParse,"subqueries prohibited in CHECK constraints"); } #endif ................................................................................ ExprList *pEList, /* List of expressions to scan */ Expr *pE /* Expression we are trying to match */ ){ int i; /* Loop counter */ UNUSED_PARAMETER(pParse); if( pE->op==TK_ID || (pE->op==TK_STRING && pE->u.zToken[0]!='\'') ){ char *zCol = pE->u.zToken; for(i=0; i<pEList->nExpr; i++){ char *zAs = pEList->a[i].zName; if( zAs!=0 && sqlite3StrICmp(zAs, zCol)==0 ){ return i+1; } } ................................................................................ assert( pEList!=0 ); for(i=0, pItem=pOrderBy->a; i<pOrderBy->nExpr; i++, pItem++){ int iCol = -1; Expr *pE, *pDup; if( pItem->done ) continue; pE = pItem->pExpr; if( sqlite3ExprIsInteger(pE, &iCol) ){ if( iCol<0 || iCol>pEList->nExpr ){ resolveOutOfRangeError(pParse, "ORDER", i+1, pEList->nExpr); return 1; } }else{ iCol = resolveAsName(pParse, pEList, pE); if( iCol==0 ){ pDup = sqlite3ExprDup(db, pE, 0); if( !db->mallocFailed ){ assert(pDup); iCol = resolveOrderByTermToExprList(pParse, pSelect, pDup); } sqlite3ExprDelete(db, pDup); } if( iCol<0 ){ return 1; } } if( iCol>0 ){ CollSeq *pColl = pE->pColl; int flags = pE->flags & EP_ExpCollate; sqlite3ExprDelete(db, pE); pItem->pExpr = pE = sqlite3Expr(db, TK_INTEGER, 0); if( pE==0 ) return 1; ................................................................................ if( pOrderBy==0 ) return 0; nResult = pSelect->pEList->nExpr; pParse = pNC->pParse; for(i=0, pItem=pOrderBy->a; i<pOrderBy->nExpr; i++, pItem++){ Expr *pE = pItem->pExpr; iCol = resolveAsName(pParse, pSelect->pEList, pE); if( iCol<0 ){ return 1; /* OOM error */ } if( iCol>0 ){ /* If an AS-name match is found, mark this ORDER BY column as being ** a copy of the iCol-th result-set column. The subsequent call to ** sqlite3ResolveOrderGroupBy() will convert the expression to a ** copy of the iCol-th result-set expression. */ pItem->iCol = (u16)iCol; continue; ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains routines used for analyzing expressions and ** for generating VDBE code that evaluates expressions in SQLite. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Return the 'affinity' of the expression pExpr if any. ** ** If pExpr is a column, a reference to a column via an 'AS' alias, ** or a sub-select with a column as the return value, then the ................................................................................ } } exprSetHeight(pRoot); } } /* ** Allocate a Expr node which joins up to two subtrees. ** ** The ** Works like sqlite3Expr() except that it takes an extra Parse* ** argument and notifies the associated connection object if malloc fails. */ SQLITE_PRIVATE Expr *sqlite3PExpr( Parse *pParse, /* Parsing context */ int op, /* Expression opcode */ Expr *pLeft, /* Left operand */ Expr *pRight, /* Right operand */ const Token *pToken /* Argument token */ ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that used to generate VDBE code ** that implements the ALTER TABLE command. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** The code in this file only exists if we are not omitting the ** ALTER TABLE logic from the build. */ #ifndef SQLITE_OMIT_ALTERTABLE ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains code associated with the ANALYZE command. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef SQLITE_OMIT_ANALYZE /* ** This routine generates code that opens the sqlite_stat1 table on cursor ** iStatCur. ** ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains code used to implement the ATTACH and DETACH commands. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef SQLITE_OMIT_ATTACH /* ** Resolve an expression that was part of an ATTACH or DETACH statement. This ** is slightly different from resolving a normal SQL expression, because simple ** identifiers are treated as strings, not possible column names or aliases. ................................................................................ ** ************************************************************************* ** This file contains code used to implement the sqlite3_set_authorizer() ** API. This facility is an optional feature of the library. Embedded ** systems that do not need this facility may omit it by recompiling ** the library with -DSQLITE_OMIT_AUTHORIZATION=1 ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** All of the code in this file may be omitted by defining a single ** macro. */ #ifndef SQLITE_OMIT_AUTHORIZATION ................................................................................ ** CREATE INDEX ** DROP INDEX ** creating ID lists ** BEGIN TRANSACTION ** COMMIT ** ROLLBACK ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** This routine is called when a new SQL statement is beginning to ** be parsed. Initialize the pParse structure as needed. */ SQLITE_PRIVATE void sqlite3BeginParse(Parse *pParse, int explainFlag){ ................................................................................ #endif /* Once all the cookies have been verified and transactions opened, ** obtain the required table-locks. This is a no-op unless the ** shared-cache feature is enabled. */ codeTableLocks(pParse); sqlite3VdbeAddOp2(v, OP_Goto, 0, pParse->cookieGoto); } } /* Get the VDBE program ready for execution */ ................................................................................ SQLITE_PRIVATE void sqlite3UnlinkAndDeleteIndex(sqlite3 *db, int iDb, const char *zIdxName){ Index *pIndex; int len; Hash *pHash = &db->aDb[iDb].pSchema->idxHash; len = sqlite3Strlen30(zIdxName); pIndex = sqlite3HashInsert(pHash, zIdxName, len, 0); /* Justification of ALWAYS(): This routine is only called from the ** OP_DropIndex opcode. And there is no way that opcode will ever run ** unless the corresponding index is in the symbol table. */ if( ALWAYS(pIndex) ){ if( pIndex->pTable->pIndex==pIndex ){ pIndex->pTable->pIndex = pIndex->pNext; }else{ Index *p; /* Justification of ALWAYS(); The index must be on the list of ** indices. */ p = pIndex->pTable->pIndex; ................................................................................ /* If one or more of the auxiliary database files has been closed, ** then remove them from the auxiliary database list. We take the ** opportunity to do this here since we have just deleted all of the ** schema hash tables and therefore do not have to make any changes ** to any of those tables. */ #ifdef SQLITE_HAS_CODEC for(i=0; i<db->nDb; i++){ struct Db *pDb = &db->aDb[i]; if( pDb->pBt==0 ){ if( pDb->pAux && pDb->xFreeAux ) pDb->xFreeAux(pDb->pAux); pDb->pAux = 0; } } #endif for(i=j=2; i<db->nDb; i++){ struct Db *pDb = &db->aDb[i]; if( pDb->pBt==0 ){ sqlite3DbFree(db, pDb->zName); pDb->zName = 0; continue; } ................................................................................ CollSeq *pColl; pColl = sqlite3FindCollSeq(db, enc, zName, initbusy); if( !initbusy && (!pColl || !pColl->xCmp) ){ pColl = sqlite3GetCollSeq(db, pColl, zName); if( !pColl ){ sqlite3ErrorMsg(pParse, "no such collation sequence: %s", zName); pColl = 0; } } return pColl; } ................................................................................ ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file contains functions used to access the internal hash tables ** of user defined functions and collation sequences. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Invoke the 'collation needed' callback to request a collation sequence ** in the database text encoding of name zName, length nName. ** If the collation sequence ................................................................................ ** from the main database is substituted, if one is available. */ SQLITE_PRIVATE int sqlite3CheckCollSeq(Parse *pParse, CollSeq *pColl){ if( pColl ){ const char *zName = pColl->zName; CollSeq *p = sqlite3GetCollSeq(pParse->db, pColl, zName); if( !p ){ if( pParse->nErr==0 ){ sqlite3ErrorMsg(pParse, "no such collation sequence: %s", zName); } pParse->nErr++; return SQLITE_ERROR; } assert( p==pColl ); } return SQLITE_OK; } ................................................................................ FuncDef *p; /* Iterator variable */ FuncDef *pBest = 0; /* Best match found so far */ int bestScore = 0; /* Score of best match */ int h; /* Hash value */ assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE ); if( nArg<-1 ) nArg = -1; h = (sqlite3UpperToLower[(u8)zName[0]] + nName) % ArraySize(db->aFunc.a); /* First search for a match amongst the application-defined functions. */ p = functionSearch(&db->aFunc, h, zName, nName); while( p ){ int score = matchQuality(p, nArg, enc); ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that are called by the parser ** in order to generate code for DELETE FROM statements. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Look up every table that is named in pSrc. If any table is not found, ** add an error message to pParse->zErrMsg and return NULL. If all tables ** are found, return a pointer to the last table. */ ................................................................................ if( !isView && !IsVirtual(pTab) ){ for(i=1, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){ sqlite3VdbeAddOp2(v, OP_Close, iCur + i, pIdx->tnum); } sqlite3VdbeAddOp1(v, OP_Close, iCur); } } /* ** Return the number of rows that were deleted. If this routine is ** generating code because of a call to sqlite3NestedParse(), do not ** invoke the callback function. */ if( db->flags & SQLITE_CountRows && pParse->nested==0 && !pParse->trigStack ){ ................................................................................ ** This file contains the C functions that implement various SQL ** functions of SQLite. ** ** There is only one exported symbol in this file - the function ** sqliteRegisterBuildinFunctions() found at the bottom of the file. ** All other code has file scope. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Return the collating function associated with a function. */ static CollSeq *sqlite3GetFuncCollSeq(sqlite3_context *context){ return context->pColl; ................................................................................ int nVal, nSep; assert( argc==1 || argc==2 ); if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return; pAccum = (StrAccum*)sqlite3_aggregate_context(context, sizeof(*pAccum)); if( pAccum ){ sqlite3 *db = sqlite3_context_db_handle(context); int n; pAccum->useMalloc = 1; pAccum->mxAlloc = db->aLimit[SQLITE_LIMIT_LENGTH]; #ifdef SQLITE_OMIT_DEPRECATED n = context->pMem->n; #else n = sqlite3_aggregate_count(context); #endif if( n>1 ){ if( argc==2 ){ zSep = (char*)sqlite3_value_text(argv[1]); nSep = sqlite3_value_bytes(argv[1]); }else{ zSep = ","; nSep = 1; } ................................................................................ if( !db->mallocFailed ){ int rc = sqlite3_overload_function(db, "MATCH", 2); assert( rc==SQLITE_NOMEM || rc==SQLITE_OK ); if( rc==SQLITE_NOMEM ){ db->mallocFailed = 1; } } #ifdef SQLITE_SSE (void)sqlite3SseFunctions(db); #endif } /* ** Set the LIKEOPT flag on the 2-argument function with the given name. */ static void setLikeOptFlag(sqlite3 *db, const char *zName, u8 flagVal){ FuncDef *pDef; ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle INSERT statements in SQLite. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Generate code that will open a table for reading. */ SQLITE_PRIVATE void sqlite3OpenTable( Parse *p, /* Generate code into this VDBE */ ................................................................................ #endif } return 0; } #ifndef SQLITE_OMIT_AUTOINCREMENT /* ** Write out code to initialize the autoincrement logic. This code ** looks up the current autoincrement value in the sqlite_sequence ** table and stores that value in a register. Code generated by ** autoIncStep() will keep that register holding the largest ** rowid value. Code generated by autoIncEnd() will write the new ** largest value of the counter back into the sqlite_sequence table. ** ** This routine returns the index of the mem[] cell that contains ** the maximum rowid counter. ** ** Three consecutive registers are allocated by this routine. The ** first two hold the name of the target table and the maximum rowid ** inserted into the target table, respectively. ** The third holds the rowid in sqlite_sequence where we will ** write back the revised maximum rowid. This routine returns the ** index of the second of these three registers. */ static int autoIncBegin( Parse *pParse, /* Parsing context */ int iDb, /* Index of the database holding pTab */ Table *pTab /* The table we are writing to */ ){ int memId = 0; /* Register holding maximum rowid */ if( pTab->tabFlags & TF_Autoincrement ){ Vdbe *v = pParse->pVdbe; Db *pDb = &pParse->db->aDb[iDb]; int iCur = pParse->nTab++; int addr; /* Address of the top of the loop */ assert( v ); pParse->nMem++; /* Holds name of table */ memId = ++pParse->nMem; pParse->nMem++; sqlite3OpenTable(pParse, iCur, iDb, pDb->pSchema->pSeqTab, OP_OpenRead); addr = sqlite3VdbeCurrentAddr(v); sqlite3VdbeAddOp4(v, OP_String8, 0, memId-1, 0, pTab->zName, 0); sqlite3VdbeAddOp2(v, OP_Rewind, iCur, addr+9); sqlite3VdbeAddOp3(v, OP_Column, iCur, 0, memId); sqlite3VdbeAddOp3(v, OP_Ne, memId-1, addr+7, memId); sqlite3VdbeChangeP5(v, SQLITE_JUMPIFNULL); sqlite3VdbeAddOp2(v, OP_Rowid, iCur, memId+1); sqlite3VdbeAddOp3(v, OP_Column, iCur, 1, memId); sqlite3VdbeAddOp2(v, OP_Goto, 0, addr+9); sqlite3VdbeAddOp2(v, OP_Next, iCur, addr+2); sqlite3VdbeAddOp2(v, OP_Integer, 0, memId); sqlite3VdbeAddOp2(v, OP_Close, iCur, 0); } return memId; } /* ** Update the maximum rowid for an autoincrement calculation. ** ** This routine should be called when the top of the stack holds a ** new rowid that is about to be inserted. If that new rowid is ** larger than the maximum rowid in the memId memory cell, then the ................................................................................ static void autoIncStep(Parse *pParse, int memId, int regRowid){ if( memId>0 ){ sqlite3VdbeAddOp2(pParse->pVdbe, OP_MemMax, memId, regRowid); } } /* ** After doing one or more inserts, the maximum rowid is stored ** in reg[memId]. Generate code to write this value back into the ** the sqlite_sequence table. */ static void autoIncEnd( Parse *pParse, /* The parsing context */ int iDb, /* Index of the database holding pTab */ Table *pTab, /* Table we are inserting into */ int memId /* Memory cell holding the maximum rowid */ ){ if( pTab->tabFlags & TF_Autoincrement ){ int iCur = pParse->nTab++; Vdbe *v = pParse->pVdbe; Db *pDb = &pParse->db->aDb[iDb]; int j1; int iRec = ++pParse->nMem; /* Memory cell used for record */ assert( v ); sqlite3OpenTable(pParse, iCur, iDb, pDb->pSchema->pSeqTab, OP_OpenWrite); j1 = sqlite3VdbeAddOp1(v, OP_NotNull, memId+1); sqlite3VdbeAddOp2(v, OP_NewRowid, iCur, memId+1); sqlite3VdbeJumpHere(v, j1); sqlite3VdbeAddOp3(v, OP_MakeRecord, memId-1, 2, iRec); sqlite3VdbeAddOp3(v, OP_Insert, iCur, iRec, memId+1); sqlite3VdbeChangeP5(v, OPFLAG_APPEND); sqlite3VdbeAddOp1(v, OP_Close, iCur); } } #else /* ** If SQLITE_OMIT_AUTOINCREMENT is defined, then the three routines ** above are all no-ops */ # define autoIncBegin(A,B,C) (0) # define autoIncStep(A,B,C) # define autoIncEnd(A,B,C,D) #endif /* SQLITE_OMIT_AUTOINCREMENT */ /* Forward declaration */ static int xferOptimization( Parse *pParse, /* Parser context */ Table *pDest, /* The table we are inserting into */ ................................................................................ ** very fast and which reduce fragmentation of indices. ** ** This is the 2nd template. */ if( pColumn==0 && xferOptimization(pParse, pTab, pSelect, onError, iDb) ){ assert( !pTrigger ); assert( pList==0 ); goto insert_cleanup; } #endif /* SQLITE_OMIT_XFER_OPT */ /* If this is an AUTOINCREMENT table, look up the sequence number in the ** sqlite_sequence table and store it in memory cell regAutoinc. */ regAutoinc = autoIncBegin(pParse, iDb, pTab); ................................................................................ /* Close all tables opened */ sqlite3VdbeAddOp1(v, OP_Close, baseCur); for(idx=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){ sqlite3VdbeAddOp1(v, OP_Close, idx+baseCur); } } /* Update the sqlite_sequence table by storing the content of the ** counter value in memory regAutoinc back into the sqlite_sequence ** table. */ autoIncEnd(pParse, iDb, pTab, regAutoinc); /* ** Return the number of rows inserted. If this routine is ** generating code because of a call to sqlite3NestedParse(), do not ** invoke the callback function. */ if( db->flags & SQLITE_CountRows && pParse->nested==0 && !pParse->trigStack ){ ................................................................................ assert( (pDest->tabFlags & TF_Autoincrement)==0 ); } sqlite3VdbeAddOp2(v, OP_RowData, iSrc, regData); sqlite3VdbeAddOp3(v, OP_Insert, iDest, regData, regRowid); sqlite3VdbeChangeP5(v, OPFLAG_NCHANGE|OPFLAG_LASTROWID|OPFLAG_APPEND); sqlite3VdbeChangeP4(v, -1, pDest->zName, 0); sqlite3VdbeAddOp2(v, OP_Next, iSrc, addr1); autoIncEnd(pParse, iDbDest, pDest, regAutoinc); for(pDestIdx=pDest->pIndex; pDestIdx; pDestIdx=pDestIdx->pNext){ for(pSrcIdx=pSrc->pIndex; ALWAYS(pSrcIdx); pSrcIdx=pSrcIdx->pNext){ if( xferCompatibleIndex(pDestIdx, pSrcIdx) ) break; } assert( pSrcIdx ); sqlite3VdbeAddOp2(v, OP_Close, iSrc, 0); sqlite3VdbeAddOp2(v, OP_Close, iDest, 0); ................................................................................ ** ************************************************************************* ** Main file for the SQLite library. The routines in this file ** implement the programmer interface to the library. Routines in ** other files are for internal use by SQLite and should not be ** accessed by users of the library. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Execute SQL code. Return one of the SQLITE_ success/failure ** codes. Also write an error message into memory obtained from ** malloc() and make *pzErrMsg point to that message. ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains code used to dynamically load extensions into ** the SQLite library. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef SQLITE_CORE #define SQLITE_CORE 1 /* Disable the API redefinition in sqlite3ext.h */ #endif /************** Include sqlite3ext.h in the middle of loadext.c **************/ /************** Begin file sqlite3ext.h **************************************/ ................................................................................ ************************************************************************* ** This header file defines the SQLite interface for use by ** shared libraries that want to be imported as extensions into ** an SQLite instance. Shared libraries that intend to be loaded ** as extensions by SQLite should #include this file instead of ** sqlite3.h. ** ** @(#) $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef _SQLITE3EXT_H_ #define _SQLITE3EXT_H_ typedef struct sqlite3_api_routines sqlite3_api_routines; /* ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains code used to implement the PRAGMA command. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* Ignore this whole file if pragmas are disabled */ #if !defined(SQLITE_OMIT_PRAGMA) && !defined(SQLITE_OMIT_PARSER) /* ** Interpret the given string as a safety level. Return 0 for OFF, ** 1 for ON or NORMAL and 2 for FULL. Return 1 for an empty or ** unrecognized string argument. ** ** Note that the values returned are one less that the values that ................................................................................ sqlite3VdbeAddOp4(v, OP_String8, 0, 2, 0, zState, P4_STATIC); sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 2); } }else #endif #ifdef SQLITE_SSE /* ** Check to see if the sqlite_statements table exists. Create it ** if it does not. */ if( sqlite3StrICmp(zLeft, "create_sqlite_statement_table")==0 ){ extern int sqlite3CreateStatementsTable(Parse*); sqlite3CreateStatementsTable(pParse); }else #endif #if SQLITE_HAS_CODEC if( sqlite3StrICmp(zLeft, "key")==0 && zRight ){ sqlite3_key(db, zRight, sqlite3Strlen30(zRight)); }else if( sqlite3StrICmp(zLeft, "rekey")==0 && zRight ){ sqlite3_rekey(db, zRight, sqlite3Strlen30(zRight)); }else ................................................................................ } #endif pragma_out: sqlite3DbFree(db, zLeft); sqlite3DbFree(db, zRight); } #endif /* SQLITE_OMIT_PRAGMA || SQLITE_OMIT_PARSER */ /************** End of pragma.c **********************************************/ /************** Begin file prepare.c *****************************************/ /* ** 2005 May 25 ** ** The author disclaims copyright to this source code. In place of ................................................................................ ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains the implementation of the sqlite3_prepare() ** interface, and routines that contribute to loading the database schema ** from disk. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Fill the InitData structure with an error message that indicates ** that the database is corrupt. */ static void corruptSchema( ................................................................................ const char *zExtra /* Error information */ ){ sqlite3 *db = pData->db; if( !db->mallocFailed && (db->flags & SQLITE_RecoveryMode)==0 ){ if( zObj==0 ) zObj = "?"; sqlite3SetString(pData->pzErrMsg, pData->db, "malformed database schema (%s)", zObj); if( zExtra && zExtra[0] ){ *pData->pzErrMsg = sqlite3MAppendf(pData->db, *pData->pzErrMsg, "%s - %s", *pData->pzErrMsg, zExtra); } } pData->rc = SQLITE_CORRUPT; } /* ** This is the callback routine for the code that initializes the ** database. See sqlite3Init() below for additional information. ** This routine is also called from the OP_ParseSchema opcode of the VDBE. ** ................................................................................ assert( argc==3 ); UNUSED_PARAMETER2(NotUsed, argc); assert( sqlite3_mutex_held(db->mutex) ); DbClearProperty(db, iDb, DB_Empty); if( db->mallocFailed ){ corruptSchema(pData, argv[0], 0); return SQLITE_NOMEM; } assert( iDb>=0 && iDb<db->nDb ); if( argv==0 ) return 0; /* Might happen if EMPTY_RESULT_CALLBACKS are on */ if( argv[1]==0 ){ corruptSchema(pData, argv[0], 0); }else if( argv[2] && argv[2][0] ){ ................................................................................ rc = sqlite3_exec(db, argv[2], 0, 0, &zErr); db->init.iDb = 0; assert( rc!=SQLITE_OK || zErr==0 ); if( SQLITE_OK!=rc ){ pData->rc = rc; if( rc==SQLITE_NOMEM ){ db->mallocFailed = 1; }else if( rc!=SQLITE_INTERRUPT && (rc&0xff)!=SQLITE_LOCKED ){ corruptSchema(pData, argv[0], zErr); } sqlite3DbFree(db, zErr); } }else if( argv[0]==0 ){ corruptSchema(pData, 0, 0); }else{ ................................................................................ ** was created to be the PRIMARY KEY or to fulfill a UNIQUE ** constraint for a CREATE TABLE. The index should have already ** been created when we processed the CREATE TABLE. All we have ** to do here is record the root page number for that index. */ Index *pIndex; pIndex = sqlite3FindIndex(db, argv[0], db->aDb[iDb].zName); if( pIndex==0 || pIndex->tnum!=0 ){ /* This can occur if there exists an index on a TEMP table which ** has the same name as another index on a permanent index. Since ** the permanent table is hidden by the TEMP table, we can also ** safely ignore the index on the permanent table. */ /* Do Nothing */; }else{ pIndex->tnum = atoi(argv[1]); } } return 0; } /* ** Attempt to read the database schema and initialize internal ................................................................................ sqlite3InitCallback(&initData, 3, (char **)azArg, 0); (void)sqlite3SafetyOn(db); if( initData.rc ){ rc = initData.rc; goto error_out; } pTab = sqlite3FindTable(db, zMasterName, db->aDb[iDb].zName); if( pTab ){ pTab->tabFlags |= TF_Readonly; } /* Create a cursor to hold the database open */ pDb = &db->aDb[iDb]; if( pDb->pBt==0 ){ if( !OMIT_TEMPDB && iDb==1 ){ DbSetProperty(db, 1, DB_SchemaLoaded); } return SQLITE_OK; } curMain = sqlite3MallocZero(sqlite3BtreeCursorSize()); if( !curMain ){ rc = SQLITE_NOMEM; ................................................................................ /* Get the database meta information. ** ** Meta values are as follows: ** meta[0] Schema cookie. Changes with each schema change. ** meta[1] File format of schema layer. ** meta[2] Size of the page cache. ** meta[3] Use freelist if 0. Autovacuum if greater than zero. ** meta[4] Db text encoding. 1:UTF-8 2:UTF-16LE 3:UTF-16BE ** ** Note: The #defined SQLITE_UTF* symbols in sqliteInt.h correspond to ** the possible values of meta[4]. */ for(i=0; rc==SQLITE_OK && i<ArraySize(meta); i++){ rc = sqlite3BtreeGetMeta(pDb->pBt, i+1, (u32 *)&meta[i]); } ................................................................................ if( iDb==0 && meta[BTREE_FILE_FORMAT-1]>=4 ){ db->flags &= ~SQLITE_LegacyFileFmt; } /* Read the schema information out of the schema tables */ assert( db->init.busy ); if( rc==SQLITE_EMPTY ){ /* For an empty database, there is nothing to read */ rc = SQLITE_OK; }else{ char *zSql; zSql = sqlite3MPrintf(db, "SELECT name, rootpage, sql FROM '%q'.%s", db->aDb[iDb].zName, zMasterName); (void)sqlite3SafetyOff(db); #ifndef SQLITE_OMIT_AUTHORIZATION { ................................................................................ ** file was of zero-length, then the DB_Empty flag is also set. */ SQLITE_PRIVATE int sqlite3Init(sqlite3 *db, char **pzErrMsg){ int i, rc; int commit_internal = !(db->flags&SQLITE_InternChanges); assert( sqlite3_mutex_held(db->mutex) ); if( db->init.busy ) return SQLITE_OK; rc = SQLITE_OK; db->init.busy = 1; for(i=0; rc==SQLITE_OK && i<db->nDb; i++){ if( DbHasProperty(db, i, DB_SchemaLoaded) || i==1 ) continue; rc = sqlite3InitOne(db, i, pzErrMsg); if( rc ){ sqlite3ResetInternalSchema(db, i); ................................................................................ } /* Once all the other databases have been initialised, load the schema ** for the TEMP database. This is loaded last, as the TEMP database ** schema may contain references to objects in other databases. */ #ifndef SQLITE_OMIT_TEMPDB if( rc==SQLITE_OK && db->nDb>1 && !DbHasProperty(db, 1, DB_SchemaLoaded) ){ rc = sqlite3InitOne(db, 1, pzErrMsg); if( rc ){ sqlite3ResetInternalSchema(db, 1); } } #endif ................................................................................ Btree *pBt; pBt = db->aDb[iDb].pBt; if( pBt==0 ) continue; memset(curTemp, 0, sqlite3BtreeCursorSize()); rc = sqlite3BtreeCursor(pBt, MASTER_ROOT, 0, 0, curTemp); if( rc==SQLITE_OK ){ rc = sqlite3BtreeGetMeta(pBt, BTREE_SCHEMA_VERSION, (u32 *)&cookie); if( rc==SQLITE_OK && cookie!=db->aDb[iDb].pSchema->schema_cookie ){ allOk = 0; } sqlite3BtreeCloseCursor(curTemp); } if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){ db->mallocFailed = 1; } } sqlite3_free(curTemp); }else{ allOk = 0; db->mallocFailed = 1; ................................................................................ } pParse->db = db; if( nBytes>=0 && (nBytes==0 || zSql[nBytes-1]!=0) ){ char *zSqlCopy; int mxLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH]; if( nBytes>mxLen ){ sqlite3Error(db, SQLITE_TOOBIG, "statement too long"); (void)sqlite3SafetyOff(db); rc = sqlite3ApiExit(db, SQLITE_TOOBIG); goto end_prepare; } zSqlCopy = sqlite3DbStrNDup(db, zSql, nBytes); ................................................................................ *ppStmt = 0; if( !sqlite3SafetyCheckOk(db) ){ return SQLITE_MISUSE; } sqlite3_mutex_enter(db->mutex); sqlite3BtreeEnterAll(db); rc = sqlite3Prepare(db, zSql, nBytes, saveSqlFlag, ppStmt, pzTail); sqlite3BtreeLeaveAll(db); sqlite3_mutex_leave(db->mutex); return rc; } /* ** Rerun the compilation of a statement after a schema change. ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle SELECT statements in SQLite. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Delete all the content of a Select structure but do not deallocate ** the select structure itself. */ ................................................................................ ** This file contains the sqlite3_get_table() and sqlite3_free_table() ** interface routines. These are just wrappers around the main ** interface routine of sqlite3_exec(). ** ** These routines are in a separate files so that they will not be linked ** if they are not used. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef SQLITE_OMIT_GET_TABLE /* ** This structure is used to pass data from sqlite3_get_table() through ** to the callback function is uses to build the result. ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef SQLITE_OMIT_TRIGGER /* ** Delete a linked list of TriggerStep structures. */ SQLITE_PRIVATE void sqlite3DeleteTriggerStep(sqlite3 *db, TriggerStep *pTriggerStep){ ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle UPDATE statements. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef SQLITE_OMIT_VIRTUALTABLE /* Forward declaration */ static void updateVirtualTable( Parse *pParse, /* The parsing context */ SrcList *pSrc, /* The virtual table to be modified */ ................................................................................ } } sqlite3VdbeAddOp2(v, OP_Close, iCur, 0); if( pTrigger ){ sqlite3VdbeAddOp2(v, OP_Close, newIdx, 0); sqlite3VdbeAddOp2(v, OP_Close, oldIdx, 0); } /* ** Return the number of rows that were changed. If this routine is ** generating code because of a call to sqlite3NestedParse(), do not ** invoke the callback function. */ if( db->flags & SQLITE_CountRows && !pParse->trigStack && pParse->nested==0 ){ ................................................................................ */ sqlite3SelectDestInit(&dest, SRT_Table, ephemTab); sqlite3Select(pParse, pSelect, &dest); /* Generate code to scan the ephemeral table and call VUpdate. */ iReg = ++pParse->nMem; pParse->nMem += pTab->nCol+1; sqlite3VdbeAddOp2(v, OP_Rewind, ephemTab, 0); addr = sqlite3VdbeCurrentAddr(v); sqlite3VdbeAddOp3(v, OP_Column, ephemTab, 0, iReg); sqlite3VdbeAddOp3(v, OP_Column, ephemTab, (pRowid?1:0), iReg+1); for(i=0; i<pTab->nCol; i++){ sqlite3VdbeAddOp3(v, OP_Column, ephemTab, i+1+(pRowid!=0), iReg+2+i); } sqlite3VtabMakeWritable(pParse, pTab); sqlite3VdbeAddOp4(v, OP_VUpdate, 0, pTab->nCol+2, iReg, pVtab, P4_VTAB); sqlite3VdbeAddOp2(v, OP_Next, ephemTab, addr); sqlite3VdbeJumpHere(v, addr-1); sqlite3VdbeAddOp2(v, OP_Close, ephemTab, 0); /* Cleanup */ sqlite3SelectDelete(db, pSelect); } #endif /* SQLITE_OMIT_VIRTUALTABLE */ ................................................................................ ** ************************************************************************* ** This file contains code used to implement the VACUUM command. ** ** Most of the code in this file may be omitted by defining the ** SQLITE_OMIT_VACUUM macro. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #if !defined(SQLITE_OMIT_VACUUM) && !defined(SQLITE_OMIT_ATTACH) /* ** Execute zSql on database db. Return an error code. */ static int execSql(sqlite3 *db, const char *zSql){ ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains code used to help implement virtual tables. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef SQLITE_OMIT_VIRTUALTABLE /* ** The actual function that does the work of creating a new module. ** This function implements the sqlite3_create_module() and ** sqlite3_create_module_v2() interfaces. ................................................................................ } /* ** Unlock a virtual table. When the last lock is removed, ** disconnect the virtual table. */ SQLITE_PRIVATE void sqlite3VtabUnlock(sqlite3 *db, sqlite3_vtab *pVtab){ assert( pVtab->nRef>0 ); pVtab->nRef--; assert(db); assert( sqlite3SafetyCheckOk(db) ); if( pVtab->nRef==0 ){ #ifdef SQLITE_DEBUG if( db->magic==SQLITE_MAGIC_BUSY ){ ................................................................................ ** This module contains C code that generates VDBE code used to process ** the WHERE clause of SQL statements. This module is responsible for ** generating the code that loops through a table looking for applicable ** rows. Indices are selected and used to speed the search when doing ** so is applicable. Because this module is responsible for selecting ** indices, you might also think of this module as the "query optimizer". ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** Trace output macros */ #if defined(SQLITE_TEST) || defined(SQLITE_DEBUG) SQLITE_PRIVATE int sqlite3WhereTrace = 0; ................................................................................ if( pColl==0 ) return 0; if( (pColl->type!=SQLITE_COLL_BINARY || *pnoCase) && (pColl->type!=SQLITE_COLL_NOCASE || !*pnoCase) ){ return 0; } if( sqlite3ExprAffinity(pLeft)!=SQLITE_AFF_TEXT ) return 0; z = pRight->u.zToken; cnt = 0; if( ALWAYS(z) ){ while( (c=z[cnt])!=0 && c!=wc[0] && c!=wc[1] && c!=wc[2] ){ cnt++; } } if( cnt==0 || c==0 || 255==(u8)z[cnt-1] ){ return 0; } *pisComplete = z[cnt]==wc[0] && z[cnt+1]==0; *pnPattern = cnt; return 1; } #endif /* SQLITE_OMIT_LIKE_OPTIMIZATION */ #ifndef SQLITE_OMIT_VIRTUALTABLE /* ** Check to see if the given expression is of the form ................................................................................ Parse *pParse, /* The parsing context */ WhereClause *pWC, /* The WHERE clause */ struct SrcList_item *pSrc, /* The FROM clause term to search */ Bitmask notReady, /* Mask of cursors that are not available */ ExprList *pOrderBy, /* The ORDER BY clause */ WhereCost *pCost /* Lowest cost query plan */ ){ if( IsVirtual(pSrc->pTab) ){ sqlite3_index_info *p = 0; bestVirtualIndex(pParse, pWC, pSrc, notReady, pOrderBy, pCost, &p); if( p->needToFreeIdxStr ){ sqlite3_free(p->idxStr); } sqlite3DbFree(pParse->db, p); }else{ bestBtreeIndex(pParse, pWC, pSrc, notReady, pOrderBy, pCost); } } /* ** Disable a term in the WHERE clause. Except, do not disable the term ** if it controls a LEFT OUTER JOIN and it did not originate in the ON ................................................................................ ** */ WhereClause *pOrWc; /* The OR-clause broken out into subterms */ WhereTerm *pFinal; /* Final subterm within the OR-clause. */ SrcList oneTab; /* Shortened table list */ int regReturn = ++pParse->nMem; /* Register used with OP_Gosub */ int regRowset; /* Register for RowSet object */ int regRowid; /* Register holding rowid */ int iLoopBody = sqlite3VdbeMakeLabel(v); /* Start of loop body */ int iRetInit; /* Address of regReturn init */ int ii; pTerm = pLevel->plan.u.pTerm; assert( pTerm!=0 ); assert( pTerm->eOperator==WO_OR ); ................................................................................ WHERE_OMIT_OPEN | WHERE_OMIT_CLOSE | WHERE_FORCE_TABLE); if( pSubWInfo ){ if( (wctrlFlags & WHERE_DUPLICATES_OK)==0 ){ int iSet = ((ii==pOrWc->nTerm-1)?-1:ii); int r; r = sqlite3ExprCodeGetColumn(pParse, pTabItem->pTab, -1, iCur, regRowid, 0); sqlite3VdbeAddOp4(v, OP_RowSetTest, regRowset, sqlite3VdbeCurrentAddr(v)+2, r, SQLITE_INT_TO_PTR(iSet), P4_INT32); } sqlite3VdbeAddOp2(v, OP_Gosub, regReturn, iLoopBody); /* Finish the loop through table entries that match term pOrTerm. */ sqlite3WhereEnd(pSubWInfo); ................................................................................ ** to virtual table cursors are set. This is used to selectively disable ** the OR-to-IN transformation in exprAnalyzeOrTerm(). It is not helpful ** with virtual tables. */ assert( pWC->vmask==0 && pMaskSet->n==0 ); for(i=0; i<pTabList->nSrc; i++){ createMask(pMaskSet, pTabList->a[i].iCursor); if( ALWAYS(pTabList->a[i].pTab) && IsVirtual(pTabList->a[i].pTab) ){ pWC->vmask |= ((Bitmask)1 << i); } } #ifndef NDEBUG { Bitmask toTheLeft = 0; for(i=0; i<pTabList->nSrc; i++){ Bitmask m = getMask(pMaskSet, pTabList->a[i].iCursor); assert( (m-1)==toTheLeft ); ................................................................................ ************************************************************************* ** An tokenizer for SQL ** ** This file contains C code that splits an SQL input string up into ** individual tokens and sends those tokens one-by-one over to the ** parser for analysis. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* ** The charMap() macro maps alphabetic characters into their ** lower-case ASCII equivalent. On ASCII machines, this is just ** an upper-to-lower case map. On EBCDIC machines we also need ** to adjust the encoding. Only alphabetic characters and underscores ................................................................................ */ /************** Include keywordhash.h in the middle of tokenize.c ************/ /************** Begin file keywordhash.h *************************************/ /***** This file contains automatically generated code ****** ** ** The code in this file has been automatically generated by ** ** $Header: /cvsroot/sqlite-dotnet2/SQLite.NET/SQLite.Interop/src/sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ ** ** The code in this file implements a function that determines whether ** or not a given identifier is really an SQL keyword. The same thing ** might be implemented more directly using a hand-written hash table. ** But by using this automatically generated code, the size of the code ** is substantially reduced. This is important for embedded applications ** on platforms with limited memory. ................................................................................ */ sqlite3DeleteTable(pParse->pNewTable); } sqlite3DeleteTrigger(db, pParse->pNewTrigger); sqlite3DbFree(db, pParse->apVarExpr); sqlite3DbFree(db, pParse->aAlias); while( pParse->pZombieTab ){ Table *p = pParse->pZombieTab; pParse->pZombieTab = p->pNextZombie; sqlite3DeleteTable(p); } if( nErr>0 && (pParse->rc==SQLITE_OK || pParse->rc==SQLITE_DONE) ){ pParse->rc = SQLITE_ERROR; } return nErr; } /************** End of tokenize.c ********************************************/ /************** Begin file complete.c ****************************************/ ................................................................................ ** An tokenizer for SQL ** ** This file contains C code that implements the sqlite3_complete() API. ** This code used to be part of the tokenizer.c source file. But by ** separating it out, the code will be automatically omitted from ** static links that do not use it. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifndef SQLITE_OMIT_COMPLETE /* ** This is defined in tokenize.c. We just have to import the definition. */ #ifndef SQLITE_AMALGAMATION ................................................................................ ** ************************************************************************* ** Main file for the SQLite library. The routines in this file ** implement the programmer interface to the library. Routines in ** other files are for internal use by SQLite and should not be ** accessed by users of the library. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #ifdef SQLITE_ENABLE_FTS3 /************** Include fts3.h in the middle of main.c ***********************/ /************** Begin file fts3.h ********************************************/ /* ** 2006 Oct 10 ................................................................................ return SQLITE_OK; } if( !sqlite3SafetyCheckSickOrOk(db) ){ return SQLITE_MISUSE; } sqlite3_mutex_enter(db->mutex); #ifdef SQLITE_SSE { extern void sqlite3SseCleanup(sqlite3*); sqlite3SseCleanup(db); } #endif sqlite3ResetInternalSchema(db, 0); /* If a transaction is open, the ResetInternalSchema() call above ** will not have called the xDisconnect() method on any virtual ** tables in the db->aVTrans[] array. The following sqlite3VtabRollback() ** call will do so. We need to do this before the check for active ** SQL statements below, as the v-table implementation may be storing ................................................................................ /* SQLITE_CORRUPT */ "database disk image is malformed", /* SQLITE_NOTFOUND */ 0, /* SQLITE_FULL */ "database or disk is full", /* SQLITE_CANTOPEN */ "unable to open database file", /* SQLITE_PROTOCOL */ 0, /* SQLITE_EMPTY */ "table contains no data", /* SQLITE_SCHEMA */ "database schema has changed", /* SQLITE_TOOBIG */ "String or BLOB exceeded size limit", /* SQLITE_CONSTRAINT */ "constraint failed", /* SQLITE_MISMATCH */ "datatype mismatch", /* SQLITE_MISUSE */ "library routine called out of sequence", /* SQLITE_NOLFS */ "large file support is disabled", /* SQLITE_AUTH */ "authorization denied", /* SQLITE_FORMAT */ "auxiliary database format error", /* SQLITE_RANGE */ "bind or column index out of range", ................................................................................ sqlite3_free(db); db = 0; goto opendb_out; } } sqlite3_mutex_enter(db->mutex); db->errMask = 0xff; db->priorNewRowid = 0; db->nDb = 2; db->magic = SQLITE_MAGIC_BUSY; db->aDb = db->aDbStatic; assert( sizeof(db->aLimit)==sizeof(aHardLimit) ); memcpy(db->aLimit, aHardLimit, sizeof(db->aLimit)); db->autoCommit = 1; ................................................................................ ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file contains the implementation of the sqlite3_unlock_notify() ** API method and its associated functionality. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ /* Omit this entire file if SQLITE_ENABLE_UNLOCK_NOTIFY is not defined. */ #ifdef SQLITE_ENABLE_UNLOCK_NOTIFY /* ** Public interfaces: ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains code for implementations of the r-tree and r*-tree ** algorithms packaged as an SQLite virtual table module. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_RTREE) /* ** This file contains an implementation of a couple of different variants ** of the r-tree algorithm. See the README file for further details. The ................................................................................ ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ ** ** This file implements an integration between the ICU library ** ("International Components for Unicode", an open-source library ** for handling unicode data) and SQLite. The integration uses ** ICU to provide the following to SQLite: ** ** * An implementation of the SQL regexp() function (and hence REGEXP ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file implements a tokenizer for fts3 based on the ICU library. ** ** $Id: sqlite3.c,v 1.14 2009/06/19 21:04:12 rmsimpson Exp $ */ #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) #ifdef SQLITE_ENABLE_ICU #include <unicode/ubrk.h> |
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 .. 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 .. 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 ... 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 ... 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 ... 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 .... 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 .... 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 .... 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 .... 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167 6168 6169 .... 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 .... 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700 6701 6702 6703 6704 .... 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761 6762 6763 6764 .... 7003 7004 7005 7006 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 .... 7395 7396 7397 7398 7399 7400 7401 7402 7403 7404 7405 7406 7407 7408 7409 .... 7475 7476 7477 7478 7479 7480 7481 7482 7483 7484 7485 7486 7487 7488 7489 .... 7523 7524 7525 7526 7527 7528 7529 7530 7531 7532 7533 7534 7535 7536 .... 7558 7559 7560 7561 7562 7563 7564 7565 7566 7567 7568 7569 7570 7571 7572 .... 7726 7727 7728 7729 7730 7731 7732 7733 7734 7735 7736 7737 7738 7739 7740 .... 8001 8002 8003 8004 8005 8006 8007 8008 8009 8010 8011 8012 8013 8014 8015 .... 8071 8072 8073 8074 8075 8076 8077 8078 8079 8080 8081 8082 8083 8084 .... 8216 8217 8218 8219 8220 8221 8222 8223 8224 8225 8226 8227 8228 8229 .... 8273 8274 8275 8276 8277 8278 8279 8280 8281 8282 8283 8284 8285 8286 .... 9351 9352 9353 9354 9355 9356 9357 9358 9359 9360 9361 9362 9363 9364 9365 9366 9367 9368 9369 9370 9371 9372 9373 9374 9375 9376 9377 9378 9379 9380 .... 9433 9434 9435 9436 9437 9438 9439 9440 9441 9442 9443 9444 9445 9446 9447 .... 9924 9925 9926 9927 9928 9929 9930 9931 9932 9933 9934 9935 9936 9937 9938 9939 9940 9941 9942 9943 9944 ..... 10336 10337 10338 10339 10340 10341 10342 10343 10344 10345 10346 10347 10348 10349 ..... 10372 10373 10374 10375 10376 10377 10378 10379 10380 10381 10382 10383 10384 10385 10386 ..... 10565 10566 10567 10568 10569 10570 10571 10572 10573 10574 10575 10576 10577 10578 10579 ..... 10692 10693 10694 10695 10696 10697 10698 10699 10700 10701 10702 10703 10704 10705 10706 ..... 11797 11798 11799 11800 11801 11802 11803 11804 11805 11806 11807 11808 11809 11810 11811 ..... 12077 12078 12079 12080 12081 12082 12083 12084 12085 12086 12087 12088 12089 12090 12091 ..... 12176 12177 12178 12179 12180 12181 12182 12183 12184 12185 12186 12187 12188 12189 12190 ..... 12240 12241 12242 12243 12244 12245 12246 12247 12248 12249 12250 12251 12252 12253 12254 ..... 12389 12390 12391 12392 12393 12394 12395 12396 12397 12398 12399 12400 12401 12402 12403 ..... 12838 12839 12840 12841 12842 12843 12844 12845 12846 12847 12848 12849 12850 12851 12852 ..... 13528 13529 13530 13531 13532 13533 13534 13535 13536 13537 13538 13539 13540 13541 13542 ..... 14009 14010 14011 14012 14013 14014 14015 14016 14017 14018 14019 14020 14021 14022 14023 ..... 14171 14172 14173 14174 14175 14176 14177 14178 14179 14180 14181 14182 14183 14184 14185 ..... 14345 14346 14347 14348 14349 14350 14351 14352 14353 14354 14355 14356 14357 14358 14359 ..... 14620 14621 14622 14623 14624 14625 14626 14627 14628 14629 14630 14631 14632 14633 14634 ..... 14950 14951 14952 14953 14954 14955 14956 14957 14958 14959 14960 14961 14962 14963 14964 ..... 15233 15234 15235 15236 15237 15238 15239 15240 15241 15242 15243 15244 15245 15246 15247 ..... 15485 15486 15487 15488 15489 15490 15491 15492 15493 15494 15495 15496 15497 15498 15499 15500 15501 15502 15503 15504 ..... 15692 15693 15694 15695 15696 15697 15698 15699 15700 15701 15702 15703 15704 15705 15706 15707 15708 15709 15710 15711 15712 ..... 15945 15946 15947 15948 15949 15950 15951 15952 15953 15954 15955 15956 15957 15958 15959 ..... 16915 16916 16917 16918 16919 16920 16921 16922 16923 16924 16925 16926 16927 16928 16929 ..... 17061 17062 17063 17064 17065 17066 17067 17068 17069 17070 17071 17072 17073 17074 17075 ..... 17103 17104 17105 17106 17107 17108 17109 17110 17111 17112 17113 17114 17115 17116 17117 17118 17119 17120 ..... 17342 17343 17344 17345 17346 17347 17348 17349 17350 17351 17352 17353 17354 17355 17356 17357 17358 17359 17360 17361 17362 17363 17364 17365 17366 17367 17368 17369 17370 17371 17372 17373 17374 17375 17376 17377 17378 17379 17380 17381 17382 17383 17384 17385 17386 17387 17388 17389 17390 17391 17392 17393 17394 17395 17396 17397 17398 17399 17400 17401 17402 ..... 17417 17418 17419 17420 17421 17422 17423 17424 17425 17426 17427 17428 17429 17430 17431 ..... 17998 17999 18000 18001 18002 18003 18004 18005 18006 18007 18008 18009 18010 18011 18012 18013 18014 18015 18016 18017 18018 18019 18020 18021 18022 18023 18024 18025 ..... 18353 18354 18355 18356 18357 18358 18359 18360 18361 18362 18363 18364 18365 18366 18367 ..... 19036 19037 19038 19039 19040 19041 19042 19043 19044 19045 19046 19047 19048 19049 19050 ..... 19473 19474 19475 19476 19477 19478 19479 19480 19481 19482 19483 19484 19485 19486 19487 ..... 19536 19537 19538 19539 19540 19541 19542 19543 19544 19545 19546 19547 19548 19549 19550 ..... 19598 19599 19600 19601 19602 19603 19604 19605 19606 19607 19608 19609 19610 19611 19612 ..... 20856 20857 20858 20859 20860 20861 20862 20863 20864 20865 20866 20867 20868 20869 20870 ..... 21052 21053 21054 21055 21056 21057 21058 21059 21060 21061 21062 21063 21064 21065 21066 ..... 21114 21115 21116 21117 21118 21119 21120 21121 21122 21123 21124 21125 21126 21127 21128 ..... 21944 21945 21946 21947 21948 21949 21950 21951 21952 21953 21954 21955 21956 21957 21958 ..... 22848 22849 22850 22851 22852 22853 22854 22855 22856 22857 22858 22859 22860 22861 22862 22863 ..... 25099 25100 25101 25102 25103 25104 25105 25106 25107 25108 25109 25110 25111 25112 25113 25114 25115 25116 25117 ..... 26196 26197 26198 26199 26200 26201 26202 26203 26204 26205 26206 26207 26208 26209 26210 ..... 26264 26265 26266 26267 26268 26269 26270 26271 26272 26273 26274 26275 26276 26277 26278 ..... 26326 26327 26328 26329 26330 26331 26332 26333 26334 26335 26336 26337 26338 26339 26340 ..... 28321 28322 28323 28324 28325 28326 28327 28328 28329 28330 28331 28332 28333 28334 28335 ..... 28707 28708 28709 28710 28711 28712 28713 28714 28715 28716 28717 28718 28719 28720 28721 ..... 29296 29297 29298 29299 29300 29301 29302 29303 29304 29305 29306 29307 29308 29309 29310 ..... 30111 30112 30113 30114 30115 30116 30117 30118 30119 30120 30121 30122 30123 30124 30125 ..... 30495 30496 30497 30498 30499 30500 30501 30502 30503 30504 30505 30506 30507 30508 30509 ..... 30580 30581 30582 30583 30584 30585 30586 30587 30588 30589 30590 30591 30592 30593 30594 30595 30596 30597 ..... 30766 30767 30768 30769 30770 30771 30772 30773 30774 30775 30776 30777 30778 30779 30780 30781 ..... 30782 30783 30784 30785 30786 30787 30788 30789 30790 30791 30792 30793 30794 30795 30796 30797 30798 ..... 31233 31234 31235 31236 31237 31238 31239 31240 31241 31242 31243 31244 31245 31246 ..... 31258 31259 31260 31261 31262 31263 31264 31265 31266 31267 31268 31269 31270 31271 31272 31273 31274 31275 ..... 31329 31330 31331 31332 31333 31334 31335 31336 31337 31338 31339 31340 31341 31342 31343 ..... 31355 31356 31357 31358 31359 31360 31361 31362 31363 31364 31365 31366 31367 31368 31369 31370 31371 31372 31373 31374 31375 31376 ..... 31410 31411 31412 31413 31414 31415 31416 31417 31418 31419 31420 31421 31422 31423 31424 ..... 32012 32013 32014 32015 32016 32017 32018 32019 32020 32021 32022 32023 32024 32025 32026 32027 32028 32029 32030 ..... 32457 32458 32459 32460 32461 32462 32463 32464 32465 32466 32467 32468 32469 32470 32471 ..... 32677 32678 32679 32680 32681 32682 32683 32684 32685 32686 32687 32688 32689 32690 32691 ..... 32848 32849 32850 32851 32852 32853 32854 32855 32856 32857 32858 32859 32860 32861 32862 32863 32864 32865 32866 32867 32868 32869 32870 32871 32872 32873 32874 32875 32876 ..... 32893 32894 32895 32896 32897 32898 32899 32900 32901 32902 32903 32904 32905 32906 32907 ..... 32914 32915 32916 32917 32918 32919 32920 32921 32922 32923 32924 32925 32926 32927 32928 32929 32930 32931 ..... 33165 33166 33167 33168 33169 33170 33171 33172 33173 33174 33175 33176 33177 33178 33179 33180 33181 33182 ..... 33240 33241 33242 33243 33244 33245 33246 33247 33248 33249 33250 33251 33252 33253 ..... 33262 33263 33264 33265 33266 33267 33268 33269 33270 33271 33272 33273 33274 33275 33276 33277 33278 33279 33280 33281 33282 33283 ..... 33296 33297 33298 33299 33300 33301 33302 33303 33304 33305 33306 33307 33308 33309 33310 33311 33312 33313 ..... 33423 33424 33425 33426 33427 33428 33429 33430 33431 33432 33433 33434 33435 33436 33437 ..... 33793 33794 33795 33796 33797 33798 33799 33800 33801 33802 33803 33804 33805 33806 33807 ..... 33808 33809 33810 33811 33812 33813 33814 33815 33816 33817 33818 33819 33820 33821 33822 ..... 33844 33845 33846 33847 33848 33849 33850 33851 33852 33853 33854 33855 33856 33857 33858 ..... 34053 34054 34055 34056 34057 34058 34059 34060 34061 34062 34063 34064 34065 34066 34067 34068 34069 34070 34071 34072 34073 ..... 34142 34143 34144 34145 34146 34147 34148 34149 34150 34151 34152 34153 34154 34155 34156 34157 34158 34159 34160 34161 ..... 34166 34167 34168 34169 34170 34171 34172 34173 34174 34175 34176 34177 34178 34179 34180 34181 34182 34183 34184 34185 ..... 34351 34352 34353 34354 34355 34356 34357 34358 34359 34360 34361 34362 34363 34364 34365 ..... 35561 35562 35563 35564 35565 35566 35567 35568 35569 35570 35571 35572 35573 35574 35575 35576 35577 35578 35579 35580 35581 35582 35583 35584 35585 35586 35587 35588 35589 35590 35591 35592 ..... 35850 35851 35852 35853 35854 35855 35856 35857 35858 35859 35860 35861 35862 35863 35864 ..... 35870 35871 35872 35873 35874 35875 35876 35877 35878 35879 35880 35881 35882 35883 35884 ..... 35931 35932 35933 35934 35935 35936 35937 35938 35939 35940 35941 35942 35943 35944 35945 35946 35947 35948 35949 35950 35951 35952 35953 35954 35955 ..... 36336 36337 36338 36339 36340 36341 36342 36343 36344 36345 36346 36347 36348 36349 ..... 36504 36505 36506 36507 36508 36509 36510 36511 36512 36513 36514 36515 36516 36517 36518 36519 36520 36521 36522 36523 ..... 36861 36862 36863 36864 36865 36866 36867 36868 36869 36870 36871 36872 36873 36874 36875 ..... 37489 37490 37491 37492 37493 37494 37495 37496 37497 37498 37499 37500 37501 37502 ..... 37680 37681 37682 37683 37684 37685 37686 37687 37688 37689 37690 37691 37692 37693 37694 37695 37696 37697 37698 37699 ..... 37788 37789 37790 37791 37792 37793 37794 37795 37796 37797 37798 37799 37800 37801 ..... 37866 37867 37868 37869 37870 37871 37872 37873 37874 37875 37876 37877 37878 37879 37880 ..... 38029 38030 38031 38032 38033 38034 38035 38036 38037 38038 38039 38040 38041 38042 38043 ..... 38439 38440 38441 38442 38443 38444 38445 38446 38447 38448 38449 38450 38451 38452 38453 ..... 38730 38731 38732 38733 38734 38735 38736 38737 38738 38739 38740 38741 38742 38743 38744 38745 ..... 38886 38887 38888 38889 38890 38891 38892 38893 38894 38895 38896 38897 38898 38899 38900 38901 38902 38903 38904 38905 ..... 38965 38966 38967 38968 38969 38970 38971 38972 38973 38974 38975 38976 38977 38978 38979 38980 38981 38982 ..... 40047 40048 40049 40050 40051 40052 40053 40054 40055 40056 40057 40058 40059 40060 40061 ..... 40063 40064 40065 40066 40067 40068 40069 40070 40071 40072 40073 40074 40075 40076 40077 40078 40079 40080 40081 40082 40083 40084 40085 40086 40087 40088 40089 40090 40091 40092 ..... 41240 41241 41242 41243 41244 41245 41246 41247 41248 41249 41250 41251 41252 41253 41254 ..... 41318 41319 41320 41321 41322 41323 41324 41325 41326 41327 41328 41329 41330 41331 41332 ..... 41378 41379 41380 41381 41382 41383 41384 41385 41386 41387 41388 41389 41390 41391 41392 41393 41394 41395 41396 41397 41398 41399 41400 41401 41402 41403 ..... 41415 41416 41417 41418 41419 41420 41421 41422 41423 41424 41425 41426 41427 41428 41429 ..... 41905 41906 41907 41908 41909 41910 41911 41912 41913 41914 41915 41916 41917 41918 41919 41920 41921 41922 41923 41924 41925 41926 41927 41928 41929 41930 41931 41932 41933 41934 41935 41936 41937 41938 41939 41940 41941 41942 41943 41944 41945 ..... 41963 41964 41965 41966 41967 41968 41969 41970 41971 41972 41973 41974 41975 41976 41977 41978 41979 41980 41981 41982 41983 41984 41985 41986 41987 41988 41989 41990 41991 41992 41993 ..... 42069 42070 42071 42072 42073 42074 42075 42076 42077 42078 42079 42080 42081 42082 42083 ..... 42084 42085 42086 42087 42088 42089 42090 42091 42092 42093 42094 42095 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/****************************************************************************** ** This file is an amalgamation of many separate C source files from SQLite ** version 3.6.16. By combining all the individual C code files into this ** single large file, the entire code can be compiled as a one translation ** unit. This allows many compilers to do optimizations that would not be ** possible if the files were compiled separately. Performance improvements ** of 5% are more are commonly seen when SQLite is compiled as a single ** translation unit. ** ** This file is all you need to compile SQLite. To use SQLite in other ** programs, you need this file and the "sqlite3.h" header file that defines ** the programming interface to the SQLite library. (If you do not have ** the "sqlite3.h" header file at hand, you will find a copy in the first ** 5626 lines past this header comment.) Additional code files may be ** needed if you want a wrapper to interface SQLite with your choice of ** programming language. The code for the "sqlite3" command-line shell ** is also in a separate file. This file contains only code for the core ** SQLite library. ** ** This amalgamation was generated on 2009-06-27 14:10:06 UTC. */ #define SQLITE_CORE 1 #define SQLITE_AMALGAMATION 1 #ifndef SQLITE_PRIVATE # define SQLITE_PRIVATE static #endif #ifndef SQLITE_API ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** Internal interface definitions for SQLite. ** ** @(#) $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _SQLITEINT_H_ #define _SQLITEINT_H_ /* ** Include the configuration header output by 'configure' if we're using the ** autoconf-based build ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file defines various limits of what SQLite can process. ** ** @(#) $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** The maximum length of a TEXT or BLOB in bytes. This also ** limits the size of a row in a table or index. ** ** The hard limit is the ability of a 32-bit signed integer ................................................................................ ** be true and false so that the unreachable code then specify will ** not be counted as untested code. */ #if defined(SQLITE_COVERAGE_TEST) # define ALWAYS(X) (1) # define NEVER(X) (0) #elif !defined(NDEBUG) # define ALWAYS(X) ((X)?1:(assert(0),0)) # define NEVER(X) ((X)?(assert(0),1):0) #else # define ALWAYS(X) (X) # define NEVER(X) (X) #endif /* ** The macro unlikely() is a hint that surrounds a boolean ................................................................................ ** on how SQLite interfaces are suppose to operate. ** ** The name of this file under configuration management is "sqlite.h.in". ** The makefile makes some minor changes to this file (such as inserting ** the version number) and changes its name to "sqlite3.h" as ** part of the build process. ** ** @(#) $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _SQLITE3_H_ #define _SQLITE3_H_ #include <stdarg.h> /* Needed for the definition of va_list */ /* ** Make sure we can call this stuff from C++. ................................................................................ ** The Z value is the release number and is incremented with ** each release but resets back to 0 whenever Y is incremented. ** ** See also: [sqlite3_libversion()] and [sqlite3_libversion_number()]. ** ** Requirements: [H10011] [H10014] */ #define SQLITE_VERSION "3.6.16" #define SQLITE_VERSION_NUMBER 3006016 /* ** CAPI3REF: Run-Time Library Version Numbers {H10020} <S60100> ** KEYWORDS: sqlite3_version ** ** These features provide the same information as the [SQLITE_VERSION] ** and [SQLITE_VERSION_NUMBER] #defines in the header, but are associated ................................................................................ ** ** Every file opened by the [sqlite3_vfs] xOpen method populates an ** [sqlite3_file] object (or, more commonly, a subclass of the ** [sqlite3_file] object) with a pointer to an instance of this object. ** This object defines the methods used to perform various operations ** against the open file represented by the [sqlite3_file] object. ** ** If the xOpen method sets the sqlite3_file.pMethods element ** to a non-NULL pointer, then the sqlite3_io_methods.xClose method ** may be invoked even if the xOpen reported that it failed. The ** only way to prevent a call to xClose following a failed xOpen ** is for the xOpen to set the sqlite3_file.pMethods element to NULL. ** ** The flags argument to xSync may be one of [SQLITE_SYNC_NORMAL] or ** [SQLITE_SYNC_FULL]. The first choice is the normal fsync(). ** The second choice is a Mac OS X style fullsync. The [SQLITE_SYNC_DATAONLY] ** flag may be ORed in to indicate that only the data of the file ** and not its inode needs to be synced. ** ** The integer values to xLock() and xUnlock() are one of ................................................................................ ** The zName field holds the name of the VFS module. The name must ** be unique across all VFS modules. ** ** SQLite will guarantee that the zFilename parameter to xOpen ** is either a NULL pointer or string obtained ** from xFullPathname(). SQLite further guarantees that ** the string will be valid and unchanged until xClose() is ** called. Because of the previous sentence, ** the [sqlite3_file] can safely store a pointer to the ** filename if it needs to remember the filename for some reason. ** If the zFilename parameter is xOpen is a NULL pointer then xOpen ** must invent its own temporary name for the file. Whenever the ** xFilename parameter is NULL it will also be the case that the ** flags parameter will include [SQLITE_OPEN_DELETEONCLOSE]. ** ** The flags argument to xOpen() includes all bits set in ** the flags argument to [sqlite3_open_v2()]. Or if [sqlite3_open()] ** or [sqlite3_open16()] is used, then flags includes at least ** [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]. ................................................................................ ** be created, and that it is an error if it already exists. ** It is <i>not</i> used to indicate the file should be opened ** for exclusive access. ** ** At least szOsFile bytes of memory are allocated by SQLite ** to hold the [sqlite3_file] structure passed as the third ** argument to xOpen. The xOpen method does not have to ** allocate the structure; it should just fill it in. Note that ** the xOpen method must set the sqlite3_file.pMethods to either ** a valid [sqlite3_io_methods] object or to NULL. xOpen must do ** this even if the open fails. SQLite expects that the sqlite3_file.pMethods ** element will be valid after xOpen returns regardless of the success ** or failure of the xOpen call. ** ** The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS] ** to test for the existence of a file, or [SQLITE_ACCESS_READWRITE] to ** test whether a file is readable and writable, or [SQLITE_ACCESS_READ] ** to test whether a file is at least readable. The file can be a ** directory. ** ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This is the header file for the generic hash-table implemenation ** used in SQLite. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _SQLITE_HASH_H_ #define _SQLITE_HASH_H_ /* Forward declarations of structures. */ typedef struct Hash Hash; typedef struct HashElem HashElem; ................................................................................ ** If compiling for a processor that lacks floating point support, ** substitute integer for floating-point */ #ifdef SQLITE_OMIT_FLOATING_POINT # define double sqlite_int64 # define LONGDOUBLE_TYPE sqlite_int64 # ifndef SQLITE_BIG_DBL # define SQLITE_BIG_DBL (((sqlite3_int64)1)<<60) # endif # define SQLITE_OMIT_DATETIME_FUNCS 1 # define SQLITE_OMIT_TRACE 1 # undef SQLITE_MIXED_ENDIAN_64BIT_FLOAT # undef SQLITE_HAVE_ISNAN #endif #ifndef SQLITE_BIG_DBL # define SQLITE_BIG_DBL (1e99) #endif /* ** OMIT_TEMPDB is set to 1 if SQLITE_OMIT_TEMPDB is defined, or 0 ................................................................................ #define UNUSED_PARAMETER2(x,y) UNUSED_PARAMETER(x),UNUSED_PARAMETER(y) /* ** Forward references to structures */ typedef struct AggInfo AggInfo; typedef struct AuthContext AuthContext; typedef struct AutoincInfo AutoincInfo; typedef struct Bitvec Bitvec; typedef struct RowSet RowSet; typedef struct CollSeq CollSeq; typedef struct Column Column; typedef struct Db Db; typedef struct Schema Schema; typedef struct Expr Expr; ................................................................................ ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the sqlite B-Tree file ** subsystem. See comments in the source code for a detailed description ** of what each interface routine does. ** ** @(#) $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _BTREE_H_ #define _BTREE_H_ /* TODO: This definition is just included so other modules compile. It ** needs to be revisited. */ ................................................................................ ************************************************************************* ** Header file for the Virtual DataBase Engine (VDBE) ** ** This header defines the interface to the virtual database engine ** or VDBE. The VDBE implements an abstract machine that runs a ** simple program to access and modify the underlying database. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _SQLITE_VDBE_H_ #define _SQLITE_VDBE_H_ /* ** A single VDBE is an opaque structure named "Vdbe". Only routines ** in the source file sqliteVdbe.c are allowed to see the insides ................................................................................ ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the sqlite page cache ** subsystem. The page cache subsystem reads and writes a file a page ** at a time and provides a journal for rollback. ** ** @(#) $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _PAGER_H_ #define _PAGER_H_ /* ** Default maximum size for persistent journal files. A negative ................................................................................ SQLITE_PRIVATE int sqlite3PagerOpen(sqlite3_vfs *, Pager **ppPager, const char*, int,int,int); SQLITE_PRIVATE int sqlite3PagerClose(Pager *pPager); SQLITE_PRIVATE int sqlite3PagerReadFileheader(Pager*, int, unsigned char*); /* Functions used to configure a Pager object. */ SQLITE_PRIVATE void sqlite3PagerSetBusyhandler(Pager*, int(*)(void *), void *); SQLITE_PRIVATE void sqlite3PagerSetReiniter(Pager*, void(*)(DbPage*)); SQLITE_PRIVATE int sqlite3PagerSetPagesize(Pager*, u16*, int); SQLITE_PRIVATE int sqlite3PagerMaxPageCount(Pager*, int); SQLITE_PRIVATE void sqlite3PagerSetCachesize(Pager*, int); SQLITE_PRIVATE void sqlite3PagerSetSafetyLevel(Pager*,int,int); SQLITE_PRIVATE int sqlite3PagerLockingMode(Pager *, int); SQLITE_PRIVATE int sqlite3PagerJournalMode(Pager *, int); SQLITE_PRIVATE i64 sqlite3PagerJournalSizeLimit(Pager *, i64); SQLITE_PRIVATE sqlite3_backup **sqlite3PagerBackupPtr(Pager*); ................................................................................ SQLITE_PRIVATE int sqlite3PagerNosync(Pager*); SQLITE_PRIVATE void *sqlite3PagerTempSpace(Pager*); SQLITE_PRIVATE int sqlite3PagerIsMemdb(Pager*); /* Functions used to truncate the database file. */ SQLITE_PRIVATE void sqlite3PagerTruncateImage(Pager*,Pgno); /* Functions to support testing and debugging. */ #if !defined(NDEBUG) || defined(SQLITE_TEST) SQLITE_PRIVATE Pgno sqlite3PagerPagenumber(DbPage*); SQLITE_PRIVATE int sqlite3PagerIswriteable(DbPage*); #endif #ifdef SQLITE_TEST SQLITE_PRIVATE int *sqlite3PagerStats(Pager*); ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the sqlite page cache ** subsystem. ** ** @(#) $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _PCACHE_H_ typedef struct PgHdr PgHdr; typedef struct PCache PCache; ................................................................................ ** This header file (together with is companion C source-code file ** "os.c") attempt to abstract the underlying operating system so that ** the SQLite library will work on both POSIX and windows systems. ** ** This header file is #include-ed by sqliteInt.h and thus ends up ** being included by every source file. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _SQLITE_OS_H_ #define _SQLITE_OS_H_ /* ** Figure out if we are dealing with Unix, Windows, or some other ** operating system. After the following block of preprocess macros, ................................................................................ ** to all source files. We break it out in an effort to keep the code ** better organized. ** ** NOTE: source files should *not* #include this header file directly. ** Source files should #include the sqliteInt.h file and let that file ** include this one indirectly. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** Figure out what version of the code to use. The choices are ** ** SQLITE_MUTEX_OMIT No mutex logic. Not even stubs. The ................................................................................ */ struct Db { char *zName; /* Name of this database */ Btree *pBt; /* The B*Tree structure for this database file */ u8 inTrans; /* 0: not writable. 1: Transaction. 2: Checkpoint */ u8 safety_level; /* How aggressive at syncing data to disk */ Schema *pSchema; /* Pointer to database schema (possibly shared) */ }; /* ** An instance of the following structure stores a database schema. ** ** If there are no virtual tables configured in this schema, the ** Schema.db variable is set to NULL. After the first virtual table ................................................................................ u8 dfltLockMode; /* Default locking-mode for attached dbs */ u8 dfltJournalMode; /* Default journal mode for attached dbs */ signed char nextAutovac; /* Autovac setting after VACUUM if >=0 */ int nextPagesize; /* Pagesize after VACUUM if >0 */ int nTable; /* Number of tables in the database */ CollSeq *pDfltColl; /* The default collating sequence (BINARY) */ i64 lastRowid; /* ROWID of most recent insert (see above) */ u32 magic; /* Magic number for detect library misuse */ int nChange; /* Value returned by sqlite3_changes() */ int nTotalChange; /* Value returned by sqlite3_total_changes() */ sqlite3_mutex *mutex; /* Connection mutex */ int aLimit[SQLITE_N_LIMIT]; /* Limits */ struct sqlite3InitInfo { /* Information used during initialization */ int iDb; /* When back is being initialized */ ................................................................................ int nVTrans; /* Allocated size of aVTrans */ #endif FuncDefHash aFunc; /* Hash table of connection functions */ Hash aCollSeq; /* All collating sequences */ BusyHandler busyHandler; /* Busy callback */ int busyTimeout; /* Busy handler timeout, in msec */ Db aDbStatic[2]; /* Static space for the 2 default backends */ Savepoint *pSavepoint; /* List of active savepoints */ int nSavepoint; /* Number of non-transaction savepoints */ int nStatement; /* Number of nested statement-transactions */ u8 isTransactionSavepoint; /* True if the outermost savepoint is a TS */ #ifdef SQLITE_ENABLE_UNLOCK_NOTIFY /* The following variables are all protected by the STATIC_MASTER ................................................................................ u8 eDest; /* How to dispose of the results */ u8 affinity; /* Affinity used when eDest==SRT_Set */ int iParm; /* A parameter used by the eDest disposal method */ int iMem; /* Base register where results are written */ int nMem; /* Number of registers allocated */ }; /* ** During code generation of statements that do inserts into AUTOINCREMENT ** tables, the following information is attached to the Table.u.autoInc.p ** pointer of each autoincrement table to record some side information that ** the code generator needs. We have to keep per-table autoincrement ** information in case inserts are down within triggers. Triggers do not ** normally coordinate their activities, but we do need to coordinate the ** loading and saving of autoincrement information. */ struct AutoincInfo { AutoincInfo *pNext; /* Next info block in a list of them all */ Table *pTab; /* Table this info block refers to */ int iDb; /* Index in sqlite3.aDb[] of database holding pTab */ int regCtr; /* Memory register holding the rowid counter */ }; /* ** Size of the column cache */ #ifndef SQLITE_N_COLCACHE # define SQLITE_N_COLCACHE 10 #endif ................................................................................ int cookieValue[SQLITE_MAX_ATTACHED+2]; /* Values of cookies to verify */ #ifndef SQLITE_OMIT_SHARED_CACHE int nTableLock; /* Number of locks in aTableLock */ TableLock *aTableLock; /* Required table locks for shared-cache mode */ #endif int regRowid; /* Register holding rowid of CREATE TABLE entry */ int regRoot; /* Register holding root page number for new objects */ AutoincInfo *pAinc; /* Information about AUTOINCREMENT counters */ /* Above is constant between recursions. Below is reset before and after ** each recursion */ int nVar; /* Number of '?' variables seen in the SQL so far */ int nVarExpr; /* Number of used slots in apVarExpr[] */ int nVarExprAlloc; /* Number of allocated slots in apVarExpr[] */ ................................................................................ SQLITE_PRIVATE int sqlite3ViewGetColumnNames(Parse*,Table*); #else # define sqlite3ViewGetColumnNames(A,B) 0 #endif SQLITE_PRIVATE void sqlite3DropTable(Parse*, SrcList*, int, int); SQLITE_PRIVATE void sqlite3DeleteTable(Table*); #ifndef SQLITE_OMIT_AUTOINCREMENT SQLITE_PRIVATE void sqlite3AutoincrementBegin(Parse *pParse); SQLITE_PRIVATE void sqlite3AutoincrementEnd(Parse *pParse); #else # define sqlite3AutoincrementBegin(X) # define sqlite3AutoincrementEnd(X) #endif SQLITE_PRIVATE void sqlite3Insert(Parse*, SrcList*, ExprList*, Select*, IdList*, int); SQLITE_PRIVATE void *sqlite3ArrayAllocate(sqlite3*,void*,int,int,int*,int*,int*); SQLITE_PRIVATE IdList *sqlite3IdListAppend(sqlite3*, IdList*, Token*); SQLITE_PRIVATE int sqlite3IdListIndex(IdList*,const char*); SQLITE_PRIVATE SrcList *sqlite3SrcListEnlarge(sqlite3*, SrcList*, int, int); SQLITE_PRIVATE SrcList *sqlite3SrcListAppend(sqlite3*, SrcList*, Token*, Token*); SQLITE_PRIVATE SrcList *sqlite3SrcListAppendFromTerm(Parse*, SrcList*, Token*, Token*, ................................................................................ SQLITE_PRIVATE void sqlite3ConnectionClosed(sqlite3 *db); #else #define sqlite3ConnectionBlocked(x,y) #define sqlite3ConnectionUnlocked(x) #define sqlite3ConnectionClosed(x) #endif #ifdef SQLITE_DEBUG SQLITE_PRIVATE void sqlite3ParserTrace(FILE*, char *); #endif /* ** If the SQLITE_ENABLE IOTRACE exists then the global variable ** sqlite3IoTrace is a pointer to a printf-like routine used to ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file contains definitions of global variables and contants. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* An array to map all upper-case characters into their corresponding ** lower-case character. ** ** SQLite only considers US-ASCII (or EBCDIC) characters. We do not ................................................................................ ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This module implements the sqlite3_status() interface and related ** functionality. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** Variables in which to record status information. */ typedef struct sqlite3StatType sqlite3StatType; static SQLITE_WSD struct sqlite3StatType { ................................................................................ ** This file contains the C functions that implement date and time ** functions for SQLite. ** ** There is only one exported symbol in this file - the function ** sqlite3RegisterDateTimeFunctions() found at the bottom of the file. ** All other code has file scope. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ ** ** SQLite processes all times and dates as Julian Day numbers. The ** dates and times are stored as the number of days since noon ** in Greenwich on November 24, 4714 B.C. according to the Gregorian ** calendar system. ** ** 1970-01-01 00:00:00 is JD 2440587.5 ................................................................................ ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains OS interface code that is common to all ** architectures. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #define _SQLITE_OS_C_ 1 #undef _SQLITE_OS_C_ /* ** The default SQLite sqlite3_vfs implementations do not allocate ** memory (actually, os_unix.c allocates a small amount of memory ................................................................................ ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** This file contains code to support the concept of "benign" ** malloc failures (when the xMalloc() or xRealloc() method of the ** sqlite3_mem_methods structure fails to allocate a block of memory ** and returns 0). ................................................................................ ** ** This file contains a no-op memory allocation drivers for use when ** SQLITE_ZERO_MALLOC is defined. The allocation drivers implemented ** here always fail. SQLite will not operate with these drivers. These ** are merely placeholders. Real drivers must be substituted using ** sqlite3_config() before SQLite will operate. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** This version of the memory allocator is the default. It is ** used when no other memory allocator is specified using compile-time ** macros. */ ................................................................................ ** This file contains low-level memory allocation drivers for when ** SQLite will use the standard C-library malloc/realloc/free interface ** to obtain the memory it needs. ** ** This file contains implementations of the low-level memory allocation ** routines specified in the sqlite3_mem_methods object. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** This version of the memory allocator is the default. It is ** used when no other memory allocator is specified using compile-time ** macros. */ ................................................................................ ** to obtain the memory it needs while adding lots of additional debugging ** information to each allocation in order to help detect and fix memory ** leaks and memory usage errors. ** ** This file contains implementations of the low-level memory allocation ** routines specified in the sqlite3_mem_methods object. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** This version of the memory allocator is used only if the ** SQLITE_MEMDEBUG macro is defined */ #ifdef SQLITE_MEMDEBUG ................................................................................ ** implementations. Once sqlite3_initialize() has been called, ** the amount of memory available to SQLite is fixed and cannot ** be changed. ** ** This version of the memory allocation subsystem is included ** in the build only if SQLITE_ENABLE_MEMSYS3 is defined. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** This version of the memory allocator is only built into the library ** SQLITE_ENABLE_MEMSYS3 is defined. Defining this symbol does not ** mean that the library will use a memory-pool by default, just that ** it is available. The mempool allocator is activated by calling ................................................................................ ** implementations. Once sqlite3_initialize() has been called, ** the amount of memory available to SQLite is fixed and cannot ** be changed. ** ** This version of the memory allocation subsystem is included ** in the build only if SQLITE_ENABLE_MEMSYS5 is defined. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** This version of the memory allocator is used only when ** SQLITE_ENABLE_MEMSYS5 is defined. */ #ifdef SQLITE_ENABLE_MEMSYS5 ................................................................................ ** ************************************************************************* ** This file contains the C functions that implement mutexes. ** ** This file contains code that is common across all mutex implementations. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef SQLITE_MUTEX_OMIT /* ** Initialize the mutex system. */ SQLITE_PRIVATE int sqlite3MutexInit(void){ ................................................................................ ** ** interface. ** ** If compiled with SQLITE_DEBUG, then additional logic is inserted ** that does error checking on mutexes to make sure they are being ** called correctly. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #if defined(SQLITE_MUTEX_NOOP) && !defined(SQLITE_DEBUG) /* ** Stub routines for all mutex methods. ** ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains the C functions that implement mutexes for OS/2 ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** The code in this file is only used if SQLITE_MUTEX_OS2 is defined. ** See the mutex.h file for details. */ #ifdef SQLITE_MUTEX_OS2 ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains the C functions that implement mutexes for pthreads ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** The code in this file is only used if we are compiling threadsafe ** under unix with pthreads. ** ** Note that this implementation requires a version of pthreads that ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains the C functions that implement mutexes for win32 ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** The code in this file is only used if we are compiling multithreaded ** on a win32 system. */ #ifdef SQLITE_MUTEX_W32 ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** Memory allocation functions used throughout sqlite. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** This routine runs when the memory allocator sees that the ** total memory allocation is about to exceed the soft heap ** limit. */ ................................................................................ /* ** Allocate memory. This routine is like sqlite3_malloc() except that it ** assumes the memory subsystem has already been initialized. */ SQLITE_PRIVATE void *sqlite3Malloc(int n){ void *p; if( n<=0 || n>=0x7fffff00 ){ /* A memory allocation of a number of bytes which is near the maximum ** signed integer value might cause an integer overflow inside of the ** xMalloc(). Hence we limit the maximum size to 0x7fffff00, giving ** 255 bytes of overhead. SQLite itself will never use anything near ** this amount. The only way to reach the limit is with sqlite3_malloc() */ p = 0; }else if( sqlite3GlobalConfig.bMemstat ){ sqlite3_mutex_enter(mem0.mutex); mallocWithAlarm(n, &p); sqlite3_mutex_leave(mem0.mutex); }else{ p = sqlite3GlobalConfig.m.xMalloc(n); ................................................................................ */ SQLITE_PRIVATE void *sqlite3Realloc(void *pOld, int nBytes){ int nOld, nNew; void *pNew; if( pOld==0 ){ return sqlite3Malloc(nBytes); } if( nBytes<=0 ){ sqlite3_free(pOld); return 0; } if( nBytes>=0x7fffff00 ){ /* The 0x7ffff00 limit term is explained in comments on sqlite3Malloc() */ return 0; } nOld = sqlite3MallocSize(pOld); if( sqlite3GlobalConfig.bMemstat ){ sqlite3_mutex_enter(mem0.mutex); sqlite3StatusSet(SQLITE_STATUS_MALLOC_SIZE, nBytes); nNew = sqlite3GlobalConfig.m.xRoundup(nBytes); if( nOld==nNew ){ ................................................................................ /* ** The "printf" code that follows dates from the 1980's. It is in ** the public domain. The original comments are included here for ** completeness. They are very out-of-date but might be useful as ** an historical reference. Most of the "enhancements" have been backed ** out so that the functionality is now the same as standard printf(). ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ ** ************************************************************************** ** ** The following modules is an enhanced replacement for the "printf" subroutines ** found in the standard C library. The following enhancements are ** supported: ** ................................................................................ ************************************************************************* ** This file contains code to implement a pseudo-random number ** generator (PRNG) for SQLite. ** ** Random numbers are used by some of the database backends in order ** to generate random integer keys for tables or random filenames. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* All threads share a single random number generator. ** This structure is the current state of the generator. */ static SQLITE_WSD struct sqlite3PrngType { ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains routines used to translate between UTF-8, ** UTF-16, UTF-16BE, and UTF-16LE. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ ** ** Notes on UTF-8: ** ** Byte-0 Byte-1 Byte-2 Byte-3 Value ** 0xxxxxxx 00000000 00000000 0xxxxxxx ** 110yyyyy 10xxxxxx 00000000 00000yyy yyxxxxxx ** 1110zzzz 10yyyyyy 10xxxxxx 00000000 zzzzyyyy yyxxxxxx ................................................................................ ************************************************************************* ** This is the header file for information that is private to the ** VDBE. This information used to all be at the top of the single ** source code file "vdbe.c". When that file became too big (over ** 6000 lines long) it was split up into several smaller files and ** this header information was factored out. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _VDBEINT_H_ #define _VDBEINT_H_ /* ** SQL is translated into a sequence of instructions to be ** executed by a virtual machine. Each instruction is an instance ** of the following structure. */ typedef struct VdbeOp Op; ................................................................................ ** set to 2 for xDestroy method calls and 1 for all other methods. This ** variable is used for two purposes: to allow xDestroy methods to execute ** "DROP TABLE" statements and to prevent some nasty side effects of ** malloc failure when SQLite is invoked recursively by a virtual table ** method function. */ struct Vdbe { sqlite3 *db; /* The database connection that owns this statement */ Vdbe *pPrev,*pNext; /* Linked list of VDBEs with the same Vdbe.db */ int nOp; /* Number of instructions in the program */ int nOpAlloc; /* Number of slots allocated for aOp[] */ Op *aOp; /* Space to hold the virtual machine's program */ int nLabel; /* Number of labels used */ int nLabelAlloc; /* Number of slots allocated in aLabel[] */ int *aLabel; /* Space to hold the labels */ Mem **apArg; /* Arguments to currently executing user function */ Mem *aColName; /* Column names to return */ Mem *pResultSet; /* Pointer to an array of results */ u16 nResColumn; /* Number of columns in one row of the result set */ u16 nCursor; /* Number of slots in apCsr[] */ VdbeCursor **apCsr; /* One element of this array for each open cursor */ u8 errorAction; /* Recovery action to do in case of an error */ u8 okVar; /* True if azVar[] has been initialized */ u16 nVar; /* Number of entries in aVar[] */ Mem *aVar; /* Values for the OP_Variable opcode. */ char **azVar; /* Name of variables */ u32 magic; /* Magic number for sanity checking */ int nMem; /* Number of memory locations currently allocated */ Mem *aMem; /* The memory locations */ int cacheCtr; /* VdbeCursor row cache generation counter */ int contextStackTop; /* Index of top element in the context stack */ int contextStackDepth; /* The size of the "context" stack */ Context *contextStack; /* Stack used by opcodes ContextPush & ContextPop*/ int pc; /* The program counter */ int rc; /* Value to return */ char *zErrMsg; /* Error message written here */ u8 explain; /* True if EXPLAIN present on SQL command */ u8 changeCntOn; /* True to update the change-counter */ u8 expired; /* True if the VM needs to be recompiled */ u8 minWriteFileFormat; /* Minimum file format for writable database files */ u8 inVtabMethod; /* See comments above */ u8 usesStmtJournal; /* True if uses a statement journal */ u8 readOnly; /* True for read-only statements */ u8 isPrepareV2; /* True if prepared with prepare_v2() */ int nChange; /* Number of db changes made since last reset */ int btreeMask; /* Bitmask of db->aDb[] entries referenced */ i64 startTime; /* Time when query started - used for profiling */ BtreeMutexArray aMutex; /* An array of Btree used here and needing locks */ int aCounter[2]; /* Counters used by sqlite3_stmt_status() */ char *zSql; /* Text of the SQL statement that generated this */ void *pFree; /* Free this when deleting the vdbe */ int iStatement; /* Statement number (or 0 if has not opened stmt) */ #ifdef SQLITE_DEBUG FILE *trace; /* Write an execution trace here, if not NULL */ #endif }; /* ** The following are allowed values for Vdbe.magic */ #define VDBE_MAGIC_INIT 0x26bceaa5 /* Building a VDBE program */ ................................................................................ SQLITE_PRIVATE u32 sqlite3VdbeSerialType(Mem*, int); SQLITE_PRIVATE u32 sqlite3VdbeSerialPut(unsigned char*, int, Mem*, int); SQLITE_PRIVATE u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*); SQLITE_PRIVATE void sqlite3VdbeDeleteAuxData(VdbeFunc*, int); int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *); SQLITE_PRIVATE int sqlite3VdbeIdxKeyCompare(VdbeCursor*,UnpackedRecord*,int*); SQLITE_PRIVATE int sqlite3VdbeIdxRowid(sqlite3*, BtCursor *, i64 *); SQLITE_PRIVATE int sqlite3MemCompare(const Mem*, const Mem*, const CollSeq*); SQLITE_PRIVATE int sqlite3VdbeExec(Vdbe*); SQLITE_PRIVATE int sqlite3VdbeList(Vdbe*); SQLITE_PRIVATE int sqlite3VdbeHalt(Vdbe*); SQLITE_PRIVATE int sqlite3VdbeChangeEncoding(Mem *, int); SQLITE_PRIVATE int sqlite3VdbeMemTooBig(Mem*); SQLITE_PRIVATE int sqlite3VdbeMemCopy(Mem*, const Mem*); ................................................................................ ** ************************************************************************* ** Utility functions used throughout sqlite. ** ** This file contains functions for allocating memory, comparing ** strings, and stuff like that. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifdef SQLITE_HAVE_ISNAN # include <math.h> #endif /* ** Routine needed to support the testcase() macro. */ #ifdef SQLITE_COVERAGE_TEST SQLITE_PRIVATE void sqlite3Coverage(int x){ static int dummy = 0; dummy += x; } #endif /* ** Return true if the floating point value is Not a Number (NaN). ** ** Use the math library isnan() function if compiled with SQLITE_HAVE_ISNAN. ** Otherwise, we have our own implementation that works on most systems. ................................................................................ ** ** compare2pow63("9223372036854775800") ** ** will return -8. */ static int compare2pow63(const char *zNum){ int c; c = memcmp(zNum,"922337203685477580",18)*10; if( c==0 ){ c = zNum[18] - '8'; } return c; } ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This is the implementation of generic hash-tables ** used in SQLite. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* Turn bulk memory into a hash table object by initializing the ** fields of the Hash structure. ** ** "pNew" is a pointer to the hash table that is to be initialized. */ ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains code that is specific to OS/2. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #if SQLITE_OS_OS2 /* ** A Note About Memory Allocation: ................................................................................ ** This file contains macros and a little bit of code that is common to ** all of the platform-specific files (os_*.c) and is #included into those ** files. ** ** This file should be #included by the os_*.c files only. It is not a ** general purpose header file. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _OS_COMMON_H_ #define _OS_COMMON_H_ /* ** At least two bugs have slipped in because we changed the MEMORY_DEBUG ** macro to SQLITE_DEBUG and some older makefiles have not yet made the ................................................................................ ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains inline asm code for retrieving "high-performance" ** counters for x86 class CPUs. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _HWTIME_H_ #define _HWTIME_H_ /* ** The following routine only works on pentium-class (or newer) processors. ** It uses the RDTSC opcode to read the cycle count value out of the ................................................................................ ** * Definitions of sqlite3_io_methods objects for all locking ** methods plus "finder" functions for each locking method. ** * sqlite3_vfs method implementations. ** * Locking primitives for the proxy uber-locking-method. (MacOSX only) ** * Definitions of sqlite3_vfs objects for all locking methods ** plus implementations of sqlite3_os_init() and sqlite3_os_end(). ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #if SQLITE_OS_UNIX /* This file is used on unix only */ /* ** There are various methods for file locking used for concurrency ** control: ** ................................................................................ ** This file contains macros and a little bit of code that is common to ** all of the platform-specific files (os_*.c) and is #included into those ** files. ** ** This file should be #included by the os_*.c files only. It is not a ** general purpose header file. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _OS_COMMON_H_ #define _OS_COMMON_H_ /* ** At least two bugs have slipped in because we changed the MEMORY_DEBUG ** macro to SQLITE_DEBUG and some older makefiles have not yet made the ................................................................................ ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains inline asm code for retrieving "high-performance" ** counters for x86 class CPUs. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _HWTIME_H_ #define _HWTIME_H_ /* ** The following routine only works on pentium-class (or newer) processors. ** It uses the RDTSC opcode to read the cycle count value out of the ................................................................................ struct unixOpenCnt **ppOpen /* Return the unixOpenCnt structure here */ ){ int rc; /* System call return code */ int fd; /* The file descriptor for pFile */ struct unixLockKey lockKey; /* Lookup key for the unixLockInfo structure */ struct unixFileId fileId; /* Lookup key for the unixOpenCnt struct */ struct stat statbuf; /* Low-level file information */ struct unixLockInfo *pLock = 0;/* Candidate unixLockInfo object */ struct unixOpenCnt *pOpen; /* Candidate unixOpenCnt object */ /* Get low-level information about the file that we can used to ** create a unique name for the file. */ fd = pFile->h; rc = fstat(fd, &statbuf); ................................................................................ pFile->locktype = SHARED_LOCK; return SQLITE_OK; } /* To fully unlock the database, delete the lock file */ assert( locktype==NO_LOCK ); if( unlink(zLockFile) ){ int rc = 0; int tErrno = errno; if( ENOENT != tErrno ){ rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK); } if( IS_LOCK_ERROR(rc) ){ pFile->lastErrno = tErrno; } return rc; ................................................................................ /* ** Find the current time (in Universal Coordinated Time). Write the ** current time and date as a Julian Day number into *prNow and ** return 0. Return 1 if the time and date cannot be found. */ static int unixCurrentTime(sqlite3_vfs *NotUsed, double *prNow){ #if defined(SQLITE_OMIT_FLOATING_POINT) time_t t; time(&t); *prNow = (((sqlite3_int64)t)/8640 + 24405875)/10; #elif defined(NO_GETTOD) time_t t; time(&t); *prNow = t/86400.0 + 2440587.5; #elif OS_VXWORKS struct timespec sNow; clock_gettime(CLOCK_REALTIME, &sNow); *prNow = 2440587.5 + sNow.tv_sec/86400.0 + sNow.tv_nsec/86400000000000.0; ................................................................................ ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains code that is specific to windows. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #if SQLITE_OS_WIN /* This file is used for windows only */ /* ** A Note About Memory Allocation: ** ................................................................................ ** This file contains macros and a little bit of code that is common to ** all of the platform-specific files (os_*.c) and is #included into those ** files. ** ** This file should be #included by the os_*.c files only. It is not a ** general purpose header file. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _OS_COMMON_H_ #define _OS_COMMON_H_ /* ** At least two bugs have slipped in because we changed the MEMORY_DEBUG ** macro to SQLITE_DEBUG and some older makefiles have not yet made the ................................................................................ ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This file contains inline asm code for retrieving "high-performance" ** counters for x86 class CPUs. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef _HWTIME_H_ #define _HWTIME_H_ /* ** The following routine only works on pentium-class (or newer) processors. ** It uses the RDTSC opcode to read the cycle count value out of the ................................................................................ ** Clear operations are exceedingly rare. There are usually between ** 5 and 500 set operations per Bitvec object, though the number of sets can ** sometimes grow into tens of thousands or larger. The size of the ** Bitvec object is the number of pages in the database file at the ** start of a transaction, and is thus usually less than a few thousand, ** but can be as large as 2 billion for a really big database. ** ** @(#) $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* Size of the Bitvec structure in bytes. */ #define BITVEC_SZ 512 /* Round the union size down to the nearest pointer boundary, since that's how ** it will be aligned within the Bitvec struct. */ ................................................................................ ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file implements that page cache. ** ** @(#) $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** A complete page cache is an instance of this structure. */ struct PCache { PgHdr *pDirty, *pDirtyTail; /* List of dirty pages in LRU order */ ................................................................................ ** ** This file implements the default page cache implementation (the ** sqlite3_pcache interface). It also contains part of the implementation ** of the SQLITE_CONFIG_PAGECACHE and sqlite3_release_memory() features. ** If the default page cache implementation is overriden, then neither of ** these two features are available. ** ** @(#) $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ typedef struct PCache1 PCache1; typedef struct PgHdr1 PgHdr1; typedef struct PgFreeslot PgFreeslot; ................................................................................ ** The cost of a TEST using the same batch number is O(logN). The cost ** of the first SMALLEST is O(NlogN). Second and subsequent SMALLEST ** primitives are constant time. The cost of DESTROY is O(N). ** ** There is an added cost of O(N) when switching between TEST and ** SMALLEST primitives. ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ /* ** Target size for allocation chunks. */ #define ROWSET_ALLOCATION_SIZE 1024 ................................................................................ ** The pager is used to access a database disk file. It implements ** atomic commit and rollback through the use of a journal file that ** is separate from the database file. The pager also implements file ** locking to prevent two processes from writing the same database ** file simultaneously, or one process from reading the database while ** another is writing. ** ** @(#) $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ */ #ifndef SQLITE_OMIT_DISKIO /* ** Macros for troubleshooting. Normally turned off */ #if 0 ................................................................................ #define PAGER_SYNCED 5 /* ** A macro used for invoking the codec if there is one */ #ifdef SQLITE_HAS_CODEC # define CODEC1(P,D,N,X,E) \ if( P->xCodec && P->xCodec(P->pCodec,D,N,X)==0 ){ E; } # define CODEC2(P,D,N,X,E,O) \ if( P->xCodec==0 ){ O=(char*)D; }else \ if( (O=(char*)(P->xCodec(P->pCodec,D,N,X)))==0 ){ E; } #else # define CODEC1(P,D,N,X,E) /* NO-OP */ # define CODEC2(P,D,N,X,E,O) O=(char*)D #endif /* ** The maximum allowed sector size. 16MB. If the xSectorsize() method ................................................................................ i64 journalOff; /* Current write offset in the journal file */ i64 journalHdr; /* Byte offset to previous journal header */ PagerSavepoint *aSavepoint; /* Array of active savepoints */ int nSavepoint; /* Number of elements in aSavepoint[] */ char dbFileVers[16]; /* Changes whenever database file changes */ u32 sectorSize; /* Assumed sector size during rollback */ u16 nExtra; /* Add this many bytes to each in-memory page */ i16 nReserve; /* Number of unused bytes at end of each page */ u32 vfsFlags; /* Flags for sqlite3_vfs.xOpen() */ int pageSize; /* Number of bytes in a page */ Pgno mxPgno; /* Maximum allowed size of the database */ char *zFilename; /* Name of the database file */ char *zJournal; /* Name of the journal file */ int (*xBusyHandler)(void*); /* Function to call when busy */ void *pBusyHandlerArg; /* Context argument for xBusyHandler */ ................................................................................ #ifdef SQLITE_TEST int nHit, nMiss; /* Cache hits and missing */ int nRead, nWrite; /* Database pages read/written */ #endif void (*xReiniter)(DbPage*); /* Call this routine when reloading pages */ #ifdef SQLITE_HAS_CODEC void *(*xCodec)(void*,void*,Pgno,int); /* Routine for en/decoding data */ void (*xCodecSizeChng)(void*,int,int); /* Notify of page size changes */ void (*xCodecFree)(void*); /* Destructor for the codec */ void *pCodec; /* First argument to xCodec... methods */ #endif char *pTmpSpace; /* Pager.pageSize bytes of space for tmp use */ i64 journalSizeLimit; /* Size limit for persistent journal files */ PCache *pPCache; /* Pointer to page cache object */ sqlite3_backup *pBackup; /* Pointer to list of ongoing backup processes */ }; ................................................................................ for(ii=0; ii<pPager->nSavepoint; ii++){ if( pPager->aSavepoint[ii].iHdrOffset==0 ){ pPager->aSavepoint[ii].iHdrOffset = pPager->journalOff; } } pPager->journalHdr = pPager->journalOff = journalHdrOffset(pPager); /* ** Write the nRec Field - the number of page records that follow this ** journal header. Normally, zero is written to this value at this time. ** After the records are added to the journal (and the journal synced, ** if in full-sync mode), the zero is overwritten with the true number ** of records (see syncJournal()). ................................................................................ ** * When the SQLITE_IOCAP_SAFE_APPEND flag is set. This guarantees ** that garbage data is never appended to the journal file. */ assert( isOpen(pPager->fd) || pPager->noSync ); if( (pPager->noSync) || (pPager->journalMode==PAGER_JOURNALMODE_MEMORY) || (sqlite3OsDeviceCharacteristics(pPager->fd)&SQLITE_IOCAP_SAFE_APPEND) ){ memcpy(zHeader, aJournalMagic, sizeof(aJournalMagic)); put32bits(&zHeader[sizeof(aJournalMagic)], 0xffffffff); }else{ zHeader[0] = '\0'; put32bits(&zHeader[sizeof(aJournalMagic)], 0); } /* The random check-hash initialiser */ sqlite3_randomness(sizeof(pPager->cksumInit), &pPager->cksumInit); put32bits(&zHeader[sizeof(aJournalMagic)+4], pPager->cksumInit); /* The initial database size */ ................................................................................ ** ** If the journal header file appears to be corrupted, SQLITE_DONE is ** returned and *pNRec and *PDbSize are undefined. If JOURNAL_HDR_SZ bytes ** cannot be read from the journal file an error code is returned. */ static int readJournalHdr( Pager *pPager, /* Pager object */ int isHot, i64 journalSize, /* Size of the open journal file in bytes */ u32 *pNRec, /* OUT: Value read from the nRec field */ u32 *pDbSize /* OUT: Value of original database size field */ ){ int rc; /* Return code */ unsigned char aMagic[8]; /* A buffer to hold the magic header */ i64 iHdrOff; /* Offset of journal header being read */ ................................................................................ iHdrOff = pPager->journalOff; /* Read in the first 8 bytes of the journal header. If they do not match ** the magic string found at the start of each journal header, return ** SQLITE_DONE. If an IO error occurs, return an error code. Otherwise, ** proceed. */ if( isHot || iHdrOff!=pPager->journalHdr ){ rc = sqlite3OsRead(pPager->jfd, aMagic, sizeof(aMagic), iHdrOff); if( rc ){ return rc; } if( memcmp(aMagic, aJournalMagic, sizeof(aMagic))!=0 ){ return SQLITE_DONE; } } /* Read the first three 32-bit fields of the journal header: The nRec ** field, the checksum-initializer and the database size at the start ** of the transaction. Return an error code if anything goes wrong. */ if( SQLITE_OK!=(rc = read32bits(pPager->jfd, iHdrOff+8, pNRec)) ................................................................................ } /* Update the page-size to match the value read from the journal. ** Use a testcase() macro to make sure that malloc failure within ** PagerSetPagesize() is tested. */ iPageSize16 = (u16)iPageSize; rc = sqlite3PagerSetPagesize(pPager, &iPageSize16, -1); testcase( rc!=SQLITE_OK ); assert( rc!=SQLITE_OK || iPageSize16==(u16)iPageSize ); /* Update the assumed sector-size to match the value used by ** the process that created this journal. If this journal was ** created by a process other than this one, then this routine ** is being called from within pager_playback(). The local value ................................................................................ && !isUnsync ){ i64 ofst = (pgno-1)*(i64)pPager->pageSize; rc = sqlite3OsWrite(pPager->fd, aData, pPager->pageSize, ofst); if( pgno>pPager->dbFileSize ){ pPager->dbFileSize = pgno; } if( pPager->pBackup ){ CODEC1(pPager, aData, pgno, 3, rc=SQLITE_NOMEM); sqlite3BackupUpdate(pPager->pBackup, pgno, aData); CODEC1(pPager, aData, pgno, 0, rc=SQLITE_NOMEM); } }else if( !isMainJrnl && pPg==0 ){ /* If this is a rollback of a savepoint and data was not written to ** the database and the page is not in-memory, there is a potential ** problem. When the page is next fetched by the b-tree layer, it ** will be read from the database file, which may or may not be ** current. ** ................................................................................ int isUnsync = 0; /* Read the next journal header from the journal file. If there are ** not enough bytes left in the journal file for a complete header, or ** it is corrupted, then a process must of failed while writing it. ** This indicates nothing more needs to be rolled back. */ rc = readJournalHdr(pPager, isHot, szJ, &nRec, &mxPg); if( rc!=SQLITE_OK ){ if( rc==SQLITE_DONE ){ rc = SQLITE_OK; } goto end_playback; } ................................................................................ ** of the main journal file. Continue to skip out-of-range pages and ** continue adding pages rolled back to pDone. */ while( rc==SQLITE_OK && pPager->journalOff<szJ ){ u32 ii; /* Loop counter */ u32 nJRec = 0; /* Number of Journal Records */ u32 dummy; rc = readJournalHdr(pPager, 0, szJ, &nJRec, &dummy); assert( rc!=SQLITE_DONE ); /* ** The "pPager->journalHdr+JOURNAL_HDR_SZ(pPager)==pPager->journalOff" ** test is related to ticket #2565. See the discussion in the ** pager_playback() function for additional information. */ ................................................................................ ** higher-level code an opportunity to restore the EXTRA section to ** agree with the restored page data. */ SQLITE_PRIVATE void sqlite3PagerSetReiniter(Pager *pPager, void (*xReinit)(DbPage*)){ pPager->xReiniter = xReinit; } /* ** Report the current page size and number of reserved bytes back ** to the codec. */ #ifdef SQLITE_HAS_CODEC static void pagerReportSize(Pager *pPager){ if( pPager->xCodecSizeChng ){ pPager->xCodecSizeChng(pPager->pCodec, pPager->pageSize, (int)pPager->nReserve); } } #else # define pagerReportSize(X) /* No-op if we do not support a codec */ #endif /* ** Change the page size used by the Pager object. The new page size ** is passed in *pPageSize. ** ** If the pager is in the error state when this function is called, it ** is a no-op. The value returned is the error state error code (i.e. ** one of SQLITE_IOERR, SQLITE_CORRUPT or SQLITE_FULL). ................................................................................ ** In all other cases, SQLITE_OK is returned. ** ** If the page size is not changed, either because one of the enumerated ** conditions above is not true, the pager was in error state when this ** function was called, or because the memory allocation attempt failed, ** then *pPageSize is set to the old, retained page size before returning. */ SQLITE_PRIVATE int sqlite3PagerSetPagesize(Pager *pPager, u16 *pPageSize, int nReserve){ int rc = pPager->errCode; if( rc==SQLITE_OK ){ u16 pageSize = *pPageSize; assert( pageSize==0 || (pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE) ); if( pageSize && pageSize!=pPager->pageSize && (pPager->memDb==0 || pPager->dbSize==0) && sqlite3PcacheRefCount(pPager->pPCache)==0 ................................................................................ pPager->pageSize = pageSize; sqlite3PageFree(pPager->pTmpSpace); pPager->pTmpSpace = pNew; sqlite3PcacheSetPageSize(pPager->pPCache, pageSize); } } *pPageSize = (u16)pPager->pageSize; if( nReserve<0 ) nReserve = pPager->nReserve; assert( nReserve>=0 && nReserve<1000 ); pPager->nReserve = (i16)nReserve; pagerReportSize(pPager); } return rc; } /* ** Return a pointer to the "temporary page" buffer held internally ** by the pager. This is a buffer that is big enough to hold the ................................................................................ sqlite3EndBenignMalloc(); enable_simulated_io_errors(); PAGERTRACE(("CLOSE %d\n", PAGERID(pPager))); IOTRACE(("CLOSE %p\n", pPager)) sqlite3OsClose(pPager->fd); sqlite3PageFree(pPager->pTmpSpace); sqlite3PcacheClose(pPager->pPCache); #ifdef SQLITE_HAS_CODEC if( pPager->xCodecFree ) pPager->xCodecFree(pPager->pCodec); #endif assert( !pPager->aSavepoint && !pPager->pInJournal ); assert( !isOpen(pPager->jfd) && !isOpen(pPager->sjfd) ); sqlite3_free(pPager); return SQLITE_OK; } ................................................................................ assert( !pPager->tempFile ); if( pPager->journalMode!=PAGER_JOURNALMODE_MEMORY ){ int rc; /* Return code */ const int iDc = sqlite3OsDeviceCharacteristics(pPager->fd); assert( isOpen(pPager->jfd) ); if( 0==(iDc&SQLITE_IOCAP_SAFE_APPEND) ){ /* This block deals with an obscure problem. If the last connection ** that wrote to this database was operating in persistent-journal ** mode, then the journal file may at this point actually be larger ** than Pager.journalOff bytes. If the next thing in the journal ** file happens to be a journal-header (written as part of the ** previous connections transaction), and a crash or power-failure ** occurs after nRec is updated but before this connection writes ................................................................................ ** byte to the start of it to prevent it from being recognized. ** ** Variable iNextHdrOffset is set to the offset at which this ** problematic header will occur, if it exists. aMagic is used ** as a temporary buffer to inspect the first couple of bytes of ** the potential journal header. */ i64 iNextHdrOffset; u8 aMagic[8]; u8 zHeader[sizeof(aJournalMagic)+4]; memcpy(zHeader, aJournalMagic, sizeof(aJournalMagic)); put32bits(&zHeader[sizeof(aJournalMagic)], pPager->nRec); iNextHdrOffset = journalHdrOffset(pPager); rc = sqlite3OsRead(pPager->jfd, aMagic, 8, iNextHdrOffset); if( rc==SQLITE_OK && 0==memcmp(aMagic, aJournalMagic, 8) ){ static const u8 zerobyte = 0; rc = sqlite3OsWrite(pPager->jfd, &zerobyte, 1, iNextHdrOffset); } if( rc!=SQLITE_OK && rc!=SQLITE_IOERR_SHORT_READ ){ return rc; ................................................................................ */ if( pPager->fullSync && 0==(iDc&SQLITE_IOCAP_SEQUENTIAL) ){ PAGERTRACE(("SYNC journal of %d\n", PAGERID(pPager))); IOTRACE(("JSYNC %p\n", pPager)) rc = sqlite3OsSync(pPager->jfd, pPager->sync_flags); if( rc!=SQLITE_OK ) return rc; } IOTRACE(("JHDR %p %lld\n", pPager, pPager->journalHdr)); rc = sqlite3OsWrite( pPager->jfd, zHeader, sizeof(zHeader), pPager->journalHdr ); if( rc!=SQLITE_OK ) return rc; } if( 0==(iDc&SQLITE_IOCAP_SEQUENTIAL) ){ PAGERTRACE(("SYNC journal of %d\n", PAGERID(pPager))); IOTRACE(("JSYNC %p\n", pPager)) rc = sqlite3OsSync(pPager->jfd, pPager->sync_flags| (pPager->sync_flags==SQLITE_SYNC_FULL?SQLITE_SYNC_DATAONLY:0) ................................................................................ memcpy(&pPager->dbFileVers, &pData[24], sizeof(pPager->dbFileVers)); } if( pgno>pPager->dbFileSize ){ pPager->dbFileSize = pgno; } /* Update any backup objects copying the contents of this pager. */ sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)pList->pData); PAGERTRACE(("STORE %d page %d hash(%08x)\n", PAGERID(pPager), pgno, pager_pagehash(pList))); IOTRACE(("PGOUT %p %d\n", pPager, pgno)); PAGER_INCR(sqlite3_pager_writedb_count); PAGER_INCR(pPager->nWrite); }else{ ................................................................................ } /* The following call to PagerSetPagesize() serves to set the value of ** Pager.pageSize and to allocate the Pager.pTmpSpace buffer. */ if( rc==SQLITE_OK ){ assert( pPager->memDb==0 ); rc = sqlite3PagerSetPagesize(pPager, &szPageDflt, -1); testcase( rc!=SQLITE_OK ); } /* If an error occurred in either of the blocks above, free the ** Pager structure and close the file. */ if( rc!=SQLITE_OK ){ ................................................................................ assert( !pPager->pTmpSpace ); sqlite3OsClose(pPager->fd); sqlite3_free(pPager); return rc; } /* Initialize the PCache object. */ assert( nExtra<1000 ); nExtra = ROUND8(nExtra); sqlite3PcacheOpen(szPageDflt, nExtra, !memDb, !memDb?pagerStress:0, (void *)pPager, pPager->pPCache); PAGERTRACE(("OPEN %d %s\n", FILEHANDLEID(pPager->fd), pPager->zFilename)); IOTRACE(("OPEN %p %s\n", pPager, pPager->zFilename)) ................................................................................ /* pPager->needSync = 0; */ pPager->noSync = (pPager->tempFile || !useJournal) ?1:0; pPager->fullSync = pPager->noSync ?0:1; pPager->sync_flags = SQLITE_SYNC_NORMAL; /* pPager->pFirst = 0; */ /* pPager->pFirstSynced = 0; */ /* pPager->pLast = 0; */ pPager->nExtra = (u16)nExtra; pPager->journalSizeLimit = SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT; assert( isOpen(pPager->fd) || tempFile ); setSectorSize(pPager); if( memDb ){ pPager->journalMode = PAGER_JOURNALMODE_MEMORY; } /* pPager->xBusyHandler = 0; */ ................................................................................ ** IO error occurs while locking the database, checking for a hot-journal ** file or rolling back a journal file, the IO error code is returned. */ static int pagerSharedLock(Pager *pPager){ int rc = SQLITE_OK; /* Return code */ int isErrorReset = 0; /* True if recovering from error state */ /* If this database has no outstanding page references and is in an ** error-state, this is a chance to clear the error. Discard the ** contents of the pager-cache and rollback any hot journal in the ** file-system. */ if( !MEMDB && sqlite3PcacheRefCount(pPager->pPCache)==0 && pPager->errCode ){ if( isOpen(pPager->jfd) || pPager->zJournal ){ isErrorReset = 1; } pPager->errCode = SQLITE_OK; pager_reset(pPager); } /* If the pager is still in an error state, do not proceed. The error ................................................................................ rc = sqlite3OsOpen(pVfs, pPager->zJournal, pPager->jfd, f, &fout); assert( rc!=SQLITE_OK || isOpen(pPager->jfd) ); if( rc==SQLITE_OK && fout&SQLITE_OPEN_READONLY ){ rc = SQLITE_CANTOPEN; sqlite3OsClose(pPager->jfd); } }else{ /* If the journal does not exist, it usually means that some ** other connection managed to get in and roll it back before ** this connection obtained the exclusive lock above. Or, it ** may mean that the pager was in the error-state when this ** function was called and the journal file does not exist. */ rc = pager_end_transaction(pPager, 0); } } } if( rc!=SQLITE_OK ){ goto failed; } ................................................................................ pPager->journalHdr = 0; /* Playback and delete the journal. Drop the database write ** lock and reacquire the read lock. Purge the cache before ** playing back the hot-journal so that we don't end up with ** an inconsistent cache. */ if( isOpen(pPager->jfd) ){ rc = pager_playback(pPager, 1); if( rc!=SQLITE_OK ){ rc = pager_error(pPager, rc); goto failed; } } assert( (pPager->state==PAGER_SHARED) || (pPager->exclusiveMode && pPager->state>PAGER_SHARED) ); } if( pPager->pBackup || sqlite3PcachePagecount(pPager->pPCache)>0 ){ ................................................................................ if( rc!=SQLITE_OK ){ return rc; } assert( pPager->state!=PAGER_UNLOCK ); rc = sqlite3PcacheFetch(pPager->pPCache, pgno, 1, &pPg); if( rc!=SQLITE_OK ){ pagerUnlockIfUnused(pPager); return rc; } assert( pPg->pgno==pgno ); assert( pPg->pPager==pPager || pPg->pPager==0 ); if( pPg->pPager==0 ){ /* The pager cache has created a new page. Its content needs to ** be initialized. ................................................................................ */ SQLITE_PRIVATE int sqlite3PagerNosync(Pager *pPager){ return pPager->noSync; } #ifdef SQLITE_HAS_CODEC /* ** Set or retrieve the codec for this pager */ static void sqlite3PagerSetCodec( Pager *pPager, void *(*xCodec)(void*,void*,Pgno,int), void (*xCodecSizeChng)(void*,int,int), void (*xCodecFree)(void*), void *pCodec ){ if( pPager->xCodecFree ) pPager->xCodecFree(pPager->pCodec); pPager->xCodec = xCodec; pPager->xCodecSizeChng = xCodecSizeChng; pPager->xCodecFree = xCodecFree; pPager->pCodec = pCodec; pagerReportSize(pPager); } static void *sqlite3PagerGetCodec(Pager *pPager){ return pPager->pCodec; } #endif #ifndef SQLITE_OMIT_AUTOVACUUM /* ** Move the page pPg to location pgno in the file. ** ................................................................................ ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ ** ** This file contains code used to implement mutexes on Btree objects. ** This code really belongs in btree.c. But btree.c is getting too ** big and we want to break it down some. This packaged seemed like ** a good breakout. */ /************** Include btreeInt.h in the middle of btmutex.c ****************/ ................................................................................ ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ ** ** This file implements a external (disk-based) database using BTrees. ** For a detailed discussion of BTrees, refer to ** ** Donald E. Knuth, THE ART OF COMPUTER PROGRAMMING, Volume 3: ** "Sorting And Searching", pages 473-480. Addison-Wesley ** Publishing Company, Reading, Massachusetts. ................................................................................ ** 22 1 Min embedded payload fraction ** 23 1 Min leaf payload fraction ** 24 4 File change counter ** 28 4 Reserved for future use ** 32 4 First freelist page ** 36 4 Number of freelist pages in the file ** 40 60 15 4-byte meta values passed to higher layers ** ** 40 4 Schema cookie ** 44 4 File format of schema layer ** 48 4 Size of page cache ** 52 4 Largest root-page (auto/incr_vacuum) ** 56 4 1=UTF-8 2=UTF16le 3=UTF16be ** 60 4 User version ** 64 4 Incremental vacuum mode ** 68 4 unused ** 72 4 unused ** 76 4 unused ** ** All of the integer values are big-endian (most significant byte first). ** ** The file change counter is incremented when the database is changed ** This counter allows other processes to know when the file has changed ** and thus when they need to flush their cache. ** ................................................................................ void *pKey; /* Saved key that was cursor's last known position */ i64 nKey; /* Size of pKey, or last integer key */ int skip; /* (skip<0) -> Prev() is a no-op. (skip>0) -> Next() is */ #ifndef SQLITE_OMIT_INCRBLOB u8 isIncrblobHandle; /* True if this cursor is an incr. io handle */ Pgno *aOverflow; /* Cache of overflow page locations */ #endif i16 iPage; /* Index of current page in apPage */ MemPage *apPage[BTCURSOR_MAX_DEPTH]; /* Pages from root to current page */ u16 aiIdx[BTCURSOR_MAX_DEPTH]; /* Current index in apPage[i] */ }; /* ** Potential values for BtCursor.eState. ................................................................................ ** Internal routines that should be accessed by the btree layer only. */ SQLITE_PRIVATE int sqlite3BtreeGetPage(BtShared*, Pgno, MemPage**, int); SQLITE_PRIVATE int sqlite3BtreeInitPage(MemPage *pPage); SQLITE_PRIVATE void sqlite3BtreeParseCellPtr(MemPage*, u8*, CellInfo*); SQLITE_PRIVATE void sqlite3BtreeParseCell(MemPage*, int, CellInfo*); SQLITE_PRIVATE int sqlite3BtreeRestoreCursorPosition(BtCursor *pCur); SQLITE_PRIVATE void sqlite3BtreeMoveToParent(BtCursor *pCur); #ifdef SQLITE_TEST SQLITE_PRIVATE void sqlite3BtreeGetTempCursor(BtCursor *pCur, BtCursor *pTempCur); SQLITE_PRIVATE void sqlite3BtreeReleaseTempCursor(BtCursor *pCur); #endif /************** End of btreeInt.h ********************************************/ /************** Continuing where we left off in btmutex.c ********************/ #ifndef SQLITE_OMIT_SHARED_CACHE #if SQLITE_THREADSAFE /* ................................................................................ ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** $Id: sqlite3.c,v 1.15 2009/06/29 22:59:09 rmsimpson Exp $ ** ** This file implements a external (disk-based) database using BTrees. ** See the header comment on "btreeInt.h" for additional information. ** Including a description of file format and an overview of operation. */ /* ................................................................................ if( *pEType<1 || *pEType>5 ) return SQLITE_CORRUPT_BKPT; return SQLITE_OK; } #else /* if defined SQLITE_OMIT_AUTOVACUUM */ #define ptrmapPut(w,x,y,z) SQLITE_OK #define ptrmapGet(w,x,y,z) SQLITE_OK #endif /* ** Given a btree page and a cell index (0 means the first cell on ** the page, 1 means the second cell, and so forth) return a pointer ** to the cell content. ** ................................................................................ ** for the overflow page. */ static int ptrmapPutOvflPtr(MemPage *pPage, u8 *pCell){ CellInfo info; assert( pCell!=0 ); sqlite3BtreeParseCellPtr(pPage, pCell, &info); assert( (info.nData+(pPage->intKey?0:info.nKey))==info.nPayload ); if( info.iOverflow ){ Pgno ovfl = get4byte(&pCell[info.iOverflow]); return ptrmapPut(pPage->pBt, ovfl, PTRMAP_OVERFLOW1, pPage->pgno); } return SQLITE_OK; } #endif /* ** Defragment the page given. All Cells are moved to the ** end of the page and all free space is collected into one ** big FreeBlk that occurs in between the header and cell ................................................................................ /* Assert that the space between the cell-offset array and the ** cell-content area is greater than nByte bytes. */ assert( nByte <= ( get2byte(&data[hdr+5])-(hdr+8+(pPage->leaf?0:4)+2*get2byte(&data[hdr+3])) )); nFrag = data[hdr+7]; if( nFrag>=60 ){ defragmentPage(pPage); }else{ /* Search the freelist looking for a free slot big enough to satisfy ** the request. The allocation is made from the first free slot in ** the list that is large enough to accomadate it. ................................................................................ if ( pbegin>pPage->pBt->usableSize-4 ) { return SQLITE_CORRUPT_BKPT; } assert( pbegin>addr || pbegin==0 ); put2byte(&data[addr], start); put2byte(&data[start], pbegin); put2byte(&data[start+2], size); pPage->nFree = pPage->nFree + (u16)size; /* Coalesce adjacent free blocks */ addr = pPage->hdrOffset + 1; while( (pbegin = get2byte(&data[addr]))>0 ){ int pnext, psize, x; assert( pbegin>addr ); assert( pbegin<=pPage->pBt->usableSize-4 ); ................................................................................ } next = get2byte(&data[pc]); size = get2byte(&data[pc+2]); if( next>0 && next<=pc+size+3 ){ /* Free blocks must be in accending order */ return SQLITE_CORRUPT_BKPT; } nFree = nFree + size; pc = next; } /* At this point, nFree contains the sum of the offset to the start ** of the cell-content area plus the number of free bytes within ** the cell-content area. If this is greater than the usable-size ** of the page, then the page must be corrupted. This check also ................................................................................ nReserve = zDbHeader[20]; pBt->pageSizeFixed = 1; #ifndef SQLITE_OMIT_AUTOVACUUM pBt->autoVacuum = (get4byte(&zDbHeader[36 + 4*4])?1:0); pBt->incrVacuum = (get4byte(&zDbHeader[36 + 7*4])?1:0); #endif } rc = sqlite3PagerSetPagesize(pBt->pPager, &pBt->pageSize, nReserve); if( rc ) goto btree_open_out; pBt->usableSize = pBt->pageSize - nReserve; assert( (pBt->pageSize & 7)==0 ); /* 8-byte alignment of pageSize */ #if !defined(SQLITE_OMIT_SHARED_CACHE) && !defined(SQLITE_OMIT_DISKIO) /* Add the new BtShared object to the linked list sharable BtShareds. */ ................................................................................ assert( nReserve>=0 && nReserve<=255 ); if( pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE && ((pageSize-1)&pageSize)==0 ){ assert( (pageSize & 7)==0 ); assert( !pBt->pPage1 && !pBt->pCursor ); pBt->pageSize = (u16)pageSize; freeTempSpace(pBt); } rc = sqlite3PagerSetPagesize(pBt->pPager, &pBt->pageSize, nReserve); pBt->usableSize = pBt->pageSize - (u16)nReserve; if( iFix ) pBt->pageSizeFixed = 1; sqlite3BtreeLeave(p); return rc; } /* ................................................................................ ** zero and return SQLITE_OK. The caller will call this function ** again with the correct page-size. */ releasePage(pPage1); pBt->usableSize = (u16)usableSize; pBt->pageSize = (u16)pageSize; freeTempSpace(pBt); rc = sqlite3PagerSetPagesize(pBt->pPager, &pBt->pageSize, pageSize-usableSize); if( rc ) goto page1_init_failed; return SQLITE_OK; } if( usableSize<480 ){ goto page1_init_failed; } pBt->pageSize = (u16)pageSize; pBt->usableSize = (u16)usableSize; #ifndef SQLITE_OMIT_AUTOVACUUM pBt->autoVacuum = (get4byte(&page1[36 + 4*4])?1:0); pBt->incrVacuum = (get4byte(&page1[36 + 7*4])?1:0); ................................................................................ ** If there are any outstanding cursors, this routine is a no-op. ** ** If there is a transaction in progress, this routine is a no-op. */ static void unlockBtreeIfUnused(BtShared *pBt){ assert( sqlite3_mutex_held(pBt->mutex) ); if( pBt->inTransaction==TRANS_NONE && pBt->pCursor==0 && pBt->pPage1!=0 ){ assert( pBt->pPage1->aData ); assert( sqlite3PagerRefcount(pBt->pPager)==1 ); assert( pBt->pPage1->aData ); releasePage(pBt->pPage1); pBt->pPage1 = 0; } } /* ** Create a new database by initializing the first page of the ** file. ................................................................................ invalidateOverflowCache(pCur); /* sqlite3_free(pCur); */ sqlite3BtreeLeave(pBtree); } return SQLITE_OK; } #ifdef SQLITE_TEST /* ** Make a temporary cursor by filling in the fields of pTempCur. ** The temporary cursor is not on the cursor list for the Btree. */ SQLITE_PRIVATE void sqlite3BtreeGetTempCursor(BtCursor *pCur, BtCursor *pTempCur){ int i; assert( cursorHoldsMutex(pCur) ); ................................................................................ pTempCur->pNext = 0; pTempCur->pPrev = 0; for(i=0; i<=pTempCur->iPage; i++){ sqlite3PagerRef(pTempCur->apPage[i]->pDbPage); } assert( pTempCur->pKey==0 ); } #endif /* SQLITE_TEST */ #ifdef SQLITE_TEST /* ** Delete a temporary cursor such as was made by the CreateTemporaryCursor() ** function above. */ SQLITE_PRIVATE void sqlite3BtreeReleaseTempCursor(BtCursor *pCur){ int i; assert( cursorHoldsMutex(pCur) ); for(i=0; i<=pCur->iPage; i++){ sqlite3PagerUnref(pCur->apPage[i]->pDbPage); } sqlite3_free(pCur->pKey); } #endif /* SQLITE_TEST */ /* ** Make sure the BtCursor* given in the argument has a valid ** BtCursor.info structure. If it is not already valid, call ** sqlite3BtreeParseCell() to fill it in. ** ** BtCursor.info is a cache of the information in the current cell. ................................................................................ Pgno *pPgno, Pgno nearby, u8 exact ){ MemPage *pPage1; int rc; u32 n; /* Number of pages on the freelist */ u32 k; /* Number of leaves on the trunk of the freelist */ MemPage *pTrunk = 0; MemPage *pPrevTrunk = 0; Pgno mxPage; /* Total size of the database file */ assert( sqlite3_mutex_held(pBt->mutex) ); pPage1 = pBt->pPage1; mxPage = pagerPagecount(pBt); ................................................................................ goto end_allocate_page; } *pPgno = iTrunk; memcpy(&pPage1->aData[32], &pTrunk->aData[0], 4); *ppPage = pTrunk; pTrunk = 0; TRACE(("ALLOCATE: %d trunk - %d free pages left\n", *pPgno, n-1)); }else if( k>(u32)(pBt->usableSize/4 - 2) ){ /* Value of k is out of range. Database corruption */ rc = SQLITE_CORRUPT_BKPT; goto end_allocate_page; #ifndef SQLITE_OMIT_AUTOVACUUM }else if( searchList && nearby==iTrunk ){ /* The list is being searched and this trunk page is the page ** to allocate, regardless of whether it has leaves. ................................................................................ } put4byte(&pPrevTrunk->aData[0], iNewTrunk); } } pTrunk = 0; TRACE(("ALLOCATE: %d trunk - %d free pages left\n", *pPgno, n-1)); #endif }else if( k>0 ){ /* Extract a leaf from the trunk */ u32 closest; Pgno iPage; unsigned char *aData = pTrunk->aData; rc = sqlite3PagerWrite(pTrunk->pDbPage); if( rc ){ goto end_allocate_page; } if( nearby>0 ){ u32 i; int dist; closest = 0; dist = get4byte(&aData[8]) - nearby; if( dist<0 ) dist = -dist; for(i=1; i<k; i++){ int d2 = get4byte(&aData[8+i*4]) - nearby; if( d2<0 ) d2 = -d2; if( d2<dist ){ ................................................................................ goto end_allocate_page; } if( !searchList || iPage==nearby ){ int noContent; Pgno nPage; *pPgno = iPage; nPage = pagerPagecount(pBt); if( iPage>nPage ){ /* Free page off the end of the file */ rc = SQLITE_CORRUPT_BKPT; goto end_allocate_page; } TRACE(("ALLOCATE: %d was leaf %d of %d on trunk %d" ": %d more free pages\n", *pPgno, closest+1, k, pTrunk->pgno, n-1)); ................................................................................ */ static int insertCell( MemPage *pPage, /* Page into which we are copying */ int i, /* New cell becomes the i-th cell of the page */ u8 *pCell, /* Content of the new cell */ int sz, /* Bytes of content in pCell */ u8 *pTemp, /* Temp storage space for pCell, if needed */ Pgno iChild /* If non-zero, replace first 4 bytes with this value */ ){ int idx; /* Where to write new cell content in data[] */ int j; /* Loop counter */ int top; /* First byte of content for any cell in data[] */ int end; /* First byte past the last cell pointer in data[] */ int ins; /* Index in data[] where new cell pointer is inserted */ int hdr; /* Offset into data[] of the page header */ int cellOffset; /* Address of first cell pointer in data[] */ u8 *data; /* The content of the whole page */ u8 *ptr; /* Used for moving information around in data[] */ int nSkip = (iChild ? 4 : 0); assert( i>=0 && i<=pPage->nCell+pPage->nOverflow ); assert( pPage->nCell<=MX_CELL(pPage->pBt) && MX_CELL(pPage->pBt)<=5460 ); assert( pPage->nOverflow<=ArraySize(pPage->aOvfl) ); assert( sz==cellSizePtr(pPage, pCell) ); assert( sqlite3_mutex_held(pPage->pBt->mutex) ); if( pPage->nOverflow || sz+2>pPage->nFree ){ if( pTemp ){ memcpy(pTemp+nSkip, pCell+nSkip, sz-nSkip); pCell = pTemp; } if( iChild ){ put4byte(pCell, iChild); } j = pPage->nOverflow++; assert( j<(int)(sizeof(pPage->aOvfl)/sizeof(pPage->aOvfl[0])) ); pPage->aOvfl[j].pCell = pCell; pPage->aOvfl[j].idx = (u16)i; }else{ int rc = sqlite3PagerWrite(pPage->pDbPage); if( rc!=SQLITE_OK ){ ................................................................................ idx = allocateSpace(pPage, sz); assert( idx>0 ); assert( end <= get2byte(&data[hdr+5]) ); if (idx+sz > pPage->pBt->usableSize) { return SQLITE_CORRUPT_BKPT; } pPage->nCell++; pPage->nFree = pPage->nFree - (u16)(2 + sz); memcpy(&data[idx+nSkip], pCell+nSkip, sz-nSkip); if( iChild ){ put4byte(&data[idx], iChild); } for(j=end-2, ptr=&data[j]; j>ins; j-=2, ptr-=2){ ptr[0] = ptr[-2]; ptr[1] = ptr[-1]; } put2byte(&data[ins], idx); put2byte(&data[hdr+3], pPage->nCell); #ifndef SQLITE_OMIT_AUTOVACUUM if( pPage->pBt->autoVacuum ){ /* The cell may contain a pointer to an overflow page. If so, write ** the entry for the overflow page into the pointer map. */ return ptrmapPutOvflPtr(pPage, pCell); } #endif } return SQLITE_OK; } ................................................................................ ** cell that will be inserted into pParent. Such a cell consists of a 4 ** byte page number followed by a variable length integer. In other ** words, at most 13 bytes. Hence the pSpace buffer must be at ** least 13 bytes in size. */ static int balance_quick(MemPage *pParent, MemPage *pPage, u8 *pSpace){ BtShared *const pBt = pPage->pBt; /* B-Tree Database */ MemPage *pNew; /* Newly allocated page */ int rc; /* Return Code */ Pgno pgnoNew; /* Page number of pNew */ assert( sqlite3_mutex_held(pPage->pBt->mutex) ); assert( sqlite3PagerIswriteable(pParent->pDbPage) ); assert( pPage->nOverflow==1 ); ................................................................................ if( pPage->nCell<=0 ) return SQLITE_CORRUPT_BKPT; /* Allocate a new page. This page will become the right-sibling of ** pPage. Make the parent page writable, so that the new divider cell ** may be inserted. If both these operations are successful, proceed. */ rc = allocateBtreePage(pBt, &pNew, &pgnoNew, 0, 0); if( rc==SQLITE_OK ){ u8 *pOut = &pSpace[4]; u8 *pCell = pPage->aOvfl[0].pCell; u16 szCell = cellSizePtr(pPage, pCell); u8 *pStop; assert( sqlite3PagerIswriteable(pNew->pDbPage) ); assert( pPage->aData[0]==(PTF_INTKEY|PTF_LEAFDATA|PTF_LEAF) ); zeroPage(pNew, PTF_INTKEY|PTF_LEAFDATA|PTF_LEAF); assemblePage(pNew, 1, &pCell, &szCell); /* If this is an auto-vacuum database, update the pointer map ** with entries for the new page, and any pointer from the ** cell on the page to an overflow page. If either of these ** operations fails, the return code is set, but the contents ** of the parent page are still manipulated by thh code below. ** That is Ok, at this point the parent page is guaranteed to ** be marked as dirty. Returning an error code will cause a ** rollback, undoing any changes made to the parent page. */ if( ISAUTOVACUUM ){ rc = ptrmapPut(pBt, pgnoNew, PTRMAP_BTREE, pParent->pgno); if( szCell>pNew->minLocal && rc==SQLITE_OK ){ rc = ptrmapPutOvflPtr(pNew, pCell); } } /* Create a divider cell to insert into pParent. The divider cell ** consists of a 4-byte page number (the page number of pPage) and ** a variable length key value (which must be the same value as the ** largest key on pPage). ** ** To find the largest key value on pPage, first find the right-most ................................................................................ ** cell on pPage. The first two fields of this cell are the ** record-length (a variable length integer at most 32-bits in size) ** and the key value (a variable length integer, may have any value). ** The first of the while(...) loops below skips over the record-length ** field. The second while(...) loop copies the key value from the ** cell on pPage into the pSpace buffer. */ pCell = findCell(pPage, pPage->nCell-1); pStop = &pCell[9]; while( (*(pCell++)&0x80) && pCell<pStop ); pStop = &pCell[9]; while( ((*(pOut++) = *(pCell++))&0x80) && pCell<pStop ); /* Insert the new divider cell into pParent. */ insertCell(pParent,pParent->nCell,pSpace,(int)(pOut-pSpace),0,pPage->pgno); /* Set the right-child pointer of pParent to point to the new page. */ put4byte(&pParent->aData[pParent->hdrOffset+8], pgnoNew); /* Release the reference to the new page. */ releasePage(pNew); } return rc; } #endif /* SQLITE_OMIT_QUICKBALANCE */ #if 0 /* ** This function does not contribute anything to the operation of SQLite. ** it is sometimes activated temporarily while debugging code responsible ** for setting pointer-map entries. */ static int ptrmapCheckPages(MemPage **apPage, int nPage){ int i, j; for(i=0; i<nPage; i++){ Pgno n; u8 e; MemPage *pPage = apPage[i]; BtShared *pBt = pPage->pBt; assert( pPage->isInit ); for(j=0; j<pPage->nCell; j++){ CellInfo info; u8 *z; z = findCell(pPage, j); sqlite3BtreeParseCellPtr(pPage, z, &info); if( info.iOverflow ){ Pgno ovfl = get4byte(&z[info.iOverflow]); ptrmapGet(pBt, ovfl, &e, &n); assert( n==pPage->pgno && e==PTRMAP_OVERFLOW1 ); } if( !pPage->leaf ){ Pgno child = get4byte(z); ptrmapGet(pBt, child, &e, &n); assert( n==pPage->pgno && e==PTRMAP_BTREE ); } } if( !pPage->leaf ){ Pgno child = get4byte(&pPage->aData[pPage->hdrOffset+8]); ptrmapGet(pBt, child, &e, &n); assert( n==pPage->pgno && e==PTRMAP_BTREE ); } } return 1; } #endif /* ** This function is used to copy the contents of the b-tree node stored ** on page pFrom to page pTo. If page pFrom was not a leaf page, then ** the pointer-map entries for each child page are updated so that the ** parent page stored in the pointer map is page pTo. If pFrom contained ** any cells with overflow page pointers, then the corresponding pointer ** map entries are also updated so that the parent page is page pTo. ** ** If pFrom is currently carrying any overflow cells (entries in the ** MemPage.aOvfl[] array), they are not copied to pTo. ** ** Before returning, page pTo is reinitialized using sqlite3BtreeInitPage(). ** ** The performance of this function is not critical. It is only used by ** the balance_shallower() and balance_deeper() procedures, neither of ** which are called often under normal circumstances. */ static int copyNodeContent(MemPage *pFrom, MemPage *pTo){ BtShared * const pBt = pFrom->pBt; u8 * const aFrom = pFrom->aData; u8 * const aTo = pTo->aData; int const iFromHdr = pFrom->hdrOffset; int const iToHdr = ((pTo->pgno==1) ? 100 : 0); int rc = SQLITE_OK; int iData; assert( pFrom->isInit ); assert( pFrom->nFree>=iToHdr ); assert( get2byte(&aFrom[iFromHdr+5])<=pBt->usableSize ); /* Copy the b-tree node content from page pFrom to page pTo. */ iData = get2byte(&aFrom[iFromHdr+5]); memcpy(&aTo[iData], &aFrom[iData], pBt->usableSize-iData); memcpy(&aTo[iToHdr], &aFrom[iFromHdr], pFrom->cellOffset + 2*pFrom->nCell); /* Reinitialize page pTo so that the contents of the MemPage structure ** match the new data. The initialization of pTo "cannot" fail, as the ** data copied from pFrom is known to be valid. */ pTo->isInit = 0; TESTONLY(rc = ) sqlite3BtreeInitPage(pTo); assert( rc==SQLITE_OK ); /* If this is an auto-vacuum database, update the pointer-map entries ** for any b-tree or overflow pages that pTo now contains the pointers to. */ if( ISAUTOVACUUM ){ rc = setChildPtrmaps(pTo); } return rc; } /* ** This routine redistributes cells on the iParentIdx'th child of pParent ** (hereafter "the page") and up to 2 siblings so that all pages have about the ** same amount of free space. Usually a single sibling on either side of the ** page are used in the balancing, though both siblings might come from one ** side if the page is the first or last child of its parent. If the page ** has fewer than 2 siblings (something which can only happen if the page ** is a root page or a child of a root page) then all available siblings ** participate in the balancing. ** ** The number of siblings of the page might be increased or decreased by ** one or two in an effort to keep pages nearly full but not over full. ** ** Note that when this routine is called, some of the cells on the page ** might not actually be stored in MemPage.aData[]. This can happen ** if the page is overfull. This routine ensures that all cells allocated ** to the page and its siblings fit into MemPage.aData[] before returning. ** ** In the course of balancing the page and its siblings, cells may be ** inserted into or removed from the parent page (pParent). Doing so ** may cause the parent page to become overfull or underfull. If this ** happens, it is the responsibility of the caller to invoke the correct ** balancing routine to fix this problem (see the balance() routine). ** ** If this routine fails for any reason, it might leave the database ** in a corrupted state. So if this routine fails, the database should ** be rolled back. ** ** The third argument to this function, aOvflSpace, is a pointer to a ** buffer page-size bytes in size. If, in inserting cells into the parent ** page (pParent), the parent page becomes overfull, this buffer is ** used to store the parents overflow cells. Because this function inserts ** a maximum of four divider cells into the parent page, and the maximum ** size of a cell stored within an internal node is always less than 1/4 ** of the page-size, the aOvflSpace[] buffer is guaranteed to be large ** enough for all overflow cells. ** ** If aOvflSpace is set to a null pointer, this function returns ** SQLITE_NOMEM. */ static int balance_nonroot( MemPage *pParent, /* Parent page of siblings being balanced */ int iParentIdx, /* Index of "the page" in pParent */ u8 *aOvflSpace, /* page-size bytes of space for parent ovfl */ int isRoot /* True if pParent is a root-page */ ){ BtShared *pBt; /* The whole database */ int nCell = 0; /* Number of cells in apCell[] */ int nMaxCells = 0; /* Allocated size of apCell, szCell, aFrom. */ int nNew = 0; /* Number of pages in apNew[] */ int nOld; /* Number of pages in apOld[] */ int i, j, k; /* Loop counters */ int nxDiv; /* Next divider slot in pParent->aCell[] */ int rc = SQLITE_OK; /* The return code */ u16 leafCorrection; /* 4 if pPage is a leaf. 0 if not */ int leafData; /* True if pPage is a leaf of a LEAFDATA tree */ int usableSpace; /* Bytes in pPage beyond the header */ int pageFlags; /* Value of pPage->aData[0] */ int subtotal; /* Subtotal of bytes in cells on one page */ int iSpace1 = 0; /* First unused byte of aSpace1[] */ int iOvflSpace = 0; /* First unused byte of aOvflSpace[] */ int szScratch; /* Size of scratch memory requested */ MemPage *apOld[NB]; /* pPage and up to two siblings */ MemPage *apCopy[NB]; /* Private copies of apOld[] pages */ MemPage *apNew[NB+2]; /* pPage and up to NB siblings after balancing */ u8 *pRight; /* Location in parent of right-sibling pointer */ u8 *apDiv[NB-1]; /* Divider cells in pParent */ int cntNew[NB+2]; /* Index in aCell[] of cell after i-th page */ int szNew[NB+2]; /* Combined size of cells place on i-th page */ u8 **apCell = 0; /* All cells begin balanced */ u16 *szCell; /* Local size of all cells in apCell[] */ u8 *aSpace1; /* Space for copies of dividers cells */ Pgno pgno; /* Temp var to store a page number in */ pBt = pParent->pBt; assert( sqlite3_mutex_held(pBt->mutex) ); assert( sqlite3PagerIswriteable(pParent->pDbPage) ); #if 0 TRACE(("BALANCE: begin page %d child of %d\n", pPage->pgno, pParent->pgno)); #endif /* At this point pParent may have at most one overflow cell. And if ** this overflow cell is present, it must be the cell with ** index iParentIdx. This scenario comes about when this function ** is called (indirectly) from sqlite3BtreeDelete(). */ assert( pParent->nOverflow==0 || pParent->nOverflow==1 ); assert( pParent->nOverflow==0 || pParent->aOvfl[0].idx==iParentIdx ); if( !aOvflSpace ){ return SQLITE_NOMEM; } /* Find the sibling pages to balance. Also locate the cells in pParent ** that divide the siblings. An attempt is made to find NN siblings on ** either side of pPage. More siblings are taken from one side, however, ** if there are fewer than NN siblings on the other side. If pParent ** has NB or fewer children then all children of pParent are taken. ** ** This loop also drops the divider cells from the parent page. This ** way, the remainder of the function does not have to deal with any ** overflow cells in the parent page, as if one existed it has already ** been removed. */ i = pParent->nOverflow + pParent->nCell; if( i<2 ){ nxDiv = 0; nOld = i+1; }else{ nOld = 3; if( iParentIdx==0 ){ nxDiv = 0; }else if( iParentIdx==i ){ nxDiv = i-2; }else{ nxDiv = iParentIdx-1; } i = 2; } if( (i+nxDiv-pParent->nOverflow)==pParent->nCell ){ pRight = &pParent->aData[pParent->hdrOffset+8]; }else{ pRight = findCell(pParent, i+nxDiv-pParent->nOverflow); } pgno = get4byte(pRight); while( 1 ){ rc = getAndInitPage(pBt, pgno, &apOld[i]); if( rc ){ memset(apOld, 0, i*sizeof(MemPage*)); goto balance_cleanup; } nMaxCells += 1+apOld[i]->nCell+apOld[i]->nOverflow; if( (i--)==0 ) break; if( pParent->nOverflow && i+nxDiv==pParent->aOvfl[0].idx ){ apDiv[i] = pParent->aOvfl[0].pCell; pgno = get4byte(apDiv[i]); szNew[i] = cellSizePtr(pParent, apDiv[i]); pParent->nOverflow = 0; }else{ apDiv[i] = findCell(pParent, i+nxDiv-pParent->nOverflow); pgno = get4byte(apDiv[i]); szNew[i] = cellSizePtr(pParent, apDiv[i]); /* Drop the cell from the parent page. apDiv[i] still points to ** the cell within the parent, even though it has been dropped. ** This is safe because dropping a cell only overwrites the first ** four bytes of it, and this function does not need the first ** four bytes of the divider cell. So the pointer is safe to use ** later on. ** ** Unless SQLite is compiled in secure-delete mode. In this case, ** the dropCell() routine will overwrite the entire cell with zeroes. ** In this case, temporarily copy the cell into the aOvflSpace[] ** buffer. It will be copied out again as soon as the aSpace[] buffer ** is allocated. */ #ifdef SQLITE_SECURE_DELETE memcpy(&aOvflSpace[apDiv[i]-pParent->aData], apDiv[i], szNew[i]); apDiv[i] = &aOvflSpace[apDiv[i]-pParent->aData]; #endif dropCell(pParent, i+nxDiv-pParent->nOverflow, szNew[i]); } } /* Make nMaxCells a multiple of 4 in order to preserve 8-byte ** alignment */ nMaxCells = (nMaxCells + 3)&~3; /* ** Allocate space for memory structures */ k = pBt->pageSize + ROUND8(sizeof(MemPage)); szScratch = nMaxCells*sizeof(u8*) /* apCell */ + nMaxCells*sizeof(u16) /* szCell */ + pBt->pageSize /* aSpace1 */ + k*nOld; /* Page copies (apCopy) */ apCell = sqlite3ScratchMalloc( szScratch ); if( apCell==0 ){ rc = SQLITE_NOMEM; goto balance_cleanup; } szCell = (u16*)&apCell[nMaxCells]; aSpace1 = (u8*)&szCell[nMaxCells]; assert( EIGHT_BYTE_ALIGNMENT(aSpace1) ); /* ** Load pointers to all cells on sibling pages and the divider cells ** into the local apCell[] array. Make copies of the divider cells ** into space obtained from aSpace1[] and remove the the divider Cells ** from pParent. ** ** If the siblings are on leaf pages, then the child pointers of the ** divider cells are stripped from the cells before they are copied ** into aSpace1[]. In this way, all cells in apCell[] are without ** child pointers. If siblings are not leaves, then all cell in ** apCell[] include child pointers. Either way, all cells in apCell[] ** are alike. ** ** leafCorrection: 4 if pPage is a leaf. 0 if pPage is not a leaf. ** leafData: 1 if pPage holds key+data and pParent holds only keys. */ leafCorrection = apOld[0]->leaf*4; leafData = apOld[0]->hasData; for(i=0; i<nOld; i++){ int limit; /* Before doing anything else, take a copy of the i'th original sibling ** The rest of this function will use data from the copies rather ** that the original pages since the original pages will be in the ** process of being overwritten. */ MemPage *pOld = apCopy[i] = (MemPage*)&aSpace1[pBt->pageSize + k*i]; memcpy(pOld, apOld[i], sizeof(MemPage)); pOld->aData = (void*)&pOld[1]; memcpy(pOld->aData, apOld[i]->aData, pBt->pageSize); limit = pOld->nCell+pOld->nOverflow; for(j=0; j<limit; j++){ assert( nCell<nMaxCells ); apCell[nCell] = findOverflowCell(pOld, j); szCell[nCell] = cellSizePtr(pOld, apCell[nCell]); nCell++; } if( i<nOld-1 && !leafData){ u16 sz = (u16)szNew[i]; u8 *pTemp; assert( nCell<nMaxCells ); szCell[nCell] = sz; pTemp = &aSpace1[iSpace1]; iSpace1 += sz; assert( sz<=pBt->pageSize/4 ); assert( iSpace1<=pBt->pageSize ); memcpy(pTemp, apDiv[i], sz); apCell[nCell] = pTemp+leafCorrection; assert( leafCorrection==0 || leafCorrection==4 ); szCell[nCell] = szCell[nCell] - leafCorrection; if( !pOld->leaf ){ assert( leafCorrection==0 ); assert( pOld->hdrOffset==0 ); /* The right pointer of the child page pOld becomes the left ** pointer of the divider cell */ memcpy(apCell[nCell], &pOld->aData[8], 4); }else{ assert( leafCorrection==4 ); if( szCell[nCell]<4 ){ /* Do not allow any cells smaller than 4 bytes. */ szCell[nCell] = 4; } } nCell++; } } /* ** Figure out the number of pages needed to hold all nCell cells. ** Store this number in "k". Also compute szNew[] which is the total ** size of all cells on the i-th page and cntNew[] which is the index ................................................................................ /* Either we found one or more cells (cntnew[0])>0) or pPage is ** a virtual root page. A virtual root page is when the real root ** page is page 1 and we are the only child of that page. */ assert( cntNew[0]>0 || (pParent->pgno==1 && pParent->nCell==0) ); TRACE(("BALANCE: old: %d %d %d ", apOld[0]->pgno, nOld>=2 ? apOld[1]->pgno : 0, nOld>=3 ? apOld[2]->pgno : 0 )); /* ** Allocate k new pages. Reuse old pages where possible. */ if( apOld[0]->pgno<=1 ){ rc = SQLITE_CORRUPT; goto balance_cleanup; } pageFlags = apOld[0]->aData[0]; for(i=0; i<k; i++){ MemPage *pNew; if( i<nOld ){ pNew = apNew[i] = apOld[i]; apOld[i] = 0; rc = sqlite3PagerWrite(pNew->pDbPage); nNew++; if( rc ) goto balance_cleanup; }else{ assert( i>0 ); rc = allocateBtreePage(pBt, &pNew, &pgno, pgno, 0); if( rc ) goto balance_cleanup; apNew[i] = pNew; nNew++; /* Set the pointer-map entry for the new sibling page. */ if( ISAUTOVACUUM ){ rc = ptrmapPut(pBt, pNew->pgno, PTRMAP_BTREE, pParent->pgno); if( rc!=SQLITE_OK ){ goto balance_cleanup; } } } } /* Free any old pages that were not reused as new pages. */ while( i<nOld ){ rc = freePage(apOld[i]); ................................................................................ ** n is never more than NB (a small constant), that should ** not be a problem. ** ** When NB==3, this one optimization makes the database ** about 25% faster for large insertions and deletions. */ for(i=0; i<k-1; i++){ int minV = apNew[i]->pgno; int minI = i; for(j=i+1; j<k; j++){ if( apNew[j]->pgno<(unsigned)minV ){ minI = j; minV = apNew[j]->pgno; } } if( minI>i ){ int t; MemPage *pT; t = apNew[i]->pgno; pT = apNew[i]; apNew[i] = apNew[minI]; apNew[minI] = pT; } } TRACE(("new: %d(%d) %d(%d) %d(%d) %d(%d) %d(%d)\n", apNew[0]->pgno, szNew[0], nNew>=2 ? apNew[1]->pgno : 0, nNew>=2 ? szNew[1] : 0, nNew>=3 ? apNew[2]->pgno : 0, nNew>=3 ? szNew[2] : 0, nNew>=4 ? apNew[3]->pgno : 0, nNew>=4 ? szNew[3] : 0, nNew>=5 ? apNew[4]->pgno : 0, nNew>=5 ? szNew[4] : 0)); assert( sqlite3PagerIswriteable(pParent->pDbPage) ); put4byte(pRight, apNew[nNew-1]->pgno); /* ** Evenly distribute the data in apCell[] across the new pages. ** Insert divider cells into pParent as necessary. */ j = 0; for(i=0; i<nNew; i++){ /* Assemble the new sibling page. */ MemPage *pNew = apNew[i]; assert( j<nMaxCells ); zeroPage(pNew, pageFlags); assemblePage(pNew, cntNew[i]-j, &apCell[j], &szCell[j]); assert( pNew->nCell>0 || (nNew==1 && cntNew[0]==0) ); assert( pNew->nOverflow==0 ); j = cntNew[i]; /* If the sibling page assembled above was not the right-most sibling, ** insert a divider cell into the parent page. */ assert( i<nNew-1 || j==nCell ); if( j<nCell ){ u8 *pCell; u8 *pTemp; int sz; assert( j<nMaxCells ); pCell = apCell[j]; sz = szCell[j] + leafCorrection; pTemp = &aOvflSpace[iOvflSpace]; if( !pNew->leaf ){ memcpy(&pNew->aData[8], pCell, 4); }else if( leafData ){ /* If the tree is a leaf-data tree, and the siblings are leaves, ** then there is no divider cell in apCell[]. Instead, the divider ** cell consists of the integer key for the right-most cell of ** the sibling-page assembled above only. */ CellInfo info; j--; sqlite3BtreeParseCellPtr(pNew, apCell[j], &info); pCell = pTemp; sz = 4 + putVarint(&pCell[4], info.nKey); pTemp = 0; }else{ pCell -= 4; /* Obscure case for non-leaf-data trees: If the cell at pCell was ** previously stored on a leaf node, and its reported size was 4 ** bytes, then it may actually be smaller than this ** (see sqlite3BtreeParseCellPtr(), 4 bytes is the minimum size of ................................................................................ assert(leafCorrection==4); sz = cellSizePtr(pParent, pCell); } } iOvflSpace += sz; assert( sz<=pBt->pageSize/4 ); assert( iOvflSpace<=pBt->pageSize ); rc = insertCell(pParent, nxDiv, pCell, sz, pTemp, pNew->pgno); if( rc!=SQLITE_OK ) goto balance_cleanup; assert( sqlite3PagerIswriteable(pParent->pDbPage) ); j++; nxDiv++; } } assert( j==nCell ); assert( nOld>0 ); assert( nNew>0 ); if( (pageFlags & PTF_LEAF)==0 ){ u8 *zChild = &apCopy[nOld-1]->aData[8]; memcpy(&apNew[nNew-1]->aData[8], zChild, 4); } if( isRoot && pParent->nCell==0 && pParent->hdrOffset<=apNew[0]->nFree ){ /* The root page of the b-tree now contains no cells. The only sibling ** page is the right-child of the parent. Copy the contents of the ** child page into the parent, decreasing the overall height of the ** b-tree structure by one. This is described as the "balance-shallower" ** sub-algorithm in some documentation. ** ** If this is an auto-vacuum database, the call to copyNodeContent() ** sets all pointer-map entries corresponding to database image pages ** for which the pointer is stored within the content being copied. ** ** The second assert below verifies that the child page is defragmented ** (it must be, as it was just reconstructed using assemblePage()). This ** is important if the parent page happens to be page 1 of the database ** image. */ assert( nNew==1 ); assert( apNew[0]->nFree == (get2byte(&apNew[0]->aData[5])-apNew[0]->cellOffset-apNew[0]->nCell*2) ); if( SQLITE_OK==(rc = copyNodeContent(apNew[0], pParent)) ){ rc = freePage(apNew[0]); } }else if( ISAUTOVACUUM ){ /* Fix the pointer-map entries for all the cells that were shifted around. ** There are several different types of pointer-map entries that need to ** be dealt with by this routine. Some of these have been set already, but ** many have not. The following is a summary: ** ** 1) The entries associated with new sibling pages that were not ** siblings when this function was called. These have already ** been set. We don't need to worry about old siblings that were ** moved to the free-list - the freePage() code has taken care ** of those. ** ** 2) The pointer-map entries associated with the first overflow ** page in any overflow chains used by new divider cells. These ** have also already been taken care of by the insertCell() code. ** ** 3) If the sibling pages are not leaves, then the child pages of ** cells stored on the sibling pages may need to be updated. ** ** 4) If the sibling pages are not internal intkey nodes, then any ** overflow pages used by these cells may need to be updated ** (internal intkey nodes never contain pointers to overflow pages). ** ** 5) If the sibling pages are not leaves, then the pointer-map ** entries for the right-child pages of each sibling may need ** to be updated. ** ** Cases 1 and 2 are dealt with above by other code. The next ** block deals with cases 3 and 4 and the one after that, case 5. Since ** setting a pointer map entry is a relatively expensive operation, this ** code only sets pointer map entries for child or overflow pages that have ** actually moved between pages. */ MemPage *pNew = apNew[0]; MemPage *pOld = apCopy[0]; int nOverflow = pOld->nOverflow; int iNextOld = pOld->nCell + nOverflow; int iOverflow = (nOverflow ? pOld->aOvfl[0].idx : -1); j = 0; /* Current 'old' sibling page */ k = 0; /* Current 'new' sibling page */ for(i=0; i<nCell && rc==SQLITE_OK; i++){ int isDivider = 0; while( i==iNextOld ){ /* Cell i is the cell immediately following the last cell on old ** sibling page j. If the siblings are not leaf pages of an ** intkey b-tree, then cell i was a divider cell. */ pOld = apCopy[++j]; iNextOld = i + !leafData + pOld->nCell + pOld->nOverflow; if( pOld->nOverflow ){ nOverflow = pOld->nOverflow; iOverflow = i + !leafData + pOld->aOvfl[0].idx; } isDivider = !leafData; } assert(nOverflow>0 || iOverflow<i ); assert(nOverflow<2 || pOld->aOvfl[0].idx==pOld->aOvfl[1].idx-1); assert(nOverflow<3 || pOld->aOvfl[1].idx==pOld->aOvfl[2].idx-1); if( i==iOverflow ){ isDivider = 1; if( (--nOverflow)>0 ){ iOverflow++; } } if( i==cntNew[k] ){ /* Cell i is the cell immediately following the last cell on new ** sibling page k. If the siblings are not leaf pages of an ** intkey b-tree, then cell i is a divider cell. */ pNew = apNew[++k]; if( !leafData ) continue; } assert( rc==SQLITE_OK ); assert( j<nOld ); assert( k<nNew ); /* If the cell was originally divider cell (and is not now) or ** an overflow cell, or if the cell was located on a different sibling ** page before the balancing, then the pointer map entries associated ** with any child or overflow pages need to be updated. */ if( isDivider || pOld->pgno!=pNew->pgno ){ if( !leafCorrection ){ rc = ptrmapPut(pBt, get4byte(apCell[i]), PTRMAP_BTREE, pNew->pgno); } if( szCell[i]>pNew->minLocal && rc==SQLITE_OK ){ rc = ptrmapPutOvflPtr(pNew, apCell[i]); } } } if( !leafCorrection ){ for(i=0; rc==SQLITE_OK && i<nNew; i++){ rc = ptrmapPut( pBt, get4byte(&apNew[i]->aData[8]), PTRMAP_BTREE, apNew[i]->pgno); } } #if 0 /* The ptrmapCheckPages() contains assert() statements that verify that ** all pointer map pages are set correctly. This is helpful while ** debugging. This is usually disabled because a corrupt database may ** cause an assert() statement to fail. */ ptrmapCheckPages(apNew, nNew); ptrmapCheckPages(&pParent, 1); #endif } assert( pParent->isInit ); TRACE(("BALANCE: finished: old=%d new=%d cells=%d\n", nOld, nNew, nCell)); /* ** Cleanup before returning. */ balance_cleanup: sqlite3ScratchFree(apCell); for(i=0; i<nOld; i++){ releasePage(apOld[i]); } for(i=0; i<nNew; i++){ releasePage(apNew[i]); } return rc; } /* ** This function is called when the root page of a b-tree structure is ** overfull (has one or more overflow pages). ................................................................................ /* ** The page that pCur currently points to has just been modified in ** some way. This function figures out if this modification means the ** tree needs to be balanced, and if so calls the appropriate balancing ** routine. Balancing routines are: ** ** balance_quick() ** balance_deeper() ** balance_nonroot() */ static int balance(BtCursor *pCur){ int rc = SQLITE_OK; const int nMin = pCur->pBt->usableSize * 2 / 3; u8 aBalanceQuickSpace[13]; u8 *pFree = 0; ................................................................................ rc = balance_deeper(pPage, &pCur->apPage[1]); if( rc==SQLITE_OK ){ pCur->iPage = 1; pCur->aiIdx[0] = 0; pCur->aiIdx[1] = 0; assert( pCur->apPage[1]->nOverflow ); } }else{ break; } }else if( pPage->nOverflow==0 && pPage->nFree<=nMin ){ break; }else{ MemPage * const pParent = pCur->apPage[iPage-1]; int const iIdx = pCur->aiIdx[iPage-1]; ................................................................................ ** different page). Once this subsequent call to balance_nonroot() ** has completed, it is safe to release the pSpace buffer used by ** the previous call, as the overflow cell data will have been ** copied either into the body of a database page or into the new ** pSpace buffer passed to the latter call to balance_nonroot(). */ u8 *pSpace = sqlite3PageMalloc(pCur->pBt->pageSize); rc = balance_nonroot(pParent, iIdx, pSpace, iPage==1); if( pFree ){ /* If pFree is not NULL, it points to the pSpace buffer used ** by a previous call to balance_nonroot(). Its contents are ** now stored either on real database pages or within the ** new pSpace buffer, so it may be safely freed here. */ sqlite3PageFree(pFree); } /* The pSpace buffer will be freed after the next call to ** balance_nonroot(), or just before this function returns, whichever ** comes first. */ pFree = pSpace; } } pPage->nOverflow = 0; /* The next iteration of the do-loop balances the parent page. */ releasePage(pPage); ................................................................................ */ if( SQLITE_OK!=(rc = saveAllCursors(pBt, pCur->pgnoRoot, pCur)) || (!loc && SQLITE_OK!=(rc = sqlite3BtreeMoveto(pCur, pKey, nKey, appendBias, &loc)) )){ return rc; } assert( pCur->eState==CURSOR_VALID || (pCur->eState==CURSOR_INVALID && loc) ); pPage = pCur->apPage[pCur->iPa |