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Overview
| Comment: | Internal enhancements to the native memory allocation wrapper. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
fcac33cc7a08686a894387d963ea3b90 |
| User & Date: | mistachkin 2018-03-08 20:50:47 |
Context
|
2018-03-09
| ||
| 17:25 | Add more tests pursuant to ticket [baf42ee135]. check-in: d1b6742e1e user: mistachkin tags: trunk | |
|
2018-03-08
| ||
| 20:50 | Internal enhancements to the native memory allocation wrapper. check-in: fcac33cc7a user: mistachkin tags: trunk | |
| 18:13 | Prevent GetSchemaTable from throwing InvalidCastException. Fix for [baf42ee135]. check-in: c956230a3c user: mistachkin tags: trunk | |
Changes
Changes to System.Data.SQLite/SQLiteModule.cs.
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///////////////////////////////////////////////////////////////////////
/// <summary>
/// The total number of outstanding memory bytes allocated by this
/// class using the SQLite core library.
/// </summary>
private static int bytesAllocated;
///////////////////////////////////////////////////////////////////////
/// <summary>
/// The maximum number of outstanding memory bytes ever allocated by
/// this class using the SQLite core library.
/// </summary>
private static int maximumBytesAllocated;
#endif
#endregion
///////////////////////////////////////////////////////////////////////
#region Memory Allocation Helper Methods
/// <summary>
/// Allocates at least the specified number of bytes of native memory
/// via the SQLite core library sqlite3_malloc() function and returns
................................................................................
/// not be allocated.
/// </returns>
public static IntPtr Allocate(int size)
{
IntPtr pMemory = UnsafeNativeMethods.sqlite3_malloc(size);
#if TRACK_MEMORY_BYTES
if (pMemory != IntPtr.Zero)
{
int blockSize = Size(pMemory);
if (blockSize > 0)
{
lock (syncRoot)
{
bytesAllocated += blockSize;
if (bytesAllocated > maximumBytesAllocated)
maximumBytesAllocated = bytesAllocated;
}
}
}
#endif
return pMemory;
}
///////////////////////////////////////////////////////////////////////
................................................................................
public static IntPtr AllocateUntracked(int size)
{
return UnsafeNativeMethods.sqlite3_malloc(size);
}
///////////////////////////////////////////////////////////////////////
/// <summary>
/// Gets and returns the actual size of the specified memory block
/// that was previously obtained from the <see cref="Allocate" /> or
/// <see cref="AllocateUntracked" /> methods or directly from the
/// SQLite core library.
/// </summary>
/// <param name="pMemory">
/// The native pointer to the memory block previously obtained from the
/// <see cref="Allocate" /> or <see cref="AllocateUntracked" /> methods
/// or directly from the SQLite core library.
/// </param>
/// <returns>
/// The actual size, in bytes, of the memory block specified via the
/// native pointer.
/// </returns>
public static int Size(IntPtr pMemory)
{
................................................................................
#else
return 0;
#endif
}
///////////////////////////////////////////////////////////////////////
/// <summary>
/// Frees a memory block previously obtained from the
/// <see cref="Allocate" /> method. If the TRACK_MEMORY_BYTES option
/// was enabled at compile-time, adjusts the number of bytes currently
/// allocated by this class.
/// </summary>
/// <param name="pMemory">
/// The native pointer to the memory block previously obtained from the
/// <see cref="Allocate" /> method.
/// </param>
public static void Free(IntPtr pMemory)
{
#if DEBUG
SQLiteMarshal.CheckAlignment("Free", pMemory, 0, IntPtr.Size);
#endif
#if TRACK_MEMORY_BYTES
if (pMemory != IntPtr.Zero)
{
int blockSize = Size(pMemory);
if (blockSize > 0)
{
lock (syncRoot)
{
bytesAllocated -= blockSize;
}
}
}
#endif
UnsafeNativeMethods.sqlite3_free(pMemory);
}
///////////////////////////////////////////////////////////////////////
................................................................................
}
#endregion
///////////////////////////////////////////////////////////////////////
#region Private Methods
#if DEBUG
internal static void CheckAlignment(
string type,
IntPtr pointer,
int offset,
int size
)
{
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///////////////////////////////////////////////////////////////////////
/// <summary>
/// The total number of outstanding memory bytes allocated by this
/// class using the SQLite core library.
/// </summary>
private static ulong bytesAllocated;
///////////////////////////////////////////////////////////////////////
/// <summary>
/// The maximum number of outstanding memory bytes ever allocated by
/// this class using the SQLite core library.
/// </summary>
private static ulong maximumBytesAllocated;
#endif
#endregion
///////////////////////////////////////////////////////////////////////
#region Memory Tracking Helper Methods
#if TRACK_MEMORY_BYTES
/// <summary>
/// Attempts to determine the size of the specified memory block. If
/// the <see cref="Size64" /> method can be used, the returned value
/// may be larger than <see cref="Int32.MaxValue" />. A message may
/// be sent to the logging subsystem if an error is encountered.
/// </summary>
/// <param name="pMemory">
/// The native pointer to the memory block previously obtained from
/// the <see cref="Allocate" />, <see cref="Allocate64" />,
/// <see cref="AllocateUntracked" />, or
/// <see cref="Allocate64Untracked" /> methods or directly from the
/// SQLite core library.
/// </param>
/// <returns>
/// The size of the specified memory block -OR- zero if the 32-bit
/// signed value reported from the native API was less than zero.
/// </returns>
private static ulong GetBlockSize(
IntPtr pMemory
)
{
ulong ulongSize = 0;
if (CanUseSize64())
{
ulongSize = Size64(pMemory);
}
else
{
int intSize = Size(pMemory);
if (intSize > 0)
{
ulongSize = (ulong)intSize;
}
#if DEBUG
else if (intSize < 0)
{
SQLiteLog.LogMessage(SQLiteErrorCode.Warning,
HelperMethods.StringFormat(CultureInfo.CurrentCulture,
"pointer {0} size {1} appears to be negative: {2}",
pMemory, intSize,
#if !PLATFORM_COMPACTFRAMEWORK
Environment.StackTrace
#else
null
#endif
));
}
#endif
}
return ulongSize;
}
///////////////////////////////////////////////////////////////////////
/// <summary>
/// Adjusts the total number of (tracked) bytes that are currently
/// considered to be allocated by this class. The total number is
/// increased by the total size of the memory block pointed to by
/// <paramref name="pMemory" />. If the new total number exceeds
/// the previously seen maximum, the maximum will be reset.
/// </summary>
/// <param name="pMemory">
/// A native pointer to newly allocated memory.
/// </param>
private static void MemoryWasAllocated(
IntPtr pMemory
)
{
if (pMemory != IntPtr.Zero)
{
ulong blockSize = GetBlockSize(pMemory);
if (blockSize > 0)
{
lock (syncRoot)
{
bytesAllocated += blockSize;
if (bytesAllocated > maximumBytesAllocated)
maximumBytesAllocated = bytesAllocated;
}
}
}
}
///////////////////////////////////////////////////////////////////////
/// <summary>
/// Adjusts the total number of (tracked) bytes that are currently
/// considered to be allocated by this class. The total number is
/// decreased by the total size of the memory block pointed to by
/// <paramref name="pMemory" />.
/// </summary>
/// <param name="pMemory">
/// A native pointer to allocated memory that is going to be freed.
/// </param>
private static void MemoryIsBeingFreed(
IntPtr pMemory
)
{
if (pMemory != IntPtr.Zero)
{
ulong blockSize = GetBlockSize(pMemory);
if (blockSize > 0)
{
lock (syncRoot)
{
bytesAllocated -= blockSize;
}
}
}
}
#endif
#endregion
///////////////////////////////////////////////////////////////////////
#region Memory Version Helper Methods
/// <summary>
/// Determines if the native sqlite3_msize() API can be used, based on
/// the available version of the SQLite core library.
/// </summary>
/// <returns>
/// Non-zero if the native sqlite3_msize() API property is supported
/// by the SQLite core library.
/// </returns>
private static bool CanUseSize64()
{
if (UnsafeNativeMethods.sqlite3_libversion_number() >= 3008007)
return true;
return false;
}
#endregion
///////////////////////////////////////////////////////////////////////
#region Memory Allocation Helper Methods
/// <summary>
/// Allocates at least the specified number of bytes of native memory
/// via the SQLite core library sqlite3_malloc() function and returns
................................................................................
/// not be allocated.
/// </returns>
public static IntPtr Allocate(int size)
{
IntPtr pMemory = UnsafeNativeMethods.sqlite3_malloc(size);
#if TRACK_MEMORY_BYTES
MemoryWasAllocated(pMemory);
#endif
return pMemory;
}
///////////////////////////////////////////////////////////////////////
/// <summary>
/// Allocates at least the specified number of bytes of native memory
/// via the SQLite core library sqlite3_malloc64() function and returns
/// the resulting native pointer. If the TRACK_MEMORY_BYTES option
/// was enabled at compile-time, adjusts the number of bytes currently
/// allocated by this class.
/// </summary>
/// <param name="size">
/// The number of bytes to allocate.
/// </param>
/// <returns>
/// The native pointer that points to a block of memory of at least the
/// specified size -OR- <see cref="IntPtr.Zero" /> if the memory could
/// not be allocated.
/// </returns>
public static IntPtr Allocate64(ulong size)
{
IntPtr pMemory = UnsafeNativeMethods.sqlite3_malloc64(size);
#if TRACK_MEMORY_BYTES
MemoryWasAllocated(pMemory);
#endif
return pMemory;
}
///////////////////////////////////////////////////////////////////////
................................................................................
public static IntPtr AllocateUntracked(int size)
{
return UnsafeNativeMethods.sqlite3_malloc(size);
}
///////////////////////////////////////////////////////////////////////
/// <summary>
/// Allocates at least the specified number of bytes of native memory
/// via the SQLite core library sqlite3_malloc64() function and returns
/// the resulting native pointer without adjusting the number of
/// allocated bytes currently tracked by this class. This is useful
/// when dealing with blocks of memory that will be freed directly by
/// the SQLite core library.
/// </summary>
/// <param name="size">
/// The number of bytes to allocate.
/// </param>
/// <returns>
/// The native pointer that points to a block of memory of at least the
/// specified size -OR- <see cref="IntPtr.Zero" /> if the memory could
/// not be allocated.
/// </returns>
public static IntPtr Allocate64Untracked(ulong size)
{
return UnsafeNativeMethods.sqlite3_malloc64(size);
}
///////////////////////////////////////////////////////////////////////
/// <summary>
/// Gets and returns the actual size of the specified memory block
/// that was previously obtained from the <see cref="Allocate" />,
/// <see cref="Allocate64" />, <see cref="AllocateUntracked" />, or
/// <see cref="Allocate64Untracked" /> methods or directly from the
/// SQLite core library.
/// </summary>
/// <param name="pMemory">
/// The native pointer to the memory block previously obtained from
/// the <see cref="Allocate" />, <see cref="Allocate64" />,
/// <see cref="AllocateUntracked" />, or
/// <see cref="Allocate64Untracked" /> methods or directly from the
/// SQLite core library.
/// </param>
/// <returns>
/// The actual size, in bytes, of the memory block specified via the
/// native pointer.
/// </returns>
public static int Size(IntPtr pMemory)
{
................................................................................
#else
return 0;
#endif
}
///////////////////////////////////////////////////////////////////////
/// <summary>
/// Gets and returns the actual size of the specified memory block
/// that was previously obtained from the <see cref="Allocate" />,
/// <see cref="Allocate64" />, <see cref="AllocateUntracked" />, or
/// <see cref="Allocate64Untracked" /> methods or directly from the
/// SQLite core library.
/// </summary>
/// <param name="pMemory">
/// The native pointer to the memory block previously obtained from
/// the <see cref="Allocate" />, <see cref="Allocate64" />,
/// <see cref="AllocateUntracked" />, or
/// <see cref="Allocate64Untracked" /> methods or directly from the
/// SQLite core library.
/// </param>
/// <returns>
/// The actual size, in bytes, of the memory block specified via the
/// native pointer.
/// </returns>
public static ulong Size64(IntPtr pMemory)
{
#if DEBUG
SQLiteMarshal.CheckAlignment("Size64", pMemory, 0, IntPtr.Size);
#endif
return UnsafeNativeMethods.sqlite3_msize(pMemory);
}
///////////////////////////////////////////////////////////////////////
/// <summary>
/// Frees a memory block previously obtained from the
/// <see cref="Allocate" /> or <see cref="Allocate64" /> methods. If
/// the TRACK_MEMORY_BYTES option was enabled at compile-time, adjusts
/// the number of bytes currently allocated by this class.
/// </summary>
/// <param name="pMemory">
/// The native pointer to the memory block previously obtained from the
/// <see cref="Allocate" /> or <see cref="Allocate64" /> methods.
/// </param>
public static void Free(IntPtr pMemory)
{
#if DEBUG
SQLiteMarshal.CheckAlignment("Free", pMemory, 0, IntPtr.Size);
#endif
#if TRACK_MEMORY_BYTES
MemoryIsBeingFreed(pMemory);
#endif
UnsafeNativeMethods.sqlite3_free(pMemory);
}
///////////////////////////////////////////////////////////////////////
................................................................................
}
#endregion
///////////////////////////////////////////////////////////////////////
#region Private Methods
#if DEBUG
/// <summary>
/// Attempts to verify that the specified native pointer is properly
/// aligned for the size of the data value. If that is not the case,
/// a message will be sent to the logging subsystem.
/// </summary>
/// <param name="type">
/// The type of operation being performed by the caller. This value
/// may be used within diagnostic messages.
/// </param>
/// <param name="pointer">
/// The <see cref="IntPtr" /> object instance representing the base
/// memory location.
/// </param>
/// <param name="offset">
/// The integer offset from the base memory location where the data
/// value to be read or written.
/// </param>
/// <param name="size">
/// The size, in bytes, of the data value.
/// </param>
internal static void CheckAlignment(
string type,
IntPtr pointer,
int offset,
int size
)
{
|
Changes to System.Data.SQLite/UnsafeNativeMethods.cs.
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[DllImport(SQLITE_DLL)]
#endif
internal static extern IntPtr sqlite3_malloc(int n);
#if !PLATFORM_COMPACTFRAMEWORK
[DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
[DllImport(SQLITE_DLL)]
#endif
internal static extern IntPtr sqlite3_realloc(IntPtr p, int n);
#if !PLATFORM_COMPACTFRAMEWORK
[DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
[DllImport(SQLITE_DLL)]
#endif
internal static extern void sqlite3_free(IntPtr p);
................................................................................
#if !PLATFORM_COMPACTFRAMEWORK
[DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
[DllImport(SQLITE_DLL)]
#endif
internal static extern IntPtr sqlite3_mprintf(IntPtr format, __arglist);
#endregion
// SQLite API calls that are provided by "well-known" extensions that may be statically
// linked with the SQLite core native library currently in use.
#region extension sqlite api calls
#region virtual table
#if INTEROP_VIRTUAL_TABLE
#if !PLATFORM_COMPACTFRAMEWORK
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[DllImport(SQLITE_DLL)]
#endif
internal static extern IntPtr sqlite3_malloc(int n);
#if !PLATFORM_COMPACTFRAMEWORK
[DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
[DllImport(SQLITE_DLL)]
#endif
internal static extern IntPtr sqlite3_malloc64(ulong n);
#if !PLATFORM_COMPACTFRAMEWORK
[DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
[DllImport(SQLITE_DLL)]
#endif
internal static extern IntPtr sqlite3_realloc(IntPtr p, int n);
#if !PLATFORM_COMPACTFRAMEWORK
[DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
[DllImport(SQLITE_DLL)]
#endif
internal static extern IntPtr sqlite3_realloc64(IntPtr p, ulong n);
#if !PLATFORM_COMPACTFRAMEWORK
[DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
[DllImport(SQLITE_DLL)]
#endif
internal static extern ulong sqlite3_msize(IntPtr p);
#if !PLATFORM_COMPACTFRAMEWORK
[DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
[DllImport(SQLITE_DLL)]
#endif
internal static extern void sqlite3_free(IntPtr p);
................................................................................
#if !PLATFORM_COMPACTFRAMEWORK
[DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
[DllImport(SQLITE_DLL)]
#endif
internal static extern IntPtr sqlite3_mprintf(IntPtr format, __arglist);
#endregion
///////////////////////////////////////////////////////////////////////////
// SQLite API calls that are provided by "well-known" extensions that may be statically
// linked with the SQLite core native library currently in use.
#region extension sqlite api calls
#region virtual table
#if INTEROP_VIRTUAL_TABLE
#if !PLATFORM_COMPACTFRAMEWORK
|