public AbstractBlittableJsonTextWriter(JsonOperationContext context, Stream stream)
{
_context = context;
_stream = stream;
_returnBuffer = context.GetManagedBuffer(out _pinnedBuffer);
_buffer = _pinnedBuffer.Pointer;
_parserAuxiliarMemory = context.GetMemory(32);
}
public void Return(AllocatedMemoryData allocation)
{
if (_isDisposed)
{
return;
}
var address = allocation.Address;
#if DEBUG
Debug.Assert(address != _ptrCurrent);
Debug.Assert(allocation.IsReturned == false);
allocation.IsReturned = true;
#endif
#if MEM_GUARD
#if MEM_GUARD_STACK
if (allocation.FreedBy == null)
{
allocation.FreedBy = Environment.StackTrace;
}
#endif
ElectricFencedMemory.Free(address);
#else
if (address != _ptrCurrent - allocation.SizeInBytes ||
address < _ptrStart)
{
// we have fragmentation, so'll just store the values that we need here
// in the memory we just freed :-)
// note that this fragmentation will be healed by the call to ResetArena
// trying to do this on the fly is too expensive.
Debug.Assert(Bits.NextPowerOf2(allocation.SizeInBytes) == allocation.SizeInBytes,
"Allocation size must always be a power of two"
);
Debug.Assert(allocation.SizeInBytes >= sizeof(FreeSection));
var index = Bits.MostSignificantBit(allocation.SizeInBytes) - 1;
var section = (FreeSection *)address;
section->SizeInBytes = allocation.SizeInBytes;
section->Previous = _freed[index];
_freed[index] = section;
return;
}
// since the returned allocation is at the end of the arena, we can just move
// the pointer back
_used -= allocation.SizeInBytes;
TotalUsed -= allocation.SizeInBytes;
_ptrCurrent -= allocation.SizeInBytes;
#endif
}
public void Reset()
{
_unmanagedWriteBuffer.Dispose();
if (_compressionBuffer != null)
{
_context.ReturnMemory(_compressionBuffer);
_compressionBuffer = null;
}
if (_innerBuffer != null)
{
_context.ReturnMemory(_innerBuffer);
_innerBuffer = null;
}
}
private unsafe byte *GetCompressionBuffer(int minSize)
{
// enlarge buffer if needed
if (_compressionBuffer == null ||
minSize > _compressionBuffer.SizeInBytes)
{
if (_compressionBuffer != null)
{
_context.ReturnMemory(_compressionBuffer);
}
_compressionBuffer = _context.GetMemory(minSize);
}
return(_compressionBuffer.Address);
}
public void Return(AllocatedMemoryData returned)
{
#if MEM_GUARD
ElectricFencedMemory.Free(returned.Address);
GC.SuppressFinalize(returned);
#else
if (returned == null)
{
throw new ArgumentNullException(nameof(returned));
}
var index = GetIndexFromSize(returned.SizeInBytes);
if (index == -1)
{
NativeMemory.Free(returned.Address, returned.SizeInBytes, returned.AllocatingThread);
return; // strange size, just free it
}
_freeSegments[index].Push(returned);
#endif
}
public UnmanagedWriteBuffer(JsonOperationContext context, AllocatedMemoryData allocatedMemoryData)
{
Debug.Assert(context != null);
Debug.Assert(allocatedMemoryData != null);
_context = context;
_head = new Segment
{
Previous = null,
DeallocationPendingPrevious = null,
Allocation = allocatedMemoryData,
Address = allocatedMemoryData.Address,
Used = 0,
AccumulatedSizeInBytes = 0
};
#if MEM_GUARD
AllocatedBy = Environment.StackTrace;
FreedBy = null;
#endif
}
public bool GrowAllocation(AllocatedMemoryData allocation, int sizeIncrease)
{
byte *end = allocation.Address + allocation.SizeInBytes;
var distance = end - _ptrCurrent;
if (distance != 0)
{
return(false);
}
// we need to keep the total allocation size as power of 2
sizeIncrease = Bits.NextPowerOf2(allocation.SizeInBytes + sizeIncrease) - allocation.SizeInBytes;
if (_used + sizeIncrease > _allocated)
{
return(false);
}
_ptrCurrent += sizeIncrease;
_used += sizeIncrease;
TotalUsed += sizeIncrease;
allocation.SizeInBytes += sizeIncrease;
return(true);
}
public BlittableWriter(JsonOperationContext context)
{
_context = context;
_innerBuffer = _context.GetMemory(32);
}
public BlittableWriter(JsonOperationContext context, TWriter writer)
{
_context = context;
_unmanagedWriteBuffer = writer;
_innerBuffer = _context.GetMemory(32);
}
