//-----------------------------------------------------------------
void* StackMemoryManager::growObject( size_t amount )
{
size_t currentSize = getTopObjectSize();
size_t newSize = currentSize + amount;
size_t oldCurrentPos = mFrames[ mActiveFrame ].mCurrentPosition;
size_t newDataSizePos = (mFrames[ mActiveFrame ].mCurrentPosition + amount) - sizeof(newSize);
size_t newCurrentPos = newDataSizePos + sizeof(newSize);
if ( newCurrentPos > mFrames[ mActiveFrame ].mMaxMemoryBlob )
{
size_t numOfAllocs = 0;
while ( newCurrentPos > mFrames[ mActiveFrame ].mMaxMemoryBlob )
{
if (!allocateMoreMemory())
return 0;
newDataSizePos = mFrames[ mActiveFrame ].mCurrentPosition + newSize;
newCurrentPos = newDataSizePos + sizeof(newSize);
numOfAllocs++;
}
void* source = mFrames[ mActiveFrame-numOfAllocs ].mMemoryBlob + oldCurrentPos - currentSize - sizeof(currentSize);
memcpy(mFrames[ mActiveFrame ].mMemoryBlob, source, currentSize);
// delete last object in last frame
mFrames[ mActiveFrame-numOfAllocs ].mCurrentPosition -= ( currentSize + sizeof(mFrames[ mActiveFrame-numOfAllocs ].mCurrentPosition) );
}
mFrames[ mActiveFrame ].mCurrentPosition = newCurrentPos;
writeNewObjectSize(newDataSizePos, newSize);
return top();
}
//-----------------------------------------------------------------
void StackMemoryManager::growObject( size_t amount )
{
size_t currentSize = getTopObjectSize();
size_t newSize = currentSize + amount;
size_t newDataSizePos = mCurrentPosition + newSize;
mCurrentPosition = newDataSizePos + sizeof(newSize);
// TODO check if new size exceeds allocated memory !!!
writeNewObjectSize(newDataSizePos, newSize);
}
//--------------------------------------------------------------------
void StackMemoryManager::deleteObject()
{
mFrames[ mActiveFrame ].mCurrentPosition -= ( getTopObjectSize() + sizeof(mFrames[ mActiveFrame ].mCurrentPosition) );
while ( mFrames[ mActiveFrame ].mCurrentPosition == 0 && mActiveFrame != 0 )
{
delete[] mFrames[ mActiveFrame ].mMemoryBlob;
mFrames[ mActiveFrame-- ].mMemoryBlob = 0;
}
}
//--------------------------------------------------------------------
void StackMemoryManager::deleteObject()
{
//mCurrentPosition -= ( (*((size_t*)mMemoryBlob[mCurrentPosition - 1])) + sizeof(mCurrentPosition));
//mCurrentPosition -= ( (*((size_t*)(mMemoryBlob + mCurrentPosition - sizeof(mCurrentPosition)) )) + sizeof(mCurrentPosition));
mCurrentPosition -= ( getTopObjectSize() + sizeof(mCurrentPosition) );
}
//-----------------------------------------------------------------
void* StackMemoryManager::top()
{
return mFrames[ mActiveFrame ].mCurrentPosition != 0 ?
(void*)(mFrames[ mActiveFrame ].mMemoryBlob + mFrames[ mActiveFrame ].mCurrentPosition - getTopObjectSize() - sizeof(mFrames[ mActiveFrame ].mCurrentPosition))
: 0;
}
