memorystack.cpp

#include "prism/memorystack.h"

#include <stdio.h>

#include <prism/memoryhandler.h>

MemoryStack createMemoryStack(uint32_t tSize)
{
	MemoryStack ret;
	ret.mAddress = allocMemory(tSize);
	ret.mSize = tSize;
	ret.mOffset = 0;
	ret.mAmount = 0;
	return ret;
}

void destroyMemoryStack(MemoryStack * tStack)
{
	freeMemory(tStack->mAddress);
}

void resizeMemoryStackToCurrentSize(MemoryStack* tStack) {
	if (tStack->mOffset == tStack->mSize) return;

	tStack->mAddress = reallocMemory(tStack->mAddress, tStack->mOffset);
	tStack->mSize = tStack->mOffset;
}

void * allocMemoryOnMemoryStack(MemoryStack * tStack, uint32_t tSize)
{
	void* ret = (void*)((uintptr_t)tStack->mAddress + tStack->mOffset);
	const auto padding = (4 - (tSize % 4)) % 4;
	tStack->mOffset += tSize + padding;

	tStack->mAmount++;
	return ret;
}

int canFitOnMemoryStack(MemoryStack * tStack, uint32_t tSize)
{
	const auto padding = (4 - (tSize % 4)) % 4;
	return (tStack->mOffset + tSize + padding) <= tStack->mSize;
}