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#include "UnityPrefix.h"
#include "StackAllocator.h"
#include "Runtime/Allocator/MemoryManager.h"
#include "Runtime/Profiler/MemoryProfiler.h"
StackAllocator::StackAllocator(int blockSize, const char* name)
: BaseAllocator(name)
, m_Block(NULL)
, m_LastAlloc(NULL)
, m_BlockSize(blockSize)
{
#if ENABLE_MEMORY_MANAGER
m_Block = (char*)MemoryManager::LowLevelAllocate(m_BlockSize);
#else
m_Block = (char*)malloc(m_BlockSize);
#endif
m_TotalReservedMemory = blockSize;
}
StackAllocator::~StackAllocator()
{
while(m_LastAlloc)
Deallocate(m_LastAlloc);
#if ENABLE_MEMORY_MANAGER
MemoryManager::LowLevelFree(m_Block);
#else
free(m_Block);
#endif
}
void* StackAllocator::Allocate (size_t size, int align)
{
//1 byte alignment doesn't work for webgl; this is a fix(ish)....
#if UNITY_WEBGL || UNITY_BB10
if(align % 8 != 0)
align = 8;
#endif
size_t alignmask = align - 1;
// make header size a multiple
int alignedHeaderSize = (GetHeaderSize() + alignmask) & ~alignmask;
int paddedSize = (size + alignedHeaderSize + alignmask) & ~alignmask;
char* realPtr;
char* freePtr = (char*)AlignPtr(GetBufferFreePtr(), align);
size_t freeSize = m_BlockSize - (int)(freePtr - m_Block);
if ( InBlock(freePtr) && paddedSize < freeSize )
{
realPtr = freePtr;
}
else
{
// Spilled over. We have to allocate the memory default alloc
realPtr = (char*)UNITY_MALLOC_ALIGNED(kMemTempOverflow, paddedSize, align);
}
if(realPtr == NULL)
return NULL;
char* ptr = realPtr + alignedHeaderSize;
Header* h = ( (Header*)ptr )-1;
h->prevPtr = m_LastAlloc;
h->size = size;
h->deleted = 0;
h->realPtr = realPtr;
m_LastAlloc = ptr;
return ptr;
}
void* StackAllocator::Reallocate (void* p, size_t size, int align)
{
if (p == NULL)
return Allocate(size, align);
char* freePtr = (char*)AlignPtr(GetBufferFreePtr(), align);
size_t freeSize = m_BlockSize - (int)(freePtr - m_Block);
size_t oldSize = GetPtrSize(p);
if ((p == m_LastAlloc || oldSize >= size) && InBlock(p)
&& AlignPtr(p,align) == p
&& oldSize + freeSize > size)
{
// just expand the top allocation of the stack to the realloc amount
Header* h = ( (Header*)p )-1;
h->size = size;
return p;
}
void* newPtr = NULL;
if (!InBlock(p))
{
size_t alignmask = align - 1;
int alignedHeaderSize = (GetHeaderSize() + alignmask) & ~alignmask;
int paddedSize = (size + alignedHeaderSize + alignmask) & ~alignmask;
char* realPtr = (char*)UNITY_REALLOC_ALIGNED(kMemTempOverflow, GetRealPtr(p), paddedSize, align);
if(realPtr == NULL)
return NULL;
newPtr = realPtr + alignedHeaderSize;
Header* h = ( (Header*)newPtr ) - 1;
h->size = size;
h->deleted = 0;
h->realPtr = realPtr;
if(m_LastAlloc == p)
m_LastAlloc = (char*)newPtr;
else
UpdateNextHeader(p, newPtr);
}
else
{
newPtr = Allocate(size, align);
if(newPtr != NULL)
memcpy(newPtr, p, std::min(size, oldSize));
Deallocate(p);
}
return newPtr;
}
void StackAllocator::Deallocate (void* p)
{
if (p == m_LastAlloc){
m_LastAlloc = GetPrevAlloc(p);
if ( !InBlock(p) )
{
UNITY_FREE(kMemTempOverflow, GetRealPtr(p));
}
if (IsDeleted(m_LastAlloc))
Deallocate(m_LastAlloc);
}
else
{
SetDeleted(p);
}
}
bool StackAllocator::ContainsInternal (const void* p)
{
// if no temp allocations (should hit here most often)
if (m_LastAlloc == NULL)
return false;
// test inblock
if (InBlock(p))
return true;
// test overflow allocations (should almost never happen)
void* ptr = m_LastAlloc;
while (ptr != NULL && !InBlock(ptr))
{
if (p == ptr)
return true;
ptr = GetPrevAlloc(ptr);
}
return false;
}
void StackAllocator::UpdateNextHeader(void* before, void* after)
{
if (before == m_LastAlloc)
return;
void* ptr = m_LastAlloc;
while (ptr != NULL && !InBlock(ptr))
{
void* prevAlloc = GetPrevAlloc(ptr);
if (before == prevAlloc)
{
Header* h = ((Header*)ptr)-1;
h->prevPtr = (char*)after;
return;
}
ptr = prevAlloc;
}
FatalErrorString("Allocation no found in temp allocation list");
}
size_t StackAllocator::GetAllocatedMemorySize() const
{
int total = 0;
void* ptr = m_LastAlloc;
while (ptr != NULL)
{
total += GetPtrSize(ptr);
ptr = GetPrevAlloc(ptr);
}
return total;
}
size_t StackAllocator::GetAllocatorSizeTotalUsed() const
{
int total = 0;
void* ptr = m_LastAlloc;
while (ptr != NULL)
{
total += GetPtrSize(ptr)+GetHeaderSize();
ptr = GetPrevAlloc(ptr);
}
return total;
}
size_t StackAllocator::GetReservedSizeTotal() const
{
return m_TotalReservedMemory;
}
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