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#ifndef STACK_ALLOCATOR_H_
#define STACK_ALLOCATOR_H_
#include "BaseAllocator.h"
class StackAllocator : public BaseAllocator
{
public:
StackAllocator(int blocksize, const char* name);
virtual ~StackAllocator ();
virtual void* Allocate (size_t size, int align);
virtual void* Reallocate (void* p, size_t size, int align);
virtual void Deallocate (void* p);
virtual bool Contains (const void* p);
virtual size_t GetPtrSize(const void* ptr) const;
virtual size_t GetAllocatedMemorySize() const;
virtual size_t GetAllocatorSizeTotalUsed() const;
virtual size_t GetReservedSizeTotal() const;
private:
struct Header{
int deleted:1;
int size:31;
char* prevPtr;
void* realPtr;
};
char* m_Block;
int m_BlockSize;
char* m_LastAlloc;
//ThreadID owningThread;
bool InBlock ( const void* ptr ) const;
bool IsDeleted ( const void* ptr ) const;
void SetDeleted ( const void* ptr );
char* GetPrevAlloc ( const void* ptr ) const;
void* GetRealPtr( void* ptr ) const;
char* GetBufferFreePtr() const;
bool ContainsInternal (const void* p);
UInt32 GetHeaderSize() const;
void UpdateNextHeader(void* before, void* after);
};
inline bool StackAllocator::Contains (const void* p)
{
// most common case. pointer being queried is the one about to be destroyed
if(p != NULL && p == m_LastAlloc)
return true;
return ContainsInternal(p);
}
inline char* StackAllocator::GetBufferFreePtr() const
{
if (m_LastAlloc == NULL)
return m_Block;
Header* h = ((Header*)m_LastAlloc)-1;
return m_LastAlloc + h->size;
}
inline size_t StackAllocator::GetPtrSize( const void* ptr ) const
{
Header* header = ( (Header*)ptr )-1;
return header->size;
}
inline void* StackAllocator::GetRealPtr( void* ptr ) const
{
Header* header = ( (Header*)ptr )-1;
return header->realPtr;
}
inline char* StackAllocator::GetPrevAlloc(const void* ptr ) const
{
if (ptr == NULL)
return NULL;
Header* h = ((Header*)ptr)-1;
return h->prevPtr;
}
inline UInt32 StackAllocator::GetHeaderSize() const
{
return sizeof(Header);
}
inline bool StackAllocator::InBlock(const void* ptr) const
{
return ptr >= m_Block && ptr < (m_Block + m_BlockSize);
}
inline bool StackAllocator::IsDeleted(const void* ptr ) const
{
if (ptr == NULL)
return false;
Header* h = ((Header*)ptr)-1;
return h->deleted != 0;
}
inline void StackAllocator::SetDeleted(const void* ptr )
{
if (ptr == NULL)
return;
Header* h = ((Header*)ptr)-1;
h->deleted = 1;
}
#endif
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