root/MMgc/FixedMalloc-inlines.h

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#ifndef __FixedMalloc_inlines__
#define __FixedMalloc_inlines__

// Inline function definitions for FixedMalloc.

namespace MMgc
{
        /*static*/
        REALLY_INLINE FixedMalloc* FixedMalloc::GetInstance() { return instance; }

        /*static*/
        REALLY_INLINE FixedMalloc* FixedMalloc::GetFixedMalloc() { return instance; }

        REALLY_INLINE void* FixedMalloc::Alloc(size_t size, FixedMallocOpts flags)
        {
                // Observe that no size overflow check is needed for small allocations;
                // the large-object allocator performs the necessary checking in that case.

                if (size <= (size_t)kLargestAlloc) {
                        return FindSizeClass(size)->Alloc(size, flags);
                } else {
                        return LargeAlloc(size, flags);
                }
        }

        REALLY_INLINE void *FixedMalloc::PleaseAlloc(size_t size)
        {       
                return Alloc(size, kCanFail);
        }

        REALLY_INLINE void FixedMalloc::Free(void *item)
        {
                if(item == 0)
                        return;

#ifdef _DEBUG
                EnsureFixedMallocMemory(item);
#endif

                // small things are never allocated on the 4K boundary b/c the block
                // header structure is stored there, large things always are            
                if(IsLargeAlloc(item)) {
                        LargeFree(item);
                } else {                
                        FixedAllocSafe::GetFixedAllocSafe(item)->Free(item);
                }
        }

        REALLY_INLINE size_t FixedMalloc::Size(const void *item)
        {
                size_t size;
                if(IsLargeAlloc(item)) {
                        size = LargeSize(item);
                } else {                
                        size = FixedAlloc::Size(item);
                }
#ifdef MMGC_MEMORY_INFO
                size -= DebugSize();
#endif
                return size;
        }

        REALLY_INLINE size_t FixedMalloc::GetBytesInUse()
        {
                size_t totalAskSize, totalAllocated;  
                GetUsageInfo(totalAskSize, totalAllocated);
                return totalAllocated;                  
        }

        /*static*/ 
        REALLY_INLINE bool FixedMalloc::IsLargeAlloc(const void *item)
        {
                // space made in ctor
                item = GetRealPointer(item);
                return ((uintptr_t) item & 0xFFF) == 0;
        }

        REALLY_INLINE FixedAllocSafe* FixedMalloc::FindSizeClass(size_t size)
        {
                GCAssertMsg(size > 0, "cannot allocate a 0 sized block\n");

#ifdef _DEBUG
                uint32_t const size8 = (uint32_t)((size+7)&~7); // round up to multiple of 8
                GCAssert((size8 >> 3) < kMaxSizeClassIndex);
                GCAssert(size8 <= (uint32_t)kLargestAlloc);
#endif

                // index is (conceptually) "(size8>>3)" but this allows
                // us to skip the &~7 that is redundant for nondebug builds...
#ifdef MMGC_64BIT
                unsigned const index = kSizeClassIndex[((size+7)>>3)];
#else
                // first bucket is 4 on 32-bit, so just special case that rather than
                // double the size-class-index table
                unsigned const index = (size <= 4) ? 0 : kSizeClassIndex[((size+7)>>3)];
#endif

                // assert that I fit
                GCAssert(size <= m_allocs[index].GetItemSize());

                // assert that I don't fit (makes sure we don't waste space
                GCAssert(index == 0 || size > m_allocs[index-1].GetItemSize());

                return &m_allocs[index];
        }

}

#endif /* __FixedMalloc_inlines__ */