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// Copyright Epic Games, Inc. All Rights Reserved.
#include <zencore/memory/mallocansi.h>
#include <zencore/intmath.h>
#include <zencore/memory/align.h>
#include <zencore/windows.h>
#if ZEN_PLATFORM_LINUX
# define PLATFORM_USE_ANSI_POSIX_MALLOC 1
#endif
#if ZEN_PLATFORM_MAC
# define PLATFORM_USE_CUSTOM_MEMALIGN 1
#endif
#ifndef PLATFORM_USE_ANSI_MEMALIGN
# define PLATFORM_USE_ANSI_MEMALIGN 0
#endif
#ifndef PLATFORM_USE_ANSI_POSIX_MALLOC
# define PLATFORM_USE_ANSI_POSIX_MALLOC 0
#endif
#ifndef PLATFORM_USE_CUSTOM_MEMALIGN
# define PLATFORM_USE_CUSTOM_MEMALIGN 0
#endif
#if PLATFORM_USE_ANSI_POSIX_MALLOC
# include <malloc.h>
# include <string.h>
#endif
#define MALLOC_ANSI_USES__ALIGNED_MALLOC ZEN_PLATFORM_WINDOWS
namespace zen {
//////////////////////////////////////////////////////////////////////////
void*
AnsiMalloc(size_t Size, uint32_t Alignment)
{
#if MALLOC_ANSI_USES__ALIGNED_MALLOC
void* Result = _aligned_malloc(Size, Alignment);
#elif PLATFORM_USE_ANSI_POSIX_MALLOC
void* Result;
if (posix_memalign(&Result, Alignment, Size) != 0)
{
Result = nullptr;
}
#elif PLATFORM_USE_ANSI_MEMALIGN
Result = reallocalign(Ptr, NewSize, Alignment);
#elif PLATFORM_USE_CUSTOM_MEMALIGN
void* Ptr = malloc(Size + Alignment + sizeof(void*) + sizeof(size_t));
void* Result = nullptr;
if (Ptr)
{
Result = Align((uint8_t*)Ptr + sizeof(void*) + sizeof(size_t), Alignment);
*((void**)((uint8_t*)Result - sizeof(void*))) = Ptr;
*((size_t*)((uint8_t*)Result - sizeof(void*) - sizeof(size_t))) = Size;
}
#else
# error Unknown allocation path
#endif
return Result;
}
size_t
AnsiGetAllocationSize(void* Original)
{
#if MALLOC_ANSI_USES__ALIGNED_MALLOC
return _aligned_msize(Original, 16, 0); // TODO: incorrectly assumes alignment of 16
#elif PLATFORM_USE_ANSI_POSIX_MALLOC || PLATFORM_USE_ANSI_MEMALIGN
return malloc_usable_size(Original);
#elif PLATFORM_USE_CUSTOM_MEMALIGN
return *((size_t*)((uint8_t*)Original - sizeof(void*) - sizeof(size_t)));
#else
# error Unknown allocation path
#endif
}
void*
AnsiRealloc(void* Ptr, size_t NewSize, uint32_t Alignment)
{
void* Result = nullptr;
#if MALLOC_ANSI_USES__ALIGNED_MALLOC
if (Ptr && NewSize)
{
Result = _aligned_realloc(Ptr, NewSize, Alignment);
}
else if (Ptr == nullptr)
{
Result = _aligned_malloc(NewSize, Alignment);
}
else
{
_aligned_free(Ptr);
Result = nullptr;
}
#elif PLATFORM_USE_ANSI_POSIX_MALLOC
if (Ptr && NewSize)
{
size_t UsableSize = malloc_usable_size(Ptr);
if (posix_memalign(&Result, Alignment, NewSize) != 0)
{
Result = nullptr;
}
else if (UsableSize)
{
memcpy(Result, Ptr, Min(NewSize, UsableSize));
}
free(Ptr);
}
else if (Ptr == nullptr)
{
if (posix_memalign(&Result, Alignment, NewSize) != 0)
{
Result = nullptr;
}
}
else
{
free(Ptr);
Result = nullptr;
}
#elif PLATFORM_USE_CUSTOM_MEMALIGN
if (Ptr && NewSize)
{
// Can't use realloc as it might screw with alignment.
Result = AnsiMalloc(NewSize, Alignment);
size_t PtrSize = AnsiGetAllocationSize(Ptr);
memcpy(Result, Ptr, Min(NewSize, PtrSize));
AnsiFree(Ptr);
}
else if (Ptr == nullptr)
{
Result = AnsiMalloc(NewSize, Alignment);
}
else
{
free(*((void**)((uint8_t*)Ptr - sizeof(void*))));
Result = nullptr;
}
#else
# error Unknown allocation path
#endif
return Result;
}
void
AnsiFree(void* Ptr)
{
#if MALLOC_ANSI_USES__ALIGNED_MALLOC
_aligned_free(Ptr);
#elif PLATFORM_USE_ANSI_POSIX_MALLOC || PLATFORM_USE_ANSI_MEMALIGN
free(Ptr);
#elif PLATFORM_USE_CUSTOM_MEMALIGN
if (Ptr)
{
free(*((void**)((uint8_t*)Ptr - sizeof(void*))));
}
#else
# error Unknown allocation path
#endif
}
//////////////////////////////////////////////////////////////////////////
FMallocAnsi::FMallocAnsi()
{
#if ZEN_PLATFORM_WINDOWS
// Enable low fragmentation heap - http://msdn2.microsoft.com/en-US/library/aa366750.aspx
intptr_t CrtHeapHandle = _get_heap_handle();
ULONG EnableLFH = 2;
HeapSetInformation((void*)CrtHeapHandle, HeapCompatibilityInformation, &EnableLFH, sizeof(EnableLFH));
#endif
}
void*
FMallocAnsi::TryMalloc(size_t Size, uint32_t Alignment)
{
Alignment = Max(Size >= 16 ? (uint32_t)16 : (uint32_t)8, Alignment);
void* Result = AnsiMalloc(Size, Alignment);
return Result;
}
void*
FMallocAnsi::Malloc(size_t Size, uint32_t Alignment)
{
void* Result = TryMalloc(Size, Alignment);
if (Result == nullptr && Size)
{
OutOfMemory(Size, Alignment);
}
return Result;
}
void*
FMallocAnsi::TryRealloc(void* Ptr, size_t NewSize, uint32_t Alignment)
{
Alignment = Max(NewSize >= 16 ? (uint32_t)16 : (uint32_t)8, Alignment);
void* Result = AnsiRealloc(Ptr, NewSize, Alignment);
return Result;
}
void*
FMallocAnsi::Realloc(void* Ptr, size_t NewSize, uint32_t Alignment)
{
void* Result = TryRealloc(Ptr, NewSize, Alignment);
if (Result == nullptr && NewSize != 0)
{
OutOfMemory(NewSize, Alignment);
}
return Result;
}
void
FMallocAnsi::Free(void* Ptr)
{
AnsiFree(Ptr);
}
bool
FMallocAnsi::GetAllocationSize(void* Original, size_t& SizeOut)
{
if (!Original)
{
return false;
}
#if MALLOC_ANSI_USES__ALIGNED_MALLOC
ZEN_UNUSED(SizeOut);
return false;
#else
SizeOut = AnsiGetAllocationSize(Original);
return true;
#endif
}
} // namespace zen
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