64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
// Copyright (c) 2012-2022 Wojciech Figat. All rights reserved.
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#if PLATFORM_UNIX
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#include "Engine/Platform/Platform.h"
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#include <sys/types.h>
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#include <unistd.h>
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#include <cstdint>
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#include <stdlib.h>
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typedef uint16_t offset_t;
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#define align_mem_up(num, align) (((num) + ((align) - 1)) & ~((align) - 1))
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void* UnixPlatform::Allocate(uint64 size, uint64 alignment)
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{
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void* ptr = nullptr;
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// Alignment always has to be power of two
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ASSERT_LOW_LAYER((alignment & (alignment - 1)) == 0);
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if (alignment && size)
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{
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uint32_t pad = sizeof(offset_t) + (alignment - 1);
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void* p = malloc(size + pad);
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if (p)
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{
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// Add the offset size to malloc's pointer
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ptr = (void*)align_mem_up(((uintptr_t)p + sizeof(offset_t)), alignment);
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// Calculate the offset and store it behind aligned pointer
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*((offset_t*)ptr - 1) = (offset_t)((uintptr_t)ptr - (uintptr_t)p);
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}
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#if COMPILE_WITH_PROFILER
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OnMemoryAlloc(ptr, size);
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#endif
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}
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return ptr;
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}
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void UnixPlatform::Free(void* ptr)
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{
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if (ptr)
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{
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#if COMPILE_WITH_PROFILER
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OnMemoryFree(ptr);
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#endif
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// Walk backwards from the passed-in pointer to get the pointer offset
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offset_t offset = *((offset_t*)ptr - 1);
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// Get original pointer
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void* p = (void*)((uint8_t*)ptr - offset);
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// Free memory
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free(p);
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}
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}
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uint64 UnixPlatform::GetCurrentProcessId()
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{
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return getpid();
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}
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#endif
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