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33 lines
1.2 KiB
C++
33 lines
1.2 KiB
C++
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//
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// free.cpp
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// Implementation of free().
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//
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#include <corecrt_internal.h>
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#include <malloc.h>
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// Frees a block in the heap. The 'block' pointer must either be a null pointer
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// or must point to a valid block in the heap.
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//
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// This function supports patching and therefore must be marked noinline.
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// Both _free_dbg and _free_base must also be marked noinline
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// to prevent identical COMDAT folding from substituting calls to free
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// with either other function or vice versa.
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extern "C" _CRT_HYBRIDPATCHABLE __declspec(noinline) void __cdecl free(void* const block)
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{
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// Some libraries that hook memory allocation routines (such as libtcmalloc)
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// look for an appropriate place inside free to place a patch to its version
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// of free. Without these extra instructions padding the call to _free_base,
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// some libraries may choose to insert this patch in _free_base instead.
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volatile int extra_instructions_for_patching_libraries = 0;
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(void) extra_instructions_for_patching_libraries;
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#ifdef _DEBUG
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_free_dbg(block, _NORMAL_BLOCK);
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#else
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_free_base(block);
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#endif
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}
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