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123456789101112131415161718192021222324252627282930313233//// free.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Implementation of free().//#include <corecrt_internal.h>#include <malloc.h>
// Frees a block in the heap. The 'block' pointer must either be a null pointer// or must point to a valid block in the heap.//// This function supports patching and therefore must be marked noinline.// Both _free_dbg and _free_base must also be marked noinline// to prevent identical COMDAT folding from substituting calls to free// with either other function or vice versa.extern "C" _CRT_HYBRIDPATCHABLE __declspec(noinline) void __cdecl free(void* const block){ // Some libraries that hook memory allocation routines (such as libtcmalloc) // look for an appropriate place inside free to place a patch to its version // of free. Without these extra instructions padding the call to _free_base, // some libraries may choose to insert this patch in _free_base instead. volatile int extra_instructions_for_patching_libraries = 0; (void) extra_instructions_for_patching_libraries;
#ifdef _DEBUG _free_dbg(block, _NORMAL_BLOCK); #else _free_base(block); #endif}