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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960//// realloc_base.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Implementation of _realloc_base(). This is defined in a different source// file from the realloc() function to allow realloc() to be replaced by the// user.//#include <corecrt_internal.h>#include <malloc.h>#include <new.h>
// This function implements the logic of realloc(). It is called directly by// the realloc() and _recalloc() functions in the Release CRT and is called by// the debug heap in the Debug CRT.//// This function must be marked noinline, otherwise realloc and// _realloc_base will have identical COMDATs, and the linker will fold// them when calling one from the CRT. This is necessary because realloc// needs to support users patching in custom implementations.extern "C" __declspec(noinline) _CRTRESTRICT void* __cdecl _realloc_base( void* const block, size_t const size ){ // If the block is a nullptr, just call malloc: if (block == nullptr) return _malloc_base(size);
// If the new size is 0, just call free and return nullptr: if (size == 0) { _free_base(block); return nullptr; }
// Ensure that the requested size is not too large: _VALIDATE_RETURN_NOEXC(_HEAP_MAXREQ >= size, ENOMEM, nullptr);
for (;;) { void* const new_block = HeapReAlloc(__acrt_heap, 0, block, size); if (new_block) return new_block;
// Otherwise, see if we need to call the new handler, and if so call it. // If the new handler fails, just return nullptr: if (_query_new_mode() == 0 || !_callnewh(size)) { errno = ENOMEM; return nullptr; }
// The new handler was successful; try to allocate again... }}