75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: sw=4 ts=4 et :
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Types.h"
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#include <windows.h>
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// Building with USE_STATIC_LIBS = True sets -MT instead of -MD. -MT sets _MT,
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// while -MD sets _MT and _DLL.
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#if defined(_MT) && !defined(_DLL)
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#define MOZ_STATIC_RUNTIME
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#endif
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#if defined(MOZ_MEMORY) && !defined(MOZ_STATIC_RUNTIME)
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// mozalloc.cpp is part of the same library as mozmemory, thus MOZ_MEMORY_IMPL
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// is needed.
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#define MOZ_MEMORY_IMPL
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#include "mozmemory_wrap.h"
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// See mozmemory_wrap.h for more details. This file is part of libmozglue, so
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// it needs to use _impl suffixes. However, with libmozglue growing, this is
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// becoming cumbersome, so we will likely use a malloc.h wrapper of some sort
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// and allow the use of the functions without a _impl suffix.
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#define MALLOC_DECL(name, return_type, ...) \
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extern "C" MOZ_MEMORY_API return_type name ## _impl(__VA_ARGS__);
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#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC
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#include "malloc_decls.h"
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// Warning: C4273: 'HeapAlloc': inconsistent dll linkage
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// The Windows headers define HeapAlloc as dllimport, but we define it as
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// dllexport, which is a voluntary inconsistency.
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#pragma warning(disable: 4273)
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MFBT_API
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LPVOID WINAPI HeapAlloc(_In_ HANDLE hHeap, _In_ DWORD dwFlags,
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_In_ SIZE_T dwBytes)
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{
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if (dwFlags & HEAP_ZERO_MEMORY) {
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return calloc_impl(1, dwBytes);
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}
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return malloc_impl(dwBytes);
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}
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MFBT_API
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LPVOID WINAPI HeapReAlloc(_In_ HANDLE hHeap, _In_ DWORD dwFlags,
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_In_ LPVOID lpMem, _In_ SIZE_T dwBytes)
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{
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// The HeapReAlloc contract is that failures preserve the existing
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// allocation. We can't try to realloc in-place without possibly
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// freeing the original allocation, breaking the contract.
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// We also can't guarantee we zero all the memory from the end of
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// the original allocation to the end of the new one because of the
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// difference between the originally requested size and what
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// malloc_usable_size would return us.
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// So for both cases, just tell the caller we can't do what they
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// requested.
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if (dwFlags & (HEAP_REALLOC_IN_PLACE_ONLY | HEAP_ZERO_MEMORY)) {
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return NULL;
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}
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return realloc_impl(lpMem, dwBytes);
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}
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MFBT_API
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BOOL WINAPI HeapFree(_In_ HANDLE hHeap, _In_ DWORD dwFlags,
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_In_ LPVOID lpMem)
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{
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free_impl(lpMem);
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return true;
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}
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#endif
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