77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
// Copyright 2015 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/stdlib/aligned_allocator.h"
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#include <algorithm>
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#include "build/build_config.h"
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#if BUILDFLAG(IS_POSIX) || defined(_LIBCPP_STD_VER) || defined(__MINGW32__)
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#include <stdlib.h>
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#elif BUILDFLAG(IS_WIN)
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#include <malloc.h>
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#include <xutility>
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#endif // BUILDFLAG(IS_POSIX)
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namespace {
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// Throws std::bad_alloc() by calling an internal function provided by the C++
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// library to do so. This works even if C++ exceptions are disabled, causing
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// program termination if uncaught.
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void ThrowBadAlloc() {
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#if BUILDFLAG(IS_POSIX) || defined(_LIBCPP_STD_VER) || defined(__MINGW32__)
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// This works with both libc++ and libstdc++.
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std::__throw_bad_alloc();
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#elif BUILDFLAG(IS_WIN)
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std::_Xbad_alloc();
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#endif // BUILDFLAG(IS_POSIX)
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}
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} // namespace
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namespace crashpad {
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void* AlignedAllocate(size_t alignment, size_t size) {
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#if BUILDFLAG(IS_POSIX)
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// posix_memalign() requires that alignment be at least sizeof(void*), so the
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// power-of-2 check needs to happen before potentially changing the alignment.
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if (alignment == 0 || alignment & (alignment - 1)) {
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ThrowBadAlloc();
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}
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void* pointer;
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if (posix_memalign(&pointer, std::max(alignment, sizeof(void*)), size) != 0) {
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ThrowBadAlloc();
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}
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#elif BUILDFLAG(IS_WIN)
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void* pointer = _aligned_malloc(size, alignment);
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if (pointer == nullptr) {
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ThrowBadAlloc();
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}
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#endif // BUILDFLAG(IS_POSIX)
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return pointer;
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}
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void AlignedFree(void* pointer) {
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#if BUILDFLAG(IS_POSIX)
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free(pointer);
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#elif BUILDFLAG(IS_WIN)
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_aligned_free(pointer);
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#endif // BUILDFLAG(IS_POSIX)
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}
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} // namespace crashpad
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