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b0cf01978d
Just avoid the Mac-specific __attribute__ tagging for now. There will need to be some Windows-specific pragmas added here once the reader has been written. R=mark@chromium.org BUG=crashpad:1 Review URL: https://codereview.chromium.org/808623002
95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
// Copyright 2014 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 "client/crashpad_info.h"
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#include "build/build_config.h"
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#include "util/stdlib/cxx.h"
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#if defined(OS_MACOSX)
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#include <mach-o/loader.h>
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#endif
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#if CXX_LIBRARY_VERSION >= 2011
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#include <type_traits>
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#endif
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namespace {
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static const uint32_t kCrashpadInfoVersion = 1;
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} // namespace
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namespace crashpad {
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#if CXX_LIBRARY_VERSION >= 2011 || DOXYGEN
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// In C++11, check that CrashpadInfo has standard layout, which is what is
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// actually important.
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static_assert(std::is_standard_layout<CrashpadInfo>::value,
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"CrashpadInfo must be standard layout");
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#else
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// In C++98 (ISO 14882), section 9.5.1 says that a union cannot have a member
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// with a non-trivial ctor, copy ctor, dtor, or assignment operator. Use this
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// property to ensure that CrashpadInfo remains POD. This doesn’t work for C++11
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// because the requirements for unions have been relaxed.
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union Compile_Assert {
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CrashpadInfo Compile_Assert__CrashpadInfo_must_be_pod;
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};
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#endif
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// This structure needs to be stored somewhere that is easy to find without
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// external information.
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//
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// It isn’t placed in an unnamed namespace: hopefully, this will catch attempts
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// to place multiple copies of this structure into the same module. If that’s
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// attempted, and the name of the symbol is the same in each translation unit,
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// it will result in a linker error, which is better than having multiple
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// structures show up.
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//
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// This may result in a static module initializer in debug-mode builds, but
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// because it’s POD, no code should need to run to initialize this under
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// release-mode optimization.
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#if defined(OS_MACOSX)
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// Put the structure in __DATA,__crashpad_info where it can be easily found
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// without having to consult the symbol table. The “used” attribute prevents it
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// from being dead-stripped.
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__attribute__((section(SEG_DATA ",__crashpad_info"),
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used,
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visibility("hidden"))) CrashpadInfo g_crashpad_info;
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#elif defined(OS_WIN)
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// TODO(scottmg): Tag in a way that makes it easy to locate on Windows.
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CrashpadInfo g_crashpad_info;
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#endif
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// static
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CrashpadInfo* CrashpadInfo::GetCrashpadInfo() {
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return &g_crashpad_info;
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}
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CrashpadInfo::CrashpadInfo()
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: signature_(kSignature),
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size_(sizeof(*this)),
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version_(kCrashpadInfoVersion),
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padding_0_(0),
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simple_annotations_(nullptr) {
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}
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const uint32_t CrashpadInfo::kSignature;
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} // namespace crashpad
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