| // Copyright 2014 The Crashpad Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "client/crashpad_info.h" |
| |
| #include "build/build_config.h" |
| #include "util/stdlib/cxx.h" |
| |
| #if defined(OS_MACOSX) |
| #include <mach-o/loader.h> |
| #endif |
| |
| #if CXX_LIBRARY_VERSION >= 2011 |
| #include <type_traits> |
| #endif |
| |
| namespace { |
| |
| static const uint32_t kCrashpadInfoVersion = 1; |
| |
| } // namespace |
| |
| namespace crashpad { |
| |
| #if CXX_LIBRARY_VERSION >= 2011 || DOXYGEN |
| // In C++11, check that CrashpadInfo has standard layout, which is what is |
| // actually important. |
| static_assert(std::is_standard_layout<CrashpadInfo>::value, |
| "CrashpadInfo must be standard layout"); |
| #else |
| // In C++98 (ISO 14882), section 9.5.1 says that a union cannot have a member |
| // with a non-trivial ctor, copy ctor, dtor, or assignment operator. Use this |
| // property to ensure that CrashpadInfo remains POD. This doesn’t work for C++11 |
| // because the requirements for unions have been relaxed. |
| union Compile_Assert { |
| CrashpadInfo Compile_Assert__CrashpadInfo_must_be_pod; |
| }; |
| #endif |
| |
| // This structure needs to be stored somewhere that is easy to find without |
| // external information. |
| // |
| // It isn’t placed in an unnamed namespace: hopefully, this will catch attempts |
| // to place multiple copies of this structure into the same module. If that’s |
| // attempted, and the name of the symbol is the same in each translation unit, |
| // it will result in a linker error, which is better than having multiple |
| // structures show up. |
| // |
| // This may result in a static module initializer in debug-mode builds, but |
| // because it’s POD, no code should need to run to initialize this under |
| // release-mode optimization. |
| #if defined(OS_MACOSX) |
| |
| // Put the structure in __DATA,__crashpad_info where it can be easily found |
| // without having to consult the symbol table. The “used” attribute prevents it |
| // from being dead-stripped. |
| __attribute__((section(SEG_DATA ",__crashpad_info"), |
| used, |
| visibility("hidden") |
| #if __has_feature(address_sanitizer) |
| // AddressSanitizer would add a trailing red zone of at least 32 bytes, which |
| // would be reflected in the size of the custom section. This confuses |
| // MachOImageReader::GetCrashpadInfo(), which finds that the section’s size |
| // disagrees with the structure’s size_ field. By specifying an alignment |
| // greater than the red zone size, the red zone will be suppressed. |
| , |
| aligned(64) |
| #endif |
| )) CrashpadInfo g_crashpad_info; |
| |
| #elif defined(OS_WIN) |
| |
| // Put the struct in a section name CPADinfo where it can be found without the |
| // symbol table. |
| #pragma section("CPADinfo", read, write) |
| __declspec(allocate("CPADinfo")) CrashpadInfo g_crashpad_info; |
| |
| #endif |
| |
| // static |
| CrashpadInfo* CrashpadInfo::GetCrashpadInfo() { |
| return &g_crashpad_info; |
| } |
| |
| CrashpadInfo::CrashpadInfo() |
| : signature_(kSignature), |
| size_(sizeof(*this)), |
| version_(kCrashpadInfoVersion), |
| crashpad_handler_behavior_(TriState::kUnset), |
| system_crash_reporter_forwarding_(TriState::kUnset), |
| padding_0_(0), |
| simple_annotations_(nullptr) |
| #if !defined(NDEBUG) && defined(OS_WIN) |
| , |
| invalid_read_detection_(0xbadc0de) |
| #endif |
| { |
| |
| } |
| |
| } // namespace crashpad |
