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This uses “static” at function scope to avoid making local copies, even in cases where the compiler can’t see that the local copy is unnecessary. “constexpr” adds additional safety in that it prevents global state from being initialized from any runtime dependencies, which would be undesirable. At namespace scope, “constexpr” is also used where appropriate. For the most part, this was a mechanical transformation for things matching '(^| )const [^=]*\['. Similar transformations could be applied to non-arrays in some cases, but there’s limited practical impact in most non-array cases relative to arrays, there are far more use sites, and much more manual intervention would be required. Change-Id: I3513b739ee8b0be026f8285475cddc5f9cc81152 Reviewed-on: https://chromium-review.googlesource.com/583997 Commit-Queue: Mark Mentovai <mark@chromium.org> Reviewed-by: Leonard Mosescu <mosescu@chromium.org>
144 lines
5.0 KiB
C++
144 lines
5.0 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 "util/misc/address_sanitizer.h"
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#include "util/misc/from_pointer_cast.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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constexpr 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_POSIX)
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__attribute__((
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// Put the structure in a well-known section name where it can be easily
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// found without having to consult the symbol table.
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#if defined(OS_MACOSX)
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section(SEG_DATA ",crashpad_info"),
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#elif defined(OS_LINUX) || defined(OS_ANDROID)
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section("crashpad_info"),
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#else // !defined(OS_MACOSX) && !defined(OS_LINUX) && !defined(OS_ANDROID)
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#error Port
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#endif // !defined(OS_MACOSX) && !defined(OS_LINUX) && !defined(OS_ANDROID)
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#if defined(ADDRESS_SANITIZER)
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// AddressSanitizer would add a trailing red zone of at least 32 bytes,
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// which would be reflected in the size of the custom section. This confuses
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// MachOImageReader::GetCrashpadInfo(), which finds that the section’s size
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// disagrees with the structure’s size_ field. By specifying an alignment
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// greater than the red zone size, the red zone will be suppressed.
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aligned(64),
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#endif // defined(ADDRESS_SANITIZER)
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// The “used” attribute prevents the structure from being dead-stripped.
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used,
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// There’s no need to expose this as a public symbol from the symbol table.
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// All accesses from the outside can locate the well-known section name.
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visibility("hidden")))
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#elif defined(OS_WIN)
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// Put the struct in a section name CPADinfo where it can be found without the
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// symbol table.
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#pragma section("CPADinfo", read, write)
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__declspec(allocate("CPADinfo"))
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#else // !defined(OS_POSIX) && !defined(OS_WIN)
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#error Port
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#endif // !defined(OS_POSIX) && !defined(OS_WIN)
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CrashpadInfo g_crashpad_info;
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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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indirectly_referenced_memory_cap_(0),
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padding_0_(0),
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crashpad_handler_behavior_(TriState::kUnset),
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system_crash_reporter_forwarding_(TriState::kUnset),
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gather_indirectly_referenced_memory_(TriState::kUnset),
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padding_1_(0),
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extra_memory_ranges_(nullptr),
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simple_annotations_(nullptr),
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user_data_minidump_stream_head_(nullptr)
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#if !defined(NDEBUG) && defined(OS_WIN)
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,
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invalid_read_detection_(0xbadc0de)
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#endif
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{
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}
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void CrashpadInfo::AddUserDataMinidumpStream(uint32_t stream_type,
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const void* data,
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size_t size) {
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auto to_be_added = new internal::UserDataMinidumpStreamListEntry();
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to_be_added->next =
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FromPointerCast<uint64_t>(user_data_minidump_stream_head_);
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to_be_added->stream_type = stream_type;
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to_be_added->base_address = FromPointerCast<uint64_t>(data);
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to_be_added->size = base::checked_cast<uint64_t>(size);
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user_data_minidump_stream_head_ = to_be_added;
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}
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} // namespace crashpad
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