12bc53e031
-- c99f979ad34f155fbeeea69b88bdc7458d89a21c by Derek Mauro <dmauro@google.com>: Remove a floating point division by zero test. This isn't testing behavior related to the library, and MSVC warns about it in opt mode. PiperOrigin-RevId: 285220804 -- 68b015491f0dbf1ab547994673281abd1f34cd4b by Gennadiy Rozental <rogeeff@google.com>: This CL introduces following changes to the class FlagImpl: * We eliminate the CommandLineFlagLocks struct. Instead callback guard and callback function are combined into a single CallbackData struct, while primary data lock is stored separately. * CallbackData member of class FlagImpl is initially set to be nullptr and is only allocated and initialized when a flag's callback is being set. For most flags we do not pay for the extra space and extra absl::Mutex now. * Primary data guard is stored in data_guard_ data member. This is a properly aligned character buffer of necessary size. During initialization of the flag we construct absl::Mutex in this space using placement new call. * We now avoid extra value copy after successful attempt to parse value out of string. Instead we swap flag's current value with tentative value we just produced. PiperOrigin-RevId: 285132636 -- ed45d118fb818969eb13094cf7827c885dfc562c by Tom Manshreck <shreck@google.com>: Change null-term* (and nul-term*) to NUL-term* in comments PiperOrigin-RevId: 285036610 -- 729619017944db895ce8d6d29c1995aa2e5628a5 by Derek Mauro <dmauro@google.com>: Use the Posix implementation of thread identity on MinGW. Some versions of MinGW suffer from thread_local bugs. PiperOrigin-RevId: 285022920 -- 39a25493503c76885bc3254c28f66a251c5b5bb0 by Greg Falcon <gfalcon@google.com>: Implementation detail change. Add further ABSL_NAMESPACE_BEGIN and _END annotation macros to files in Abseil. PiperOrigin-RevId: 285012012 GitOrigin-RevId: c99f979ad34f155fbeeea69b88bdc7458d89a21c Change-Id: I4c85d3704e45d11a9ac50d562f39640a6adbedc1
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
// Copyright 2018 The Abseil Authors.
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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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// https://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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// See "Retrieving Symbol Information by Address":
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// https://msdn.microsoft.com/en-us/library/windows/desktop/ms680578(v=vs.85).aspx
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#include <windows.h>
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// MSVC header dbghelp.h has a warning for an ignored typedef.
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#pragma warning(push)
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#pragma warning(disable:4091)
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#include <dbghelp.h>
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#pragma warning(pop)
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#pragma comment(lib, "dbghelp.lib")
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#include <algorithm>
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#include <cstring>
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#include "absl/base/internal/raw_logging.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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static HANDLE process = NULL;
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void InitializeSymbolizer(const char*) {
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if (process != nullptr) {
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return;
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}
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process = GetCurrentProcess();
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// Symbols are not loaded until a reference is made requiring the
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// symbols be loaded. This is the fastest, most efficient way to use
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// the symbol handler.
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SymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_UNDNAME);
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if (!SymInitialize(process, nullptr, true)) {
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// GetLastError() returns a Win32 DWORD, but we assign to
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// unsigned long long to simplify the ABSL_RAW_LOG case below. The uniform
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// initialization guarantees this is not a narrowing conversion.
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const unsigned long long error{GetLastError()}; // NOLINT(runtime/int)
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ABSL_RAW_LOG(FATAL, "SymInitialize() failed: %llu", error);
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}
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}
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bool Symbolize(const void* pc, char* out, int out_size) {
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if (out_size <= 0) {
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return false;
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}
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alignas(SYMBOL_INFO) char buf[sizeof(SYMBOL_INFO) + MAX_SYM_NAME];
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SYMBOL_INFO* symbol = reinterpret_cast<SYMBOL_INFO*>(buf);
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symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
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symbol->MaxNameLen = MAX_SYM_NAME;
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if (!SymFromAddr(process, reinterpret_cast<DWORD64>(pc), nullptr, symbol)) {
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return false;
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}
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strncpy(out, symbol->Name, out_size);
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if (out[out_size - 1] != '\0') {
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// strncpy() does not '\0' terminate when it truncates.
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static constexpr char kEllipsis[] = "...";
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int ellipsis_size =
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std::min<int>(sizeof(kEllipsis) - 1, out_size - 1);
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memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size);
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out[out_size - 1] = '\0';
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}
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return true;
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}
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ABSL_NAMESPACE_END
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} // namespace absl
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