| // Copyright 2018 The Abseil Authors. |
| // |
| // 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 |
| // |
| // https://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. |
| |
| // See "Retrieving Symbol Information by Address": |
| // https://msdn.microsoft.com/en-us/library/windows/desktop/ms680578(v=vs.85).aspx |
| |
| #include <windows.h> |
| #include <DbgHelp.h> |
| #pragma comment(lib, "DbgHelp") |
| |
| #include <algorithm> |
| #include <cstring> |
| |
| #include "absl/base/internal/raw_logging.h" |
| |
| namespace absl { |
| |
| static HANDLE process = NULL; |
| |
| void InitializeSymbolizer(const char *argv0) { |
| if (process != nullptr) { |
| return; |
| } |
| process = GetCurrentProcess(); |
| |
| // Symbols are not loaded until a reference is made requiring the |
| // symbols be loaded. This is the fastest, most efficient way to use |
| // the symbol handler. |
| SymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_UNDNAME); |
| if (!SymInitialize(process, nullptr, true)) { |
| // GetLastError() returns a Win32 DWORD, but we assign to |
| // unsigned long long to simplify the ABSL_RAW_LOG case below. The uniform |
| // initialization guarantees this is not a narrowing conversion. |
| const unsigned long long error{GetLastError()}; // NOLINT(runtime/int) |
| ABSL_RAW_LOG(FATAL, "SymInitialize() failed: %llu", error); |
| } |
| } |
| |
| bool Symbolize(const void *pc, char *out, int out_size) { |
| if (out_size <= 0) { |
| return false; |
| } |
| std::aligned_storage<sizeof(SYMBOL_INFO) + MAX_SYM_NAME, |
| alignof(SYMBOL_INFO)>::type buf; |
| SYMBOL_INFO *symbol = reinterpret_cast<SYMBOL_INFO *>(&buf); |
| symbol->SizeOfStruct = sizeof(SYMBOL_INFO); |
| symbol->MaxNameLen = MAX_SYM_NAME; |
| if (!SymFromAddr(process, reinterpret_cast<DWORD64>(pc), nullptr, symbol)) { |
| return false; |
| } |
| strncpy(out, symbol->Name, out_size); |
| if (out[out_size - 1] != '\0') { |
| // strncpy() does not '\0' terminate when it truncates. |
| static constexpr char kEllipsis[] = "..."; |
| int ellipsis_size = |
| std::min<int>(sizeof(kEllipsis) - 1, out_size - 1); |
| memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size); |
| out[out_size - 1] = '\0'; |
| } |
| return true; |
| } |
| |
| } // namespace absl |