- 3a9532fb2d6ae45c3cba44c9bb0dbdfc1558b7d3 Fix the description of Span::subspan(). by Abseil Team <absl-team@google.com>
- bae1a1c21924bd31fa7315eff05ea6158d9e7947 Port the symbolizer to Windows. by Derek Mauro <dmauro@google.com> - 2253c04c1a4f39d9581772f1dc4491878aa3831f Support absl::Hex() and absl::Dec() as arguments to absl:... by Jorg Brown <jorg@google.com> - 552c3ac259e9c254fda9244755487f3423d2fe4b Internal change by Jorg Brown <jorg@google.com> GitOrigin-RevId: 3a9532fb2d6ae45c3cba44c9bb0dbdfc1558b7d3 Change-Id: I448133c9bb6d837037c12b45a9a16a7945049453pull/117/head
Abseil Team
7 years ago
committed by
Derek Mauro
parent
af7882601a
commit
19b3c95727
10 changed files with 223 additions and 26 deletions
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// 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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// 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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|
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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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#include <DbgHelp.h> |
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#pragma comment(lib, "DbgHelp") |
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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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static HANDLE process = NULL; |
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void InitializeSymbolizer(const char *argv0) { |
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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 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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std::aligned_storage<sizeof(SYMBOL_INFO) + MAX_SYM_NAME, |
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alignof(SYMBOL_INFO)>::type buf; |
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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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} // namespace absl |
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