3c81410510
-- 97faa5fdfa4cd5d7a74cd9332cddd8a7c1e67b89 by Abseil Team <absl-team@google.com>: Internal changes PiperOrigin-RevId: 295164378 -- 74990f100b3f4172c770ef8c76c05c8e99febdde by Xiaoyi Zhang <zhangxy@google.com>: Release `absl::Cord`. PiperOrigin-RevId: 295161959 -- 6018c57f43c45c31dc1a61c0cd75fa2aa9be8dab by Gennadiy Rozental <rogeeff@google.com>: Introduce independent notion of FlagStaticTypeID. This change separates static flag value type identification from the type specific "vtable" with all the operations specific to value type. This change allows us to do the following: * We can move most of "vtable" implementation from handle header, which will become public soon, into implementation details of Abseil Flag. * We can combine back marshalling ops and general ops into a single vtable routine. They were split previously to facilitate type identification without requiring marshalling routines to be exposed in header. * We do not need to store two vtable pointers. We can now store only one. The static type id can be deduced on request. Overall we are saving 24 bytes per flag according to size_tester run. PiperOrigin-RevId: 295149687 -- 986b78e9ba571aa85154e70bda4580edd45bb7bf by Abseil Team <absl-team@google.com>: Update internal comments. PiperOrigin-RevId: 295030681 -- 825412b29fd6015027bbc3e5f802706eee0d2837 by Matthew Brown <matthewbr@google.com>: Change str_format_internal::ConversionChar to an enum (from a struct-wrapped enum). PiperOrigin-RevId: 294987462 -- f9f88d91809d2cc33fc129df70fa93e7a2c35c69 by Derek Mauro <dmauro@google.com>: Use more precise wording in the question on live-at-head PiperOrigin-RevId: 294957679 GitOrigin-RevId: 97faa5fdfa4cd5d7a74cd9332cddd8a7c1e67b89 Change-Id: I081e70d148ffac7296d65e2a2f775f643eaf70bf
99 lines
3.5 KiB
C++
99 lines
3.5 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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//
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// -----------------------------------------------------------------------------
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// File: symbolize.h
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// -----------------------------------------------------------------------------
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//
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// This file configures the Abseil symbolizer for use in converting instruction
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// pointer addresses (program counters) into human-readable names (function
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// calls, etc.) within Abseil code.
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//
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// The symbolizer may be invoked from several sources:
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//
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// * Implicitly, through the installation of an Abseil failure signal handler.
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// (See failure_signal_handler.h for more information.)
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// * By calling `Symbolize()` directly on a program counter you obtain through
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// `absl::GetStackTrace()` or `absl::GetStackFrames()`. (See stacktrace.h
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// for more information.
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// * By calling `Symbolize()` directly on a program counter you obtain through
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// other means (which would be platform-dependent).
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//
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// In all of the above cases, the symbolizer must first be initialized before
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// any program counter values can be symbolized. If you are installing a failure
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// signal handler, initialize the symbolizer before you do so.
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//
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// Example:
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//
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// int main(int argc, char** argv) {
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// // Initialize the Symbolizer before installing the failure signal handler
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// absl::InitializeSymbolizer(argv[0]);
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//
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// // Now you may install the failure signal handler
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// absl::FailureSignalHandlerOptions options;
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// absl::InstallFailureSignalHandler(options);
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//
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// // Start running your main program
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// ...
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// return 0;
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// }
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//
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#ifndef ABSL_DEBUGGING_SYMBOLIZE_H_
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#define ABSL_DEBUGGING_SYMBOLIZE_H_
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#include "absl/debugging/internal/symbolize.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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// InitializeSymbolizer()
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//
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// Initializes the program counter symbolizer, given the path of the program
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// (typically obtained through `main()`s `argv[0]`). The Abseil symbolizer
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// allows you to read program counters (instruction pointer values) using their
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// human-readable names within output such as stack traces.
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//
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// Example:
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//
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// int main(int argc, char *argv[]) {
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// absl::InitializeSymbolizer(argv[0]);
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// // Now you can use the symbolizer
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// }
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void InitializeSymbolizer(const char* argv0);
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//
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// Symbolize()
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//
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// Symbolizes a program counter (instruction pointer value) `pc` and, on
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// success, writes the name to `out`. The symbol name is demangled, if possible.
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// Note that the symbolized name may be truncated and will be NUL-terminated.
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// Demangling is supported for symbols generated by GCC 3.x or newer). Returns
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// `false` on failure.
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//
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// Example:
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//
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// // Print a program counter and its symbol name.
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// static void DumpPCAndSymbol(void *pc) {
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// char tmp[1024];
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// const char *symbol = "(unknown)";
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// if (absl::Symbolize(pc, tmp, sizeof(tmp))) {
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// symbol = tmp;
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// }
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// absl::PrintF("%p %s\n", pc, symbol);
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// }
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bool Symbolize(const void *pc, char *out, int out_size);
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_DEBUGGING_SYMBOLIZE_H_
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