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//
// 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.
//
#ifndef ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_
#define ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace debugging_internal {
// Type of function used for printing in stack trace dumping, etc.
// We avoid closures to keep things simple.
typedef void OutputWriter(const char*, void*);
// RegisterDebugStackTraceHook() allows to register a single routine
// `hook` that is called each time DumpStackTrace() is called.
// `hook` may be called from a signal handler.
typedef void (*SymbolizeUrlEmitter)(void* const stack[], int depth,
OutputWriter* writer, void* writer_arg);
// Registration of SymbolizeUrlEmitter for use inside of a signal handler.
// This is inherently unsafe and must be signal safe code.
void RegisterDebugStackTraceHook(SymbolizeUrlEmitter hook);
SymbolizeUrlEmitter GetDebugStackTraceHook();
// Returns the program counter from signal context, or nullptr if
// unknown. `vuc` is a ucontext_t*. We use void* to avoid the use of
// ucontext_t on non-POSIX systems.
void* GetProgramCounter(void* const vuc);
// Uses `writer` to dump the program counter, stack trace, and stack
// frame sizes.
void DumpPCAndFrameSizesAndStackTrace(void* const pc, void* const stack[],
int frame_sizes[], int depth,
int min_dropped_frames,
bool symbolize_stacktrace,
OutputWriter* writer, void* writer_arg);
// Dump current stack trace omitting the topmost `min_dropped_frames` stack
// frames.
void DumpStackTrace(int min_dropped_frames, int max_num_frames,
bool symbolize_stacktrace, OutputWriter* writer,
void* writer_arg);
} // namespace debugging_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_
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