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/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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
*
* http://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 _BACKTRACE_BACKTRACE_H
#define _BACKTRACE_BACKTRACE_H
#include <backtrace/backtrace.h>
#include <string>
class BacktraceImpl;
class Backtrace {
public:
Backtrace(BacktraceImpl* impl);
virtual ~Backtrace();
// Get the current stack trace and store in the backtrace_ structure.
virtual bool Unwind(size_t num_ignore_frames);
// Get the function name and offset into the function given the pc.
// If the string is empty, then no valid function name was found.
virtual std::string GetFunctionName(uintptr_t pc, uintptr_t* offset);
// Get the name of the map associated with the given pc. If NULL is returned,
// then map_start is not set. Otherwise, map_start is the beginning of this
// map.
virtual const char* GetMapName(uintptr_t pc, uintptr_t* map_start);
// Finds the memory map associated with the given ptr.
virtual const backtrace_map_info_t* FindMapInfo(uintptr_t ptr);
// Read the data at a specific address.
virtual bool ReadWord(uintptr_t ptr, uint32_t* out_value) = 0;
// Create a string representing the formatted line of backtrace information
// for a single frame.
virtual std::string FormatFrameData(size_t frame_num);
pid_t Pid() { return backtrace_.pid; }
pid_t Tid() { return backtrace_.tid; }
size_t NumFrames() { return backtrace_.num_frames; }
const backtrace_t* GetBacktrace() { return &backtrace_; }
const backtrace_frame_data_t* GetFrame(size_t frame_num) {
return &backtrace_.frames[frame_num];
}
// Create the correct Backtrace object based on what is to be unwound.
// If pid < 0 or equals the current pid, then the Backtrace object
// corresponds to the current process.
// If pid < 0 or equals the current pid and tid >= 0, then the Backtrace
// object corresponds to a thread in the current process.
// If pid >= 0 and tid < 0, then the Backtrace object corresponds to a
// different process.
// Tracing a thread in a different process is not supported.
static Backtrace* Create(pid_t pid, pid_t tid);
protected:
virtual bool VerifyReadWordArgs(uintptr_t ptr, uint32_t* out_value);
BacktraceImpl* impl_;
backtrace_map_info_t* map_info_;
backtrace_t backtrace_;
friend class BacktraceImpl;
};
#endif // _BACKTRACE_BACKTRACE_H
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