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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 <stdint.h>
#include <string>
#include <vector>
#include <backtrace/backtrace_constants.h>
#include <backtrace/BacktraceMap.h>
struct backtrace_frame_data_t {
size_t num; // The current fame number.
uintptr_t pc; // The absolute pc.
uintptr_t sp; // The top of the stack.
size_t stack_size; // The size of the stack, zero indicate an unknown stack size.
const backtrace_map_t* map; // The map associated with the given pc.
std::string func_name; // The function name associated with this pc, NULL if not found.
uintptr_t func_offset; // pc relative to the start of the function, only valid if func_name is not NULL.
};
// Forward declarations.
class BacktraceImpl;
class Backtrace {
public:
// 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.
// If map is NULL, then create the map and manage it internally.
// If map is not NULL, the map is still owned by the caller.
static Backtrace* Create(pid_t pid, pid_t tid, BacktraceMap* map = NULL);
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);
// Find the map associated with the given pc.
virtual const backtrace_map_t* FindMap(uintptr_t pc);
// Take ownership of the BacktraceMap object associated with the backtrace.
// If this is called, the caller must handle deleting the object themselves.
virtual BacktraceMap* TakeMapOwnership();
// 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);
virtual std::string FormatFrameData(const backtrace_frame_data_t* frame);
pid_t Pid() { return pid_; }
pid_t Tid() { return tid_; }
size_t NumFrames() { return frames_.size(); }
const backtrace_frame_data_t* GetFrame(size_t frame_num) {
if (frame_num >= frames_.size()) {
return NULL;
}
return &frames_[frame_num];
}
typedef std::vector<backtrace_frame_data_t>::iterator iterator;
iterator begin() { return frames_.begin(); }
iterator end() { return frames_.end(); }
typedef std::vector<backtrace_frame_data_t>::const_iterator const_iterator;
const_iterator begin() const { return frames_.begin(); }
const_iterator end() const { return frames_.end(); }
BacktraceMap* GetMap() { return map_; }
protected:
Backtrace(BacktraceImpl* impl, pid_t pid, BacktraceMap* map);
virtual bool VerifyReadWordArgs(uintptr_t ptr, uint32_t* out_value);
bool BuildMap();
pid_t pid_;
pid_t tid_;
BacktraceMap* map_;
bool map_shared_;
std::vector<backtrace_frame_data_t> frames_;
BacktraceImpl* impl_;
friend class BacktraceImpl;
};
#endif // _BACKTRACE_BACKTRACE_H
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