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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 _LIBBACKTRACE_BACKTRACE_CURRENT_H
#define _LIBBACKTRACE_BACKTRACE_CURRENT_H
#include <stdint.h>
#include <sys/types.h>
#include <ucontext.h>
#include <backtrace/Backtrace.h>
// The signal used to cause a thread to dump the stack.
#if defined(__GLIBC__)
// In order to run the backtrace_tests on the host, we can't use
// the internal real time signals used by GLIBC. To avoid this,
// use SIGRTMIN for the signal to dump the stack.
#define THREAD_SIGNAL SIGRTMIN
#else
#define THREAD_SIGNAL (__SIGRTMIN+1)
#endif
class BacktraceMap;
class BacktraceCurrent : public Backtrace {
public:
BacktraceCurrent(pid_t pid, pid_t tid, BacktraceMap* map) : Backtrace(pid, tid, map) {}
virtual ~BacktraceCurrent() {}
size_t Read(uintptr_t addr, uint8_t* buffer, size_t bytes) override;
bool ReadWord(uintptr_t ptr, word_t* out_value) override;
bool Unwind(size_t num_ignore_frames, ucontext_t* ucontext) override;
protected:
bool DiscardFrame(const backtrace_frame_data_t& frame);
private:
bool UnwindThread(size_t num_ignore_frames);
virtual bool UnwindFromContext(size_t num_ignore_frames, ucontext_t* ucontext) = 0;
};
#endif // _LIBBACKTRACE_BACKTRACE_CURRENT_H
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