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Christopher Ferris2c43cff2015-03-26 19:18:36 -07001/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef _LIBBACKTRACE_BACKTRACE_CURRENT_H
18#define _LIBBACKTRACE_BACKTRACE_CURRENT_H
19
20#include <stdint.h>
21#include <sys/types.h>
22#include <ucontext.h>
23
24#include <backtrace/Backtrace.h>
25
26// The signal used to cause a thread to dump the stack.
27#if defined(__GLIBC__)
28// In order to run the backtrace_tests on the host, we can't use
29// the internal real time signals used by GLIBC. To avoid this,
30// use SIGRTMIN for the signal to dump the stack.
31#define THREAD_SIGNAL SIGRTMIN
32#else
33#define THREAD_SIGNAL (__SIGRTMIN+1)
34#endif
35
36class BacktraceMap;
37
38class BacktraceCurrent : public Backtrace {
Christopher Ferris82f3bbd2017-03-14 15:22:26 -070039 public:
Christopher Ferris2c43cff2015-03-26 19:18:36 -070040 BacktraceCurrent(pid_t pid, pid_t tid, BacktraceMap* map) : Backtrace(pid, tid, map) {}
41 virtual ~BacktraceCurrent() {}
42
43 size_t Read(uintptr_t addr, uint8_t* buffer, size_t bytes) override;
44
45 bool ReadWord(uintptr_t ptr, word_t* out_value) override;
46
47 bool Unwind(size_t num_ignore_frames, ucontext_t* ucontext) override;
48
Christopher Ferris82f3bbd2017-03-14 15:22:26 -070049 protected:
Christopher Ferrisca09ce92015-03-31 17:28:22 -070050 bool DiscardFrame(const backtrace_frame_data_t& frame);
51
Christopher Ferris82f3bbd2017-03-14 15:22:26 -070052 private:
Christopher Ferris2c43cff2015-03-26 19:18:36 -070053 bool UnwindThread(size_t num_ignore_frames);
54
55 virtual bool UnwindFromContext(size_t num_ignore_frames, ucontext_t* ucontext) = 0;
56};
57
58#endif // _LIBBACKTRACE_BACKTRACE_CURRENT_H