1 /* 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 36 class BacktraceMap; 37 38 class BacktraceCurrent : public Backtrace { 39 public: BacktraceCurrent(pid_t pid,pid_t tid,BacktraceMap * map)40 BacktraceCurrent(pid_t pid, pid_t tid, BacktraceMap* map) : Backtrace(pid, tid, map) {} ~BacktraceCurrent()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 49 protected: 50 bool DiscardFrame(const backtrace_frame_data_t& frame); 51 52 private: 53 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 59