1 /* 2 * Copyright (C) 2015 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 SIMPLE_PERF_OFFLINE_UNWINDER_H_ 18 #define SIMPLE_PERF_OFFLINE_UNWINDER_H_ 19 20 #include <memory> 21 #include <vector> 22 #include <unordered_map> 23 24 #include "perf_regs.h" 25 26 #include <backtrace/BacktraceMap.h> 27 28 namespace simpleperf { 29 struct ThreadEntry; 30 31 struct UnwindingResult { 32 // time used for unwinding, in ns. 33 uint64_t used_time; 34 enum { 35 UNKNOWN_REASON, 36 EXCEED_MAX_FRAMES_LIMIT, 37 ACCESS_REG_FAILED, 38 ACCESS_STACK_FAILED, 39 ACCESS_MEM_FAILED, 40 FIND_PROC_INFO_FAILED, 41 EXECUTE_DWARF_INSTRUCTION_FAILED, 42 DIFFERENT_ARCH, 43 MAP_MISSING, 44 } stop_reason; 45 union { 46 // for ACCESS_REG_FAILED 47 uint64_t regno; 48 // for ACCESS_MEM_FAILED and ACCESS_STACK_FAILED 49 uint64_t addr; 50 } stop_info; 51 uint64_t stack_start; 52 uint64_t stack_end; 53 }; 54 55 class OfflineUnwinder { 56 public: 57 OfflineUnwinder(bool collect_stat); 58 59 bool UnwindCallChain(const ThreadEntry& thread, const RegSet& regs, const char* stack, 60 size_t stack_size, std::vector<uint64_t>* ips, std::vector<uint64_t>* sps); 61 62 bool HasStat() const { 63 return collect_stat_; 64 } 65 66 const UnwindingResult& GetUnwindingResult() const { 67 return unwinding_result_; 68 } 69 70 private: 71 bool collect_stat_; 72 UnwindingResult unwinding_result_; 73 74 // Cache of the most recently used map. 75 struct CachedMap { 76 uint64_t version = 0u; 77 std::unique_ptr<BacktraceMap> map; 78 }; 79 // use unused attribute to pass mac build. 80 std::unordered_map<pid_t, CachedMap> cached_maps_ __attribute__((unused)); 81 }; 82 83 } // namespace simpleperf 84 85 #endif // SIMPLE_PERF_OFFLINE_UNWINDER_H_ 86
