1 /* 2 * Copyright (C) 2007 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 #define LOG_TAG "CallStack" 18 19 #include <memory> 20 21 #include <utils/CallStack.h> 22 #include <utils/Printer.h> 23 #include <utils/Errors.h> 24 #include <utils/Log.h> 25 26 #include <backtrace/Backtrace.h> 27 28 namespace android { 29 30 CallStack::CallStack() { 31 } 32 33 CallStack::CallStack(const char* logtag, int32_t ignoreDepth) { 34 this->update(ignoreDepth+1); 35 this->log(logtag); 36 } 37 38 CallStack::~CallStack() { 39 } 40 41 void CallStack::update(int32_t ignoreDepth, pid_t tid) { 42 mFrameLines.clear(); 43 44 std::unique_ptr<Backtrace> backtrace(Backtrace::Create(BACKTRACE_CURRENT_PROCESS, tid)); 45 if (!backtrace->Unwind(ignoreDepth)) { 46 ALOGW("%s: Failed to unwind callstack.", __FUNCTION__); 47 } 48 for (size_t i = 0; i < backtrace->NumFrames(); i++) { 49 mFrameLines.push_back(String8(backtrace->FormatFrameData(i).c_str())); 50 } 51 } 52 53 void CallStack::log(const char* logtag, android_LogPriority priority, const char* prefix) const { 54 LogPrinter printer(logtag, priority, prefix, /*ignoreBlankLines*/false); 55 print(printer); 56 } 57 58 void CallStack::dump(int fd, int indent, const char* prefix) const { 59 FdPrinter printer(fd, indent, prefix); 60 print(printer); 61 } 62 63 String8 CallStack::toString(const char* prefix) const { 64 String8 str; 65 66 String8Printer printer(&str, prefix); 67 print(printer); 68 69 return str; 70 } 71 72 void CallStack::print(Printer& printer) const { 73 for (size_t i = 0; i < mFrameLines.size(); i++) { 74 printer.printLine(mFrameLines[i]); 75 } 76 } 77 78 }; // namespace android 79
