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 <utils/CallStack.h>
20 #include <utils/Printer.h>
21 #include <utils/Errors.h>
22 #include <utils/Log.h>
23 #include <UniquePtr.h>
24
25 #include <backtrace/Backtrace.h>
26
27 namespace android {
28
CallStack()29 CallStack::CallStack() {
30 }
31
CallStack(const char * logtag,int32_t ignoreDepth)32 CallStack::CallStack(const char* logtag, int32_t ignoreDepth) {
33 this->update(ignoreDepth+1);
34 this->log(logtag);
35 }
36
~CallStack()37 CallStack::~CallStack() {
38 }
39
update(int32_t ignoreDepth,pid_t tid)40 void CallStack::update(int32_t ignoreDepth, pid_t tid) {
41 mFrameLines.clear();
42
43 UniquePtr<Backtrace> backtrace(Backtrace::Create(BACKTRACE_CURRENT_PROCESS, tid));
44 if (!backtrace->Unwind(ignoreDepth)) {
45 ALOGW("%s: Failed to unwind callstack.", __FUNCTION__);
46 }
47 for (size_t i = 0; i < backtrace->NumFrames(); i++) {
48 mFrameLines.push_back(String8(backtrace->FormatFrameData(i).c_str()));
49 }
50 }
51
log(const char * logtag,android_LogPriority priority,const char * prefix) const52 void CallStack::log(const char* logtag, android_LogPriority priority, const char* prefix) const {
53 LogPrinter printer(logtag, priority, prefix, /*ignoreBlankLines*/false);
54 print(printer);
55 }
56
dump(int fd,int indent,const char * prefix) const57 void CallStack::dump(int fd, int indent, const char* prefix) const {
58 FdPrinter printer(fd, indent, prefix);
59 print(printer);
60 }
61
toString(const char * prefix) const62 String8 CallStack::toString(const char* prefix) const {
63 String8 str;
64
65 String8Printer printer(&str, prefix);
66 print(printer);
67
68 return str;
69 }
70
print(Printer & printer) const71 void CallStack::print(Printer& printer) const {
72 for (size_t i = 0; i < mFrameLines.size(); i++) {
73 printer.printLine(mFrameLines[i]);
74 }
75 }
76
77 }; // namespace android
78