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/Printer.h>
20 #include <utils/Errors.h>
21 #include <utils/Log.h>
22
23 #include <backtrace/Backtrace.h>
24
25 #define CALLSTACK_WEAK // Don't generate weak definitions.
26 #include <utils/CallStack.h>
27
28 namespace android {
29
CallStack()30 CallStack::CallStack() {
31 }
32
CallStack(const char * logtag,int32_t ignoreDepth)33 CallStack::CallStack(const char* logtag, int32_t ignoreDepth) {
34 this->update(ignoreDepth+1);
35 this->log(logtag);
36 }
37
~CallStack()38 CallStack::~CallStack() {
39 }
40
update(int32_t ignoreDepth,pid_t tid)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
log(const char * logtag,android_LogPriority priority,const char * prefix) const53 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
dump(int fd,int indent,const char * prefix) const58 void CallStack::dump(int fd, int indent, const char* prefix) const {
59 FdPrinter printer(fd, indent, prefix);
60 print(printer);
61 }
62
toString(const char * prefix) const63 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
print(Printer & printer) const72 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 // The following four functions may be used via weak symbol references from libutils.
79 // Clients assume that if any of these symbols are available, then deleteStack() is.
80
81 #ifdef WEAKS_AVAILABLE
82
getCurrentInternal(int ignoreDepth)83 CallStack::CallStackUPtr CallStack::getCurrentInternal(int ignoreDepth) {
84 CallStack::CallStackUPtr stack(new CallStack());
85 stack->update(ignoreDepth + 1);
86 return stack;
87 }
88
logStackInternal(const char * logtag,const CallStack * stack,android_LogPriority priority)89 void CallStack::logStackInternal(const char* logtag, const CallStack* stack,
90 android_LogPriority priority) {
91 stack->log(logtag, priority);
92 }
93
stackToStringInternal(const char * prefix,const CallStack * stack)94 String8 CallStack::stackToStringInternal(const char* prefix, const CallStack* stack) {
95 return stack->toString(prefix);
96 }
97
deleteStack(CallStack * stack)98 void CallStack::deleteStack(CallStack* stack) {
99 delete stack;
100 }
101
102 #endif // WEAKS_AVAILABLE
103
104 }; // namespace android
105