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 <log/log.h>
22
23 #include <unwindstack/AndroidUnwinder.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 if (ignoreDepth < 0) {
43 ignoreDepth = 0;
44 }
45
46 mFrameLines.clear();
47
48 unwindstack::AndroidLocalUnwinder unwinder;
49 unwindstack::AndroidUnwinderData data;
50 std::optional<pid_t> tid_val;
51 if (tid != -1) {
52 tid_val = tid;
53 }
54 if (!unwinder.Unwind(tid_val, data)) {
55 ALOGW("%s: Failed to unwind callstack: %s", __FUNCTION__, data.GetErrorString().c_str());
56 }
57 for (size_t i = ignoreDepth; i < data.frames.size(); i++) {
58 auto& frame = data.frames[i];
59 frame.num -= ignoreDepth;
60 mFrameLines.push_back(String8(unwinder.FormatFrame(frame).c_str()));
61 }
62 }
63
log(const char * logtag,android_LogPriority priority,const char * prefix) const64 void CallStack::log(const char* logtag, android_LogPriority priority, const char* prefix) const {
65 LogPrinter printer(logtag, priority, prefix, /*ignoreBlankLines*/false);
66 print(printer);
67 }
68
dump(int fd,int indent,const char * prefix) const69 void CallStack::dump(int fd, int indent, const char* prefix) const {
70 FdPrinter printer(fd, indent, prefix);
71 print(printer);
72 }
73
toString(const char * prefix) const74 String8 CallStack::toString(const char* prefix) const {
75 String8 str;
76
77 String8Printer printer(&str, prefix);
78 print(printer);
79
80 return str;
81 }
82
print(Printer & printer) const83 void CallStack::print(Printer& printer) const {
84 for (size_t i = 0; i < mFrameLines.size(); i++) {
85 printer.printLine(mFrameLines[i].c_str());
86 }
87 }
88
89 // The following four functions may be used via weak symbol references from libutils.
90 // Clients assume that if any of these symbols are available, then deleteStack() is.
91
92 // Apple and Windows does not support this, so only compile on other platforms.
93 #if !defined(__APPLE__) && !defined(_WIN32)
94
getCurrentInternal(int ignoreDepth)95 CallStack::CallStackUPtr CallStack::getCurrentInternal(int ignoreDepth) {
96 CallStack::CallStackUPtr stack(new CallStack());
97 stack->update(ignoreDepth + 1);
98 return stack;
99 }
100
logStackInternal(const char * logtag,const CallStack * stack,android_LogPriority priority)101 void CallStack::logStackInternal(const char* logtag, const CallStack* stack,
102 android_LogPriority priority) {
103 stack->log(logtag, priority);
104 }
105
stackToStringInternal(const char * prefix,const CallStack * stack)106 String8 CallStack::stackToStringInternal(const char* prefix, const CallStack* stack) {
107 return stack->toString(prefix);
108 }
109
deleteStack(CallStack * stack)110 void CallStack::deleteStack(CallStack* stack) {
111 delete stack;
112 }
113
114 #endif // !defined(__APPLE__) && !defined(_WIN32)
115
116 }; // namespace android
117