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 <corkscrew/backtrace.h>
24
25 namespace android {
26
CallStack()27 CallStack::CallStack() :
28 mCount(0) {
29 }
30
CallStack(const char * logtag,int32_t ignoreDepth,int32_t maxDepth)31 CallStack::CallStack(const char* logtag, int32_t ignoreDepth, int32_t maxDepth) {
32 this->update(ignoreDepth+1, maxDepth, CURRENT_THREAD);
33 this->log(logtag);
34 }
35
CallStack(const CallStack & rhs)36 CallStack::CallStack(const CallStack& rhs) :
37 mCount(rhs.mCount) {
38 if (mCount) {
39 memcpy(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t));
40 }
41 }
42
~CallStack()43 CallStack::~CallStack() {
44 }
45
operator =(const CallStack & rhs)46 CallStack& CallStack::operator = (const CallStack& rhs) {
47 mCount = rhs.mCount;
48 if (mCount) {
49 memcpy(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t));
50 }
51 return *this;
52 }
53
operator ==(const CallStack & rhs) const54 bool CallStack::operator == (const CallStack& rhs) const {
55 if (mCount != rhs.mCount)
56 return false;
57 return !mCount || memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) == 0;
58 }
59
operator !=(const CallStack & rhs) const60 bool CallStack::operator != (const CallStack& rhs) const {
61 return !operator == (rhs);
62 }
63
operator <(const CallStack & rhs) const64 bool CallStack::operator < (const CallStack& rhs) const {
65 if (mCount != rhs.mCount)
66 return mCount < rhs.mCount;
67 return memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) < 0;
68 }
69
operator >=(const CallStack & rhs) const70 bool CallStack::operator >= (const CallStack& rhs) const {
71 return !operator < (rhs);
72 }
73
operator >(const CallStack & rhs) const74 bool CallStack::operator > (const CallStack& rhs) const {
75 if (mCount != rhs.mCount)
76 return mCount > rhs.mCount;
77 return memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) > 0;
78 }
79
operator <=(const CallStack & rhs) const80 bool CallStack::operator <= (const CallStack& rhs) const {
81 return !operator > (rhs);
82 }
83
operator [](int index) const84 const void* CallStack::operator [] (int index) const {
85 if (index >= int(mCount))
86 return 0;
87 return reinterpret_cast<const void*>(mStack[index].absolute_pc);
88 }
89
clear()90 void CallStack::clear() {
91 mCount = 0;
92 }
93
update(int32_t ignoreDepth,int32_t maxDepth,pid_t tid)94 void CallStack::update(int32_t ignoreDepth, int32_t maxDepth, pid_t tid) {
95 if (maxDepth > MAX_DEPTH) {
96 maxDepth = MAX_DEPTH;
97 }
98 ssize_t count;
99
100 if (tid >= 0) {
101 count = unwind_backtrace_thread(tid, mStack, ignoreDepth + 1, maxDepth);
102 } else if (tid == CURRENT_THREAD) {
103 count = unwind_backtrace(mStack, ignoreDepth + 1, maxDepth);
104 } else {
105 ALOGE("%s: Invalid tid specified (%d)", __FUNCTION__, tid);
106 count = 0;
107 }
108
109 mCount = count > 0 ? count : 0;
110 }
111
log(const char * logtag,android_LogPriority priority,const char * prefix) const112 void CallStack::log(const char* logtag, android_LogPriority priority, const char* prefix) const {
113 LogPrinter printer(logtag, priority, prefix, /*ignoreBlankLines*/false);
114 print(printer);
115 }
116
dump(int fd,int indent,const char * prefix) const117 void CallStack::dump(int fd, int indent, const char* prefix) const {
118 FdPrinter printer(fd, indent, prefix);
119 print(printer);
120 }
121
toString(const char * prefix) const122 String8 CallStack::toString(const char* prefix) const {
123 String8 str;
124
125 String8Printer printer(&str, prefix);
126 print(printer);
127
128 return str;
129 }
130
print(Printer & printer) const131 void CallStack::print(Printer& printer) const {
132 backtrace_symbol_t symbols[mCount];
133
134 get_backtrace_symbols(mStack, mCount, symbols);
135 for (size_t i = 0; i < mCount; i++) {
136 char line[MAX_BACKTRACE_LINE_LENGTH];
137 format_backtrace_line(i, &mStack[i], &symbols[i],
138 line, MAX_BACKTRACE_LINE_LENGTH);
139 printer.printLine(line);
140 }
141 free_backtrace_symbols(symbols, mCount);
142 }
143
144 }; // namespace android
145