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 <string.h>
20
21 #include <utils/Log.h>
22 #include <utils/Errors.h>
23 #include <utils/CallStack.h>
24 #include <corkscrew/backtrace.h>
25
26 /*****************************************************************************/
27 namespace android {
28
CallStack()29 CallStack::CallStack() :
30 mCount(0) {
31 }
32
CallStack(const CallStack & rhs)33 CallStack::CallStack(const CallStack& rhs) :
34 mCount(rhs.mCount) {
35 if (mCount) {
36 memcpy(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t));
37 }
38 }
39
~CallStack()40 CallStack::~CallStack() {
41 }
42
operator =(const CallStack & rhs)43 CallStack& CallStack::operator = (const CallStack& rhs) {
44 mCount = rhs.mCount;
45 if (mCount) {
46 memcpy(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t));
47 }
48 return *this;
49 }
50
operator ==(const CallStack & rhs) const51 bool CallStack::operator == (const CallStack& rhs) const {
52 if (mCount != rhs.mCount)
53 return false;
54 return !mCount || memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) == 0;
55 }
56
operator !=(const CallStack & rhs) const57 bool CallStack::operator != (const CallStack& rhs) const {
58 return !operator == (rhs);
59 }
60
operator <(const CallStack & rhs) const61 bool CallStack::operator < (const CallStack& rhs) const {
62 if (mCount != rhs.mCount)
63 return mCount < rhs.mCount;
64 return memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) < 0;
65 }
66
operator >=(const CallStack & rhs) const67 bool CallStack::operator >= (const CallStack& rhs) const {
68 return !operator < (rhs);
69 }
70
operator >(const CallStack & rhs) const71 bool CallStack::operator > (const CallStack& rhs) const {
72 if (mCount != rhs.mCount)
73 return mCount > rhs.mCount;
74 return memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) > 0;
75 }
76
operator <=(const CallStack & rhs) const77 bool CallStack::operator <= (const CallStack& rhs) const {
78 return !operator > (rhs);
79 }
80
operator [](int index) const81 const void* CallStack::operator [] (int index) const {
82 if (index >= int(mCount))
83 return 0;
84 return reinterpret_cast<const void*>(mStack[index].absolute_pc);
85 }
86
clear()87 void CallStack::clear() {
88 mCount = 0;
89 }
90
update(int32_t ignoreDepth,int32_t maxDepth)91 void CallStack::update(int32_t ignoreDepth, int32_t maxDepth) {
92 if (maxDepth > MAX_DEPTH) {
93 maxDepth = MAX_DEPTH;
94 }
95 ssize_t count = unwind_backtrace(mStack, ignoreDepth + 1, maxDepth);
96 mCount = count > 0 ? count : 0;
97 }
98
dump(const char * prefix) const99 void CallStack::dump(const char* prefix) const {
100 backtrace_symbol_t symbols[mCount];
101
102 get_backtrace_symbols(mStack, mCount, symbols);
103 for (size_t i = 0; i < mCount; i++) {
104 char line[MAX_BACKTRACE_LINE_LENGTH];
105 format_backtrace_line(i, &mStack[i], &symbols[i],
106 line, MAX_BACKTRACE_LINE_LENGTH);
107 ALOGD("%s%s", prefix, line);
108 }
109 free_backtrace_symbols(symbols, mCount);
110 }
111
toString(const char * prefix) const112 String8 CallStack::toString(const char* prefix) const {
113 String8 str;
114 backtrace_symbol_t symbols[mCount];
115
116 get_backtrace_symbols(mStack, mCount, symbols);
117 for (size_t i = 0; i < mCount; i++) {
118 char line[MAX_BACKTRACE_LINE_LENGTH];
119 format_backtrace_line(i, &mStack[i], &symbols[i],
120 line, MAX_BACKTRACE_LINE_LENGTH);
121 str.append(prefix);
122 str.append(line);
123 str.append("\n");
124 }
125 free_backtrace_symbols(symbols, mCount);
126 return str;
127 }
128
129 }; // namespace android
130