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 char * logtag,int32_t ignoreDepth,int32_t maxDepth)33 CallStack::CallStack(const char* logtag, int32_t ignoreDepth, int32_t maxDepth) {
34 this->update(ignoreDepth+1, maxDepth);
35 this->dump(logtag);
36 }
37
CallStack(const CallStack & rhs)38 CallStack::CallStack(const CallStack& rhs) :
39 mCount(rhs.mCount) {
40 if (mCount) {
41 memcpy(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t));
42 }
43 }
44
~CallStack()45 CallStack::~CallStack() {
46 }
47
operator =(const CallStack & rhs)48 CallStack& CallStack::operator = (const CallStack& rhs) {
49 mCount = rhs.mCount;
50 if (mCount) {
51 memcpy(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t));
52 }
53 return *this;
54 }
55
operator ==(const CallStack & rhs) const56 bool CallStack::operator == (const CallStack& rhs) const {
57 if (mCount != rhs.mCount)
58 return false;
59 return !mCount || memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) == 0;
60 }
61
operator !=(const CallStack & rhs) const62 bool CallStack::operator != (const CallStack& rhs) const {
63 return !operator == (rhs);
64 }
65
operator <(const CallStack & rhs) const66 bool CallStack::operator < (const CallStack& rhs) const {
67 if (mCount != rhs.mCount)
68 return mCount < rhs.mCount;
69 return memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) < 0;
70 }
71
operator >=(const CallStack & rhs) const72 bool CallStack::operator >= (const CallStack& rhs) const {
73 return !operator < (rhs);
74 }
75
operator >(const CallStack & rhs) const76 bool CallStack::operator > (const CallStack& rhs) const {
77 if (mCount != rhs.mCount)
78 return mCount > rhs.mCount;
79 return memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) > 0;
80 }
81
operator <=(const CallStack & rhs) const82 bool CallStack::operator <= (const CallStack& rhs) const {
83 return !operator > (rhs);
84 }
85
operator [](int index) const86 const void* CallStack::operator [] (int index) const {
87 if (index >= int(mCount))
88 return 0;
89 return reinterpret_cast<const void*>(mStack[index].absolute_pc);
90 }
91
clear()92 void CallStack::clear() {
93 mCount = 0;
94 }
95
update(int32_t ignoreDepth,int32_t maxDepth)96 void CallStack::update(int32_t ignoreDepth, int32_t maxDepth) {
97 if (maxDepth > MAX_DEPTH) {
98 maxDepth = MAX_DEPTH;
99 }
100 ssize_t count = unwind_backtrace(mStack, ignoreDepth + 1, maxDepth);
101 mCount = count > 0 ? count : 0;
102 }
103
dump(const char * logtag,const char * prefix) const104 void CallStack::dump(const char* logtag, const char* prefix) const {
105 backtrace_symbol_t symbols[mCount];
106
107 get_backtrace_symbols(mStack, mCount, symbols);
108 for (size_t i = 0; i < mCount; i++) {
109 char line[MAX_BACKTRACE_LINE_LENGTH];
110 format_backtrace_line(i, &mStack[i], &symbols[i],
111 line, MAX_BACKTRACE_LINE_LENGTH);
112 ALOG(LOG_DEBUG, logtag, "%s%s",
113 prefix ? prefix : "",
114 line);
115 }
116 free_backtrace_symbols(symbols, mCount);
117 }
118
toString(const char * prefix) const119 String8 CallStack::toString(const char* prefix) const {
120 String8 str;
121 backtrace_symbol_t symbols[mCount];
122
123 get_backtrace_symbols(mStack, mCount, symbols);
124 for (size_t i = 0; i < mCount; i++) {
125 char line[MAX_BACKTRACE_LINE_LENGTH];
126 format_backtrace_line(i, &mStack[i], &symbols[i],
127 line, MAX_BACKTRACE_LINE_LENGTH);
128 if (prefix) {
129 str.append(prefix);
130 }
131 str.append(line);
132 str.append("\n");
133 }
134 free_backtrace_symbols(symbols, mCount);
135 return str;
136 }
137
138 }; // namespace android
139