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
21#include <memory>
22
23#include <utils/Printer.h>
24#include <utils/Errors.h>
25#include <utils/Log.h>
26
27#include <backtrace/Backtrace.h>
28
29namespace android {
30
31CallStack::CallStack() {
32}
33
34CallStack::CallStack(const char* logtag, int32_t ignoreDepth) {
35    this->update(ignoreDepth+1);
36    this->log(logtag);
37}
38
39CallStack::~CallStack() {
40}
41
42void CallStack::update(int32_t ignoreDepth, pid_t tid) {
43    mFrameLines.clear();
44
45    std::unique_ptr<Backtrace> backtrace(Backtrace::Create(BACKTRACE_CURRENT_PROCESS, tid));
46    if (!backtrace->Unwind(ignoreDepth)) {
47        ALOGW("%s: Failed to unwind callstack.", __FUNCTION__);
48    }
49    for (size_t i = 0; i < backtrace->NumFrames(); i++) {
50      mFrameLines.push_back(String8(backtrace->FormatFrameData(i).c_str()));
51    }
52}
53
54void CallStack::log(const char* logtag, android_LogPriority priority, const char* prefix) const {
55    LogPrinter printer(logtag, priority, prefix, /*ignoreBlankLines*/false);
56    print(printer);
57}
58
59void CallStack::dump(int fd, int indent, const char* prefix) const {
60    FdPrinter printer(fd, indent, prefix);
61    print(printer);
62}
63
64String8 CallStack::toString(const char* prefix) const {
65    String8 str;
66
67    String8Printer printer(&str, prefix);
68    print(printer);
69
70    return str;
71}
72
73void CallStack::print(Printer& printer) const {
74    for (size_t i = 0; i < mFrameLines.size(); i++) {
75        printer.printLine(mFrameLines[i]);
76    }
77}
78
79}; // namespace android
80