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 <memory>
20
21#include <utils/CallStack.h>
22#include <utils/Printer.h>
23#include <utils/Errors.h>
24#include <utils/Log.h>
25
26#include <backtrace/Backtrace.h>
27
28namespace android {
29
30CallStack::CallStack() {
31}
32
33CallStack::CallStack(const char* logtag, int32_t ignoreDepth) {
34    this->update(ignoreDepth+1);
35    this->log(logtag);
36}
37
38CallStack::~CallStack() {
39}
40
41void CallStack::update(int32_t ignoreDepth, pid_t tid) {
42    mFrameLines.clear();
43
44    std::unique_ptr<Backtrace> backtrace(Backtrace::Create(BACKTRACE_CURRENT_PROCESS, tid));
45    if (!backtrace->Unwind(ignoreDepth)) {
46        ALOGW("%s: Failed to unwind callstack.", __FUNCTION__);
47    }
48    for (size_t i = 0; i < backtrace->NumFrames(); i++) {
49      mFrameLines.push_back(String8(backtrace->FormatFrameData(i).c_str()));
50    }
51}
52
53void CallStack::log(const char* logtag, android_LogPriority priority, const char* prefix) const {
54    LogPrinter printer(logtag, priority, prefix, /*ignoreBlankLines*/false);
55    print(printer);
56}
57
58void CallStack::dump(int fd, int indent, const char* prefix) const {
59    FdPrinter printer(fd, indent, prefix);
60    print(printer);
61}
62
63String8 CallStack::toString(const char* prefix) const {
64    String8 str;
65
66    String8Printer printer(&str, prefix);
67    print(printer);
68
69    return str;
70}
71
72void CallStack::print(Printer& printer) const {
73    for (size_t i = 0; i < mFrameLines.size(); i++) {
74        printer.printLine(mFrameLines[i]);
75    }
76}
77
78}; // namespace android
79