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