1 /*
2 * Copyright (C) 2015 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 #include <stdint.h>
18
19 #include <deque>
20 #include <vector>
21 #include <utility>
22
23 #include <unwindstack/LocalUnwinder.h>
24
25 #include "backtrace.h"
26 #include "backtrace_fake.h"
27 #include "debug_log.h"
28
29 static std::deque<std::vector<uintptr_t>> g_fake_backtrace;
30
backtrace_fake_clear_all()31 void backtrace_fake_clear_all() {
32 g_fake_backtrace.clear();
33 }
34
backtrace_fake_add(const std::vector<uintptr_t> & ips)35 void backtrace_fake_add(const std::vector<uintptr_t>& ips) {
36 g_fake_backtrace.push_back(ips);
37 }
38
backtrace_startup()39 void backtrace_startup() {
40 }
41
backtrace_shutdown()42 void backtrace_shutdown() {
43 }
44
backtrace_get(uintptr_t * frames,size_t frame_num)45 size_t backtrace_get(uintptr_t* frames, size_t frame_num) {
46 if (frame_num == 0 || g_fake_backtrace.size() == 0) {
47 return 0;
48 }
49
50 size_t ips_size = g_fake_backtrace[0].size();
51 size_t total_frames = (frame_num < ips_size) ? frame_num : ips_size;
52 memcpy(frames, g_fake_backtrace[0].data(), sizeof(uintptr_t) * total_frames);
53 g_fake_backtrace.pop_front();
54 return total_frames;
55 }
56
backtrace_log(const uintptr_t * frames,size_t frame_count)57 void backtrace_log(const uintptr_t* frames, size_t frame_count) {
58 for (size_t i = 0; i < frame_count; i++) {
59 error_log(" #%02zd pc %p", i, reinterpret_cast<void*>(frames[i]));
60 }
61 }
62
63 static std::deque<std::vector<unwindstack::LocalFrameData>> g_fake_local_frame_data;
64
BacktraceUnwindFakeClearAll()65 void BacktraceUnwindFakeClearAll() {
66 g_fake_local_frame_data.clear();
67 }
68
BacktraceUnwindFake(const std::vector<unwindstack::LocalFrameData> & frames)69 void BacktraceUnwindFake(const std::vector<unwindstack::LocalFrameData>& frames) {
70 g_fake_local_frame_data.push_back(frames);
71 }
72
Unwind(std::vector<uintptr_t> * frames,std::vector<unwindstack::LocalFrameData> * info,size_t)73 bool Unwind(std::vector<uintptr_t>* frames, std::vector<unwindstack::LocalFrameData>* info, size_t) {
74 if (g_fake_local_frame_data.empty()) {
75 return false;
76 }
77
78 *info = g_fake_local_frame_data.front();
79 g_fake_local_frame_data.pop_front();
80 frames->clear();
81 for (const auto& frame : *info) {
82 frames->push_back(frame.pc);
83 }
84
85 return true;
86 }
87
UnwindLog(const std::vector<unwindstack::LocalFrameData> &)88 void UnwindLog(const std::vector<unwindstack::LocalFrameData>& /*frame_info*/) {
89 }
90