1 /*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "ecmascript/platform/backtrace.h"
17
18 #include <dlfcn.h>
19 #include <iomanip>
20 #include <ios>
21 #include <cstring>
22 #include <map>
23 #include <unwind.h>
24
25 #include "ecmascript/log_wrapper.h"
26 #include "ecmascript/mem/mem.h"
27
28 namespace panda::ecmascript {
29 static const std::string LIB_UNWIND_SO_NAME = "libunwind.so";
30 static const std::string LIB_UNWIND_Z_SO_NAME = "libunwind.z.so";
31 static const int MAX_STACK_SIZE = 16;
32 static const int ALIGN_WIDTH = 2;
33
34 using UnwBackTraceFunc = int (*)(void**, int);
35
36 static std::map<void *, Dl_info> stackInfoCache;
37
Backtrace(std::ostringstream & stack,bool enableCache)38 void Backtrace(std::ostringstream &stack, bool enableCache)
39 {
40 static UnwBackTraceFunc unwBackTrace = nullptr;
41 if (!unwBackTrace) {
42 void *handle = dlopen(LIB_UNWIND_SO_NAME.c_str(), RTLD_NOW);
43 if (handle == nullptr) {
44 handle = dlopen(LIB_UNWIND_Z_SO_NAME.c_str(), RTLD_NOW);
45 if (handle == nullptr) {
46 LOG_ECMA(INFO) << "dlopen libunwind.so failed";
47 return;
48 }
49 }
50 unwBackTrace = reinterpret_cast<UnwBackTraceFunc>(dlsym(handle, "unw_backtrace"));
51 if (unwBackTrace == nullptr) {
52 LOG_ECMA(INFO) << "dlsym unw_backtrace failed";
53 return;
54 }
55 }
56
57 void *buffer[MAX_STACK_SIZE] = { nullptr };
58 int level = unwBackTrace(reinterpret_cast<void**>(&buffer), MAX_STACK_SIZE);
59 stack << "=====================Backtrace========================";
60 for (int i = 1; i < level; i++) {
61 Dl_info info;
62 auto iter = stackInfoCache.find(buffer[i]);
63 if (enableCache && iter != stackInfoCache.end()) {
64 info = iter->second;
65 } else {
66 if (!dladdr(buffer[i], &info)) {
67 break;
68 }
69 if (enableCache) {
70 stackInfoCache.emplace(buffer[i], info);
71 }
72 }
73 const char *file = info.dli_fname ? info.dli_fname : "";
74 uintptr_t offset = info.dli_fbase ? ToUintPtr(buffer[i]) - ToUintPtr(info.dli_fbase) : 0;
75 stack << std::endl << "#" << std::setw(ALIGN_WIDTH) << std::dec << i << ": " <<
76 file << "(" << "+" << std::hex << offset << ")";
77 }
78 }
79 } // namespace panda::ecmascript
80