1 /*
2 * Copyright (C) 2018 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 #include <sys/mman.h>
19 #include <sys/stat.h>
20 #include <sys/types.h>
21 #include <unistd.h>
22
23 #include <memory>
24
25 #define LOG_TAG "unwind"
26 #include <log/log.h>
27
28 #include <android-base/unique_fd.h>
29 #include <art_api/dex_file_support.h>
30
31 #include <unwindstack/MapInfo.h>
32 #include <unwindstack/Memory.h>
33
34 #include "DexFile.h"
35
36 namespace unwindstack {
37
CheckDexSupport()38 static bool CheckDexSupport() {
39 if (std::string err_msg; !art_api::dex::TryLoadLibdexfileExternal(&err_msg)) {
40 ALOGW("Failed to initialize DEX file support: %s", err_msg.c_str());
41 return false;
42 }
43 return true;
44 }
45
HasDexSupport()46 static bool HasDexSupport() {
47 static bool has_dex_support = CheckDexSupport();
48 return has_dex_support;
49 }
50
Create(uint64_t dex_file_offset_in_memory,Memory * memory,MapInfo * info)51 std::unique_ptr<DexFile> DexFile::Create(uint64_t dex_file_offset_in_memory, Memory* memory,
52 MapInfo* info) {
53 if (!info->name.empty()) {
54 std::unique_ptr<DexFile> dex_file =
55 DexFileFromFile::Create(dex_file_offset_in_memory - info->start + info->offset, info->name);
56 if (dex_file) {
57 return dex_file;
58 }
59 }
60 return DexFileFromMemory::Create(dex_file_offset_in_memory, memory, info->name);
61 }
62
GetMethodInformation(uint64_t dex_offset,std::string * method_name,uint64_t * method_offset)63 bool DexFile::GetMethodInformation(uint64_t dex_offset, std::string* method_name,
64 uint64_t* method_offset) {
65 art_api::dex::MethodInfo method_info = GetMethodInfoForOffset(dex_offset, false);
66 if (method_info.offset == 0) {
67 return false;
68 }
69 *method_name = method_info.name;
70 *method_offset = dex_offset - method_info.offset;
71 return true;
72 }
73
Create(uint64_t dex_file_offset_in_file,const std::string & file)74 std::unique_ptr<DexFileFromFile> DexFileFromFile::Create(uint64_t dex_file_offset_in_file,
75 const std::string& file) {
76 if (UNLIKELY(!HasDexSupport())) {
77 return nullptr;
78 }
79
80 android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(file.c_str(), O_RDONLY | O_CLOEXEC)));
81 if (fd == -1) {
82 return nullptr;
83 }
84
85 std::string error_msg;
86 std::unique_ptr<art_api::dex::DexFile> art_dex_file =
87 OpenFromFd(fd, dex_file_offset_in_file, file, &error_msg);
88 if (art_dex_file == nullptr) {
89 return nullptr;
90 }
91
92 return std::unique_ptr<DexFileFromFile>(new DexFileFromFile(art_dex_file));
93 }
94
Create(uint64_t dex_file_offset_in_memory,Memory * memory,const std::string & name)95 std::unique_ptr<DexFileFromMemory> DexFileFromMemory::Create(uint64_t dex_file_offset_in_memory,
96 Memory* memory,
97 const std::string& name) {
98 if (UNLIKELY(!HasDexSupport())) {
99 return nullptr;
100 }
101
102 std::vector<uint8_t> backing_memory;
103
104 for (size_t size = 0;;) {
105 std::string error_msg;
106 std::unique_ptr<art_api::dex::DexFile> art_dex_file =
107 OpenFromMemory(backing_memory.data(), &size, name, &error_msg);
108
109 if (art_dex_file != nullptr) {
110 return std::unique_ptr<DexFileFromMemory>(
111 new DexFileFromMemory(art_dex_file, std::move(backing_memory)));
112 }
113
114 if (!error_msg.empty()) {
115 return nullptr;
116 }
117
118 backing_memory.resize(size);
119 if (!memory->ReadFully(dex_file_offset_in_memory, backing_memory.data(),
120 backing_memory.size())) {
121 return nullptr;
122 }
123 }
124 }
125
126 } // namespace unwindstack
127