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 "read_dex_file.h"
18
19 #include <fcntl.h>
20
21 #include <algorithm>
22 #include <functional>
23 #include <iterator>
24 #include <string>
25 #include <utility>
26 #include <vector>
27
28 #include <android-base/logging.h>
29 #include <android-base/mapped_file.h>
30 #include <android-base/unique_fd.h>
31 #include <art_api/dex_file_support.h>
32
33 #include "utils.h"
34
35 namespace simpleperf {
36
ReadSymbols(art_api::dex::DexFile & dex_file,uint64_t file_offset,const std::function<void (DexFileSymbol *)> & symbol_cb)37 static void ReadSymbols(art_api::dex::DexFile& dex_file, uint64_t file_offset,
38 const std::function<void(DexFileSymbol*)>& symbol_cb) {
39 auto callback = [&](const art_api::dex::DexFile::Method& method) {
40 size_t name_size, code_size;
41 const char* name = method.GetQualifiedName(/*with_params=*/false, &name_size);
42 size_t offset = method.GetCodeOffset(&code_size);
43 DexFileSymbol symbol{std::string_view(name, name_size), file_offset + offset, code_size};
44 symbol_cb(&symbol);
45 };
46 dex_file.ForEachMethod(callback);
47 }
48
ReadSymbolsFromDexFileInMemory(void * addr,uint64_t size,const std::string & debug_filename,const std::vector<uint64_t> & dex_file_offsets,const std::function<void (DexFileSymbol *)> & symbol_callback)49 bool ReadSymbolsFromDexFileInMemory(void* addr, uint64_t size, const std::string& debug_filename,
50 const std::vector<uint64_t>& dex_file_offsets,
51 const std::function<void(DexFileSymbol*)>& symbol_callback) {
52 for (uint64_t file_offset : dex_file_offsets) {
53 size_t max_file_size;
54 if (__builtin_sub_overflow(size, file_offset, &max_file_size)) {
55 LOG(WARNING) << "failed to read dex file symbols from " << debug_filename << "(offset "
56 << file_offset << ")";
57 return false;
58 }
59 uint8_t* file_addr = static_cast<uint8_t*>(addr) + file_offset;
60 std::unique_ptr<art_api::dex::DexFile> dex_file;
61 art_api::dex::DexFile::Error error_msg =
62 art_api::dex::DexFile::Create(file_addr, max_file_size, nullptr, "", &dex_file);
63 if (dex_file == nullptr) {
64 LOG(WARNING) << "failed to read dex file symbols from " << debug_filename << "(offset "
65 << file_offset << "): " << error_msg.ToString();
66 return false;
67 }
68 ReadSymbols(*dex_file, file_offset, symbol_callback);
69 }
70 return true;
71 }
72
ReadSymbolsFromDexFile(const std::string & file_path,const std::vector<uint64_t> & dex_file_offsets,const std::function<void (DexFileSymbol *)> & symbol_callback)73 bool ReadSymbolsFromDexFile(const std::string& file_path,
74 const std::vector<uint64_t>& dex_file_offsets,
75 const std::function<void(DexFileSymbol*)>& symbol_callback) {
76 android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(file_path.c_str(), O_RDONLY | O_CLOEXEC)));
77 if (fd == -1) {
78 return false;
79 }
80 size_t file_size = GetFileSize(file_path);
81 if (file_size == 0) {
82 return false;
83 }
84 std::unique_ptr<android::base::MappedFile> map;
85 map = android::base::MappedFile::FromFd(fd, 0, file_size, PROT_READ);
86 if (map == nullptr) {
87 return false;
88 }
89 return ReadSymbolsFromDexFileInMemory(map->data(), file_size, file_path, dex_file_offsets,
90 symbol_callback);
91 }
92
93 } // namespace simpleperf
94