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 <iterator>
23 #include <string>
24 #include <utility>
25 #include <vector>
26
27 #include <android-base/logging.h>
28 #include <android-base/mapped_file.h>
29 #include <android-base/unique_fd.h>
30 #include <art_api/dex_file_support.h>
31
32 #include "utils.h"
33
34 namespace simpleperf {
35
ReadSymbols(const std::vector<uint64_t> & dex_file_offsets,const std::function<std::unique_ptr<art_api::dex::DexFile> (uint64_t offset)> & open_file_cb,const std::function<void (DexFileSymbol *)> & symbol_cb)36 static bool ReadSymbols(
37 const std::vector<uint64_t>& dex_file_offsets,
38 const std::function<std::unique_ptr<art_api::dex::DexFile>(uint64_t offset)>& open_file_cb,
39 const std::function<void(DexFileSymbol*)>& symbol_cb) {
40 for (uint64_t dex_offset : dex_file_offsets) {
41 std::unique_ptr<art_api::dex::DexFile> dex_file = open_file_cb(dex_offset);
42 if (dex_file == nullptr) {
43 return false;
44 }
45
46 auto callback = [&](const art_api::dex::DexFile::Method& method) {
47 size_t name_size, code_size;
48 const char* name = method.GetQualifiedName(/*with_params=*/false, &name_size);
49 size_t offset = method.GetCodeOffset(&code_size);
50 DexFileSymbol symbol{std::string_view(name, name_size), dex_offset + offset, code_size};
51 symbol_cb(&symbol);
52 };
53 dex_file->ForEachMethod(callback);
54 }
55
56 return true;
57 }
58
ReadSymbolsFromDexFileInMemory(void * addr,uint64_t size,const std::vector<uint64_t> & dex_file_offsets,const std::function<void (DexFileSymbol *)> & symbol_callback)59 bool ReadSymbolsFromDexFileInMemory(void* addr, uint64_t size,
60 const std::vector<uint64_t>& dex_file_offsets,
61 const std::function<void(DexFileSymbol*)>& symbol_callback) {
62 return ReadSymbols(
63 dex_file_offsets,
64 [&](uint64_t offset) -> std::unique_ptr<art_api::dex::DexFile> {
65 size_t max_file_size;
66 if (__builtin_sub_overflow(size, offset, &max_file_size)) {
67 return nullptr;
68 }
69 uint8_t* file_addr = static_cast<uint8_t*>(addr) + offset;
70 std::unique_ptr<art_api::dex::DexFile> dex_file;
71 art_api::dex::DexFile::Error error_msg =
72 art_api::dex::DexFile::Create(file_addr, max_file_size, nullptr, "", &dex_file);
73 if (dex_file == nullptr) {
74 LOG(WARNING) << "Failed to read dex file symbols: " << error_msg.ToString();
75 return nullptr;
76 }
77 return dex_file;
78 },
79 symbol_callback);
80 }
81
ReadSymbolsFromDexFile(const std::string & file_path,const std::vector<uint64_t> & dex_file_offsets,const std::function<void (DexFileSymbol *)> & symbol_callback)82 bool ReadSymbolsFromDexFile(const std::string& file_path,
83 const std::vector<uint64_t>& dex_file_offsets,
84 const std::function<void(DexFileSymbol*)>& symbol_callback) {
85 android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(file_path.c_str(), O_RDONLY | O_CLOEXEC)));
86 if (fd == -1) {
87 return false;
88 }
89 size_t file_size = GetFileSize(file_path);
90 if (file_size == 0) {
91 return false;
92 }
93 std::unique_ptr<android::base::MappedFile> map;
94 map = android::base::MappedFile::FromFd(fd, 0, file_size, PROT_READ);
95 if (map == nullptr) {
96 return false;
97 }
98 return ReadSymbolsFromDexFileInMemory(map->data(), file_size, dex_file_offsets, symbol_callback);
99 }
100
101 } // namespace simpleperf
102