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 #ifndef ART_COMPILER_UTILS_TEST_DEX_FILE_BUILDER_H_ 18 #define ART_COMPILER_UTILS_TEST_DEX_FILE_BUILDER_H_ 19 20 #include <cstring> 21 #include <set> 22 #include <map> 23 #include <vector> 24 25 #include "base/bit_utils.h" 26 #include "base/logging.h" 27 #include "dex_file.h" 28 29 namespace art { 30 31 class TestDexFileBuilder { 32 public: 33 TestDexFileBuilder() 34 : strings_(), types_(), fields_(), protos_(), dex_file_data_() { 35 } 36 37 void AddString(const std::string& str) { 38 CHECK(dex_file_data_.empty()); 39 auto it = strings_.emplace(str, IdxAndDataOffset()).first; 40 CHECK_LT(it->first.length(), 128u); // Don't allow multi-byte length in uleb128. 41 } 42 43 void AddType(const std::string& descriptor) { 44 CHECK(dex_file_data_.empty()); 45 AddString(descriptor); 46 types_.emplace(descriptor, 0u); 47 } 48 49 void AddField(const std::string& class_descriptor, const std::string& type, 50 const std::string& name) { 51 CHECK(dex_file_data_.empty()); 52 AddType(class_descriptor); 53 AddType(type); 54 AddString(name); 55 FieldKey key = { class_descriptor, type, name }; 56 fields_.emplace(key, 0u); 57 } 58 59 void AddMethod(const std::string& class_descriptor, const std::string& signature, 60 const std::string& name) { 61 CHECK(dex_file_data_.empty()); 62 AddType(class_descriptor); 63 AddString(name); 64 65 ProtoKey proto_key = CreateProtoKey(signature); 66 AddString(proto_key.shorty); 67 AddType(proto_key.return_type); 68 for (const auto& arg_type : proto_key.args) { 69 AddType(arg_type); 70 } 71 auto it = protos_.emplace(proto_key, IdxAndDataOffset()).first; 72 const ProtoKey* proto = &it->first; // Valid as long as the element remains in protos_. 73 74 MethodKey method_key = { 75 class_descriptor, name, proto 76 }; 77 methods_.emplace(method_key, 0u); 78 } 79 80 // NOTE: The builder holds the actual data, so it must live as long as the dex file. 81 std::unique_ptr<const DexFile> Build(const std::string& dex_location) { 82 CHECK(dex_file_data_.empty()); 83 union { 84 uint8_t data[sizeof(DexFile::Header)]; 85 uint64_t force_alignment; 86 } header_data; 87 std::memset(header_data.data, 0, sizeof(header_data.data)); 88 DexFile::Header* header = reinterpret_cast<DexFile::Header*>(&header_data.data); 89 std::copy_n(DexFile::kDexMagic, 4u, header->magic_); 90 std::copy_n(DexFile::kDexMagicVersion, 4u, header->magic_ + 4u); 91 header->header_size_ = sizeof(header); 92 header->endian_tag_ = DexFile::kDexEndianConstant; 93 header->link_size_ = 0u; // Unused. 94 header->link_off_ = 0u; // Unused. 95 header->map_off_ = 0u; // Unused. 96 97 uint32_t data_section_size = 0u; 98 99 uint32_t string_ids_offset = sizeof(DexFile::Header); 100 uint32_t string_idx = 0u; 101 for (auto& entry : strings_) { 102 entry.second.idx = string_idx; 103 string_idx += 1u; 104 entry.second.data_offset = data_section_size; 105 data_section_size += entry.first.length() + 1u /* length */ + 1u /* null-terminator */; 106 } 107 header->string_ids_size_ = strings_.size(); 108 header->string_ids_off_ = strings_.empty() ? 0u : string_ids_offset; 109 110 uint32_t type_ids_offset = string_ids_offset + strings_.size() * sizeof(DexFile::StringId); 111 uint32_t type_idx = 0u; 112 for (auto& entry : types_) { 113 entry.second = type_idx; 114 type_idx += 1u; 115 } 116 header->type_ids_size_ = types_.size(); 117 header->type_ids_off_ = types_.empty() ? 0u : type_ids_offset; 118 119 uint32_t proto_ids_offset = type_ids_offset + types_.size() * sizeof(DexFile::TypeId); 120 uint32_t proto_idx = 0u; 121 for (auto& entry : protos_) { 122 entry.second.idx = proto_idx; 123 proto_idx += 1u; 124 size_t num_args = entry.first.args.size(); 125 if (num_args != 0u) { 126 entry.second.data_offset = RoundUp(data_section_size, 4u); 127 data_section_size = entry.second.data_offset + 4u + num_args * sizeof(DexFile::TypeItem); 128 } else { 129 entry.second.data_offset = 0u; 130 } 131 } 132 header->proto_ids_size_ = protos_.size(); 133 header->proto_ids_off_ = protos_.empty() ? 0u : proto_ids_offset; 134 135 uint32_t field_ids_offset = proto_ids_offset + protos_.size() * sizeof(DexFile::ProtoId); 136 uint32_t field_idx = 0u; 137 for (auto& entry : fields_) { 138 entry.second = field_idx; 139 field_idx += 1u; 140 } 141 header->field_ids_size_ = fields_.size(); 142 header->field_ids_off_ = fields_.empty() ? 0u : field_ids_offset; 143 144 uint32_t method_ids_offset = field_ids_offset + fields_.size() * sizeof(DexFile::FieldId); 145 uint32_t method_idx = 0u; 146 for (auto& entry : methods_) { 147 entry.second = method_idx; 148 method_idx += 1u; 149 } 150 header->method_ids_size_ = methods_.size(); 151 header->method_ids_off_ = methods_.empty() ? 0u : method_ids_offset; 152 153 // No class defs. 154 header->class_defs_size_ = 0u; 155 header->class_defs_off_ = 0u; 156 157 uint32_t data_section_offset = method_ids_offset + methods_.size() * sizeof(DexFile::MethodId); 158 header->data_size_ = data_section_size; 159 header->data_off_ = (data_section_size != 0u) ? data_section_offset : 0u; 160 161 uint32_t total_size = data_section_offset + data_section_size; 162 163 dex_file_data_.resize(total_size); 164 std::memcpy(&dex_file_data_[0], header_data.data, sizeof(DexFile::Header)); 165 166 for (const auto& entry : strings_) { 167 CHECK_LT(entry.first.size(), 128u); 168 uint32_t raw_offset = data_section_offset + entry.second.data_offset; 169 dex_file_data_[raw_offset] = static_cast<uint8_t>(entry.first.size()); 170 std::memcpy(&dex_file_data_[raw_offset + 1], entry.first.c_str(), entry.first.size() + 1); 171 Write32(string_ids_offset + entry.second.idx * sizeof(DexFile::StringId), raw_offset); 172 } 173 174 for (const auto& entry : types_) { 175 Write32(type_ids_offset + entry.second * sizeof(DexFile::TypeId), GetStringIdx(entry.first)); 176 ++type_idx; 177 } 178 179 for (const auto& entry : protos_) { 180 size_t num_args = entry.first.args.size(); 181 uint32_t type_list_offset = 182 (num_args != 0u) ? data_section_offset + entry.second.data_offset : 0u; 183 uint32_t raw_offset = proto_ids_offset + entry.second.idx * sizeof(DexFile::ProtoId); 184 Write32(raw_offset + 0u, GetStringIdx(entry.first.shorty)); 185 Write16(raw_offset + 4u, GetTypeIdx(entry.first.return_type)); 186 Write32(raw_offset + 8u, type_list_offset); 187 if (num_args != 0u) { 188 CHECK_NE(entry.second.data_offset, 0u); 189 Write32(type_list_offset, num_args); 190 for (size_t i = 0; i != num_args; ++i) { 191 Write16(type_list_offset + 4u + i * sizeof(DexFile::TypeItem), 192 GetTypeIdx(entry.first.args[i])); 193 } 194 } 195 } 196 197 for (const auto& entry : fields_) { 198 uint32_t raw_offset = field_ids_offset + entry.second * sizeof(DexFile::FieldId); 199 Write16(raw_offset + 0u, GetTypeIdx(entry.first.class_descriptor)); 200 Write16(raw_offset + 2u, GetTypeIdx(entry.first.type)); 201 Write32(raw_offset + 4u, GetStringIdx(entry.first.name)); 202 } 203 204 for (const auto& entry : methods_) { 205 uint32_t raw_offset = method_ids_offset + entry.second * sizeof(DexFile::MethodId); 206 Write16(raw_offset + 0u, GetTypeIdx(entry.first.class_descriptor)); 207 auto it = protos_.find(*entry.first.proto); 208 CHECK(it != protos_.end()); 209 Write16(raw_offset + 2u, it->second.idx); 210 Write32(raw_offset + 4u, GetStringIdx(entry.first.name)); 211 } 212 213 // Leave checksum and signature as zeros. 214 215 std::string error_msg; 216 std::unique_ptr<const DexFile> dex_file(DexFile::Open( 217 &dex_file_data_[0], dex_file_data_.size(), dex_location, 0u, nullptr, &error_msg)); 218 CHECK(dex_file != nullptr) << error_msg; 219 return std::move(dex_file); 220 } 221 222 uint32_t GetStringIdx(const std::string& type) { 223 auto it = strings_.find(type); 224 CHECK(it != strings_.end()); 225 return it->second.idx; 226 } 227 228 uint32_t GetTypeIdx(const std::string& type) { 229 auto it = types_.find(type); 230 CHECK(it != types_.end()); 231 return it->second; 232 } 233 234 uint32_t GetFieldIdx(const std::string& class_descriptor, const std::string& type, 235 const std::string& name) { 236 FieldKey key = { class_descriptor, type, name }; 237 auto it = fields_.find(key); 238 CHECK(it != fields_.end()); 239 return it->second; 240 } 241 242 uint32_t GetMethodIdx(const std::string& class_descriptor, const std::string& signature, 243 const std::string& name) { 244 ProtoKey proto_key = CreateProtoKey(signature); 245 MethodKey method_key = { class_descriptor, name, &proto_key }; 246 auto it = methods_.find(method_key); 247 CHECK(it != methods_.end()); 248 return it->second; 249 } 250 251 private: 252 struct IdxAndDataOffset { 253 uint32_t idx; 254 uint32_t data_offset; 255 }; 256 257 struct FieldKey { 258 const std::string class_descriptor; 259 const std::string type; 260 const std::string name; 261 }; 262 struct FieldKeyComparator { 263 bool operator()(const FieldKey& lhs, const FieldKey& rhs) const { 264 if (lhs.class_descriptor != rhs.class_descriptor) { 265 return lhs.class_descriptor < rhs.class_descriptor; 266 } 267 if (lhs.name != rhs.name) { 268 return lhs.name < rhs.name; 269 } 270 return lhs.type < rhs.type; 271 } 272 }; 273 274 struct ProtoKey { 275 std::string shorty; 276 std::string return_type; 277 std::vector<std::string> args; 278 }; 279 struct ProtoKeyComparator { 280 bool operator()(const ProtoKey& lhs, const ProtoKey& rhs) const { 281 if (lhs.return_type != rhs.return_type) { 282 return lhs.return_type < rhs.return_type; 283 } 284 size_t min_args = std::min(lhs.args.size(), rhs.args.size()); 285 for (size_t i = 0; i != min_args; ++i) { 286 if (lhs.args[i] != rhs.args[i]) { 287 return lhs.args[i] < rhs.args[i]; 288 } 289 } 290 return lhs.args.size() < rhs.args.size(); 291 } 292 }; 293 294 struct MethodKey { 295 std::string class_descriptor; 296 std::string name; 297 const ProtoKey* proto; 298 }; 299 struct MethodKeyComparator { 300 bool operator()(const MethodKey& lhs, const MethodKey& rhs) const { 301 if (lhs.class_descriptor != rhs.class_descriptor) { 302 return lhs.class_descriptor < rhs.class_descriptor; 303 } 304 if (lhs.name != rhs.name) { 305 return lhs.name < rhs.name; 306 } 307 return ProtoKeyComparator()(*lhs.proto, *rhs.proto); 308 } 309 }; 310 311 ProtoKey CreateProtoKey(const std::string& signature) { 312 CHECK_EQ(signature[0], '('); 313 const char* args = signature.c_str() + 1; 314 const char* args_end = std::strchr(args, ')'); 315 CHECK(args_end != nullptr); 316 const char* return_type = args_end + 1; 317 318 ProtoKey key = { 319 std::string() + ((*return_type == '[') ? 'L' : *return_type), 320 return_type, 321 std::vector<std::string>() 322 }; 323 while (args != args_end) { 324 key.shorty += (*args == '[') ? 'L' : *args; 325 const char* arg_start = args; 326 while (*args == '[') { 327 ++args; 328 } 329 if (*args == 'L') { 330 do { 331 ++args; 332 CHECK_NE(args, args_end); 333 } while (*args != ';'); 334 } 335 ++args; 336 key.args.emplace_back(arg_start, args); 337 } 338 return key; 339 } 340 341 void Write32(size_t offset, uint32_t value) { 342 CHECK_LE(offset + 4u, dex_file_data_.size()); 343 CHECK_EQ(dex_file_data_[offset + 0], 0u); 344 CHECK_EQ(dex_file_data_[offset + 1], 0u); 345 CHECK_EQ(dex_file_data_[offset + 2], 0u); 346 CHECK_EQ(dex_file_data_[offset + 3], 0u); 347 dex_file_data_[offset + 0] = static_cast<uint8_t>(value >> 0); 348 dex_file_data_[offset + 1] = static_cast<uint8_t>(value >> 8); 349 dex_file_data_[offset + 2] = static_cast<uint8_t>(value >> 16); 350 dex_file_data_[offset + 3] = static_cast<uint8_t>(value >> 24); 351 } 352 353 void Write16(size_t offset, uint32_t value) { 354 CHECK_LE(value, 0xffffu); 355 CHECK_LE(offset + 2u, dex_file_data_.size()); 356 CHECK_EQ(dex_file_data_[offset + 0], 0u); 357 CHECK_EQ(dex_file_data_[offset + 1], 0u); 358 dex_file_data_[offset + 0] = static_cast<uint8_t>(value >> 0); 359 dex_file_data_[offset + 1] = static_cast<uint8_t>(value >> 8); 360 } 361 362 std::map<std::string, IdxAndDataOffset> strings_; 363 std::map<std::string, uint32_t> types_; 364 std::map<FieldKey, uint32_t, FieldKeyComparator> fields_; 365 std::map<ProtoKey, IdxAndDataOffset, ProtoKeyComparator> protos_; 366 std::map<MethodKey, uint32_t, MethodKeyComparator> methods_; 367 368 std::vector<uint8_t> dex_file_data_; 369 }; 370 371 } // namespace art 372 373 #endif // ART_COMPILER_UTILS_TEST_DEX_FILE_BUILDER_H_ 374
