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 #include <zlib.h> 25 26 #include "base/bit_utils.h" 27 #include "base/logging.h" 28 #include "dex_file.h" 29 30 namespace art { 31 32 class TestDexFileBuilder { 33 public: 34 TestDexFileBuilder() 35 : strings_(), types_(), fields_(), protos_(), dex_file_data_() { 36 } 37 38 void AddString(const std::string& str) { 39 CHECK(dex_file_data_.empty()); 40 auto it = strings_.emplace(str, IdxAndDataOffset()).first; 41 CHECK_LT(it->first.length(), 128u); // Don't allow multi-byte length in uleb128. 42 } 43 44 void AddType(const std::string& descriptor) { 45 CHECK(dex_file_data_.empty()); 46 AddString(descriptor); 47 types_.emplace(descriptor, 0u); 48 } 49 50 void AddField(const std::string& class_descriptor, const std::string& type, 51 const std::string& name) { 52 CHECK(dex_file_data_.empty()); 53 AddType(class_descriptor); 54 AddType(type); 55 AddString(name); 56 FieldKey key = { class_descriptor, type, name }; 57 fields_.emplace(key, 0u); 58 } 59 60 void AddMethod(const std::string& class_descriptor, const std::string& signature, 61 const std::string& name) { 62 CHECK(dex_file_data_.empty()); 63 AddType(class_descriptor); 64 AddString(name); 65 66 ProtoKey proto_key = CreateProtoKey(signature); 67 AddString(proto_key.shorty); 68 AddType(proto_key.return_type); 69 for (const auto& arg_type : proto_key.args) { 70 AddType(arg_type); 71 } 72 auto it = protos_.emplace(proto_key, IdxAndDataOffset()).first; 73 const ProtoKey* proto = &it->first; // Valid as long as the element remains in protos_. 74 75 MethodKey method_key = { 76 class_descriptor, name, proto 77 }; 78 methods_.emplace(method_key, 0u); 79 } 80 81 // NOTE: The builder holds the actual data, so it must live as long as the dex file. 82 std::unique_ptr<const DexFile> Build(const std::string& dex_location) { 83 CHECK(dex_file_data_.empty()); 84 union { 85 uint8_t data[sizeof(DexFile::Header)]; 86 uint64_t force_alignment; 87 } header_data; 88 std::memset(header_data.data, 0, sizeof(header_data.data)); 89 DexFile::Header* header = reinterpret_cast<DexFile::Header*>(&header_data.data); 90 std::copy_n(DexFile::kDexMagic, 4u, header->magic_); 91 std::copy_n(DexFile::kDexMagicVersions[0], 4u, header->magic_ + 4u); 92 header->header_size_ = sizeof(DexFile::Header); 93 header->endian_tag_ = DexFile::kDexEndianConstant; 94 header->link_size_ = 0u; // Unused. 95 header->link_off_ = 0u; // Unused. 96 header->map_off_ = 0u; // Unused. TODO: This is wrong. Dex files created by this builder 97 // cannot be verified. b/26808512 98 99 uint32_t data_section_size = 0u; 100 101 uint32_t string_ids_offset = sizeof(DexFile::Header); 102 uint32_t string_idx = 0u; 103 for (auto& entry : strings_) { 104 entry.second.idx = string_idx; 105 string_idx += 1u; 106 entry.second.data_offset = data_section_size; 107 data_section_size += entry.first.length() + 1u /* length */ + 1u /* null-terminator */; 108 } 109 header->string_ids_size_ = strings_.size(); 110 header->string_ids_off_ = strings_.empty() ? 0u : string_ids_offset; 111 112 uint32_t type_ids_offset = string_ids_offset + strings_.size() * sizeof(DexFile::StringId); 113 uint32_t type_idx = 0u; 114 for (auto& entry : types_) { 115 entry.second = type_idx; 116 type_idx += 1u; 117 } 118 header->type_ids_size_ = types_.size(); 119 header->type_ids_off_ = types_.empty() ? 0u : type_ids_offset; 120 121 uint32_t proto_ids_offset = type_ids_offset + types_.size() * sizeof(DexFile::TypeId); 122 uint32_t proto_idx = 0u; 123 for (auto& entry : protos_) { 124 entry.second.idx = proto_idx; 125 proto_idx += 1u; 126 size_t num_args = entry.first.args.size(); 127 if (num_args != 0u) { 128 entry.second.data_offset = RoundUp(data_section_size, 4u); 129 data_section_size = entry.second.data_offset + 4u + num_args * sizeof(DexFile::TypeItem); 130 } else { 131 entry.second.data_offset = 0u; 132 } 133 } 134 header->proto_ids_size_ = protos_.size(); 135 header->proto_ids_off_ = protos_.empty() ? 0u : proto_ids_offset; 136 137 uint32_t field_ids_offset = proto_ids_offset + protos_.size() * sizeof(DexFile::ProtoId); 138 uint32_t field_idx = 0u; 139 for (auto& entry : fields_) { 140 entry.second = field_idx; 141 field_idx += 1u; 142 } 143 header->field_ids_size_ = fields_.size(); 144 header->field_ids_off_ = fields_.empty() ? 0u : field_ids_offset; 145 146 uint32_t method_ids_offset = field_ids_offset + fields_.size() * sizeof(DexFile::FieldId); 147 uint32_t method_idx = 0u; 148 for (auto& entry : methods_) { 149 entry.second = method_idx; 150 method_idx += 1u; 151 } 152 header->method_ids_size_ = methods_.size(); 153 header->method_ids_off_ = methods_.empty() ? 0u : method_ids_offset; 154 155 // No class defs. 156 header->class_defs_size_ = 0u; 157 header->class_defs_off_ = 0u; 158 159 uint32_t data_section_offset = method_ids_offset + methods_.size() * sizeof(DexFile::MethodId); 160 header->data_size_ = data_section_size; 161 header->data_off_ = (data_section_size != 0u) ? data_section_offset : 0u; 162 163 uint32_t total_size = data_section_offset + data_section_size; 164 165 dex_file_data_.resize(total_size); 166 167 for (const auto& entry : strings_) { 168 CHECK_LT(entry.first.size(), 128u); 169 uint32_t raw_offset = data_section_offset + entry.second.data_offset; 170 dex_file_data_[raw_offset] = static_cast<uint8_t>(entry.first.size()); 171 std::memcpy(&dex_file_data_[raw_offset + 1], entry.first.c_str(), entry.first.size() + 1); 172 Write32(string_ids_offset + entry.second.idx * sizeof(DexFile::StringId), raw_offset); 173 } 174 175 for (const auto& entry : types_) { 176 Write32(type_ids_offset + entry.second * sizeof(DexFile::TypeId), GetStringIdx(entry.first)); 177 ++type_idx; 178 } 179 180 for (const auto& entry : protos_) { 181 size_t num_args = entry.first.args.size(); 182 uint32_t type_list_offset = 183 (num_args != 0u) ? data_section_offset + entry.second.data_offset : 0u; 184 uint32_t raw_offset = proto_ids_offset + entry.second.idx * sizeof(DexFile::ProtoId); 185 Write32(raw_offset + 0u, GetStringIdx(entry.first.shorty)); 186 Write16(raw_offset + 4u, GetTypeIdx(entry.first.return_type)); 187 Write32(raw_offset + 8u, type_list_offset); 188 if (num_args != 0u) { 189 CHECK_NE(entry.second.data_offset, 0u); 190 Write32(type_list_offset, num_args); 191 for (size_t i = 0; i != num_args; ++i) { 192 Write16(type_list_offset + 4u + i * sizeof(DexFile::TypeItem), 193 GetTypeIdx(entry.first.args[i])); 194 } 195 } 196 } 197 198 for (const auto& entry : fields_) { 199 uint32_t raw_offset = field_ids_offset + entry.second * sizeof(DexFile::FieldId); 200 Write16(raw_offset + 0u, GetTypeIdx(entry.first.class_descriptor)); 201 Write16(raw_offset + 2u, GetTypeIdx(entry.first.type)); 202 Write32(raw_offset + 4u, GetStringIdx(entry.first.name)); 203 } 204 205 for (const auto& entry : methods_) { 206 uint32_t raw_offset = method_ids_offset + entry.second * sizeof(DexFile::MethodId); 207 Write16(raw_offset + 0u, GetTypeIdx(entry.first.class_descriptor)); 208 auto it = protos_.find(*entry.first.proto); 209 CHECK(it != protos_.end()); 210 Write16(raw_offset + 2u, it->second.idx); 211 Write32(raw_offset + 4u, GetStringIdx(entry.first.name)); 212 } 213 214 // Leave signature as zeros. 215 216 header->file_size_ = dex_file_data_.size(); 217 218 // Write the complete header early, as part of it needs to be checksummed. 219 std::memcpy(&dex_file_data_[0], header_data.data, sizeof(DexFile::Header)); 220 221 // Checksum starts after the checksum field. 222 size_t skip = sizeof(header->magic_) + sizeof(header->checksum_); 223 header->checksum_ = adler32(adler32(0L, Z_NULL, 0), 224 dex_file_data_.data() + skip, 225 dex_file_data_.size() - skip); 226 227 // Write the complete header again, just simpler that way. 228 std::memcpy(&dex_file_data_[0], header_data.data, sizeof(DexFile::Header)); 229 230 std::string error_msg; 231 std::unique_ptr<const DexFile> dex_file(DexFile::Open( 232 &dex_file_data_[0], dex_file_data_.size(), dex_location, 0u, nullptr, false, &error_msg)); 233 CHECK(dex_file != nullptr) << error_msg; 234 return dex_file; 235 } 236 237 uint32_t GetStringIdx(const std::string& type) { 238 auto it = strings_.find(type); 239 CHECK(it != strings_.end()); 240 return it->second.idx; 241 } 242 243 uint32_t GetTypeIdx(const std::string& type) { 244 auto it = types_.find(type); 245 CHECK(it != types_.end()); 246 return it->second; 247 } 248 249 uint32_t GetFieldIdx(const std::string& class_descriptor, const std::string& type, 250 const std::string& name) { 251 FieldKey key = { class_descriptor, type, name }; 252 auto it = fields_.find(key); 253 CHECK(it != fields_.end()); 254 return it->second; 255 } 256 257 uint32_t GetMethodIdx(const std::string& class_descriptor, const std::string& signature, 258 const std::string& name) { 259 ProtoKey proto_key = CreateProtoKey(signature); 260 MethodKey method_key = { class_descriptor, name, &proto_key }; 261 auto it = methods_.find(method_key); 262 CHECK(it != methods_.end()); 263 return it->second; 264 } 265 266 private: 267 struct IdxAndDataOffset { 268 uint32_t idx; 269 uint32_t data_offset; 270 }; 271 272 struct FieldKey { 273 const std::string class_descriptor; 274 const std::string type; 275 const std::string name; 276 }; 277 struct FieldKeyComparator { 278 bool operator()(const FieldKey& lhs, const FieldKey& rhs) const { 279 if (lhs.class_descriptor != rhs.class_descriptor) { 280 return lhs.class_descriptor < rhs.class_descriptor; 281 } 282 if (lhs.name != rhs.name) { 283 return lhs.name < rhs.name; 284 } 285 return lhs.type < rhs.type; 286 } 287 }; 288 289 struct ProtoKey { 290 std::string shorty; 291 std::string return_type; 292 std::vector<std::string> args; 293 }; 294 struct ProtoKeyComparator { 295 bool operator()(const ProtoKey& lhs, const ProtoKey& rhs) const { 296 if (lhs.return_type != rhs.return_type) { 297 return lhs.return_type < rhs.return_type; 298 } 299 size_t min_args = std::min(lhs.args.size(), rhs.args.size()); 300 for (size_t i = 0; i != min_args; ++i) { 301 if (lhs.args[i] != rhs.args[i]) { 302 return lhs.args[i] < rhs.args[i]; 303 } 304 } 305 return lhs.args.size() < rhs.args.size(); 306 } 307 }; 308 309 struct MethodKey { 310 std::string class_descriptor; 311 std::string name; 312 const ProtoKey* proto; 313 }; 314 struct MethodKeyComparator { 315 bool operator()(const MethodKey& lhs, const MethodKey& rhs) const { 316 if (lhs.class_descriptor != rhs.class_descriptor) { 317 return lhs.class_descriptor < rhs.class_descriptor; 318 } 319 if (lhs.name != rhs.name) { 320 return lhs.name < rhs.name; 321 } 322 return ProtoKeyComparator()(*lhs.proto, *rhs.proto); 323 } 324 }; 325 326 ProtoKey CreateProtoKey(const std::string& signature) { 327 CHECK_EQ(signature[0], '('); 328 const char* args = signature.c_str() + 1; 329 const char* args_end = std::strchr(args, ')'); 330 CHECK(args_end != nullptr); 331 const char* return_type = args_end + 1; 332 333 ProtoKey key = { 334 std::string() + ((*return_type == '[') ? 'L' : *return_type), 335 return_type, 336 std::vector<std::string>() 337 }; 338 while (args != args_end) { 339 key.shorty += (*args == '[') ? 'L' : *args; 340 const char* arg_start = args; 341 while (*args == '[') { 342 ++args; 343 } 344 if (*args == 'L') { 345 do { 346 ++args; 347 CHECK_NE(args, args_end); 348 } while (*args != ';'); 349 } 350 ++args; 351 key.args.emplace_back(arg_start, args); 352 } 353 return key; 354 } 355 356 void Write32(size_t offset, uint32_t value) { 357 CHECK_LE(offset + 4u, dex_file_data_.size()); 358 CHECK_EQ(dex_file_data_[offset + 0], 0u); 359 CHECK_EQ(dex_file_data_[offset + 1], 0u); 360 CHECK_EQ(dex_file_data_[offset + 2], 0u); 361 CHECK_EQ(dex_file_data_[offset + 3], 0u); 362 dex_file_data_[offset + 0] = static_cast<uint8_t>(value >> 0); 363 dex_file_data_[offset + 1] = static_cast<uint8_t>(value >> 8); 364 dex_file_data_[offset + 2] = static_cast<uint8_t>(value >> 16); 365 dex_file_data_[offset + 3] = static_cast<uint8_t>(value >> 24); 366 } 367 368 void Write16(size_t offset, uint32_t value) { 369 CHECK_LE(value, 0xffffu); 370 CHECK_LE(offset + 2u, dex_file_data_.size()); 371 CHECK_EQ(dex_file_data_[offset + 0], 0u); 372 CHECK_EQ(dex_file_data_[offset + 1], 0u); 373 dex_file_data_[offset + 0] = static_cast<uint8_t>(value >> 0); 374 dex_file_data_[offset + 1] = static_cast<uint8_t>(value >> 8); 375 } 376 377 std::map<std::string, IdxAndDataOffset> strings_; 378 std::map<std::string, uint32_t> types_; 379 std::map<FieldKey, uint32_t, FieldKeyComparator> fields_; 380 std::map<ProtoKey, IdxAndDataOffset, ProtoKeyComparator> protos_; 381 std::map<MethodKey, uint32_t, MethodKeyComparator> methods_; 382 383 std::vector<uint8_t> dex_file_data_; 384 }; 385 386 } // namespace art 387 388 #endif // ART_COMPILER_UTILS_TEST_DEX_FILE_BUILDER_H_ 389
