dex_file.h revision 68b56858367e29461ae290fd797443a1ef6d8005
1/* 2 * Copyright (C) 2011 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_RUNTIME_DEX_FILE_H_ 18#define ART_RUNTIME_DEX_FILE_H_ 19 20#include <memory> 21#include <string> 22#include <unordered_map> 23#include <vector> 24 25#include "base/logging.h" 26#include "base/mutex.h" // For Locks::mutator_lock_. 27#include "globals.h" 28#include "invoke_type.h" 29#include "jni.h" 30#include "modifiers.h" 31#include "utf.h" 32 33namespace art { 34 35// TODO: remove dependencies on mirror classes, primarily by moving 36// EncodedStaticFieldValueIterator to its own file. 37namespace mirror { 38 class ArtField; 39 class ArtMethod; 40 class ClassLoader; 41 class DexCache; 42} // namespace mirror 43class ClassLinker; 44class MemMap; 45class Signature; 46template<class T> class Handle; 47class StringPiece; 48class ZipArchive; 49 50// TODO: move all of the macro functionality into the DexCache class. 51class DexFile { 52 public: 53 static const byte kDexMagic[]; 54 static const byte kDexMagicVersion[]; 55 static const size_t kSha1DigestSize = 20; 56 static const uint32_t kDexEndianConstant = 0x12345678; 57 58 // name of the DexFile entry within a zip archive 59 static const char* kClassesDex; 60 61 // The value of an invalid index. 62 static const uint32_t kDexNoIndex = 0xFFFFFFFF; 63 64 // The value of an invalid index. 65 static const uint16_t kDexNoIndex16 = 0xFFFF; 66 67 // The separator charactor in MultiDex locations. 68 static constexpr char kMultiDexSeparator = ':'; 69 70 // A string version of the previous. This is a define so that we can merge string literals in the 71 // preprocessor. 72 #define kMultiDexSeparatorString ":" 73 74 // Raw header_item. 75 struct Header { 76 uint8_t magic_[8]; 77 uint32_t checksum_; // See also location_checksum_ 78 uint8_t signature_[kSha1DigestSize]; 79 uint32_t file_size_; // size of entire file 80 uint32_t header_size_; // offset to start of next section 81 uint32_t endian_tag_; 82 uint32_t link_size_; // unused 83 uint32_t link_off_; // unused 84 uint32_t map_off_; // unused 85 uint32_t string_ids_size_; // number of StringIds 86 uint32_t string_ids_off_; // file offset of StringIds array 87 uint32_t type_ids_size_; // number of TypeIds, we don't support more than 65535 88 uint32_t type_ids_off_; // file offset of TypeIds array 89 uint32_t proto_ids_size_; // number of ProtoIds, we don't support more than 65535 90 uint32_t proto_ids_off_; // file offset of ProtoIds array 91 uint32_t field_ids_size_; // number of FieldIds 92 uint32_t field_ids_off_; // file offset of FieldIds array 93 uint32_t method_ids_size_; // number of MethodIds 94 uint32_t method_ids_off_; // file offset of MethodIds array 95 uint32_t class_defs_size_; // number of ClassDefs 96 uint32_t class_defs_off_; // file offset of ClassDef array 97 uint32_t data_size_; // unused 98 uint32_t data_off_; // unused 99 100 private: 101 DISALLOW_COPY_AND_ASSIGN(Header); 102 }; 103 104 // Map item type codes. 105 enum { 106 kDexTypeHeaderItem = 0x0000, 107 kDexTypeStringIdItem = 0x0001, 108 kDexTypeTypeIdItem = 0x0002, 109 kDexTypeProtoIdItem = 0x0003, 110 kDexTypeFieldIdItem = 0x0004, 111 kDexTypeMethodIdItem = 0x0005, 112 kDexTypeClassDefItem = 0x0006, 113 kDexTypeMapList = 0x1000, 114 kDexTypeTypeList = 0x1001, 115 kDexTypeAnnotationSetRefList = 0x1002, 116 kDexTypeAnnotationSetItem = 0x1003, 117 kDexTypeClassDataItem = 0x2000, 118 kDexTypeCodeItem = 0x2001, 119 kDexTypeStringDataItem = 0x2002, 120 kDexTypeDebugInfoItem = 0x2003, 121 kDexTypeAnnotationItem = 0x2004, 122 kDexTypeEncodedArrayItem = 0x2005, 123 kDexTypeAnnotationsDirectoryItem = 0x2006, 124 }; 125 126 struct MapItem { 127 uint16_t type_; 128 uint16_t unused_; 129 uint32_t size_; 130 uint32_t offset_; 131 132 private: 133 DISALLOW_COPY_AND_ASSIGN(MapItem); 134 }; 135 136 struct MapList { 137 uint32_t size_; 138 MapItem list_[1]; 139 140 private: 141 DISALLOW_COPY_AND_ASSIGN(MapList); 142 }; 143 144 // Raw string_id_item. 145 struct StringId { 146 uint32_t string_data_off_; // offset in bytes from the base address 147 148 private: 149 DISALLOW_COPY_AND_ASSIGN(StringId); 150 }; 151 152 // Raw type_id_item. 153 struct TypeId { 154 uint32_t descriptor_idx_; // index into string_ids 155 156 private: 157 DISALLOW_COPY_AND_ASSIGN(TypeId); 158 }; 159 160 // Raw field_id_item. 161 struct FieldId { 162 uint16_t class_idx_; // index into type_ids_ array for defining class 163 uint16_t type_idx_; // index into type_ids_ array for field type 164 uint32_t name_idx_; // index into string_ids_ array for field name 165 166 private: 167 DISALLOW_COPY_AND_ASSIGN(FieldId); 168 }; 169 170 // Raw method_id_item. 171 struct MethodId { 172 uint16_t class_idx_; // index into type_ids_ array for defining class 173 uint16_t proto_idx_; // index into proto_ids_ array for method prototype 174 uint32_t name_idx_; // index into string_ids_ array for method name 175 176 private: 177 DISALLOW_COPY_AND_ASSIGN(MethodId); 178 }; 179 180 // Raw proto_id_item. 181 struct ProtoId { 182 uint32_t shorty_idx_; // index into string_ids array for shorty descriptor 183 uint16_t return_type_idx_; // index into type_ids array for return type 184 uint16_t pad_; // padding = 0 185 uint32_t parameters_off_; // file offset to type_list for parameter types 186 187 private: 188 DISALLOW_COPY_AND_ASSIGN(ProtoId); 189 }; 190 191 // Raw class_def_item. 192 struct ClassDef { 193 uint16_t class_idx_; // index into type_ids_ array for this class 194 uint16_t pad1_; // padding = 0 195 uint32_t access_flags_; 196 uint16_t superclass_idx_; // index into type_ids_ array for superclass 197 uint16_t pad2_; // padding = 0 198 uint32_t interfaces_off_; // file offset to TypeList 199 uint32_t source_file_idx_; // index into string_ids_ for source file name 200 uint32_t annotations_off_; // file offset to annotations_directory_item 201 uint32_t class_data_off_; // file offset to class_data_item 202 uint32_t static_values_off_; // file offset to EncodedArray 203 204 private: 205 DISALLOW_COPY_AND_ASSIGN(ClassDef); 206 }; 207 208 // Raw type_item. 209 struct TypeItem { 210 uint16_t type_idx_; // index into type_ids section 211 212 private: 213 DISALLOW_COPY_AND_ASSIGN(TypeItem); 214 }; 215 216 // Raw type_list. 217 class TypeList { 218 public: 219 uint32_t Size() const { 220 return size_; 221 } 222 223 const TypeItem& GetTypeItem(uint32_t idx) const { 224 DCHECK_LT(idx, this->size_); 225 return this->list_[idx]; 226 } 227 228 private: 229 uint32_t size_; // size of the list, in entries 230 TypeItem list_[1]; // elements of the list 231 DISALLOW_COPY_AND_ASSIGN(TypeList); 232 }; 233 234 // Raw code_item. 235 struct CodeItem { 236 uint16_t registers_size_; 237 uint16_t ins_size_; 238 uint16_t outs_size_; 239 uint16_t tries_size_; 240 uint32_t debug_info_off_; // file offset to debug info stream 241 uint32_t insns_size_in_code_units_; // size of the insns array, in 2 byte code units 242 uint16_t insns_[1]; 243 244 private: 245 DISALLOW_COPY_AND_ASSIGN(CodeItem); 246 }; 247 248 // Raw try_item. 249 struct TryItem { 250 uint32_t start_addr_; 251 uint16_t insn_count_; 252 uint16_t handler_off_; 253 254 private: 255 DISALLOW_COPY_AND_ASSIGN(TryItem); 256 }; 257 258 // Annotation constants. 259 enum { 260 kDexVisibilityBuild = 0x00, /* annotation visibility */ 261 kDexVisibilityRuntime = 0x01, 262 kDexVisibilitySystem = 0x02, 263 264 kDexAnnotationByte = 0x00, 265 kDexAnnotationShort = 0x02, 266 kDexAnnotationChar = 0x03, 267 kDexAnnotationInt = 0x04, 268 kDexAnnotationLong = 0x06, 269 kDexAnnotationFloat = 0x10, 270 kDexAnnotationDouble = 0x11, 271 kDexAnnotationString = 0x17, 272 kDexAnnotationType = 0x18, 273 kDexAnnotationField = 0x19, 274 kDexAnnotationMethod = 0x1a, 275 kDexAnnotationEnum = 0x1b, 276 kDexAnnotationArray = 0x1c, 277 kDexAnnotationAnnotation = 0x1d, 278 kDexAnnotationNull = 0x1e, 279 kDexAnnotationBoolean = 0x1f, 280 281 kDexAnnotationValueTypeMask = 0x1f, /* low 5 bits */ 282 kDexAnnotationValueArgShift = 5, 283 }; 284 285 struct AnnotationsDirectoryItem { 286 uint32_t class_annotations_off_; 287 uint32_t fields_size_; 288 uint32_t methods_size_; 289 uint32_t parameters_size_; 290 291 private: 292 DISALLOW_COPY_AND_ASSIGN(AnnotationsDirectoryItem); 293 }; 294 295 struct FieldAnnotationsItem { 296 uint32_t field_idx_; 297 uint32_t annotations_off_; 298 299 private: 300 DISALLOW_COPY_AND_ASSIGN(FieldAnnotationsItem); 301 }; 302 303 struct MethodAnnotationsItem { 304 uint32_t method_idx_; 305 uint32_t annotations_off_; 306 307 private: 308 DISALLOW_COPY_AND_ASSIGN(MethodAnnotationsItem); 309 }; 310 311 struct ParameterAnnotationsItem { 312 uint32_t method_idx_; 313 uint32_t annotations_off_; 314 315 private: 316 DISALLOW_COPY_AND_ASSIGN(ParameterAnnotationsItem); 317 }; 318 319 struct AnnotationSetRefItem { 320 uint32_t annotations_off_; 321 322 private: 323 DISALLOW_COPY_AND_ASSIGN(AnnotationSetRefItem); 324 }; 325 326 struct AnnotationSetRefList { 327 uint32_t size_; 328 AnnotationSetRefItem list_[1]; 329 330 private: 331 DISALLOW_COPY_AND_ASSIGN(AnnotationSetRefList); 332 }; 333 334 struct AnnotationSetItem { 335 uint32_t size_; 336 uint32_t entries_[1]; 337 338 private: 339 DISALLOW_COPY_AND_ASSIGN(AnnotationSetItem); 340 }; 341 342 struct AnnotationItem { 343 uint8_t visibility_; 344 uint8_t annotation_[1]; 345 346 private: 347 DISALLOW_COPY_AND_ASSIGN(AnnotationItem); 348 }; 349 350 // Returns the checksum of a file for comparison with GetLocationChecksum(). 351 // For .dex files, this is the header checksum. 352 // For zip files, this is the classes.dex zip entry CRC32 checksum. 353 // Return true if the checksum could be found, false otherwise. 354 static bool GetChecksum(const char* filename, uint32_t* checksum, std::string* error_msg); 355 356 // Opens .dex files found in the container, guessing the container format based on file extension. 357 static bool Open(const char* filename, const char* location, std::string* error_msg, 358 std::vector<const DexFile*>* dex_files); 359 360 // Opens .dex file, backed by existing memory 361 static const DexFile* Open(const uint8_t* base, size_t size, 362 const std::string& location, 363 uint32_t location_checksum, 364 std::string* error_msg) { 365 return OpenMemory(base, size, location, location_checksum, NULL, error_msg); 366 } 367 368 // Open all classesXXX.dex files from a zip archive. 369 static bool OpenFromZip(const ZipArchive& zip_archive, const std::string& location, 370 std::string* error_msg, std::vector<const DexFile*>* dex_files); 371 372 // Closes a .dex file. 373 virtual ~DexFile(); 374 375 const std::string& GetLocation() const { 376 return location_; 377 } 378 379 // For normal dex files, location and base location coincide. If a dex file is part of a multidex 380 // archive, the base location is the name of the originating jar/apk, stripped of any internal 381 // classes*.dex path. 382 const std::string GetBaseLocation() const { 383 if (IsMultiDexLocation(location_.c_str())) { 384 std::pair<const char*, const char*> pair = SplitMultiDexLocation(location_.c_str()); 385 std::string res(pair.first); 386 delete[] pair.first; 387 return res; 388 } else { 389 return location_; 390 } 391 } 392 393 // For DexFiles directly from .dex files, this is the checksum from the DexFile::Header. 394 // For DexFiles opened from a zip files, this will be the ZipEntry CRC32 of classes.dex. 395 uint32_t GetLocationChecksum() const { 396 return location_checksum_; 397 } 398 399 const Header& GetHeader() const { 400 DCHECK(header_ != NULL) << GetLocation(); 401 return *header_; 402 } 403 404 // Decode the dex magic version 405 uint32_t GetVersion() const; 406 407 // Returns true if the byte string points to the magic value. 408 static bool IsMagicValid(const byte* magic); 409 410 // Returns true if the byte string after the magic is the correct value. 411 static bool IsVersionValid(const byte* magic); 412 413 // Returns the number of string identifiers in the .dex file. 414 size_t NumStringIds() const { 415 DCHECK(header_ != NULL) << GetLocation(); 416 return header_->string_ids_size_; 417 } 418 419 // Returns the StringId at the specified index. 420 const StringId& GetStringId(uint32_t idx) const { 421 DCHECK_LT(idx, NumStringIds()) << GetLocation(); 422 return string_ids_[idx]; 423 } 424 425 uint32_t GetIndexForStringId(const StringId& string_id) const { 426 CHECK_GE(&string_id, string_ids_) << GetLocation(); 427 CHECK_LT(&string_id, string_ids_ + header_->string_ids_size_) << GetLocation(); 428 return &string_id - string_ids_; 429 } 430 431 int32_t GetStringLength(const StringId& string_id) const; 432 433 // Returns a pointer to the UTF-8 string data referred to by the given string_id as well as the 434 // length of the string when decoded as a UTF-16 string. Note the UTF-16 length is not the same 435 // as the string length of the string data. 436 const char* GetStringDataAndUtf16Length(const StringId& string_id, uint32_t* utf16_length) const; 437 438 const char* GetStringData(const StringId& string_id) const { 439 uint32_t ignored; 440 return GetStringDataAndUtf16Length(string_id, &ignored); 441 } 442 443 // Index version of GetStringDataAndUtf16Length. 444 const char* StringDataAndUtf16LengthByIdx(uint32_t idx, uint32_t* utf16_length) const { 445 if (idx == kDexNoIndex) { 446 *utf16_length = 0; 447 return NULL; 448 } 449 const StringId& string_id = GetStringId(idx); 450 return GetStringDataAndUtf16Length(string_id, utf16_length); 451 } 452 453 const char* StringDataByIdx(uint32_t idx) const { 454 uint32_t unicode_length; 455 return StringDataAndUtf16LengthByIdx(idx, &unicode_length); 456 } 457 458 // Looks up a string id for a given modified utf8 string. 459 const StringId* FindStringId(const char* string) const; 460 461 // Looks up a string id for a given utf16 string. 462 const StringId* FindStringId(const uint16_t* string) const; 463 464 // Returns the number of type identifiers in the .dex file. 465 uint32_t NumTypeIds() const { 466 DCHECK(header_ != NULL) << GetLocation(); 467 return header_->type_ids_size_; 468 } 469 470 // Returns the TypeId at the specified index. 471 const TypeId& GetTypeId(uint32_t idx) const { 472 DCHECK_LT(idx, NumTypeIds()) << GetLocation(); 473 return type_ids_[idx]; 474 } 475 476 uint16_t GetIndexForTypeId(const TypeId& type_id) const { 477 CHECK_GE(&type_id, type_ids_) << GetLocation(); 478 CHECK_LT(&type_id, type_ids_ + header_->type_ids_size_) << GetLocation(); 479 size_t result = &type_id - type_ids_; 480 DCHECK_LT(result, 65536U) << GetLocation(); 481 return static_cast<uint16_t>(result); 482 } 483 484 // Get the descriptor string associated with a given type index. 485 const char* StringByTypeIdx(uint32_t idx, uint32_t* unicode_length) const { 486 const TypeId& type_id = GetTypeId(idx); 487 return StringDataAndUtf16LengthByIdx(type_id.descriptor_idx_, unicode_length); 488 } 489 490 const char* StringByTypeIdx(uint32_t idx) const { 491 const TypeId& type_id = GetTypeId(idx); 492 return StringDataByIdx(type_id.descriptor_idx_); 493 } 494 495 // Returns the type descriptor string of a type id. 496 const char* GetTypeDescriptor(const TypeId& type_id) const { 497 return StringDataByIdx(type_id.descriptor_idx_); 498 } 499 500 // Looks up a type for the given string index 501 const TypeId* FindTypeId(uint32_t string_idx) const; 502 503 // Returns the number of field identifiers in the .dex file. 504 size_t NumFieldIds() const { 505 DCHECK(header_ != NULL) << GetLocation(); 506 return header_->field_ids_size_; 507 } 508 509 // Returns the FieldId at the specified index. 510 const FieldId& GetFieldId(uint32_t idx) const { 511 DCHECK_LT(idx, NumFieldIds()) << GetLocation(); 512 return field_ids_[idx]; 513 } 514 515 uint32_t GetIndexForFieldId(const FieldId& field_id) const { 516 CHECK_GE(&field_id, field_ids_) << GetLocation(); 517 CHECK_LT(&field_id, field_ids_ + header_->field_ids_size_) << GetLocation(); 518 return &field_id - field_ids_; 519 } 520 521 // Looks up a field by its declaring class, name and type 522 const FieldId* FindFieldId(const DexFile::TypeId& declaring_klass, 523 const DexFile::StringId& name, 524 const DexFile::TypeId& type) const; 525 526 // Returns the declaring class descriptor string of a field id. 527 const char* GetFieldDeclaringClassDescriptor(const FieldId& field_id) const { 528 const DexFile::TypeId& type_id = GetTypeId(field_id.class_idx_); 529 return GetTypeDescriptor(type_id); 530 } 531 532 // Returns the class descriptor string of a field id. 533 const char* GetFieldTypeDescriptor(const FieldId& field_id) const { 534 const DexFile::TypeId& type_id = GetTypeId(field_id.type_idx_); 535 return GetTypeDescriptor(type_id); 536 } 537 538 // Returns the name of a field id. 539 const char* GetFieldName(const FieldId& field_id) const { 540 return StringDataByIdx(field_id.name_idx_); 541 } 542 543 // Returns the number of method identifiers in the .dex file. 544 size_t NumMethodIds() const { 545 DCHECK(header_ != NULL) << GetLocation(); 546 return header_->method_ids_size_; 547 } 548 549 // Returns the MethodId at the specified index. 550 const MethodId& GetMethodId(uint32_t idx) const { 551 DCHECK_LT(idx, NumMethodIds()) << GetLocation(); 552 return method_ids_[idx]; 553 } 554 555 uint32_t GetIndexForMethodId(const MethodId& method_id) const { 556 CHECK_GE(&method_id, method_ids_) << GetLocation(); 557 CHECK_LT(&method_id, method_ids_ + header_->method_ids_size_) << GetLocation(); 558 return &method_id - method_ids_; 559 } 560 561 // Looks up a method by its declaring class, name and proto_id 562 const MethodId* FindMethodId(const DexFile::TypeId& declaring_klass, 563 const DexFile::StringId& name, 564 const DexFile::ProtoId& signature) const; 565 566 // Returns the declaring class descriptor string of a method id. 567 const char* GetMethodDeclaringClassDescriptor(const MethodId& method_id) const { 568 const DexFile::TypeId& type_id = GetTypeId(method_id.class_idx_); 569 return GetTypeDescriptor(type_id); 570 } 571 572 // Returns the prototype of a method id. 573 const ProtoId& GetMethodPrototype(const MethodId& method_id) const { 574 return GetProtoId(method_id.proto_idx_); 575 } 576 577 // Returns a representation of the signature of a method id. 578 const Signature GetMethodSignature(const MethodId& method_id) const; 579 580 // Returns the name of a method id. 581 const char* GetMethodName(const MethodId& method_id) const { 582 return StringDataByIdx(method_id.name_idx_); 583 } 584 585 // Returns the shorty of a method id. 586 const char* GetMethodShorty(const MethodId& method_id) const { 587 return StringDataByIdx(GetProtoId(method_id.proto_idx_).shorty_idx_); 588 } 589 const char* GetMethodShorty(const MethodId& method_id, uint32_t* length) const { 590 // Using the UTF16 length is safe here as shorties are guaranteed to be ASCII characters. 591 return StringDataAndUtf16LengthByIdx(GetProtoId(method_id.proto_idx_).shorty_idx_, length); 592 } 593 // Returns the number of class definitions in the .dex file. 594 uint32_t NumClassDefs() const { 595 DCHECK(header_ != NULL) << GetLocation(); 596 return header_->class_defs_size_; 597 } 598 599 // Returns the ClassDef at the specified index. 600 const ClassDef& GetClassDef(uint16_t idx) const { 601 DCHECK_LT(idx, NumClassDefs()) << GetLocation(); 602 return class_defs_[idx]; 603 } 604 605 uint16_t GetIndexForClassDef(const ClassDef& class_def) const { 606 CHECK_GE(&class_def, class_defs_) << GetLocation(); 607 CHECK_LT(&class_def, class_defs_ + header_->class_defs_size_) << GetLocation(); 608 return &class_def - class_defs_; 609 } 610 611 // Returns the class descriptor string of a class definition. 612 const char* GetClassDescriptor(const ClassDef& class_def) const { 613 return StringByTypeIdx(class_def.class_idx_); 614 } 615 616 // Looks up a class definition by its class descriptor. 617 const ClassDef* FindClassDef(const char* descriptor) const; 618 619 // Looks up a class definition by its type index. 620 const ClassDef* FindClassDef(uint16_t type_idx) const; 621 622 const TypeList* GetInterfacesList(const ClassDef& class_def) const { 623 if (class_def.interfaces_off_ == 0) { 624 return NULL; 625 } else { 626 const byte* addr = begin_ + class_def.interfaces_off_; 627 return reinterpret_cast<const TypeList*>(addr); 628 } 629 } 630 631 // Returns a pointer to the raw memory mapped class_data_item 632 const byte* GetClassData(const ClassDef& class_def) const { 633 if (class_def.class_data_off_ == 0) { 634 return NULL; 635 } else { 636 return begin_ + class_def.class_data_off_; 637 } 638 } 639 640 // 641 const CodeItem* GetCodeItem(const uint32_t code_off) const { 642 if (code_off == 0) { 643 return NULL; // native or abstract method 644 } else { 645 const byte* addr = begin_ + code_off; 646 return reinterpret_cast<const CodeItem*>(addr); 647 } 648 } 649 650 const char* GetReturnTypeDescriptor(const ProtoId& proto_id) const { 651 return StringByTypeIdx(proto_id.return_type_idx_); 652 } 653 654 // Returns the number of prototype identifiers in the .dex file. 655 size_t NumProtoIds() const { 656 DCHECK(header_ != NULL) << GetLocation(); 657 return header_->proto_ids_size_; 658 } 659 660 // Returns the ProtoId at the specified index. 661 const ProtoId& GetProtoId(uint32_t idx) const { 662 DCHECK_LT(idx, NumProtoIds()) << GetLocation(); 663 return proto_ids_[idx]; 664 } 665 666 uint16_t GetIndexForProtoId(const ProtoId& proto_id) const { 667 CHECK_GE(&proto_id, proto_ids_) << GetLocation(); 668 CHECK_LT(&proto_id, proto_ids_ + header_->proto_ids_size_) << GetLocation(); 669 return &proto_id - proto_ids_; 670 } 671 672 // Looks up a proto id for a given return type and signature type list 673 const ProtoId* FindProtoId(uint16_t return_type_idx, 674 const uint16_t* signature_type_idxs, uint32_t signature_length) const; 675 const ProtoId* FindProtoId(uint16_t return_type_idx, 676 const std::vector<uint16_t>& signature_type_idxs) const { 677 return FindProtoId(return_type_idx, &signature_type_idxs[0], signature_type_idxs.size()); 678 } 679 680 // Given a signature place the type ids into the given vector, returns true on success 681 bool CreateTypeList(const StringPiece& signature, uint16_t* return_type_idx, 682 std::vector<uint16_t>* param_type_idxs) const; 683 684 // Create a Signature from the given string signature or return Signature::NoSignature if not 685 // possible. 686 const Signature CreateSignature(const StringPiece& signature) const; 687 688 // Returns the short form method descriptor for the given prototype. 689 const char* GetShorty(uint32_t proto_idx) const { 690 const ProtoId& proto_id = GetProtoId(proto_idx); 691 return StringDataByIdx(proto_id.shorty_idx_); 692 } 693 694 const TypeList* GetProtoParameters(const ProtoId& proto_id) const { 695 if (proto_id.parameters_off_ == 0) { 696 return NULL; 697 } else { 698 const byte* addr = begin_ + proto_id.parameters_off_; 699 return reinterpret_cast<const TypeList*>(addr); 700 } 701 } 702 703 const byte* GetEncodedStaticFieldValuesArray(const ClassDef& class_def) const { 704 if (class_def.static_values_off_ == 0) { 705 return 0; 706 } else { 707 return begin_ + class_def.static_values_off_; 708 } 709 } 710 711 static const TryItem* GetTryItems(const CodeItem& code_item, uint32_t offset); 712 713 // Get the base of the encoded data for the given DexCode. 714 static const byte* GetCatchHandlerData(const CodeItem& code_item, uint32_t offset) { 715 const byte* handler_data = 716 reinterpret_cast<const byte*>(GetTryItems(code_item, code_item.tries_size_)); 717 return handler_data + offset; 718 } 719 720 // Find which try region is associated with the given address (ie dex pc). Returns -1 if none. 721 static int32_t FindTryItem(const CodeItem &code_item, uint32_t address); 722 723 // Find the handler offset associated with the given address (ie dex pc). Returns -1 if none. 724 static int32_t FindCatchHandlerOffset(const CodeItem &code_item, uint32_t address); 725 726 // Get the pointer to the start of the debugging data 727 const byte* GetDebugInfoStream(const CodeItem* code_item) const { 728 if (code_item->debug_info_off_ == 0) { 729 return NULL; 730 } else { 731 return begin_ + code_item->debug_info_off_; 732 } 733 } 734 735 // Callback for "new position table entry". 736 // Returning true causes the decoder to stop early. 737 typedef bool (*DexDebugNewPositionCb)(void* context, uint32_t address, uint32_t line_num); 738 739 // Callback for "new locals table entry". "signature" is an empty string 740 // if no signature is available for an entry. 741 typedef void (*DexDebugNewLocalCb)(void* context, uint16_t reg, 742 uint32_t start_address, 743 uint32_t end_address, 744 const char* name, 745 const char* descriptor, 746 const char* signature); 747 748 static bool LineNumForPcCb(void* context, uint32_t address, uint32_t line_num); 749 750 // Debug info opcodes and constants 751 enum { 752 DBG_END_SEQUENCE = 0x00, 753 DBG_ADVANCE_PC = 0x01, 754 DBG_ADVANCE_LINE = 0x02, 755 DBG_START_LOCAL = 0x03, 756 DBG_START_LOCAL_EXTENDED = 0x04, 757 DBG_END_LOCAL = 0x05, 758 DBG_RESTART_LOCAL = 0x06, 759 DBG_SET_PROLOGUE_END = 0x07, 760 DBG_SET_EPILOGUE_BEGIN = 0x08, 761 DBG_SET_FILE = 0x09, 762 DBG_FIRST_SPECIAL = 0x0a, 763 DBG_LINE_BASE = -4, 764 DBG_LINE_RANGE = 15, 765 }; 766 767 struct LocalInfo { 768 LocalInfo() 769 : name_(NULL), descriptor_(NULL), signature_(NULL), start_address_(0), is_live_(false) {} 770 771 const char* name_; // E.g., list 772 const char* descriptor_; // E.g., Ljava/util/LinkedList; 773 const char* signature_; // E.g., java.util.LinkedList<java.lang.Integer> 774 uint16_t start_address_; // PC location where the local is first defined. 775 bool is_live_; // Is the local defined and live. 776 777 private: 778 DISALLOW_COPY_AND_ASSIGN(LocalInfo); 779 }; 780 781 struct LineNumFromPcContext { 782 LineNumFromPcContext(uint32_t address, uint32_t line_num) 783 : address_(address), line_num_(line_num) {} 784 uint32_t address_; 785 uint32_t line_num_; 786 private: 787 DISALLOW_COPY_AND_ASSIGN(LineNumFromPcContext); 788 }; 789 790 void InvokeLocalCbIfLive(void* context, int reg, uint32_t end_address, 791 LocalInfo* local_in_reg, DexDebugNewLocalCb local_cb) const { 792 if (local_cb != NULL && local_in_reg[reg].is_live_) { 793 local_cb(context, reg, local_in_reg[reg].start_address_, end_address, 794 local_in_reg[reg].name_, local_in_reg[reg].descriptor_, 795 local_in_reg[reg].signature_ != NULL ? local_in_reg[reg].signature_ : ""); 796 } 797 } 798 799 // Determine the source file line number based on the program counter. 800 // "pc" is an offset, in 16-bit units, from the start of the method's code. 801 // 802 // Returns -1 if no match was found (possibly because the source files were 803 // compiled without "-g", so no line number information is present). 804 // Returns -2 for native methods (as expected in exception traces). 805 // 806 // This is used by runtime; therefore use art::Method not art::DexFile::Method. 807 int32_t GetLineNumFromPC(mirror::ArtMethod* method, uint32_t rel_pc) const 808 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 809 810 void DecodeDebugInfo(const CodeItem* code_item, bool is_static, uint32_t method_idx, 811 DexDebugNewPositionCb position_cb, DexDebugNewLocalCb local_cb, 812 void* context) const; 813 814 const char* GetSourceFile(const ClassDef& class_def) const { 815 if (class_def.source_file_idx_ == 0xffffffff) { 816 return NULL; 817 } else { 818 return StringDataByIdx(class_def.source_file_idx_); 819 } 820 } 821 822 int GetPermissions() const; 823 824 bool IsReadOnly() const; 825 826 bool EnableWrite() const; 827 828 bool DisableWrite() const; 829 830 const byte* Begin() const { 831 return begin_; 832 } 833 834 size_t Size() const { 835 return size_; 836 } 837 838 static std::string GetMultiDexClassesDexName(size_t number, const char* dex_location); 839 840 // Returns the canonical form of the given dex location. 841 // 842 // There are different flavors of "dex locations" as follows: 843 // the file name of a dex file: 844 // The actual file path that the dex file has on disk. 845 // dex_location: 846 // This acts as a key for the class linker to know which dex file to load. 847 // It may correspond to either an old odex file or a particular dex file 848 // inside an oat file. In the first case it will also match the file name 849 // of the dex file. In the second case (oat) it will include the file name 850 // and possibly some multidex annotation to uniquely identify it. 851 // canonical_dex_location: 852 // the dex_location where it's file name part has been made canonical. 853 static std::string GetDexCanonicalLocation(const char* dex_location); 854 855 private: 856 // Opens a .dex file 857 static const DexFile* OpenFile(int fd, const char* location, bool verify, std::string* error_msg); 858 859 // Opens dex files from within a .jar, .zip, or .apk file 860 static bool OpenZip(int fd, const std::string& location, std::string* error_msg, 861 std::vector<const DexFile*>* dex_files); 862 863 enum class ZipOpenErrorCode { // private 864 kNoError, 865 kEntryNotFound, 866 kExtractToMemoryError, 867 kDexFileError, 868 kMakeReadOnlyError, 869 kVerifyError 870 }; 871 872 // Opens .dex file from the entry_name in a zip archive. error_code is undefined when non-nullptr 873 // return. 874 static const DexFile* Open(const ZipArchive& zip_archive, const char* entry_name, 875 const std::string& location, std::string* error_msg, 876 ZipOpenErrorCode* error_code); 877 878 // Opens a .dex file at the given address backed by a MemMap 879 static const DexFile* OpenMemory(const std::string& location, 880 uint32_t location_checksum, 881 MemMap* mem_map, 882 std::string* error_msg); 883 884 // Opens a .dex file at the given address, optionally backed by a MemMap 885 static const DexFile* OpenMemory(const byte* dex_file, 886 size_t size, 887 const std::string& location, 888 uint32_t location_checksum, 889 MemMap* mem_map, 890 std::string* error_msg); 891 892 DexFile(const byte* base, size_t size, 893 const std::string& location, 894 uint32_t location_checksum, 895 MemMap* mem_map); 896 897 // Top-level initializer that calls other Init methods. 898 bool Init(std::string* error_msg); 899 900 // Returns true if the header magic and version numbers are of the expected values. 901 bool CheckMagicAndVersion(std::string* error_msg) const; 902 903 void DecodeDebugInfo0(const CodeItem* code_item, bool is_static, uint32_t method_idx, 904 DexDebugNewPositionCb position_cb, DexDebugNewLocalCb local_cb, 905 void* context, const byte* stream, LocalInfo* local_in_reg) const; 906 907 // Check whether a location denotes a multidex dex file. This is a very simple check: returns 908 // whether the string contains the separator character. 909 static bool IsMultiDexLocation(const char* location); 910 911 // Splits a multidex location at the last separator character. The second component is a pointer 912 // to the character after the separator. The first is a copy of the substring up to the separator. 913 // 914 // Note: It's the caller's job to free the first component of the returned pair. 915 // Bug 15313523: gcc/libc++ don't allow a unique_ptr for the first component 916 static std::pair<const char*, const char*> SplitMultiDexLocation(const char* location); 917 918 919 // The base address of the memory mapping. 920 const byte* const begin_; 921 922 // The size of the underlying memory allocation in bytes. 923 const size_t size_; 924 925 // Typically the dex file name when available, alternatively some identifying string. 926 // 927 // The ClassLinker will use this to match DexFiles the boot class 928 // path to DexCache::GetLocation when loading from an image. 929 const std::string location_; 930 931 const uint32_t location_checksum_; 932 933 // Manages the underlying memory allocation. 934 std::unique_ptr<MemMap> mem_map_; 935 936 // Points to the header section. 937 const Header* const header_; 938 939 // Points to the base of the string identifier list. 940 const StringId* const string_ids_; 941 942 // Points to the base of the type identifier list. 943 const TypeId* const type_ids_; 944 945 // Points to the base of the field identifier list. 946 const FieldId* const field_ids_; 947 948 // Points to the base of the method identifier list. 949 const MethodId* const method_ids_; 950 951 // Points to the base of the prototype identifier list. 952 const ProtoId* const proto_ids_; 953 954 // Points to the base of the class definition list. 955 const ClassDef* const class_defs_; 956 957 // Number of misses finding a class def from a descriptor. 958 mutable Atomic<uint32_t> find_class_def_misses_; 959 960 struct UTF16HashCmp { 961 // Hash function. 962 size_t operator()(const char* key) const { 963 return ComputeUtf8Hash(key); 964 } 965 // std::equal function. 966 bool operator()(const char* a, const char* b) const { 967 return CompareModifiedUtf8ToModifiedUtf8AsUtf16CodePointValues(a, b) == 0; 968 } 969 }; 970 typedef std::unordered_map<const char*, const ClassDef*, UTF16HashCmp, UTF16HashCmp> Index; 971 mutable Atomic<Index*> class_def_index_; 972 mutable Mutex build_class_def_index_mutex_ DEFAULT_MUTEX_ACQUIRED_AFTER; 973}; 974std::ostream& operator<<(std::ostream& os, const DexFile& dex_file); 975 976// Iterate over a dex file's ProtoId's paramters 977class DexFileParameterIterator { 978 public: 979 DexFileParameterIterator(const DexFile& dex_file, const DexFile::ProtoId& proto_id) 980 : dex_file_(dex_file), size_(0), pos_(0) { 981 type_list_ = dex_file_.GetProtoParameters(proto_id); 982 if (type_list_ != NULL) { 983 size_ = type_list_->Size(); 984 } 985 } 986 bool HasNext() const { return pos_ < size_; } 987 void Next() { ++pos_; } 988 uint16_t GetTypeIdx() { 989 return type_list_->GetTypeItem(pos_).type_idx_; 990 } 991 const char* GetDescriptor() { 992 return dex_file_.StringByTypeIdx(GetTypeIdx()); 993 } 994 private: 995 const DexFile& dex_file_; 996 const DexFile::TypeList* type_list_; 997 uint32_t size_; 998 uint32_t pos_; 999 DISALLOW_IMPLICIT_CONSTRUCTORS(DexFileParameterIterator); 1000}; 1001 1002// Abstract the signature of a method. 1003class Signature { 1004 public: 1005 std::string ToString() const; 1006 1007 static Signature NoSignature() { 1008 return Signature(); 1009 } 1010 1011 bool operator==(const Signature& rhs) const; 1012 bool operator!=(const Signature& rhs) const { 1013 return !(*this == rhs); 1014 } 1015 1016 bool operator==(const StringPiece& rhs) const; 1017 1018 private: 1019 Signature(const DexFile* dex, const DexFile::ProtoId& proto) : dex_file_(dex), proto_id_(&proto) { 1020 } 1021 1022 Signature() : dex_file_(nullptr), proto_id_(nullptr) { 1023 } 1024 1025 friend class DexFile; 1026 1027 const DexFile* const dex_file_; 1028 const DexFile::ProtoId* const proto_id_; 1029}; 1030std::ostream& operator<<(std::ostream& os, const Signature& sig); 1031 1032// Iterate and decode class_data_item 1033class ClassDataItemIterator { 1034 public: 1035 ClassDataItemIterator(const DexFile& dex_file, const byte* raw_class_data_item) 1036 : dex_file_(dex_file), pos_(0), ptr_pos_(raw_class_data_item), last_idx_(0) { 1037 ReadClassDataHeader(); 1038 if (EndOfInstanceFieldsPos() > 0) { 1039 ReadClassDataField(); 1040 } else if (EndOfVirtualMethodsPos() > 0) { 1041 ReadClassDataMethod(); 1042 } 1043 } 1044 uint32_t NumStaticFields() const { 1045 return header_.static_fields_size_; 1046 } 1047 uint32_t NumInstanceFields() const { 1048 return header_.instance_fields_size_; 1049 } 1050 uint32_t NumDirectMethods() const { 1051 return header_.direct_methods_size_; 1052 } 1053 uint32_t NumVirtualMethods() const { 1054 return header_.virtual_methods_size_; 1055 } 1056 bool HasNextStaticField() const { 1057 return pos_ < EndOfStaticFieldsPos(); 1058 } 1059 bool HasNextInstanceField() const { 1060 return pos_ >= EndOfStaticFieldsPos() && pos_ < EndOfInstanceFieldsPos(); 1061 } 1062 bool HasNextDirectMethod() const { 1063 return pos_ >= EndOfInstanceFieldsPos() && pos_ < EndOfDirectMethodsPos(); 1064 } 1065 bool HasNextVirtualMethod() const { 1066 return pos_ >= EndOfDirectMethodsPos() && pos_ < EndOfVirtualMethodsPos(); 1067 } 1068 bool HasNext() const { 1069 return pos_ < EndOfVirtualMethodsPos(); 1070 } 1071 inline void Next() { 1072 pos_++; 1073 if (pos_ < EndOfStaticFieldsPos()) { 1074 last_idx_ = GetMemberIndex(); 1075 ReadClassDataField(); 1076 } else if (pos_ == EndOfStaticFieldsPos() && NumInstanceFields() > 0) { 1077 last_idx_ = 0; // transition to next array, reset last index 1078 ReadClassDataField(); 1079 } else if (pos_ < EndOfInstanceFieldsPos()) { 1080 last_idx_ = GetMemberIndex(); 1081 ReadClassDataField(); 1082 } else if (pos_ == EndOfInstanceFieldsPos() && NumDirectMethods() > 0) { 1083 last_idx_ = 0; // transition to next array, reset last index 1084 ReadClassDataMethod(); 1085 } else if (pos_ < EndOfDirectMethodsPos()) { 1086 last_idx_ = GetMemberIndex(); 1087 ReadClassDataMethod(); 1088 } else if (pos_ == EndOfDirectMethodsPos() && NumVirtualMethods() > 0) { 1089 last_idx_ = 0; // transition to next array, reset last index 1090 ReadClassDataMethod(); 1091 } else if (pos_ < EndOfVirtualMethodsPos()) { 1092 last_idx_ = GetMemberIndex(); 1093 ReadClassDataMethod(); 1094 } else { 1095 DCHECK(!HasNext()); 1096 } 1097 } 1098 uint32_t GetMemberIndex() const { 1099 if (pos_ < EndOfInstanceFieldsPos()) { 1100 return last_idx_ + field_.field_idx_delta_; 1101 } else { 1102 DCHECK_LT(pos_, EndOfVirtualMethodsPos()); 1103 return last_idx_ + method_.method_idx_delta_; 1104 } 1105 } 1106 uint32_t GetMemberAccessFlags() const { 1107 if (pos_ < EndOfInstanceFieldsPos()) { 1108 return field_.access_flags_; 1109 } else { 1110 DCHECK_LT(pos_, EndOfVirtualMethodsPos()); 1111 return method_.access_flags_; 1112 } 1113 } 1114 InvokeType GetMethodInvokeType(const DexFile::ClassDef& class_def) const { 1115 if (HasNextDirectMethod()) { 1116 if ((GetMemberAccessFlags() & kAccStatic) != 0) { 1117 return kStatic; 1118 } else { 1119 return kDirect; 1120 } 1121 } else { 1122 DCHECK_EQ(GetMemberAccessFlags() & kAccStatic, 0U); 1123 if ((class_def.access_flags_ & kAccInterface) != 0) { 1124 return kInterface; 1125 } else if ((GetMemberAccessFlags() & kAccConstructor) != 0) { 1126 return kSuper; 1127 } else { 1128 return kVirtual; 1129 } 1130 } 1131 } 1132 const DexFile::CodeItem* GetMethodCodeItem() const { 1133 return dex_file_.GetCodeItem(method_.code_off_); 1134 } 1135 uint32_t GetMethodCodeItemOffset() const { 1136 return method_.code_off_; 1137 } 1138 const byte* EndDataPointer() const { 1139 CHECK(!HasNext()); 1140 return ptr_pos_; 1141 } 1142 1143 private: 1144 // A dex file's class_data_item is leb128 encoded, this structure holds a decoded form of the 1145 // header for a class_data_item 1146 struct ClassDataHeader { 1147 uint32_t static_fields_size_; // the number of static fields 1148 uint32_t instance_fields_size_; // the number of instance fields 1149 uint32_t direct_methods_size_; // the number of direct methods 1150 uint32_t virtual_methods_size_; // the number of virtual methods 1151 } header_; 1152 1153 // Read and decode header from a class_data_item stream into header 1154 void ReadClassDataHeader(); 1155 1156 uint32_t EndOfStaticFieldsPos() const { 1157 return header_.static_fields_size_; 1158 } 1159 uint32_t EndOfInstanceFieldsPos() const { 1160 return EndOfStaticFieldsPos() + header_.instance_fields_size_; 1161 } 1162 uint32_t EndOfDirectMethodsPos() const { 1163 return EndOfInstanceFieldsPos() + header_.direct_methods_size_; 1164 } 1165 uint32_t EndOfVirtualMethodsPos() const { 1166 return EndOfDirectMethodsPos() + header_.virtual_methods_size_; 1167 } 1168 1169 // A decoded version of the field of a class_data_item 1170 struct ClassDataField { 1171 uint32_t field_idx_delta_; // delta of index into the field_ids array for FieldId 1172 uint32_t access_flags_; // access flags for the field 1173 ClassDataField() : field_idx_delta_(0), access_flags_(0) {} 1174 1175 private: 1176 DISALLOW_COPY_AND_ASSIGN(ClassDataField); 1177 }; 1178 ClassDataField field_; 1179 1180 // Read and decode a field from a class_data_item stream into field 1181 void ReadClassDataField(); 1182 1183 // A decoded version of the method of a class_data_item 1184 struct ClassDataMethod { 1185 uint32_t method_idx_delta_; // delta of index into the method_ids array for MethodId 1186 uint32_t access_flags_; 1187 uint32_t code_off_; 1188 ClassDataMethod() : method_idx_delta_(0), access_flags_(0), code_off_(0) {} 1189 1190 private: 1191 DISALLOW_COPY_AND_ASSIGN(ClassDataMethod); 1192 }; 1193 ClassDataMethod method_; 1194 1195 // Read and decode a method from a class_data_item stream into method 1196 void ReadClassDataMethod(); 1197 1198 const DexFile& dex_file_; 1199 size_t pos_; // integral number of items passed 1200 const byte* ptr_pos_; // pointer into stream of class_data_item 1201 uint32_t last_idx_; // last read field or method index to apply delta to 1202 DISALLOW_IMPLICIT_CONSTRUCTORS(ClassDataItemIterator); 1203}; 1204 1205class EncodedStaticFieldValueIterator { 1206 public: 1207 EncodedStaticFieldValueIterator(const DexFile& dex_file, Handle<mirror::DexCache>* dex_cache, 1208 Handle<mirror::ClassLoader>* class_loader, 1209 ClassLinker* linker, const DexFile::ClassDef& class_def) 1210 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 1211 1212 template<bool kTransactionActive> 1213 void ReadValueToField(Handle<mirror::ArtField> field) const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 1214 1215 bool HasNext() { return pos_ < array_size_; } 1216 1217 void Next(); 1218 1219 enum ValueType { 1220 kByte = 0x00, 1221 kShort = 0x02, 1222 kChar = 0x03, 1223 kInt = 0x04, 1224 kLong = 0x06, 1225 kFloat = 0x10, 1226 kDouble = 0x11, 1227 kString = 0x17, 1228 kType = 0x18, 1229 kField = 0x19, 1230 kMethod = 0x1a, 1231 kEnum = 0x1b, 1232 kArray = 0x1c, 1233 kAnnotation = 0x1d, 1234 kNull = 0x1e, 1235 kBoolean = 0x1f 1236 }; 1237 1238 private: 1239 static const byte kEncodedValueTypeMask = 0x1f; // 0b11111 1240 static const byte kEncodedValueArgShift = 5; 1241 1242 const DexFile& dex_file_; 1243 Handle<mirror::DexCache>* const dex_cache_; // Dex cache to resolve literal objects. 1244 Handle<mirror::ClassLoader>* const class_loader_; // ClassLoader to resolve types. 1245 ClassLinker* linker_; // Linker to resolve literal objects. 1246 size_t array_size_; // Size of array. 1247 size_t pos_; // Current position. 1248 const byte* ptr_; // Pointer into encoded data array. 1249 ValueType type_; // Type of current encoded value. 1250 jvalue jval_; // Value of current encoded value. 1251 DISALLOW_IMPLICIT_CONSTRUCTORS(EncodedStaticFieldValueIterator); 1252}; 1253std::ostream& operator<<(std::ostream& os, const EncodedStaticFieldValueIterator::ValueType& code); 1254 1255class CatchHandlerIterator { 1256 public: 1257 CatchHandlerIterator(const DexFile::CodeItem& code_item, uint32_t address); 1258 1259 CatchHandlerIterator(const DexFile::CodeItem& code_item, 1260 const DexFile::TryItem& try_item); 1261 1262 explicit CatchHandlerIterator(const byte* handler_data) { 1263 Init(handler_data); 1264 } 1265 1266 uint16_t GetHandlerTypeIndex() const { 1267 return handler_.type_idx_; 1268 } 1269 uint32_t GetHandlerAddress() const { 1270 return handler_.address_; 1271 } 1272 void Next(); 1273 bool HasNext() const { 1274 return remaining_count_ != -1 || catch_all_; 1275 } 1276 // End of this set of catch blocks, convenience method to locate next set of catch blocks 1277 const byte* EndDataPointer() const { 1278 CHECK(!HasNext()); 1279 return current_data_; 1280 } 1281 1282 private: 1283 void Init(const DexFile::CodeItem& code_item, int32_t offset); 1284 void Init(const byte* handler_data); 1285 1286 struct CatchHandlerItem { 1287 uint16_t type_idx_; // type index of the caught exception type 1288 uint32_t address_; // handler address 1289 } handler_; 1290 const byte *current_data_; // the current handler in dex file. 1291 int32_t remaining_count_; // number of handlers not read. 1292 bool catch_all_; // is there a handler that will catch all exceptions in case 1293 // that all typed handler does not match. 1294}; 1295 1296} // namespace art 1297 1298#endif // ART_RUNTIME_DEX_FILE_H_ 1299