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* Copyright (C) 2011 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <memory>
#include <string>
#include <vector>
#include "base/logging.h"
#include "base/mutex.h" // For Locks::mutator_lock_.
#include "globals.h"
#include "invoke_type.h"
#include "jni.h"
#include "mem_map.h"
#include "modifiers.h"
#include "safe_map.h"
namespace art {
// TODO: remove dependencies on mirror classes, primarily by moving
// EncodedStaticFieldValueIterator to its own file.
namespace mirror {
class ArtField;
class ArtMethod;
class ClassLoader;
class DexCache;
} // namespace mirror
class ClassLinker;
class Signature;
template<class T> class Handle;
class StringPiece;
class ZipArchive;
// TODO: move all of the macro functionality into the DexCache class.
class DexFile {
static const byte kDexMagic[];
static const byte kDexMagicVersion[];
static const size_t kSha1DigestSize = 20;
static const uint32_t kDexEndianConstant = 0x12345678;
// name of the DexFile entry within a zip archive
static const char* kClassesDex;
// The value of an invalid index.
static const uint32_t kDexNoIndex = 0xFFFFFFFF;
// The value of an invalid index.
static const uint16_t kDexNoIndex16 = 0xFFFF;
// Raw header_item.
struct Header {
uint8_t magic_[8];
uint32_t checksum_; // See also location_checksum_
uint8_t signature_[kSha1DigestSize];
uint32_t file_size_; // size of entire file
uint32_t header_size_; // offset to start of next section
uint32_t endian_tag_;
uint32_t link_size_; // unused
uint32_t link_off_; // unused
uint32_t map_off_; // unused
uint32_t string_ids_size_; // number of StringIds
uint32_t string_ids_off_; // file offset of StringIds array
uint32_t type_ids_size_; // number of TypeIds, we don't support more than 65535
uint32_t type_ids_off_; // file offset of TypeIds array
uint32_t proto_ids_size_; // number of ProtoIds, we don't support more than 65535
uint32_t proto_ids_off_; // file offset of ProtoIds array
uint32_t field_ids_size_; // number of FieldIds
uint32_t field_ids_off_; // file offset of FieldIds array
uint32_t method_ids_size_; // number of MethodIds
uint32_t method_ids_off_; // file offset of MethodIds array
uint32_t class_defs_size_; // number of ClassDefs
uint32_t class_defs_off_; // file offset of ClassDef array
uint32_t data_size_; // unused
uint32_t data_off_; // unused
// Map item type codes.
enum {
kDexTypeHeaderItem = 0x0000,
kDexTypeStringIdItem = 0x0001,
kDexTypeTypeIdItem = 0x0002,
kDexTypeProtoIdItem = 0x0003,
kDexTypeFieldIdItem = 0x0004,
kDexTypeMethodIdItem = 0x0005,
kDexTypeClassDefItem = 0x0006,
kDexTypeMapList = 0x1000,
kDexTypeTypeList = 0x1001,
kDexTypeAnnotationSetRefList = 0x1002,
kDexTypeAnnotationSetItem = 0x1003,
kDexTypeClassDataItem = 0x2000,
kDexTypeCodeItem = 0x2001,
kDexTypeStringDataItem = 0x2002,
kDexTypeDebugInfoItem = 0x2003,
kDexTypeAnnotationItem = 0x2004,
kDexTypeEncodedArrayItem = 0x2005,
kDexTypeAnnotationsDirectoryItem = 0x2006,
struct MapItem {
uint16_t type_;
uint16_t unused_;
uint32_t size_;
uint32_t offset_;
struct MapList {
uint32_t size_;
MapItem list_[1];
// Raw string_id_item.
struct StringId {
uint32_t string_data_off_; // offset in bytes from the base address
// Raw type_id_item.
struct TypeId {
uint32_t descriptor_idx_; // index into string_ids
// Raw field_id_item.
struct FieldId {
uint16_t class_idx_; // index into type_ids_ array for defining class
uint16_t type_idx_; // index into type_ids_ array for field type
uint32_t name_idx_; // index into string_ids_ array for field name
// Raw method_id_item.
struct MethodId {
uint16_t class_idx_; // index into type_ids_ array for defining class
uint16_t proto_idx_; // index into proto_ids_ array for method prototype
uint32_t name_idx_; // index into string_ids_ array for method name
// Raw proto_id_item.
struct ProtoId {
uint32_t shorty_idx_; // index into string_ids array for shorty descriptor
uint16_t return_type_idx_; // index into type_ids array for return type
uint16_t pad_; // padding = 0
uint32_t parameters_off_; // file offset to type_list for parameter types
// Raw class_def_item.
struct ClassDef {
uint16_t class_idx_; // index into type_ids_ array for this class
uint16_t pad1_; // padding = 0
uint32_t access_flags_;
uint16_t superclass_idx_; // index into type_ids_ array for superclass
uint16_t pad2_; // padding = 0
uint32_t interfaces_off_; // file offset to TypeList
uint32_t source_file_idx_; // index into string_ids_ for source file name
uint32_t annotations_off_; // file offset to annotations_directory_item
uint32_t class_data_off_; // file offset to class_data_item
uint32_t static_values_off_; // file offset to EncodedArray
// Raw type_item.
struct TypeItem {
uint16_t type_idx_; // index into type_ids section
// Raw type_list.
class TypeList {
uint32_t Size() const {
return size_;
const TypeItem& GetTypeItem(uint32_t idx) const {
DCHECK_LT(idx, this->size_);
return this->list_[idx];
uint32_t size_; // size of the list, in entries
TypeItem list_[1]; // elements of the list
// Raw code_item.
struct CodeItem {
uint16_t registers_size_;
uint16_t ins_size_;
uint16_t outs_size_;
uint16_t tries_size_;
uint32_t debug_info_off_; // file offset to debug info stream
uint32_t insns_size_in_code_units_; // size of the insns array, in 2 byte code units
uint16_t insns_[1];
// Raw try_item.
struct TryItem {
uint32_t start_addr_;
uint16_t insn_count_;
uint16_t handler_off_;
// Annotation constants.
enum {
kDexVisibilityBuild = 0x00, /* annotation visibility */
kDexVisibilityRuntime = 0x01,
kDexVisibilitySystem = 0x02,
kDexAnnotationByte = 0x00,
kDexAnnotationShort = 0x02,
kDexAnnotationChar = 0x03,
kDexAnnotationInt = 0x04,
kDexAnnotationLong = 0x06,
kDexAnnotationFloat = 0x10,
kDexAnnotationDouble = 0x11,
kDexAnnotationString = 0x17,
kDexAnnotationType = 0x18,
kDexAnnotationField = 0x19,
kDexAnnotationMethod = 0x1a,
kDexAnnotationEnum = 0x1b,
kDexAnnotationArray = 0x1c,
kDexAnnotationAnnotation = 0x1d,
kDexAnnotationNull = 0x1e,
kDexAnnotationBoolean = 0x1f,
kDexAnnotationValueTypeMask = 0x1f, /* low 5 bits */
kDexAnnotationValueArgShift = 5,
struct AnnotationsDirectoryItem {
uint32_t class_annotations_off_;
uint32_t fields_size_;
uint32_t methods_size_;
uint32_t parameters_size_;
struct FieldAnnotationsItem {
uint32_t field_idx_;
uint32_t annotations_off_;
struct MethodAnnotationsItem {
uint32_t method_idx_;
uint32_t annotations_off_;
struct ParameterAnnotationsItem {
uint32_t method_idx_;
uint32_t annotations_off_;
struct AnnotationSetRefItem {
uint32_t annotations_off_;
struct AnnotationSetRefList {
uint32_t size_;
AnnotationSetRefItem list_[1];
struct AnnotationSetItem {
uint32_t size_;
uint32_t entries_[1];
struct AnnotationItem {
uint8_t visibility_;
uint8_t annotation_[1];
typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry;
typedef std::vector<const DexFile*> ClassPath;
// Search a collection of DexFiles for a descriptor
static ClassPathEntry FindInClassPath(const char* descriptor,
const ClassPath& class_path);
// Returns the checksum of a file for comparison with GetLocationChecksum().
// For .dex files, this is the header checksum.
// For zip files, this is the classes.dex zip entry CRC32 checksum.
// Return true if the checksum could be found, false otherwise.
static bool GetChecksum(const char* filename, uint32_t* checksum, std::string* error_msg);
// Opens .dex file, guessing the container format based on file extension
static const DexFile* Open(const char* filename, const char* location, std::string* error_msg);
// Opens .dex file, backed by existing memory
static const DexFile* Open(const uint8_t* base, size_t size,
const std::string& location,
uint32_t location_checksum,
std::string* error_msg) {
return OpenMemory(base, size, location, location_checksum, NULL, error_msg);
// Opens .dex file from the classes.dex in a zip archive
static const DexFile* Open(const ZipArchive& zip_archive, const std::string& location,
std::string* error_msg);
// Closes a .dex file.
virtual ~DexFile();
const std::string& GetLocation() const {
return location_;
// For DexFiles directly from .dex files, this is the checksum from the DexFile::Header.
// For DexFiles opened from a zip files, this will be the ZipEntry CRC32 of classes.dex.
uint32_t GetLocationChecksum() const {
return location_checksum_;
const Header& GetHeader() const {
DCHECK(header_ != NULL) << GetLocation();
return *header_;
// Decode the dex magic version
uint32_t GetVersion() const;
// Returns true if the byte string points to the magic value.
static bool IsMagicValid(const byte* magic);
// Returns true if the byte string after the magic is the correct value.
static bool IsVersionValid(const byte* magic);
// Returns the number of string identifiers in the .dex file.
size_t NumStringIds() const {
DCHECK(header_ != NULL) << GetLocation();
return header_->string_ids_size_;
// Returns the StringId at the specified index.
const StringId& GetStringId(uint32_t idx) const {
DCHECK_LT(idx, NumStringIds()) << GetLocation();
return string_ids_[idx];
uint32_t GetIndexForStringId(const StringId& string_id) const {
CHECK_GE(&string_id, string_ids_) << GetLocation();
CHECK_LT(&string_id, string_ids_ + header_->string_ids_size_) << GetLocation();
return &string_id - string_ids_;
int32_t GetStringLength(const StringId& string_id) const;
// Returns a pointer to the UTF-8 string data referred to by the given string_id as well as the
// length of the string when decoded as a UTF-16 string. Note the UTF-16 length is not the same
// as the string length of the string data.
const char* GetStringDataAndUtf16Length(const StringId& string_id, uint32_t* utf16_length) const;
const char* GetStringData(const StringId& string_id) const {
uint32_t ignored;
return GetStringDataAndUtf16Length(string_id, &ignored);
// Index version of GetStringDataAndUtf16Length.
const char* StringDataAndUtf16LengthByIdx(uint32_t idx, uint32_t* utf16_length) const {
if (idx == kDexNoIndex) {
*utf16_length = 0;
return NULL;
const StringId& string_id = GetStringId(idx);
return GetStringDataAndUtf16Length(string_id, utf16_length);
const char* StringDataByIdx(uint32_t idx) const {
uint32_t unicode_length;
return StringDataAndUtf16LengthByIdx(idx, &unicode_length);
// Looks up a string id for a given modified utf8 string.
const StringId* FindStringId(const char* string) const;
// Looks up a string id for a given utf16 string.
const StringId* FindStringId(const uint16_t* string) const;
// Returns the number of type identifiers in the .dex file.
size_t NumTypeIds() const {
DCHECK(header_ != NULL) << GetLocation();
return header_->type_ids_size_;
// Returns the TypeId at the specified index.
const TypeId& GetTypeId(uint32_t idx) const {
DCHECK_LT(idx, NumTypeIds()) << GetLocation();
return type_ids_[idx];
uint16_t GetIndexForTypeId(const TypeId& type_id) const {
CHECK_GE(&type_id, type_ids_) << GetLocation();
CHECK_LT(&type_id, type_ids_ + header_->type_ids_size_) << GetLocation();
size_t result = &type_id - type_ids_;
DCHECK_LT(result, 65536U) << GetLocation();
return static_cast<uint16_t>(result);
// Get the descriptor string associated with a given type index.
const char* StringByTypeIdx(uint32_t idx, uint32_t* unicode_length) const {
const TypeId& type_id = GetTypeId(idx);
return StringDataAndUtf16LengthByIdx(type_id.descriptor_idx_, unicode_length);
const char* StringByTypeIdx(uint32_t idx) const {
const TypeId& type_id = GetTypeId(idx);
return StringDataByIdx(type_id.descriptor_idx_);
// Returns the type descriptor string of a type id.
const char* GetTypeDescriptor(const TypeId& type_id) const {
return StringDataByIdx(type_id.descriptor_idx_);
// Looks up a type for the given string index
const TypeId* FindTypeId(uint32_t string_idx) const;
// Returns the number of field identifiers in the .dex file.
size_t NumFieldIds() const {
DCHECK(header_ != NULL) << GetLocation();
return header_->field_ids_size_;
// Returns the FieldId at the specified index.
const FieldId& GetFieldId(uint32_t idx) const {
DCHECK_LT(idx, NumFieldIds()) << GetLocation();
return field_ids_[idx];
uint32_t GetIndexForFieldId(const FieldId& field_id) const {
CHECK_GE(&field_id, field_ids_) << GetLocation();
CHECK_LT(&field_id, field_ids_ + header_->field_ids_size_) << GetLocation();
return &field_id - field_ids_;
// Looks up a field by its declaring class, name and type
const FieldId* FindFieldId(const DexFile::TypeId& declaring_klass,
const DexFile::StringId& name,
const DexFile::TypeId& type) const;
// Returns the declaring class descriptor string of a field id.
const char* GetFieldDeclaringClassDescriptor(const FieldId& field_id) const {
const DexFile::TypeId& type_id = GetTypeId(field_id.class_idx_);
return GetTypeDescriptor(type_id);
// Returns the class descriptor string of a field id.
const char* GetFieldTypeDescriptor(const FieldId& field_id) const {
const DexFile::TypeId& type_id = GetTypeId(field_id.type_idx_);
return GetTypeDescriptor(type_id);
// Returns the name of a field id.
const char* GetFieldName(const FieldId& field_id) const {
return StringDataByIdx(field_id.name_idx_);
// Returns the number of method identifiers in the .dex file.
size_t NumMethodIds() const {
DCHECK(header_ != NULL) << GetLocation();
return header_->method_ids_size_;
// Returns the MethodId at the specified index.
const MethodId& GetMethodId(uint32_t idx) const {
DCHECK_LT(idx, NumMethodIds()) << GetLocation();
return method_ids_[idx];
uint32_t GetIndexForMethodId(const MethodId& method_id) const {
CHECK_GE(&method_id, method_ids_) << GetLocation();
CHECK_LT(&method_id, method_ids_ + header_->method_ids_size_) << GetLocation();
return &method_id - method_ids_;
// Looks up a method by its declaring class, name and proto_id
const MethodId* FindMethodId(const DexFile::TypeId& declaring_klass,
const DexFile::StringId& name,
const DexFile::ProtoId& signature) const;
// Returns the declaring class descriptor string of a method id.
const char* GetMethodDeclaringClassDescriptor(const MethodId& method_id) const {
const DexFile::TypeId& type_id = GetTypeId(method_id.class_idx_);
return GetTypeDescriptor(type_id);
// Returns the prototype of a method id.
const ProtoId& GetMethodPrototype(const MethodId& method_id) const {
return GetProtoId(method_id.proto_idx_);
// Returns a representation of the signature of a method id.
const Signature GetMethodSignature(const MethodId& method_id) const;
// Returns the name of a method id.
const char* GetMethodName(const MethodId& method_id) const {
return StringDataByIdx(method_id.name_idx_);
// Returns the shorty of a method id.
const char* GetMethodShorty(const MethodId& method_id) const {
return StringDataByIdx(GetProtoId(method_id.proto_idx_).shorty_idx_);
const char* GetMethodShorty(const MethodId& method_id, uint32_t* length) const {
// Using the UTF16 length is safe here as shorties are guaranteed to be ASCII characters.
return StringDataAndUtf16LengthByIdx(GetProtoId(method_id.proto_idx_).shorty_idx_, length);
// Returns the number of class definitions in the .dex file.
size_t NumClassDefs() const {
DCHECK(header_ != NULL) << GetLocation();
return header_->class_defs_size_;
// Returns the ClassDef at the specified index.
const ClassDef& GetClassDef(uint16_t idx) const {
DCHECK_LT(idx, NumClassDefs()) << GetLocation();
return class_defs_[idx];
uint16_t GetIndexForClassDef(const ClassDef& class_def) const {
CHECK_GE(&class_def, class_defs_) << GetLocation();
CHECK_LT(&class_def, class_defs_ + header_->class_defs_size_) << GetLocation();
return &class_def - class_defs_;
// Returns the class descriptor string of a class definition.
const char* GetClassDescriptor(const ClassDef& class_def) const {
return StringByTypeIdx(class_def.class_idx_);
// Looks up a class definition by its class descriptor.
const ClassDef* FindClassDef(const char* descriptor) const;
// Looks up a class definition by its type index.
const ClassDef* FindClassDef(uint16_t type_idx) const;
const TypeList* GetInterfacesList(const ClassDef& class_def) const {
if (class_def.interfaces_off_ == 0) {
return NULL;
} else {
const byte* addr = begin_ + class_def.interfaces_off_;
return reinterpret_cast<const TypeList*>(addr);
// Returns a pointer to the raw memory mapped class_data_item
const byte* GetClassData(const ClassDef& class_def) const {
if (class_def.class_data_off_ == 0) {
return NULL;
} else {
return begin_ + class_def.class_data_off_;
const CodeItem* GetCodeItem(const uint32_t code_off) const {
if (code_off == 0) {
return NULL; // native or abstract method
} else {
const byte* addr = begin_ + code_off;
return reinterpret_cast<const CodeItem*>(addr);
const char* GetReturnTypeDescriptor(const ProtoId& proto_id) const {
return StringByTypeIdx(proto_id.return_type_idx_);
// Returns the number of prototype identifiers in the .dex file.
size_t NumProtoIds() const {
DCHECK(header_ != NULL) << GetLocation();
return header_->proto_ids_size_;
// Returns the ProtoId at the specified index.
const ProtoId& GetProtoId(uint32_t idx) const {
DCHECK_LT(idx, NumProtoIds()) << GetLocation();
return proto_ids_[idx];
uint16_t GetIndexForProtoId(const ProtoId& proto_id) const {
CHECK_GE(&proto_id, proto_ids_) << GetLocation();
CHECK_LT(&proto_id, proto_ids_ + header_->proto_ids_size_) << GetLocation();
return &proto_id - proto_ids_;
// Looks up a proto id for a given return type and signature type list
const ProtoId* FindProtoId(uint16_t return_type_idx,
const uint16_t* signature_type_idxs, uint32_t signature_length) const;
const ProtoId* FindProtoId(uint16_t return_type_idx,
const std::vector<uint16_t>& signature_type_idxs) const {
return FindProtoId(return_type_idx, &signature_type_idxs[0], signature_type_idxs.size());
// Given a signature place the type ids into the given vector, returns true on success
bool CreateTypeList(const StringPiece& signature, uint16_t* return_type_idx,
std::vector<uint16_t>* param_type_idxs) const;
// Create a Signature from the given string signature or return Signature::NoSignature if not
// possible.
const Signature CreateSignature(const StringPiece& signature) const;
// Returns the short form method descriptor for the given prototype.
const char* GetShorty(uint32_t proto_idx) const {
const ProtoId& proto_id = GetProtoId(proto_idx);
return StringDataByIdx(proto_id.shorty_idx_);
const TypeList* GetProtoParameters(const ProtoId& proto_id) const {
if (proto_id.parameters_off_ == 0) {
return NULL;
} else {
const byte* addr = begin_ + proto_id.parameters_off_;
return reinterpret_cast<const TypeList*>(addr);
const byte* GetEncodedStaticFieldValuesArray(const ClassDef& class_def) const {
if (class_def.static_values_off_ == 0) {
return 0;
} else {
return begin_ + class_def.static_values_off_;
static const TryItem* GetTryItems(const CodeItem& code_item, uint32_t offset);
// Get the base of the encoded data for the given DexCode.
static const byte* GetCatchHandlerData(const CodeItem& code_item, uint32_t offset) {
const byte* handler_data =
reinterpret_cast<const byte*>(GetTryItems(code_item, code_item.tries_size_));
return handler_data + offset;
// Find which try region is associated with the given address (ie dex pc). Returns -1 if none.
static int32_t FindTryItem(const CodeItem &code_item, uint32_t address);
// Find the handler offset associated with the given address (ie dex pc). Returns -1 if none.
static int32_t FindCatchHandlerOffset(const CodeItem &code_item, uint32_t address);
// Get the pointer to the start of the debugging data
const byte* GetDebugInfoStream(const CodeItem* code_item) const {
if (code_item->debug_info_off_ == 0) {
return NULL;
} else {
return begin_ + code_item->debug_info_off_;
// Callback for "new position table entry".
// Returning true causes the decoder to stop early.
typedef bool (*DexDebugNewPositionCb)(void* context, uint32_t address, uint32_t line_num);
// Callback for "new locals table entry". "signature" is an empty string
// if no signature is available for an entry.
typedef void (*DexDebugNewLocalCb)(void* context, uint16_t reg,
uint32_t start_address,
uint32_t end_address,
const char* name,
const char* descriptor,
const char* signature);
static bool LineNumForPcCb(void* context, uint32_t address, uint32_t line_num);
// Debug info opcodes and constants
enum {
DBG_SET_FILE = 0x09,
struct LocalInfo {
: name_(NULL), descriptor_(NULL), signature_(NULL), start_address_(0), is_live_(false) {}
const char* name_; // E.g., list
const char* descriptor_; // E.g., Ljava/util/LinkedList;
const char* signature_; // E.g., java.util.LinkedList<java.lang.Integer>
uint16_t start_address_; // PC location where the local is first defined.
bool is_live_; // Is the local defined and live.
struct LineNumFromPcContext {
LineNumFromPcContext(uint32_t address, uint32_t line_num)
: address_(address), line_num_(line_num) {}
uint32_t address_;
uint32_t line_num_;
void InvokeLocalCbIfLive(void* context, int reg, uint32_t end_address,
LocalInfo* local_in_reg, DexDebugNewLocalCb local_cb) const {
if (local_cb != NULL && local_in_reg[reg].is_live_) {
local_cb(context, reg, local_in_reg[reg].start_address_, end_address,
local_in_reg[reg].name_, local_in_reg[reg].descriptor_,
local_in_reg[reg].signature_ != NULL ? local_in_reg[reg].signature_ : "");
// Determine the source file line number based on the program counter.
// "pc" is an offset, in 16-bit units, from the start of the method's code.
// Returns -1 if no match was found (possibly because the source files were
// compiled without "-g", so no line number information is present).
// Returns -2 for native methods (as expected in exception traces).
// This is used by runtime; therefore use art::Method not art::DexFile::Method.
int32_t GetLineNumFromPC(mirror::ArtMethod* method, uint32_t rel_pc) const
void DecodeDebugInfo(const CodeItem* code_item, bool is_static, uint32_t method_idx,
DexDebugNewPositionCb position_cb, DexDebugNewLocalCb local_cb,
void* context) const;
const char* GetSourceFile(const ClassDef& class_def) const {
if (class_def.source_file_idx_ == 0xffffffff) {
return NULL;
} else {
return StringDataByIdx(class_def.source_file_idx_);
int GetPermissions() const;
bool IsReadOnly() const;
bool EnableWrite() const;
bool DisableWrite() const;
const byte* Begin() const {
return begin_;
size_t Size() const {
return size_;
// Opens a .dex file
static const DexFile* OpenFile(int fd, const char* location, bool verify, std::string* error_msg);
// Opens a dex file from within a .jar, .zip, or .apk file
static const DexFile* OpenZip(int fd, const std::string& location, std::string* error_msg);
// Opens a .dex file at the given address backed by a MemMap
static const DexFile* OpenMemory(const std::string& location,
uint32_t location_checksum,
MemMap* mem_map,
std::string* error_msg);
// Opens a .dex file at the given address, optionally backed by a MemMap
static const DexFile* OpenMemory(const byte* dex_file,
size_t size,
const std::string& location,
uint32_t location_checksum,
MemMap* mem_map,
std::string* error_msg);
DexFile(const byte* base, size_t size,
const std::string& location,
uint32_t location_checksum,
MemMap* mem_map);
// Top-level initializer that calls other Init methods.
bool Init(std::string* error_msg);
// Returns true if the header magic and version numbers are of the expected values.
bool CheckMagicAndVersion(std::string* error_msg) const;
void DecodeDebugInfo0(const CodeItem* code_item, bool is_static, uint32_t method_idx,
DexDebugNewPositionCb position_cb, DexDebugNewLocalCb local_cb,
void* context, const byte* stream, LocalInfo* local_in_reg) const;
// The base address of the memory mapping.
const byte* const begin_;
// The size of the underlying memory allocation in bytes.
const size_t size_;
// Typically the dex file name when available, alternatively some identifying string.
// The ClassLinker will use this to match DexFiles the boot class
// path to DexCache::GetLocation when loading from an image.
const std::string location_;
const uint32_t location_checksum_;
// Manages the underlying memory allocation.
std::unique_ptr<MemMap> mem_map_;
// Points to the header section.
const Header* const header_;
// Points to the base of the string identifier list.
const StringId* const string_ids_;
// Points to the base of the type identifier list.
const TypeId* const type_ids_;
// Points to the base of the field identifier list.
const FieldId* const field_ids_;
// Points to the base of the method identifier list.
const MethodId* const method_ids_;
// Points to the base of the prototype identifier list.
const ProtoId* const proto_ids_;
// Points to the base of the class definition list.
const ClassDef* const class_defs_;
std::ostream& operator<<(std::ostream& os, const DexFile& dex_file);
// Iterate over a dex file's ProtoId's paramters
class DexFileParameterIterator {
DexFileParameterIterator(const DexFile& dex_file, const DexFile::ProtoId& proto_id)
: dex_file_(dex_file), size_(0), pos_(0) {
type_list_ = dex_file_.GetProtoParameters(proto_id);
if (type_list_ != NULL) {
size_ = type_list_->Size();
bool HasNext() const { return pos_ < size_; }
void Next() { ++pos_; }
uint16_t GetTypeIdx() {
return type_list_->GetTypeItem(pos_).type_idx_;
const char* GetDescriptor() {
return dex_file_.StringByTypeIdx(GetTypeIdx());
const DexFile& dex_file_;
const DexFile::TypeList* type_list_;
uint32_t size_;
uint32_t pos_;
// Abstract the signature of a method.
class Signature {
std::string ToString() const;
static Signature NoSignature() {
return Signature();
bool operator==(const Signature& rhs) const;
bool operator!=(const Signature& rhs) const {
return !(*this == rhs);
bool operator==(const StringPiece& rhs) const;
Signature(const DexFile* dex, const DexFile::ProtoId& proto) : dex_file_(dex), proto_id_(&proto) {
Signature() : dex_file_(nullptr), proto_id_(nullptr) {
friend class DexFile;
const DexFile* const dex_file_;
const DexFile::ProtoId* const proto_id_;
std::ostream& operator<<(std::ostream& os, const Signature& sig);
// Iterate and decode class_data_item
class ClassDataItemIterator {
ClassDataItemIterator(const DexFile& dex_file, const byte* raw_class_data_item)
: dex_file_(dex_file), pos_(0), ptr_pos_(raw_class_data_item), last_idx_(0) {
if (EndOfInstanceFieldsPos() > 0) {
} else if (EndOfVirtualMethodsPos() > 0) {
uint32_t NumStaticFields() const {
return header_.static_fields_size_;
uint32_t NumInstanceFields() const {
return header_.instance_fields_size_;
uint32_t NumDirectMethods() const {
return header_.direct_methods_size_;
uint32_t NumVirtualMethods() const {
return header_.virtual_methods_size_;
bool HasNextStaticField() const {
return pos_ < EndOfStaticFieldsPos();
bool HasNextInstanceField() const {
return pos_ >= EndOfStaticFieldsPos() && pos_ < EndOfInstanceFieldsPos();
bool HasNextDirectMethod() const {
return pos_ >= EndOfInstanceFieldsPos() && pos_ < EndOfDirectMethodsPos();
bool HasNextVirtualMethod() const {
return pos_ >= EndOfDirectMethodsPos() && pos_ < EndOfVirtualMethodsPos();
bool HasNext() const {
return pos_ < EndOfVirtualMethodsPos();
inline void Next() {
if (pos_ < EndOfStaticFieldsPos()) {
last_idx_ = GetMemberIndex();
} else if (pos_ == EndOfStaticFieldsPos() && NumInstanceFields() > 0) {
last_idx_ = 0; // transition to next array, reset last index
} else if (pos_ < EndOfInstanceFieldsPos()) {
last_idx_ = GetMemberIndex();
} else if (pos_ == EndOfInstanceFieldsPos() && NumDirectMethods() > 0) {
last_idx_ = 0; // transition to next array, reset last index
} else if (pos_ < EndOfDirectMethodsPos()) {
last_idx_ = GetMemberIndex();
} else if (pos_ == EndOfDirectMethodsPos() && NumVirtualMethods() > 0) {
last_idx_ = 0; // transition to next array, reset last index
} else if (pos_ < EndOfVirtualMethodsPos()) {
last_idx_ = GetMemberIndex();
} else {
uint32_t GetMemberIndex() const {
if (pos_ < EndOfInstanceFieldsPos()) {
return last_idx_ + field_.field_idx_delta_;
} else {
DCHECK_LT(pos_, EndOfVirtualMethodsPos());
return last_idx_ + method_.method_idx_delta_;
uint32_t GetMemberAccessFlags() const {
if (pos_ < EndOfInstanceFieldsPos()) {
return field_.access_flags_;
} else {
DCHECK_LT(pos_, EndOfVirtualMethodsPos());
return method_.access_flags_;
InvokeType GetMethodInvokeType(const DexFile::ClassDef& class_def) const {
if (HasNextDirectMethod()) {
if ((GetMemberAccessFlags() & kAccStatic) != 0) {
return kStatic;
} else {
return kDirect;
} else {
DCHECK_EQ(GetMemberAccessFlags() & kAccStatic, 0U);
if ((class_def.access_flags_ & kAccInterface) != 0) {
return kInterface;
} else if ((GetMemberAccessFlags() & kAccConstructor) != 0) {
return kSuper;
} else {
return kVirtual;
const DexFile::CodeItem* GetMethodCodeItem() const {
return dex_file_.GetCodeItem(method_.code_off_);
uint32_t GetMethodCodeItemOffset() const {
return method_.code_off_;
const byte* EndDataPointer() const {
return ptr_pos_;
// A dex file's class_data_item is leb128 encoded, this structure holds a decoded form of the
// header for a class_data_item
struct ClassDataHeader {
uint32_t static_fields_size_; // the number of static fields
uint32_t instance_fields_size_; // the number of instance fields
uint32_t direct_methods_size_; // the number of direct methods
uint32_t virtual_methods_size_; // the number of virtual methods
} header_;
// Read and decode header from a class_data_item stream into header
void ReadClassDataHeader();
uint32_t EndOfStaticFieldsPos() const {
return header_.static_fields_size_;
uint32_t EndOfInstanceFieldsPos() const {
return EndOfStaticFieldsPos() + header_.instance_fields_size_;
uint32_t EndOfDirectMethodsPos() const {
return EndOfInstanceFieldsPos() + header_.direct_methods_size_;
uint32_t EndOfVirtualMethodsPos() const {
return EndOfDirectMethodsPos() + header_.virtual_methods_size_;
// A decoded version of the field of a class_data_item
struct ClassDataField {
uint32_t field_idx_delta_; // delta of index into the field_ids array for FieldId
uint32_t access_flags_; // access flags for the field
ClassDataField() : field_idx_delta_(0), access_flags_(0) {}
ClassDataField field_;
// Read and decode a field from a class_data_item stream into field
void ReadClassDataField();
// A decoded version of the method of a class_data_item
struct ClassDataMethod {
uint32_t method_idx_delta_; // delta of index into the method_ids array for MethodId
uint32_t access_flags_;
uint32_t code_off_;
ClassDataMethod() : method_idx_delta_(0), access_flags_(0), code_off_(0) {}
ClassDataMethod method_;
// Read and decode a method from a class_data_item stream into method
void ReadClassDataMethod();
const DexFile& dex_file_;
size_t pos_; // integral number of items passed
const byte* ptr_pos_; // pointer into stream of class_data_item
uint32_t last_idx_; // last read field or method index to apply delta to
class EncodedStaticFieldValueIterator {
EncodedStaticFieldValueIterator(const DexFile& dex_file, Handle<mirror::DexCache>* dex_cache,
Handle<mirror::ClassLoader>* class_loader,
ClassLinker* linker, const DexFile::ClassDef& class_def)
template<bool kTransactionActive>
void ReadValueToField(mirror::ArtField* field) const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool HasNext() { return pos_ < array_size_; }
void Next();
enum ValueType {
kByte = 0x00,
kShort = 0x02,
kChar = 0x03,
kInt = 0x04,
kLong = 0x06,
kFloat = 0x10,
kDouble = 0x11,
kString = 0x17,
kType = 0x18,
kField = 0x19,
kMethod = 0x1a,
kEnum = 0x1b,
kArray = 0x1c,
kAnnotation = 0x1d,
kNull = 0x1e,
kBoolean = 0x1f
static const byte kEncodedValueTypeMask = 0x1f; // 0b11111
static const byte kEncodedValueArgShift = 5;
const DexFile& dex_file_;
Handle<mirror::DexCache>* const dex_cache_; // Dex cache to resolve literal objects.
Handle<mirror::ClassLoader>* const class_loader_; // ClassLoader to resolve types.
ClassLinker* linker_; // Linker to resolve literal objects.
size_t array_size_; // Size of array.
size_t pos_; // Current position.
const byte* ptr_; // Pointer into encoded data array.
ValueType type_; // Type of current encoded value.
jvalue jval_; // Value of current encoded value.
std::ostream& operator<<(std::ostream& os, const EncodedStaticFieldValueIterator::ValueType& code);
class CatchHandlerIterator {
CatchHandlerIterator(const DexFile::CodeItem& code_item, uint32_t address);
CatchHandlerIterator(const DexFile::CodeItem& code_item,
const DexFile::TryItem& try_item);
explicit CatchHandlerIterator(const byte* handler_data) {
uint16_t GetHandlerTypeIndex() const {
return handler_.type_idx_;
uint32_t GetHandlerAddress() const {
return handler_.address_;
void Next();
bool HasNext() const {
return remaining_count_ != -1 || catch_all_;
// End of this set of catch blocks, convenience method to locate next set of catch blocks
const byte* EndDataPointer() const {
return current_data_;
void Init(const DexFile::CodeItem& code_item, int32_t offset);
void Init(const byte* handler_data);
struct CatchHandlerItem {
uint16_t type_idx_; // type index of the caught exception type
uint32_t address_; // handler address
} handler_;
const byte *current_data_; // the current handler in dex file.
int32_t remaining_count_; // number of handlers not read.
bool catch_all_; // is there a handler that will catch all exceptions in case
// that all typed handler does not match.
} // namespace art