blob: 4ca735ad66bdb1adedeb1935f161fa82b2ebe0a0 [file] [log] [blame]
* 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 <android-base/logging.h>
#include "base/globals.h"
#include "base/iteration_range.h"
#include "base/macros.h"
#include "base/value_object.h"
#include "dex_file_types.h"
#include "dex_instruction_iterator.h"
#include "hidden_api_access_flags.h"
#include "jni.h"
#include "modifiers.h"
namespace art {
class ClassDataItemIterator;
class CompactDexFile;
enum InvokeType : uint32_t;
class MemMap;
class OatDexFile;
class Signature;
class StandardDexFile;
class StringPiece;
class ZipArchive;
// Some instances of DexFile own the storage referred to by DexFile. Clients who create
// such management do so by subclassing Container.
class DexFileContainer {
DexFileContainer() { }
virtual ~DexFileContainer() { }
virtual int GetPermissions() = 0;
virtual bool IsReadOnly() = 0;
virtual bool EnableWrite() = 0;
virtual bool DisableWrite() = 0;
// Dex file is the API that exposes native dex files (ordinary dex files) and CompactDex.
// Originally, the dex file format used by ART was mostly the same as APKs. The only change was
// quickened opcodes and layout optimizations.
// Since ART needs to support both native dex files and CompactDex files, the DexFile interface
// provides an abstraction to facilitate this.
class DexFile {
// Number of bytes in the dex file magic.
static constexpr size_t kDexMagicSize = 4;
static constexpr size_t kDexVersionLen = 4;
// First Dex format version enforcing class definition ordering rules.
static const uint32_t kClassDefinitionOrderEnforcedVersion = 37;
static constexpr size_t kSha1DigestSize = 20;
static constexpr uint32_t kDexEndianConstant = 0x12345678;
// The value of an invalid index.
static const uint16_t kDexNoIndex16 = 0xFFFF;
// Raw header_item.
struct Header {
uint8_t magic_[8] = {};
uint32_t checksum_ = 0; // See also location_checksum_
uint8_t signature_[kSha1DigestSize] = {};
uint32_t file_size_ = 0; // size of entire file
uint32_t header_size_ = 0; // offset to start of next section
uint32_t endian_tag_ = 0;
uint32_t link_size_ = 0; // unused
uint32_t link_off_ = 0; // unused
uint32_t map_off_ = 0; // unused
uint32_t string_ids_size_ = 0; // number of StringIds
uint32_t string_ids_off_ = 0; // file offset of StringIds array
uint32_t type_ids_size_ = 0; // number of TypeIds, we don't support more than 65535
uint32_t type_ids_off_ = 0; // file offset of TypeIds array
uint32_t proto_ids_size_ = 0; // number of ProtoIds, we don't support more than 65535
uint32_t proto_ids_off_ = 0; // file offset of ProtoIds array
uint32_t field_ids_size_ = 0; // number of FieldIds
uint32_t field_ids_off_ = 0; // file offset of FieldIds array
uint32_t method_ids_size_ = 0; // number of MethodIds
uint32_t method_ids_off_ = 0; // file offset of MethodIds array
uint32_t class_defs_size_ = 0; // number of ClassDefs
uint32_t class_defs_off_ = 0; // file offset of ClassDef array
uint32_t data_size_ = 0; // size of data section
uint32_t data_off_ = 0; // file offset of data section
// Decode the dex magic version
uint32_t GetVersion() const;
// Map item type codes.
enum MapItemType : uint16_t { // private
kDexTypeHeaderItem = 0x0000,
kDexTypeStringIdItem = 0x0001,
kDexTypeTypeIdItem = 0x0002,
kDexTypeProtoIdItem = 0x0003,
kDexTypeFieldIdItem = 0x0004,
kDexTypeMethodIdItem = 0x0005,
kDexTypeClassDefItem = 0x0006,
kDexTypeCallSiteIdItem = 0x0007,
kDexTypeMethodHandleItem = 0x0008,
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 {
dex::StringIndex descriptor_idx_; // index into string_ids
// Raw field_id_item.
struct FieldId {
dex::TypeIndex class_idx_; // index into type_ids_ array for defining class
dex::TypeIndex type_idx_; // index into type_ids_ array for field type
dex::StringIndex name_idx_; // index into string_ids_ array for field name
// Raw proto_id_item.
struct ProtoId {
dex::StringIndex shorty_idx_; // index into string_ids array for shorty descriptor
dex::TypeIndex 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 method_id_item.
struct MethodId {
dex::TypeIndex class_idx_; // index into type_ids_ array for defining class
uint16_t proto_idx_; // index into proto_ids_ array for method prototype
dex::StringIndex name_idx_; // index into string_ids_ array for method name
// Base code_item, compact dex and standard dex have different code item layouts.
struct CodeItem {
CodeItem() = default;
// Raw class_def_item.
struct ClassDef {
dex::TypeIndex class_idx_; // index into type_ids_ array for this class
uint16_t pad1_; // padding = 0
uint32_t access_flags_;
dex::TypeIndex superclass_idx_; // index into type_ids_ array for superclass
uint16_t pad2_; // padding = 0
uint32_t interfaces_off_; // file offset to TypeList
dex::StringIndex 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
// Returns the valid access flags, that is, Java modifier bits relevant to the ClassDef type
// (class or interface). These are all in the lower 16b and do not contain runtime flags.
uint32_t GetJavaAccessFlags() const {
// Make sure that none of our runtime-only flags are set.
static_assert((kAccValidClassFlags & kAccJavaFlagsMask) == kAccValidClassFlags,
"Valid class flags not a subset of Java flags");
static_assert((kAccValidInterfaceFlags & kAccJavaFlagsMask) == kAccValidInterfaceFlags,
"Valid interface flags not a subset of Java flags");
if ((access_flags_ & kAccInterface) != 0) {
// Interface.
return access_flags_ & kAccValidInterfaceFlags;
} else {
// Class.
return access_flags_ & kAccValidClassFlags;
template <typename Visitor>
void VisitMethods(const DexFile* dex_file, const Visitor& visitor) const;
// Raw type_item.
struct TypeItem {
dex::TypeIndex 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];
// Size in bytes of the part of the list that is common.
static constexpr size_t GetHeaderSize() {
return 4U;
// Size in bytes of the whole type list including all the stored elements.
static constexpr size_t GetListSize(size_t count) {
return GetHeaderSize() + sizeof(TypeItem) * count;
uint32_t size_; // size of the list, in entries
TypeItem list_[1]; // elements of the list
// MethodHandle Types
enum class MethodHandleType : uint16_t { // private
kStaticPut = 0x0000, // a setter for a given static field.
kStaticGet = 0x0001, // a getter for a given static field.
kInstancePut = 0x0002, // a setter for a given instance field.
kInstanceGet = 0x0003, // a getter for a given instance field.
kInvokeStatic = 0x0004, // an invoker for a given static method.
kInvokeInstance = 0x0005, // invoke_instance : an invoker for a given instance method. This
// can be any non-static method on any class (or interface) except
// for “<init>”.
kInvokeConstructor = 0x0006, // an invoker for a given constructor.
kInvokeDirect = 0x0007, // an invoker for a direct (special) method.
kInvokeInterface = 0x0008, // an invoker for an interface method.
kLast = kInvokeInterface
// raw method_handle_item
struct MethodHandleItem {
uint16_t method_handle_type_;
uint16_t reserved1_; // Reserved for future use.
uint16_t field_or_method_idx_; // Field index for accessors, method index otherwise.
uint16_t reserved2_; // Reserved for future use.
// raw call_site_id_item
struct CallSiteIdItem {
uint32_t data_off_; // Offset into data section pointing to encoded array items.
// Raw try_item.
struct TryItem {
static constexpr size_t kAlignment = sizeof(uint32_t);
uint32_t start_addr_;
uint16_t insn_count_;
uint16_t handler_off_;
TryItem() = default;
friend class DexWriter;
// 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,
kDexAnnotationMethodType = 0x15,
kDexAnnotationMethodHandle = 0x16,
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];
enum AnnotationResultStyle { // private
struct AnnotationValue;
// 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_ != nullptr) << GetLocation();
return *header_;
// Decode the dex magic version
uint32_t GetDexVersion() const {
return GetHeader().GetVersion();
// Returns true if the byte string points to the magic value.
virtual bool IsMagicValid() const = 0;
// Returns true if the byte string after the magic is the correct value.
virtual bool IsVersionValid() const = 0;
// Returns true if the dex file supports default methods.
virtual bool SupportsDefaultMethods() const = 0;
// Returns the maximum size in bytes needed to store an equivalent dex file strictly conforming to
// the dex file specification. That is the size if we wanted to get rid of all the
// quickening/compact-dexing/etc.
// TODO This should really be an exact size! b/72402467
virtual size_t GetDequickenedSize() const = 0;
// Returns the number of string identifiers in the .dex file.
size_t NumStringIds() const {
DCHECK(header_ != nullptr) << GetLocation();
return header_->string_ids_size_;
// Returns the StringId at the specified index.
const StringId& GetStringId(dex::StringIndex idx) const {
DCHECK_LT(idx.index_, NumStringIds()) << GetLocation();
return string_ids_[idx.index_];
dex::StringIndex 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 dex::StringIndex(&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;
// Index version of GetStringDataAndUtf16Length.
const char* StringDataAndUtf16LengthByIdx(dex::StringIndex idx, uint32_t* utf16_length) const;
const char* StringDataByIdx(dex::StringIndex idx) const;
// Looks up a string id for a given modified utf8 string.
const StringId* FindStringId(const char* string) const;
const TypeId* FindTypeId(const char* string) const;
// Returns the number of type identifiers in the .dex file.
uint32_t NumTypeIds() const {
DCHECK(header_ != nullptr) << GetLocation();
return header_->type_ids_size_;
bool IsTypeIndexValid(dex::TypeIndex idx) const {
return idx.IsValid() && idx.index_ < NumTypeIds();
// Returns the TypeId at the specified index.
const TypeId& GetTypeId(dex::TypeIndex idx) const {
DCHECK_LT(idx.index_, NumTypeIds()) << GetLocation();
return type_ids_[idx.index_];
dex::TypeIndex 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 dex::TypeIndex(static_cast<uint16_t>(result));
// Get the descriptor string associated with a given type index.
const char* StringByTypeIdx(dex::TypeIndex idx, uint32_t* unicode_length) const;
const char* StringByTypeIdx(dex::TypeIndex idx) const;
// Returns the type descriptor string of a type id.
const char* GetTypeDescriptor(const TypeId& type_id) const;
// Looks up a type for the given string index
const TypeId* FindTypeId(dex::StringIndex string_idx) const;
// Returns the number of field identifiers in the .dex file.
size_t NumFieldIds() const {
DCHECK(header_ != nullptr) << 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;
uint32_t FindCodeItemOffset(const DexFile::ClassDef& class_def,
uint32_t dex_method_idx) const;
virtual uint32_t GetCodeItemSize(const DexFile::CodeItem& disk_code_item) const = 0;
// 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;
// Returns the name of a field id.
const char* GetFieldName(const FieldId& field_id) const;
// Returns the number of method identifiers in the .dex file.
size_t NumMethodIds() const {
DCHECK(header_ != nullptr) << 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;
// 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 a representation of the signature of a proto id.
const Signature GetProtoSignature(const ProtoId& proto_id) const;
// Returns the name of a method id.
const char* GetMethodName(const MethodId& method_id) const;
// Returns the shorty of a method by its index.
const char* GetMethodShorty(uint32_t idx) const;
// Returns the shorty of a method id.
const char* GetMethodShorty(const MethodId& method_id) const;
const char* GetMethodShorty(const MethodId& method_id, uint32_t* length) const;
// Returns the number of class definitions in the .dex file.
uint32_t NumClassDefs() const {
DCHECK(header_ != nullptr) << 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;
// Looks up a class definition by its type index.
const ClassDef* FindClassDef(dex::TypeIndex type_idx) const;
const TypeList* GetInterfacesList(const ClassDef& class_def) const {
return DataPointer<TypeList>(class_def.interfaces_off_);
uint32_t NumMethodHandles() const {
return num_method_handles_;
const MethodHandleItem& GetMethodHandle(uint32_t idx) const {
CHECK_LT(idx, NumMethodHandles());
return method_handles_[idx];
uint32_t NumCallSiteIds() const {
return num_call_site_ids_;
const CallSiteIdItem& GetCallSiteId(uint32_t idx) const {
CHECK_LT(idx, NumCallSiteIds());
return call_site_ids_[idx];
// Returns a pointer to the raw memory mapped class_data_item
const uint8_t* GetClassData(const ClassDef& class_def) const {
return DataPointer<uint8_t>(class_def.class_data_off_);
// Return the code item for a provided offset.
const CodeItem* GetCodeItem(const uint32_t code_off) const {
// May be null for native or abstract methods.
return DataPointer<CodeItem>(code_off);
const char* GetReturnTypeDescriptor(const ProtoId& proto_id) const;
// Returns the number of prototype identifiers in the .dex file.
size_t NumProtoIds() const {
DCHECK(header_ != nullptr) << GetLocation();
return header_->proto_ids_size_;
// Returns the ProtoId at the specified index.
const ProtoId& GetProtoId(uint16_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(dex::TypeIndex return_type_idx,
const dex::TypeIndex* signature_type_idxs,
uint32_t signature_length) const;
const ProtoId* FindProtoId(dex::TypeIndex return_type_idx,
const std::vector<dex::TypeIndex>& 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,
dex::TypeIndex* return_type_idx,
std::vector<dex::TypeIndex>* 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 TypeList* GetProtoParameters(const ProtoId& proto_id) const {
return DataPointer<TypeList>(proto_id.parameters_off_);
const uint8_t* GetEncodedStaticFieldValuesArray(const ClassDef& class_def) const {
return DataPointer<uint8_t>(class_def.static_values_off_);
const uint8_t* GetCallSiteEncodedValuesArray(const CallSiteIdItem& call_site_id) const {
return DataBegin() + call_site_id.data_off_;
static const TryItem* GetTryItems(const DexInstructionIterator& code_item_end, uint32_t offset);
// Get the base of the encoded data for the given DexCode.
static const uint8_t* GetCatchHandlerData(const DexInstructionIterator& code_item_end,
uint32_t tries_size,
uint32_t offset);
// Find which try region is associated with the given address (ie dex pc). Returns -1 if none.
static int32_t FindTryItem(const TryItem* try_items, uint32_t tries_size, uint32_t address);
// Get the pointer to the start of the debugging data
const uint8_t* GetDebugInfoStream(uint32_t debug_info_off) const {
// Check that the offset is in bounds.
// Note that although the specification says that 0 should be used if there
// is no debug information, some applications incorrectly use 0xFFFFFFFF.
return (debug_info_off == 0 || debug_info_off >= data_size_)
? nullptr
: DataBegin() + debug_info_off;
struct PositionInfo {
PositionInfo() = default;
uint32_t address_ = 0; // In 16-bit code units.
uint32_t line_ = 0; // Source code line number starting at 1.
const char* source_file_ = nullptr; // nullptr if the file from ClassDef still applies.
bool prologue_end_ = false;
bool epilogue_begin_ = false;
struct LocalInfo {
LocalInfo() = default;
const char* name_ = nullptr; // E.g., list. It can be nullptr if unknown.
const char* descriptor_ = nullptr; // E.g., Ljava/util/LinkedList;
const char* signature_ = nullptr; // E.g., java.util.LinkedList<java.lang.Integer>
uint32_t start_address_ = 0; // PC location where the local is first defined.
uint32_t end_address_ = 0; // PC location where the local is no longer defined.
uint16_t reg_ = 0; // Dex register which stores the values.
bool is_live_ = false; // Is the local defined and live.
// Callback for "new locals table entry".
typedef void (*DexDebugNewLocalCb)(void* context, const LocalInfo& entry);
static bool LineNumForPcCb(void* context, const PositionInfo& entry);
const AnnotationsDirectoryItem* GetAnnotationsDirectory(const ClassDef& class_def) const {
return DataPointer<AnnotationsDirectoryItem>(class_def.annotations_off_);
const AnnotationSetItem* GetClassAnnotationSet(const AnnotationsDirectoryItem* anno_dir) const {
return DataPointer<AnnotationSetItem>(anno_dir->class_annotations_off_);
const FieldAnnotationsItem* GetFieldAnnotations(const AnnotationsDirectoryItem* anno_dir) const {
return (anno_dir->fields_size_ == 0)
? nullptr
: reinterpret_cast<const FieldAnnotationsItem*>(&anno_dir[1]);
const MethodAnnotationsItem* GetMethodAnnotations(const AnnotationsDirectoryItem* anno_dir)
const {
if (anno_dir->methods_size_ == 0) {
return nullptr;
// Skip past the header and field annotations.
const uint8_t* addr = reinterpret_cast<const uint8_t*>(&anno_dir[1]);
addr += anno_dir->fields_size_ * sizeof(FieldAnnotationsItem);
return reinterpret_cast<const MethodAnnotationsItem*>(addr);
const ParameterAnnotationsItem* GetParameterAnnotations(const AnnotationsDirectoryItem* anno_dir)
const {
if (anno_dir->parameters_size_ == 0) {
return nullptr;
// Skip past the header, field annotations, and method annotations.
const uint8_t* addr = reinterpret_cast<const uint8_t*>(&anno_dir[1]);
addr += anno_dir->fields_size_ * sizeof(FieldAnnotationsItem);
addr += anno_dir->methods_size_ * sizeof(MethodAnnotationsItem);
return reinterpret_cast<const ParameterAnnotationsItem*>(addr);
const AnnotationSetItem* GetFieldAnnotationSetItem(const FieldAnnotationsItem& anno_item) const {
return DataPointer<AnnotationSetItem>(anno_item.annotations_off_);
const AnnotationSetItem* GetMethodAnnotationSetItem(const MethodAnnotationsItem& anno_item)
const {
return DataPointer<AnnotationSetItem>(anno_item.annotations_off_);
const AnnotationSetRefList* GetParameterAnnotationSetRefList(
const ParameterAnnotationsItem* anno_item) const {
return DataPointer<AnnotationSetRefList>(anno_item->annotations_off_);
ALWAYS_INLINE const AnnotationItem* GetAnnotationItemAtOffset(uint32_t offset) const {
return DataPointer<AnnotationItem>(offset);
const AnnotationItem* GetAnnotationItem(const AnnotationSetItem* set_item, uint32_t index) const {
DCHECK_LE(index, set_item->size_);
return GetAnnotationItemAtOffset(set_item->entries_[index]);
const AnnotationSetItem* GetSetRefItemItem(const AnnotationSetRefItem* anno_item) const {
return DataPointer<AnnotationSetItem>(anno_item->annotations_off_);
// Debug info opcodes and constants
enum {
DBG_SET_FILE = 0x09,
struct LineNumFromPcContext {
LineNumFromPcContext(uint32_t address, uint32_t line_num)
: address_(address), line_num_(line_num) {}
uint32_t address_;
uint32_t line_num_;
// Returns false if there is no debugging information or if it cannot be decoded.
template<typename NewLocalCallback, typename IndexToStringData, typename TypeIndexToStringData>
static bool DecodeDebugLocalInfo(const uint8_t* stream,
const std::string& location,
const char* declaring_class_descriptor,
const std::vector<const char*>& arg_descriptors,
const std::string& method_name,
bool is_static,
uint16_t registers_size,
uint16_t ins_size,
uint16_t insns_size_in_code_units,
IndexToStringData index_to_string_data,
TypeIndexToStringData type_index_to_string_data,
NewLocalCallback new_local,
void* context);
template<typename NewLocalCallback>
bool DecodeDebugLocalInfo(uint32_t registers_size,
uint32_t ins_size,
uint32_t insns_size_in_code_units,
uint32_t debug_info_offset,
bool is_static,
uint32_t method_idx,
NewLocalCallback new_local,
void* context) const;
// Returns false if there is no debugging information or if it cannot be decoded.
template<typename DexDebugNewPosition, typename IndexToStringData>
static bool DecodeDebugPositionInfo(const uint8_t* stream,
IndexToStringData index_to_string_data,
DexDebugNewPosition position_functor,
void* context);
template<typename DexDebugNewPosition>
bool DecodeDebugPositionInfo(uint32_t debug_info_offset,
DexDebugNewPosition position_functor,
void* context) const;
const char* GetSourceFile(const ClassDef& class_def) const {
if (!class_def.source_file_idx_.IsValid()) {
return nullptr;
} else {
return StringDataByIdx(class_def.source_file_idx_);
int GetPermissions() const;
bool IsReadOnly() const;
bool EnableWrite() const;
bool DisableWrite() const;
const uint8_t* Begin() const {
return begin_;
size_t Size() const {
return size_;
const uint8_t* DataBegin() const {
return data_begin_;
size_t DataSize() const {
return data_size_;
template <typename T>
const T* DataPointer(size_t offset) const {
DCHECK_LT(offset, DataSize()) << "Offset past end of data section";
return (offset != 0u) ? reinterpret_cast<const T*>(DataBegin() + offset) : nullptr;
const OatDexFile* GetOatDexFile() const {
return oat_dex_file_;
// Used by oat writer.
void SetOatDexFile(OatDexFile* oat_dex_file) const {
oat_dex_file_ = oat_dex_file;
// Read MapItems and validate/set remaining offsets.
const DexFile::MapList* GetMapList() const {
return reinterpret_cast<const DexFile::MapList*>(DataBegin() + header_->map_off_);
// Utility methods for reading integral values from a buffer.
static int32_t ReadSignedInt(const uint8_t* ptr, int zwidth);
static uint32_t ReadUnsignedInt(const uint8_t* ptr, int zwidth, bool fill_on_right);
static int64_t ReadSignedLong(const uint8_t* ptr, int zwidth);
static uint64_t ReadUnsignedLong(const uint8_t* ptr, int zwidth, bool fill_on_right);
// Recalculates the checksum of the dex file. Does not use the current value in the header.
virtual uint32_t CalculateChecksum() const;
static uint32_t CalculateChecksum(const uint8_t* begin, size_t size);
static uint32_t ChecksumMemoryRange(const uint8_t* begin, size_t size);
// Returns a human-readable form of the method at an index.
std::string PrettyMethod(uint32_t method_idx, bool with_signature = true) const;
// Returns a human-readable form of the field at an index.
std::string PrettyField(uint32_t field_idx, bool with_type = true) const;
// Returns a human-readable form of the type at an index.
std::string PrettyType(dex::TypeIndex type_idx) const;
// Not virtual for performance reasons.
ALWAYS_INLINE bool IsCompactDexFile() const {
return is_compact_dex_;
ALWAYS_INLINE bool IsStandardDexFile() const {
return !is_compact_dex_;
ALWAYS_INLINE const StandardDexFile* AsStandardDexFile() const;
ALWAYS_INLINE const CompactDexFile* AsCompactDexFile() const;
ALWAYS_INLINE bool IsPlatformDexFile() const {
return is_platform_dex_;
ALWAYS_INLINE void SetIsPlatformDexFile() {
is_platform_dex_ = true;
bool IsInMainSection(const void* addr) const {
return Begin() <= addr && addr < Begin() + Size();
bool IsInDataSection(const void* addr) const {
return DataBegin() <= addr && addr < DataBegin() + DataSize();
DexFileContainer* GetContainer() const {
return container_.get();
// Changes the dex file pointed to by class_it to not have any hiddenapi flags.
static void UnHideAccessFlags(ClassDataItemIterator& class_it);
// First Dex format version supporting default methods.
static const uint32_t kDefaultMethodsVersion = 37;
DexFile(const uint8_t* base,
size_t size,
const uint8_t* data_begin,
size_t data_size,
const std::string& location,
uint32_t location_checksum,
const OatDexFile* oat_dex_file,
std::unique_ptr<DexFileContainer> container,
bool is_compact_dex);
// 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;
// Initialize section info for sections only found in map. Returns true on success.
void InitializeSectionsFromMapList();
// The base address of the memory mapping.
const uint8_t* const begin_;
// The size of the underlying memory allocation in bytes.
const size_t size_;
// The base address of the data section (same as Begin() for standard dex).
const uint8_t* const data_begin_;
// The size of the data section.
const size_t data_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_;
// 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_;
// Points to the base of the method handles list.
const MethodHandleItem* method_handles_;
// Number of elements in the method handles list.
size_t num_method_handles_;
// Points to the base of the call sites id list.
const CallSiteIdItem* call_site_ids_;
// Number of elements in the call sites list.
size_t num_call_site_ids_;
// If this dex file was loaded from an oat file, oat_dex_file_ contains a
// pointer to the OatDexFile it was loaded from. Otherwise oat_dex_file_ is
// null.
mutable const OatDexFile* oat_dex_file_;
// Manages the underlying memory allocation.
std::unique_ptr<DexFileContainer> container_;
// If the dex file is a compact dex file. If false then the dex file is a standard dex file.
const bool is_compact_dex_;
// If the dex file is located in /system/framework/.
bool is_platform_dex_;
friend class DexFileLoader;
friend class DexFileVerifierTest;
friend class OatWriter;
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) {
type_list_ = dex_file_.GetProtoParameters(proto_id);
if (type_list_ != nullptr) {
size_ = type_list_->Size();
bool HasNext() const { return pos_ < size_; }
size_t Size() const { return size_; }
void Next() { ++pos_; }
dex::TypeIndex GetTypeIdx() {
return type_list_->GetTypeItem(pos_).type_idx_;
const char* GetDescriptor() {
return dex_file_.StringByTypeIdx(dex::TypeIndex(GetTypeIdx()));
const DexFile& dex_file_;
const DexFile::TypeList* type_list_ = nullptr;
uint32_t size_ = 0;
uint32_t pos_ = 0;
// Abstract the signature of a method.
class Signature : public ValueObject {
std::string ToString() const;
static Signature NoSignature() {
return Signature();
bool IsVoid() const;
uint32_t GetNumberOfParameters() const;
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() = default;
friend class DexFile;
const DexFile* const dex_file_ = nullptr;
const DexFile::ProtoId* const proto_id_ = nullptr;
std::ostream& operator<<(std::ostream& os, const Signature& sig);
// Iterate and decode class_data_item
class ClassDataItemIterator {
ClassDataItemIterator(const DexFile& dex_file, const uint8_t* 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 IsAtMethod() const {
return pos_ >= EndOfInstanceFieldsPos();
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 HasNextMethod() const {
const bool result = pos_ >= EndOfInstanceFieldsPos() && pos_ < EndOfVirtualMethodsPos();
DCHECK_EQ(result, HasNextDirectMethod() || HasNextVirtualMethod());
return result;
void SkipStaticFields() {
while (HasNextStaticField()) {
void SkipInstanceFields() {
while (HasNextInstanceField()) {
void SkipAllFields() {
void SkipDirectMethods() {
while (HasNextDirectMethod()) {
void SkipVirtualMethods() {
while (HasNextVirtualMethod()) {
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 GetRawMemberAccessFlags() const {
if (pos_ < EndOfInstanceFieldsPos()) {
return field_.access_flags_;
} else {
DCHECK_LT(pos_, EndOfVirtualMethodsPos());
return method_.access_flags_;
uint32_t GetFieldAccessFlags() const {
return GetMemberAccessFlags() & kAccValidFieldFlags;
uint32_t GetMethodAccessFlags() const {
return GetMemberAccessFlags() & kAccValidMethodFlags;
uint32_t GetMemberAccessFlags() const {
return HiddenApiAccessFlags::RemoveFromDex(GetRawMemberAccessFlags());
HiddenApiAccessFlags::ApiList DecodeHiddenAccessFlags() const {
return HiddenApiAccessFlags::DecodeFromDex(GetRawMemberAccessFlags());
bool MemberIsNative() const {
return GetRawMemberAccessFlags() & kAccNative;
bool MemberIsFinal() const {
return GetRawMemberAccessFlags() & kAccFinal;
ALWAYS_INLINE InvokeType GetMethodInvokeType(const DexFile::ClassDef& class_def) const;
const DexFile::CodeItem* GetMethodCodeItem() const {
return dex_file_.GetCodeItem(method_.code_off_);
uint32_t GetMethodCodeItemOffset() const {
return method_.code_off_;
const uint8_t* DataPointer() const {
return ptr_pos_;
const uint8_t* 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 uint8_t* ptr_pos_; // pointer into stream of class_data_item
uint32_t last_idx_; // last read field or method index to apply delta to
class EncodedArrayValueIterator {
EncodedArrayValueIterator(const DexFile& dex_file, const uint8_t* array_data);
bool HasNext() const { return pos_ < array_size_; }
void Next();
enum ValueType {
kByte = 0x00,
kShort = 0x02,
kChar = 0x03,
kInt = 0x04,
kLong = 0x06,
kFloat = 0x10,
kDouble = 0x11,
kMethodType = 0x15,
kMethodHandle = 0x16,
kString = 0x17,
kType = 0x18,
kField = 0x19,
kMethod = 0x1a,
kEnum = 0x1b,
kArray = 0x1c,
kAnnotation = 0x1d,
kNull = 0x1e,
kBoolean = 0x1f,
ValueType GetValueType() const { return type_; }
const jvalue& GetJavaValue() const { return jval_; }
static constexpr uint8_t kEncodedValueTypeMask = 0x1f; // 0b11111
static constexpr uint8_t kEncodedValueArgShift = 5;
const DexFile& dex_file_;
size_t array_size_; // Size of array.
size_t pos_; // Current position.
const uint8_t* 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 EncodedArrayValueIterator::ValueType& code);
class EncodedStaticFieldValueIterator : public EncodedArrayValueIterator {
EncodedStaticFieldValueIterator(const DexFile& dex_file,
const DexFile::ClassDef& class_def)
: EncodedArrayValueIterator(dex_file,
std::ostream& operator<<(std::ostream& os, const EncodedStaticFieldValueIterator::ValueType& code);
class CallSiteArrayValueIterator : public EncodedArrayValueIterator {
CallSiteArrayValueIterator(const DexFile& dex_file,
const DexFile::CallSiteIdItem& call_site_id)
: EncodedArrayValueIterator(dex_file,
uint32_t Size() const { return array_size_; }
std::ostream& operator<<(std::ostream& os, const CallSiteArrayValueIterator::ValueType& code);
} // namespace art