runtime/dex_file-inl.h - LeafOS-Project/android_art - Gitiles

 /*
  * 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
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #ifndef ART_RUNTIME_DEX_FILE_INL_H_
 #define ART_RUNTIME_DEX_FILE_INL_H_

 #include "base/bit_utils.h"
 #include "base/casts.h"
 #include "base/stringpiece.h"
 #include "cdex/compact_dex_file.h"
 #include "dex_file.h"
 #include "invoke_type.h"
 #include "leb128.h"
 #include "standard_dex_file.h"

 namespace art {

 inline int32_t DexFile::GetStringLength(const StringId& string_id) const {
   const uint8_t* ptr = begin_ + string_id.string_data_off_;
   return DecodeUnsignedLeb128(&ptr);
 }

 inline const char* DexFile::GetStringDataAndUtf16Length(const StringId& string_id,
                                                         uint32_t* utf16_length) const {
   DCHECK(utf16_length != nullptr) << GetLocation();
   const uint8_t* ptr = begin_ + string_id.string_data_off_;
   *utf16_length = DecodeUnsignedLeb128(&ptr);
   return reinterpret_cast<const char*>(ptr);
 }

 inline const char* DexFile::GetStringData(const StringId& string_id) const {
   uint32_t ignored;
   return GetStringDataAndUtf16Length(string_id, &ignored);
 }

 inline const char* DexFile::StringDataAndUtf16LengthByIdx(dex::StringIndex idx,
                                                           uint32_t* utf16_length) const {
   if (!idx.IsValid()) {
     *utf16_length = 0;
     return nullptr;
   }
   const StringId& string_id = GetStringId(idx);
   return GetStringDataAndUtf16Length(string_id, utf16_length);
 }

 inline const char* DexFile::StringDataByIdx(dex::StringIndex idx) const {
   uint32_t unicode_length;
   return StringDataAndUtf16LengthByIdx(idx, &unicode_length);
 }

 inline const char* DexFile::StringByTypeIdx(dex::TypeIndex idx, uint32_t* unicode_length) const {
   if (!idx.IsValid()) {
     return nullptr;
   }
   const TypeId& type_id = GetTypeId(idx);
   return StringDataAndUtf16LengthByIdx(type_id.descriptor_idx_, unicode_length);
 }

 inline const char* DexFile::StringByTypeIdx(dex::TypeIndex idx) const {
   if (!idx.IsValid()) {
     return nullptr;
   }
   const TypeId& type_id = GetTypeId(idx);
   return StringDataByIdx(type_id.descriptor_idx_);
 }

 inline const char* DexFile::GetTypeDescriptor(const TypeId& type_id) const {
   return StringDataByIdx(type_id.descriptor_idx_);
 }

 inline const char* DexFile::GetFieldTypeDescriptor(const FieldId& field_id) const {
   const DexFile::TypeId& type_id = GetTypeId(field_id.type_idx_);
   return GetTypeDescriptor(type_id);
 }

 inline const char* DexFile::GetFieldName(const FieldId& field_id) const {
   return StringDataByIdx(field_id.name_idx_);
 }

 inline const char* DexFile::GetMethodDeclaringClassDescriptor(const MethodId& method_id) const {
   const DexFile::TypeId& type_id = GetTypeId(method_id.class_idx_);
   return GetTypeDescriptor(type_id);
 }

 inline const Signature DexFile::GetMethodSignature(const MethodId& method_id) const {
   return Signature(this, GetProtoId(method_id.proto_idx_));
 }

 inline const Signature DexFile::GetProtoSignature(const ProtoId& proto_id) const {
   return Signature(this, proto_id);
 }

 inline const char* DexFile::GetMethodName(const MethodId& method_id) const {
   return StringDataByIdx(method_id.name_idx_);
 }

 inline const char* DexFile::GetMethodShorty(uint32_t idx) const {
   return StringDataByIdx(GetProtoId(GetMethodId(idx).proto_idx_).shorty_idx_);
 }

 inline const char* DexFile::GetMethodShorty(const MethodId& method_id) const {
   return StringDataByIdx(GetProtoId(method_id.proto_idx_).shorty_idx_);
 }

 inline const char* DexFile::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);
 }

 inline const char* DexFile::GetClassDescriptor(const ClassDef& class_def) const {
   return StringByTypeIdx(class_def.class_idx_);
 }

 inline const char* DexFile::GetReturnTypeDescriptor(const ProtoId& proto_id) const {
   return StringByTypeIdx(proto_id.return_type_idx_);
 }

 inline const char* DexFile::GetShorty(uint32_t proto_idx) const {
   const ProtoId& proto_id = GetProtoId(proto_idx);
   return StringDataByIdx(proto_id.shorty_idx_);
 }

 inline const DexFile::TryItem* DexFile::GetTryItems(const CodeItem& code_item, uint32_t offset) {
   return GetTryItems(code_item.Instructions().end(), offset);
 }

 inline const DexFile::TryItem* DexFile::GetTryItems(const DexInstructionIterator& code_item_end,
                                                     uint32_t offset) {
   return reinterpret_cast<const TryItem*>
       (RoundUp(reinterpret_cast<uintptr_t>(&code_item_end.Inst()), 4)) + offset;
 }

 static inline bool DexFileStringEquals(const DexFile* df1, dex::StringIndex sidx1,
                                        const DexFile* df2, dex::StringIndex sidx2) {
   uint32_t s1_len;  // Note: utf16 length != mutf8 length.
   const char* s1_data = df1->StringDataAndUtf16LengthByIdx(sidx1, &s1_len);
   uint32_t s2_len;
   const char* s2_data = df2->StringDataAndUtf16LengthByIdx(sidx2, &s2_len);
   return (s1_len == s2_len) && (strcmp(s1_data, s2_data) == 0);
 }

 inline bool Signature::operator==(const Signature& rhs) const {
   if (dex_file_ == nullptr) {
     return rhs.dex_file_ == nullptr;
   }
   if (rhs.dex_file_ == nullptr) {
     return false;
   }
   if (dex_file_ == rhs.dex_file_) {
     return proto_id_ == rhs.proto_id_;
   }
   uint32_t lhs_shorty_len;  // For a shorty utf16 length == mutf8 length.
   const char* lhs_shorty_data = dex_file_->StringDataAndUtf16LengthByIdx(proto_id_->shorty_idx_,
                                                                          &lhs_shorty_len);
   StringPiece lhs_shorty(lhs_shorty_data, lhs_shorty_len);
   {
     uint32_t rhs_shorty_len;
     const char* rhs_shorty_data =
         rhs.dex_file_->StringDataAndUtf16LengthByIdx(rhs.proto_id_->shorty_idx_,
                                                      &rhs_shorty_len);
     StringPiece rhs_shorty(rhs_shorty_data, rhs_shorty_len);
     if (lhs_shorty != rhs_shorty) {
       return false;  // Shorty mismatch.
     }
   }
   if (lhs_shorty[0] == 'L') {
     const DexFile::TypeId& return_type_id = dex_file_->GetTypeId(proto_id_->return_type_idx_);
     const DexFile::TypeId& rhs_return_type_id =
         rhs.dex_file_->GetTypeId(rhs.proto_id_->return_type_idx_);
     if (!DexFileStringEquals(dex_file_, return_type_id.descriptor_idx_,
                              rhs.dex_file_, rhs_return_type_id.descriptor_idx_)) {
       return false;  // Return type mismatch.
     }
   }
   if (lhs_shorty.find('L', 1) != StringPiece::npos) {
     const DexFile::TypeList* params = dex_file_->GetProtoParameters(*proto_id_);
     const DexFile::TypeList* rhs_params = rhs.dex_file_->GetProtoParameters(*rhs.proto_id_);
     // We found a reference parameter in the matching shorty, so both lists must be non-empty.
     DCHECK(params != nullptr);
     DCHECK(rhs_params != nullptr);
     uint32_t params_size = params->Size();
     DCHECK_EQ(params_size, rhs_params->Size());  // Parameter list size must match.
     for (uint32_t i = 0; i < params_size; ++i) {
       const DexFile::TypeId& param_id = dex_file_->GetTypeId(params->GetTypeItem(i).type_idx_);
       const DexFile::TypeId& rhs_param_id =
           rhs.dex_file_->GetTypeId(rhs_params->GetTypeItem(i).type_idx_);
       if (!DexFileStringEquals(dex_file_, param_id.descriptor_idx_,
                                rhs.dex_file_, rhs_param_id.descriptor_idx_)) {
         return false;  // Parameter type mismatch.
       }
     }
   }
   return true;
 }

 inline
 InvokeType ClassDataItemIterator::GetMethodInvokeType(const DexFile::ClassDef& class_def) const {
   if (HasNextDirectMethod()) {
     if ((GetRawMemberAccessFlags() & kAccStatic) != 0) {
       return kStatic;
     } else {
       return kDirect;
     }
   } else {
     DCHECK_EQ(GetRawMemberAccessFlags() & kAccStatic, 0U);
     if ((class_def.access_flags_ & kAccInterface) != 0) {
       return kInterface;
     } else if ((GetRawMemberAccessFlags() & kAccConstructor) != 0) {
       return kSuper;
     } else {
       return kVirtual;
     }
   }
 }

 template<typename NewLocalCallback, typename IndexToStringData, typename TypeIndexToStringData>
 bool DexFile::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_callback,
                                    void* context) {
   if (stream == nullptr) {
     return false;
   }
   std::vector<LocalInfo> local_in_reg(registers_size);

   uint16_t arg_reg = registers_size - ins_size;
   if (!is_static) {
     const char* descriptor = declaring_class_descriptor;
     local_in_reg[arg_reg].name_ = "this";
     local_in_reg[arg_reg].descriptor_ = descriptor;
     local_in_reg[arg_reg].signature_ = nullptr;
     local_in_reg[arg_reg].start_address_ = 0;
     local_in_reg[arg_reg].reg_ = arg_reg;
     local_in_reg[arg_reg].is_live_ = true;
     arg_reg++;
   }

   DecodeUnsignedLeb128(&stream);  // Line.
   uint32_t parameters_size = DecodeUnsignedLeb128(&stream);
   uint32_t i;
   if (parameters_size != arg_descriptors.size()) {
     LOG(ERROR) << "invalid stream - problem with parameter iterator in " << location
                << " for method " << method_name;
     return false;
   }
   for (i = 0; i < parameters_size && i < arg_descriptors.size(); ++i) {
     if (arg_reg >= registers_size) {
       LOG(ERROR) << "invalid stream - arg reg >= reg size (" << arg_reg
                  << " >= " << registers_size << ") in " << location;
       return false;
     }
     uint32_t name_idx = DecodeUnsignedLeb128P1(&stream);
     const char* descriptor = arg_descriptors[i];
     local_in_reg[arg_reg].name_ = index_to_string_data(name_idx);
     local_in_reg[arg_reg].descriptor_ = descriptor;
     local_in_reg[arg_reg].signature_ = nullptr;
     local_in_reg[arg_reg].start_address_ = 0;
     local_in_reg[arg_reg].reg_ = arg_reg;
     local_in_reg[arg_reg].is_live_ = true;
     switch (*descriptor) {
       case 'D':
       case 'J':
         arg_reg += 2;
         break;
       default:
         arg_reg += 1;
         break;
     }
   }

   uint32_t address = 0;
   for (;;)  {
     uint8_t opcode = *stream++;
     switch (opcode) {
       case DBG_END_SEQUENCE:
         // Emit all variables which are still alive at the end of the method.
         for (uint16_t reg = 0; reg < registers_size; reg++) {
           if (local_in_reg[reg].is_live_) {
             local_in_reg[reg].end_address_ = insns_size_in_code_units;
             new_local_callback(context, local_in_reg[reg]);
           }
         }
         return true;
       case DBG_ADVANCE_PC:
         address += DecodeUnsignedLeb128(&stream);
         break;
       case DBG_ADVANCE_LINE:
         DecodeSignedLeb128(&stream);  // Line.
         break;
       case DBG_START_LOCAL:
       case DBG_START_LOCAL_EXTENDED: {
         uint16_t reg = DecodeUnsignedLeb128(&stream);
         if (reg >= registers_size) {
           LOG(ERROR) << "invalid stream - reg >= reg size (" << reg << " >= "
                      << registers_size << ") in " << location;
           return false;
         }

         uint32_t name_idx = DecodeUnsignedLeb128P1(&stream);
         uint16_t descriptor_idx = DecodeUnsignedLeb128P1(&stream);
         uint32_t signature_idx = dex::kDexNoIndex;
         if (opcode == DBG_START_LOCAL_EXTENDED) {
           signature_idx = DecodeUnsignedLeb128P1(&stream);
         }

         // Emit what was previously there, if anything
         if (local_in_reg[reg].is_live_) {
           local_in_reg[reg].end_address_ = address;
           new_local_callback(context, local_in_reg[reg]);
         }

         local_in_reg[reg].name_ = index_to_string_data(name_idx);
         local_in_reg[reg].descriptor_ = type_index_to_string_data(descriptor_idx);;
         local_in_reg[reg].signature_ = index_to_string_data(signature_idx);
         local_in_reg[reg].start_address_ = address;
         local_in_reg[reg].reg_ = reg;
         local_in_reg[reg].is_live_ = true;
         break;
       }
       case DBG_END_LOCAL: {
         uint16_t reg = DecodeUnsignedLeb128(&stream);
         if (reg >= registers_size) {
           LOG(ERROR) << "invalid stream - reg >= reg size (" << reg << " >= "
                      << registers_size << ") in " << location;
           return false;
         }
         // If the register is live, close it properly. Otherwise, closing an already
         // closed register is sloppy, but harmless if no further action is taken.
         if (local_in_reg[reg].is_live_) {
           local_in_reg[reg].end_address_ = address;
           new_local_callback(context, local_in_reg[reg]);
           local_in_reg[reg].is_live_ = false;
         }
         break;
       }
       case DBG_RESTART_LOCAL: {
         uint16_t reg = DecodeUnsignedLeb128(&stream);
         if (reg >= registers_size) {
           LOG(ERROR) << "invalid stream - reg >= reg size (" << reg << " >= "
                      << registers_size << ") in " << location;
           return false;
         }
         // If the register is live, the "restart" is superfluous,
         // and we don't want to mess with the existing start address.
         if (!local_in_reg[reg].is_live_) {
           local_in_reg[reg].start_address_ = address;
           local_in_reg[reg].is_live_ = true;
         }
         break;
       }
       case DBG_SET_PROLOGUE_END:
       case DBG_SET_EPILOGUE_BEGIN:
         break;
       case DBG_SET_FILE:
         DecodeUnsignedLeb128P1(&stream);  // name.
         break;
       default:
         address += (opcode - DBG_FIRST_SPECIAL) / DBG_LINE_RANGE;
         break;
     }
   }
 }

 template<typename NewLocalCallback>
 bool DexFile::DecodeDebugLocalInfo(const CodeItem* code_item,
                                    uint32_t debug_info_offset,
                                    bool is_static,
                                    uint32_t method_idx,
                                    NewLocalCallback new_local_callback,
                                    void* context) const {
   if (code_item == nullptr) {
     return false;
   }
   std::vector<const char*> arg_descriptors;
   DexFileParameterIterator it(*this, GetMethodPrototype(GetMethodId(method_idx)));
   for (; it.HasNext(); it.Next()) {
     arg_descriptors.push_back(it.GetDescriptor());
   }
   return DecodeDebugLocalInfo(GetDebugInfoStream(debug_info_offset),
                               GetLocation(),
                               GetMethodDeclaringClassDescriptor(GetMethodId(method_idx)),
                               arg_descriptors,
                               this->PrettyMethod(method_idx),
                               is_static,
                               code_item->registers_size_,
                               code_item->ins_size_,
                               code_item->insns_size_in_code_units_,
                               [this](uint32_t idx) {
                                 return StringDataByIdx(dex::StringIndex(idx));
                               },
                               [this](uint32_t idx) {
                                 return StringByTypeIdx(dex::TypeIndex(
                                     dchecked_integral_cast<uint16_t>(idx)));
                               },
                               new_local_callback,
                               context);
 }

 template<typename DexDebugNewPosition, typename IndexToStringData>
 bool DexFile::DecodeDebugPositionInfo(const uint8_t* stream,
                                       IndexToStringData index_to_string_data,
                                       DexDebugNewPosition position_functor,
                                       void* context) {
   if (stream == nullptr) {
     return false;
   }

   PositionInfo entry = PositionInfo();
   entry.line_ = DecodeUnsignedLeb128(&stream);
   uint32_t parameters_size = DecodeUnsignedLeb128(&stream);
   for (uint32_t i = 0; i < parameters_size; ++i) {
     DecodeUnsignedLeb128P1(&stream);  // Parameter name.
   }

   for (;;)  {
     uint8_t opcode = *stream++;
     switch (opcode) {
       case DBG_END_SEQUENCE:
         return true;  // end of stream.
       case DBG_ADVANCE_PC:
         entry.address_ += DecodeUnsignedLeb128(&stream);
         break;
       case DBG_ADVANCE_LINE:
         entry.line_ += DecodeSignedLeb128(&stream);
         break;
       case DBG_START_LOCAL:
         DecodeUnsignedLeb128(&stream);  // reg.
         DecodeUnsignedLeb128P1(&stream);  // name.
         DecodeUnsignedLeb128P1(&stream);  // descriptor.
         break;
       case DBG_START_LOCAL_EXTENDED:
         DecodeUnsignedLeb128(&stream);  // reg.
         DecodeUnsignedLeb128P1(&stream);  // name.
         DecodeUnsignedLeb128P1(&stream);  // descriptor.
         DecodeUnsignedLeb128P1(&stream);  // signature.
         break;
       case DBG_END_LOCAL:
       case DBG_RESTART_LOCAL:
         DecodeUnsignedLeb128(&stream);  // reg.
         break;
       case DBG_SET_PROLOGUE_END:
         entry.prologue_end_ = true;
         break;
       case DBG_SET_EPILOGUE_BEGIN:
         entry.epilogue_begin_ = true;
         break;
       case DBG_SET_FILE: {
         uint32_t name_idx = DecodeUnsignedLeb128P1(&stream);
         entry.source_file_ = index_to_string_data(name_idx);
         break;
       }
       default: {
         int adjopcode = opcode - DBG_FIRST_SPECIAL;
         entry.address_ += adjopcode / DBG_LINE_RANGE;
         entry.line_ += DBG_LINE_BASE + (adjopcode % DBG_LINE_RANGE);
         if (position_functor(context, entry)) {
           return true;  // early exit.
         }
         entry.prologue_end_ = false;
         entry.epilogue_begin_ = false;
         break;
       }
     }
   }
 }

 template<typename DexDebugNewPosition>
 bool DexFile::DecodeDebugPositionInfo(const CodeItem* code_item,
                                       uint32_t debug_info_offset,
                                       DexDebugNewPosition position_functor,
                                       void* context) const {
   if (code_item == nullptr) {
     return false;
   }
   return DecodeDebugPositionInfo(GetDebugInfoStream(debug_info_offset),
                                  [this](uint32_t idx) {
                                    return StringDataByIdx(dex::StringIndex(idx));
                                  },
                                  position_functor,
                                  context);
 }

 inline const CompactDexFile* DexFile::AsCompactDexFile() const {
   DCHECK(IsCompactDexFile());
   return down_cast<const CompactDexFile*>(this);
 }

 inline const StandardDexFile* DexFile::AsStandardDexFile() const {
   DCHECK(IsStandardDexFile());
   return down_cast<const StandardDexFile*>(this);
 }

 }  // namespace art

 #endif  // ART_RUNTIME_DEX_FILE_INL_H_
	/*
	* 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
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#ifndef ART_RUNTIME_DEX_FILE_INL_H_
	#define ART_RUNTIME_DEX_FILE_INL_H_

	#include "base/bit_utils.h"
	#include "base/casts.h"
	#include "base/stringpiece.h"
	#include "cdex/compact_dex_file.h"
	#include "dex_file.h"
	#include "invoke_type.h"
	#include "leb128.h"
	#include "standard_dex_file.h"

	namespace art {

	inline int32_t DexFile::GetStringLength(const StringId& string_id) const {
	const uint8_t* ptr = begin_ + string_id.string_data_off_;
	return DecodeUnsignedLeb128(&ptr);
	}

	inline const char* DexFile::GetStringDataAndUtf16Length(const StringId& string_id,
	uint32_t* utf16_length) const {
	DCHECK(utf16_length != nullptr) << GetLocation();
	const uint8_t* ptr = begin_ + string_id.string_data_off_;
	*utf16_length = DecodeUnsignedLeb128(&ptr);
	return reinterpret_cast<const char*>(ptr);
	}

	inline const char* DexFile::GetStringData(const StringId& string_id) const {
	uint32_t ignored;
	return GetStringDataAndUtf16Length(string_id, &ignored);
	}

	inline const char* DexFile::StringDataAndUtf16LengthByIdx(dex::StringIndex idx,
	uint32_t* utf16_length) const {
	if (!idx.IsValid()) {
	*utf16_length = 0;
	return nullptr;
	}
	const StringId& string_id = GetStringId(idx);
	return GetStringDataAndUtf16Length(string_id, utf16_length);
	}

	inline const char* DexFile::StringDataByIdx(dex::StringIndex idx) const {
	uint32_t unicode_length;
	return StringDataAndUtf16LengthByIdx(idx, &unicode_length);
	}

	inline const char* DexFile::StringByTypeIdx(dex::TypeIndex idx, uint32_t* unicode_length) const {
	if (!idx.IsValid()) {
	return nullptr;
	}
	const TypeId& type_id = GetTypeId(idx);
	return StringDataAndUtf16LengthByIdx(type_id.descriptor_idx_, unicode_length);
	}

	inline const char* DexFile::StringByTypeIdx(dex::TypeIndex idx) const {
	if (!idx.IsValid()) {
	return nullptr;
	}
	const TypeId& type_id = GetTypeId(idx);
	return StringDataByIdx(type_id.descriptor_idx_);
	}

	inline const char* DexFile::GetTypeDescriptor(const TypeId& type_id) const {
	return StringDataByIdx(type_id.descriptor_idx_);
	}

	inline const char* DexFile::GetFieldTypeDescriptor(const FieldId& field_id) const {
	const DexFile::TypeId& type_id = GetTypeId(field_id.type_idx_);
	return GetTypeDescriptor(type_id);
	}

	inline const char* DexFile::GetFieldName(const FieldId& field_id) const {
	return StringDataByIdx(field_id.name_idx_);
	}

	inline const char* DexFile::GetMethodDeclaringClassDescriptor(const MethodId& method_id) const {
	const DexFile::TypeId& type_id = GetTypeId(method_id.class_idx_);
	return GetTypeDescriptor(type_id);
	}

	inline const Signature DexFile::GetMethodSignature(const MethodId& method_id) const {
	return Signature(this, GetProtoId(method_id.proto_idx_));
	}

	inline const Signature DexFile::GetProtoSignature(const ProtoId& proto_id) const {
	return Signature(this, proto_id);
	}

	inline const char* DexFile::GetMethodName(const MethodId& method_id) const {
	return StringDataByIdx(method_id.name_idx_);
	}

	inline const char* DexFile::GetMethodShorty(uint32_t idx) const {
	return StringDataByIdx(GetProtoId(GetMethodId(idx).proto_idx_).shorty_idx_);
	}

	inline const char* DexFile::GetMethodShorty(const MethodId& method_id) const {
	return StringDataByIdx(GetProtoId(method_id.proto_idx_).shorty_idx_);
	}

	inline const char* DexFile::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);
	}

	inline const char* DexFile::GetClassDescriptor(const ClassDef& class_def) const {
	return StringByTypeIdx(class_def.class_idx_);
	}

	inline const char* DexFile::GetReturnTypeDescriptor(const ProtoId& proto_id) const {
	return StringByTypeIdx(proto_id.return_type_idx_);
	}

	inline const char* DexFile::GetShorty(uint32_t proto_idx) const {
	const ProtoId& proto_id = GetProtoId(proto_idx);
	return StringDataByIdx(proto_id.shorty_idx_);
	}

	inline const DexFile::TryItem* DexFile::GetTryItems(const CodeItem& code_item, uint32_t offset) {
	return GetTryItems(code_item.Instructions().end(), offset);
	}

	inline const DexFile::TryItem* DexFile::GetTryItems(const DexInstructionIterator& code_item_end,
	uint32_t offset) {
	return reinterpret_cast<const TryItem*>
	(RoundUp(reinterpret_cast<uintptr_t>(&code_item_end.Inst()), 4)) + offset;
	}

	static inline bool DexFileStringEquals(const DexFile* df1, dex::StringIndex sidx1,
	const DexFile* df2, dex::StringIndex sidx2) {
	uint32_t s1_len; // Note: utf16 length != mutf8 length.
	const char* s1_data = df1->StringDataAndUtf16LengthByIdx(sidx1, &s1_len);
	uint32_t s2_len;
	const char* s2_data = df2->StringDataAndUtf16LengthByIdx(sidx2, &s2_len);
	return (s1_len == s2_len) && (strcmp(s1_data, s2_data) == 0);
	}

	inline bool Signature::operator==(const Signature& rhs) const {
	if (dex_file_ == nullptr) {
	return rhs.dex_file_ == nullptr;
	}
	if (rhs.dex_file_ == nullptr) {
	return false;
	}
	if (dex_file_ == rhs.dex_file_) {
	return proto_id_ == rhs.proto_id_;
	}
	uint32_t lhs_shorty_len; // For a shorty utf16 length == mutf8 length.
	const char* lhs_shorty_data = dex_file_->StringDataAndUtf16LengthByIdx(proto_id_->shorty_idx_,
	&lhs_shorty_len);
	StringPiece lhs_shorty(lhs_shorty_data, lhs_shorty_len);
	{
	uint32_t rhs_shorty_len;
	const char* rhs_shorty_data =
	rhs.dex_file_->StringDataAndUtf16LengthByIdx(rhs.proto_id_->shorty_idx_,
	&rhs_shorty_len);
	StringPiece rhs_shorty(rhs_shorty_data, rhs_shorty_len);
	if (lhs_shorty != rhs_shorty) {
	return false; // Shorty mismatch.
	}
	}
	if (lhs_shorty[0] == 'L') {
	const DexFile::TypeId& return_type_id = dex_file_->GetTypeId(proto_id_->return_type_idx_);
	const DexFile::TypeId& rhs_return_type_id =
	rhs.dex_file_->GetTypeId(rhs.proto_id_->return_type_idx_);
	if (!DexFileStringEquals(dex_file_, return_type_id.descriptor_idx_,
	rhs.dex_file_, rhs_return_type_id.descriptor_idx_)) {
	return false; // Return type mismatch.
	}
	}
	if (lhs_shorty.find('L', 1) != StringPiece::npos) {
	const DexFile::TypeList* params = dex_file_->GetProtoParameters(*proto_id_);
	const DexFile::TypeList* rhs_params = rhs.dex_file_->GetProtoParameters(*rhs.proto_id_);
	// We found a reference parameter in the matching shorty, so both lists must be non-empty.
	DCHECK(params != nullptr);
	DCHECK(rhs_params != nullptr);
	uint32_t params_size = params->Size();
	DCHECK_EQ(params_size, rhs_params->Size()); // Parameter list size must match.
	for (uint32_t i = 0; i < params_size; ++i) {
	const DexFile::TypeId& param_id = dex_file_->GetTypeId(params->GetTypeItem(i).type_idx_);
	const DexFile::TypeId& rhs_param_id =
	rhs.dex_file_->GetTypeId(rhs_params->GetTypeItem(i).type_idx_);
	if (!DexFileStringEquals(dex_file_, param_id.descriptor_idx_,
	rhs.dex_file_, rhs_param_id.descriptor_idx_)) {
	return false; // Parameter type mismatch.
	}
	}
	}
	return true;
	}

	inline
	InvokeType ClassDataItemIterator::GetMethodInvokeType(const DexFile::ClassDef& class_def) const {
	if (HasNextDirectMethod()) {
	if ((GetRawMemberAccessFlags() & kAccStatic) != 0) {
	return kStatic;
	} else {
	return kDirect;
	}
	} else {
	DCHECK_EQ(GetRawMemberAccessFlags() & kAccStatic, 0U);
	if ((class_def.access_flags_ & kAccInterface) != 0) {
	return kInterface;
	} else if ((GetRawMemberAccessFlags() & kAccConstructor) != 0) {
	return kSuper;
	} else {
	return kVirtual;
	}
	}
	}

	template<typename NewLocalCallback, typename IndexToStringData, typename TypeIndexToStringData>
	bool DexFile::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_callback,
	void* context) {
	if (stream == nullptr) {
	return false;
	}
	std::vector<LocalInfo> local_in_reg(registers_size);

	uint16_t arg_reg = registers_size - ins_size;
	if (!is_static) {
	const char* descriptor = declaring_class_descriptor;
	local_in_reg[arg_reg].name_ = "this";
	local_in_reg[arg_reg].descriptor_ = descriptor;
	local_in_reg[arg_reg].signature_ = nullptr;
	local_in_reg[arg_reg].start_address_ = 0;
	local_in_reg[arg_reg].reg_ = arg_reg;
	local_in_reg[arg_reg].is_live_ = true;
	arg_reg++;
	}

	DecodeUnsignedLeb128(&stream); // Line.
	uint32_t parameters_size = DecodeUnsignedLeb128(&stream);
	uint32_t i;
	if (parameters_size != arg_descriptors.size()) {
	LOG(ERROR) << "invalid stream - problem with parameter iterator in " << location
	<< " for method " << method_name;
	return false;
	}
	for (i = 0; i < parameters_size && i < arg_descriptors.size(); ++i) {
	if (arg_reg >= registers_size) {
	LOG(ERROR) << "invalid stream - arg reg >= reg size (" << arg_reg
	<< " >= " << registers_size << ") in " << location;
	return false;
	}
	uint32_t name_idx = DecodeUnsignedLeb128P1(&stream);
	const char* descriptor = arg_descriptors[i];
	local_in_reg[arg_reg].name_ = index_to_string_data(name_idx);
	local_in_reg[arg_reg].descriptor_ = descriptor;
	local_in_reg[arg_reg].signature_ = nullptr;
	local_in_reg[arg_reg].start_address_ = 0;
	local_in_reg[arg_reg].reg_ = arg_reg;
	local_in_reg[arg_reg].is_live_ = true;
	switch (*descriptor) {
	case 'D':
	case 'J':
	arg_reg += 2;
	break;
	default:
	arg_reg += 1;
	break;
	}
	}

	uint32_t address = 0;
	for (;;) {
	uint8_t opcode = *stream++;
	switch (opcode) {
	case DBG_END_SEQUENCE:
	// Emit all variables which are still alive at the end of the method.
	for (uint16_t reg = 0; reg < registers_size; reg++) {
	if (local_in_reg[reg].is_live_) {
	local_in_reg[reg].end_address_ = insns_size_in_code_units;
	new_local_callback(context, local_in_reg[reg]);
	}
	}
	return true;
	case DBG_ADVANCE_PC:
	address += DecodeUnsignedLeb128(&stream);
	break;
	case DBG_ADVANCE_LINE:
	DecodeSignedLeb128(&stream); // Line.
	break;
	case DBG_START_LOCAL:
	case DBG_START_LOCAL_EXTENDED: {
	uint16_t reg = DecodeUnsignedLeb128(&stream);
	if (reg >= registers_size) {
	LOG(ERROR) << "invalid stream - reg >= reg size (" << reg << " >= "
	<< registers_size << ") in " << location;
	return false;
	}

	uint32_t name_idx = DecodeUnsignedLeb128P1(&stream);
	uint16_t descriptor_idx = DecodeUnsignedLeb128P1(&stream);
	uint32_t signature_idx = dex::kDexNoIndex;
	if (opcode == DBG_START_LOCAL_EXTENDED) {
	signature_idx = DecodeUnsignedLeb128P1(&stream);
	}

	// Emit what was previously there, if anything
	if (local_in_reg[reg].is_live_) {
	local_in_reg[reg].end_address_ = address;
	new_local_callback(context, local_in_reg[reg]);
	}

	local_in_reg[reg].name_ = index_to_string_data(name_idx);
	local_in_reg[reg].descriptor_ = type_index_to_string_data(descriptor_idx);;
	local_in_reg[reg].signature_ = index_to_string_data(signature_idx);
	local_in_reg[reg].start_address_ = address;
	local_in_reg[reg].reg_ = reg;
	local_in_reg[reg].is_live_ = true;
	break;
	}
	case DBG_END_LOCAL: {
	uint16_t reg = DecodeUnsignedLeb128(&stream);
	if (reg >= registers_size) {
	LOG(ERROR) << "invalid stream - reg >= reg size (" << reg << " >= "
	<< registers_size << ") in " << location;
	return false;
	}
	// If the register is live, close it properly. Otherwise, closing an already
	// closed register is sloppy, but harmless if no further action is taken.
	if (local_in_reg[reg].is_live_) {
	local_in_reg[reg].end_address_ = address;
	new_local_callback(context, local_in_reg[reg]);
	local_in_reg[reg].is_live_ = false;
	}
	break;
	}
	case DBG_RESTART_LOCAL: {
	uint16_t reg = DecodeUnsignedLeb128(&stream);
	if (reg >= registers_size) {
	LOG(ERROR) << "invalid stream - reg >= reg size (" << reg << " >= "
	<< registers_size << ") in " << location;
	return false;
	}
	// If the register is live, the "restart" is superfluous,
	// and we don't want to mess with the existing start address.
	if (!local_in_reg[reg].is_live_) {
	local_in_reg[reg].start_address_ = address;
	local_in_reg[reg].is_live_ = true;
	}
	break;
	}
	case DBG_SET_PROLOGUE_END:
	case DBG_SET_EPILOGUE_BEGIN:
	break;
	case DBG_SET_FILE:
	DecodeUnsignedLeb128P1(&stream); // name.
	break;
	default:
	address += (opcode - DBG_FIRST_SPECIAL) / DBG_LINE_RANGE;
	break;
	}
	}
	}

	template<typename NewLocalCallback>
	bool DexFile::DecodeDebugLocalInfo(const CodeItem* code_item,
	uint32_t debug_info_offset,
	bool is_static,
	uint32_t method_idx,
	NewLocalCallback new_local_callback,
	void* context) const {
	if (code_item == nullptr) {
	return false;
	}
	std::vector<const char*> arg_descriptors;
	DexFileParameterIterator it(*this, GetMethodPrototype(GetMethodId(method_idx)));
	for (; it.HasNext(); it.Next()) {
	arg_descriptors.push_back(it.GetDescriptor());
	}
	return DecodeDebugLocalInfo(GetDebugInfoStream(debug_info_offset),
	GetLocation(),
	GetMethodDeclaringClassDescriptor(GetMethodId(method_idx)),
	arg_descriptors,
	this->PrettyMethod(method_idx),
	is_static,
	code_item->registers_size_,
	code_item->ins_size_,
	code_item->insns_size_in_code_units_,
	[this](uint32_t idx) {
	return StringDataByIdx(dex::StringIndex(idx));
	},
	[this](uint32_t idx) {
	return StringByTypeIdx(dex::TypeIndex(
	dchecked_integral_cast<uint16_t>(idx)));
	},
	new_local_callback,
	context);
	}

	template<typename DexDebugNewPosition, typename IndexToStringData>
	bool DexFile::DecodeDebugPositionInfo(const uint8_t* stream,
	IndexToStringData index_to_string_data,
	DexDebugNewPosition position_functor,
	void* context) {
	if (stream == nullptr) {
	return false;
	}

	PositionInfo entry = PositionInfo();
	entry.line_ = DecodeUnsignedLeb128(&stream);
	uint32_t parameters_size = DecodeUnsignedLeb128(&stream);
	for (uint32_t i = 0; i < parameters_size; ++i) {
	DecodeUnsignedLeb128P1(&stream); // Parameter name.
	}

	for (;;) {
	uint8_t opcode = *stream++;
	switch (opcode) {
	case DBG_END_SEQUENCE:
	return true; // end of stream.
	case DBG_ADVANCE_PC:
	entry.address_ += DecodeUnsignedLeb128(&stream);
	break;
	case DBG_ADVANCE_LINE:
	entry.line_ += DecodeSignedLeb128(&stream);
	break;
	case DBG_START_LOCAL:
	DecodeUnsignedLeb128(&stream); // reg.
	DecodeUnsignedLeb128P1(&stream); // name.
	DecodeUnsignedLeb128P1(&stream); // descriptor.
	break;
	case DBG_START_LOCAL_EXTENDED:
	DecodeUnsignedLeb128(&stream); // reg.
	DecodeUnsignedLeb128P1(&stream); // name.
	DecodeUnsignedLeb128P1(&stream); // descriptor.
	DecodeUnsignedLeb128P1(&stream); // signature.
	break;
	case DBG_END_LOCAL:
	case DBG_RESTART_LOCAL:
	DecodeUnsignedLeb128(&stream); // reg.
	break;
	case DBG_SET_PROLOGUE_END:
	entry.prologue_end_ = true;
	break;
	case DBG_SET_EPILOGUE_BEGIN:
	entry.epilogue_begin_ = true;
	break;
	case DBG_SET_FILE: {
	uint32_t name_idx = DecodeUnsignedLeb128P1(&stream);
	entry.source_file_ = index_to_string_data(name_idx);
	break;
	}
	default: {
	int adjopcode = opcode - DBG_FIRST_SPECIAL;
	entry.address_ += adjopcode / DBG_LINE_RANGE;
	entry.line_ += DBG_LINE_BASE + (adjopcode % DBG_LINE_RANGE);
	if (position_functor(context, entry)) {
	return true; // early exit.
	}
	entry.prologue_end_ = false;
	entry.epilogue_begin_ = false;
	break;
	}
	}
	}
	}

	template<typename DexDebugNewPosition>
	bool DexFile::DecodeDebugPositionInfo(const CodeItem* code_item,
	uint32_t debug_info_offset,
	DexDebugNewPosition position_functor,
	void* context) const {
	if (code_item == nullptr) {
	return false;
	}
	return DecodeDebugPositionInfo(GetDebugInfoStream(debug_info_offset),
	[this](uint32_t idx) {
	return StringDataByIdx(dex::StringIndex(idx));
	},
	position_functor,
	context);
	}

	inline const CompactDexFile* DexFile::AsCompactDexFile() const {
	DCHECK(IsCompactDexFile());
	return down_cast<const CompactDexFile*>(this);
	}

	inline const StandardDexFile* DexFile::AsStandardDexFile() const {
	DCHECK(IsStandardDexFile());
	return down_cast<const StandardDexFile*>(this);
	}

	} // namespace art

	#endif // ART_RUNTIME_DEX_FILE_INL_H_