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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ART_RUNTIME_DEX_FILE_INL_H_
     18 #define ART_RUNTIME_DEX_FILE_INL_H_
     19 
     20 #include "base/bit_utils.h"
     21 #include "base/logging.h"
     22 #include "base/stringpiece.h"
     23 #include "dex_file.h"
     24 #include "leb128.h"
     25 
     26 namespace art {
     27 
     28 inline int32_t DexFile::GetStringLength(const StringId& string_id) const {
     29   const uint8_t* ptr = begin_ + string_id.string_data_off_;
     30   return DecodeUnsignedLeb128(&ptr);
     31 }
     32 
     33 inline const char* DexFile::GetStringDataAndUtf16Length(const StringId& string_id,
     34                                                         uint32_t* utf16_length) const {
     35   DCHECK(utf16_length != nullptr) << GetLocation();
     36   const uint8_t* ptr = begin_ + string_id.string_data_off_;
     37   *utf16_length = DecodeUnsignedLeb128(&ptr);
     38   return reinterpret_cast<const char*>(ptr);
     39 }
     40 
     41 inline const Signature DexFile::GetMethodSignature(const MethodId& method_id) const {
     42   return Signature(this, GetProtoId(method_id.proto_idx_));
     43 }
     44 
     45 inline const DexFile::TryItem* DexFile::GetTryItems(const CodeItem& code_item, uint32_t offset) {
     46   const uint16_t* insns_end_ = &code_item.insns_[code_item.insns_size_in_code_units_];
     47   return reinterpret_cast<const TryItem*>
     48       (RoundUp(reinterpret_cast<uintptr_t>(insns_end_), 4)) + offset;
     49 }
     50 
     51 static inline bool DexFileStringEquals(const DexFile* df1, uint32_t sidx1,
     52                                        const DexFile* df2, uint32_t sidx2) {
     53   uint32_t s1_len;  // Note: utf16 length != mutf8 length.
     54   const char* s1_data = df1->StringDataAndUtf16LengthByIdx(sidx1, &s1_len);
     55   uint32_t s2_len;
     56   const char* s2_data = df2->StringDataAndUtf16LengthByIdx(sidx2, &s2_len);
     57   return (s1_len == s2_len) && (strcmp(s1_data, s2_data) == 0);
     58 }
     59 
     60 inline bool Signature::operator==(const Signature& rhs) const {
     61   if (dex_file_ == nullptr) {
     62     return rhs.dex_file_ == nullptr;
     63   }
     64   if (rhs.dex_file_ == nullptr) {
     65     return false;
     66   }
     67   if (dex_file_ == rhs.dex_file_) {
     68     return proto_id_ == rhs.proto_id_;
     69   }
     70   uint32_t lhs_shorty_len;  // For a shorty utf16 length == mutf8 length.
     71   const char* lhs_shorty_data = dex_file_->StringDataAndUtf16LengthByIdx(proto_id_->shorty_idx_,
     72                                                                          &lhs_shorty_len);
     73   StringPiece lhs_shorty(lhs_shorty_data, lhs_shorty_len);
     74   {
     75     uint32_t rhs_shorty_len;
     76     const char* rhs_shorty_data =
     77         rhs.dex_file_->StringDataAndUtf16LengthByIdx(rhs.proto_id_->shorty_idx_,
     78                                                      &rhs_shorty_len);
     79     StringPiece rhs_shorty(rhs_shorty_data, rhs_shorty_len);
     80     if (lhs_shorty != rhs_shorty) {
     81       return false;  // Shorty mismatch.
     82     }
     83   }
     84   if (lhs_shorty[0] == 'L') {
     85     const DexFile::TypeId& return_type_id = dex_file_->GetTypeId(proto_id_->return_type_idx_);
     86     const DexFile::TypeId& rhs_return_type_id =
     87         rhs.dex_file_->GetTypeId(rhs.proto_id_->return_type_idx_);
     88     if (!DexFileStringEquals(dex_file_, return_type_id.descriptor_idx_,
     89                              rhs.dex_file_, rhs_return_type_id.descriptor_idx_)) {
     90       return false;  // Return type mismatch.
     91     }
     92   }
     93   if (lhs_shorty.find('L', 1) != StringPiece::npos) {
     94     const DexFile::TypeList* params = dex_file_->GetProtoParameters(*proto_id_);
     95     const DexFile::TypeList* rhs_params = rhs.dex_file_->GetProtoParameters(*rhs.proto_id_);
     96     // Both lists are empty or have contents, or else shorty is broken.
     97     DCHECK_EQ(params == nullptr, rhs_params == nullptr);
     98     if (params != nullptr) {
     99       uint32_t params_size = params->Size();
    100       DCHECK_EQ(params_size, rhs_params->Size());  // Parameter list size must match.
    101       for (uint32_t i = 0; i < params_size; ++i) {
    102         const DexFile::TypeId& param_id = dex_file_->GetTypeId(params->GetTypeItem(i).type_idx_);
    103         const DexFile::TypeId& rhs_param_id =
    104             rhs.dex_file_->GetTypeId(rhs_params->GetTypeItem(i).type_idx_);
    105         if (!DexFileStringEquals(dex_file_, param_id.descriptor_idx_,
    106                                  rhs.dex_file_, rhs_param_id.descriptor_idx_)) {
    107           return false;  // Parameter type mismatch.
    108         }
    109       }
    110     }
    111   }
    112   return true;
    113 }
    114 
    115 
    116 }  // namespace art
    117 
    118 #endif  // ART_RUNTIME_DEX_FILE_INL_H_
    119