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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_LIBDEXFILE_DEX_SIGNATURE_INL_H_
     18 #define ART_LIBDEXFILE_DEX_SIGNATURE_INL_H_
     19 
     20 #include "signature.h"
     21 
     22 #include "dex_file-inl.h"
     23 
     24 namespace art {
     25 
     26 inline bool Signature::operator==(const Signature& rhs) const {
     27   if (dex_file_ == nullptr) {
     28     return rhs.dex_file_ == nullptr;
     29   }
     30   if (rhs.dex_file_ == nullptr) {
     31     return false;
     32   }
     33   if (dex_file_ == rhs.dex_file_) {
     34     return proto_id_ == rhs.proto_id_;
     35   }
     36   uint32_t lhs_shorty_len;  // For a shorty utf16 length == mutf8 length.
     37   const char* lhs_shorty_data = dex_file_->StringDataAndUtf16LengthByIdx(proto_id_->shorty_idx_,
     38                                                                          &lhs_shorty_len);
     39   std::string_view lhs_shorty(lhs_shorty_data, lhs_shorty_len);
     40   {
     41     uint32_t rhs_shorty_len;
     42     const char* rhs_shorty_data =
     43         rhs.dex_file_->StringDataAndUtf16LengthByIdx(rhs.proto_id_->shorty_idx_,
     44                                                      &rhs_shorty_len);
     45     std::string_view rhs_shorty(rhs_shorty_data, rhs_shorty_len);
     46     if (lhs_shorty != rhs_shorty) {
     47       return false;  // Shorty mismatch.
     48     }
     49   }
     50   if (lhs_shorty[0] == 'L') {
     51     const dex::TypeId& return_type_id = dex_file_->GetTypeId(proto_id_->return_type_idx_);
     52     const dex::TypeId& rhs_return_type_id =
     53         rhs.dex_file_->GetTypeId(rhs.proto_id_->return_type_idx_);
     54     if (!DexFile::StringEquals(dex_file_, return_type_id.descriptor_idx_,
     55                                rhs.dex_file_, rhs_return_type_id.descriptor_idx_)) {
     56       return false;  // Return type mismatch.
     57     }
     58   }
     59   if (lhs_shorty.find('L', 1) != std::string_view::npos) {
     60     const dex::TypeList* params = dex_file_->GetProtoParameters(*proto_id_);
     61     const dex::TypeList* rhs_params = rhs.dex_file_->GetProtoParameters(*rhs.proto_id_);
     62     // We found a reference parameter in the matching shorty, so both lists must be non-empty.
     63     DCHECK(params != nullptr);
     64     DCHECK(rhs_params != nullptr);
     65     uint32_t params_size = params->Size();
     66     DCHECK_EQ(params_size, rhs_params->Size());  // Parameter list size must match.
     67     for (uint32_t i = 0; i < params_size; ++i) {
     68       const dex::TypeId& param_id = dex_file_->GetTypeId(params->GetTypeItem(i).type_idx_);
     69       const dex::TypeId& rhs_param_id =
     70           rhs.dex_file_->GetTypeId(rhs_params->GetTypeItem(i).type_idx_);
     71       if (!DexFile::StringEquals(dex_file_, param_id.descriptor_idx_,
     72                                  rhs.dex_file_, rhs_param_id.descriptor_idx_)) {
     73         return false;  // Parameter type mismatch.
     74       }
     75     }
     76   }
     77   return true;
     78 }
     79 
     80 }  // namespace art
     81 
     82 #endif  // ART_LIBDEXFILE_DEX_SIGNATURE_INL_H_
     83