1 /* 2 * Copyright (C) 2013 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_METHOD_REFERENCE_H_ 18 #define ART_RUNTIME_METHOD_REFERENCE_H_ 19 20 #include <stdint.h> 21 #include <string> 22 #include "dex_file.h" 23 24 namespace art { 25 26 // A method is uniquely located by its DexFile and the method_ids_ table index into that DexFile 27 struct MethodReference { 28 MethodReference(const DexFile* file, uint32_t index) : dex_file(file), dex_method_index(index) { 29 } 30 std::string PrettyMethod(bool with_signature = true) { 31 return dex_file->PrettyMethod(dex_method_index, with_signature); 32 } 33 const DexFile* dex_file; 34 uint32_t dex_method_index; 35 }; 36 37 struct MethodReferenceComparator { 38 bool operator()(MethodReference mr1, MethodReference mr2) const { 39 if (mr1.dex_file == mr2.dex_file) { 40 return mr1.dex_method_index < mr2.dex_method_index; 41 } else { 42 return mr1.dex_file < mr2.dex_file; 43 } 44 } 45 }; 46 47 // Compare the actual referenced method signatures. Used for method reference deduplication. 48 struct MethodReferenceValueComparator { 49 bool operator()(MethodReference mr1, MethodReference mr2) const { 50 if (mr1.dex_file == mr2.dex_file) { 51 DCHECK_EQ(mr1.dex_method_index < mr2.dex_method_index, SlowCompare(mr1, mr2)); 52 return mr1.dex_method_index < mr2.dex_method_index; 53 } else { 54 return SlowCompare(mr1, mr2); 55 } 56 } 57 58 bool SlowCompare(MethodReference mr1, MethodReference mr2) const { 59 // The order is the same as for method ids in a single dex file. 60 // Compare the class descriptors first. 61 const DexFile::MethodId& mid1 = mr1.dex_file->GetMethodId(mr1.dex_method_index); 62 const DexFile::MethodId& mid2 = mr2.dex_file->GetMethodId(mr2.dex_method_index); 63 int descriptor_diff = strcmp(mr1.dex_file->StringByTypeIdx(mid1.class_idx_), 64 mr2.dex_file->StringByTypeIdx(mid2.class_idx_)); 65 if (descriptor_diff != 0) { 66 return descriptor_diff < 0; 67 } 68 // Compare names second. 69 int name_diff = strcmp(mr1.dex_file->GetMethodName(mid1), mr2.dex_file->GetMethodName(mid2)); 70 if (name_diff != 0) { 71 return name_diff < 0; 72 } 73 // And then compare proto ids, starting with return type comparison. 74 const DexFile::ProtoId& prid1 = mr1.dex_file->GetProtoId(mid1.proto_idx_); 75 const DexFile::ProtoId& prid2 = mr2.dex_file->GetProtoId(mid2.proto_idx_); 76 int return_type_diff = strcmp(mr1.dex_file->StringByTypeIdx(prid1.return_type_idx_), 77 mr2.dex_file->StringByTypeIdx(prid2.return_type_idx_)); 78 if (return_type_diff != 0) { 79 return return_type_diff < 0; 80 } 81 // And finishing with lexicographical parameter comparison. 82 const DexFile::TypeList* params1 = mr1.dex_file->GetProtoParameters(prid1); 83 size_t param1_size = (params1 != nullptr) ? params1->Size() : 0u; 84 const DexFile::TypeList* params2 = mr2.dex_file->GetProtoParameters(prid2); 85 size_t param2_size = (params2 != nullptr) ? params2->Size() : 0u; 86 for (size_t i = 0, num = std::min(param1_size, param2_size); i != num; ++i) { 87 int param_diff = strcmp(mr1.dex_file->StringByTypeIdx(params1->GetTypeItem(i).type_idx_), 88 mr2.dex_file->StringByTypeIdx(params2->GetTypeItem(i).type_idx_)); 89 if (param_diff != 0) { 90 return param_diff < 0; 91 } 92 } 93 return param1_size < param2_size; 94 } 95 }; 96 97 } // namespace art 98 99 #endif // ART_RUNTIME_METHOD_REFERENCE_H_ 100
