92 lines
3.6 KiB
C++
92 lines
3.6 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_LIBDEXFILE_DEX_METHOD_REFERENCE_H_
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#define ART_LIBDEXFILE_DEX_METHOD_REFERENCE_H_
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#include <stdint.h>
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#include <string>
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#include "dex/dex_file.h"
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#include "dex/dex_file_reference.h"
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namespace art {
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// A method is uniquely located by its DexFile and the method_ids_ table index into that DexFile
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class MethodReference : public DexFileReference {
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public:
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MethodReference(const DexFile* file, uint32_t index) : DexFileReference(file, index) {}
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std::string PrettyMethod(bool with_signature = true) const {
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return dex_file->PrettyMethod(index, with_signature);
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}
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const dex::MethodId& GetMethodId() const {
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return dex_file->GetMethodId(index);
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}
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};
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// Compare the actual referenced method signatures. Used for method reference deduplication.
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struct MethodReferenceValueComparator {
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bool operator()(MethodReference mr1, MethodReference mr2) const {
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if (mr1.dex_file == mr2.dex_file) {
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DCHECK_EQ(mr1.index < mr2.index, SlowCompare(mr1, mr2));
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return mr1.index < mr2.index;
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} else {
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return SlowCompare(mr1, mr2);
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}
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}
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bool SlowCompare(MethodReference mr1, MethodReference mr2) const {
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// The order is the same as for method ids in a single dex file.
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// Compare the class descriptors first.
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const dex::MethodId& mid1 = mr1.GetMethodId();
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const dex::MethodId& mid2 = mr2.GetMethodId();
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int descriptor_diff = strcmp(mr1.dex_file->StringByTypeIdx(mid1.class_idx_),
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mr2.dex_file->StringByTypeIdx(mid2.class_idx_));
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if (descriptor_diff != 0) {
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return descriptor_diff < 0;
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}
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// Compare names second.
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int name_diff = strcmp(mr1.dex_file->GetMethodName(mid1), mr2.dex_file->GetMethodName(mid2));
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if (name_diff != 0) {
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return name_diff < 0;
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}
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// And then compare proto ids, starting with return type comparison.
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const dex::ProtoId& prid1 = mr1.dex_file->GetProtoId(mid1.proto_idx_);
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const dex::ProtoId& prid2 = mr2.dex_file->GetProtoId(mid2.proto_idx_);
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int return_type_diff = strcmp(mr1.dex_file->StringByTypeIdx(prid1.return_type_idx_),
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mr2.dex_file->StringByTypeIdx(prid2.return_type_idx_));
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if (return_type_diff != 0) {
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return return_type_diff < 0;
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}
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// And finishing with lexicographical parameter comparison.
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const dex::TypeList* params1 = mr1.dex_file->GetProtoParameters(prid1);
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size_t param1_size = (params1 != nullptr) ? params1->Size() : 0u;
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const dex::TypeList* params2 = mr2.dex_file->GetProtoParameters(prid2);
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size_t param2_size = (params2 != nullptr) ? params2->Size() : 0u;
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for (size_t i = 0, num = std::min(param1_size, param2_size); i != num; ++i) {
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int param_diff = strcmp(mr1.dex_file->StringByTypeIdx(params1->GetTypeItem(i).type_idx_),
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mr2.dex_file->StringByTypeIdx(params2->GetTypeItem(i).type_idx_));
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if (param_diff != 0) {
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return param_diff < 0;
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}
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}
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return param1_size < param2_size;
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}
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};
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} // namespace art
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#endif // ART_LIBDEXFILE_DEX_METHOD_REFERENCE_H_
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