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/*
* Copyright (C) 2023 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_LIBDEXFILE_DEX_PROTO_REFERENCE_H_
#define ART_LIBDEXFILE_DEX_PROTO_REFERENCE_H_
#include <stdint.h>
#include <android-base/logging.h>
#include <string_view>
#include "dex/dex_file-inl.h"
#include "dex/dex_file_reference.h"
#include "dex/dex_file_types.h"
namespace art {
// A proto is located by its DexFile and the proto_ids_ table index into that DexFile.
class ProtoReference : public DexFileReference {
public:
ProtoReference(const DexFile* file, dex::ProtoIndex index)
: DexFileReference(file, index.index_) {}
dex::ProtoIndex ProtoIndex() const {
return dex::ProtoIndex(index);
}
const dex::ProtoId& ProtoId() const {
return dex_file->GetProtoId(ProtoIndex());
}
std::string_view ReturnType() const {
return dex_file->GetTypeDescriptorView(dex_file->GetTypeId(ProtoId().return_type_idx_));
}
};
struct ProtoReferenceValueComparator {
bool operator()(const ProtoReference& lhs, const ProtoReference& rhs) const {
if (lhs.dex_file == rhs.dex_file) {
DCHECK_EQ(lhs.index < rhs.index, SlowCompare(lhs, rhs));
return lhs.index < rhs.index;
} else {
return SlowCompare(lhs, rhs);
}
}
bool SlowCompare(const ProtoReference& lhs, const ProtoReference& rhs) const {
// Compare return type first.
const dex::ProtoId& prid1 = lhs.ProtoId();
const dex::ProtoId& prid2 = rhs.ProtoId();
int return_type_diff = lhs.ReturnType().compare(rhs.ReturnType());
if (return_type_diff != 0) {
return return_type_diff < 0;
}
// And then compare parameters lexicographically.
const dex::TypeList* params1 = lhs.dex_file->GetProtoParameters(prid1);
size_t param1_size = (params1 != nullptr) ? params1->Size() : 0u;
const dex::TypeList* params2 = rhs.dex_file->GetProtoParameters(prid2);
size_t param2_size = (params2 != nullptr) ? params2->Size() : 0u;
for (size_t i = 0, num = std::min(param1_size, param2_size); i != num; ++i) {
std::string_view l_param = lhs.dex_file->GetTypeDescriptorView(
lhs.dex_file->GetTypeId(params1->GetTypeItem(i).type_idx_));
std::string_view r_param = rhs.dex_file->GetTypeDescriptorView(
rhs.dex_file->GetTypeId(params2->GetTypeItem(i).type_idx_));
int param_diff = l_param.compare(r_param);
if (param_diff != 0) {
return param_diff < 0;
}
}
return param1_size < param2_size;
}
};
} // namespace art
#endif // ART_LIBDEXFILE_DEX_PROTO_REFERENCE_H_
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