/*
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* Copyright (C) 2016 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_RUNTIME_IMTABLE_INL_H_
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#define ART_RUNTIME_IMTABLE_INL_H_
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#include "imtable.h"
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#include "art_method-inl.h"
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#include "dex/dex_file.h"
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#include "dex/utf.h"
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namespace art {
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static constexpr bool kImTableHashUseName = true;
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static constexpr bool kImTableHashUseCoefficients = true;
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// Magic configuration that minimizes some common runtime calls.
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static constexpr uint32_t kImTableHashCoefficientClass = 427;
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static constexpr uint32_t kImTableHashCoefficientName = 16;
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static constexpr uint32_t kImTableHashCoefficientSignature = 14;
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inline void ImTable::GetImtHashComponents(ArtMethod* method,
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uint32_t* class_hash,
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uint32_t* name_hash,
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uint32_t* signature_hash) {
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if (kImTableHashUseName) {
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if (method->IsProxyMethod()) {
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*class_hash = 0;
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*name_hash = 0;
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*signature_hash = 0;
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return;
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}
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const DexFile* dex_file = method->GetDexFile();
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const dex::MethodId& method_id = dex_file->GetMethodId(method->GetDexMethodIndex());
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// Class descriptor for the class component.
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*class_hash = ComputeModifiedUtf8Hash(dex_file->GetMethodDeclaringClassDescriptor(method_id));
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// Method name for the method component.
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*name_hash = ComputeModifiedUtf8Hash(dex_file->GetMethodName(method_id));
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const dex::ProtoId& proto_id = dex_file->GetMethodPrototype(method_id);
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// Read the proto for the signature component.
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uint32_t tmp = ComputeModifiedUtf8Hash(
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dex_file->GetTypeDescriptor(dex_file->GetTypeId(proto_id.return_type_idx_)));
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// Mix in the argument types.
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// Note: we could consider just using the shorty. This would be faster, at the price of
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// potential collisions.
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const dex::TypeList* param_types = dex_file->GetProtoParameters(proto_id);
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if (param_types != nullptr) {
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for (size_t i = 0; i != param_types->Size(); ++i) {
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const dex::TypeItem& type = param_types->GetTypeItem(i);
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tmp = 31 * tmp + ComputeModifiedUtf8Hash(
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dex_file->GetTypeDescriptor(dex_file->GetTypeId(type.type_idx_)));
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}
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}
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*signature_hash = tmp;
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return;
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} else {
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*class_hash = method->GetDexMethodIndex();
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*name_hash = 0;
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*signature_hash = 0;
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return;
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}
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}
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inline uint32_t ImTable::GetImtIndex(ArtMethod* method) {
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uint32_t class_hash, name_hash, signature_hash;
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GetImtHashComponents(method, &class_hash, &name_hash, &signature_hash);
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uint32_t mixed_hash;
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if (!kImTableHashUseCoefficients) {
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mixed_hash = class_hash + name_hash + signature_hash;
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} else {
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mixed_hash = kImTableHashCoefficientClass * class_hash +
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kImTableHashCoefficientName * name_hash +
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kImTableHashCoefficientSignature * signature_hash;
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}
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return mixed_hash % ImTable::kSize;
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}
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} // namespace art
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#endif // ART_RUNTIME_IMTABLE_INL_H_
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