100 lines
3.6 KiB
C++
100 lines
3.6 KiB
C++
/*
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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_H_
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#define ART_RUNTIME_IMTABLE_H_
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#include "base/bit_utils.h"
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#include "base/casts.h"
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#include "base/enums.h"
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#include "base/locks.h"
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#include "base/macros.h"
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namespace art {
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class ArtMethod;
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class DexFile;
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class ImTable {
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public:
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// Interface method table size. Increasing this value reduces the chance of two interface methods
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// colliding in the interface method table but increases the size of classes that implement
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// (non-marker) interfaces.
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// When this value changes, old images become incompatible, so image file version must change too.
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static constexpr size_t kSize = 43;
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// Default methods cannot store the imt_index, so instead we make its IMT index depend on the
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// method_index and mask it with the closest power of 2 of kSize - 1. This
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// is to simplify fetching it in the interpreter.
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static constexpr size_t kSizeTruncToPowerOfTwo = TruncToPowerOfTwo(kSize);
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uint8_t* AddressOfElement(size_t index, PointerSize pointer_size) {
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return reinterpret_cast<uint8_t*>(this) + OffsetOfElement(index, pointer_size);
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}
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ArtMethod* Get(size_t index, PointerSize pointer_size) {
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DCHECK_LT(index, kSize);
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uint8_t* ptr = AddressOfElement(index, pointer_size);
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if (pointer_size == PointerSize::k32) {
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uint32_t value = *reinterpret_cast<uint32_t*>(ptr);
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return reinterpret_cast32<ArtMethod*>(value);
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} else {
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uint64_t value = *reinterpret_cast<uint64_t*>(ptr);
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return reinterpret_cast64<ArtMethod*>(value);
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}
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}
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void Set(size_t index, ArtMethod* method, PointerSize pointer_size) {
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DCHECK_LT(index, kSize);
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uint8_t* ptr = AddressOfElement(index, pointer_size);
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if (pointer_size == PointerSize::k32) {
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*reinterpret_cast<uint32_t*>(ptr) = reinterpret_cast32<uint32_t>(method);
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} else {
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*reinterpret_cast<uint64_t*>(ptr) = reinterpret_cast64<uint64_t>(method);
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}
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}
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static size_t OffsetOfElement(size_t index, PointerSize pointer_size) {
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return index * static_cast<size_t>(pointer_size);
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}
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void Populate(ArtMethod** data, PointerSize pointer_size) {
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for (size_t i = 0; i < kSize; ++i) {
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Set(i, data[i], pointer_size);
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}
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}
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constexpr static size_t SizeInBytes(PointerSize pointer_size) {
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return kSize * static_cast<size_t>(pointer_size);
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}
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// Converts a method to the base hash components used in GetImtIndex.
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ALWAYS_INLINE static inline void 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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REQUIRES_SHARED(Locks::mutator_lock_);
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// The (complete) hashing scheme to map an ArtMethod to a slot in the Interface Method Table
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// (IMT).
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ALWAYS_INLINE static inline uint32_t GetImtIndex(ArtMethod* method)
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REQUIRES_SHARED(Locks::mutator_lock_);
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};
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} // namespace art
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#endif // ART_RUNTIME_IMTABLE_H_
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