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/*
* Copyright (C) 2016 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_RUNTIME_IMTABLE_H_
#define ART_RUNTIME_IMTABLE_H_
#ifndef IMT_SIZE
#error IMT_SIZE not defined
#endif
#include "base/casts.h"
#include "base/enums.h"
#include "base/locks.h"
#include "base/macros.h"
namespace art {
class ArtMethod;
class DexFile;
class ImTable {
public:
// Interface method table size. Increasing this value reduces the chance of two interface methods
// colliding in the interface method table but increases the size of classes that implement
// (non-marker) interfaces.
static constexpr size_t kSize = IMT_SIZE;
uint8_t* AddressOfElement(size_t index, PointerSize pointer_size) {
return reinterpret_cast<uint8_t*>(this) + OffsetOfElement(index, pointer_size);
}
ArtMethod* Get(size_t index, PointerSize pointer_size) {
DCHECK_LT(index, kSize);
uint8_t* ptr = AddressOfElement(index, pointer_size);
if (pointer_size == PointerSize::k32) {
uint32_t value = *reinterpret_cast<uint32_t*>(ptr);
return reinterpret_cast32<ArtMethod*>(value);
} else {
uint64_t value = *reinterpret_cast<uint64_t*>(ptr);
return reinterpret_cast64<ArtMethod*>(value);
}
}
void Set(size_t index, ArtMethod* method, PointerSize pointer_size) {
DCHECK_LT(index, kSize);
uint8_t* ptr = AddressOfElement(index, pointer_size);
if (pointer_size == PointerSize::k32) {
*reinterpret_cast<uint32_t*>(ptr) = reinterpret_cast32<uint32_t>(method);
} else {
*reinterpret_cast<uint64_t*>(ptr) = reinterpret_cast64<uint64_t>(method);
}
}
static size_t OffsetOfElement(size_t index, PointerSize pointer_size) {
return index * static_cast<size_t>(pointer_size);
}
void Populate(ArtMethod** data, PointerSize pointer_size) {
for (size_t i = 0; i < kSize; ++i) {
Set(i, data[i], pointer_size);
}
}
constexpr static size_t SizeInBytes(PointerSize pointer_size) {
return kSize * static_cast<size_t>(pointer_size);
}
// Converts a method to the base hash components used in GetImtIndex.
ALWAYS_INLINE static inline void GetImtHashComponents(ArtMethod* method,
uint32_t* class_hash,
uint32_t* name_hash,
uint32_t* signature_hash)
REQUIRES_SHARED(Locks::mutator_lock_);
// The (complete) hashing scheme to map an ArtMethod to a slot in the Interface Method Table
// (IMT).
ALWAYS_INLINE static inline uint32_t GetImtIndex(ArtMethod* method)
REQUIRES_SHARED(Locks::mutator_lock_);
};
} // namespace art
#endif // ART_RUNTIME_IMTABLE_H_
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