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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
namespace art {
class ArtMethod;
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;
ArtMethod* Get(size_t index, PointerSize pointer_size) {
DCHECK_LT(index, kSize);
uint8_t* ptr = reinterpret_cast<uint8_t*>(this) + OffsetOfElement(index, pointer_size);
if (pointer_size == PointerSize::k32) {
uint32_t value = *reinterpret_cast<uint32_t*>(ptr);
return reinterpret_cast<ArtMethod*>(value);
} else {
uint64_t value = *reinterpret_cast<uint64_t*>(ptr);
return reinterpret_cast<ArtMethod*>(value);
}
}
void Set(size_t index, ArtMethod* method, PointerSize pointer_size) {
DCHECK_LT(index, kSize);
uint8_t* ptr = reinterpret_cast<uint8_t*>(this) + OffsetOfElement(index, pointer_size);
if (pointer_size == PointerSize::k32) {
uintptr_t value = reinterpret_cast<uintptr_t>(method);
DCHECK_EQ(static_cast<uint32_t>(value), value); // Check that we dont lose any non 0 bits.
*reinterpret_cast<uint32_t*>(ptr) = static_cast<uint32_t>(value);
} else {
*reinterpret_cast<uint64_t*>(ptr) = reinterpret_cast<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);
}
};
} // namespace art
#endif // ART_RUNTIME_IMTABLE_H_