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/*
* Copyright (C) 2017 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_QUICKEN_INFO_H_
#define ART_RUNTIME_QUICKEN_INFO_H_
#include "base/array_ref.h"
#include "base/leb128.h"
#include "dex/compact_offset_table.h"
#include "dex/dex_instruction.h"
namespace art {
// QuickenInfoTable is a table of 16 bit dex indices. There is one slot for every instruction that
// is possibly dequickenable.
class QuickenInfoTable {
public:
class Builder {
public:
Builder(std::vector<uint8_t>* out_data, size_t num_elements) : out_data_(out_data) {
EncodeUnsignedLeb128(out_data_, num_elements);
}
void AddIndex(uint16_t index) {
out_data_->push_back(static_cast<uint8_t>(index));
out_data_->push_back(static_cast<uint8_t>(index >> 8));
}
private:
std::vector<uint8_t>* const out_data_;
};
explicit QuickenInfoTable(ArrayRef<const uint8_t> data)
: data_(data.data()),
num_elements_(!data.empty() ? DecodeUnsignedLeb128(&data_) : 0u) {}
bool IsNull() const {
return data_ == nullptr;
}
uint16_t GetData(size_t index) const {
return data_[index * 2] | (static_cast<uint16_t>(data_[index * 2 + 1]) << 8);
}
// Returns true if the dex instruction has an index in the table. (maybe dequickenable).
static bool NeedsIndexForInstruction(const Instruction* inst) {
return inst->IsQuickened();
}
static size_t NumberOfIndices(size_t bytes) {
return bytes / sizeof(uint16_t);
}
static size_t SizeInBytes(ArrayRef<const uint8_t> data) {
QuickenInfoTable table(data);
return table.data_ + table.NumIndices() * 2 - data.data();
}
uint32_t NumIndices() const {
return num_elements_;
}
private:
const uint8_t* data_;
const uint32_t num_elements_;
DISALLOW_COPY_AND_ASSIGN(QuickenInfoTable);
};
} // namespace art
#endif // ART_RUNTIME_QUICKEN_INFO_H_
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