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