1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_RUNTIME_QUICKEN_INFO_H_ 18 #define ART_RUNTIME_QUICKEN_INFO_H_ 19 20 #include "dex_instruction.h" 21 22 namespace art { 23 24 // QuickenInfoTable is a table of 16 bit dex indices. There is one slot fo every instruction that is 25 // possibly dequickenable. 26 class QuickenInfoTable { 27 public: 28 explicit QuickenInfoTable(const uint8_t* data) : data_(data) {} 29 30 bool IsNull() const { 31 return data_ == nullptr; 32 } 33 34 uint16_t GetData(size_t index) const { 35 return data_[index * 2] | (static_cast<uint16_t>(data_[index * 2 + 1]) << 8); 36 } 37 38 // Returns true if the dex instruction has an index in the table. (maybe dequickenable). 39 static bool NeedsIndexForInstruction(const Instruction* inst) { 40 return inst->IsQuickened() || inst->Opcode() == Instruction::NOP; 41 } 42 43 static size_t NumberOfIndices(size_t bytes) { 44 return bytes / sizeof(uint16_t); 45 } 46 47 private: 48 const uint8_t* const data_; 49 50 DISALLOW_COPY_AND_ASSIGN(QuickenInfoTable); 51 }; 52 53 } // namespace art 54 55 #endif // ART_RUNTIME_QUICKEN_INFO_H_ 56
