Mathieu Chartier | de4b08f | 2017-07-10 14:13:41 -0700 | [diff] [blame] | 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_ |