| /* |
| * 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. |
| */ |
| |
| #pragma once |
| |
| #include "common.h" |
| #include "dex_format.h" |
| |
| #include <vector> |
| |
| namespace ir { |
| |
| // A simple index tracking and allocator |
| class IndexMap { |
| public: |
| dex::u4 AllocateIndex() { |
| const auto size = indexes_map_.size(); |
| while (alloc_pos_ < size && indexes_map_[alloc_pos_]) { |
| ++alloc_pos_; |
| } |
| MarkUsedIndex(alloc_pos_); |
| return alloc_pos_++; |
| } |
| |
| void MarkUsedIndex(dex::u4 index) { |
| if (index >= indexes_map_.size()) { |
| indexes_map_.resize(index + 1); |
| } |
| SLICER_CHECK(!indexes_map_[index]); |
| indexes_map_[index] = true; |
| } |
| |
| private: |
| std::vector<bool> indexes_map_; |
| dex::u4 alloc_pos_ = 0; |
| }; |
| |
| } // namespace ir |