1 /* 2 * Copyright (C) 2014 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_COMPILER_OPTIMIZING_SIDE_EFFECTS_ANALYSIS_H_ 18 #define ART_COMPILER_OPTIMIZING_SIDE_EFFECTS_ANALYSIS_H_ 19 20 #include "base/arena_containers.h" 21 #include "nodes.h" 22 #include "optimization.h" 23 24 namespace art { 25 26 class SideEffectsAnalysis : public HOptimization { 27 public: 28 explicit SideEffectsAnalysis(HGraph* graph, const char* pass_name = kSideEffectsAnalysisPassName) HOptimization(graph,pass_name)29 : HOptimization(graph, pass_name), 30 graph_(graph), 31 block_effects_(graph->GetBlocks().size(), 32 graph->GetAllocator()->Adapter(kArenaAllocSideEffectsAnalysis)), 33 loop_effects_(graph->GetBlocks().size(), 34 graph->GetAllocator()->Adapter(kArenaAllocSideEffectsAnalysis)) {} 35 36 SideEffects GetLoopEffects(HBasicBlock* block) const; 37 SideEffects GetBlockEffects(HBasicBlock* block) const; 38 39 // Compute side effects of individual blocks and loops. 40 bool Run(); 41 HasRun()42 bool HasRun() const { return has_run_; } 43 44 static constexpr const char* kSideEffectsAnalysisPassName = "side_effects"; 45 46 private: 47 void UpdateLoopEffects(HLoopInformation* info, SideEffects effects); 48 49 HGraph* graph_; 50 51 // Checked in debug build, to ensure the pass has been run prior to 52 // running a pass that depends on it. 53 bool has_run_ = false; 54 55 // Side effects of individual blocks, that is the union of the side effects 56 // of the instructions in the block. 57 ArenaVector<SideEffects> block_effects_; 58 59 // Side effects of loops, that is the union of the side effects of the 60 // blocks contained in that loop. 61 ArenaVector<SideEffects> loop_effects_; 62 63 ART_FRIEND_TEST(GVNTest, LoopSideEffects); 64 DISALLOW_COPY_AND_ASSIGN(SideEffectsAnalysis); 65 }; 66 67 } // namespace art 68 69 #endif // ART_COMPILER_OPTIMIZING_SIDE_EFFECTS_ANALYSIS_H_ 70