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 "nodes.h" 21 #include "optimization.h" 22 23 namespace art { 24 25 class SideEffectsAnalysis : public HOptimization { 26 public: SideEffectsAnalysis(HGraph * graph)27 explicit SideEffectsAnalysis(HGraph* graph) 28 : HOptimization(graph, true, kSideEffectsAnalysisPassName), 29 graph_(graph), 30 block_effects_(graph->GetArena(), graph->GetBlocks().Size(), SideEffects::None()), 31 loop_effects_(graph->GetArena(), graph->GetBlocks().Size(), SideEffects::None()) {} 32 33 SideEffects GetLoopEffects(HBasicBlock* block) const; 34 SideEffects GetBlockEffects(HBasicBlock* block) const; 35 36 // Compute side effects of individual blocks and loops. 37 void Run(); 38 HasRun()39 bool HasRun() const { return has_run_; } 40 41 static constexpr const char* kSideEffectsAnalysisPassName = "SideEffects"; 42 43 private: 44 void UpdateLoopEffects(HLoopInformation* info, SideEffects effects); 45 46 HGraph* graph_; 47 48 // Checked in debug build, to ensure the pass has been run prior to 49 // running a pass that depends on it. 50 bool has_run_ = false; 51 52 // Side effects of individual blocks, that is the union of the side effects 53 // of the instructions in the block. 54 GrowableArray<SideEffects> block_effects_; 55 56 // Side effects of loops, that is the union of the side effects of the 57 // blocks contained in that loop. 58 GrowableArray<SideEffects> loop_effects_; 59 60 ART_FRIEND_TEST(GVNTest, LoopSideEffects); 61 DISALLOW_COPY_AND_ASSIGN(SideEffectsAnalysis); 62 }; 63 64 } // namespace art 65 66 #endif // ART_COMPILER_OPTIMIZING_SIDE_EFFECTS_ANALYSIS_H_ 67