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      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)
     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   void Run();
     41 
     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