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_SSA_BUILDER_H_ 18 #define ART_COMPILER_OPTIMIZING_SSA_BUILDER_H_ 19 20 #include "nodes.h" 21 22 namespace art { 23 24 static constexpr int kDefaultNumberOfLoops = 2; 25 26 class SsaBuilder : public HGraphVisitor { 27 public: 28 explicit SsaBuilder(HGraph* graph) 29 : HGraphVisitor(graph), 30 current_locals_(nullptr), 31 loop_headers_(graph->GetArena(), kDefaultNumberOfLoops), 32 locals_for_(graph->GetArena(), graph->GetBlocks().Size()) { 33 locals_for_.SetSize(graph->GetBlocks().Size()); 34 } 35 36 void BuildSsa(); 37 38 GrowableArray<HInstruction*>* GetLocalsFor(HBasicBlock* block) { 39 HEnvironment* env = locals_for_.Get(block->GetBlockId()); 40 if (env == nullptr) { 41 env = new (GetGraph()->GetArena()) HEnvironment( 42 GetGraph()->GetArena(), GetGraph()->GetNumberOfVRegs()); 43 locals_for_.Put(block->GetBlockId(), env); 44 } 45 return env->GetVRegs(); 46 } 47 48 HInstruction* ValueOfLocal(HBasicBlock* block, size_t local); 49 50 void VisitBasicBlock(HBasicBlock* block); 51 void VisitLoadLocal(HLoadLocal* load); 52 void VisitStoreLocal(HStoreLocal* store); 53 void VisitInstruction(HInstruction* instruction); 54 55 private: 56 // Locals for the current block being visited. 57 GrowableArray<HInstruction*>* current_locals_; 58 59 // Keep track of loop headers found. The last phase of the analysis iterates 60 // over these blocks to set the inputs of their phis. 61 GrowableArray<HBasicBlock*> loop_headers_; 62 63 // HEnvironment for each block. 64 GrowableArray<HEnvironment*> locals_for_; 65 66 DISALLOW_COPY_AND_ASSIGN(SsaBuilder); 67 }; 68 69 } // namespace art 70 71 #endif // ART_COMPILER_OPTIMIZING_SSA_BUILDER_H_ 72
