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_PREPARE_FOR_REGISTER_ALLOCATION_H_ 18 #define ART_COMPILER_OPTIMIZING_PREPARE_FOR_REGISTER_ALLOCATION_H_ 19 20 #include "nodes.h" 21 22 namespace art { 23 24 class CompilerOptions; 25 class OptimizingCompilerStats; 26 27 /** 28 * A simplification pass over the graph before doing register allocation. 29 * For example it changes uses of null checks and bounds checks to the original 30 * objects, to avoid creating a live range for these checks. 31 */ 32 class PrepareForRegisterAllocation : public HGraphDelegateVisitor { 33 public: 34 PrepareForRegisterAllocation(HGraph* graph, 35 const CompilerOptions& compiler_options, 36 OptimizingCompilerStats* stats = nullptr) HGraphDelegateVisitor(graph,stats)37 : HGraphDelegateVisitor(graph, stats), 38 compiler_options_(compiler_options) {} 39 40 void Run(); 41 42 static constexpr const char* kPrepareForRegisterAllocationPassName = 43 "prepare_for_register_allocation"; 44 45 private: 46 void VisitCheckCast(HCheckCast* check_cast) override; 47 void VisitInstanceOf(HInstanceOf* instance_of) override; 48 void VisitNullCheck(HNullCheck* check) override; 49 void VisitDivZeroCheck(HDivZeroCheck* check) override; 50 void VisitBoundsCheck(HBoundsCheck* check) override; 51 void VisitBoundType(HBoundType* bound_type) override; 52 void VisitArraySet(HArraySet* instruction) override; 53 void VisitClinitCheck(HClinitCheck* check) override; 54 void VisitCondition(HCondition* condition) override; 55 void VisitConstructorFence(HConstructorFence* constructor_fence) override; 56 void VisitInvokeStaticOrDirect(HInvokeStaticOrDirect* invoke) override; 57 void VisitDeoptimize(HDeoptimize* deoptimize) override; 58 void VisitTypeConversion(HTypeConversion* instruction) override; 59 60 bool CanMoveClinitCheck(HInstruction* input, HInstruction* user) const; 61 bool CanEmitConditionAt(HCondition* condition, HInstruction* user) const; 62 63 const CompilerOptions& compiler_options_; 64 65 DISALLOW_COPY_AND_ASSIGN(PrepareForRegisterAllocation); 66 }; 67 68 } // namespace art 69 70 #endif // ART_COMPILER_OPTIMIZING_PREPARE_FOR_REGISTER_ALLOCATION_H_ 71