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 /** 25 * A simplification pass over the graph before doing register allocation. 26 * For example it changes uses of null checks and bounds checks to the original 27 * objects, to avoid creating a live range for these checks. 28 */ 29 class PrepareForRegisterAllocation : public HGraphDelegateVisitor { 30 public: PrepareForRegisterAllocation(HGraph * graph)31 explicit PrepareForRegisterAllocation(HGraph* graph) : HGraphDelegateVisitor(graph) {} 32 33 void Run(); 34 35 static constexpr const char* kPrepareForRegisterAllocationPassName = 36 "prepare_for_register_allocation"; 37 38 private: 39 void VisitNullCheck(HNullCheck* check) OVERRIDE; 40 void VisitDivZeroCheck(HDivZeroCheck* check) OVERRIDE; 41 void VisitBoundsCheck(HBoundsCheck* check) OVERRIDE; 42 void VisitBoundType(HBoundType* bound_type) OVERRIDE; 43 void VisitArraySet(HArraySet* instruction) OVERRIDE; 44 void VisitClinitCheck(HClinitCheck* check) OVERRIDE; 45 void VisitCondition(HCondition* condition) OVERRIDE; 46 void VisitConstructorFence(HConstructorFence* constructor_fence) OVERRIDE; 47 void VisitInvokeStaticOrDirect(HInvokeStaticOrDirect* invoke) OVERRIDE; 48 void VisitDeoptimize(HDeoptimize* deoptimize) OVERRIDE; 49 50 bool CanMoveClinitCheck(HInstruction* input, HInstruction* user) const; 51 bool CanEmitConditionAt(HCondition* condition, HInstruction* user) const; 52 53 DISALLOW_COPY_AND_ASSIGN(PrepareForRegisterAllocation); 54 }; 55 56 } // namespace art 57 58 #endif // ART_COMPILER_OPTIMIZING_PREPARE_FOR_REGISTER_ALLOCATION_H_ 59