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_CONSTANT_FOLDING_H_ 18 #define ART_COMPILER_OPTIMIZING_CONSTANT_FOLDING_H_ 19 20 #include "nodes.h" 21 #include "optimization.h" 22 23 namespace art { 24 25 /** 26 * Optimization pass performing a simple constant-expression 27 * evaluation on the SSA form. 28 * 29 * Note that graph simplifications producing a constant should be 30 * implemented in art::HConstantFolding, while graph simplifications 31 * not producing constants should be implemented in 32 * art::InstructionSimplifier. (This convention is a choice that was 33 * made during the development of these parts of the compiler and is 34 * not bound by any technical requirement.) 35 * 36 * This class is named art::HConstantFolding to avoid name 37 * clashes with the art::ConstantPropagation class defined in 38 * compiler/dex/post_opt_passes.h. 39 */ 40 class HConstantFolding : public HOptimization { 41 public: HConstantFolding(HGraph * graph,const char * name)42 HConstantFolding(HGraph* graph, const char* name) : HOptimization(graph, name) {} 43 44 bool Run() override; 45 46 static constexpr const char* kConstantFoldingPassName = "constant_folding"; 47 48 private: 49 DISALLOW_COPY_AND_ASSIGN(HConstantFolding); 50 }; 51 52 } // namespace art 53 54 #endif // ART_COMPILER_OPTIMIZING_CONSTANT_FOLDING_H_ 55