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 "base/macros.h" 21 #include "nodes.h" 22 #include "optimization.h" 23 #include "optimizing/optimizing_compiler_stats.h" 24 25 namespace art HIDDEN { 26 27 /** 28 * Optimization pass performing a simple constant-expression 29 * evaluation on the SSA form. 30 * 31 * Note that graph simplifications producing a constant should be 32 * implemented in art::HConstantFolding, while graph simplifications 33 * not producing constants should be implemented in 34 * art::InstructionSimplifier. (This convention is a choice that was 35 * made during the development of these parts of the compiler and is 36 * not bound by any technical requirement.) 37 * 38 * This class is named art::HConstantFolding to avoid name 39 * clashes with the art::ConstantPropagation class defined in 40 * compiler/dex/post_opt_passes.h. 41 */ 42 class HConstantFolding : public HOptimization { 43 public: 44 HConstantFolding(HGraph* graph, 45 OptimizingCompilerStats* stats = nullptr, 46 const char* name = kConstantFoldingPassName) HOptimization(graph,name,stats)47 : HOptimization(graph, name, stats) {} 48 49 bool Run() override; 50 51 static constexpr const char* kConstantFoldingPassName = "constant_folding"; 52 53 private: 54 DISALLOW_COPY_AND_ASSIGN(HConstantFolding); 55 }; 56 57 } // namespace art 58 59 #endif // ART_COMPILER_OPTIMIZING_CONSTANT_FOLDING_H_ 60