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 23namespace 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 */ 40class HConstantFolding : public HOptimization { 41 public: 42 HConstantFolding(HGraph* graph, const char* name = kConstantFoldingPassName) 43 : HOptimization(graph, name) {} 44 45 void Run() OVERRIDE; 46 47 static constexpr const char* kConstantFoldingPassName = "constant_folding"; 48 49 private: 50 DISALLOW_COPY_AND_ASSIGN(HConstantFolding); 51}; 52 53} // namespace art 54 55#endif // ART_COMPILER_OPTIMIZING_CONSTANT_FOLDING_H_ 56