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_OPTIMIZATION_H_ 18 #define ART_COMPILER_OPTIMIZING_OPTIMIZATION_H_ 19 20 #include "base/arena_object.h" 21 #include "nodes.h" 22 #include "optimizing_compiler_stats.h" 23 24 namespace art { 25 26 class CodeGenerator; 27 class DexCompilationUnit; 28 29 /** 30 * Abstraction to implement an optimization pass. 31 */ 32 class HOptimization : public ArenaObject<kArenaAllocOptimization> { 33 public: 34 HOptimization(HGraph* graph, 35 const char* pass_name, 36 OptimizingCompilerStats* stats = nullptr) graph_(graph)37 : graph_(graph), 38 stats_(stats), 39 pass_name_(pass_name) {} 40 ~HOptimization()41 virtual ~HOptimization() {} 42 43 // Return the name of the pass. Pass names for a single HOptimization should be of form 44 // <optimization_name> or <optimization_name>$<pass_name> for common <optimization_name> prefix. 45 // Example: 'instruction_simplifier', 'instruction_simplifier$after_bce', 46 // 'instruction_simplifier$before_codegen'. GetPassName()47 const char* GetPassName() const { return pass_name_; } 48 49 // Perform the pass or analysis. Returns false if no optimizations occurred or no useful 50 // information was computed (this is best effort, returning true is always ok). 51 virtual bool Run() = 0; 52 53 protected: 54 HGraph* const graph_; 55 // Used to record stats about the optimization. 56 OptimizingCompilerStats* const stats_; 57 58 private: 59 // Optimization pass name. 60 const char* pass_name_; 61 62 DISALLOW_COPY_AND_ASSIGN(HOptimization); 63 }; 64 65 // Optimization passes that can be constructed by the helper method below. An enum 66 // field is preferred over a string lookup at places where performance matters. 67 // TODO: generate this table and lookup methods below automatically? 68 enum class OptimizationPass { 69 kBoundsCheckElimination, 70 kCHAGuardOptimization, 71 kCodeSinking, 72 kConstantFolding, 73 kConstructorFenceRedundancyElimination, 74 kDeadCodeElimination, 75 kGlobalValueNumbering, 76 kInductionVarAnalysis, 77 kInliner, 78 kInstructionSimplifier, 79 kInvariantCodeMotion, 80 kLoadStoreAnalysis, 81 kLoadStoreElimination, 82 kLoopOptimization, 83 kScheduling, 84 kSelectGenerator, 85 kSideEffectsAnalysis, 86 #ifdef ART_ENABLE_CODEGEN_arm 87 kInstructionSimplifierArm, 88 #endif 89 #ifdef ART_ENABLE_CODEGEN_arm64 90 kInstructionSimplifierArm64, 91 #endif 92 #ifdef ART_ENABLE_CODEGEN_mips 93 kPcRelativeFixupsMips, 94 kInstructionSimplifierMips, 95 #endif 96 #ifdef ART_ENABLE_CODEGEN_x86 97 kPcRelativeFixupsX86, 98 kInstructionSimplifierX86, 99 #endif 100 #ifdef ART_ENABLE_CODEGEN_x86_64 101 kInstructionSimplifierX86_64, 102 #endif 103 #if defined(ART_ENABLE_CODEGEN_x86) || defined(ART_ENABLE_CODEGEN_x86_64) 104 kX86MemoryOperandGeneration, 105 #endif 106 kNone, 107 kLast = kNone 108 }; 109 110 // Lookup name of optimization pass. 111 const char* OptimizationPassName(OptimizationPass pass); 112 113 // Lookup optimization pass by name. 114 OptimizationPass OptimizationPassByName(const std::string& pass_name); 115 116 // Optimization definition consisting of an optimization pass 117 // an optional alternative name (nullptr denotes default), and 118 // an optional pass dependence (kNone denotes no dependence). 119 struct OptimizationDef { OptimizationDefOptimizationDef120 OptimizationDef(OptimizationPass p, const char* pn, OptimizationPass d) 121 : pass(p), pass_name(pn), depends_on(d) {} 122 OptimizationPass pass; 123 const char* pass_name; 124 OptimizationPass depends_on; 125 }; 126 127 // Helper method for optimization definition array entries. 128 inline OptimizationDef OptDef(OptimizationPass pass, 129 const char* pass_name = nullptr, 130 OptimizationPass depends_on = OptimizationPass::kNone) { 131 return OptimizationDef(pass, pass_name, depends_on); 132 } 133 134 // Helper method to construct series of optimization passes. 135 // The array should consist of the requested optimizations 136 // and optional alternative names for repeated passes. 137 // Example: 138 // { OptPass(kConstantFolding), 139 // OptPass(Inliner), 140 // OptPass(kConstantFolding, "constant_folding$after_inlining") 141 // } 142 ArenaVector<HOptimization*> ConstructOptimizations( 143 const OptimizationDef definitions[], 144 size_t length, 145 ArenaAllocator* allocator, 146 HGraph* graph, 147 OptimizingCompilerStats* stats, 148 CodeGenerator* codegen, 149 const DexCompilationUnit& dex_compilation_unit, 150 VariableSizedHandleScope* handles); 151 152 } // namespace art 153 154 #endif // ART_COMPILER_OPTIMIZING_OPTIMIZATION_H_ 155