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      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_INSTRUCTION_SIMPLIFIER_H_
     18 #define ART_COMPILER_OPTIMIZING_INSTRUCTION_SIMPLIFIER_H_
     19 
     20 #include "nodes.h"
     21 #include "optimization.h"
     22 #include "optimizing_compiler_stats.h"
     23 
     24 namespace art {
     25 
     26 class CodeGenerator;
     27 class CompilerDriver;
     28 
     29 /**
     30  * Implements optimizations specific to each instruction.
     31  *
     32  * Note that graph simplifications producing a constant should be
     33  * implemented in art::HConstantFolding, while graph simplifications
     34  * not producing constants should be implemented in
     35  * art::InstructionSimplifier.  (This convention is a choice that was
     36  * made during the development of these parts of the compiler and is
     37  * not bound by any technical requirement.)
     38  */
     39 class InstructionSimplifier : public HOptimization {
     40  public:
     41   InstructionSimplifier(HGraph* graph,
     42                         CodeGenerator* codegen,
     43                         CompilerDriver* compiler_driver,
     44                         OptimizingCompilerStats* stats = nullptr,
     45                         const char* name = kInstructionSimplifierPassName)
     46       : HOptimization(graph, name, stats),
     47         codegen_(codegen),
     48         compiler_driver_(compiler_driver) {}
     49 
     50   static constexpr const char* kInstructionSimplifierPassName = "instruction_simplifier";
     51 
     52   void Run() OVERRIDE;
     53 
     54  private:
     55   CodeGenerator* codegen_;
     56   CompilerDriver* compiler_driver_;
     57 
     58   DISALLOW_COPY_AND_ASSIGN(InstructionSimplifier);
     59 };
     60 
     61 }  // namespace art
     62 
     63 #endif  // ART_COMPILER_OPTIMIZING_INSTRUCTION_SIMPLIFIER_H_
     64