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      1 /*
      2  * Copyright (C) 2015 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_SHARPENING_H_
     18 #define ART_COMPILER_OPTIMIZING_SHARPENING_H_
     19 
     20 #include "nodes.h"
     21 #include "optimization.h"
     22 
     23 namespace art {
     24 
     25 class CodeGenerator;
     26 class CompilerDriver;
     27 class DexCompilationUnit;
     28 
     29 // Optimization that tries to improve the way we dispatch methods and access types,
     30 // fields, etc. Besides actual method sharpening based on receiver type (for example
     31 // virtual->direct), this includes selecting the best available dispatch for
     32 // invoke-static/-direct based on code generator support.
     33 class HSharpening : public HOptimization {
     34  public:
     35   HSharpening(HGraph* graph,
     36               CodeGenerator* codegen,
     37               CompilerDriver* compiler_driver,
     38               const char* name = kSharpeningPassName)
     39       : HOptimization(graph, name),
     40         codegen_(codegen),
     41         compiler_driver_(compiler_driver) { }
     42 
     43   void Run() OVERRIDE;
     44 
     45   static constexpr const char* kSharpeningPassName = "sharpening";
     46 
     47   // Used by the builder.
     48   static void ProcessLoadString(HLoadString* load_string,
     49                                 CodeGenerator* codegen,
     50                                 CompilerDriver* compiler_driver,
     51                                 const DexCompilationUnit& dex_compilation_unit,
     52                                 VariableSizedHandleScope* handles);
     53 
     54   // Used by the builder and the inliner.
     55   static HLoadClass::LoadKind ComputeLoadClassKind(HLoadClass* load_class,
     56                                                    CodeGenerator* codegen,
     57                                                    CompilerDriver* compiler_driver,
     58                                                    const DexCompilationUnit& dex_compilation_unit)
     59       REQUIRES_SHARED(Locks::mutator_lock_);
     60 
     61   // Used by Sharpening and InstructionSimplifier.
     62   static void SharpenInvokeStaticOrDirect(HInvokeStaticOrDirect* invoke,
     63                                           CodeGenerator* codegen,
     64                                           CompilerDriver* compiler_driver);
     65 
     66  private:
     67   CodeGenerator* codegen_;
     68   CompilerDriver* compiler_driver_;
     69 };
     70 
     71 }  // namespace art
     72 
     73 #endif  // ART_COMPILER_OPTIMIZING_SHARPENING_H_
     74