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:
HSharpening(HGraph * graph,CodeGenerator * codegen,const DexCompilationUnit & compilation_unit,CompilerDriver * compiler_driver,VariableSizedHandleScope * handles)35   HSharpening(HGraph* graph,
36               CodeGenerator* codegen,
37               const DexCompilationUnit& compilation_unit,
38               CompilerDriver* compiler_driver,
39               VariableSizedHandleScope* handles)
40       : HOptimization(graph, kSharpeningPassName),
41         codegen_(codegen),
42         compilation_unit_(compilation_unit),
43         compiler_driver_(compiler_driver),
44         handles_(handles) { }
45 
46   void Run() OVERRIDE;
47 
48   static constexpr const char* kSharpeningPassName = "sharpening";
49 
50   // Used by the builder and the inliner.
51   static HLoadClass::LoadKind ComputeLoadClassKind(HLoadClass* load_class,
52                                                    CodeGenerator* codegen,
53                                                    CompilerDriver* compiler_driver,
54                                                    const DexCompilationUnit& dex_compilation_unit)
55     REQUIRES_SHARED(Locks::mutator_lock_);
56 
57   // Used by Sharpening and InstructionSimplifier.
58   static void SharpenInvokeStaticOrDirect(HInvokeStaticOrDirect* invoke, CodeGenerator* codegen);
59 
60  private:
61   void ProcessLoadString(HLoadString* load_string);
62 
63   CodeGenerator* codegen_;
64   const DexCompilationUnit& compilation_unit_;
65   CompilerDriver* compiler_driver_;
66   VariableSizedHandleScope* handles_;
67 };
68 
69 }  // namespace art
70 
71 #endif  // ART_COMPILER_OPTIMIZING_SHARPENING_H_
72