Line data    Source code

       1             : // Copyright 2014 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_COMPILER_JS_CONTEXT_SPECIALIZATION_H_
       6             : #define V8_COMPILER_JS_CONTEXT_SPECIALIZATION_H_
       7             : 
       8             : #include "src/compiler/graph-reducer.h"
       9             : 
      10             : namespace v8 {
      11             : namespace internal {
      12             : namespace compiler {
      13             : 
      14             : // Forward declarations.
      15             : class JSGraph;
      16             : class JSOperatorBuilder;
      17             : 
      18             : 
      19             : // Specializes a given JSGraph to a given context, potentially constant folding
      20             : // some {LoadContext} nodes or strength reducing some {StoreContext} nodes.
      21      395343 : class JSContextSpecialization final : public AdvancedReducer {
      22             :  public:
      23             :   JSContextSpecialization(Editor* editor, JSGraph* jsgraph,
      24             :                           MaybeHandle<Context> context,
      25             :                           MaybeHandle<JSFunction> closure)
      26             :       : AdvancedReducer(editor),
      27             :         jsgraph_(jsgraph),
      28             :         context_(context),
      29      395343 :         closure_(closure) {}
      30             : 
      31             :   Reduction Reduce(Node* node) final;
      32             : 
      33             :  private:
      34             :   Reduction ReduceParameter(Node* node);
      35             :   Reduction ReduceJSLoadContext(Node* node);
      36             :   Reduction ReduceJSStoreContext(Node* node);
      37             : 
      38             :   Reduction SimplifyJSStoreContext(Node* node, Node* new_context,
      39             :                                    size_t new_depth);
      40             :   Reduction SimplifyJSLoadContext(Node* node, Node* new_context,
      41             :                                   size_t new_depth);
      42             : 
      43             :   Isolate* isolate() const;
      44             :   JSOperatorBuilder* javascript() const;
      45             :   JSGraph* jsgraph() const { return jsgraph_; }
      46      773125 :   MaybeHandle<Context> context() const { return context_; }
      47      393276 :   MaybeHandle<JSFunction> closure() const { return closure_; }
      48             : 
      49             :   JSGraph* const jsgraph_;
      50             :   MaybeHandle<Context> context_;
      51             :   MaybeHandle<JSFunction> closure_;
      52             : 
      53             :   DISALLOW_COPY_AND_ASSIGN(JSContextSpecialization);
      54             : };
      55             : 
      56             : }  // namespace compiler
      57             : }  // namespace internal
      58             : }  // namespace v8
      59             : 
      60             : #endif  // V8_COMPILER_JS_CONTEXT_SPECIALIZATION_H_