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 class JSContextSpecialization final : public AdvancedReducer {
22  public:
23   JSContextSpecialization(Editor* editor, JSGraph* jsgraph,
24                           MaybeHandle<Context> context)
25       : AdvancedReducer(editor), jsgraph_(jsgraph), context_(context) {}
26 
27   Reduction Reduce(Node* node) final;
28 
29  private:
30   Reduction ReduceJSLoadContext(Node* node);
31   Reduction ReduceJSStoreContext(Node* node);
32 
33   Reduction SimplifyJSStoreContext(Node* node, Node* new_context,
34                                    size_t new_depth);
35   Reduction SimplifyJSLoadContext(Node* node, Node* new_context,
36                                   size_t new_depth);
37 
38   Isolate* isolate() const;
39   JSOperatorBuilder* javascript() const;
40   JSGraph* jsgraph() const { return jsgraph_; }
41   MaybeHandle<Context> context() const { return context_; }
42 
43   JSGraph* const jsgraph_;
44   MaybeHandle<Context> context_;
45 
46   DISALLOW_COPY_AND_ASSIGN(JSContextSpecialization);
47 };
48 
49 }  // namespace compiler
50 }  // namespace internal
51 }  // namespace v8
52 
53 #endif  // V8_COMPILER_JS_CONTEXT_SPECIALIZATION_H_
54