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
10namespace v8 {
11namespace internal {
12namespace compiler {
13
14// Forward declarations.
15class JSGraph;
16class 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.
21class 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