1// Copyright 2015 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_GLOBAL_OBJECT_SPECIALIZATION_H_
6#define V8_COMPILER_JS_GLOBAL_OBJECT_SPECIALIZATION_H_
7
8#include "src/compiler/graph-reducer.h"
9
10namespace v8 {
11namespace internal {
12
13// Forward declarations.
14class CompilationDependencies;
15class TypeCache;
16
17
18namespace compiler {
19
20// Forward declarations.
21class CommonOperatorBuilder;
22class JSGraph;
23class JSOperatorBuilder;
24class SimplifiedOperatorBuilder;
25
26
27// Specializes a given JSGraph to a given global object, potentially constant
28// folding some {JSLoadGlobal} nodes or strength reducing some {JSStoreGlobal}
29// nodes.
30class JSGlobalObjectSpecialization final : public AdvancedReducer {
31 public:
32  JSGlobalObjectSpecialization(Editor* editor, JSGraph* jsgraph,
33                               MaybeHandle<Context> native_context,
34                               CompilationDependencies* dependencies);
35
36  Reduction Reduce(Node* node) final;
37
38 private:
39  Reduction ReduceJSLoadGlobal(Node* node);
40  Reduction ReduceJSStoreGlobal(Node* node);
41
42  // Retrieve the global object from the given {node} if known.
43  MaybeHandle<JSGlobalObject> GetGlobalObject(Node* node);
44
45  struct ScriptContextTableLookupResult;
46  bool LookupInScriptContextTable(Handle<JSGlobalObject> global_object,
47                                  Handle<Name> name,
48                                  ScriptContextTableLookupResult* result);
49
50  Graph* graph() const;
51  JSGraph* jsgraph() const { return jsgraph_; }
52  Isolate* isolate() const;
53  CommonOperatorBuilder* common() const;
54  JSOperatorBuilder* javascript() const;
55  SimplifiedOperatorBuilder* simplified() const;
56  MaybeHandle<Context> native_context() const { return native_context_; }
57  CompilationDependencies* dependencies() const { return dependencies_; }
58
59  JSGraph* const jsgraph_;
60  MaybeHandle<Context> native_context_;
61  CompilationDependencies* const dependencies_;
62  TypeCache const& type_cache_;
63
64  DISALLOW_COPY_AND_ASSIGN(JSGlobalObjectSpecialization);
65};
66
67}  // namespace compiler
68}  // namespace internal
69}  // namespace v8
70
71#endif  // V8_COMPILER_JS_GLOBAL_OBJECT_SPECIALIZATION_H_
72