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