[turbofan] Split JSGlobalObjectSpecialization into separate class.

src/compiler/js-native-context-specialization.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_JS_NATIVE_CONTEXT_SPECIALIZATION_H_
 #define V8_COMPILER_JS_NATIVE_CONTEXT_SPECIALIZATION_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/access-info.h"
 #include "src/compiler/graph-reducer.h"
-#include "src/compiler/simplified-operator.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class CompilationDependencies;
 class Factory;
 class FeedbackNexus;
 class TypeCache;
 
 
 namespace compiler {
 
 // Forward declarations.
 class CommonOperatorBuilder;
 class JSGraph;
 class JSOperatorBuilder;
 class MachineOperatorBuilder;
+class SimplifiedOperatorBuilder;
 
 
 // Specializes a given JSGraph to a given native context, potentially constant
 // folding some {LoadGlobal} nodes or strength reducing some {StoreGlobal}
 // nodes.  And also specializes {LoadNamed} and {StoreNamed} nodes according
 // to type feedback (if available).
 class JSNativeContextSpecialization final : public AdvancedReducer {
  public:
   // Flags that control the mode of operation.
   enum Flag {
     kNoFlags = 0u,
     kDeoptimizationEnabled = 1u << 0,
   };
   typedef base::Flags<Flag> Flags;
 
   JSNativeContextSpecialization(Editor* editor, JSGraph* jsgraph, Flags flags,
-                                Handle<JSGlobalObject> global_object,
+                                Handle<Context> native_context,
                                 CompilationDependencies* dependencies,
                                 Zone* zone);
 
   Reduction Reduce(Node* node) final;
 
  private:
   Reduction ReduceJSCallFunction(Node* node);
-  Reduction ReduceJSLoadGlobal(Node* node);
-  Reduction ReduceJSStoreGlobal(Node* node);
   Reduction ReduceJSLoadNamed(Node* node);
   Reduction ReduceJSStoreNamed(Node* node);
   Reduction ReduceJSLoadProperty(Node* node);
   Reduction ReduceJSStoreProperty(Node* node);
 
-  Reduction Replace(Node* node, Node* value, Node* effect = nullptr,
-                    Node* control = nullptr) {
-    ReplaceWithValue(node, value, effect, control);
-    return Changed(value);
-  }
-  Reduction Replace(Node* node, Handle<Object> value);
-
   Reduction ReduceElementAccess(Node* node, Node* index, Node* value,
                                 MapHandleList const& receiver_maps,
                                 AccessMode access_mode,
                                 LanguageMode language_mode);
   Reduction ReduceKeyedAccess(Node* node, Node* index, Node* value,
                               FeedbackNexus const& nexus,
                               AccessMode access_mode,
                               LanguageMode language_mode);
   Reduction ReduceNamedAccess(Node* node, Node* value,
                               MapHandleList const& receiver_maps,
                               Handle<Name> name, AccessMode access_mode,
                               LanguageMode language_mode,
                               Node* index = nullptr);
 
-  struct ScriptContextTableLookupResult;
-  bool LookupInScriptContextTable(Handle<Name> name,
-                                  ScriptContextTableLookupResult* result);
-
   // Adds stability dependencies on all prototypes of every class in
   // {receiver_type} up to (and including) the {holder}.
   void AssumePrototypesStable(Type* receiver_type, Handle<JSObject> holder);
 
   // Assuming that {if_projection} is either IfTrue or IfFalse, adds a hint on
   // the dominating Branch that {if_projection} is the unlikely (deferred) case.
   void MarkAsDeferred(Node* if_projection);
 
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }
   Isolate* isolate() const;
   Factory* factory() const;
   CommonOperatorBuilder* common() const;
   JSOperatorBuilder* javascript() const;
   SimplifiedOperatorBuilder* simplified() const;
   MachineOperatorBuilder* machine() const;
   Flags flags() const { return flags_; }
-  Handle<JSGlobalObject> global_object() const { return global_object_; }
   Handle<Context> native_context() const { return native_context_; }
   CompilationDependencies* dependencies() const { return dependencies_; }
   Zone* zone() const { return zone_; }
   AccessInfoFactory& access_info_factory() { return access_info_factory_; }
 
   JSGraph* const jsgraph_;
   Flags const flags_;
-  Handle<JSGlobalObject> global_object_;
   Handle<Context> native_context_;
   CompilationDependencies* const dependencies_;
   Zone* const zone_;
   TypeCache const& type_cache_;
   AccessInfoFactory access_info_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(JSNativeContextSpecialization);
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(JSNativeContextSpecialization::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_NATIVE_CONTEXT_SPECIALIZATION_H_