[turbofan] Support fast access to the current global object.

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/graph-reducer.h"
 #include "src/deoptimize-reason.h"
@@ skipping 39 matching lines @@
                                 CompilationDependencies* dependencies,
                                 Zone* zone);
 
   Reduction Reduce(Node* node) final;
 
  private:
   Reduction ReduceJSGetSuperConstructor(Node* node);
   Reduction ReduceJSInstanceOf(Node* node);
   Reduction ReduceJSOrdinaryHasInstance(Node* node);
   Reduction ReduceJSLoadContext(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 ReduceJSStoreDataPropertyInLiteral(Node* node);
 
   Reduction ReduceElementAccess(Node* node, Node* index, Node* value,
                                 MapHandleList const& receiver_maps,
                                 AccessMode access_mode,
                                 LanguageMode language_mode,
                                 KeyedAccessStoreMode store_mode);
   template <typename KeyedICNexus>
   Reduction ReduceKeyedAccess(Node* node, Node* index, Node* value,
                               KeyedICNexus const& nexus, AccessMode access_mode,
                               LanguageMode language_mode,
                               KeyedAccessStoreMode store_mode);
   Reduction ReduceNamedAccessFromNexus(Node* node, Node* value,
                                        FeedbackNexus const& nexus,
                                        Handle<Name> name,
                                        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,
                               Handle<TypeFeedbackVector> vector,
                               FeedbackVectorSlot slot, Node* index = nullptr);
+  Reduction ReduceGlobalAccess(Node* node, Node* receiver, Node* value,
+                               Handle<Name> name, AccessMode access_mode);
 
   Reduction ReduceSoftDeoptimize(Node* node, DeoptimizeReason reason);
 
   // A triple of nodes that represents a continuation.
   class ValueEffectControl final {
    public:
     ValueEffectControl(Node* value, Node* effect, Node* control)
         : value_(value), effect_(effect), control_(control) {}
 
     Node* value() const { return value_; }
@@ skipping 52 matching lines @@
   // Try to infer a root map for the {receiver} independent of the current
   // program location.
   MaybeHandle<Map> InferReceiverRootMap(Node* receiver);
 
   ValueEffectControl InlineApiCall(
       Node* receiver, Node* context, Node* target, Node* frame_state,
       Node* parameter, Node* effect, Node* control,
       Handle<SharedFunctionInfo> shared_info,
       Handle<FunctionTemplateInfo> function_template_info);
 
+  // Script context lookup logic.
+  struct ScriptContextTableLookupResult;
+  bool LookupInScriptContextTable(Handle<Name> name,
+                                  ScriptContextTableLookupResult* result);
+
   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<JSGlobalProxy> global_proxy() const { return global_proxy_; }
   Handle<Context> native_context() const { return native_context_; }
   CompilationDependencies* dependencies() const { return dependencies_; }
   Zone* zone() const { return zone_; }
 
   JSGraph* const jsgraph_;
   Flags const flags_;
+  Handle<JSGlobalObject> global_object_;
+  Handle<JSGlobalProxy> global_proxy_;
   Handle<Context> native_context_;
   CompilationDependencies* const dependencies_;
   Zone* const zone_;
   TypeCache const& type_cache_;
 
   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_