[turbofan] Enforce native context specialization.

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 28 matching lines @@
   // Flags that control the mode of operation.
   enum Flag {
     kNoFlags = 0u,
     kAccessorInliningEnabled = 1u << 0,
     kBailoutOnUninitialized = 1u << 1,
     kDeoptimizationEnabled = 1u << 2,
   };
   typedef base::Flags<Flag> Flags;
 
   JSNativeContextSpecialization(Editor* editor, JSGraph* jsgraph, Flags flags,
-                                MaybeHandle<Context> native_context,
+                                Handle<Context> native_context,
                                 CompilationDependencies* dependencies,
                                 Zone* zone);
 
   Reduction Reduce(Node* node) final;
 
  private:
   Reduction ReduceJSLoadContext(Node* node);
   Reduction ReduceJSLoadNamed(Node* node);
   Reduction ReduceJSStoreNamed(Node* node);
   Reduction ReduceJSLoadProperty(Node* node);
@@ skipping 36 matching lines @@
     Node* const value_;
     Node* const effect_;
     Node* const control_;
   };
 
   // Construct the appropriate subgraph for property access.
   ValueEffectControl BuildPropertyAccess(Node* receiver, Node* value,
                                          Node* context, Node* frame_state,
                                          Node* effect, Node* control,
                                          Handle<Name> name,
-                                         Handle<Context> native_context,
                                          PropertyAccessInfo const& access_info,
                                          AccessMode access_mode);
 
   // Construct the appropriate subgraph for element access.
-  ValueEffectControl BuildElementAccess(
-      Node* receiver, Node* index, Node* value, Node* effect, Node* control,
-      Handle<Context> native_context, ElementAccessInfo const& access_info,
-      AccessMode access_mode, KeyedAccessStoreMode store_mode);
+  ValueEffectControl BuildElementAccess(Node* receiver, Node* index,
+                                        Node* value, Node* effect,
+                                        Node* control,
+                                        ElementAccessInfo const& access_info,
+                                        AccessMode access_mode,
+                                        KeyedAccessStoreMode store_mode);
 
   // Construct an appropriate map check.
   Node* BuildCheckMaps(Node* receiver, Node* effect, Node* control,
                        std::vector<Handle<Map>> const& maps);
 
   // Construct an appropriate heap object check.
   Node* BuildCheckHeapObject(Node* receiver, Node* effect, Node* control);
 
   // Adds stability dependencies on all prototypes of every class in
   // {receiver_type} up to (and including) the {holder}.
   void AssumePrototypesStable(std::vector<Handle<Map>> const& receiver_maps,
-                              Handle<Context> native_context,
                               Handle<JSObject> holder);
 
   // Checks if we can turn the hole into undefined when loading an element
   // from an object with one of the {receiver_maps}; sets up appropriate
   // code dependencies and might use the array protector cell.
-  bool CanTreatHoleAsUndefined(std::vector<Handle<Map>> const& receiver_maps,
-                               Handle<Context> native_context);
+  bool CanTreatHoleAsUndefined(std::vector<Handle<Map>> const& receiver_maps);
 
   // Extract receiver maps from {nexus} and filter based on {receiver} if
   // possible.
   bool ExtractReceiverMaps(Node* receiver, Node* effect,
                            FeedbackNexus const& nexus,
                            MapHandleList* receiver_maps);
 
   // Try to infer a map for the given {receiver} at the current {effect}.
   // If a map is returned then you can be sure that the {receiver} definitely
   // has the returned map at this point in the program (identified by {effect}).
   MaybeHandle<Map> InferReceiverMap(Node* receiver, Node* effect);
   // Try to infer a root map for the {receiver} independent of the current
   // program location.
   MaybeHandle<Map> InferReceiverRootMap(Node* receiver);
 
-  // Retrieve the native context from the given {node} if known.
-  MaybeHandle<Context> GetNativeContext(Node* node);
-
   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_; }
-  MaybeHandle<Context> native_context() const { return native_context_; }
+  Handle<Context> native_context() const { return native_context_; }
   CompilationDependencies* dependencies() const { return dependencies_; }
   Zone* zone() const { return zone_; }
 
   JSGraph* const jsgraph_;
   Flags const flags_;
-  MaybeHandle<Context> native_context_;
+  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_