Support for global var shortcuts in script contexts.

src/contexts.h

 // Copyright 2012 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_CONTEXTS_H_
 #define V8_CONTEXTS_H_
 
 #include "src/heap/heap.h"
 #include "src/objects.h"
 
@@ skipping 208 matching lines @@
   // Conversions.
   static ScriptContextTable* cast(Object* context) {
     DCHECK(context->IsScriptContextTable());
     return reinterpret_cast<ScriptContextTable*>(context);
   }
 
   struct LookupResult {
     int context_index;
     int slot_index;
     VariableMode mode;
+    VariableLocation location;
     InitializationFlag init_flag;
     MaybeAssignedFlag maybe_assigned_flag;
   };
 
   int used() const { return Smi::cast(get(kUsedSlot))->value(); }
 
   void set_used(int used) { set(kUsedSlot, Smi::FromInt(used)); }
 
   static Handle<Context> GetContext(Handle<ScriptContextTable> table, int i) {
     DCHECK(i < table->used());
@@ skipping 312 matching lines @@
   bool IsScriptContext() {
     Map* map = this->map();
     return map == map->GetHeap()->script_context_map();
   }
 
   bool HasSameSecurityTokenAs(Context* that) {
     return this->global_object()->native_context()->security_token() ==
         that->global_object()->native_context()->security_token();
   }
 
+  // Initializes global variable bindings in given script context.
+  void InitializeGlobalSlots();
+
   // A native context holds a list of all functions with optimized code.
   void AddOptimizedFunction(JSFunction* function);
   void RemoveOptimizedFunction(JSFunction* function);
   void SetOptimizedFunctionsListHead(Object* head);
   Object* OptimizedFunctionsListHead();
 
   // The native context also stores a list of all optimized code and a
   // list of all deoptimized code, which are needed by the deoptimizer.
   void AddOptimizedCode(Code* code);
   void SetOptimizedCodeListHead(Object* head);
@@ skipping 93 matching lines @@
   static bool IsBootstrappingOrGlobalObject(Isolate* isolate, Object* object);
 #endif
 
   STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize);
   STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONTEXTS_H_