Introduce global contexts to represent lexical global scope(s).

src/runtime.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 8720 matching lines @@
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_GetConstructorDelegate) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 1);
   RUNTIME_ASSERT(!args[0]->IsJSFunction());
   return *Execution::GetConstructorDelegate(args.at<Object>(0));
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_NewGlobalContext) {
+  NoHandleAllocation ha;
+  ASSERT(args.length() == 2);
+
+  CONVERT_ARG_CHECKED(JSFunction, function, 0);
+  CONVERT_ARG_CHECKED(ScopeInfo, scope_info, 1);
+  Context* result;
+  MaybeObject* maybe_result =
+      isolate->heap()->AllocateGlobalContext(function, scope_info);
+  if (!maybe_result->To(&result)) return maybe_result;
+
+  isolate->set_context(result);
+
+  return result;  // non-failure
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_NewFunctionContext) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 1);
 
   CONVERT_ARG_CHECKED(JSFunction, function, 0);
   int length = function->shared()->scope_info()->ContextLength();
-  Object* result;
-  { MaybeObject* maybe_result =
-        isolate->heap()->AllocateFunctionContext(length, function);
-    if (!maybe_result->ToObject(&result)) return maybe_result;
-  }
+  Context* result;
+  MaybeObject* maybe_result =
+      isolate->heap()->AllocateFunctionContext(length, function);
+  if (!maybe_result->To(&result)) return maybe_result;
 
-  isolate->set_context(Context::cast(result));
+  isolate->set_context(result);
 
   return result;  // non-failure
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_PushWithContext) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 2);
   JSObject* extension_object;
   if (args[0]->IsJSObject()) {
@@ skipping 4954 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal