Change the handling of catch blocks to use context extension objects...

src/runtime.cc

 // Copyright 2006-2008 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 197 matching lines @@
   // Copy the elements.
   Object* content = elements->Copy();
   if (content->IsFailure()) return content;
 
   // Set the elements.
   JSArray::cast(object)->SetContent(FixedArray::cast(content));
   return object;
 }
 
 
+static Object* Runtime_CreateCatchExtensionObject(Arguments args) {
+  ASSERT(args.length() == 2);
+  CONVERT_CHECKED(String, key, args[0]);
+  Object* value = args[1];
+  // Create a catch context extension object.
+  JSFunction* constructor =
+      Top::context()->global_context()->context_extension_function();
+  Object* object = Heap::AllocateJSObject(constructor);
+  if (object->IsFailure()) return object;
+  // Assign the exception value to the catch variable and make sure
+  // that the catch variable is DontDelete.
+  value = JSObject::cast(object)->SetProperty(key, value, DONT_DELETE);
+  if (value->IsFailure()) return value;
+  return object;
+}
+
+
 static Object* Runtime_ClassOf(Arguments args) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 1);
   Object* obj = args[0];
   if (!obj->IsJSObject()) return Heap::null_value();
   return JSObject::cast(obj)->class_name();
 }
 
 
 static Object* Runtime_HasStringClass(Arguments args) {
@@ skipping 5716 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage();
   }
 }
 
 
 } }  // namespace v8::internal