Debugger: do not expose global object.

src/runtime/runtime-debug.cc

 // Copyright 2014 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.
 
 #include "src/v8.h"
 
 #include "src/arguments.h"
 #include "src/debug/debug.h"
 #include "src/debug/debug-evaluate.h"
 #include "src/debug/debug-frames.h"
@@ skipping 1381 matching lines @@
         if (!instance_filter->IsUndefined()) {
           for (PrototypeIterator iter(isolate, obj); !iter.IsAtEnd();
                iter.Advance()) {
             if (iter.GetCurrent() == instance_filter) {
               obj = NULL;  // Don't add this object.
               break;
             }
           }
         }
 
+        // Do not expose the global object directly.
+        if (obj->IsJSGlobalObject()) {
+          obj = JSGlobalObject::cast(obj)->global_proxy();
+        }
+
         if (obj != NULL) {
           // Valid reference found add to instance array if supplied an update
           // count.
           if (instances != NULL && count < instances_size) {
             instances->set(count, obj);
           }
           last = obj;
           count++;
         }
       }
@@ skipping 410 matching lines @@
   return *isolate->factory()->undefined_value();
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 }  // namespace internal
 }  // namespace v8