Throw illegal argument exception when

vm/base_isolate.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_BASE_ISOLATE_H_
 #define VM_BASE_ISOLATE_H_
 
 namespace dart {
 
 class HandleScope;
@@ skipping 62 matching lines @@
 #endif
   }
 
   void DecrementNoGCScopeDepth() {
 #if defined(DEBUG)
     ASSERT(no_gc_scope_depth_ > 0);
     no_gc_scope_depth_ -= 1;
 #endif
   }
 
+  void ResetNoGCScopeDepth() {

[Ivan Posva, 2012/11/13 08:12:46]

As discussed in person we should try to avoid the reset of No*Scope and instead
find a more suitable mechanism.

[siva, 2012/11/13 19:46:54]

Done.

Now a longjmp is done at the point of failure and the
enclosing writer throws the exception.

On 2012/11/13 08:12:46, Ivan Posva wrote:

+#if defined(DEBUG)
+    ASSERT(no_gc_scope_depth_ > 0);
+    no_gc_scope_depth_ = 0;
+#endif
+  }
+
 #if defined(DEBUG)
   static void AssertCurrent(BaseIsolate* isolate);
 #endif
 
  protected:
   BaseIsolate()
       : top_resource_(NULL),
 #if defined(DEBUG)
         current_zone_(NULL),
         top_handle_scope_(NULL),
@@ skipping 15 matching lines @@
   int32_t no_handle_scope_depth_;
   int32_t no_gc_scope_depth_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(BaseIsolate);
 };
 
 }  // namespace dart
 
 #endif  // VM_BASE_ISOLATE_H_