Rethrow exception when swallowing it is not intended.

Source/bindings/v8/V8BindingMacros.h

 /*
  * Copyright (C) 2010 Google Inc. 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
@@ skipping 53 matching lines @@
     {                                              \
         v8::TryCatch block;                        \
         var = (value);                             \
         if (UNLIKELY(block.HasCaught())) {         \
             block.ReThrow();                       \
             return retVal;                         \
         }                                          \
     }
 
 #define TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(var, value, exceptionState) \
-    var = (value);                                                       \
-    if (UNLIKELY(block.HasCaught()))                                     \
-        exceptionState.rethrowV8Exception(block.Exception());            \
-    if (UNLIKELY(exceptionState.throwIfNeeded()))                        \
-        return;
+    var = (value);                                                        \
+    if (UNLIKELY(block.HasCaught() || exceptionState.throwIfNeeded()))    \
+        return;                                                           \
 
-#define TONATIVE_VOID_EXCEPTIONSTATE(type, var, value, exceptionState)    \
-    type var;                                                             \
-    {                                                                     \
-        v8::TryCatch block;                                               \
+#define TONATIVE_VOID_EXCEPTIONSTATE(type, var, value, exceptionState)     \
+    type var;                                                              \
+    {                                                                      \
+        v8::TryCatch block;                                                \
+        V8RethrowTryCatchScope rethrow(block);                             \
         TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(var, value, exceptionState); \
     }
 
 #define TONATIVE_DEFAULT_EXCEPTIONSTATE(type, var, value, exceptionState, retVal) \
-    type var;                                                                 \
-    {                                                                         \
-        v8::TryCatch block;                                                   \
-        var = (value);                                                        \
-        if (UNLIKELY(block.HasCaught()))                                      \
-            exceptionState.rethrowV8Exception(block.Exception());             \
-        if (UNLIKELY(exceptionState.throwIfNeeded()))                         \
-            return retVal;                                                    \
+    type var;                                                                     \
+    {                                                                             \
+        v8::TryCatch block;                                                       \
+        V8RethrowTryCatchScope rethrow(block);                                    \
+        var = (value);                                                            \
+        if (UNLIKELY(block.HasCaught() || exceptionState.throwIfNeeded()))        \
+            return retVal;                                                        \
     }
 
 // type is an instance of class template V8StringResource<>,
 // but Mode argument varies; using type (not Mode) for consistency
 // with other macros and ease of code generation
 #define TOSTRING_VOID(type, var, value) \
     type var(value);                    \
     if (UNLIKELY(!var.prepare()))       \
         return;
 
 #define TOSTRING_VOID_INTERNAL(var, value) \
     var = (value);                         \
     if (UNLIKELY(!var.prepare()))          \
         return;
 
 #define TOSTRING_DEFAULT(type, var, value, retVal) \
     type var(value);                               \
     if (UNLIKELY(!var.prepare()))                  \
         return retVal;
 
 } // namespace WebCore
 
 #endif // V8BindingMacros_h