Make Failure inherit from MaybeObject instead of Object.

src/objects-debug.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 22 matching lines @@
 #include "objects-visiting.h"
 
 namespace v8 {
 namespace internal {
 
 #ifdef DEBUG
 
 static const char* TypeToString(InstanceType type);
 
 
-void Object::Print() {
-  if (IsSmi()) {
-    Smi::cast(this)->SmiPrint();
-  } else if (IsFailure()) {
+void MaybeObject::Print() {
+  Object* this_as_object;
+  if (ToObject(&this_as_object)) {
+    if (this_as_object->IsSmi()) {
+      Smi::cast(this_as_object)->SmiPrint();
+    } else {
+      HeapObject::cast(this_as_object)->HeapObjectPrint();
+    }
+  } else {
     Failure::cast(this)->FailurePrint();
-  } else {
-    HeapObject::cast(this)->HeapObjectPrint();
   }
   Flush();
 }
 
 
-void Object::PrintLn() {
+void MaybeObject::PrintLn() {
   Print();
   PrintF("\n");
 }
 
 
-void Object::Verify() {
-  if (IsSmi()) {
-    Smi::cast(this)->SmiVerify();
-  } else if (IsFailure()) {
+void MaybeObject::Verify() {
+  Object* this_as_object;
+  if (ToObject(&this_as_object)) {
+    if (this_as_object->IsSmi()) {
+      Smi::cast(this_as_object)->SmiVerify();
+    } else {
+      HeapObject::cast(this_as_object)->HeapObjectVerify();
+    }
+  } else {
     Failure::cast(this)->FailureVerify();
-  } else {
-    HeapObject::cast(this)->HeapObjectVerify();
   }
 }
 
 
 void Object::VerifyPointer(Object* p) {
   if (p->IsHeapObject()) {
     HeapObject::VerifyHeapPointer(p);
   } else {
     ASSERT(p->IsSmi());
   }
@@ skipping 1309 matching lines @@
         ASSERT(e->IsUndefined());
       }
     }
   }
 }
 
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal