Introduce exception object and remove some uses of MaybeObject::IsFailure().

src/objects-inl.h

 // Copyright 2012 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 982 matching lines @@
 bool Object::IsNull() {
   return IsOddball() && Oddball::cast(this)->kind() == Oddball::kNull;
 }
 
 
 bool Object::IsTheHole() {
   return IsOddball() && Oddball::cast(this)->kind() == Oddball::kTheHole;
 }
 
 
+bool Object::IsException() {
+  return IsOddball() && Oddball::cast(this)->kind() == Oddball::kException;
+}
+
+
 bool Object::IsUninitialized() {
   return IsOddball() && Oddball::cast(this)->kind() == Oddball::kUninitialized;
 }
 
 
 bool Object::IsTrue() {
   return IsOddball() && Oddball::cast(this)->kind() == Oddball::kTrue;
 }
 
 
@@ skipping 26 matching lines @@
     double value = Handle<HeapNumber>::cast(object)->value();
     int int_value = FastD2I(value);
     if (value == FastI2D(int_value) && Smi::IsValid(int_value)) {
       return handle(Smi::FromInt(int_value), isolate);
     }
   }
   return Handle<Object>();
 }
 
 
-// TODO(ishell): Use handlified version instead.
-MaybeObject* Object::ToSmi() {
-  if (IsSmi()) return this;
-  if (IsHeapNumber()) {
-    double value = HeapNumber::cast(this)->value();
-    int int_value = FastD2I(value);
-    if (value == FastI2D(int_value) && Smi::IsValid(int_value)) {
-      return Smi::FromInt(int_value);
-    }
-  }
-  return Failure::Exception();
-}
-
-
 MaybeHandle<JSReceiver> Object::ToObject(Isolate* isolate,
                                          Handle<Object> object) {
   return ToObject(
       isolate, object, handle(isolate->context()->native_context(), isolate));
 }
 
 
 bool Object::HasSpecificClassOf(String* name) {
   return this->IsJSObject() && (JSObject::cast(this)->class_name() == name);
 }
@@ skipping 5907 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_