Make Failure inherit from MaybeObject instead of Object.

src/ic.h

 // Copyright 2006-2009 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 173 matching lines @@
   Address address_;
   IC::UtilityId id_;
 };
 
 
 class CallICBase: public IC {
  protected:
   explicit CallICBase(Code::Kind kind) : IC(EXTRA_CALL_FRAME), kind_(kind) {}
 
  public:
-  Object* LoadFunction(State state, Handle<Object> object, Handle<String> name);
+  MUST_USE_RESULT MaybeObject* LoadFunction(State state,
+                                            Handle<Object> object,
+                                            Handle<String> name);
 
  protected:
   Code::Kind kind_;
 
   // Update the inline cache and the global stub cache based on the
   // lookup result.
   void UpdateCaches(LookupResult* lookup,
                     State state,
                     Handle<Object> object,
                     Handle<String> name);
@@ skipping 23 matching lines @@
   static void GenerateNormal(MacroAssembler* masm, int argc);
 };
 
 
 class KeyedCallIC: public CallICBase {
  public:
   KeyedCallIC() : CallICBase(Code::KEYED_CALL_IC) {
     ASSERT(target()->is_keyed_call_stub());
   }
 
-  Object* LoadFunction(State state, Handle<Object> object, Handle<Object> key);
+  MUST_USE_RESULT MaybeObject* LoadFunction(State state,
+                                            Handle<Object> object,
+                                            Handle<Object> key);
 
   // Code generator routines.
   static void GenerateInitialize(MacroAssembler* masm, int argc) {
     GenerateMiss(masm, argc);
   }
   static void GenerateMiss(MacroAssembler* masm, int argc);
   static void GenerateMegamorphic(MacroAssembler* masm, int argc);
   static void GenerateNormal(MacroAssembler* masm, int argc);
 };
 
 
 class LoadIC: public IC {
  public:
   LoadIC() : IC(NO_EXTRA_FRAME) { ASSERT(target()->is_load_stub()); }
 
-  Object* Load(State state, Handle<Object> object, Handle<String> name);
+  MUST_USE_RESULT MaybeObject* Load(State state,
+                                    Handle<Object> object,
+                                    Handle<String> name);
 
   // Code generator routines.
   static void GenerateInitialize(MacroAssembler* masm) { GenerateMiss(masm); }
   static void GeneratePreMonomorphic(MacroAssembler* masm) {
     GenerateMiss(masm);
   }
   static void GenerateMiss(MacroAssembler* masm);
   static void GenerateMegamorphic(MacroAssembler* masm);
   static void GenerateNormal(MacroAssembler* masm);
 
@@ skipping 39 matching lines @@
                                          bool is_dont_delete);
 
   friend class IC;
 };
 
 
 class KeyedLoadIC: public IC {
  public:
   KeyedLoadIC() : IC(NO_EXTRA_FRAME) { ASSERT(target()->is_keyed_load_stub()); }
 
-  Object* Load(State state, Handle<Object> object, Handle<Object> key);
+  MUST_USE_RESULT MaybeObject* Load(State state,
+                                    Handle<Object> object,
+                                    Handle<Object> key);
 
   // Code generator routines.
   static void GenerateMiss(MacroAssembler* masm);
   static void GenerateRuntimeGetProperty(MacroAssembler* masm);
   static void GenerateInitialize(MacroAssembler* masm) { GenerateMiss(masm); }
   static void GeneratePreMonomorphic(MacroAssembler* masm) {
     GenerateMiss(masm);
   }
   static void GenerateGeneric(MacroAssembler* masm);
   static void GenerateString(MacroAssembler* masm);
@@ skipping 52 matching lines @@
   static bool PatchInlinedLoad(Address address, Object* map);
 
   friend class IC;
 };
 
 
 class StoreIC: public IC {
  public:
   StoreIC() : IC(NO_EXTRA_FRAME) { ASSERT(target()->is_store_stub()); }
 
-  Object* Store(State state,
-                Handle<Object> object,
-                Handle<String> name,
-                Handle<Object> value);
+  MUST_USE_RESULT MaybeObject* Store(State state,
+                                     Handle<Object> object,
+                                     Handle<String> name,
+                                     Handle<Object> value);
 
   // Code generators for stub routines. Only called once at startup.
   static void GenerateInitialize(MacroAssembler* masm) { GenerateMiss(masm); }
   static void GenerateMiss(MacroAssembler* masm);
   static void GenerateMegamorphic(MacroAssembler* masm);
   static void GenerateArrayLength(MacroAssembler* masm);
   static void GenerateNormal(MacroAssembler* masm);
 
   // Clear the use of an inlined version.
   static void ClearInlinedVersion(Address address);
@@ skipping 25 matching lines @@
   static bool PatchInlinedStore(Address address, Object* map, int index);
 
   friend class IC;
 };
 
 
 class KeyedStoreIC: public IC {
  public:
   KeyedStoreIC() : IC(NO_EXTRA_FRAME) { }
 
-  Object* Store(State state,
-                Handle<Object> object,
-                Handle<Object> name,
-                Handle<Object> value);
+  MUST_USE_RESULT MaybeObject* Store(State state,
+                                     Handle<Object> object,
+                                     Handle<Object> name,
+                                     Handle<Object> value);
 
   // Code generators for stub routines.  Only called once at startup.
   static void GenerateInitialize(MacroAssembler* masm) { GenerateMiss(masm); }
   static void GenerateMiss(MacroAssembler* masm);
   static void GenerateRuntimeSetProperty(MacroAssembler* masm);
   static void GenerateGeneric(MacroAssembler* masm);
 
   // Generators for external array types. See objects.h.
   // These are similar to the generic IC; they optimize the case of
   // operating upon external array types but fall back to the runtime
@@ skipping 61 matching lines @@
   static const char* GetName(TypeInfo type_info);
 
   static State ToState(TypeInfo type_info);
 
   static TypeInfo GetTypeInfo(Object* left, Object* right);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IC_H_