Symbols for type cells.

src/ia32/builtins-ia32.cc

 // 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 455 matching lines @@
     __ cmp(ecx, eax);
     __ j(not_equal, &loop);
 
     // Get the function from the stack and call it.
     // kPointerSize for the receiver.
     __ mov(edi, Operand(esp, eax, times_4, kPointerSize));
 
     // Invoke the code.
     if (is_construct) {
       // No type feedback cell is available
-      Handle<Object> undefined_sentinel(
-          masm->isolate()->heap()->undefined_value(), masm->isolate());
-      __ mov(ebx, Immediate(undefined_sentinel));
+      Handle<Object> megamorphic_sentinel =
+          TypeFeedbackInfo::MegamorphicSentinel(masm->isolate());
+      __ mov(ebx, Immediate(megamorphic_sentinel));
       CallConstructStub stub(NO_CALL_FUNCTION_FLAGS);
       __ CallStub(&stub);
     } else {
       ParameterCount actual(eax);
       __ InvokeFunction(edi, actual, CALL_FUNCTION,
                         NullCallWrapper());
     }
 
     // Exit the internal frame. Notice that this also removes the empty.
     // context and the function left on the stack by the code
@@ skipping 561 matching lines @@
     __ mov(ebx, FieldOperand(edi, JSFunction::kPrototypeOrInitialMapOffset));
     // Will both indicate a NULL and a Smi.
     __ test(ebx, Immediate(kSmiTagMask));
     __ Assert(not_zero, kUnexpectedInitialMapForArrayFunction);
     __ CmpObjectType(ebx, MAP_TYPE, ecx);
     __ Assert(equal, kUnexpectedInitialMapForArrayFunction);
   }
 
   // Run the native code for the Array function called as a normal function.
   // tail call a stub
-  Handle<Object> undefined_sentinel(
-      masm->isolate()->heap()->undefined_value(),
-      masm->isolate());
-  __ mov(ebx, Immediate(undefined_sentinel));
+  Handle<Object> megamorphic_sentinel =
+      TypeFeedbackInfo::MegamorphicSentinel(masm->isolate());
+  __ mov(ebx, Immediate(megamorphic_sentinel));
   ArrayConstructorStub stub(masm->isolate());
   __ TailCallStub(&stub);
 }
 
 
 void Builtins::Generate_StringConstructCode(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- eax                 : number of arguments
   //  -- edi                 : constructor function
   //  -- esp[0]              : return address
@@ skipping 291 matching lines @@
 
   __ bind(&ok);
   __ ret(0);
 }
 
 #undef __
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32