Reporting -1 as the size of an ILLEGAL reference which actually has...

src/codegen-ia32.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 589 matching lines @@
     Load(e);
     __ CallRuntime(Runtime::kThrowReferenceError, 1);
   }
 }
 
 
 void CodeGenerator::UnloadReference(Reference* ref) {
   // Pop a reference from the stack while preserving TOS.
   Comment cmnt(masm_, "[ UnloadReference");
   int size = ref->size();
-  if (size <= 0) {
-    // Do nothing. No popping is necessary.
-  } else if (size == 1) {
+  if (size == 1) {
     frame_->Pop(eax);
     __ mov(frame_->Top(), eax);
-  } else {
+  } else if (size > 1) {
     frame_->Pop(eax);
     frame_->Drop(size);
     frame_->Push(eax);
   }
 }
 
 
 class ToBooleanStub: public CodeStub {
  public:
   ToBooleanStub() { }
@@ skipping 4525 matching lines @@
 
   // Slow-case: Go through the JavaScript implementation.
   __ bind(&slow);
   __ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal