how to make out if code memory exeeded?

how to make out if the codes that we write have crossed the code memory presnet on the chip ? for example i'm using AT89C2051 which has 2K code menory. i need to know if the codes i've written have crossed this limit. is there any provision / settings in KEIL to detecte the same?
kindly hwlp me out. thanx in advance...
regards,
Bala

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