1. A method implemented on one or more machines for modifying existing object code, the method comprising: adding exit code to said existing object code, said existing object code includes a method; and adding a new entry in an exceptions data store for said existing object code, said new entry points to said exit code, said adding a new entry includes adding said new entry for said method, said new entry indicates a range of indices corresponding to said method, said new entry includes a reference to said exit code and said new entry indicates that said new entry pertains to multiple types of exceptions.