Adding Functionality To Existing Code At Exits

摘要

New code is added to existing object code in order to add new functionality. For example, a call to start a profiler function can be added at the beginning of a Java method and a call to stop the profiler function can be added at the exits of the Java method. A method may have many different exits. To insure that the profiler process is stopped regardless of which exit is performed, the byte code and exception table are modified.

主权项

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; and adding a new entry in an exceptions data store for said existing object code, said new entry points to said exit code.