Abstract
We present a technique, called binary wrapping , that allows object code routines to be instrumented. Binary wrapping allows tracing to be placed around (and sometimes within) proprietary code, when source code access is difficult or impossible. This technique is based on wrapping user-written code around the object code routine. No modifications are needed to the programs that call the object code routine. Binary wrapping has proven itself invaluable in instrumenting proprietary libraries, and may well be useful in other similar circumstances.
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