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An API for Runtime Code Patching

Computer Science Department, University of Maryland, College Park

Jeffrey K. Hollingsworth

Computer Science Department, University of Maryland, College Park

The authors present a postcompiler program manipulation tool called Dyninst, which provides a C++ class library for program instrumentation. Using this library, it is possible to instrument and modify application programs during execution. A unique feature of this library is that it permits machine-independent binary instrumentation programs to be written. The authors describe the interface that a tool sees when using this library. They also discuss three simple tools built using this interface: a utility to count the number of times a function is called, a program to capture the output of an already running program to a file, and an implementation of conditional breakpoints. For the conditional breakpoint example, the authors show that by using their interface compared with gdb, they are able to execute a program with conditional breakpoints up to 900 times faster.

International Journal of High Performance Computing Applications, Vol. 14, No. 4, 317-329 (2000)
DOI: 10.1177/109434200001400404


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