Instrumentation of code having predicated branch-call and...

Details Instrumentation of code having predicated branch-call and... Instrumentation of code having predicated branch-call and...

2005-08-16

2005-08-16

Chaki, Kakali (Department: 2193)

Data processing: software development, installation, and managem

Software program development tool

Testing or debugging

C717S140000

Reexamination Certificate

active

06931632

ABSTRACT:
Method and apparatus for instrumentation of an executable computer program that includes a predicated branch-call instruction followed by a call-shadow instruction. The predicated branch-call instruction and the call-shadow instruction is stored in a first bundle of instructions, which is followed by a second bundle. The predicated branch-call instruction is changed to a predicated branch instruction that targets a fifth bundle of instructions, and the predicate of the predicated branch instruction is the same as the predicate of the predicated branch-call instruction. Third, fourth, and fifth bundles are created to preserve program semantics. The third bundle is inserted following the first bundle and includes the call-shadow instruction. The fourth bundle is inserted following the third bundle and includes a branch instruction that targets the second bundle. The fifth bundle is inserted following the fourth bundle and includes a branch-call instruction that has a target address equal to the target address of the predicated branch-call instruction. Instrumentation instructions are then inserted.

REFERENCES:
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Tamches, Miller “Fine-grained dynamic instrumentation of commodity operating system kernels” 1999 AMC Operating Systems Design and Implementation pp. 117-130.

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