Detection and Recovery of Endangered Variables Caused by
A. Adl-Tabatabai and T. Gross, "Detection and Recovery of Endangered
Variables Caused by Instruction Scheduling", Proc. SIGPLAN Symp. on
Programming Language Design and Implementation, June, 1993, 13-25.
Instruction scheduling re-orders and interleaves instruction sequences
from different source statements. This impacts the task of a symbolic
debugger, which attempts to present the user a picture of program
execution that matches the source program. At a breakpoint B
, if the value in the run-time location of a variable V
may not correspond to the value the user expects V to have,
then this variable is endangered at B . This paper
describes an approach to detecting and recovering endangered variables
caused by instruction scheduling. We measure the effects of
instruction scheduling on a symbolic debugger's ability to recover
source values at a breakpoint. This paper reports measurements for
three C programs from the SPEC suite and a collection of programs from
the Numerical Recipes, which have been compiled with a variant of a
commercial C compiler.
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