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#!/usr/bin/stap
global var%, varerr
probe $1 {
if (@defined($2)) {
try {
newvar = $2;
if (var[tid()] != newvar) {
printf("%s[%d] %s %s:\n", execname(), tid(), pp(), @2);
println(newvar);
var[tid()] = newvar;
}
} catch { varerr ++ } # error during $2 resolution or perhaps var[] assignment
}
}
probe error,end {
if (varerr) printf("%s %s access errors: %d", @1, @2, varerr);
}