If the analyzed program does not read any memory, or the reading
memory accesses are filtered out in the import step (import-trace -m),
the trace table may hold no entries for the program. This commit
makes sure the SamplingPruner and FESamplingPruner deal properly with
this situation.
Change-Id: I6bb5da23f345fa97cf8ab0b688cce5d00945249a
SumTree::get now non-intrusively picks an element and returns a
reference to it, SumTree::remove removes and returns a copy. The
former is needed for sampling with replacement.
Change-Id: Iefef2fdf0b7df6ea7a9949f2588528ec9e86bb7a
In the sampling step, the --no-weighting switch disables the
equivalence-class weighting by using a weight of one instead of the
equivalence-class size. This is usually not a good idea, and should
only be used for demonstration purposes, or if the fault model
requires weight-less sampling.
Change-Id: Id903d1924c6ecbcd217815aa5ce9271560130071
The --use-known-results switch simulates sampling (with fault
expansion, FESamplingPruner) by reusing results from a previous
campaign covering the full fault space (that used the "basic" pruner).
The pruner only creates entries in the "fspgroup" table that refer to
already existing pilots and corresponding results.
This switch is not for normal Fail* use, but only for experimenting
with the FESamplingPruner.
Change-Id: I1bf561d93f55918d243c5306551a1c6b48027198
The FESamplingPruner implements the fault-expansion variance reduction
technique (FE-VRT) as described in: Smith, D. Todd and Johnson, Barry W. and
Andrianos, Nikos and Profeta, III, Joseph A., "A variance-reduction technique
via fault-expansion for fault-coverage estimation" (1997), 366--374.
Change-Id: I04a0c9bb2622974278bd8c73793e51451119e650
