Hi Austin,
Sorry to see that nobody has answered your email. I'm not sure what you
are trying to do though. Are you trying to make KLEE choose a specific
size?
(That code is a bit broken, btw. We fixed it in some extensions but
haven't managed to merge the changes into the mainline yet.)
Best,
Cristian
On 18/04/2022 10:55, Wang Austin wrote:
Hello klee-dev members,
I'm working on a project involving KLEE and SMT solvers. We are
collecting queries from KLEE using the v2.2 klee docker image with the
"--use-query-log=solver:smt2" option. I observed that the queries
collected are not always complete when KLEE dealing with malloc(), and
KLEE would throw an error:
...
KLEE: ERROR: tif_unix.c:334: concretized symbolic size
...
I'm expecting to determine the concretized size for malloc() in
accordance with the value of size in the actual execution and check if
the queries are more complete in this case.
I checked the source code (klee/lib/Core/Executor.cpp), finding that
KLEE would "optimize" when the size is symbolized. And I tried the
"--allocate-determ" option for memory management according to the
document, which I thought would determine the size to a specific value
and resolve the error, whereas, it doesn’t seem to be running right,
here are the results.
1) Normal execution:
...
KLEE: ERROR: tif_unix.c:334: concretized symbolic size
KLEE: NOTE: now ignoring this error at this location
KLEE: seeding done (0 states remain)
...
2) Execution with --allocate-determ=1 --allocate-determ-size=10:
...
KLEE: ERROR: tif_unix.c:334: concretized symbolic size
KLEE: NOTE: now ignoring this error at this location
KLEE: seeding done (0 states remain)
KLEE: Deterministic memory allocation starting frow 0x7ff30000000
...
The size still got concretized or perhaps I misunderstood the usage of
the "--allocate-determ" option.
I’m wondering if there is a way to "determine the concretized size to a
specific value when malloc()" or "NOT to optimize the size", so I can
collect queries with more completeness using KLEE.
Best Regards,
Austin Wang
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