Based on fifo.sby, running both with and without `btor_aig on`, as well as combined with `vcd_sim on` (after an earlier version had issues when using `vcd_sim off`).
Has both pass and fail checks, so should be able to catch any major issues, although it doesn't fully check equivalence.
Assertions show up in the .btor file as 'bad' statements, assuming btor2aiger maintains the same order this should get us the list of assertions in the order they appear in the .aig file.
- Add `btor2aig_yw.py` to wrap btor2aiger calls, splitting the symbol map into a
`.aim` file and building (and approximation of) the `.ywa` file.
- Currently not tracking asserts/assumes in the `.ywa`, and yosys-witness isn't
the biggest fan of the btor2aiger style of unitialised latches. As such, the
latches are declared but the `.yw` output doesn't do anything with them so
it's incomplete. But the vcd output seems fine (for `vcd_sim=on|off`).
- Add a try/except to catch property matching with an incomplete property list.
- Add `-x` flag to `write_btor` call since aiw2yw gets confused without them.
- Includes some TODO reminders for me to fix things, but as far as I can tell it
is working.
Add `btor_aig` option, which uses `model("btor_nomem")` and btor2aiger to generate an aiger file via btor.
Seems to run fine, until it tries to access design_aiger.ywa for trace conversion.
This commit removes an erroneous "if sbyfile" that would turn '-f' into a no-op
for stdin input files. Presumably this check was originally intended to handle
the case of stdin input file and no specified workdir (which uses a temporary
workdir). In the current version the check is redundant for this particular
case. The check is erroneous in the case of stdin input file and a specified
workdir, so we simply remove the check.
The old test tried to find two primes that are 7 apart. It is supposed to time
out after 1 second but on newer hardware the test completes too quickly. This
commit replaces it with a new test that tries to find a non-trivial solution to
the diophantine equation a**3 + b**3 == c**3, which is a lot more difficult.
ABC will sometimes return negative frame numbers when proving by convergence, e.g.
```
engine_0: Proved output 1 in frame -698905656 (converged).
engine_0: Proved output 4 in frame -698905656 (converged).
```
This change fixes these properties being missed and causing the engine status to return UNKNOWN due to `proved_count != len(proved)`.
This adds initial support for an sqlite database that is shared across
multiple tasks of a single SBY file and that can track the status of
individual properties.
The amount of information tracked in the database is currently quite
minimal and depends on the engine and options used. This can be
incrementally extended in the future.
The ways in which the information in the database can be queries is even
more limited for this initial version, consisting of a single '--status'
option which lists all properties and their status.
