Arie Gurfinkel
0035d9b8cb
Background external invariants
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Background external invariants are constraints that are assumed to be
true of the system. This commit introduces a mode in which
background invariants are used only duing inductive generalization
and lemma pushing, but not during predecessor computation.
It is believed that this will be more efficient used of background
external invariants since they will not be able to disturb how
predecessors are generalized and computed.
Based on a patch by Jorge Navas
2018-09-04 21:49:59 -04:00
Arie Gurfinkel
533e9c5837
Expand equality literals when eq_prop is disabled
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When equality propagation is disabled for arithmetic,
equality atoms are expanded into inequality for potentially
better generalization with interpolation
2018-09-04 21:49:59 -04:00
Arie Gurfinkel
6d75c31468
First draft of elim_term_ite xform. Not working.
2018-07-02 17:09:56 -04:00
Arie Gurfinkel
41a05e9d58
Add methods to print pob
2018-06-28 15:38:51 -04:00
Arie Gurfinkel
49e9480928
Fix lemma_as_cti option
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Use negation of a lemma as a proof obligation. This speeds up discovering
bad lemmas that do not contain some reachable states.
2018-06-27 22:49:35 -04:00
Arie Gurfinkel
f6dcc6fc72
API to find pob in pob_manager
2018-06-27 22:49:35 -04:00
Arie Gurfinkel
5bc57238a6
Track whether pob is in pob_queue
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pob_queue is a priority queue. Changing a pob while it is in the queue might change
the priority. This is a source of subtle bugs. The flag is ment to help defend
against this issues in the future.
As a side-effect, a pob that is already in the queue will be silently not added
to it, and a new version of a pob might be created if a version being looked
for is already in the queue.
2018-06-27 22:49:35 -04:00
Arie Gurfinkel
c00c6b4285
Pobs are always managed
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Removed options to allow unmanaged pobs.
Other minor cleanups.
2018-06-27 22:49:35 -04:00
Arie Gurfinkel
1910b4c87c
Rename pobs into pob_manager
2018-06-27 22:49:35 -04:00
Arie Gurfinkel
d9100437ce
Weakness of the lemma independent of the pob
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Lemma inherits its weakness score from the pob. However,
pob's weakness might be reset or changed for some other reason.
To avoid affecting the lemma, the weakness is copied on
construction.
2018-06-27 22:49:35 -04:00
Arie Gurfinkel
4204b6ede2
Switch rest of spacer to new model API and remove mev_util
2018-06-16 14:40:17 -07:00
Arie Gurfinkel
a222b6d41f
Switch reach_fact to new model API
2018-06-16 14:17:33 -07:00
Arie Gurfinkel
f226c6682b
Switched derivation to new model API
2018-06-16 14:09:24 -07:00
Arie Gurfinkel
5e65b37f25
Switch spacer::qe_project to new model API
2018-06-16 13:58:58 -07:00
Arie Gurfinkel
9109968e55
Cleanup fixedpoint options
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Replace pdr options with spacer
Repace fixedpoint module with fp
2018-06-14 16:08:52 -07:00
Arie Gurfinkel
d38879e478
Renamed spacer options
2018-06-14 16:08:52 -07:00
Arie Gurfinkel
8445e2a7a2
Fix bug in weak abs
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Must ensure that weak model makes all summaries true. Otherwise,
it is possible to get stuck discovering the same lemma forever.
2018-06-14 16:08:51 -07:00
Arie Gurfinkel
df7ab0e496
pred_transformer: factor rule bookkeeping to a separate class
2018-06-14 16:08:51 -07:00
Arie Gurfinkel
1f0fd38c99
ground sat refutation from spacer (wip)
2018-06-14 16:08:51 -07:00
Nikolaj Bjorner
c3fb863ad1
formatting/reviewing
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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
2018-06-14 16:08:51 -07:00
Arie Gurfinkel
d2ae3b4025
Create children for pdr in spacer
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This is first working version of gpdr strategy. Passes one test.
2018-06-14 16:08:51 -07:00
Arie Gurfinkel
e1a45671b3
Cleanup spacer options
2018-06-14 16:08:51 -07:00
Arie Gurfinkel
1994f1d7e4
Cleanup of spacer options
2018-06-14 16:08:51 -07:00
Arie Gurfinkel
cb683389f6
spacer::context: Factor params into udpt_params
2018-06-14 16:08:51 -07:00
Arie Gurfinkel
521392a8f1
First partially working pdr strategy in spacer
2018-06-14 16:08:51 -07:00
Arie Gurfinkel
3178f7f86d
Add random order of children in spacer
2018-06-14 16:08:51 -07:00
Arie Gurfinkel
7396ad72ab
Give up when a lemma is re-discovered too many times
2018-06-14 16:08:51 -07:00
Arie Gurfinkel
502e323678
Fixes to pred_tranformer::updt_solver
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
862eef5ec0
Eliminate all existential variables from reach facts
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
70f4674b3a
Code to update solver with all constraints of a pred_transformer
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
cfcc084688
reach_fact --> rf
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
7a8563a34c
spacer: cleaner management of rf tags
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
0b387cd7eb
Moved pool_solvers from spacer::manager into spacer::context
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
451d42319b
Rename m_reach_ctx into m_reach_solver
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
16fefe850a
Factored mbp into pred_transformer and added stats
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
fde58664f6
Moved mk_reach_fact to pred_transformer
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
bfa472faec
New style of json dump based on lemmas at pob
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
5072a2a869
spacer: pobs keep track of their lemmas
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
61cd74818f
Pin lemmas so that they don't disappear
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
56a29093d0
Cleanup transition creation in pred_transformer
2018-06-14 16:08:50 -07:00
Arie Gurfinkel
9c37bef553
Fix bug in ctp
2018-06-14 16:08:49 -07:00
Arie Gurfinkel
55126692c9
spacer: counterexample to pushing (ctp)
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Enable using fixedpoint.spacer.ctp=true
For each lemma L currently at level k, keep a model M that justifies
why L cannot be pushed to (k+1). L is not pushed while the model M
remains valid.
2018-06-14 16:08:49 -07:00
Arie Gurfinkel
95d820196b
Cleanup
2018-06-14 16:08:49 -07:00
Arie Gurfinkel
68b7966254
Use C++11
2018-06-14 16:08:49 -07:00
Arie Gurfinkel
4e9023b8fe
Remove dead code
2018-06-14 16:08:49 -07:00
Arie Gurfinkel
8be03f7c1f
spacer_context: skolemize quant vars before renaming
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Skolemization has to be done before renaming, otherwise,
can't guarantee that variable names do not clash
2018-06-14 16:08:49 -07:00
Arie Gurfinkel
4de58a42fe
Update initialization order
2018-06-14 16:08:49 -07:00
Arie Gurfinkel
aeb2f3c4bb
factor out inherit_properties
2018-06-14 16:08:49 -07:00
Arie Gurfinkel
2f369d8d41
Simplify code using C++11 conventions
2018-06-14 16:08:49 -07:00
Arie Gurfinkel
05c8067392
Changed pob queue management strategy in spacer_context
2018-06-14 16:08:48 -07:00
