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2106 commits

Author SHA1 Message Date
Nikolaj Bjorner
c1b355f342 #6364 
throttle on upwards propagation of default was too restrictive
 2022-10-20 17:48:17 -07:00
Nikolaj Bjorner
6d6752b2aa #6364 2022-10-20 16:39:43 -07:00
Nikolaj Bjorner
5976978062 move std functions up for potential alignment issues 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-10-20 09:11:15 -07:00
Nikolaj Bjorner
fc30461828 unused variables 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-10-20 09:09:06 -07:00
Nikolaj Bjorner
6292b06c67 ensure that initialization order for euf_solver is aligned 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-10-20 08:48:15 -07:00
Nikolaj Bjorner
2842c27e92 #6364 2022-10-20 04:48:13 -07:00
Nikolaj Bjorner
f6595c161f add examples with proof replay 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-10-19 17:43:56 -07:00
Nikolaj Bjorner
b084852397 update release notes, fix bug in replay of Boolean variables in new core 2022-10-19 12:12:32 -07:00
Nikolaj Bjorner
07dd1065db added API to monitor clause inferences 
See RELEASE_NOTES for more information
examples pending.
 2022-10-19 08:34:55 -07:00
Nikolaj Bjorner
77cbd89420 remove once pragma from cpp file 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-10-18 14:57:49 -07:00
Nikolaj Bjorner
cdfab8cb13 wip - add bit-vector validator plugins and logging 2022-10-18 14:50:21 -07:00
Nikolaj Bjorner
f0b85716a9 wip - proof logging fixes 2022-10-18 11:20:56 -07:00
Nikolaj Bjorner
1fc77c8c00 wip - proof checking 
fixes to smt_theory_checker. Generalize it to apply to arrays and fpa.
Missing: bv
 2022-10-18 09:02:50 -07:00
Nikolaj Bjorner
7b3a634b8d wip - features and bug-fixes to proof logging 2022-10-18 07:54:49 -07:00
Nikolaj Bjorner
3bf1b606df remove on-the fly ackerman reduction because it interferes with conflict resolution 2022-10-18 07:53:42 -07:00
Nikolaj Bjorner
b758d5b2b1 wip - proof checking, add support for distinct, other fixes 2022-10-17 17:51:10 -07:00
Nikolaj Bjorner
98fe2e637a add generic theory lemma in default case. 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-10-17 10:17:08 -07:00
Nikolaj Bjorner
a25247aa7b wip - remove stale skaffolding for retrieving sub-hints. 2022-10-16 17:18:08 -07:00
Nikolaj Bjorner
3ed791b16a fix build 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-10-16 15:01:42 -07:00
Nikolaj Bjorner
ac1552d194 wip - updates to proof logging and self-checking 
move self-checking functionality to inside sat/smt so it can be used on-line and not just off-line.

when self-validation fails, use vs, not clause, to check. It allows self-validation without checking and maintaining RUP validation.

new options sat.smt.proof.check_rup, sat.smt.proof.check for online validation.

z3 sat.smt.proof.check=true sat.euf=true /v:1 sat.smt.proof.check_rup=true /st file.smt2 sat.smt.proof=p.smt2
 2022-10-16 23:33:30 +02:00
Nikolaj Bjorner
993ff40826 fixes to proof logging and checking 2022-10-15 12:42:50 +02:00
Nikolaj Bjorner
4388719848 adjust logging 2022-10-14 18:56:18 +02:00
Nikolaj Bjorner
e2cfc53c9f #6364 
skip proof hint unless proofs are on
 2022-10-13 15:31:58 +02:00
Nuno Lopes
a7f018aa03 fix compiler warnings 2022-10-12 10:02:21 +01:00
Nikolaj Bjorner
a2e0646eed wip - proof checker 2022-10-12 09:34:49 +02:00
Nikolaj Bjorner
1b3684c9c1 wip - fixes to implied-eq proof hints 2022-10-11 09:54:00 +02:00
Nikolaj Bjorner
ffeb8f4572 wip - tseitin check 
```
(set-option :sat.euf true)
(set-option :sat.smt.proof tseitinproof.smt2)
(set-option :tactic.default_tactic smt)

(declare-const a1 Bool)
(declare-const a2 Bool)
(declare-const a3 Bool)
(declare-const a4 Bool)
(declare-const a5 Bool)
(declare-const a6 Bool)
(declare-const a7 Bool)
(declare-const a8 Bool)
(declare-const a9 Bool)

(declare-const a10 Bool)
(declare-const a11 Bool)
(declare-const a12 Bool)
(declare-const a13 Bool)
(declare-const a14 Bool)
(declare-const a15 Bool)
(declare-const a16 Bool)
(declare-const a17 Bool)
(declare-const a18 Bool)
(declare-const a19 Bool)

(declare-const x1 Bool)
(declare-const x2 Bool)
(declare-const x3 Bool)
(declare-const x4 Bool)
(declare-const x5 Bool)
(declare-const x6 Bool)
(declare-const x7 Bool)
(declare-const x8 Bool)
(declare-const x9 Bool)

(declare-const b1 Int)
(declare-const b2 Int)
(declare-const b3 Int)
(declare-const b4 Int)

(assert (= x1 (and a1 a2)))
(assert (= x2 (or a3 a4)))
(assert (= x3 (=> a5 a6)))
(assert (= x4 (=  a7 a8)))
(assert (= x5 (if a9 a10 a11)))
(assert (= x6 (=> a12 a13)))
(assert (= x7 (xor a1 a2 a3)))
(assert (= x7 (xor a1 a2 a3 a4 a5 (not a6))))
(assert (= x8 (= (ite a1 b1 b2) b3)))
(check-sat)
(exit)

```
 2022-10-11 09:21:36 +02:00
Nikolaj Bjorner
62438da0f5 wip - add xor and non-bool ite tseitin rules 2022-10-11 09:15:18 +02:00
Nikolaj Bjorner
cd8b8b603a tseitin rule checking - wip 
Unit test

```
(set-option :sat.euf true)
(set-option :sat.smt.proof tseitinproof.smt2)

(declare-const a1 Bool)
(declare-const a2 Bool)
(declare-const a3 Bool)
(declare-const a4 Bool)
(declare-const a5 Bool)
(declare-const a6 Bool)
(declare-const a7 Bool)
(declare-const a8 Bool)
(declare-const a9 Bool)

(declare-const a10 Bool)
(declare-const a11 Bool)
(declare-const a12 Bool)
(declare-const a13 Bool)
(declare-const a14 Bool)
(declare-const a15 Bool)
(declare-const a16 Bool)
(declare-const a17 Bool)
(declare-const a18 Bool)
(declare-const a19 Bool)

(declare-const x1 Bool)
(declare-const x2 Bool)
(declare-const x3 Bool)
(declare-const x4 Bool)
(declare-const x5 Bool)
(declare-const x6 Bool)
(declare-const x7 Bool)
(declare-const x8 Bool)
(declare-const x9 Bool)

(assert (= x1 (and a1 a2)))
(assert (= x2 (or a3 a4)))
(assert (= x3 (=> a5 a6)))
(assert (= x4 (=  a7 a8)))
(assert (= x5 (if a9 a10 a11)))
(assert (= x6 (=> a12 a13)))

(check-sat)
```

Output proof

```
(declare-fun a1 () Bool)
(declare-fun a2 () Bool)
(define-const $26 Bool (and a1 a2))
(declare-fun tseitin (Bool Bool) Proof)
(define-const $60 Bool (not $26))
(define-const $61 Proof (tseitin $60 a1))
(infer a1 (not $26) $61)
(define-const $62 Proof (tseitin $60 a2))
(infer a2 (not $26) $62)
(declare-fun tseitin (Bool Bool Bool) Proof)
(define-const $64 Bool (not a2))
(define-const $63 Bool (not a1))
(define-const $65 Proof (tseitin $63 $64 $26))
(infer (not a1) (not a2) $26 $65)
(declare-fun x1 () Bool)
(assume (not x1) $26)
(assume x1 (not $26))
(declare-fun a3 () Bool)
(declare-fun a4 () Bool)
(define-const $31 Bool (or a3 a4))
(define-const $66 Bool (not a3))
(define-const $67 Proof (tseitin $66 $31))
(infer (not a3) $31 $67)
(define-const $68 Bool (not a4))
(define-const $69 Proof (tseitin $68 $31))
(infer (not a4) $31 $69)
(define-const $70 Bool (not $31))
(define-const $71 Proof (tseitin a3 a4 $70))
(infer a3 a4 (not $31) $71)
(declare-fun x2 () Bool)
(assume (not x2) $31)
(assume x2 (not $31))
(declare-fun a6 () Bool)
(declare-fun a5 () Bool)
(define-const $38 Bool (not a5))
(define-const $39 Bool (or a6 $38))
(define-const $72 Bool (not a6))
(define-const $73 Proof (tseitin $72 $39))
(infer (not a6) $39 $73)
(define-const $74 Proof (tseitin a5 $39))
(infer a5 $39 $74)
(define-const $75 Bool (not $39))
(define-const $76 Proof (tseitin a6 $38 $75))
(infer a6 (not a5) (not $39) $76)
(declare-fun x3 () Bool)
(assume (not x3) $39)
(assume x3 (not $39))
(declare-fun a7 () Bool)
(declare-fun a8 () Bool)
(define-const $44 Bool (= a7 a8))
(define-const $78 Bool (not a7))
(define-const $77 Bool (not $44))
(define-const $79 Proof (tseitin $77 a8 $78))
(infer (not a7) a8 (not $44) $79)
(define-const $80 Bool (not a8))
(define-const $81 Proof (tseitin $77 $80 a7))
(infer a7 (not a8) (not $44) $81)
(define-const $82 Proof (tseitin $44 a8 a7))
(infer a7 a8 $44 $82)
(define-const $83 Proof (tseitin $44 $80 $78))
(infer (not a7) (not a8) $44 $83)
(declare-fun x4 () Bool)
(assume (not x4) $44)
(assume x4 (not $44))
(declare-fun a9 () Bool)
(declare-fun a10 () Bool)
(declare-fun a11 () Bool)
(define-const $50 Bool (ite a9 a10 a11))
(define-const $85 Bool (not a9))
(define-const $84 Bool (not $50))
(define-const $86 Proof (tseitin $84 $85 a10))
(infer (not a9) a10 (not $50) $86)
(define-const $87 Proof (tseitin $84 a9 a11))
(infer a9 a11 (not $50) $87)
(define-const $88 Bool (not a10))
(define-const $89 Proof (tseitin $50 $85 $88))
(infer (not a9) (not a10) $50 $89)
(define-const $90 Bool (not a11))
(define-const $91 Proof (tseitin $50 a9 $90))
(infer a9 (not a11) $50 $91)
(define-const $92 Proof (tseitin $88 $90 $50))
(infer (not a10) (not a11) $50 $92)
(define-const $93 Proof (tseitin a10 a11 $84))
(infer a10 a11 (not $50) $93)
(declare-fun x5 () Bool)
(assume (not x5) $50)
(assume x5 (not $50))
(declare-fun a13 () Bool)
(declare-fun a12 () Bool)
(define-const $57 Bool (not a12))
(define-const $58 Bool (or a13 $57))
(define-const $94 Bool (not a13))
(define-const $95 Proof (tseitin $94 $58))
(infer (not a13) $58 $95)
(define-const $96 Proof (tseitin a12 $58))
(infer a12 $58 $96)
(define-const $97 Bool (not $58))
(define-const $98 Proof (tseitin a13 $57 $97))
(infer a13 (not a12) (not $58) $98)
(declare-fun x6 () Bool)
(assume (not x6) $58)
(assume x6 (not $58))

```
 2022-10-10 23:44:03 +02:00
Nikolaj Bjorner
fceedf60dc wip - proofs 2022-10-10 16:41:09 +02:00
Nikolaj Bjorner
de69874076 wip - adding proof checkers, fixes to quantifier proof certificates 2022-10-10 09:46:22 +02:00
Nikolaj Bjorner
4623117af8 wip - proof hints 2022-10-08 20:12:57 +02:00
Nikolaj Bjorner
6796ea7e49 add new files 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-10-07 19:22:36 +02:00
Nikolaj Bjorner
35639c5ac0 adding q proof hints 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-10-07 19:21:21 +02:00
Nikolaj Bjorner
5c9f69829b fixes to trim 2022-10-07 09:58:12 +02:00
Nikolaj Bjorner
9f78a96c1d wip - trim 2022-10-06 18:19:03 +02:00
Nikolaj Bjorner
4e780d0cc8 trim 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-10-05 05:43:48 +02:00
Nikolaj Bjorner
f8ca692dee fixes to trim 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-10-05 04:32:00 +02:00
Nikolaj Bjorner
c1c659dc93 trying trim 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-10-04 16:25:40 +02:00
Naxaes
49ebca6c1c
Fix clang build (#6378) 2022-10-01 14:01:36 +01:00
Nikolaj Bjorner
ab045f0645 fix build 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-09-30 16:52:19 -04:00
Nikolaj Bjorner
b9cba82531 work on proof checking 
- add outline of trim routine
- streamline how proof terms are checked and how residue units are extracted.
 2022-09-30 13:04:19 -04:00
Nikolaj Bjorner
107981f099 update proof formats for new core 
- update proof format for quantifier instantiation to track original literals
- update proof replay tools with ability to extract proof object

The formats and features are subject to heavy revisions.

Example
```
(set-option :sat.euf true)
(set-option :sat.smt.proof eufproof.smt2)
(declare-fun f (Int) Int)
(declare-const x Int)
(assert (or (= (f (f (f x))) x) (= (f (f x)) x)))
(assert (not (= (f (f (f (f (f (f x)))))) x)))
(check-sat)
```

eufproof.smt2 is:
```
(declare-fun x () Int)
(declare-fun f (Int) Int)
(define-const $24 Int (f x))
(define-const $25 Int (f $24))
(define-const $26 Int (f $25))
(define-const $27 Bool (= $26 x))
(define-const $28 Bool (= $25 x))
(assume $27 $28)
(define-const $30 Int (f $26))
(define-const $31 Int (f $30))
(define-const $32 Int (f $31))
(define-const $33 Bool (= $32 x))
(assume (not $33))
(declare-fun rup () Proof)
(infer (not $33) rup)
(declare-fun euf (Bool Bool Proof Proof Proof Proof) Proof)
(declare-fun cc (Bool) Proof)
(define-const $42 Bool (= $32 $30))
(define-const $43 Proof (cc $42))
(define-const $40 Bool (= $31 $24))
(define-const $41 Proof (cc $40))
(define-const $38 Bool (= $30 $25))
(define-const $39 Proof (cc $38))
(define-const $36 Bool (= $24 $26))
(define-const $37 Proof (cc $36))
(define-const $34 Bool (not $33))
(define-const $44 Proof (euf $34 $28 $37 $39 $41 $43))
(infer (not $28) $33 $44)
(infer (not $28) rup)
(infer $27 rup)
(declare-fun euf (Bool Bool Proof Proof Proof) Proof)
(define-const $49 Bool (= $32 $26))
(define-const $50 Proof (cc $49))
(define-const $47 Bool (= $31 $25))
(define-const $48 Proof (cc $47))
(define-const $45 Bool (= $24 $30))
(define-const $46 Proof (cc $45))
(define-const $51 Proof (euf $34 $27 $46 $48 $50))
(infer $33 $51)
(infer rup)
```

Example of inspecting proof from Python:

```
from z3 import *

def parse(file):
    s = Solver()
    set_option("solver.proof.save", True)
    set_option("solver.proof.check", False)
    s.from_file(file)
    for step in s.proof().children():
        print(step)

parse("../eufproof.smt2")
```

Proof checking (self-validation) is on by default.
Proof saving is off by default.

You can use the proof logs and the proof terms to retrieve quantifier instantiations from the new core.

The self-checker contains a few built-in tuned checkers but falls back to self-checking inferred clauses using SMT.
 2022-09-28 10:40:43 -07:00
Nikolaj Bjorner
3df8b9c7e2 Merge branch 'master' of https://github.com/z3prover/z3 2022-09-25 18:03:26 -07:00
Nikolaj Bjorner
d7b9cc70d0 smc 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-09-25 18:03:16 -07:00
Nikolaj Bjorner
9be8fc7857 Add EUF (congruence closure) proof hints and checker to the new core 
EUF proofs are checked modulo union-find.
Equalities are added to to union-find if they are assumptions or if they can be derived using congruence closure. The congruence closure assumptions are added as proof-hints.
Note that this proof format does not track equality inferences, symmetry and transitivity. Instead they are handled by assuming a union-find based checker.
 2022-09-25 14:26:20 -07:00
Nikolaj Bjorner
6f2fde87d1 move has-default up before merge of parents 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2022-09-24 14:40:30 -07:00
Nikolaj Bjorner
3dfff3d7a1 tracing for fpa 2022-09-23 22:48:54 -07:00
Nikolaj Bjorner
1f150ecd52 #6319 
#6319 - fix incompleteness in propagation of default to all array terms in the equivalence class.

Fix bug with q_mbi where domain restrictions are not using values because the current model does not evaluate certain bound variables to values. Set model completion when adding these bound variables to the model to ensure their values are not missed.

Add better propagation of diagnostics when tactics and the new solver return unknown. The reason for unknown can now be traced to what theory was culprit (currently no additional information)
 2022-09-23 22:22:34 -05:00
Nikolaj Bjorner
6226875283 fix regression with uninitialized variable 2022-09-23 15:51:26 -05:00