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Fixes an unsoundness in unconstrained simplification, fixes #4469.
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Fixes regress1.
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This fixes a soundness issue in strings caused by an incorrect skolem share.
This adds a regression that corresponds to the rewrite that this skolem share was justified by, which is "sat" (the rewrite does not hold). This benchmark in fact was answered "unsat" by CVC4 prior to this PR.
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(#4415)
An incorrect answer of "sat" could be found after 8 seconds on the given benchmark (with --strings-fmf) due to a circular justification for why an extended function was reduced. In particular, we ran checkExtfInference on the same term twice and then marked it as reduced since we had already seen it. This makes the code more conservative.
Notice I'm making the code doubly conservative in case there is any chance for duplication again (e.g. if ExtTheory provides duplicate terms).
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Fixes nightlies.
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This PR merges --lang=smt2.6.1 and --lang=smt2.6 (default). It makes it so that 2.6 always expects the syntax of the string standard http://smtlib.cs.uiowa.edu/theories-UnicodeStrings.shtml.
I've updated the regressions so that the 2.6 benchmarks are now compliant with the standard. Some of the <=2.5 benchmarks I've updated to 2.6. Others I have left for now, in particular the ones that rely on special characters or ad-hoc escape sequences. The old formats will be supported in the release but removed shortly afterwards.
This PR is a prerequisite for the release, but not necessarily SMT-COMP (which will use --lang=smt2.6.1 if needed). Notice that we still do not have parsing support for str.replace_re or str.replace_re_all. This is required to be fully compliant.
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This updates the default cardinality in strings to match the Unicode standard, 196608.
This avoids a check-model failure from 25 benchmarks in SMT-LIB, which were related to a split due to insufficient constants being required during collectModelInfo.
This also makes a few places throw an AlwaysAssert(false) that otherwise would lead to incorrect models. These regardless should never throw, but it would be better to have an assertion failure.
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Fixes #4391.
The sets cardinality cycle rule is analogous to the S-Cycle rule for strings (see Liang et al CAV 2014). This rule is typically never applied but can be applied in rare cases where theory combination does not determine a correct arrangement of equalities over sets terms that is consistent with the arithmetic arrangement of their cardinalities at full effort. Notice the regression from #4391 has non-linear arithmetic, (mod 0 d), which is translated to UF.
The cardinality cycle rule had a bug: it assumed that cycles that were encountered were loops e1 = e2 = ... = e1 but in general they can be lassos e1 = ... = e2 = ... = e2. This ensures the Venn region cycle e2 = ... = e2 is the conclusion in this case, instead of unsoundly concluding e1 = ... = e2.
Strings does not have a similar issue:
https://github.com/CVC4/CVC4/blob/master/src/theory/strings/core_solver.cpp#L488
Here, when a cycle is encountered, it is processed at the point in traversal where the loop is closed.
This is not critical for SMT-COMP but should be in the 1.8 release.
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Fixes #4379. This was caused by a splitting lemma rewriting to a conjunction, being processed as a fact, and having a pending phase requirement sent out assuming the inference was to be processed as a lemma. This forces 2 of the splits in the core solver to be always processed as lemmas.
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This commit converts all v2.5 smt2 regressions to v2.6 (except for regress/regress0/lang_opts_2_5.smt2).
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Fixes #4376. Commit 6255c0356bd78140a9cf075491c1d4608ac27704 removed
support for conjunctions in the conclusion of facts. However,
`F_ENDPOINT_EMP` generates a conjunction in the conclusion of the
inference if multiple components are inferred to be empty. This commit
reinstantiates support for conjunctions in the conclusion of facts.
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This commit addresses issue #38 in cvc4-projects by introducing public API for Sygus commands. It also includes two simple examples of how to use the API.
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This updates option names to be consistent across uses of counterexample-guided quantifier instantiation (ceqgi), which was previously called "counterexample-based quantifier instantiation" (cbqi), and sygus.
Notably, the trace "cegqi-engine" is changed to "sygus-engine" by this commit.
The changes were done by these commands in the given directories:
src/:
for f in $(find -name '.'); do sed -i 's/options::cbqi/options::cegqi/g' $f;sed -i 's/cegqi-engine/sygus-engine/g' $f; done;sed -i 's/"cbqi/"cegqi/g' $f; done
test/regress/:
for f in $(find -name '.'); do sed -i 's/--cbqi/--cegqi/g' $f; done
src/: and test/regress/:
for f in $(find -name '.'); do sed -i 's/cegqi-si/sygus-si/g' $f; done
test/regress/:
for f in $(find -name '.'); do sed -i 's/no-cbqi/no-cegqi/g' $f; done
test/regress/:
for f in $(find -name '.'); do sed -i 's/:cbqi/:cegqi/g' $f; done
And a few minor fixes afterwards.
This should be merged close to the time of the next stable release.
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Should fix the nightlies.
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conflict-based instantiation (#4280)
Conflict-based instantiation would sometimes initialize a match x -> getRepresentative(t) when a quantified formula contained x = t. This leads to issues where getRepresentative(t) is an illegal term (say, in combination with CEGQI). This makes it so the representative is accessed when necessary instead of being set as part of the match.
Fixes #4275.
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Fixes #4277.
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Fixes #4243.
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Fixes #4290 and fixes #4292.
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This adds a fix to ensure dump-unsat-cores-full works by modifying the public options function. This options currently does not work since dumpUnsatCores is only set internally now. This fix is only required until options are refactored so that SmtEngine owns the authoritative copy of options.
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A recent change made it so that defined functions would print as the anonymous lambda corresponding to their definition if the SyGuS v1 parser was used. This was caused by comparison with the wrong kind in the new API.
Notice that the v2 parser does not have this issue.
This also adds a regression to ensure this behavior is maintained by the SyGuS v2 parser.
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Fixes #4273 and fixes #4274 .
This also removes a spurious assertion from the Node::substitute method that the result node is not equal to the domain. This is violated for f(f(x)) { f(x) -> x }.
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Should fix nightlies.
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Sometime you want to skip specific sub-DAGs when traversing a node. For example, you might be doing a transformation with a cache, and want to skip sub-DAGs that you've already processed.
This PR would add a skipIf builder method to NodeDfsIterable, which allows the user to provide a predicate according to which nodes will be omitted from the subsequent traversal.
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Previously we were doing rewriting/expand definitions during grammar normalization, which overwrote the original sygus operators. The connection to the original grammar was maintained via the SygusPrintCallback utility, which ensured that a sygus term printed in a way that matched the grammar.
We now have several use cases where solutions from SyGuS will be directly exported to the user, including the current use of get-abduct. This means that the terms must match the grammar, and we cannot simply rely on the print callback.
This moves the code to normalize sygus operators to datatypes utils, where the conversion between sygus and builtin terms takes place. This allows a version of this function where isExternal = true, which constructs terms matching the original grammar.
This PR enables the SyGuS API to have an accurate getSynthSolution method. It also will eliminate the need for SygusPrintCallback altogether, once the v1 parser is deleted.
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Resource manager will be owned by SmtEngine in the future. This passes the resource manager cached by SmtEnginePrivate to the PropEngine created by SmtEngine instead of using the global pointer. It also makes a few preprocessing passes use the resource manager they already have access to and should use.
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A regress2 SyGuS benchmark is taking 110 seconds in production on my machine. This was likely caused by the recent update v1 -> v2, which impacts the internal representation and hence the search. Disabling for now.
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This PR enables THEORY_UF by default for sets and adds the operator CHOOSE for sets which returns an element from a given set. The semantics is as follows:
If a set A = {x}, then the term (choose A) is equivalent to the term x.
If the set is empty, then (choose A) is an arbitrary value.
If the set has cardinality > 1, then (choose A) will deterministically return an element in A.
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Fixes #3971 and fixes #3991. In incremental mode, the logic can change from one
(check-sat) call to another. In the reported issue, we start with QF_NIA
but then switch to QF_UFNIA because there is a div term (which has a UF in
its expanded form). Dealing with this issue is challenging in general. As a
result, we have decided not to allow theory widening in
Theory::expandDefinitions() anymore but instead to do it eagerly in
SmtEngine::setDefaults().
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A recent commit (45e489e) made it so that dump-models did not automatically enable produce-models in the global options object, but instead the SmtEngine enabled produce-models internally. The code for dump-models and dump-proofs was (perhaps out of paranoia) checking produce-models and produce-proofs. This removes this check, which is the correct thing to do since SmtEngine internally ensures produce-models is set.
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Benchmark recently became slow, disable for now.
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This commit changes the mkkind script to generate a toString()
method for the Kind enum. This method can be used by the
safe_print() function to print statistics if CVC4 has been terminated
before solving a problem. The stats for strings include statistics that
rely on printing kinds (e.g. the number of reductions done of each
kind).
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This commit adds statistics for string rewrites. This is work towards proof
support in the string solver. At a high level, this commit adds a pointer to a
`SequenceStatistics` in the rewriters and modifies
`SequencesRewriter::returnRewrite()` to count the rewrites done. In practice,
to make this work requires a couple of changes, some of them temporary:
- We can't have a single `Rewriter` instance shared between different
`SmtEngine` instances anymore. Thus the `Rewriter` is now owned by the
`SmtEngine` and calling the rewriter retrieves the rewriter associated with
the current `SmtEngine`. This is a temporary workaround before we get rid of
singletons.
- Methods in the `SequencesRewriter` and the `StringsRewriter` are made
non-`static` because they need access to the statistics instance.
- `StringsEntail` now has non-`static` methods because it needs a reference to
the sequences rewriter that it can call.
- The interaction between the `StringsRewriter` and the `SequencesRewriter`
changed: the `StringsRewriter` is now a proper `TheoryRewriter` that inherits
from `SequencesRewriter` and calls its `postRewrite()` before applying its
own rewrites (this is essentially a reversal of roles from before: the
`SequencesRewriter` used to call `static` methods in the `StringsRewriter`).
- The theory rewriters are now owned by the individual theories. This design
mirrors the `EqualityEngine`s owned by the individual theories.
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Fixes #4170.
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This is in preparation for making the strings rewriter configurable for stats.
This moves all utility functions from SequencesRewriter to a proper place. This includes three new groupings of utility functions: those involving arithmetic entailments, those involving string entailments, those involving regular expression entailments. Here, "entailments" loosely means any question regarding a (set of) terms or formulas.
No major code changes. Added some missing documentation and lightly cleaned a few blocks of code in cpp.
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This commit removes aliases that are either undocumented or associated
with uncommon options.
Note: The removal of --statistics, --language, and --output-language may be controversial. The options were undocumented previously and I am in favor of simplifying the options as much as possible, however. Please let me know what you think.
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Until now, the `Rewriter` was responsible for creating `TheoryRewriter`
instances. This commit adds a method `mkTheoryRewriter()` that theories
override to create an instance of their corresponding theory rewriter.
The advantage is that the theories can pass additional information to
their theory rewriter (e.g. a statistics object).
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Towards support for the strings standard.
Adds support to (_ char #x ... ) syntax for characters.
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This renames api::Solver::checkValidAssuming to checkEntailed and
removes api::Solver::checkValid. Internally, SmtEngine::query is renamed
to SmtEngine::checkEntailed, and these changes are further propagated to
the Result class.
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Fixes regress1.
This benchmark is too delicate in the current state.
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Several things have happened with this regression lately, in chronological order:
(1) Instantiations involving bounded set quantifiers were changed to use choice to represent symbolic instantiations,
(2) fmf-bound was decoupled from finite-model-find (the latter is not enabled when the former is),
(3) choice was set to be an "unevaluated" kind (in 0060de3).
After (1) and (2), for the regression test/regress/regress1/fmf/fmf-strange-bounds.smt2, CVC4 was answering "sat" correctly but internally there was a source of incompleteness. In particular, a choice term was being generated in an instantiation that was later incorrectly evaluated, thus allowing CVC4 to skip an instantiation it shouldn't have.
The recent commit of (3) resolved this issue, making it so that choice is not an evaluated kind. This meant the benchmark went "sat" -> "unknown".
This PR fixes this issue by enabling --finite-model-find, which is now necessary to answer "sat".
It also adds a further test quantifier that was used in debugging this issue.
Fixes regress1.
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An option was recently deleted, forgot to disable it from a regression. Fixes a failure in regress1.
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Towards support for the strings standard.
This modifies our interface so that we accept the SMT-LIB standard versions of re.loop and re.^. This means re.loop no longer accepts 3 arguments but 1 (with 2 indices).
This means we no longer accept re.loop with only a lower bound and no upper bound on the number of repetitions.
Also fixes #4161.
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Added the operator choice to Smt2.g and Cvc.g.
Removed the unused parameter hasBoundVars from TheoryModel::getModelValue
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