Andrew Reynolds [Thu, 9 Apr 2020 18:53:06 +0000 (13:53 -0500)]
Disable slow sygus regression (#4232)
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.
Andrew Reynolds [Thu, 9 Apr 2020 01:26:11 +0000 (20:26 -0500)]
Split ProcessAssertions module from SmtEngine (#4210)
This is a step towards refactoring the SmtEngine. It splits several core components of SmtEnginePrivate to its own independent module, ProcessAssertions which is responsible for applying preprocessing passes , simplification and expand definitions.
The main change involved moving these functions from SmtEnginePrivate to this new class. A few other minor changes were done to make this move:
A few things changed order within processAssertions to allow SmtEnginePrivate-specific things to happen outside of the main scope of processAssertions.
processAssertions had some logic to catch incompatible options and silently disable options. This was moved to setDefaults.
A few data members in SmtEngine were moved to ProcessAssertions.
Two utilities that were sitting in smt_engine.cpp were moved to their own files.
Another refactoring step will be to make ProcessAssertions take only the utilities it needs instead of taking a SmtEngine reference. This requires further detangling of Options.
mudathirmahgoub [Wed, 8 Apr 2020 23:24:16 +0000 (18:24 -0500)]
Added CHOOSE operator for sets (#4211)
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.
Andres Noetzli [Wed, 8 Apr 2020 21:38:09 +0000 (14:38 -0700)]
Perform theory widening eagerly (#4044)
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().
Andrew Reynolds [Wed, 8 Apr 2020 20:24:55 +0000 (15:24 -0500)]
Fix dump models and dump proofs (#4230)
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.
Andrew Reynolds [Wed, 8 Apr 2020 13:50:14 +0000 (08:50 -0500)]
Eliminate call to currentNM within NodeManager (#4227)
Eliminates 2 unintentional calls to the global access function.
Andrew Reynolds [Tue, 7 Apr 2020 03:48:13 +0000 (22:48 -0500)]
Cleanup deprecated quantifiers attribute features (#4215)
Andrew Reynolds [Tue, 7 Apr 2020 01:58:17 +0000 (20:58 -0500)]
Disable slow regression (#4221)
Benchmark recently became slow, disable for now.
Andrew Reynolds [Tue, 7 Apr 2020 00:00:13 +0000 (19:00 -0500)]
Enum for all remaining string inferences (#4220)
Merges the Flat Form inferences enum into Inferences. Adds documentation for (most of) these inferences. Removes the old infrastructure for inferences based on a debug string in InferenceManager.
Andrew Reynolds [Mon, 6 Apr 2020 21:44:01 +0000 (16:44 -0500)]
Remove links field in all toml files (#4201)
This includes:
All options pertaining to SMTEngine are now handled at the top of setDefaults.
smtlibStrict was deleted in favor of a script.
statsEveryQuery enables stats by modifying a public option function. This is a slight hack but this code will likely get refactored as well soon.
A few other changes:
Fix a bug in SMTEngine: defineFunction should finalize options.
Call setDefaults before initilizing the TheoryEngine and ProofManager. This is necessary so that the PROOF(...) macro works earlier during initialization.
The next step will be to remove the links infrastructure for the options infrastructure. This will enable further detangling of our options dependencies.
Andres Noetzli [Mon, 6 Apr 2020 20:56:35 +0000 (13:56 -0700)]
Refactor disequality processing in string solver (#4209)
This commit refactors disequality processing in the core string solver.
It also adds statistics for the inferences and splits in those methods.
No semantic changes intended.
Aina Niemetz [Mon, 6 Apr 2020 20:29:05 +0000 (13:29 -0700)]
New C++ API: Rename Solver::mkTermInternal. (#4217)
This is for consistency with the other helper functions.
Andrew Reynolds [Sun, 5 Apr 2020 20:51:20 +0000 (15:51 -0500)]
Add missing stat for lemmas based on inferences (#4214)
Andres Noetzli [Sun, 5 Apr 2020 16:42:59 +0000 (09:42 -0700)]
Add safe_print() support for Kind enum (#4213)
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).
Andrew Reynolds [Sun, 5 Apr 2020 06:52:37 +0000 (01:52 -0500)]
Type-independent preregistration of empty word (#4205)
Also removes another instance of empty string in TheoryStrings for consistency sake.
Aina Niemetz [Sat, 4 Apr 2020 01:53:41 +0000 (18:53 -0700)]
New C++ API: Remove Op::getSort(). (#4208)
Andres Noetzli [Fri, 3 Apr 2020 21:52:45 +0000 (14:52 -0700)]
Update theory rewriter ownership, add stats to strings (#4202)
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.
Andrew Reynolds [Fri, 3 Apr 2020 18:07:56 +0000 (13:07 -0500)]
Only rewrite lambdas via array representations when constant (#4203)
Fixes #4170.
Andrew Reynolds [Fri, 3 Apr 2020 14:43:12 +0000 (09:43 -0500)]
Split sequences rewriter (#4194)
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.
Andres Noetzli [Thu, 2 Apr 2020 18:59:34 +0000 (11:59 -0700)]
Remove undocumented/uncommon aliases (#4177)
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.
Andrew Reynolds [Thu, 2 Apr 2020 05:01:21 +0000 (00:01 -0500)]
Introduce enums for all string inferences, excluding the core solver (#4195)
Introduce enum values for all calls to sendInference outside of the core solver.
This included some minor refactoring.
Andres Noetzli [Thu, 2 Apr 2020 02:35:25 +0000 (19:35 -0700)]
Initialize theory rewriters in theories (#4197)
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).
Andrew Reynolds [Wed, 1 Apr 2020 05:30:44 +0000 (00:30 -0500)]
Support char smt-lib syntax (#4188)
Towards support for the strings standard.
Adds support to (_ char #x ... ) syntax for characters.
Mathias Preiner [Wed, 1 Apr 2020 04:31:13 +0000 (21:31 -0700)]
Fix install for ANTLR contrib script and CI dependency caching. (#4196)
Aina Niemetz [Wed, 1 Apr 2020 01:12:16 +0000 (18:12 -0700)]
Rename checkValid/query to checkEntailed. (#4191)
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.
Mathias Preiner [Tue, 31 Mar 2020 23:44:03 +0000 (16:44 -0700)]
Switch to GitHub actions for CI (#4190)
Enable CI with GitHub actions, add macOS builds and disable Travis CI.
Andrew Reynolds [Tue, 31 Mar 2020 20:25:01 +0000 (15:25 -0500)]
Fix fmf benchmark (#4193)
Fixes regress1.
This benchmark is too delicate in the current state.
Andrew Reynolds [Tue, 31 Mar 2020 19:27:04 +0000 (14:27 -0500)]
Remove replay and use-theory options and idl (#4186)
Towards disentangling Options / NodeManager / SmtEngine.
This PR removes options --use-theory=NAME and --replay/--replay-log. Both of these options are highly complex, unused, and lead to complications when implementing the way options and our build system work.
The first is motivated by making TheoryEngine use an "alternate" theory, which appears to e.g. make it so that TheoryIdl could entirely replace TheoryArith. I believe this is too heavy handed of a solution: there should a consistent TheoryArith class, and options should be used to enable/disable alternate modules within it.
The second attempts to replay low level decisions from the SAT solver. It is documented as not working (in 1.0). I do not believe this is worth salvaging.
It also removes the solver in src/theory/idl, which cannot be enabled after this commit.
Andrew Reynolds [Tue, 31 Mar 2020 16:49:02 +0000 (11:49 -0500)]
Fix strange bound regression (#4192)
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.
Andrew Reynolds [Tue, 31 Mar 2020 15:07:29 +0000 (10:07 -0500)]
Convert more uses of string-specific functions (#4158)
Towards theory of sequences.
Andrew Reynolds [Tue, 31 Mar 2020 13:39:21 +0000 (08:39 -0500)]
Fixing regressions (#4189)
An option was recently deleted, forgot to disable it from a regression. Fixes a failure in regress1.
Andrew Reynolds [Mon, 30 Mar 2020 23:15:07 +0000 (18:15 -0500)]
Rewrites for all remaining return statements in strings rewriter (#4178)
Towards proofs for string rewrites. All return statements all now associated with an enum value.
An indentation in a block of code changed in rewriteMembership.
Andrew Reynolds [Mon, 30 Mar 2020 21:29:23 +0000 (16:29 -0500)]
Support indexed operators re.loop and re.^ (#4167)
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.
Andrew Reynolds [Mon, 30 Mar 2020 19:52:55 +0000 (14:52 -0500)]
Remove ref skolem datatype option (#4185)
Fixes #4180, fixes CVC4/cvc4-projects#133, fixes CVC4/cvc4-projects#134.
Mathias Preiner [Mon, 30 Mar 2020 18:08:52 +0000 (11:08 -0700)]
Add coverage badge. (#4187)
Coverage information is updated nightly.
Andrew Reynolds [Mon, 30 Mar 2020 15:46:45 +0000 (10:46 -0500)]
Fix arguments to print callback (#4171)
The method applyParseOp may modify the argument vector. In the case of the sygus V1 parser, this argument vector was then being used to set up a print callback, leading to incorrect printing and failures.
Work towards having a working V1 -> V2 conversion for the release.
FYI @abdoo8080
mudathirmahgoub [Mon, 30 Mar 2020 14:04:52 +0000 (09:04 -0500)]
Frontend support for the choice operator (#4175)
Added the operator choice to Smt2.g and Cvc.g.
Removed the unused parameter hasBoundVars from TheoryModel::getModelValue
Andrew Reynolds [Sun, 29 Mar 2020 00:50:35 +0000 (19:50 -0500)]
Enumeration for String rewrites (#4173)
In preparation for string proof infrastructure.
This introduces an enumeration type to track string rewrites.
It also makes inference printing more consistent.
Abdalrhman Mohamed [Sat, 28 Mar 2020 19:31:37 +0000 (14:31 -0500)]
Change is-cons to (_ is cons) in Sygus benchmarks. (#4174)
Abdalrhman Mohamed [Sat, 28 Mar 2020 17:39:47 +0000 (12:39 -0500)]
Convert the last few Sygus benchmarks to V2. (#4172)
Abdalrhman Mohamed [Sat, 28 Mar 2020 16:41:22 +0000 (11:41 -0500)]
Stop printing datatype declaration for Sygus V1 grammar. (#4168)
Alex Ozdemir [Sat, 28 Mar 2020 06:22:41 +0000 (23:22 -0700)]
Node traversal iterator (#3845)
Implement an iterator for pre- and post-order traversals.
I believe that this will be useful in pre-processing passes, many of
which do postorder traversals that they implement by hand.
Right now this iterator does not support modification of the traversal
pattern, but we could add this later on, if we want it.
Co-authored-by: Andres Noetzli <andres.noetzli@gmail.com>
Co-authored-by: Mathias Preiner <mathias.preiner@gmail.com>
Andrew Reynolds [Sat, 28 Mar 2020 00:53:59 +0000 (19:53 -0500)]
Split transcendental solver to its own file (#4156)
* Attempting to split transcendental function solver
* Clean
* Format
* More
* Format
* Attempt link
* Format
* Fix
* Another refactor
* More
* More
* Rename
* Format
Co-authored-by: Ahmed Irfan <43099566+ahmed-irfan@users.noreply.github.com>
Co-authored-by: Aina Niemetz <aina.niemetz@gmail.com>
Andres Noetzli [Fri, 27 Mar 2020 23:37:14 +0000 (16:37 -0700)]
Fix issues with unsat cores and reset-assertions (#4159)
Fixes #4151. Commit
e9f4cec2cad02e270747759223090c16b9d2d44c fixed how
`(reset-assertions)` is handled by destroying and recreating the
`PropEngine` owned by `SmtEngine`. When unsat cores are enabled,
creating a `PropEngine` triggers the creation of a SAT proof and a CNF
proof. In the `ProofManager`, we had assertions that checked that those
kinds of proofs were only created once, which is not true anymore. This
commit removes the assertions, cleans up the memory management in
`ProofManager` to use `std::unique_ptr` and makes all the
`ProofManager::init*` methods non-static for consistency.
The commit also fixes an additional issue that I encountered while
testing the fix: When creating the new `PropEngine`, we were not
asserting `true` and `(not false)`, which lead to an error if we tried
to get the unsat core after a `(reset-assertion)` command and we had
asserted `(assert false)`. The commit fixes this by asserting `true` and
`(not false)` in the constructor of `PropEngine`.
The regression test is an extension of the example in #4151 and covers
both issues.
Andrew Reynolds [Fri, 27 Mar 2020 22:45:30 +0000 (17:45 -0500)]
Fix expected output on arith regression (#4162)
A benchmark went unknown -> sat, likely due to the arith-brab commit, thus leading to a failure on regress1.This updates the status on this benchmark (also adds --nl-ext-tplanes to it).
Andrew Reynolds [Fri, 27 Mar 2020 19:04:44 +0000 (14:04 -0500)]
Move string utility file (#4164)
Moves the string file to string.h. This is required since other required utilities will soon need to be added to regexp.h.
Andrew Reynolds [Fri, 27 Mar 2020 15:23:42 +0000 (10:23 -0500)]
Do not require that function sorts are first class internally (#4128)
This PR removes the requirement in the NodeManager that argument types to the function sort are first class.
Notice that the new API does this check (as it should): https://github.com/CVC4/CVC4/blob/master/src/api/cvc4cpp.cpp#L2633
Moreover, SyGuS v2 internally requires constructing function types having arguments that are not first class (e.g. regular expression type). This is required to update the regression https://github.com/CVC4/CVC4/blob/master/test/regress/regress1/sygus/re-concat.sy to SyGuS v2.
FYI @abdoo8080 .
Andrew Reynolds [Fri, 27 Mar 2020 14:01:38 +0000 (09:01 -0500)]
Support unicode internal representation and escape sequences (#3852)
Work towards support for the strings standard.
This updates the string solver and parser such that:
The internal representation of strings is vectors of code points,
Generation of the previous internal representation of strings has been relegated to the type enumerator. This is the code that ensures that "A" is the first character chosen for values of strings in models,
The previous ad-hoc escape sequence handling is moved from the String class to the parser. It will live there for at least one version of CVC4, until we no longer support non-smt-lib complaint escape sequences or non-printable characters in strings,
Handle unicode escape sequences according to the SMT-LIB standard in String,
Simplify a number of calls to String utility functions, since the conversion between the previous internal format and code points is now unnecessary,
Fixed a bug in the handling of TO_CODE: it should be based on the alphabet cardinality, not the number of internal code points.
Andrew Reynolds [Fri, 27 Mar 2020 04:13:39 +0000 (23:13 -0500)]
Move set defaults function to its own file (#4154)
This moves SmtEngine::setDefaults to its own file.
This design is not final. One could imagine this being a part of a "OptionsSetter" utility. I am leaving this as is until we refactor the relationship between SmtEngine and Options.
Regardless, the general file structure should be such that this method is separate from SmtEngine, since setting default options is a large task that should be addressed independently from the core of SmtEngine.
This is initial preparation towards converting the SmtEngine from Expr -> Node.
A few very minor changes were made to the code to make the separation possible.
Amalee [Thu, 26 Mar 2020 23:32:51 +0000 (16:32 -0700)]
Added unit-cube-like test for branch and bound (#3922)
* unit-cude test wip
* test for wip unit cube test
* fixed simple rounding
* wip
* Passing tests except for sat vs unknown ones
* added flag for cube test
* put example back to normal
* Fixed for style guidelines.
* fixed rewrite bug
* removed extra comments
* unit-cude test wip
* test for wip unit cube test
* fixed simple rounding
* wip
* Passing tests except for sat vs unknown ones
* added flag for cube test
* put example back to normal
* Fixed for style guidelines.
* fixed rewrite bug
* removed extra comments
* Small fixes based on PR feedback
* replace NodeManager::currentNM with nm and clang formatted
* renamed test
* Added a regression test that triggers branch and bound
* Added ; COMMAND-LINE: --arith-brab
* Updated arith-brab test
* arith-brab enabled by default
* Added --nl-ext-tplanes to regress0/nl/ext-rew-aggr-test.smt2
Co-authored-by: Amalee Wilson <amalee@cis.uab.edu>
Co-authored-by: Ahmed Irfan <43099566+ahmed-irfan@users.noreply.github.com>
Co-authored-by: Andrew Reynolds <andrew.j.reynolds@gmail.com>
Andrew Reynolds [Thu, 26 Mar 2020 19:42:49 +0000 (14:42 -0500)]
Disable slow regression (#4157)
Should fix timeout in asan build.
Andrew Reynolds [Thu, 26 Mar 2020 14:52:28 +0000 (09:52 -0500)]
Add stats for string reductions, lemmas and conflicts (#4149)
This PR adds comprehensive stats for reductions, lemmas and conflicts in TheoryStrings. Remaining stats will track all inferences (which are finer grained steps that may lead to lemmas/conflicts).
Additionally this PR refactors calls to OutputChannel::lemma in TheoryStrings / InferenceManager. There are now only 2 calls to lemma(...) during registerTerm(...), one for "atomic" string terms (corresponding to length splits typically) and one for non-atomic terms.
Andrew Reynolds [Thu, 26 Mar 2020 13:37:13 +0000 (08:37 -0500)]
Generalize more string-specific functions (#4152)
Towards theory of sequences.
Note this PR also changes design in core/base solver. Previously I had estimated that we should have separate instances per type for these solvers, but I think it is better to have these classes handle all string-like types simultaneously. This means they should not have a d_type field.
Andrew Reynolds [Thu, 26 Mar 2020 06:38:08 +0000 (01:38 -0500)]
Care graphs based on polymorphic operators in strings (#4150)
Towards theory of sequences.
To compute a care graphs, we need to group function applications by the string type they are associated with. This PR introduces a utility to function to get the "owning string type" for a function application, and updates the care graph computation so that it partitions function applications according to this type.
Andres Noetzli [Wed, 25 Mar 2020 19:22:25 +0000 (12:22 -0700)]
Support async-signal-safe printing of inferences (#4148)
Commit
c9b7c3d introduced code for
counting the number of string inferences done per type of inference.
However, it did not add support for printing the inference names in an
async-signal-safe manner via safe_print() (note that printing in
signal handlers is done differently from the regular stats printing).
This commit adds the corresponding code, s.t. we get the inference names
when printing the stats when CVC4 is interrupted or crashes.
Ahmed Irfan [Wed, 25 Mar 2020 16:37:57 +0000 (09:37 -0700)]
bv2int : linear mult opt (#4142)
Andrew Reynolds [Wed, 25 Mar 2020 13:48:14 +0000 (08:48 -0500)]
Generalize more uses of string-specific functions (#4145)
Towards theory of sequences.
yoni206 [Tue, 24 Mar 2020 17:53:18 +0000 (10:53 -0700)]
Int2BV fail on demand (#4079)
This PR delays error on unsupported symbols as much as possible, by only throwing the error when actually constructing the node.
Andrew Reynolds [Tue, 24 Mar 2020 15:45:55 +0000 (10:45 -0500)]
Restrict partial triggers to standard quantified formulas (#4144)
Fixes #4143.
Andrew Reynolds [Tue, 24 Mar 2020 02:20:32 +0000 (21:20 -0500)]
Restrict cases of sygus grammar reduction based on argument variants (#4131)
An assertion is triggered for some V2 versions of SyGuS V1 benchmarks during sygus grammar reduction. This PR updates this technique so that it only applies to sygus constructors whose sygus operators are lambdas of the form
lambda x1 ... xn. f( x1 ... xn ).
FYI @abdoo8080 .
Andrew Reynolds [Mon, 23 Mar 2020 22:12:56 +0000 (17:12 -0500)]
Infer when sygus operators are equivalent to builtin kinds (#4140)
The V2 parser always turns sygus operators into lambdas for consistency. This PR ensures that we nevertheless infer when a sygus operator is equivalent to a builtin operator, e.g.
(lambda x y. (+ x y)) is equivalent to +.
The main reason this is required is to ensure that solution reconstruction heuristics work optimally when we make the switch SyGuS V1 -> V2 (see 5 failing benchmarks due to --cegqi-si=all on #4136).
Andrew Reynolds [Mon, 23 Mar 2020 19:04:32 +0000 (14:04 -0500)]
Simplify auxiliary variable handling in CEGQI (#4141)
Fixes #3849 and fixes #4062.
Overall, the effect of this PR is that CEGQI will generate better instantiations more frequently for quantified formulas that involve the introduction of auxiliary variables.
In CEGQI, auxiliary variables introduced in CEX lemmas must be given special treatment (since the instantiations should not involve them, thus they must be solved for as well). Previously, auxiliary variables that are introduced as parts of CEX lemmas were currently assumed to be:
(1) Only occurring from ITE removal, e.g. s[(ite C t1 t2]) ---> s[k] ^ ite( C, k = t1, k = t2 )
(2) Always trivially solvable by looking at which literal was asserted (k = t1 or k = t2).
Both of these assumption do not hold in general (aux variables can come from other kinds of terms e.g. choice functions, and the user can force options that rewrite arithmetic equalities to inequalities).
This makes auxiliary variable handling in CEGQI more robust by treating auxiliary variables as standard variables. Effectively, this means that the entire procedure for determining instantiations is run for auxiliary variables. This PR removes the specific hacks that were used previously that were based on the assumptions above.
Additionally, #3849 triggered a second issue: SyGuS solution reconstruction that involves auxiliary variables that are introduced as part of instantiation lemmas should not be considered valid solutions. Previously, only a warning was given.
Andrew Reynolds [Mon, 23 Mar 2020 18:30:48 +0000 (13:30 -0500)]
Throw exception for non-well-founded unimplemented SyGuS types. (#4125)
Fixes #3931.
Currently we print a warning for unimplemented types when constructing default SyGuS grammars. We should additionally throw an exception when the unimplemented type would lead to a non-well-founded datatype.
Andrew Reynolds [Mon, 23 Mar 2020 15:49:46 +0000 (10:49 -0500)]
Change transcendental function app slave list to unordered_set (#4139)
Fixes #4112.
Andres Noetzli [Mon, 23 Mar 2020 04:05:37 +0000 (21:05 -0700)]
Collect statistics about normal form inferences (#4127)
This commit adds code to count the number of inferences made of each
inference type for normal form inferences. It extends the Inference
enum in `infer_info.h` and adds two new `sendInference()` methods in the
`InferenceManager` to send and count inferences that have a corresonding
entry in the `Inference` enum.
Andrew Reynolds [Sun, 22 Mar 2020 14:23:57 +0000 (09:23 -0500)]
Sort inference does not handle APPLY_UF when higher-order is enabled (#4138)
Fixes #4092 and fixes #4134.
Typically, APPLY_UF has special treatment in sort inference. It is significantly more complicated when higher-order logic is enabled. This disables special handling when ufHo() is enabled.
Abdalrhman Mohamed [Sun, 22 Mar 2020 03:33:15 +0000 (22:33 -0500)]
Convert V1 Sygus files to V2. (#4136)
Andres Noetzli [Sat, 21 Mar 2020 19:57:22 +0000 (12:57 -0700)]
Simplify heuristic in `processNEqc` (#4129)
This commit removes a special case in `CoreSolver::processNEqc()` where
we stopped looking for inferences for a given normal form as soon as we
found the highest priority inference (currently that an element in the
normal form is empty). This effectively elevates the priority of this
inference to the other inferences that are done immediately instead of
being added to the `pinfer` vector that holds the possible inferences.
The experiments that I've run seem to confirm that it is unnecessary to
have this special case.
Andres Noetzli [Sat, 21 Mar 2020 03:47:53 +0000 (20:47 -0700)]
Don't run bv_nat parse test with competition build (#4126)
This commit should fix the nightlies.
Andrew Reynolds [Fri, 20 Mar 2020 23:09:27 +0000 (18:09 -0500)]
Generalize mkConcat for types (#4123)
Towards theory of sequences.
The utility function mkConcat needs a type to know what to construct in the empty string case.
Andrew Reynolds [Fri, 20 Mar 2020 22:29:41 +0000 (17:29 -0500)]
Fix variable shadowing issue in sygus-inference (#4121)
This makes the sygus-inference preprocessing pass avoid variable shadowing, which technically could happen by forcing unexpected options.
Fixes #4083.
Andrew Reynolds [Fri, 20 Mar 2020 20:36:35 +0000 (15:36 -0500)]
Fix sort comparison within assertion in cegis (#4113)
Andrew Reynolds [Fri, 20 Mar 2020 19:45:13 +0000 (14:45 -0500)]
Guard cases of sort inference in quantifier free logics in uf cardinality (#4074)
Fixes #4068 and fixes #4085 and fixes #4063.
Andrew Reynolds [Fri, 20 Mar 2020 19:07:37 +0000 (14:07 -0500)]
Split string-specific operators from TheoryStringsRewriter (#3920)
Organization towards theory of sequences.
The motivation of this PR is to ensure that string-specific operators in the rewriter are in their own file; thus the use of mkConst<String> / getConst<String> is allowable in rewriter_str.cpp.
Andrew Reynolds [Fri, 20 Mar 2020 18:18:11 +0000 (13:18 -0500)]
Do not assign higher-order representative if function does not exist (#4073)
Andrew Reynolds [Fri, 20 Mar 2020 17:41:49 +0000 (12:41 -0500)]
Handle failures for sygus QE preprocess (#4072)
If the user explicitly disabled the QE algorithm and asked for QE, then we should resort to normal methods. Fixes #4064 and fixes #4109.
Andrew Reynolds [Fri, 20 Mar 2020 16:04:31 +0000 (11:04 -0500)]
Parse error for SyGuS version 1.0 vs 2.0 (#4057)
This adds a useful error message that recognizes a divergence in the expected input format (version 1 vs. version 2), which will be useful when we switch to SyGuS version 2 by default. This warning message is already potentially useful for users who are using --lang=sygus2.
Andrew Reynolds [Fri, 20 Mar 2020 15:16:21 +0000 (10:16 -0500)]
Make handling of illegal internal representatives in quantifiers engine more robust (#4034)
Fixes #4002 (that benchmark is now unknown).
The experimental option --cbqi-all previously had some issues when combined with finite model finding. When these two options are used simultaneously, it may be the case that certain equivalence classes are "illegal" since they contain only terms that are ineligible for instantiation.
The previous code threw a warning when this occurred which in extreme cases allowed for potentially ineligible terms for instantiation. The new code is more conservative: we never choose illegal internal representatives and instead set the incomplete flag in finite model finding when this occurs.
A block of code changed indentation in this PR, which was updated to the new standards.
Andrew Reynolds [Fri, 20 Mar 2020 14:25:24 +0000 (09:25 -0500)]
Refactor enumerator for strings (#4014)
Towards theory of sequences. This separates out a virtual base class and utility class for the strings enumerator, which will be extended for sequences later.
Andrew Reynolds [Thu, 19 Mar 2020 22:57:42 +0000 (17:57 -0500)]
Fix regression output related to sygus+bv-div-zero (#4122)
yoni206 [Thu, 19 Mar 2020 17:12:10 +0000 (10:12 -0700)]
Bv2int fail on demand
Postpone failure in bv-to-int preprocessing pass.
Andres Noetzli [Thu, 19 Mar 2020 14:18:58 +0000 (07:18 -0700)]
Only apply testConstStringInRegExp to const regexp (#4120)
Fixes #4070. `TheoryStringsRewriter::rewriteConcatRegExp()` rewrites
`(a)* ++ (_)*` to `(_)*`. To do so, it checks whether the elements
preceding `(_)*` match the empty string using
`TheoryStringsRewriter::testConstStringInRegExp()`. However, this method
only expects to be called on constant regular expressions (i.e. regular
expressions without string variables). This commit adds a corresponding
check before calling `TheoryStringsRewriter::testConstStringInRegExp()`.
Andrew Reynolds [Thu, 19 Mar 2020 08:37:26 +0000 (03:37 -0500)]
SyGuS must use total bitvector division (#4119)
Our SyGuS utilities are not designed to deal with partial bitvector division. If a user forced an older version of SMT-LIB semantics while using SyGuS, this led to a number of issues.
For now, we disable this option when it is combined with SyGuS, regardless of whether the user turns it on.
A more permanent solution will be to remove the old SMT-LIB semantics option bv-div-zero-const entirely.
Fixes #4097 and fixes #4088 and fixes #4104.
Andres Noetzli [Thu, 19 Mar 2020 06:46:50 +0000 (23:46 -0700)]
Only allow bv2nat/int2bv with BV and integer logic (#4118)
CVC4 supports `bv2nat` and `int2bv` to convert bit-vectors to/from
integers. Those operators are not standard. This commit only enables
those operators when parsing is non-strict and both bit-vectors and
integers are enabled in the logic. To achieve this, the commit
simplifies the handling of logics in the parser: Instead of defining a
separate `Logic` enum in the `Smt2` class, we simply use `LogicInfo`
directly.
Andrew Reynolds [Thu, 19 Mar 2020 06:01:05 +0000 (01:01 -0500)]
Remove spurious assertion (#4117)
Fixes #4106.
The assertion was the wrong polarity (should have been Assert(options::cbqiAll()); but regardless is no longer an invariant of CEGQI).
Andrew Reynolds [Thu, 19 Mar 2020 04:54:57 +0000 (23:54 -0500)]
Explicitly handle isFinite for rounding modes (#4115)
The function TypeNode::isFinite is designed to compute finiteness without computing cardinality for the sake of efficiency; there was a missing case for rounding modes, leading to an assertion failure.
Fixes #4101.
Andrew Reynolds [Thu, 19 Mar 2020 01:42:55 +0000 (20:42 -0500)]
Always enable cbqi literal dependency (#4116)
Fixes #4105.
It appears that the two (experimental) options in that issue were incompatible.
A block of code changed indentation in this PR and was updated to guidelines.
Andrew Reynolds [Thu, 19 Mar 2020 01:13:27 +0000 (20:13 -0500)]
Fix issue with multiple infinities in CEGQI for LIRA (#4114)
Fixes #4086.
Quantifier instantiation involves two symbolic representations of infinities for real and int and was not handled correctly previously.
Alex Ozdemir [Wed, 18 Mar 2020 21:30:30 +0000 (14:30 -0700)]
Move node visitor class from smt_util/ to expr/ (#4110)
Done by:
Running rg 'smt_util/node_visitor' -l | xargs sed -i 's/smt_util\/node_visitor/expr\/node_visitor/' in src to change the #includes
Moving the file
Changing src/expr/CMakeLists.txt and src/CMakeLists.txt
clang-format, omitting node_visitor.h.
In reference to discussion, here.
Aina Niemetz [Tue, 17 Mar 2020 04:35:21 +0000 (21:35 -0700)]
SmtEngine: Convert members owned by SmtEngine to unique pointers. (#4108)
Alex Ozdemir [Mon, 16 Mar 2020 19:36:07 +0000 (12:36 -0700)]
Remove AlwaysAssert(false) for hole.
Alex Ozdemir [Mon, 16 Mar 2020 19:35:17 +0000 (12:35 -0700)]
clang-format
Alex Ozdemir [Mon, 16 Mar 2020 19:34:41 +0000 (12:34 -0700)]
Fix simplicity check in prop
Alex Ozdemir [Mon, 16 Mar 2020 19:19:06 +0000 (12:19 -0700)]
Fix antecedent loop. Whoops
Alex Ozdemir [Mon, 16 Mar 2020 19:17:43 +0000 (12:17 -0700)]
Only save farkas+tightening proofs. Error on holes
I'll remove the error later
Alex Ozdemir [Wed, 4 Mar 2020 08:20:10 +0000 (00:20 -0800)]
Expand the definition of a "simple" farkas proof.
Before, a "simple farkas proof" was one that just applied the farkas
lemma.
Now it allows for the antecedents to (optionally) be tightened.
Note that hasSimpleFarkasProof was (and is) dead code.
We will use it to decide whether to print a proof or a hole.
Aina Niemetz [Mon, 16 Mar 2020 20:10:05 +0000 (13:10 -0700)]
DecisionEngine: Use single unique pointer for ITE strategy . (#4078)
Previously, DecisionEngine maintained a vector of ITE strategies.
However, only one was ever created. This uses a single unique_ptr member
for the ITE strategy instead of a vector.
Aina Niemetz [Mon, 16 Mar 2020 18:22:15 +0000 (11:22 -0700)]
Issue 4077: Add unit test to reproduce issue. (#4107)
This adds the unit test reported in issue #4077.
The issue was fixed in #4081.
Andres Noetzli [Mon, 16 Mar 2020 17:37:19 +0000 (10:37 -0700)]
Create master equality engine at context level 0 (#4081)
Fixes #4077. The master equality engine in `TheoryEngine` was being
created at SAT context level 1. If the context was popped to level zero
by `(reset-assertions)`, `true` and `false` were removed from the master
equality engine, which lead for example to `(= ((_ extract 3 3) x) (_
bv1 1))` and `(_ bv1 4)` being merged (this can be gathered from looking
at `-t equality`). This commit fixes the issue by postponing the global
context pushes until after the theory engine has been initialized.
Andrew Reynolds [Mon, 16 Mar 2020 04:51:51 +0000 (23:51 -0500)]
Handle cases in --sygus-rr where evaluation is not constant (#4100)
Throws warning instead of error if two terms with the same rewritten form evaluate differently, but the evaluation is non-constant.
Fixes #4096 and fixes #4089.