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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.
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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.
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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.
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This is for consistency with the other helper functions.
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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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Also removes another instance of empty string in TheoryStrings for consistency sake.
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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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Introduce enum values for all calls to sendInference outside of the core solver.
This included some minor refactoring.
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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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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.
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Towards theory of sequences.
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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.
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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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Fixes #4180, fixes CVC4/cvc4-projects#133, fixes CVC4/cvc4-projects#134.
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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
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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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In preparation for string proof infrastructure.
This introduces an enumeration type to track string rewrites.
It also makes inference printing more consistent.
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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>
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* 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>
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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.
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Moves the string file to string.h. This is required since other required utilities will soon need to be added to regexp.h.
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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 .
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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.
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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.
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* 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>
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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.
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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.
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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.
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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.
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Towards theory of sequences.
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This PR delays error on unsupported symbols as much as possible, by only throwing the error when actually constructing the node.
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Fixes #4143.
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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 .
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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).
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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.
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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.
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Fixes #4112.
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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.
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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.
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