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This adds an option to limit the number of instantiation rounds used by quantifiers engine.
This option may be generally useful for making quantifiers terminating. It also is necessary to update the new default behavior of SyGuS + recursive functions. A followup PR will make sygus verification calls set the option added on this PR automatically, so that we use incomplete + termination strategies for (non-PBE) sygus in the presence of recursive functions.
This PR also makes minor improvements to the quantifier utility infrastructure.
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This moves all generic proof utilites from src/expr/ and src/theory/ to src/proof/.
It also changes the include for term conversion proof generator to conv_proof_generator in preparation to rename this utility on a followup PR (to avoid confusion with the use of "Term").
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Eliminates NodeHashFunction, TNodeHashFunction and TypeNodeHashFunction.
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This PR refactors how we collect statistics.
It splits the current statistic values into the values and a proxy object. The actual values now live inside the registry (making the ownership model way easier) while the proxy object are handed to whoever wants to collect a new statistic.
It also extends the C++ API to obtain and inspect the statistics.
To change the ownership, this PR needs to touch every single statistic in the whole codebase and change how it is registered.
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This PR classifies all internal kinds of incompleteness as identifiers.
It makes it so TheoryEngine records an identifier when its incomplete flag is set.
The next step will be to possibly communicate this value to the user.
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We require tracking of instantiation lemmas for quantifier elimination. Recently, this feature was removed in favor of reconstructing instantiations via substitutions. This does not quite work if instantiation lemmas have more complex post-processing, e.g. virtual term substitution.
This PR reimplements a much simpler form of instantiation tracking that simply adds instantiation bodies to a vector, per quantified formula. It uses this vector for quantifier elimination.
Fixes #5899.
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Model is now nested into term registry.
This PR also resolves some complications due to namespaces within quantifiers.
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After this PR, utilities for instantiation are available from the quantifiers inference manager instead of quantifiers engine. This means that the majority of the dependencies on quantifiers engine will (finally) start being cleaned up after this PR.
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This makes quantifiers use standard inference ids.
This eliminates the need to track ad-hoc statistics, per instantiation type.
This makes minor modifications to a few interfaces in quantifiers to enable this.
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This PR does some more cleanup of the includes.
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This PR cleans up a ton of includes, based on the suggestions of iwyu.
Mostly, it removes includes from header files in favor of forward declarations and adds includes to source files.
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This makes enumerative instantiation generalize the failures in Instantiate::addInstantiate and increment its enumeration accordingly.
This leads to (+104-6) using enumerative instantiation only on SMT-LIB quantified benchmarks, 60 second timeout.
This is in preparation for further improvements to enumerative instantiation.
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Does not support InstMatch interfaces anymore, which are spurious.
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Towards eliminating dependencies on quantifiers engine, and eliminating the TermUtil class.
Note that QuantifiersModule had to be moved to its own file to avoid circular include dependencies.
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This was used in the old method for unsat core tracking for instantiation lemmas, which will soon be subsumed.
This is also work towards eliminating the dependencies on quantifiers engine from Instantiate.
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Towards eliminating dependencies on quantifiers engine.
This replaces the custom implementation of lemma management in quantifiers engine with the standard one.
It makes a few minor changes to the standard inference manager classes to ensure the same behavior for quantifiers.
Note that some minor changes in behavior are introduced in this PR, such as being more consistent about caching/rewriting lemmas. This should not have any major impact.
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(#5814)
This makes printing instantiations done at the SmtEngine level instead of deeply embedded within the Instantiate module. This provides much better flexibility for future uses of instantiations (e.g. how they are minimized in the new proof infrastructure).
Note this PR breaks the functionality that instantiations are minimized based on the old unsat cores infrastructure (see the disabled regression). This will be fixed once proof-new is fully merged.
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This is a step towards breaking up the quantifiers engine.
The key change is that QuantifiersEngine will not be passed as a pointer to the modules it contains. This PR makes it so that necessary modules take a QuantifiersState, which will eventually be extended as needed with additional query methods. For now, modules will take both until the dependencies on QuantifersEngine are removed.
This required that QuantifiersEngine now lives in TheoryQuantifiers, instead of in TheoryEngine, since the QuantifiersEngine must be initialized with QuantifiersState, which is a member of TheoryQuantifiers. Now, TheoryEngine retrieves the QuantifiersEngine from TheoryQuantifiers prior to finishing initialization on theories.
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This PR updates the update-copyright.pl script to also update/add copyright headers to CMake specific files. It further fixes a small typo in the header.
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This adds basic support for proofs of quantifier instantiation, which is the main method for sending lemmas from TheoryQuantifiers. Quantifier instantiation is also heavily used for solving extended string functions.
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This deletes much of the old proof code. Basically everything but the minimal necessary infra-structure for producing unsat cores. That includes dependency tracking in preprocessing, the prop engine proof and the unsat core computation code in the old proof manager. These should also go once we fully integrate into master the new proof infrastructure.
It also cleans interfaces that were using old-proof-code-specific constructs (such as LemmaProofRecipe). When possible or when it made sense standalone local proof production code was kept, but deactivated (such is in the equality engine and in the arithmetic solver).
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This was an option that rejected instantiations that are true according to the current
model's equality engine.
This option was never helpful and will be burdensome to maintain with new updates
to equality engine infrastructure.
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This prints # instantiations per round (during solving) for each quantified formula with `--debug-inst`, giving output like this:
```
(num-instantiations myQuant1 1)
(num-instantiations myQuant2 1)
unsat
```
It also changes the default value of print-inst-full to match the behavior of unsat-cores vs unsat-cores-full (by default, nameless quantifiers are ignored).
It fixes an issue with qid, where mkVar was accidentally used instead of mkConst, leading to assertion failures in debug. Marking major since this fixes debug regress1.
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This adds a new print format for instantiations --print-instantiations=num, which prints the total number of instantations of quantified formulas. This count is user-context-dependent, which is in sync with the existing print-instantiation format (list).
It also simplifies and improves printing of Instantiation Tries.
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Fixes #4228. That benchmark now times out.
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Fixes 2887.
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Adds missing override keywords.
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