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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 does another round of refactoring of the resource manager and related code.
- it moves the Resource enum out of the ResourceManager class
- it treats the resources in a generic way (storing the statistics in a vector) instead of the manual treatment we had before
- weights no longer live in the options, but in the ResourceManager and are changed accordingly in the ResourceManager constructor
- following the generic treatment of resources, it also removes all the resource-specific options --x-step in favor of a generic --rweight name=weight
- removed several unused methods from the ResourceManager
Note that we handle the Resource enum in a way that allows to easily use other enums as additional resources, for example InferenceId. The general idea is that we will at some point have sensible default weights (so that the cumulative resources somewhat simulate the solver runtime) and users (almost) never need to modify them.
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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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(#6240)
This completes eliminating dependencies on quantifiers engine from internal quantifiers code. It eliminates quantifiers_engine.h as an include from src/theory/quantifiers/ apart from theory_quantifiers.cpp where it is owned.
Followup PRs will further eliminate circular dependencies that arose will refactoring quantifiers engine.
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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 simplifies the initialization of quantifiers engine.
This PR also makes general improvements to EqualityQuery.
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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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This makes all lemmas in quantifiers sent through the inference manager. It begins adding InferenceId values for some of these calls. All uses of Valuation are replaced by calls to QuantifiersState.
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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 PR collects the InferenceId in the InferenceManagerBuffered class.
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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 dependence on QuantifierEngine from inst_match_trie.
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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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This was a feature implemented for "Deciding Local Theory Extensions via E-matching" CAV 2015 that is not used anymore, and will be a burden to maintain further with potential changes to term database.
It also simplifies the TermDatabase::addTerm method (which changed indentation).
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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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Work towards eliminating dependencies on quantifiers engine, this updates quantifiers module to use the standard SAT-context dependent flag in quantifiers state instead of the one in QuantifiersEngine. It also eliminates the use of a custom call to theoryEngineNeedsCheck.
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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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Now the old proofs are used for unsat cores only if proofNew is disabled. Later commits will generate unsat cores from the new proofs when requested. Eventually we will compare them and when we confirm the new unsat core generation is better we will delete the old one.
This also does some minor refactoring in some preprocessing. No behavior is changed.
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(#5477)
This replaces the old implementation of CEGQI based on nested quantifier elimination (--cegqi-nested-qe) with the new implementation.
The previous implementation used some convoluted internal attributes to manage dependencies between quantified formulas, the new implementation is much simpler: it simply eliminates nested quantification eagerly.
Fixes #5365, fixes #5279, fixes #4849, fixes #4433.
This PR also required fixes related to how quantifier elimination is computed.
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Ensuring closed proofs should not be enabled by default, it is actually not used very often as a whole. Moreover, the "trust id" argument is the most useful argument and hence should come as the 3rd argument. This updates all uses of addLazyStep for the change in interface, also changes term conversion generator which had a similar issue with default arguments.
Notice that some calls to addLazyStep were checking closed but without providing a debug string, these I've left alone (they no longer check closed).
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Includes minor changes to the proof checker and a fix in the instantiate module.
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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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Fixes 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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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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Fixes #4228. That benchmark now times out.
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Fixes #4003.
Protects against a (class of) nonsensical option combinations.
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This commit adds statistics for all resource steps. A resource statistic is incremented by 1 if the resource is spent (via `spendResource`).
Fixes #3751.
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(#3641)
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