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Diffstat (limited to 'src/theory/theory_inference.h')
-rw-r--r-- | src/theory/theory_inference.h | 106 |
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diff --git a/src/theory/theory_inference.h b/src/theory/theory_inference.h new file mode 100644 index 000000000..8d98051bf --- /dev/null +++ b/src/theory/theory_inference.h @@ -0,0 +1,106 @@ +/********************* */ +/*! \file theory_inference.h + ** \verbatim + ** Top contributors (to current version): + ** Andrew Reynolds + ** This file is part of the CVC4 project. + ** Copyright (c) 2009-2020 by the authors listed in the file AUTHORS + ** in the top-level source directory) and their institutional affiliations. + ** All rights reserved. See the file COPYING in the top-level source + ** directory for licensing information.\endverbatim + ** + ** \brief The theory inference utility + **/ + +#include "cvc4_private.h" + +#ifndef CVC4__THEORY__THEORY_INFERENCE_H +#define CVC4__THEORY__THEORY_INFERENCE_H + +#include "expr/node.h" +#include "theory/output_channel.h" + +namespace CVC4 { +namespace theory { + +class TheoryInferenceManager; + +/** + * A theory inference base class. This class is an abstract data structure for + * storing pending lemmas or facts in the buffered inference manager. It can + * be seen a single use object capturing instructions for making a single + * call to TheoryInferenceManager for lemmas or facts. + */ +class TheoryInference +{ + public: + virtual ~TheoryInference() {} + /** + * Called by the provided inference manager to process this inference. This + * method should make call(s) to inference manager to process this + * inference, as well as processing any specific side effects. This method + * typically makes a single call to the provided inference manager e.g. + * d_im->trustedLemma or d_im->assertFactInternal. Notice it is the sole + * responsibility of this class to make this call; the inference manager + * does not call itself otherwise when processing pending inferences. + * + * @return true if the inference was successfully processed by the inference + * manager. This method for instance returns false if it corresponds to a + * lemma that was already cached by im and hence was discarded. + */ + virtual bool process(TheoryInferenceManager* im) = 0; +}; + +/** + * A simple theory lemma with no side effects. Makes a single call to + * trustedLemma in its process method. + */ +class SimpleTheoryLemma : public TheoryInference +{ + public: + SimpleTheoryLemma(Node n, LemmaProperty p, ProofGenerator* pg); + virtual ~SimpleTheoryLemma() {} + /** + * Send the lemma using inference manager im, return true if the lemma was + * sent. + */ + virtual bool process(TheoryInferenceManager* im) override; + /** The lemma to send */ + Node d_node; + /** The lemma property (see OutputChannel::lemma) */ + LemmaProperty d_property; + /** + * The proof generator for this lemma, which if non-null, is wrapped in a + * TrustNode to be set on the output channel via trustedLemma at the time + * the lemma is sent. This proof generator must be able to provide a proof + * for d_node in the remainder of the user context. + */ + ProofGenerator* d_pg; +}; + +/** + * A simple internal fact with no side effects. Makes a single call to + * assertFactInternal in its process method. + */ +class SimpleTheoryInternalFact : public TheoryInference +{ + public: + SimpleTheoryInternalFact(Node conc, Node exp, ProofGenerator* pg); + virtual ~SimpleTheoryInternalFact() {} + /** + * Send the lemma using inference manager im, return true if the lemma was + * sent. + */ + virtual bool process(TheoryInferenceManager* im) override; + /** The lemma to send */ + Node d_conc; + /** The explanation */ + Node d_exp; + /** The proof generator */ + ProofGenerator* d_pg; +}; + +} // namespace theory +} // namespace CVC4 + +#endif |