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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Builtin proof checker utility. |
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*/ |
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#include "cvc5_private.h" |
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#ifndef CVC5__THEORY__BUILTIN__PROOF_CHECKER_H |
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#define CVC5__THEORY__BUILTIN__PROOF_CHECKER_H |
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#include "expr/node.h" |
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#include "proof/method_id.h" |
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#include "proof/proof_checker.h" |
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#include "proof/proof_node.h" |
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#include "theory/quantifiers/extended_rewrite.h" |
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namespace cvc5 { |
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class Env; |
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namespace theory { |
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namespace builtin { |
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/** A checker for builtin proofs */ |
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class BuiltinProofRuleChecker : public ProofRuleChecker |
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{ |
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public: |
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/** Constructor. */ |
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BuiltinProofRuleChecker(Env& env); |
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/** Destructor. */ |
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~BuiltinProofRuleChecker() {} |
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/** |
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* Get substitution for literal exp. Updates vars/subs to the substitution |
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* specified by exp for the substitution method ids. |
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*/ |
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static bool getSubstitutionForLit(Node exp, |
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TNode& var, |
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TNode& subs, |
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MethodId ids = MethodId::SB_DEFAULT); |
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/** |
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* Get substitution for formula exp. Adds to vars/subs to the substitution |
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* specified by exp for the substitution method ids, which may be multiple |
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* substitutions if exp is of kind AND and ids is SB_DEFAULT (note the other |
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* substitution types always interpret applications of AND as a formula). |
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* The vector "from" are the literals from exp that each substitution in |
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* vars/subs are based on. For example, if exp is (and (= x t) (= y s)), then |
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* vars = { x, y }, subs = { t, s }, from = { (= x y), (= y s) }. |
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*/ |
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static bool getSubstitutionFor(Node exp, |
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std::vector<TNode>& vars, |
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std::vector<TNode>& subs, |
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std::vector<TNode>& from, |
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MethodId ids = MethodId::SB_DEFAULT); |
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/** |
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* Apply substitution on n in skolem form. This encapsulates the exact |
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* behavior of a SUBS step in a proof. |
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* |
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* @param n The node to substitute, |
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* @param exp The (set of) equalities/literals/formulas that the substitution |
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* is derived from |
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* @param ids The method identifier of the substitution, by default SB_DEFAULT |
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* specifying that lhs/rhs of equalities are interpreted as a substitution. |
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* @param ida The method identifier of the substitution application, by |
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* default SB_SEQUENTIAL specifying that substitutions are to be applied |
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* sequentially |
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* @return The substituted form of n. |
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*/ |
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static Node applySubstitution(Node n, |
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Node exp, |
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MethodId ids = MethodId::SB_DEFAULT, |
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MethodId ida = MethodId::SBA_SEQUENTIAL); |
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static Node applySubstitution(Node n, |
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const std::vector<Node>& exp, |
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MethodId ids = MethodId::SB_DEFAULT, |
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MethodId ida = MethodId::SBA_SEQUENTIAL); |
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/** Apply substitution + rewriting |
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* |
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* Combines the above two steps. |
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* |
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* @param n The node to substitute and rewrite, |
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* @param exp The (set of) equalities corresponding to the substitution |
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* @param ids The method identifier of the substitution. |
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* @param ida The method identifier of the substitution application. |
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* @param idr The method identifier of the rewriter. |
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* @return The substituted, rewritten form of n. |
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*/ |
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Node applySubstitutionRewrite(Node n, |
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const std::vector<Node>& exp, |
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MethodId ids = MethodId::SB_DEFAULT, |
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MethodId ida = MethodId::SBA_SEQUENTIAL, |
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MethodId idr = MethodId::RW_REWRITE); |
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/** get a TheoryId from a node, return false if we fail */ |
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static bool getTheoryId(TNode n, TheoryId& tid); |
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/** Make a TheoryId into a node */ |
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static Node mkTheoryIdNode(TheoryId tid); |
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/** Register all rules owned by this rule checker into pc. */ |
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void registerTo(ProofChecker* pc) override; |
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protected: |
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/** Return the conclusion of the given proof step, or null if it is invalid */ |
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Node checkInternal(PfRule id, |
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const std::vector<Node>& children, |
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const std::vector<Node>& args) override; |
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/** extended rewriter object */ |
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quantifiers::ExtendedRewriter d_ext_rewriter; |
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private: |
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/** Reference to the environment. */ |
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Env& d_env; |
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}; |
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} // namespace builtin |
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} // namespace theory |
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} // namespace cvc5 |
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#endif /* CVC5__THEORY__BUILTIN__PROOF_CHECKER_H */ |