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https://github.com/Z3Prover/z3
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66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
/*++
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Copyright (c) 2022 Microsoft Corporation
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Module Name:
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q_theory_checker.cpp
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Abstract:
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Plugin for checking quantifier instantiations
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Author:
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Nikolaj Bjorner (nbjorner) 2022-10-07
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--*/
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#include "ast/rewriter/var_subst.h"
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#include "sat/smt/q_theory_checker.h"
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#include "sat/smt/q_solver.h"
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namespace q {
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expr_ref_vector theory_checker::clause(app* jst) {
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expr_ref_vector result(m);
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for (expr* arg : *jst)
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if (m.is_bool(arg))
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result.push_back(mk_not(m, arg));
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return result;
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}
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expr_ref_vector theory_checker::binding(app* jst) {
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expr_ref_vector result(m);
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for (expr* arg : *jst)
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if (is_bind(arg)) {
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result.append(to_app(arg)->get_num_args(), to_app(arg)->get_args());
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break;
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}
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return result;
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}
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bool theory_checker::vc(app* jst, expr_ref_vector const& clause0, expr_ref_vector& v) {
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expr* q = nullptr;
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if (!is_inst(jst))
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return false;
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auto clause1 = clause(jst);
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SASSERT(clause1.size() >= 2);
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VERIFY(m.is_not(clause1.get(0), q) && is_forall(q));
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auto inst = binding(jst);
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expr_ref qi = instantiate(m, to_quantifier(q), inst.begin());
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clause1[0] = m.mk_not(qi);
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v.reset();
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v.append(clause1);
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return qi == clause1.get(1);
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}
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bool theory_checker::is_inst(expr* jst) {
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return is_app(jst) && to_app(jst)->get_name() == m_inst && m.mk_proof_sort() == jst->get_sort();
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}
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bool theory_checker::is_bind(expr* e) {
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return is_app(e) && to_app(e)->get_name() == m_bind && m.mk_proof_sort() == e->get_sort();
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}
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}
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