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Issue #7502 shows that running nlsat eagerly during final check can block quantifier instantiation. To give space for quantifier instances we introduce two levels for final check such that nlsat is only applied in the second and final level.
48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
/*++
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Copyright (c) 2011 Microsoft Corporation
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Module Name:
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theory_seq_empty.h
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Abstract:
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<abstract>
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Author:
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Nikolaj Bjorner (nbjorner) 2011-14-11
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Revision History:
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--*/
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#pragma once
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#include "ast/seq_decl_plugin.h"
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#include "model/seq_factory.h"
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#include "smt/smt_theory.h"
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#include "smt/smt_model_generator.h"
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namespace smt {
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class theory_seq_empty : public theory {
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bool m_used;
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final_check_status final_check_eh(unsigned) override { return m_used?FC_GIVEUP:FC_DONE; }
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bool internalize_atom(app*, bool) override { if (!m_used) { get_context().push_trail(value_trail<bool>(m_used)); m_used = true; } return false; }
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bool internalize_term(app*) override { return internalize_atom(nullptr,false); }
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void new_eq_eh(theory_var, theory_var) override { }
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void new_diseq_eh(theory_var, theory_var) override {}
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theory* mk_fresh(context* new_ctx) override { return alloc(theory_seq_empty, *new_ctx); }
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char const * get_name() const override { return "seq-empty"; }
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void display(std::ostream& out) const override {}
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public:
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theory_seq_empty(context& ctx):theory(ctx, ctx.get_manager().mk_family_id("seq")), m_used(false) {}
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void init_model(model_generator & mg) override {
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mg.register_factory(alloc(seq_factory, get_manager(), get_family_id(), mg.get_model()));
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}
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};
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};
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