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https://github.com/Z3Prover/z3
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122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
/*++
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Copyright (c) 2015 Microsoft Corporation
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Module Name:
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lackr.h
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Abstract:
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Author:
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Mikolas Janota
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Revision History:
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--*/
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#ifndef LACKR_H_
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#define LACKR_H_
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#include "ackermannization/ackr_info.h"
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#include "ackermannization/ackr_helper.h"
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#include "ast/rewriter/th_rewriter.h"
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#include "ast/bv_decl_plugin.h"
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#include "util/lbool.h"
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#include "model/model.h"
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#include "solver/solver.h"
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#include "util/util.h"
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#include "tactic/tactic_exception.h"
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#include "tactic/goal.h"
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struct lackr_stats {
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lackr_stats() : m_it(0), m_ackrs_sz(0) {}
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void reset() { m_it = m_ackrs_sz = 0; }
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unsigned m_it; // number of lazy iterations
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unsigned m_ackrs_sz; // number of congruence constraints
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};
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/** \brief
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A class to encode or directly solve problems with uninterpreted functions via ackermannization.
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Currently, solving is supported only for QF_UFBV.
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**/
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class lackr {
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public:
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lackr(ast_manager& m, const params_ref& p, lackr_stats& st,
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const ptr_vector<expr>& formulas, solver * uffree_solver);
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~lackr();
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void updt_params(params_ref const & _p);
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/** \brief
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* Solve the formula that the class was initialized with.
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**/
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lbool operator() ();
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/** \brief
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Converts function occurrences to constants and encodes all congruence ackermann lemmas.
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This procedure guarantees a equisatisfiability with the input formula and it has a worst-case quadratic blowup.
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Before ackermannization an upper bound on congruence lemmas is computed and tested against \p lemmas_upper_bound.
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If this bound is exceeded, the function returns false, it returns true otherwise.
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**/
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bool mk_ackermann(/*out*/goal_ref& g, double lemmas_upper_bound);
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//
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// getters
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//
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inline ackr_info_ref get_info() { return m_info; }
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inline model_ref get_model() { return m_model; }
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//
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// timeout mechanism
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//
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void checkpoint() {
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if (m_m.canceled()) {
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throw tactic_exception(TACTIC_CANCELED_MSG);
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}
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}
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private:
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typedef ackr_helper::fun2terms_map fun2terms_map;
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typedef ackr_helper::app_set app_set;
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ast_manager& m_m;
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params_ref m_p;
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const ptr_vector<expr>& m_formulas;
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expr_ref_vector m_abstr;
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fun2terms_map m_fun2terms;
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ackr_info_ref m_info;
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solver* m_sat;
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ackr_helper m_ackr_helper;
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th_rewriter m_simp;
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expr_ref_vector m_ackrs;
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model_ref m_model;
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bool m_eager;
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lackr_stats& m_st;
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bool m_is_init;
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bool init();
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lbool eager();
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lbool lazy();
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//
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// Introduce congruence ackermann lemma for the two given terms.
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//
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bool ackr(app * t1, app * t2);
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//
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// Introduce the ackermann lemma for each pair of terms.
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//
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void eager_enc();
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void abstract();
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void push_abstraction();
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void add_term(app* a);
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//
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// Collect all uninterpreted terms, skipping 0-arity.
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//
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bool collect_terms();
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};
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#endif /* LACKR_H_ */
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