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add EUF plugin framework.

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plugin setting allows adding equality saturation within the E-graph propagation without involving externalizing theory solver dispatch. It makes equality saturation independent of SAT integration.
Add a special relation operator to support ad-hoc AC symbols.
This commit is contained in:
Nikolaj Bjorner 2023-11-30 13:58:24 -08:00
parent 5784c2da79
commit b52fd8d954
28 changed files with 3063 additions and 68 deletions
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75
src/sat/smt/specrel_solver.h Normal file
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/*++
Copyright (c) 2020 Microsoft Corporation
Module Name:
specrel_solver.h
Abstract:
Theory plugin for special relations
Author:
Nikolaj Bjorner (nbjorner) 2020-09-08
--*/
#pragma once
#include "sat/smt/sat_th.h"
#include "ast/special_relations_decl_plugin.h"
namespace euf {
class solver;
}
namespace specrel {
class solver : public euf::th_euf_solver {
typedef euf::theory_var theory_var;
typedef euf::theory_id theory_id;
typedef euf::enode enode;
typedef euf::enode_pair enode_pair;
typedef euf::enode_pair_vector enode_pair_vector;
typedef sat::bool_var bool_var;
typedef sat::literal literal;
typedef sat::literal_vector literal_vector;
special_relations_util sp;
public:
solver(euf::solver& ctx, theory_id id);
~solver() override;
bool is_external(bool_var v) override { return false; }
void get_antecedents(literal l, sat::ext_justification_idx idx, literal_vector& r, bool probing) override {}
void asserted(literal l) override;
sat::check_result check() override;
std::ostream& display(std::ostream& out) const override;
std::ostream& display_justification(std::ostream& out, sat::ext_justification_idx idx) const override { return euf::th_explain::from_index(idx).display(out); }
std::ostream& display_constraint(std::ostream& out, sat::ext_constraint_idx idx) const override { return display_justification(out, idx); }
void collect_statistics(statistics& st) const override;
euf::th_solver* clone(euf::solver& ctx) override;
void new_eq_eh(euf::th_eq const& eq) override;
bool unit_propagate() override { return false; }
void add_value(euf::enode* n, model& mdl, expr_ref_vector& values) override;
bool add_dep(euf::enode* n, top_sort<euf::enode>& dep) override;
bool include_func_interp(func_decl* f) const override;
sat::literal internalize(expr* e, bool sign, bool root) override;
void internalize(expr* e) override;
bool visit(expr* e) override;
bool visited(expr* e) override;
bool post_visit(expr* e, bool sign, bool root) override;
euf::theory_var mk_var(euf::enode* n) override;
void apply_sort_cnstr(euf::enode* n, sort* s) override {}
bool is_shared(theory_var v) const override { return false; }
lbool get_phase(bool_var v) override { return l_true; }
bool enable_self_propagate() const override { return true; }
void merge_eh(theory_var, theory_var, theory_var v1, theory_var v2);
void after_merge_eh(theory_var r1, theory_var r2, theory_var v1, theory_var v2) {}
void unmerge_eh(theory_var v1, theory_var v2) {}
};
}