mirror of
https://github.com/Z3Prover/z3
synced 2025-04-08 10:25:18 +00:00
prepare char utilities as a stand-alone theory
This commit is contained in:
parent
785fab74f4
commit
31b7ad3012
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@ -20,6 +20,7 @@ Revision History:
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#include "ast/seq_decl_plugin.h"
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#include "model/model_core.h"
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#include "model/value_factory.h"
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class seq_factory : public value_factory {
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typedef hashtable<symbol, symbol_hash_proc, symbol_eq_proc> symbol_set;
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@ -17,7 +17,6 @@ z3_add_component(smt
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seq_offset_eq.cpp
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seq_regex.cpp
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seq_skolem.cpp
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seq_char.cpp
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smt_almost_cg_table.cpp
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smt_arith_value.cpp
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smt_case_split_queue.cpp
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@ -61,6 +60,7 @@ z3_add_component(smt
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theory_array.cpp
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theory_array_full.cpp
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theory_bv.cpp
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theory_char.cpp
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theory_datatype.cpp
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theory_dense_diff_logic.cpp
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theory_diff_logic.cpp
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@ -16,16 +16,16 @@ Author:
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--*/
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#include "ast/bv_decl_plugin.h"
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#include "smt/seq_char.h"
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#include "smt/theory_char.h"
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#include "smt/smt_context.h"
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#include "smt/smt_model_generator.h"
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namespace smt {
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seq_char::seq_char(theory& th):
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th(th),
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m(th.get_manager()),
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theory_char::theory_char(context& ctx, family_id fid):
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theory(ctx, fid),
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seq(m),
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m_bb(m, ctx().get_fparams())
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m_bb(m, ctx.get_fparams())
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{
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bv_util bv(m);
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sort_ref b8(bv.mk_sort(8), m);
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@ -33,11 +33,11 @@ namespace smt {
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m_bits2char = symbol("bits2char");
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}
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struct seq_char::reset_bits : public trail<context> {
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seq_char& s;
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struct theory_char::reset_bits : public trail<context> {
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theory_char& s;
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unsigned idx;
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reset_bits(seq_char& s, unsigned idx):
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reset_bits(theory_char& s, unsigned idx):
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s(s),
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idx(idx)
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{}
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@ -48,10 +48,32 @@ namespace smt {
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}
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};
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bool seq_char::has_bits(theory_var v) const {
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bool theory_char::has_bits(theory_var v) const {
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return (m_bits.size() > (unsigned)v) && !m_bits[v].empty();
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}
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bool theory_char::internalize_atom(app * term, bool gate_ctx) {
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for (auto arg : *term)
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mk_var(ensure_enode(arg));
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bool_var bv = ctx.mk_bool_var(term);
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ctx.set_var_theory(bv, get_id());
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ctx.mark_as_relevant(bv);
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if (seq.is_char_le(term))
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internalize_le(literal(bv, false), term);
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return true;
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}
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bool theory_char::internalize_term(app * term) {
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for (auto arg : *term)
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mk_var(ensure_enode(arg));
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theory_var v = mk_var(ensure_enode(term));
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unsigned c = 0;
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if (seq.is_const_char(term, c))
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new_const_char(v, c);
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return true;
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}
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/**
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* Initialize bits associated with theory variable v.
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* add also the equality bits2char(char2bit(e, 0),..., char2bit(e, 15)) = e
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@ -62,17 +84,17 @@ namespace smt {
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* independently and adds Ackerman axioms on demand.
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*/
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void seq_char::init_bits(theory_var v) {
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void theory_char::init_bits(theory_var v) {
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if (has_bits(v))
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return;
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expr* e = th.get_expr(v);
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expr* e = get_expr(v);
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m_bits.reserve(v + 1);
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auto& bits = m_bits[v];
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while ((unsigned) v >= m_ebits.size())
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m_ebits.push_back(expr_ref_vector(m));
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ctx().push_trail(reset_bits(*this, v));
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ctx.push_trail(reset_bits(*this, v));
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auto& ebits = m_ebits[v];
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SASSERT(ebits.empty());
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@ -80,96 +102,96 @@ namespace smt {
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if (is_bits2char) {
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for (expr* arg : *to_app(e)) {
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ebits.push_back(arg);
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bits.push_back(literal(ctx().get_bool_var(arg)));
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bits.push_back(literal(ctx.get_bool_var(arg)));
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}
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}
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else {
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for (unsigned i = 0; i < seq.num_bits(); ++i)
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ebits.push_back(seq.mk_char_bit(e, i));
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ctx().internalize(ebits.c_ptr(), ebits.size(), true);
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ctx.internalize(ebits.c_ptr(), ebits.size(), true);
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for (expr* arg : ebits)
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bits.push_back(literal(ctx().get_bool_var(arg)));
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bits.push_back(literal(ctx.get_bool_var(arg)));
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for (literal bit : bits)
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ctx().mark_as_relevant(bit);
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ctx.mark_as_relevant(bit);
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expr_ref bits2char(seq.mk_skolem(m_bits2char, ebits.size(), ebits.c_ptr(), m.get_sort(e)), m);
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ctx().mark_as_relevant(bits2char.get());
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enode* n1 = th.ensure_enode(e);
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enode* n2 = th.ensure_enode(bits2char);
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ctx.mark_as_relevant(bits2char.get());
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enode* n1 = ensure_enode(e);
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enode* n2 = ensure_enode(bits2char);
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justification* j =
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ctx().mk_justification(
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ext_theory_eq_propagation_justification(th.get_id(), ctx().get_region(), n1, n2));
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ctx().assign_eq(n1, n2, eq_justification(j));
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ctx.mk_justification(
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ext_theory_eq_propagation_justification(get_id(), ctx.get_region(), n1, n2));
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ctx.assign_eq(n1, n2, eq_justification(j));
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}
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++m_stats.m_num_blast;
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}
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void seq_char::internalize_le(literal lit, app* term) {
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void theory_char::internalize_le(literal lit, app* term) {
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expr* x = nullptr, *y = nullptr;
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VERIFY(seq.is_char_le(term, x, y));
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theory_var v1 = ctx().get_enode(x)->get_th_var(th.get_id());
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theory_var v2 = ctx().get_enode(y)->get_th_var(th.get_id());
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theory_var v1 = ctx.get_enode(x)->get_th_var(get_id());
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theory_var v2 = ctx.get_enode(y)->get_th_var(get_id());
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init_bits(v1);
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init_bits(v2);
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auto const& b1 = get_ebits(v1);
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auto const& b2 = get_ebits(v2);
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expr_ref e(m);
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m_bb.mk_ule(b1.size(), b1.c_ptr(), b2.c_ptr(), e);
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literal le = th.mk_literal(e);
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ctx().mark_as_relevant(le);
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ctx().mk_th_axiom(th.get_id(), ~lit, le);
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ctx().mk_th_axiom(th.get_id(), lit, ~le);
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literal le = mk_literal(e);
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ctx.mark_as_relevant(le);
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ctx.mk_th_axiom(get_id(), ~lit, le);
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ctx.mk_th_axiom(get_id(), lit, ~le);
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}
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literal_vector const& seq_char::get_bits(theory_var v) {
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literal_vector const& theory_char::get_bits(theory_var v) {
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init_bits(v);
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return m_bits[v];
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}
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expr_ref_vector const& seq_char::get_ebits(theory_var v) {
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expr_ref_vector const& theory_char::get_ebits(theory_var v) {
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init_bits(v);
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return m_ebits[v];
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}
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// = on characters
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void seq_char::new_eq_eh(theory_var v, theory_var w) {
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void theory_char::new_eq_eh(theory_var v, theory_var w) {
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if (has_bits(v) && has_bits(w)) {
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auto& a = get_bits(v);
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auto& b = get_bits(w);
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literal _eq = null_literal;
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auto eq = [&]() {
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if (_eq == null_literal) {
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_eq = th.mk_literal(m.mk_eq(th.get_expr(v), th.get_expr(w)));
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ctx().mark_as_relevant(_eq);
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_eq = mk_literal(m.mk_eq(get_expr(v), get_expr(w)));
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ctx.mark_as_relevant(_eq);
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}
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return _eq;
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};
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for (unsigned i = a.size(); i-- > 0; ) {
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lbool v1 = ctx().get_assignment(a[i]);
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lbool v2 = ctx().get_assignment(b[i]);
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lbool v1 = ctx.get_assignment(a[i]);
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lbool v2 = ctx.get_assignment(b[i]);
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if (v1 != l_undef && v2 != l_undef && v1 != v2) {
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enforce_ackerman(v, w);
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return;
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}
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if (v1 == l_true)
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ctx().mk_th_axiom(th.get_id(), ~eq(), ~a[i], b[i]);
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ctx.mk_th_axiom(get_id(), ~eq(), ~a[i], b[i]);
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if (v1 == l_false)
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ctx().mk_th_axiom(th.get_id(), ~eq(), a[i], ~b[i]);
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ctx.mk_th_axiom(get_id(), ~eq(), a[i], ~b[i]);
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if (v2 == l_true)
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ctx().mk_th_axiom(th.get_id(), ~eq(), a[i], ~b[i]);
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ctx.mk_th_axiom(get_id(), ~eq(), a[i], ~b[i]);
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if (v2 == l_false)
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ctx().mk_th_axiom(th.get_id(), ~eq(), ~a[i], b[i]);
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ctx.mk_th_axiom(get_id(), ~eq(), ~a[i], b[i]);
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}
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}
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}
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// != on characters
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void seq_char::new_diseq_eh(theory_var v, theory_var w) {
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void theory_char::new_diseq_eh(theory_var v, theory_var w) {
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if (has_bits(v) && has_bits(w)) {
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auto& a = get_bits(v);
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auto& b = get_bits(w);
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for (unsigned i = a.size(); i-- > 0; ) {
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lbool v1 = ctx().get_assignment(a[i]);
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lbool v2 = ctx().get_assignment(b[i]);
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lbool v1 = ctx.get_assignment(a[i]);
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lbool v2 = ctx.get_assignment(b[i]);
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if (v1 == l_undef || v2 == l_undef || v1 != v2)
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return;
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}
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}
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}
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void seq_char::new_const_char(theory_var v, unsigned c) {
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void theory_char::new_const_char(theory_var v, unsigned c) {
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auto& bits = get_bits(v);
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for (auto b : bits) {
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bool bit = (0 != (c & 1));
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ctx().assign(bit ? b : ~b, nullptr);
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ctx.assign(bit ? b : ~b, nullptr);
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c >>= 1;
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}
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}
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* Enforce that values are within max_char.
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* 2. Assign values to characters that haven't been assigned.
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*/
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bool seq_char::final_check() {
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bool theory_char::final_check() {
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m_var2value.reset();
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m_var2value.resize(th.get_num_vars(), UINT_MAX);
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m_var2value.resize(get_num_vars(), UINT_MAX);
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m_value2var.reset();
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// extract the initial set of constants.
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uint_set values;
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unsigned c = 0, d = 0;
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for (unsigned v = th.get_num_vars(); v-- > 0; ) {
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expr* e = th.get_expr(v);
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for (unsigned v = get_num_vars(); v-- > 0; ) {
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expr* e = get_expr(v);
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if (seq.is_char(e) && m_var2value[v] == UINT_MAX && get_value(v, c)) {
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CTRACE("seq", seq.is_char(e), tout << mk_pp(e, m) << " root: " << th.get_enode(v)->is_root() << " is_value: " << get_value(v, c) << "\n";);
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enode* r = th.get_enode(v)->get_root();
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CTRACE("seq", seq.is_char(e), tout << mk_pp(e, m) << " root: " << get_enode(v)->is_root() << " is_value: " << get_value(v, c) << "\n";);
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enode* r = get_enode(v)->get_root();
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m_value2var.reserve(c + 1, null_theory_var);
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theory_var u = m_value2var[c];
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if (u != null_theory_var && r != th.get_enode(u)->get_root()) {
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if (u != null_theory_var && r != get_enode(u)->get_root()) {
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enforce_ackerman(u, v);
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return false;
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}
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return false;
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}
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for (enode* n : *r) {
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u = n->get_th_var(th.get_id());
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u = n->get_th_var(get_id());
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if (u == null_theory_var)
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continue;
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if (get_value(u, d) && d != c) {
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}
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// assign values to other unassigned nodes
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c = 'a';
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for (unsigned v = th.get_num_vars(); v-- > 0; ) {
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expr* e = th.get_expr(v);
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c = 'A';
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for (unsigned v = get_num_vars(); v-- > 0; ) {
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expr* e = get_expr(v);
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if (seq.is_char(e) && m_var2value[v] == UINT_MAX) {
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d = c;
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while (values.contains(c)) {
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@ -244,8 +266,8 @@ namespace smt {
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}
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}
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TRACE("seq", tout << "fresh: " << mk_pp(e, m) << " := " << c << "\n";);
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for (enode* n : *th.get_enode(v))
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m_var2value[n->get_th_var(th.get_id())] = c;
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for (enode* n : *get_enode(v))
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m_var2value[n->get_th_var(get_id())] = c;
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m_value2var.reserve(c + 1, null_theory_var);
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m_value2var[c] = v;
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values.insert(c);
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return true;
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}
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void seq_char::enforce_bits() {
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void theory_char::enforce_bits() {
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TRACE("seq", tout << "enforce bits\n";);
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for (unsigned v = th.get_num_vars(); v-- > 0; ) {
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expr* e = th.get_expr(v);
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if (seq.is_char(e) && th.get_enode(v)->is_root() && !has_bits(v))
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for (unsigned v = get_num_vars(); v-- > 0; ) {
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expr* e = get_expr(v);
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if (seq.is_char(e) && get_enode(v)->is_root() && !has_bits(v))
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init_bits(v);
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}
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}
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void seq_char::enforce_value_bound(theory_var v) {
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void theory_char::enforce_value_bound(theory_var v) {
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TRACE("seq", tout << "enforce bound " << v << "\n";);
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enode* n = th.ensure_enode(seq.mk_char(seq.max_char()));
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theory_var w = n->get_th_var(th.get_id());
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enode* n = ensure_enode(seq.mk_char(seq.max_char()));
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theory_var w = n->get_th_var(get_id());
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SASSERT(has_bits(w));
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init_bits(v);
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auto const& mbits = get_ebits(w);
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auto const& bits = get_ebits(v);
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expr_ref le(m);
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m_bb.mk_ule(bits.size(), bits.c_ptr(), mbits.c_ptr(), le);
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ctx().assign(th.mk_literal(le), nullptr);
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ctx.assign(mk_literal(le), nullptr);
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++m_stats.m_num_bounds;
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}
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void seq_char::enforce_ackerman(theory_var v, theory_var w) {
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void theory_char::enforce_ackerman(theory_var v, theory_var w) {
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if (v > w)
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std::swap(v, w);
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TRACE("seq", tout << "enforce ackerman " << v << " " << w << "\n";);
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literal eq = th.mk_literal(m.mk_eq(th.get_expr(v), th.get_expr(w)));
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ctx().mark_as_relevant(eq);
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literal eq = mk_literal(m.mk_eq(get_expr(v), get_expr(w)));
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ctx.mark_as_relevant(eq);
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literal_vector lits;
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init_bits(v);
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init_bits(w);
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@ -290,36 +312,49 @@ namespace smt {
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auto& b = get_ebits(w);
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for (unsigned i = a.size(); i-- > 0; ) {
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// eq => a = b
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literal beq = th.mk_eq(a[i], b[i], false);
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literal beq = mk_eq(a[i], b[i], false);
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lits.push_back(~beq);
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ctx().mark_as_relevant(beq);
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ctx().mk_th_axiom(th.get_id(), ~eq, beq);
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ctx.mark_as_relevant(beq);
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ctx.mk_th_axiom(get_id(), ~eq, beq);
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}
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// a = b => eq
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lits.push_back(eq);
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ctx().mk_th_axiom(th.get_id(), lits.size(), lits.c_ptr());
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ctx.mk_th_axiom(get_id(), lits.size(), lits.c_ptr());
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++m_stats.m_num_ackerman;
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}
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unsigned seq_char::get_value(theory_var v) {
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unsigned theory_char::get_value(theory_var v) {
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return m_var2value[v];
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}
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||||
|
||||
bool seq_char::get_value(theory_var v, unsigned& c) {
|
||||
bool theory_char::get_value(theory_var v, unsigned& c) {
|
||||
if (!has_bits(v))
|
||||
return false;
|
||||
auto const & b = get_bits(v);
|
||||
c = 0;
|
||||
unsigned p = 1;
|
||||
for (literal lit : b) {
|
||||
if (ctx().get_assignment(lit) == l_true)
|
||||
if (ctx.get_assignment(lit) == l_true)
|
||||
c += p;
|
||||
p *= 2;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
void seq_char::collect_statistics(::statistics& st) const {
|
||||
// TBD: seq_factory needs to be replaced by a "char_factory" in the case where theory_char is
|
||||
// a stand-alone theory.
|
||||
void theory_char::init_model(model_generator & mg) {
|
||||
m_factory = alloc(seq_factory, get_manager(), get_family_id(), mg.get_model());
|
||||
}
|
||||
|
||||
model_value_proc * theory_char::mk_value(enode * n, model_generator & mg) {
|
||||
unsigned ch = get_value(n->get_th_var(get_id()));
|
||||
app* val = seq.str.mk_char(ch);
|
||||
m_factory->add_trail(val);
|
||||
return alloc(expr_wrapper_proc, val);
|
||||
}
|
||||
|
||||
void theory_char::collect_statistics(::statistics& st) const {
|
||||
st.update("seq char ackerman", m_stats.m_num_ackerman);
|
||||
st.update("seq char bounds", m_stats.m_num_bounds);
|
||||
st.update("seq char2bit", m_stats.m_num_blast);
|
|
@ -19,12 +19,12 @@ Author:
|
|||
#include "ast/seq_decl_plugin.h"
|
||||
#include "ast/bv_decl_plugin.h"
|
||||
#include "ast/rewriter/bit_blaster/bit_blaster.h"
|
||||
#include "model/seq_factory.h"
|
||||
#include "smt/smt_theory.h"
|
||||
|
||||
namespace smt {
|
||||
|
||||
class seq_char {
|
||||
|
||||
class theory_char : public theory {
|
||||
|
||||
struct stats {
|
||||
unsigned m_num_ackerman;
|
||||
|
@ -34,8 +34,6 @@ namespace smt {
|
|||
void reset() { memset(this, 0, sizeof(*this)); }
|
||||
};
|
||||
|
||||
theory& th;
|
||||
ast_manager& m;
|
||||
seq_util seq;
|
||||
vector<literal_vector> m_bits;
|
||||
vector<expr_ref_vector> m_ebits;
|
||||
|
@ -45,10 +43,10 @@ namespace smt {
|
|||
bit_blaster m_bb;
|
||||
stats m_stats;
|
||||
symbol m_bits2char;
|
||||
seq_factory* m_factory { nullptr };
|
||||
|
||||
struct reset_bits;
|
||||
|
||||
context& ctx() const { return th.get_context(); }
|
||||
|
||||
literal_vector const& get_bits(theory_var v);
|
||||
|
||||
|
@ -68,33 +66,30 @@ namespace smt {
|
|||
|
||||
public:
|
||||
|
||||
seq_char(theory& th);
|
||||
theory_char(context& ctx, family_id fid);
|
||||
|
||||
void new_eq_eh(theory_var v1, theory_var v2) override;
|
||||
void new_diseq_eh(theory_var v1, theory_var v2) override;
|
||||
theory * mk_fresh(context * new_ctx) override { return alloc(theory_char, *new_ctx, get_family_id()); }
|
||||
bool internalize_atom(app * atom, bool gate_ctx) override;
|
||||
bool internalize_term(app * term) override;
|
||||
void display(std::ostream& out) const override {}
|
||||
final_check_status final_check_eh() override { return final_check() ? FC_DONE : FC_CONTINUE; }
|
||||
void init_model(model_generator & mg) override;
|
||||
model_value_proc * mk_value(enode * n, model_generator & mg) override;
|
||||
void collect_statistics(::statistics& st) const override;
|
||||
|
||||
// Methods exposed when theory_char is a sub-theory of seq and not a stand-alone theory
|
||||
// ensure coherence for character codes and equalities of shared symbols.
|
||||
bool enabled() const { return m_enabled; }
|
||||
|
||||
bool final_check();
|
||||
// <= atomic constraints on characters
|
||||
void assign_le(theory_var v1, theory_var v2, literal lit);
|
||||
|
||||
// < atomic constraint on characters
|
||||
void assign_lt(theory_var v1, theory_var v2, literal lit);
|
||||
|
||||
void new_const_char(theory_var v, unsigned c);
|
||||
|
||||
// = on characters
|
||||
void new_eq_eh(theory_var v1, theory_var v2);
|
||||
|
||||
// != on characters
|
||||
void new_diseq_eh(theory_var v1, theory_var v2);
|
||||
|
||||
// ensure coherence for character codes and equalities of shared symbols.
|
||||
bool final_check();
|
||||
|
||||
unsigned get_value(theory_var v);
|
||||
|
||||
void internalize_le(literal lit, app* term);
|
||||
|
||||
void collect_statistics(::statistics& st) const;
|
||||
|
||||
void internalize_le(literal lit, app* term);
|
||||
};
|
||||
|
||||
}
|
|
@ -272,7 +272,7 @@ theory_seq::theory_seq(context& ctx):
|
|||
m_autil(m),
|
||||
m_sk(m, m_rewrite),
|
||||
m_ax(*this, m_rewrite),
|
||||
m_char(*this),
|
||||
m_char(ctx, get_family_id()),
|
||||
m_regex(*this),
|
||||
m_arith_value(m),
|
||||
m_trail_stack(*this),
|
||||
|
@ -1812,7 +1812,6 @@ void theory_seq::init_model(model_generator & mg) {
|
|||
}
|
||||
}
|
||||
|
||||
|
||||
class theory_seq::seq_value_proc : public model_value_proc {
|
||||
enum source_t { unit_source, int_source, string_source };
|
||||
theory_seq& th;
|
||||
|
|
|
@ -28,10 +28,10 @@ Revision History:
|
|||
#include "util/obj_ref_hashtable.h"
|
||||
#include "smt/smt_theory.h"
|
||||
#include "smt/smt_arith_value.h"
|
||||
#include "smt/theory_char.h"
|
||||
#include "smt/theory_seq_empty.h"
|
||||
#include "smt/seq_skolem.h"
|
||||
#include "smt/seq_axioms.h"
|
||||
#include "smt/seq_char.h"
|
||||
#include "smt/seq_regex.h"
|
||||
#include "smt/seq_offset_eq.h"
|
||||
|
||||
|
@ -356,7 +356,7 @@ namespace smt {
|
|||
arith_util m_autil;
|
||||
seq_skolem m_sk;
|
||||
seq_axioms m_ax;
|
||||
seq_char m_char;
|
||||
theory_char m_char;
|
||||
seq_regex m_regex;
|
||||
arith_value m_arith_value;
|
||||
th_trail_stack m_trail_stack;
|
||||
|
|
Loading…
Reference in a new issue