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fix #2762, fix #2750, add iterative unrolling to help on termination on sat instances (to address non-termination in #2759 and #2762)

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-11-30 18:05:24 -08:00
parent 0d004b5232
commit 489448b869
3 changed files with 55 additions and 46 deletions
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src/ast/seq_decl_plugin.h
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@ -154,6 +154,7 @@ class seq_decl_plugin : public decl_plugin {
sort* m_char;
sort* m_re;
bool m_has_re;
bool m_has_seq;
void match(psig& sig, unsigned dsz, sort* const* dom, sort* range, sort_ref& rng);
@ -206,6 +207,7 @@ public:
app* mk_string(zstring const& s);
bool has_re() const { return m_has_re; }
bool has_seq() const { return m_has_seq; }
bool is_considered_uninterpreted(func_decl * f) override;
};
@ -237,6 +239,7 @@ public:
bool is_skolem(expr const* e) const { return is_app_of(e, m_fid, _OP_SEQ_SKOLEM); }
bool has_re() const { return seq.has_re(); }
bool has_seq() const { return seq.has_seq(); }
class str {
seq_util& u;