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[spacer] implement spacer::is_clause() (#4170)

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Spacer has a different defintion of is_clause() than ast_util.
It is currently only used in assertions.

Main difference:
  x=y
where x and y are Bool atoms is considered to be an atom, so that
(or (= x y) (not (= z y)))
is a literal

Co-authored-by: Arie Gurfinkel <arie.gurfinkel@uwaterloo.ca>
This commit is contained in:
Hari Govind V K 2020-04-30 17:03:48 -04:00 • committed by GitHub
parent 799b6131f2
commit dbfa3dd7f1
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4 changed files with 48 additions and 4 deletions
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6
src/muz/spacer/spacer_context.cpp
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@ -926,8 +926,10 @@ void pred_transformer::add_lemma_core(lemma* lemma, bool ground_only)
SASSERT(!lemma->is_background());
unsigned lvl = lemma->level();
expr* l = lemma->get_expr();
SASSERT(!lemma->is_ground() || is_clause(m, l));
SASSERT(!is_quantifier(l) || is_clause(m, to_quantifier(l)->get_expr()));
CTRACE("spacer", !spacer::is_clause(m, l),
tout << "Lemma not a clause: " << mk_pp(l, m) << "\n";);
SASSERT(!lemma->is_ground() || spacer::is_clause(m, l));
SASSERT(!is_quantifier(l) || spacer::is_clause(m, to_quantifier(l)->get_expr()));
get_context().log_add_lemma(*this, *lemma);