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fix #2533

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-09-03 23:47:25 -07:00
parent 9fce5e124f
commit 8f4e7f4961
2 changed files with 30 additions and 11 deletions
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2
src/ast/for_each_expr.cpp
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@ -87,7 +87,7 @@ subterms::iterator& subterms::iterator::operator++() {
m_es.push_back(arg); m_es.push_back(arg);
} }
} }
while (m_visited.is_marked(m_es.back())) { while (!m_es.empty() && m_visited.is_marked(m_es.back())) {
m_es.pop_back(); m_es.pop_back();
} }
return *this; return *this;

39
src/ast/rewriter/seq_rewriter.cpp
View file

@ -547,7 +547,7 @@ br_status seq_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
case _OP_STRING_STRIDOF: case _OP_STRING_STRIDOF:
UNREACHABLE(); UNREACHABLE();
} }
CTRACE("seq_verbose", st != BR_FAILED, tout << result << "\n";); CTRACE("seq_verbose", st != BR_FAILED, tout << f->get_name() << " " << result << "\n";);
return st; return st;
} }
@ -1142,16 +1142,35 @@ br_status seq_rewriter::mk_seq_replace(expr* a, expr* b, expr* c, expr_ref& resu
result = m_util.str.mk_concat(c, a); result = m_util.str.mk_concat(c, a);
return BR_REWRITE1; return BR_REWRITE1;
} }
if (m_util.str.is_string(b, s2)) { m_lhs.reset();
m_lhs.reset(); m_util.str.get_concat(a, m_lhs);
m_util.str.get_concat(a, m_lhs);
if (!m_lhs.empty() && m_util.str.is_string(m_lhs.get(0), s1) && // a = "", |b| > 0 -> replace("",b,c) = ""
s1.contains(s2)) { if (m_lhs.empty()) {
m_lhs[0] = m_util.str.mk_string(s1.replace(s2, s3)); unsigned len = 0;
result = m_util.str.mk_concat(m_lhs.size(), m_lhs.c_ptr()); m_util.str.get_concat(b, m_lhs);
return BR_REWRITE1; min_length(m_lhs.size(), m_lhs.c_ptr(), len);
if (len > 0) {
result = a;
return BR_DONE;
} }
return BR_FAILED;
}
// a := b + rest
if (m_lhs.get(0) == b) {
m_lhs[0] = c;
result = m_util.str.mk_concat(m_lhs.size(), m_lhs.c_ptr());
return BR_REWRITE1;
}
// a : a' + rest string, b is string, c is string, a' contains b
if (m_util.str.is_string(b, s2) && m_util.str.is_string(c, s3) &&
m_util.str.is_string(m_lhs.get(0), s1) && s1.contains(s2) ) {
m_lhs[0] = m_util.str.mk_string(s1.replace(s2, s3));
result = m_util.str.mk_concat(m_lhs.size(), m_lhs.c_ptr());
return BR_REWRITE1;
} }
return BR_FAILED; return BR_FAILED;