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Fixed iterator invalidation bug in theory_arith_nl.

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Indirectly relates to #740
This commit is contained in:
Christoph M. Wintersteiger 2016-10-18 17:17:19 +01:00
parent 9fef51553c
commit 4546915238
1 changed files with 13 additions and 4 deletions
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17
src/smt/theory_arith_nl.h
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@ -965,10 +965,19 @@ namespace smt {
bool theory_arith<Ext>::propagate_linear_monomials() {
TRACE("non_linear", tout << "propagating linear monomials...\n";);
bool p = false;
svector<theory_var>::const_iterator it = m_nl_monomials.begin();
svector<theory_var>::const_iterator end = m_nl_monomials.end();
for (; it != end; ++it) {
theory_var v = *it;
// CMW: m_nl_monomials is sometimes modified while executing
// propagate_linear_monomial(...), invalidating the iterator `it'.
// (Via the relevancy propagation that internalizes a new axiom
// in mk_div_axiom and possibly others.) I'm replacing the iterator
// with an index `i'.
// Was previously:
// svector<theory_var>::const_iterator it = m_nl_monomials.begin();
// svector<theory_var>::const_iterator end = m_nl_monomials.end();
// for (; it != end; ++it) {
// theory_var v = *it;
for (unsigned i = 0; i < m_nl_monomials.size(); i++) {
theory_var v = m_nl_monomials[i];
if (propagate_linear_monomial(v))
p = true;
}