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z3str3: improve implementation of int.to.str reduction

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This commit is contained in:
Murphy Berzish 2020-02-28 19:09:14 -05:00 • committed by Nikolaj Bjorner
parent 8881084449
commit 069a5fba16
1 changed files with 17 additions and 1 deletions
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18
src/smt/theory_str_mc.cpp
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@ -721,19 +721,35 @@ namespace smt {
if (!iValue_exists) {
NOT_IMPLEMENTED_YET(); // TODO force assignment in arith solver
}
rational termLen;
bool termLen_exists = v.get_value(mk_strlen(term), termLen);
if(!termLen_exists) {
NOT_IMPLEMENTED_YET(); // TODO force assignment in arith solver
}
TRACE("str_fl", tout << "reduce int.to.str: n=" << iValue << std::endl;);
if (iValue.is_neg()) {
if (!termLen.is_zero()) {
// conflict
cex = expr_ref(m.mk_not(m.mk_and(m_autil.mk_le(arg0, mk_int(-1)), m.mk_not(mk_strlen(term)))), m);
return false;
}
// return the empty string
eqc_chars.reset();
return true;
} else {
if (termLen.get_unsigned() != iValue.to_string().length()) {
// conflict
cex = expr_ref(m.mk_not(m.mk_and(get_context().mk_eq_atom(mk_strlen(term), mk_int(termLen)), get_context().mk_eq_atom(arg0, mk_int(iValue)))), m);
return false;
}
// convert iValue to a constant
zstring iValue_str = zstring(iValue.to_string().c_str());
for (unsigned idx = 0; idx < iValue_str.length(); ++idx) {
expr_ref chTerm(bitvector_character_constants.get(iValue_str[idx]), sub_m);
eqc_chars.push_back(chTerm);
}
return true;
}
return true;
} else {
TRACE("str_fl", tout << "string term " << mk_pp(term, m) << " handled as uninterpreted function" << std::endl;);
if (!uninterpreted_to_char_subterm_map.contains(term)) {