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Merge pull request #4101 from mtrberzi/int-to-str-leading-zeroes

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z3str3: disallow leading zeroes in int-to-string conversion
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Murphy Berzish 2020-04-29 10:13:10 -05:00 • committed by GitHub
commit 0fb6a7c5d8
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1 changed files with 9 additions and 1 deletions
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10
src/smt/theory_str.cpp
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@ -8933,11 +8933,19 @@ namespace smt {
if (Sval_expr_exists) {
zstring Sval;
u.str.is_string(Sval_expr, Sval);
TRACE("str", tout << "string theory assigns \"" << mk_pp(a, m) << " = " << Sval << "\n";);
TRACE("str", tout << "string theory assigns " << mk_pp(a, m) << " = \"" << Sval << "\"\n";);
// empty string --> integer value < 0
if (Sval.empty()) {
// ignore this. we should already assert the axiom for what happens when the string is ""
} else {
// check for leading zeroes. if the first character is '0', the entire string must be "0"
char firstChar = (int)Sval[0];
if (firstChar == '0' && !(Sval == zstring("0"))) {
TRACE("str", tout << "str.to-int argument " << Sval << " contains leading zeroes" << std::endl;);
expr_ref axiom(m.mk_not(ctx.mk_eq_atom(a, mk_string(Sval))), m);
assert_axiom(axiom);
return true;
}
// nonempty string --> convert to correct integer value, or disallow it
rational convertedRepresentation(0);
rational ten(10);