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probably fix duplication of mk_string() terms

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also implement Case 2 of solve_concat_eq_str()
This commit is contained in:
Murphy Berzish 2015-09-28 14:44:25 -04:00
parent 9bc685b21d
commit 876af399e3
3 changed files with 63 additions and 5 deletions
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39
src/smt/theory_str.cpp
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@ -468,11 +468,48 @@ void theory_str::solve_concat_eq_str(expr * concat, expr * str) {
expr_ref equality(ctx.mk_eq_atom(concat, str), m);
expr_ref diseq(m.mk_not(equality), m);
assert_axiom(diseq);
return;
}
} else if (!arg1_has_eqc_value && arg2_has_eqc_value) {
// Case 2: Concat(var, const) == const
TRACE("t_str", tout << "Case 2: Concat(var, const) == const" << std::endl;);
NOT_IMPLEMENTED_YET();
const char * str2;
m_strutil.is_string(arg2, & str2);
std::string arg2_str(str2);
int resultStrLen = const_str.length();
int arg2StrLen = arg2_str.length();
if (resultStrLen < arg2StrLen) {
// Inconsistency
TRACE("t_str", tout << "inconsistency detected: \""
<< arg2_str <<
"\" is longer than \"" << const_str << "\","
<< " so cannot be concatenated with anything to form it" << std::endl;);
expr_ref equality(ctx.mk_eq_atom(newConcat, str), m);
expr_ref diseq(m.mk_not(equality), m);
assert_axiom(diseq);
return;
} else {
int varStrLen = resultStrLen - arg2StrLen;
std::string firstPart = const_str.substr(0, varStrLen);
std::string secondPart = const_str.substr(varStrLen, arg2StrLen);
if (arg2_str != secondPart) {
// Inconsistency
TRACE("t_str", tout << "inconsistency detected: "
<< "suffix of concatenation result expected \"" << secondPart << "\", "
<< "actually \"" << arg2_str << "\""
<< std::endl;);
expr_ref equality(ctx.mk_eq_atom(newConcat, str), m);
expr_ref diseq(m.mk_not(equality), m);
assert_axiom(diseq);
return;
} else {
expr_ref tmpStrConst(m_strutil.mk_string(firstPart), m);
expr_ref premise(ctx.mk_eq_atom(newConcat, str), m);
expr_ref conclusion(ctx.mk_eq_atom(arg1, tmpStrConst), m);
assert_implication(premise, conclusion);
return;
}
}
} else if (arg1_has_eqc_value && !arg2_has_eqc_value) {
// Case 3: Concat(const, var) == const
TRACE("t_str", tout << "Case 3: Concat(const, var) == const" << std::endl;);