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add z3str2-style free variable check to theory_str

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This commit is contained in:
Murphy Berzish 2016-11-11 17:52:18 -05:00
parent fbaee080b2
commit 02aacab04e
1 changed files with 45 additions and 17 deletions
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62
src/smt/theory_str.cpp
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@ -7811,26 +7811,54 @@ final_check_status theory_str::final_check_eh() {
return FC_DONE;
}
// Check every variable to see if it's eq. to some string constant.
// If not, mark it as free.
bool needToAssignFreeVars = false;
std::set<expr*> free_variables;
std::set<expr*> unused_internal_variables;
TRACE("t_str_detail", tout << variable_set.size() << " variables in variable_set" << std::endl;);
for (std::set<expr*>::iterator it = variable_set.begin(); it != variable_set.end(); ++it) {
TRACE("t_str_detail", tout << "checking eqc of variable " << mk_ismt2_pp(*it, m) << std::endl;);
bool has_eqc_value = false;
get_eqc_value(*it, has_eqc_value);
if (!has_eqc_value) {
// if this is an internal variable, it can be ignored...I think
if (internal_variable_set.find(*it) != internal_variable_set.end() || regex_variable_set.find(*it) != regex_variable_set.end()) {
TRACE("t_str_detail", tout << "WARNING: free internal variable " << mk_ismt2_pp(*it, m) << std::endl;);
//unused_internal_variables.insert(*it);
} else {
needToAssignFreeVars = true;
free_variables.insert(*it);
}
}
if (true) { // Z3str2 free variables check
std::map<expr*, int>::iterator itor = varAppearInAssign.begin();
for (; itor != varAppearInAssign.end(); ++itor) {
/*
std::string vName = std::string(Z3_ast_to_string(ctx, itor->first));
if (vName.length() >= 3 && vName.substr(0, 3) == "$$_")
continue;
*/
if (internal_variable_set.find(itor->first) != internal_variable_set.end()
|| regex_variable_set.find(itor->first) != regex_variable_set.end()) {
// this can be ignored, I think
TRACE("t_str_detail", tout << "free internal variable " << mk_pp(itor->first, m) << " ignored" << std::endl;);
continue;
}
bool hasEqcValue = false;
expr * eqcString = get_eqc_value(itor->first, hasEqcValue);
if (!hasEqcValue) {
TRACE("t_str_detail", tout << "found free variable " << mk_pp(itor->first, m) << std::endl;);
needToAssignFreeVars = true;
free_variables.insert(itor->first);
// break;
} else {
// debug
TRACE("t_str_detail", tout << "variable " << mk_pp(itor->first, m) << " = " << mk_pp(eqcString, m) << std::endl;);
}
}
} else { // new, possibly incorrect free variables check
// Check every variable to see if it's eq. to some string constant.
// If not, mark it as free.
TRACE("t_str_detail", tout << variable_set.size() << " variables in variable_set" << std::endl;);
for (std::set<expr*>::iterator it = variable_set.begin(); it != variable_set.end(); ++it) {
TRACE("t_str_detail", tout << "checking eqc of variable " << mk_ismt2_pp(*it, m) << std::endl;);
bool has_eqc_value = false;
get_eqc_value(*it, has_eqc_value);
if (!has_eqc_value) {
// if this is an internal variable, it can be ignored...I think
if (internal_variable_set.find(*it) != internal_variable_set.end() || regex_variable_set.find(*it) != regex_variable_set.end()) {
TRACE("t_str_detail", tout << "WARNING: free internal variable " << mk_ismt2_pp(*it, m) << std::endl;);
//unused_internal_variables.insert(*it);
} else {
needToAssignFreeVars = true;
free_variables.insert(*it);
}
}
}
}
if (!needToAssignFreeVars) {