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prevent assertion of basic string axioms on variables that go out of scope (theory_str)

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this is testing a crash avoidance feature, the regression is tests/z3str/regex-026.smt2

this also adds some debugging code for a substr() crash but that is WIP
This commit is contained in:
Murphy Berzish 2016-07-06 17:31:37 -04:00
parent 7d903ff1fa
commit 9eead64d03
1 changed files with 26 additions and 1 deletions
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27
src/smt/theory_str.cpp
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@ -799,6 +799,13 @@ void theory_str::instantiate_basic_string_axioms(enode * str) {
context & ctx = get_context();
ast_manager & m = get_manager();
// TESTING: attempt to avoid a crash here when a variable goes out of scope
// TODO this seems to work so we probably need to do this for other propagate checks, etc.
if (str->get_iscope_lvl() > ctx.get_scope_level()) {
TRACE("t_str_detail", tout << "WARNING: skipping axiom setup on out-of-scope string term" << std::endl;);
return;
}
// generate a stronger axiom for constant strings
app * a_str = str->get_owner();
if (m_strutil.is_string(str->get_owner())) {
@ -1400,6 +1407,7 @@ void theory_str::reset_eh() {
m_basicstr_axiom_todo.reset();
m_str_eq_todo.reset();
m_concat_axiom_todo.reset();
// TODO reset a loooooot more internal stuff
pop_scope_eh(get_context().get_scope_level());
}
@ -2714,8 +2722,25 @@ void theory_str::process_concat_eq_type2(expr * concatAst1, expr * concatAst2) {
l_count = 2;
lenDelta = str_len - y_len;
}
TRACE("t_str",
tout
<< "xLen? " << (x_len_exists ? "yes" : "no") << std::endl
<< "mLen? " << (m_len_exists ? "yes" : "no") << std::endl
<< "yLen? " << (y_len_exists ? "yes" : "no") << std::endl
<< "xLen = " << x_len.to_string() << std::endl
<< "yLen = " << y_len.to_string() << std::endl
<< "mLen = " << m_len.to_string() << std::endl
<< "strLen = " << str_len.to_string() << std::endl
<< "lenDelta = " << lenDelta.to_string() << std::endl
<< "strValue = \"" << strValue << "\" (len=" << strValue.length() << ")" << std::endl
;
);
TRACE("t_str", tout << "*** MARKER 1 ***" << std::endl;);
std::string part1Str = strValue.substr(0, lenDelta.get_unsigned());
TRACE("t_str", tout << "*** MARKER 2 ***" << std::endl;);
std::string part2Str = strValue.substr(lenDelta.get_unsigned(), strValue.length() - lenDelta.get_unsigned());
TRACE("t_str", tout << "*** MARKER 3 ***" << std::endl;);
expr_ref prefixStr(m_strutil.mk_string(part1Str), mgr);
expr_ref x_concat(mk_concat(m, prefixStr), mgr);
@ -5495,7 +5520,7 @@ final_check_status theory_str::final_check_eh() {
}
TRACE("t_str", tout << "final check" << std::endl;);
TRACE("t_str_detail", dump_assignments(););
TRACE("t_str_dump_assign", dump_assignments(););
// run dependence analysis to find free string variables
std::map<expr*, int> varAppearInAssign;