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fix infinite loop in traversing equivalence class, #1274, still requires addressing MBQI

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-11-15 21:17:00 -08:00
parent f47671931f
commit c3f67f3b5f
4 changed files with 24 additions and 8 deletions
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2
src/smt/smt_context.cpp
View file

@ -4373,7 +4373,7 @@ namespace smt {
void context::add_rec_funs_to_model() {
ast_manager& m = m_manager;
SASSERT(m_model);
for (unsigned i = 0; i < m_asserted_formulas.get_num_formulas(); ++i) {
for (unsigned i = 0; !get_cancel_flag() && i < m_asserted_formulas.get_num_formulas(); ++i) {
expr* e = m_asserted_formulas.get_formula(i);
if (is_quantifier(e)) {
TRACE("context", tout << mk_pp(e, m) << "\n";);

7
src/smt/smt_context.h
View file

@ -209,7 +209,12 @@ namespace smt {
~scoped_mk_model() {
if (m_ctx.m_proto_model.get() != 0) {
m_ctx.m_model = m_ctx.m_proto_model->mk_model();
m_ctx.add_rec_funs_to_model();
try {
m_ctx.add_rec_funs_to_model();
}
catch (...) {
// no op
}
m_ctx.m_proto_model = 0; // proto_model is not needed anymore.
}
}

19
src/smt/theory_str.cpp
View file

@ -47,6 +47,8 @@ namespace smt {
sLevel(0),
finalCheckProgressIndicator(false),
m_trail(m),
m_factory(nullptr),
m_unused_id(0),
m_delayed_axiom_setup_terms(m),
tmpStringVarCount(0),
tmpXorVarCount(0),
@ -4648,14 +4650,17 @@ namespace smt {
// We only check m_find for a string constant.
expr * theory_str::z3str2_get_eqc_value(expr * n , bool & hasEqcValue) {
expr * curr = n;
theory_var curr = m_find.find(get_var(n));
theory_var first = curr;
do {
if (u.str.is_string(curr)) {
expr* a = get_ast(curr);
if (u.str.is_string(a)) {
hasEqcValue = true;
return curr;
return a;
}
curr = get_eqc_next(curr);
} while (curr != n);
curr = m_find.next(curr);
}
while (curr != first && curr != null_theory_var);
hasEqcValue = false;
return n;
}
@ -10584,7 +10589,9 @@ namespace smt {
return alloc(expr_wrapper_proc, val);
} else {
TRACE("str", tout << "WARNING: failed to find a concrete value, falling back" << std::endl;);
return alloc(expr_wrapper_proc, to_app(mk_string("**UNUSED**")));
std::ostringstream unused;
unused << "**UNUSED**" << (m_unused_id++);
return alloc(expr_wrapper_proc, to_app(mk_string(unused.str().c_str())));
}
}

4
src/smt/theory_str.h
View file

@ -267,6 +267,10 @@ protected:
str_value_factory * m_factory;
// Unique identifier appended to unused variables to ensure that model construction
// does not introduce equalities when they weren't enforced.
unsigned m_unused_id;
// terms we couldn't go through set_up_axioms() with because they weren't internalized
expr_ref_vector m_delayed_axiom_setup_terms;