void CAtom::remove_guard( CAtom** ptr )
{
if( !*ptr )
return;
GuardMap* map = guard_map();
if( !map || map->empty() )
return;
bool more = false; // if the CAtom has more pointers attached to it.
GuardMap::iterator it = map->find( *ptr );
const GuardMap::iterator end = map->end();
for( ; it != end && it->first == *ptr; ++it )
{
if( it->second == ptr )
{
if( !more )
{
++it;
more = ( it != end ) && ( it->first == *ptr );
--it;
}
map->erase( it );
break;
}
more = true;
}
if( !more )
( *ptr )->set_has_guards( false );
}
z3::expr Z3AssumptionSolverImpl::getAssumption(ref<Expr> assertion) {
GuardMap::iterator it = guards_.find(assertion);
if (it != guards_.end()) {
return it->second;
}
char name[16];
snprintf(name, 16, "g%lu", guard_counter_++);
z3::expr result = context_.bool_const(name);
guards_.insert(std::make_pair(assertion, result));
solver_.add(z3::to_expr(context_,
Z3_mk_implies(context_, result, builder_->construct(assertion))));
return result;
}
void CAtom::clear_guards( CAtom* o )
{
GuardMap* map = 0;
try
{
map = guard_map();
}
catch( std::bad_alloc& )
{
// do nothing in case of OOM - code below is safe
}
if( !map || map->empty() )
return;
GuardMap::iterator it = map->find( o );
GuardMap::iterator first = it;
const GuardMap::iterator end = map->end();
for( ; it != end && it->first == o; ++it )
*it->second = 0;
map->erase( first, it );
o->set_has_guards( false );
}