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correct clause/2 to work only on properly scoped terms

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This commit is contained in:
Mark Thom
2019-03-07 22:55:54 -07:00
parent b1e47cc465
commit 933c19c317
1 changed files with 8 additions and 3 deletions
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11
src/prolog/machine/system_calls.rs
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@@ -873,20 +873,25 @@ impl MachineState {
&SystemClauseType::GetClause => {
let head = self[temp_v!(1)].clone();
let subsection = match self.store(self.deref(head)) {
let (module, subsection) = match self.store(self.deref(head)) {
Addr::Str(s) =>
match self.heap[s].clone() {
HeapCellValue::NamedStr(arity, name, ..) =>
indices.get_clause_subsection(name, arity),
(name.owning_module(), indices.get_clause_subsection(name, arity)),
_ => unreachable!()
},
Addr::Con(Constant::Atom(name, _)) =>
indices.get_clause_subsection(name, 0),
(name.owning_module(), indices.get_clause_subsection(name, 0)),
_ => unreachable!()
};
match subsection {
Some(dynamic_predicate_info) => {
if dynamic_predicate_info.module_src != module {
self.fail = true;
return Ok(());
}
self.execute_at_index(2, dynamic_predicate_info.clauses_subsection_p);
return Ok(());
},