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binding attributed variables more eagerly after each implementation of verify_attributes/3 has been called (#248)

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This commit is contained in:
Mark Thom
2019-12-05 00:33:46 -07:00
parent 9ae029b04d
commit 018b076835
5 changed files with 49 additions and 16 deletions
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29
src/prolog/machine/system_calls.rs
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@@ -1644,11 +1644,32 @@ impl MachineState {
}
};
}
&SystemClauseType::RedoAttrVarBindings => {
let bindings = mem::replace(&mut self.attr_var_init.bindings, vec![]);
&SystemClauseType::ClearAttrVarBindings => {
self.attr_var_init.bindings.clear();
}
&SystemClauseType::RedoAttrVarBinding => {
let var = self.store(self.deref(self[temp_v!(1)].clone()));
let value = self.store(self.deref(self[temp_v!(2)].clone()));
for (h, addr) in bindings {
self.heap[h] = HeapCellValue::Addr(addr);
match var {
Addr::AttrVar(h) => {
if let Addr::AttrVar(h1) = value {
self.heap[h] = HeapCellValue::Addr(Addr::AttrVar(h1));
// append h's attributes list to h1's.
let mut l = h1 + 1;
while let Addr::Lis(l1) = self.store(self.deref(self.heap[l].as_addr(l))) {
l = l1 + 1;
}
self.heap[l] = HeapCellValue::Addr(Addr::HeapCell(h + 1));
self.trail(TrailRef::Ref(Ref::HeapCell(l)));
} else {
self.heap[h] = HeapCellValue::Addr(value);
}
}
_ => unreachable!()
}
}
&SystemClauseType::ResetGlobalVarAtKey => {