rishi/scryer-prolog
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fix list copying

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This commit is contained in:
Mark Thom
2019-12-01 15:28:47 -07:00
parent 406d3520f1
commit c362cc6d34
1 changed files with 21 additions and 3 deletions
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24
src/prolog/machine/copier.rs
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@@ -71,13 +71,31 @@ impl<T: CopierTarget> CopyTermState<T> {
*self.value_at_scan() = HeapCellValue::Addr(Addr::Lis(threshold));
let hcv = self.target[addr].clone();
self.target.push(hcv);
let ra = hcv.as_addr(threshold);
let rd = self.target.store(self.target.deref(ra));
self.target.push(hcv);
let hcv = self.target[addr + 1].clone();
self.target.push(hcv);
self.trail.push((Ref::HeapCell(addr), self.target[addr].clone()));
self.target[addr] = HeapCellValue::Addr(Addr::Lis(threshold));
match rd.clone() {
Addr::AttrVar(h) | Addr::HeapCell(h) if h >= self.old_h => {
self.target[threshold] = HeapCellValue::Addr(rd)
}
ra @ Addr::AttrVar(_) | ra @ Addr::HeapCell(..) | ra @ Addr::StackCell(..) => {
if ra == rd {
self.reinstantiate_var(ra, threshold);
} else {
self.target[threshold] = HeapCellValue::Addr(ra);
}
}
_ => {
self.trail.push((Ref::HeapCell(addr), self.target[addr].clone()));
self.target[addr] = HeapCellValue::Addr(Addr::Lis(threshold))
}
};
self.scan += 1;
}