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fix partial_string_tail panic (#530)

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This commit is contained in:
Mark Thom
2020-05-18 11:14:27 -06:00
parent eecd809d9a
commit c14259060c
2 changed files with 15 additions and 4 deletions
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4
src/prolog/machine/compile.rs
View File

@@ -348,7 +348,9 @@ fn compile_into_module(
);
match compile_into_module_impl(wam, &mut compiler, module, src, indices) {
Ok(()) => EvalSession::EntrySuccess,
Ok(()) => {
EvalSession::EntrySuccess
}
Err(e) => {
compiler.drop_expansions(&mut wam.code_repo);
EvalSession::from(e)

15
src/prolog/machine/system_calls.rs
View File

@@ -1154,10 +1154,19 @@ impl MachineState {
match pstr {
Addr::PStrLocation(h, _) => {
let tail = self.heap[h + 1].as_addr(h + 1);
let target = self[temp_v!(2)];
if let HeapCellValue::PartialString(_, true) = &self.heap[h] {
let tail = self.heap[h + 1].as_addr(h + 1);
let target = self[temp_v!(2)];
self.unify(tail, target);
self.unify(tail, target);
} else {
self.fail = true;
return Ok(());
}
}
Addr::EmptyList => {
self.fail = true;
return Ok(());
}
_ => {
unreachable!()