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refactor(tvix/eval): retain call frames when entering calls

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This grows the frame stack as the call stack grows, which yields *much*
better user-facing error messages.

I haven't measured the performance impact this has yet, for now I'm
still just trying to add more information to errors and then cut down
again where necessary.

Change-Id: I89f058ef31979edacf4667775d460b60704ce4d7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8334
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Autosubmit: tazjin <tazjin@tvl.su>
This commit is contained in:
Vincent Ambo 2023-03-21 01:13:14 +03:00 committed by tazjin
parent 367a5e9922
commit 2d305fd5b3
1 changed files with 13 additions and 6 deletions
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19
tvix/eval/src/vm/mod.rs
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@ -508,7 +508,7 @@ impl<'o> VM<'o> {
OpCode::OpCall => {
let callable = self.stack_pop();
self.call_value(frame.current_light_span(), Some(frame), callable)?;
self.call_value(frame.current_light_span(), Some((span, frame)), callable)?;
// exit this loop and let the outer loop enter the new call
return Ok(true);
@ -985,7 +985,7 @@ impl<'o> VM<'o> {
fn call_value(
&mut self,
span: LightSpan,
parent: Option<CallFrame>,
parent: Option<(LightSpan, CallFrame)>,
callable: Value,
) -> EvalResult<()> {
match callable {
@ -1002,6 +1002,13 @@ impl<'o> VM<'o> {
// `stack_len - 1`.
let stack_offset = self.stack.len() - 1;
// Reenqueue the parent frame, which should only have
// `OpReturn` left. Not throwing it away leads to more
// useful error traces.
if let Some((parent_span, parent_frame)) = parent {
self.push_call_frame(parent_span, parent_frame);
}
self.push_call_frame(
span,
CallFrame {
@ -1017,11 +1024,11 @@ impl<'o> VM<'o> {
// Attribute sets with a __functor attribute are callable.
val @ Value::Attrs(_) => {
let gen_span = parent
.map(|p| p.current_light_span())
.unwrap_or_else(|| self.reasonable_light_span());
if let Some((parent_span, parent_frame)) = parent {
self.push_call_frame(parent_span, parent_frame);
}
self.enqueue_generator("__functor call", gen_span, |co| call_functor(co, val));
self.enqueue_generator("__functor call", span, |co| call_functor(co, val));
Ok(())
}
v => Err(ErrorKind::NotCallable(v.type_of())).with_span(&span, self),