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fix(tvix/eval): ensure OpResolveWith can be traced

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The previous implementation of OpResolveWith manually controlled the
loop iteration, which skipped over the disassembler's tracing
instruction.

Instead, the resolution of dynamic variables has been delegated to a
new helper function. This has the additional benefit that the loop
labels are no longer required, making things a bit cleaner.

Change-Id: If22b74c3d49c74bf3a1ec4497cb761a9ee6cf2a4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6298
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
This commit is contained in:
Vincent Ambo 2022-08-27 03:17:18 +03:00 committed by tazjin
parent 7c2fdefcd8
commit 10b0879c00
1 changed files with 16 additions and 16 deletions
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32
tvix/eval/src/vm.rs
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@ -126,7 +126,7 @@ impl VM {
#[cfg(feature = "disassembler")]
let mut tracer = Tracer::new();
'dispatch: loop {
loop {
if self.frame().ip == self.chunk().code.len() {
// If this is the end of the top-level function,
// return, otherwise pop the call frame.
@ -330,21 +330,8 @@ impl VM {
OpCode::OpResolveWith => {
let ident = self.pop().to_string()?;
// Attempt to resolve the variable, starting at
// the back of the with_stack.
'with: for idx in self.with_stack.iter().rev() {
let with = self.stack[*idx].as_attrs()?;
match with.select(ident.as_str()) {
None => continue 'with,
Some(val) => {
self.push(val.clone());
continue 'dispatch;
}
}
}
return Err(ErrorKind::UnknownDynamicVariable(ident.to_string()).into());
let value = self.resolve_with(ident.as_str())?;
self.push(value)
}
OpCode::OpAssert => {
@ -450,6 +437,19 @@ impl VM {
self.push(Value::String(out.into()));
Ok(())
}
/// Resolve a dynamic identifier through the with-stack at runtime.
fn resolve_with(&self, ident: &str) -> EvalResult<Value> {
for idx in self.with_stack.iter().rev() {
let with = self.stack[*idx].as_attrs()?;
match with.select(ident) {
None => continue,
Some(val) => return Ok(val.clone()),
}
}
Err(ErrorKind::UnknownDynamicVariable(ident.to_string()).into())
}
}
// TODO: use Rc::unwrap_or_clone once it is stabilised.