diff options
Diffstat (limited to 'tvix/eval/src')
| -rw-r--r-- | tvix/eval/src/errors.rs | 25 | ||||
| -rw-r--r-- | tvix/eval/src/value/mod.rs | 5 | ||||
| -rw-r--r-- | tvix/eval/src/value/thunk.rs | 14 | ||||
| -rw-r--r-- | tvix/eval/src/vm/generators.rs | 16 | ||||
| -rw-r--r-- | tvix/eval/src/vm/mod.rs | 5 |
5 files changed, 48 insertions, 17 deletions
diff --git a/tvix/eval/src/errors.rs b/tvix/eval/src/errors.rs index 5e890c68a74c..76a3da3ff52f 100644 --- a/tvix/eval/src/errors.rs +++ b/tvix/eval/src/errors.rs @@ -77,7 +77,9 @@ pub enum ErrorKind { NotCallable(&'static str), /// Infinite recursion encountered while forcing thunks. - InfiniteRecursion, + InfiniteRecursion { + first_force: Span, + }, ParseErrors(Vec<rnix::parser::ParseError>), @@ -354,7 +356,7 @@ to a missing value in the attribute set(s) included via `with`."#, ) } - ErrorKind::InfiniteRecursion => write!(f, "infinite recursion encountered"), + ErrorKind::InfiniteRecursion { .. } => write!(f, "infinite recursion encountered"), // Errors themselves ignored here & handled in Self::spans instead ErrorKind::ParseErrors(_) => write!(f, "failed to parse Nix code:"), @@ -754,7 +756,7 @@ impl Error { | ErrorKind::UnknownDynamicVariable(_) | ErrorKind::VariableAlreadyDefined(_) | ErrorKind::NotCallable(_) - | ErrorKind::InfiniteRecursion + | ErrorKind::InfiniteRecursion { .. } | ErrorKind::ParseErrors(_) | ErrorKind::NativeError { .. } | ErrorKind::BytecodeError(_) @@ -797,7 +799,7 @@ impl Error { ErrorKind::UnknownDynamicVariable(_) => "E011", ErrorKind::VariableAlreadyDefined(_) => "E012", ErrorKind::NotCallable(_) => "E013", - ErrorKind::InfiniteRecursion => "E014", + ErrorKind::InfiniteRecursion { .. } => "E014", ErrorKind::ParseErrors(_) => "E015", ErrorKind::DuplicateAttrsKey { .. } => "E016", ErrorKind::NotCoercibleToString { .. } => "E018", @@ -869,6 +871,21 @@ impl Error { ] } + ErrorKind::InfiniteRecursion { first_force } => { + vec![ + SpanLabel { + label: Some("first requested here".into()), + span: *first_force, + style: SpanStyle::Secondary, + }, + SpanLabel { + label: Some("requested again here".into()), + span: self.span, + style: SpanStyle::Primary, + }, + ] + } + // All other errors pretty much have the same shape. _ => { vec![SpanLabel { diff --git a/tvix/eval/src/value/mod.rs b/tvix/eval/src/value/mod.rs index f57cfda5eecf..77d40b0e3906 100644 --- a/tvix/eval/src/value/mod.rs +++ b/tvix/eval/src/value/mod.rs @@ -22,6 +22,7 @@ mod thunk; use crate::errors::ErrorKind; use crate::opcode::StackIdx; +use crate::spans::LightSpan; use crate::vm::generators::{self, GenCo}; use crate::AddContext; pub use attrs::NixAttrs; @@ -611,9 +612,9 @@ impl Value { } // TODO(amjoseph): de-asyncify this (when called directly by the VM) - pub async fn force(self, co: GenCo) -> Result<Value, ErrorKind> { + pub async fn force(self, co: GenCo, span: LightSpan) -> Result<Value, ErrorKind> { if let Value::Thunk(thunk) = self { - return thunk.force(co).await; + return thunk.force(co, span).await; } Ok(self) diff --git a/tvix/eval/src/value/thunk.rs b/tvix/eval/src/value/thunk.rs index f2959ba15c74..0290e73ebb7d 100644 --- a/tvix/eval/src/value/thunk.rs +++ b/tvix/eval/src/value/thunk.rs @@ -65,7 +65,7 @@ enum ThunkRepr { /// Thunk currently under-evaluation; encountering a blackhole /// value means that infinite recursion has occured. - Blackhole, + Blackhole { forced_at: LightSpan }, /// Fully evaluated thunk. Evaluated(Value), @@ -75,7 +75,7 @@ impl ThunkRepr { fn debug_repr(&self) -> String { match self { ThunkRepr::Evaluated(v) => format!("thunk(val|{})", v), - ThunkRepr::Blackhole => "thunk(blackhole)".to_string(), + ThunkRepr::Blackhole { .. } => "thunk(blackhole)".to_string(), ThunkRepr::Native(_) => "thunk(native)".to_string(), ThunkRepr::Suspended { lambda, .. } => format!("thunk({:p})", *lambda), } @@ -114,7 +114,7 @@ impl Thunk { } // TODO(amjoseph): de-asyncify this - pub async fn force(self, co: GenCo) -> Result<Value, ErrorKind> { + pub async fn force(self, co: GenCo, span: LightSpan) -> Result<Value, ErrorKind> { // If the current thunk is already fully evaluated, return its evaluated // value. The VM will continue running the code that landed us here. if self.is_forced() { @@ -124,12 +124,14 @@ impl Thunk { // Begin evaluation of this thunk by marking it as a blackhole, meaning // that any other forcing frame encountering this thunk before its // evaluation is completed detected an evaluation cycle. - let inner = self.0.replace(ThunkRepr::Blackhole); + let inner = self.0.replace(ThunkRepr::Blackhole { forced_at: span }); match inner { // If there was already a blackhole in the thunk, this is an // evaluation cycle. - ThunkRepr::Blackhole => Err(ErrorKind::InfiniteRecursion), + ThunkRepr::Blackhole { forced_at } => Err(ErrorKind::InfiniteRecursion { + first_force: forced_at.span(), + }), // If there is a native function stored in the thunk, evaluate it // and replace this thunk's representation with the result. @@ -206,7 +208,7 @@ impl Thunk { pub fn value(&self) -> Ref<Value> { Ref::map(self.0.borrow(), |thunk| match thunk { ThunkRepr::Evaluated(value) => value, - ThunkRepr::Blackhole => panic!("Thunk::value called on a black-holed thunk"), + ThunkRepr::Blackhole { .. } => panic!("Thunk::value called on a black-holed thunk"), ThunkRepr::Suspended { .. } | ThunkRepr::Native(_) => { panic!("Thunk::value called on a suspended thunk") } diff --git a/tvix/eval/src/vm/generators.rs b/tvix/eval/src/vm/generators.rs index 853ab063465f..b7d8f7aeb5c5 100644 --- a/tvix/eval/src/vm/generators.rs +++ b/tvix/eval/src/vm/generators.rs @@ -293,7 +293,9 @@ impl<'o> VM<'o> { // back to the outer VM loop. VMRequest::ForceValue(value) => { self.reenqueue_generator(name, span.clone(), generator); - self.enqueue_generator("force", span, |co| value.force(co)); + self.enqueue_generator("force", span.clone(), |co| { + value.force(co, span) + }); return Ok(false); } @@ -313,7 +315,9 @@ impl<'o> VM<'o> { self.reenqueue_generator(name, span.clone(), generator); let value = self.stack[self.with_stack[idx]].clone(); - self.enqueue_generator("force", span, |co| value.force(co)); + self.enqueue_generator("force", span.clone(), |co| { + value.force(co, span) + }); return Ok(false); } @@ -328,7 +332,9 @@ impl<'o> VM<'o> { .expect("Tvix bug: generator requested captured with-value, but there is no call frame"); let value = call_frame.upvalues.with_stack().unwrap()[idx].clone(); - self.enqueue_generator("force", span, |co| value.force(co)); + self.enqueue_generator("force", span.clone(), |co| { + value.force(co, span) + }); return Ok(false); } @@ -441,7 +447,9 @@ impl<'o> VM<'o> { "generator should be reenqueued with the same frame ID" ); - self.enqueue_generator("force", span, |co| value.force(co)); + self.enqueue_generator("force", span.clone(), |co| { + value.force(co, span) + }); return Ok(false); } diff --git a/tvix/eval/src/vm/mod.rs b/tvix/eval/src/vm/mod.rs index 450d950b34a6..0fb1f9cd8cc9 100644 --- a/tvix/eval/src/vm/mod.rs +++ b/tvix/eval/src/vm/mod.rs @@ -483,7 +483,10 @@ impl<'o> VM<'o> { let gen_span = frame.current_light_span(); self.push_call_frame(span, frame); - self.enqueue_generator("force", gen_span, |co| thunk.force(co)); + self.enqueue_generator("force", gen_span.clone(), |co| { + thunk.force(co, gen_span) + }); + return Ok(false); } } |