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Diffstat (limited to '')
-rw-r--r-- | tvix/eval/src/value/builtin.rs | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/tvix/eval/src/value/builtin.rs b/tvix/eval/src/value/builtin.rs index d1248b1ec219..7572103ec96e 100644 --- a/tvix/eval/src/value/builtin.rs +++ b/tvix/eval/src/value/builtin.rs @@ -3,13 +3,23 @@ //! //! Builtins are directly backed by Rust code operating on Nix values. -use crate::errors::ErrorKind; +use crate::{errors::ErrorKind, vm::VM}; use super::Value; use std::fmt::{Debug, Display}; -pub type BuiltinFn = fn(arg: Vec<Value>) -> Result<Value, ErrorKind>; +/// Function pointer type for builtins implemented directly by backing +/// Rust code. +/// +/// Builtins declare their arity and are passed a vector with the +/// right number of arguments. Additionally, as they might have to +/// force the evaluation of thunks, they are passed a reference to the +/// current VM which they can use for forcing a value. +/// +/// Errors returned from a builtin will be annotated with the location +/// of the call to the builtin. +pub type BuiltinFn = fn(arg: Vec<Value>, vm: &mut VM) -> Result<Value, ErrorKind>; /// Represents a single built-in function which directly executes Rust /// code that operates on a Nix value. @@ -50,11 +60,11 @@ impl Builtin { /// Apply an additional argument to the builtin, which will either /// lead to execution of the function or to returning a partial /// builtin. - pub fn apply(mut self, arg: Value) -> Result<Value, ErrorKind> { + pub fn apply(mut self, vm: &mut VM, arg: Value) -> Result<Value, ErrorKind> { self.partials.push(arg); if self.partials.len() == self.arity { - return (self.func)(self.partials); + return (self.func)(self.partials, vm); } // Function is not yet ready to be called. |