Struct tvix_eval::value::function::Lambda

pub struct Lambda {
    pub(crate) chunk: Chunk,
    pub(crate) name: Option<SmolStr>,
    pub(crate) upvalue_count: usize,
    pub(crate) formals: Option<Formals>,
}

The opcodes for a thunk or closure, plus the number of non-executable opcodes which are allowed after an OpThunkClosure or OpThunkSuspended referencing it. At runtime Lambda is usually wrapped in Rc to avoid copying the Chunk it holds (which can be quite large).

In order to correctly reproduce cppnix’s “pointer equality” semantics it is important that we never clone a Lambda – use Rc<Lambda>::clone() instead. This struct deliberately does not derive(Clone) in order to prevent this from being done accidentally.

Fields

chunk: Chunk

name: Option<SmolStr>

Name of the function (equivalent to the name of the identifier (e.g. a value in a let-expression or an attribute set entry) it is located in).

upvalue_count: usize

Number of upvalues which the code in this Lambda closes over, and which need to be initialised at runtime. Information about the variables is emitted using data-carrying opcodes (see crate::opcode::OpCode::DataStackIdx).

formals: Option<Formals>

Implementations

impl Lambda

pub fn chunk(&mut self) -> &mut Chunk

Trait Implementations

impl Debug for Lambda

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Lambda

fn default() -> Lambda

Returns the “default value” for a type.