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/// This module provides macros which are used in the implementation
/// of the VM for the implementation of repetitive operations.
/// This macro simplifies the implementation of arithmetic operations,
/// correctly handling the behaviour on different pairings of number
/// types.
#[macro_export]
macro_rules! arithmetic_op {
( $self:ident, $op:tt ) => {{ // TODO: remove
let b = $self.pop();
let a = $self.pop();
let result = fallible!($self, arithmetic_op!(&a, &b, $op));
$self.push(result);
}};
( $a:expr, $b:expr, $op:tt ) => {{
match ($a, $b) {
(Value::Integer(i1), Value::Integer(i2)) => Ok(Value::Integer(i1 $op i2)),
(Value::Float(f1), Value::Float(f2)) => Ok(Value::Float(f1 $op f2)),
(Value::Integer(i1), Value::Float(f2)) => Ok(Value::Float(*i1 as f64 $op f2)),
(Value::Float(f1), Value::Integer(i2)) => Ok(Value::Float(f1 $op *i2 as f64)),
(v1, v2) => Err(ErrorKind::TypeError {
expected: "number (either int or float)",
actual: if v1.is_number() {
v2.type_of()
} else {
v1.type_of()
},
}),
}
}};
}
/// This macro simplifies the implementation of comparison operations.
#[macro_export]
macro_rules! cmp_op {
( $vm:ident, $frame:ident, $span:ident, $op:tt ) => {{
lifted_pop! {
$vm(b, a) => {
async fn compare(a: Value, b: Value, co: GenCo) -> Result<Value, ErrorKind> {
let a = generators::request_force(&co, a).await;
let b = generators::request_force(&co, b).await;
let span = generators::request_span(&co).await;
let ordering = a.nix_cmp_ordering(b, co, span).await?;
match ordering {
Err(cek) => Ok(Value::Catchable(cek)),
Ok(ordering) => Ok(Value::Bool(cmp_op!(@order $op ordering))),
}
}
let gen_span = $frame.current_light_span();
$vm.push_call_frame($span, $frame);
$vm.enqueue_generator("compare", gen_span, |co| compare(a, b, co));
return Ok(false);
}
}
}};
(@order < $ordering:expr) => {
$ordering == Ordering::Less
};
(@order > $ordering:expr) => {
$ordering == Ordering::Greater
};
(@order <= $ordering:expr) => {
matches!($ordering, Ordering::Equal | Ordering::Less)
};
(@order >= $ordering:expr) => {
matches!($ordering, Ordering::Equal | Ordering::Greater)
};
}
#[macro_export]
macro_rules! lifted_pop {
($vm:ident ($($bind:ident),+) => $body:expr) => {
{
$(
let $bind = $vm.stack_pop();
)+
$(
if $bind.is_catchable() {
$vm.stack.push($bind);
continue;
}
)+
$body
}
}
}
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