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|
#[macro_export]
macro_rules! bug {
() => ( $crate::bug!("impossible case reached") );
($msg:expr) => ({ $crate::util::bug::bug_fmt(::std::format_args!($msg)) });
($msg:expr,) => ({ $crate::bug!($msg) });
($fmt:expr, $($arg:tt)+) => ({
$crate::util::bug::bug_fmt(::std::format_args!($fmt, $($arg)+))
});
}
#[macro_export]
macro_rules! span_bug {
($span:expr, $msg:expr) => ({ $crate::util::bug::span_bug_fmt($span, ::std::format_args!($msg)) });
($span:expr, $msg:expr,) => ({ $crate::span_bug!($span, $msg) });
($span:expr, $fmt:expr, $($arg:tt)+) => ({
$crate::util::bug::span_bug_fmt($span, ::std::format_args!($fmt, $($arg)+))
});
}
///////////////////////////////////////////////////////////////////////////
// Lift and TypeFoldable/TypeVisitable macros
//
// When possible, use one of these (relatively) convenient macros to write
// the impls for you.
#[macro_export]
macro_rules! CloneLiftImpls {
(for <$tcx:lifetime> { $($ty:ty,)+ }) => {
$(
impl<$tcx> $crate::ty::Lift<$tcx> for $ty {
type Lifted = Self;
fn lift_to_tcx(self, _: $crate::ty::TyCtxt<$tcx>) -> Option<Self> {
Some(self)
}
}
)+
};
($($ty:ty,)+) => {
CloneLiftImpls! {
for <'tcx> {
$($ty,)+
}
}
};
}
/// Used for types that are `Copy` and which **do not care arena
/// allocated data** (i.e., don't need to be folded).
#[macro_export]
macro_rules! TrivialTypeTraversalImpls {
(for <$tcx:lifetime> { $($ty:ty,)+ }) => {
$(
impl<$tcx> $crate::ty::fold::TypeFoldable<$tcx> for $ty {
fn try_fold_with<F: $crate::ty::fold::FallibleTypeFolder<$tcx>>(
self,
_: &mut F
) -> ::std::result::Result<$ty, F::Error> {
Ok(self)
}
}
impl<$tcx> $crate::ty::visit::TypeVisitable<$tcx> for $ty {
fn visit_with<F: $crate::ty::visit::TypeVisitor<$tcx>>(
&self,
_: &mut F)
-> ::std::ops::ControlFlow<F::BreakTy>
{
::std::ops::ControlFlow::CONTINUE
}
}
)+
};
($($ty:ty,)+) => {
TrivialTypeTraversalImpls! {
for <'tcx> {
$($ty,)+
}
}
};
}
#[macro_export]
macro_rules! TrivialTypeTraversalAndLiftImpls {
($($t:tt)*) => {
TrivialTypeTraversalImpls! { $($t)* }
CloneLiftImpls! { $($t)* }
}
}
#[macro_export]
macro_rules! EnumTypeTraversalImpl {
(impl<$($p:tt),*> TypeFoldable<$tcx:tt> for $s:path {
$($variants:tt)*
} $(where $($wc:tt)*)*) => {
impl<$($p),*> $crate::ty::fold::TypeFoldable<$tcx> for $s
$(where $($wc)*)*
{
fn try_fold_with<V: $crate::ty::fold::FallibleTypeFolder<$tcx>>(
self,
folder: &mut V,
) -> ::std::result::Result<Self, V::Error> {
EnumTypeTraversalImpl!(@FoldVariants(self, folder) input($($variants)*) output())
}
}
};
(impl<$($p:tt),*> TypeVisitable<$tcx:tt> for $s:path {
$($variants:tt)*
} $(where $($wc:tt)*)*) => {
impl<$($p),*> $crate::ty::visit::TypeVisitable<$tcx> for $s
$(where $($wc)*)*
{
fn visit_with<V: $crate::ty::visit::TypeVisitor<$tcx>>(
&self,
visitor: &mut V,
) -> ::std::ops::ControlFlow<V::BreakTy> {
EnumTypeTraversalImpl!(@VisitVariants(self, visitor) input($($variants)*) output())
}
}
};
(@FoldVariants($this:expr, $folder:expr) input() output($($output:tt)*)) => {
Ok(match $this {
$($output)*
})
};
(@FoldVariants($this:expr, $folder:expr)
input( ($variant:path) ( $($variant_arg:ident),* ) , $($input:tt)*)
output( $($output:tt)*) ) => {
EnumTypeTraversalImpl!(
@FoldVariants($this, $folder)
input($($input)*)
output(
$variant ( $($variant_arg),* ) => {
$variant (
$($crate::ty::fold::TypeFoldable::try_fold_with($variant_arg, $folder)?),*
)
}
$($output)*
)
)
};
(@FoldVariants($this:expr, $folder:expr)
input( ($variant:path) { $($variant_arg:ident),* $(,)? } , $($input:tt)*)
output( $($output:tt)*) ) => {
EnumTypeTraversalImpl!(
@FoldVariants($this, $folder)
input($($input)*)
output(
$variant { $($variant_arg),* } => {
$variant {
$($variant_arg: $crate::ty::fold::TypeFoldable::fold_with(
$variant_arg, $folder
)?),* }
}
$($output)*
)
)
};
(@FoldVariants($this:expr, $folder:expr)
input( ($variant:path), $($input:tt)*)
output( $($output:tt)*) ) => {
EnumTypeTraversalImpl!(
@FoldVariants($this, $folder)
input($($input)*)
output(
$variant => { $variant }
$($output)*
)
)
};
(@VisitVariants($this:expr, $visitor:expr) input() output($($output:tt)*)) => {
match $this {
$($output)*
}
};
(@VisitVariants($this:expr, $visitor:expr)
input( ($variant:path) ( $($variant_arg:ident),* ) , $($input:tt)*)
output( $($output:tt)*) ) => {
EnumTypeTraversalImpl!(
@VisitVariants($this, $visitor)
input($($input)*)
output(
$variant ( $($variant_arg),* ) => {
$($crate::ty::visit::TypeVisitable::visit_with(
$variant_arg, $visitor
)?;)*
::std::ops::ControlFlow::CONTINUE
}
$($output)*
)
)
};
(@VisitVariants($this:expr, $visitor:expr)
input( ($variant:path) { $($variant_arg:ident),* $(,)? } , $($input:tt)*)
output( $($output:tt)*) ) => {
EnumTypeTraversalImpl!(
@VisitVariants($this, $visitor)
input($($input)*)
output(
$variant { $($variant_arg),* } => {
$($crate::ty::visit::TypeVisitable::visit_with(
$variant_arg, $visitor
)?;)*
::std::ops::ControlFlow::CONTINUE
}
$($output)*
)
)
};
(@VisitVariants($this:expr, $visitor:expr)
input( ($variant:path), $($input:tt)*)
output( $($output:tt)*) ) => {
EnumTypeTraversalImpl!(
@VisitVariants($this, $visitor)
input($($input)*)
output(
$variant => { ::std::ops::ControlFlow::CONTINUE }
$($output)*
)
)
};
}
|
