diff options
Diffstat (limited to 'compiler/rustc_type_ir/src/macros.rs')
-rw-r--r-- | compiler/rustc_type_ir/src/macros.rs | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/compiler/rustc_type_ir/src/macros.rs b/compiler/rustc_type_ir/src/macros.rs new file mode 100644 index 000000000..6c1810397 --- /dev/null +++ b/compiler/rustc_type_ir/src/macros.rs @@ -0,0 +1,176 @@ +/// Used for types that are `Copy` and which **do not care arena +/// allocated data** (i.e., don't need to be folded). +macro_rules! TrivialTypeTraversalImpls { + ($($ty:ty,)+) => { + $( + impl<I: $crate::Interner> $crate::fold::TypeFoldable<I> for $ty { + fn try_fold_with<F: $crate::fold::FallibleTypeFolder<I>>( + self, + _: &mut F, + ) -> ::std::result::Result<Self, F::Error> { + Ok(self) + } + + #[inline] + fn fold_with<F: $crate::fold::TypeFolder<I>>( + self, + _: &mut F, + ) -> Self { + self + } + } + + impl<I: $crate::Interner> $crate::visit::TypeVisitable<I> for $ty { + #[inline] + fn visit_with<F: $crate::visit::TypeVisitor<I>>( + &self, + _: &mut F) + -> ::std::ops::ControlFlow<F::BreakTy> + { + ::std::ops::ControlFlow::Continue(()) + } + } + )+ + }; +} + +macro_rules! EnumTypeTraversalImpl { + (impl<$($p:tt),*> TypeFoldable<$tcx:tt> for $s:path { + $($variants:tt)* + } $(where $($wc:tt)*)*) => { + impl<$($p),*> $crate::fold::TypeFoldable<$tcx> for $s + $(where $($wc)*)* + { + fn try_fold_with<V: $crate::fold::FallibleTypeFolder<$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),*> $crate::visit::TypeVisitable<$tcx> for $s + $(where $($wc)*)* + { + fn visit_with<V: $crate::visit::TypeVisitor<$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::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::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::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::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)* + ) + ) + }; +} |