| macro_rules! enum_from_u32 { |
| ($(#[$attr:meta])* pub enum $name:ident { |
| $($variant:ident = $e:expr,)* |
| }) => { |
| $(#[$attr])* |
| pub enum $name { |
| $($variant = $e),* |
| } |
| |
| impl $name { |
| pub fn from_u32(u: u32) -> Option<$name> { |
| $(if u == $name::$variant as u32 { |
| return Some($name::$variant) |
| })* |
| None |
| } |
| } |
| }; |
| ($(#[$attr:meta])* pub enum $name:ident { |
| $($variant:ident,)* |
| }) => { |
| $(#[$attr])* |
| pub enum $name { |
| $($variant,)* |
| } |
| |
| impl $name { |
| pub fn from_u32(u: u32) -> Option<$name> { |
| $(if u == $name::$variant as u32 { |
| return Some($name::$variant) |
| })* |
| None |
| } |
| } |
| } |
| } |
| |
| #[macro_export] |
| macro_rules! bug { |
| () => ( bug!("impossible case reached") ); |
| ($($message:tt)*) => ({ |
| $crate::util::bug::bug_fmt(file!(), line!(), format_args!($($message)*)) |
| }) |
| } |
| |
| #[macro_export] |
| macro_rules! span_bug { |
| ($span:expr, $($message:tt)*) => ({ |
| $crate::util::bug::span_bug_fmt(file!(), line!(), $span, format_args!($($message)*)) |
| }) |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Lift and TypeFoldable macros |
| // |
| // When possible, use one of these (relatively) convenient macros to write |
| // the impls for you. |
| |
| #[macro_export] |
| macro_rules! CloneLiftImpls { |
| (for <$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(Clone::clone(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! CloneTypeFoldableImpls { |
| (for <$tcx:lifetime> { $($ty:ty,)+ }) => { |
| $( |
| impl<$tcx> $crate::ty::fold::TypeFoldable<$tcx> for $ty { |
| fn super_fold_with<F: $crate::ty::fold::TypeFolder<$tcx>>( |
| &self, |
| _: &mut F |
| ) -> $ty { |
| Clone::clone(self) |
| } |
| |
| fn super_visit_with<F: $crate::ty::fold::TypeVisitor<$tcx>>( |
| &self, |
| _: &mut F) |
| -> bool |
| { |
| false |
| } |
| } |
| )+ |
| }; |
| |
| ($($ty:ty,)+) => { |
| CloneTypeFoldableImpls! { |
| for <'tcx> { |
| $($ty,)+ |
| } |
| } |
| }; |
| } |
| |
| #[macro_export] |
| macro_rules! CloneTypeFoldableAndLiftImpls { |
| ($($t:tt)*) => { |
| CloneTypeFoldableImpls! { $($t)* } |
| CloneLiftImpls! { $($t)* } |
| } |
| } |
| |
| #[macro_export] |
| macro_rules! EnumTypeFoldableImpl { |
| (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 super_fold_with<V: $crate::ty::fold::TypeFolder<$tcx>>( |
| &self, |
| folder: &mut V, |
| ) -> Self { |
| EnumTypeFoldableImpl!(@FoldVariants(self, folder) input($($variants)*) output()) |
| } |
| |
| fn super_visit_with<V: $crate::ty::fold::TypeVisitor<$tcx>>( |
| &self, |
| visitor: &mut V, |
| ) -> bool { |
| EnumTypeFoldableImpl!(@VisitVariants(self, visitor) input($($variants)*) output()) |
| } |
| } |
| }; |
| |
| (@FoldVariants($this:expr, $folder:expr) input() output($($output:tt)*)) => { |
| match $this { |
| $($output)* |
| } |
| }; |
| |
| (@FoldVariants($this:expr, $folder:expr) |
| input( ($variant:path) ( $($variant_arg:ident),* ) , $($input:tt)*) |
| output( $($output:tt)*) ) => { |
| EnumTypeFoldableImpl!( |
| @FoldVariants($this, $folder) |
| input($($input)*) |
| output( |
| $variant ( $($variant_arg),* ) => { |
| $variant ( |
| $($crate::ty::fold::TypeFoldable::fold_with($variant_arg, $folder)),* |
| ) |
| } |
| $($output)* |
| ) |
| ) |
| }; |
| |
| (@FoldVariants($this:expr, $folder:expr) |
| input( ($variant:path) { $($variant_arg:ident),* $(,)? } , $($input:tt)*) |
| output( $($output:tt)*) ) => { |
| EnumTypeFoldableImpl!( |
| @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)*) ) => { |
| EnumTypeFoldableImpl!( |
| @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)*) ) => { |
| EnumTypeFoldableImpl!( |
| @VisitVariants($this, $visitor) |
| input($($input)*) |
| output( |
| $variant ( $($variant_arg),* ) => { |
| false $(|| $crate::ty::fold::TypeFoldable::visit_with( |
| $variant_arg, $visitor |
| ))* |
| } |
| $($output)* |
| ) |
| ) |
| }; |
| |
| (@VisitVariants($this:expr, $visitor:expr) |
| input( ($variant:path) { $($variant_arg:ident),* $(,)? } , $($input:tt)*) |
| output( $($output:tt)*) ) => { |
| EnumTypeFoldableImpl!( |
| @VisitVariants($this, $visitor) |
| input($($input)*) |
| output( |
| $variant { $($variant_arg),* } => { |
| false $(|| $crate::ty::fold::TypeFoldable::visit_with( |
| $variant_arg, $visitor |
| ))* |
| } |
| $($output)* |
| ) |
| ) |
| }; |
| |
| (@VisitVariants($this:expr, $visitor:expr) |
| input( ($variant:path), $($input:tt)*) |
| output( $($output:tt)*) ) => { |
| EnumTypeFoldableImpl!( |
| @VisitVariants($this, $visitor) |
| input($($input)*) |
| output( |
| $variant => { false } |
| $($output)* |
| ) |
| ) |
| }; |
| } |