compiler/rustc_macros/src/lib.rs

   1 #![feature(proc_macro_diagnostic)]
   2 #![feature(allow_internal_unstable)]
   3 #![allow(rustc::default_hash_types)]
   4 #![recursion_limit = "128"]
   5
   6 use synstructure::decl_derive;
   7
   8 use proc_macro::TokenStream;
   9
  10 mod hash_stable;
  11 mod lift;
  12 mod newtype;
  13 mod query;
  14 mod serialize;
  15 mod session_diagnostic;
  16 mod symbols;
  17 mod type_foldable;
  18
  19 #[proc_macro]
  20 pub fn rustc_queries(input: TokenStream) -> TokenStream {
  21     query::rustc_queries(input)
  22 }
  23
  24 #[proc_macro]
  25 pub fn symbols(input: TokenStream) -> TokenStream {
  26     symbols::symbols(input.into()).into()
  27 }
  28
  29 /// Creates a struct type `S` that can be used as an index with
  30 /// `IndexVec` and so on.
  31 ///
  32 /// There are two ways of interacting with these indices:
  33 ///
  34 /// - The `From` impls are the preferred way. So you can do
  35 ///   `S::from(v)` with a `usize` or `u32`. And you can convert back
  36 ///   to an integer with `u32::from(s)`.
  37 ///
  38 /// - Alternatively, you can use the methods `S::new(v)` and `s.index()`
  39 ///   to create/return a value.
  40 ///
  41 /// Internally, the index uses a u32, so the index must not exceed
  42 /// `u32::MAX`. You can also customize things like the `Debug` impl,
  43 /// what traits are derived, and so forth via the macro.
  44 #[proc_macro]
  45 #[allow_internal_unstable(step_trait, rustc_attrs, trusted_step)]
  46 pub fn newtype_index(input: TokenStream) -> TokenStream {
  47     newtype::newtype(input).into()
  48 }
  49
  50 decl_derive!([HashStable, attributes(stable_hasher)] => hash_stable::hash_stable_derive);
  51 decl_derive!(
  52     [HashStable_Generic, attributes(stable_hasher)] =>
  53     hash_stable::hash_stable_generic_derive
  54 );
  55
  56 decl_derive!([Decodable] => serialize::decodable_derive);
  57 decl_derive!([Encodable] => serialize::encodable_derive);
  58 decl_derive!([TyDecodable] => serialize::type_decodable_derive);
  59 decl_derive!([TyEncodable] => serialize::type_encodable_derive);
  60 decl_derive!([MetadataDecodable] => serialize::meta_decodable_derive);
  61 decl_derive!([MetadataEncodable] => serialize::meta_encodable_derive);
  62 decl_derive!([TypeFoldable, attributes(type_foldable)] => type_foldable::type_foldable_derive);
  63 decl_derive!([Lift, attributes(lift)] => lift::lift_derive);
  64 decl_derive!(
  65     [SessionDiagnostic, attributes(
  66         message,
  67         lint,
  68         error,
  69         label,
  70         suggestion,
  71         suggestion_short,
  72         suggestion_hidden,
  73         suggestion_verbose)] => session_diagnostic::session_diagnostic_derive
  74 );