src/libsyntax_ext/lib.rs

   1 //! Syntax extensions in the Rust compiler.
   2
   3 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
   4
   5 #![deny(rust_2018_idioms)]
   6
   7 #![feature(in_band_lifetimes)]
   8 #![feature(proc_macro_diagnostic)]
   9 #![feature(proc_macro_internals)]
  10 #![feature(proc_macro_span)]
  11 #![feature(decl_macro)]
  12 #![feature(nll)]
  13 #![feature(rustc_diagnostic_macros)]
  14
  15 #![recursion_limit="256"]
  16
  17 extern crate proc_macro;
  18
  19 mod diagnostics;
  20
  21 mod asm;
  22 mod assert;
  23 mod cfg;
  24 mod compile_error;
  25 mod concat;
  26 mod concat_idents;
  27 mod env;
  28 mod format;
  29 mod format_foreign;
  30 mod global_asm;
  31 mod log_syntax;
  32 mod proc_macro_server;
  33 mod test;
  34 mod test_case;
  35 mod trace_macros;
  36
  37 pub mod deriving;
  38 pub mod proc_macro_decls;
  39 pub mod proc_macro_impl;
  40
  41 use rustc_data_structures::sync::Lrc;
  42 use syntax::ast;
  43 use syntax::ext::base::{MacroExpanderFn, NormalTT, NamedSyntaxExtension, MultiModifier};
  44 use syntax::ext::hygiene;
  45 use syntax::symbol::Symbol;
  46
  47 pub fn register_builtins(resolver: &mut dyn syntax::ext::base::Resolver,
  48                          user_exts: Vec<NamedSyntaxExtension>) {
  49     deriving::register_builtin_derives(resolver);
  50
  51     let mut register = |name, ext| {
  52         resolver.add_builtin(ast::Ident::with_empty_ctxt(name), Lrc::new(ext));
  53     };
  54
  55     macro_rules! register {
  56         ($( $name:ident: $f:expr, )*) => { $(
  57             register(Symbol::intern(stringify!($name)),
  58                      NormalTT {
  59                         expander: Box::new($f as MacroExpanderFn),
  60                         def_info: None,
  61                         allow_internal_unstable: None,
  62                         allow_internal_unsafe: false,
  63                         local_inner_macros: false,
  64                         unstable_feature: None,
  65                         edition: hygiene::default_edition(),
  66                     });
  67         )* }
  68     }
  69
  70     use syntax::ext::source_util::*;
  71     register! {
  72         line: expand_line,
  73         __rust_unstable_column: expand_column_gated,
  74         column: expand_column,
  75         file: expand_file,
  76         stringify: expand_stringify,
  77         include: expand_include,
  78         include_str: expand_include_str,
  79         include_bytes: expand_include_bytes,
  80         module_path: expand_mod,
  81
  82         asm: asm::expand_asm,
  83         global_asm: global_asm::expand_global_asm,
  84         cfg: cfg::expand_cfg,
  85         concat: concat::expand_syntax_ext,
  86         concat_idents: concat_idents::expand_syntax_ext,
  87         env: env::expand_env,
  88         option_env: env::expand_option_env,
  89         log_syntax: log_syntax::expand_syntax_ext,
  90         trace_macros: trace_macros::expand_trace_macros,
  91         compile_error: compile_error::expand_compile_error,
  92         assert: assert::expand_assert,
  93     }
  94
  95     register(Symbol::intern("test_case"), MultiModifier(Box::new(test_case::expand)));
  96     register(Symbol::intern("test"), MultiModifier(Box::new(test::expand_test)));
  97     register(Symbol::intern("bench"), MultiModifier(Box::new(test::expand_bench)));
  98
  99     // format_args uses `unstable` things internally.
 100     register(Symbol::intern("format_args"),
 101              NormalTT {
 102                 expander: Box::new(format::expand_format_args),
 103                 def_info: None,
 104                 allow_internal_unstable: Some(vec![
 105                     Symbol::intern("fmt_internals"),
 106                 ].into()),
 107                 allow_internal_unsafe: false,
 108                 local_inner_macros: false,
 109                 unstable_feature: None,
 110                 edition: hygiene::default_edition(),
 111             });
 112     register(Symbol::intern("format_args_nl"),
 113              NormalTT {
 114                  expander: Box::new(format::expand_format_args_nl),
 115                  def_info: None,
 116                  allow_internal_unstable: Some(vec![
 117                      Symbol::intern("fmt_internals"),
 118                  ].into()),
 119                  allow_internal_unsafe: false,
 120                  local_inner_macros: false,
 121                  unstable_feature: None,
 122                  edition: hygiene::default_edition(),
 123              });
 124
 125     for (name, ext) in user_exts {
 126         register(name, ext);
 127     }
 128 }