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 use rustc_errors as errors;
  20
  21 mod diagnostics;
  22
  23 mod asm;
  24 mod assert;
  25 mod cfg;
  26 mod compile_error;
  27 mod concat;
  28 mod concat_idents;
  29 mod env;
  30 mod format;
  31 mod format_foreign;
  32 mod global_asm;
  33 mod log_syntax;
  34 mod proc_macro_server;
  35 mod test;
  36 mod test_case;
  37 mod trace_macros;
  38
  39 pub mod deriving;
  40 pub mod proc_macro_decls;
  41 pub mod proc_macro_impl;
  42
  43 use rustc_data_structures::sync::Lrc;
  44 use syntax::ast;
  45 use syntax::ext::base::{MacroExpanderFn, NormalTT, NamedSyntaxExtension, MultiModifier};
  46 use syntax::ext::hygiene;
  47 use syntax::symbol::Symbol;
  48
  49 pub fn register_builtins(resolver: &mut dyn syntax::ext::base::Resolver,
  50                          user_exts: Vec<NamedSyntaxExtension>) {
  51     deriving::register_builtin_derives(resolver);
  52
  53     let mut register = |name, ext| {
  54         resolver.add_builtin(ast::Ident::with_empty_ctxt(name), Lrc::new(ext));
  55     };
  56
  57     macro_rules! register {
  58         ($( $name:ident: $f:expr, )*) => { $(
  59             register(Symbol::intern(stringify!($name)),
  60                      NormalTT {
  61                         expander: Box::new($f as MacroExpanderFn),
  62                         def_info: None,
  63                         allow_internal_unstable: None,
  64                         allow_internal_unsafe: false,
  65                         local_inner_macros: false,
  66                         unstable_feature: None,
  67                         edition: hygiene::default_edition(),
  68                     });
  69         )* }
  70     }
  71
  72     use syntax::ext::source_util::*;
  73     register! {
  74         line: expand_line,
  75         __rust_unstable_column: expand_column_gated,
  76         column: expand_column,
  77         file: expand_file,
  78         stringify: expand_stringify,
  79         include: expand_include,
  80         include_str: expand_include_str,
  81         include_bytes: expand_include_bytes,
  82         module_path: expand_mod,
  83
  84         asm: asm::expand_asm,
  85         global_asm: global_asm::expand_global_asm,
  86         cfg: cfg::expand_cfg,
  87         concat: concat::expand_syntax_ext,
  88         concat_idents: concat_idents::expand_syntax_ext,
  89         env: env::expand_env,
  90         option_env: env::expand_option_env,
  91         log_syntax: log_syntax::expand_syntax_ext,
  92         trace_macros: trace_macros::expand_trace_macros,
  93         compile_error: compile_error::expand_compile_error,
  94         assert: assert::expand_assert,
  95     }
  96
  97     register(Symbol::intern("test_case"), MultiModifier(Box::new(test_case::expand)));
  98     register(Symbol::intern("test"), MultiModifier(Box::new(test::expand_test)));
  99     register(Symbol::intern("bench"), MultiModifier(Box::new(test::expand_bench)));
 100
 101     // format_args uses `unstable` things internally.
 102     register(Symbol::intern("format_args"),
 103              NormalTT {
 104                 expander: Box::new(format::expand_format_args),
 105                 def_info: None,
 106                 allow_internal_unstable: Some(vec![
 107                     Symbol::intern("fmt_internals"),
 108                 ].into()),
 109                 allow_internal_unsafe: false,
 110                 local_inner_macros: false,
 111                 unstable_feature: None,
 112                 edition: hygiene::default_edition(),
 113             });
 114     register(Symbol::intern("format_args_nl"),
 115              NormalTT {
 116                  expander: Box::new(format::expand_format_args_nl),
 117                  def_info: None,
 118                  allow_internal_unstable: Some(vec![
 119                      Symbol::intern("fmt_internals"),
 120                  ].into()),
 121                  allow_internal_unsafe: false,
 122                  local_inner_macros: false,
 123                  unstable_feature: None,
 124                  edition: hygiene::default_edition(),
 125              });
 126
 127     for (name, ext) in user_exts {
 128         register(name, ext);
 129     }
 130 }