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