src/librustc_codegen_utils/lib.rs

   1 //! # Note
   2 //!
   3 //! This API is completely unstable and subject to change.
   4
   5 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
   6
   7 #![feature(arbitrary_self_types)]
   8 #![feature(box_patterns)]
   9 #![feature(box_syntax)]
  10 #![feature(core_intrinsics)]
  11 #![feature(never_type)]
  12 #![feature(nll)]
  13 #![feature(in_band_lifetimes)]
  14
  15 #![recursion_limit="256"]
  16
  17 #[macro_use]
  18 extern crate rustc;
  19
  20 use rustc::ty::TyCtxt;
  21 use rustc::ty::query::Providers;
  22 use rustc::hir::def_id::{LOCAL_CRATE, DefId};
  23 use syntax::symbol::sym;
  24
  25 pub mod link;
  26 pub mod codegen_backend;
  27 pub mod symbol_names;
  28 pub mod symbol_names_test;
  29
  30
  31 pub fn trigger_delay_span_bug(tcx: TyCtxt<'_>, key: DefId) {
  32     tcx.sess.delay_span_bug(
  33         tcx.def_span(key),
  34         "delayed span bug triggered by #[rustc_error(delay_span_bug_from_inside_query)]"
  35     );
  36 }
  37
  38 /// check for the #[rustc_error] annotation, which forces an
  39 /// error in codegen. This is used to write compile-fail tests
  40 /// that actually test that compilation succeeds without
  41 /// reporting an error.
  42 pub fn check_for_rustc_errors_attr(tcx: TyCtxt<'_>) {
  43     if let Some((def_id, _)) = tcx.entry_fn(LOCAL_CRATE) {
  44         let attrs = &*tcx.get_attrs(def_id);
  45         for attr in attrs {
  46             if attr.check_name(sym::rustc_error) {
  47                 match attr.meta_item_list() {
  48                     // check if there is a #[rustc_error(delayed)]
  49                     Some(list) => {
  50                         if list.iter().any(|list_item| {
  51                             list_item.ident().map(|i| i.name) ==
  52                                 Some(sym::delay_span_bug_from_inside_query)
  53                         }) {
  54                             tcx.ensure().trigger_delay_span_bug(def_id);
  55                         }
  56                     }
  57                     // bare #[rustc_error]
  58                     None => {
  59                         tcx.sess.span_fatal(
  60                             tcx.def_span(def_id),
  61                             "fatal error triggered by #[rustc_error]"
  62                         );
  63                     }
  64                 }
  65             }
  66         }
  67     }
  68 }
  69
  70 pub fn provide(providers: &mut Providers<'_>) {
  71     crate::symbol_names::provide(providers);
  72     *providers = Providers {
  73         trigger_delay_span_bug,
  74         ..*providers
  75     };
  76 }