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//! # Note
//!
//! This API is completely unstable and subject to change.
#![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
#![feature(never_type)]
#![feature(nll)]
#![feature(in_band_lifetimes)]
#![recursion_limit = "256"]
#[macro_use]
extern crate rustc;
use rustc::ty::query::Providers;
use rustc::ty::TyCtxt;
use rustc_hir::def_id::{DefId, LOCAL_CRATE};
use rustc_span::symbol::sym;
pub mod codegen_backend;
pub mod link;
pub mod symbol_names;
pub mod symbol_names_test;
pub fn trigger_delay_span_bug(tcx: TyCtxt<'_>, key: DefId) {
tcx.sess.delay_span_bug(
tcx.def_span(key),
"delayed span bug triggered by #[rustc_error(delay_span_bug_from_inside_query)]",
);
}
/// check for the #[rustc_error] annotation, which forces an
/// error in codegen. This is used to write compile-fail tests
/// that actually test that compilation succeeds without
/// reporting an error.
pub fn check_for_rustc_errors_attr(tcx: TyCtxt<'_>) {
if let Some((def_id, _)) = tcx.entry_fn(LOCAL_CRATE) {
let attrs = &*tcx.get_attrs(def_id);
for attr in attrs {
if attr.check_name(sym::rustc_error) {
match attr.meta_item_list() {
// check if there is a #[rustc_error(delayed)]
Some(list) => {
if list.iter().any(|list_item| {
list_item.ident().map(|i| i.name)
== Some(sym::delay_span_bug_from_inside_query)
}) {
tcx.ensure().trigger_delay_span_bug(def_id);
}
}
// bare #[rustc_error]
None => {
tcx.sess.span_fatal(
tcx.def_span(def_id),
"fatal error triggered by #[rustc_error]",
);
}
}
}
}
}
}
pub fn provide(providers: &mut Providers<'_>) {
crate::symbol_names::provide(providers);
*providers = Providers { trigger_delay_span_bug, ..*providers };
}
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