77 lines
2.7 KiB
Rust
77 lines
2.7 KiB
Rust
//! Validity checking for weak lang items
|
|
|
|
use rustc_data_structures::fx::FxHashSet;
|
|
use rustc_hir::lang_items::{self, LangItem};
|
|
use rustc_hir::weak_lang_items::WEAK_LANG_ITEMS;
|
|
use rustc_middle::middle::lang_items::required;
|
|
use rustc_middle::ty::TyCtxt;
|
|
use rustc_session::config::CrateType;
|
|
|
|
use crate::errors::{MissingLangItem, MissingPanicHandler, UnknownExternLangItem};
|
|
|
|
/// Checks the crate for usage of weak lang items, returning a vector of all the
|
|
/// language items required by this crate, but not defined yet.
|
|
pub fn check_crate(tcx: TyCtxt<'_>, items: &mut lang_items::LanguageItems) {
|
|
// These are never called by user code, they're generated by the compiler.
|
|
// They will never implicitly be added to the `missing` array unless we do
|
|
// so here.
|
|
if items.eh_personality().is_none() {
|
|
items.missing.push(LangItem::EhPersonality);
|
|
}
|
|
if tcx.sess.target.os == "emscripten" && items.eh_catch_typeinfo().is_none() {
|
|
items.missing.push(LangItem::EhCatchTypeinfo);
|
|
}
|
|
|
|
let crate_items = tcx.hir_crate_items(());
|
|
for id in crate_items.foreign_items() {
|
|
let attrs = tcx.hir().attrs(id.hir_id());
|
|
if let Some((lang_item, _)) = lang_items::extract(attrs) {
|
|
if let Some(item) = LangItem::from_name(lang_item)
|
|
&& item.is_weak()
|
|
{
|
|
if items.get(item).is_none() {
|
|
items.missing.push(item);
|
|
}
|
|
} else {
|
|
let span = tcx.def_span(id.owner_id);
|
|
tcx.sess.emit_err(UnknownExternLangItem { span, lang_item });
|
|
}
|
|
}
|
|
}
|
|
|
|
verify(tcx, items);
|
|
}
|
|
|
|
fn verify(tcx: TyCtxt<'_>, items: &lang_items::LanguageItems) {
|
|
// We only need to check for the presence of weak lang items if we're
|
|
// emitting something that's not an rlib.
|
|
let needs_check = tcx.crate_types().iter().any(|kind| match *kind {
|
|
CrateType::Dylib
|
|
| CrateType::ProcMacro
|
|
| CrateType::Cdylib
|
|
| CrateType::Executable
|
|
| CrateType::Staticlib => true,
|
|
CrateType::Rlib => false,
|
|
});
|
|
if !needs_check {
|
|
return;
|
|
}
|
|
|
|
let mut missing = FxHashSet::default();
|
|
for &cnum in tcx.crates(()).iter() {
|
|
for &item in tcx.missing_lang_items(cnum).iter() {
|
|
missing.insert(item);
|
|
}
|
|
}
|
|
|
|
for &item in WEAK_LANG_ITEMS.iter() {
|
|
if missing.contains(&item) && required(tcx, item) && items.get(item).is_none() {
|
|
if item == LangItem::PanicImpl {
|
|
tcx.sess.emit_err(MissingPanicHandler);
|
|
} else {
|
|
tcx.sess.emit_err(MissingLangItem { name: item.name() });
|
|
}
|
|
}
|
|
}
|
|
}
|