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|
//! Validity checking for weak lang items
use rustc_data_structures::fx::FxHashSet;
use rustc_errors::struct_span_err;
use rustc_hir::lang_items::{self, LangItem};
use rustc_hir::weak_lang_items::WEAK_ITEMS_REFS;
use rustc_middle::middle::lang_items::required;
use rustc_middle::ty::TyCtxt;
use rustc_session::config::CrateType;
/// 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>(tcx: TyCtxt<'tcx>, 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) = WEAK_ITEMS_REFS.get(&lang_item) {
if items.require(item).is_err() {
items.missing.push(item);
}
} else {
let span = tcx.def_span(id.def_id);
struct_span_err!(
tcx.sess,
span,
E0264,
"unknown external lang item: `{}`",
lang_item
)
.emit();
}
}
}
verify(tcx, items);
}
fn verify<'tcx>(tcx: TyCtxt<'tcx>, 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.sess.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 (name, &item) in WEAK_ITEMS_REFS.iter() {
if missing.contains(&item) && required(tcx, item) && items.require(item).is_err() {
if item == LangItem::PanicImpl {
tcx.sess.err("`#[panic_handler]` function required, but not found");
} else if item == LangItem::Oom {
if !tcx.features().default_alloc_error_handler {
tcx.sess.err("`#[alloc_error_handler]` function required, but not found");
tcx.sess.note_without_error("use `#![feature(default_alloc_error_handler)]` for a default error handler");
}
} else {
tcx
.sess
.diagnostic()
.struct_err(&format!("language item required, but not found: `{}`", name))
.note(&format!("this can occur when a binary crate with `#![no_std]` is compiled for a target where `{}` is defined in the standard library", name))
.help(&format!("you may be able to compile for a target that doesn't need `{}`, specify a target with `--target` or in `.cargo/config`", name))
.emit();
}
}
}
}
|
