125 lines
3.9 KiB
Rust
125 lines
3.9 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Validity checking for weak lang items
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use driver::config;
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use driver::session::Session;
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use metadata::csearch;
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use middle::lang_items;
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use syntax::ast;
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use syntax::codemap::Span;
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use syntax::parse::token::InternedString;
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use syntax::visit::Visitor;
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use syntax::visit;
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use std::collections::HashSet;
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macro_rules! weak_lang_items( ($($name:ident, $item:ident, $sym:ident;)*) => (
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struct Context<'a> {
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sess: &'a Session,
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items: &'a mut lang_items::LanguageItems,
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}
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/// Checks the crate for usage of weak lang items, returning a vector of all the
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/// language items required by this crate, but not defined yet.
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pub fn check_crate(krate: &ast::Crate,
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sess: &Session,
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items: &mut lang_items::LanguageItems) {
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// These are never called by user code, they're generated by the compiler.
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// They will never implicitly be added to the `missing` array unless we do
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// so here.
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if items.stack_exhausted().is_none() {
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items.missing.push(lang_items::StackExhaustedLangItem);
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}
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if items.eh_personality().is_none() {
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items.missing.push(lang_items::EhPersonalityLangItem);
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}
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{
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let mut cx = Context { sess: sess, items: items };
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visit::walk_crate(&mut cx, krate, ());
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}
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verify(sess, items);
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}
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pub fn link_name(attrs: &[ast::Attribute]) -> Option<InternedString> {
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lang_items::extract(attrs).and_then(|name| {
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$(if name.get() == stringify!($name) {
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Some(InternedString::new(stringify!($sym)))
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} else)* {
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None
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}
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})
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}
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fn verify(sess: &Session, items: &lang_items::LanguageItems) {
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// We only need to check for the presence of weak lang items if we're
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// emitting something that's not an rlib.
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let needs_check = sess.crate_types.borrow().iter().any(|kind| {
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match *kind {
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config::CrateTypeDylib |
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config::CrateTypeExecutable |
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config::CrateTypeStaticlib => true,
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config::CrateTypeRlib => false,
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}
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});
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if !needs_check { return }
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let mut missing = HashSet::new();
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sess.cstore.iter_crate_data(|cnum, _| {
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for item in csearch::get_missing_lang_items(&sess.cstore, cnum).iter() {
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missing.insert(*item);
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}
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});
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$(
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if missing.contains(&lang_items::$item) && items.$name().is_none() {
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sess.err(format!("language item required, but not found: `{}`",
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stringify!($name)).as_slice());
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}
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)*
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}
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impl<'a> Context<'a> {
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fn register(&mut self, name: &str, span: Span) {
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$(if name == stringify!($name) {
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if self.items.$name().is_none() {
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self.items.missing.push(lang_items::$item);
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}
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} else)* {
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self.sess.span_err(span,
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format!("unknown external lang item: `{}`",
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name).as_slice());
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}
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}
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}
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impl<'a> Visitor<()> for Context<'a> {
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fn visit_foreign_item(&mut self, i: &ast::ForeignItem, _: ()) {
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match lang_items::extract(i.attrs.as_slice()) {
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None => {}
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Some(lang_item) => self.register(lang_item.get(), i.span),
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}
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visit::walk_foreign_item(self, i, ())
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}
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}
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) )
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weak_lang_items!(
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begin_unwind, BeginUnwindLangItem, rust_begin_unwind;
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stack_exhausted, StackExhaustedLangItem, rust_stack_exhausted;
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eh_personality, EhPersonalityLangItem, rust_eh_personality;
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)
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