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use rustc_hir as hir;
use rustc_hir::itemlikevisit::ItemLikeVisitor;
use rustc_middle::ty::TyCtxt;
use rustc_span::symbol::{sym, Symbol};
use rustc_target::spec::abi::Abi;
crate fn collect(tcx: TyCtxt<'_>) -> Vec<String> {
let mut collector = Collector { tcx, args: Vec::new() };
tcx.hir().krate().visit_all_item_likes(&mut collector);
for attr in tcx.hir().krate().item.attrs.iter() {
if attr.has_name(sym::link_args) {
if let Some(linkarg) = attr.value_str() {
collector.add_link_args(linkarg);
}
}
}
collector.args
}
struct Collector<'tcx> {
tcx: TyCtxt<'tcx>,
args: Vec<String>,
}
impl<'tcx> ItemLikeVisitor<'tcx> for Collector<'tcx> {
fn visit_item(&mut self, it: &'tcx hir::Item<'tcx>) {
let fm = match it.kind {
hir::ItemKind::ForeignMod(ref fm) => fm,
_ => return,
};
if fm.abi == Abi::Rust || fm.abi == Abi::RustIntrinsic || fm.abi == Abi::PlatformIntrinsic {
return;
}
// First, add all of the custom #[link_args] attributes
let sess = &self.tcx.sess;
for m in it.attrs.iter().filter(|a| sess.check_name(a, sym::link_args)) {
if let Some(linkarg) = m.value_str() {
self.add_link_args(linkarg);
}
}
}
fn visit_trait_item(&mut self, _it: &'tcx hir::TraitItem<'tcx>) {}
fn visit_impl_item(&mut self, _it: &'tcx hir::ImplItem<'tcx>) {}
}
impl<'tcx> Collector<'tcx> {
fn add_link_args(&mut self, args: Symbol) {
self.args.extend(args.as_str().split(' ').filter(|s| !s.is_empty()).map(|s| s.to_string()))
}
}
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