271 lines
11 KiB
Rust
271 lines
11 KiB
Rust
use rustc_attr as attr;
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use rustc_data_structures::fx::FxHashSet;
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use rustc_errors::struct_span_err;
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use rustc_hir as hir;
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use rustc_hir::itemlikevisit::ItemLikeVisitor;
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use rustc_middle::middle::cstore::NativeLib;
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use rustc_middle::ty::TyCtxt;
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use rustc_session::parse::feature_err;
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use rustc_session::utils::NativeLibKind;
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use rustc_session::Session;
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use rustc_span::source_map::Span;
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use rustc_span::symbol::{kw, sym, Symbol};
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use rustc_target::spec::abi::Abi;
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crate fn collect(tcx: TyCtxt<'_>) -> Vec<NativeLib> {
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let mut collector = Collector { tcx, libs: Vec::new() };
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tcx.hir().krate().visit_all_item_likes(&mut collector);
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collector.process_command_line();
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collector.libs
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}
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crate fn relevant_lib(sess: &Session, lib: &NativeLib) -> bool {
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match lib.cfg {
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Some(ref cfg) => attr::cfg_matches(cfg, &sess.parse_sess, None),
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None => true,
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}
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}
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struct Collector<'tcx> {
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tcx: TyCtxt<'tcx>,
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libs: Vec<NativeLib>,
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}
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impl ItemLikeVisitor<'tcx> for Collector<'tcx> {
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fn visit_item(&mut self, it: &'tcx hir::Item<'tcx>) {
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let abi = match it.kind {
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hir::ItemKind::ForeignMod { abi, .. } => abi,
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_ => return,
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};
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if abi == Abi::Rust || abi == Abi::RustIntrinsic || abi == Abi::PlatformIntrinsic {
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return;
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}
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// Process all of the #[link(..)]-style arguments
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let sess = &self.tcx.sess;
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for m in it.attrs.iter().filter(|a| sess.check_name(a, sym::link)) {
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let items = match m.meta_item_list() {
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Some(item) => item,
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None => continue,
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};
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let mut lib = NativeLib {
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name: None,
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kind: NativeLibKind::Unspecified,
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cfg: None,
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foreign_module: Some(self.tcx.hir().local_def_id(it.hir_id).to_def_id()),
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wasm_import_module: None,
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};
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let mut kind_specified = false;
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for item in items.iter() {
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if item.has_name(sym::kind) {
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kind_specified = true;
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let kind = match item.value_str() {
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Some(name) => name,
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None => continue, // skip like historical compilers
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};
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lib.kind = match &*kind.as_str() {
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"static" => NativeLibKind::StaticBundle,
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"static-nobundle" => NativeLibKind::StaticNoBundle,
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"dylib" => NativeLibKind::Dylib,
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"framework" => NativeLibKind::Framework,
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"raw-dylib" => NativeLibKind::RawDylib,
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k => {
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struct_span_err!(sess, item.span(), E0458, "unknown kind: `{}`", k)
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.span_label(item.span(), "unknown kind")
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.span_label(m.span, "")
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.emit();
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NativeLibKind::Unspecified
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}
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};
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} else if item.has_name(sym::name) {
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lib.name = item.value_str();
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} else if item.has_name(sym::cfg) {
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let cfg = match item.meta_item_list() {
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Some(list) => list,
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None => continue, // skip like historical compilers
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};
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if cfg.is_empty() {
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sess.span_err(item.span(), "`cfg()` must have an argument");
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} else if let cfg @ Some(..) = cfg[0].meta_item() {
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lib.cfg = cfg.cloned();
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} else {
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sess.span_err(cfg[0].span(), "invalid argument for `cfg(..)`");
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}
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} else if item.has_name(sym::wasm_import_module) {
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match item.value_str() {
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Some(s) => lib.wasm_import_module = Some(s),
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None => {
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let msg = "must be of the form `#[link(wasm_import_module = \"...\")]`";
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sess.span_err(item.span(), msg);
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}
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}
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} else {
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// currently, like past compilers, ignore unknown
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// directives here.
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}
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}
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// In general we require #[link(name = "...")] but we allow
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// #[link(wasm_import_module = "...")] without the `name`.
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let requires_name = kind_specified || lib.wasm_import_module.is_none();
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if lib.name.is_none() && requires_name {
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struct_span_err!(
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sess,
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m.span,
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E0459,
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"`#[link(...)]` specified without \
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`name = \"foo\"`"
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)
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.span_label(m.span, "missing `name` argument")
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.emit();
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}
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self.register_native_lib(Some(m.span), lib);
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}
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}
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fn visit_trait_item(&mut self, _it: &'tcx hir::TraitItem<'tcx>) {}
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fn visit_impl_item(&mut self, _it: &'tcx hir::ImplItem<'tcx>) {}
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fn visit_foreign_item(&mut self, _it: &'tcx hir::ForeignItem<'tcx>) {}
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}
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impl Collector<'tcx> {
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fn register_native_lib(&mut self, span: Option<Span>, lib: NativeLib) {
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if lib.name.as_ref().map(|&s| s == kw::Empty).unwrap_or(false) {
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match span {
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Some(span) => {
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struct_span_err!(
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self.tcx.sess,
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span,
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E0454,
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"`#[link(name = \"\")]` given with empty name"
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)
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.span_label(span, "empty name given")
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.emit();
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}
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None => {
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self.tcx.sess.err("empty library name given via `-l`");
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}
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}
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return;
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}
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let is_osx = self.tcx.sess.target.is_like_osx;
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if lib.kind == NativeLibKind::Framework && !is_osx {
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let msg = "native frameworks are only available on macOS targets";
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match span {
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Some(span) => struct_span_err!(self.tcx.sess, span, E0455, "{}", msg).emit(),
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None => self.tcx.sess.err(msg),
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}
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}
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if lib.cfg.is_some() && !self.tcx.features().link_cfg {
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feature_err(
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&self.tcx.sess.parse_sess,
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sym::link_cfg,
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span.unwrap(),
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"kind=\"link_cfg\" is unstable",
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)
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.emit();
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}
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if lib.kind == NativeLibKind::StaticNoBundle && !self.tcx.features().static_nobundle {
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feature_err(
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&self.tcx.sess.parse_sess,
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sym::static_nobundle,
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span.unwrap_or(rustc_span::DUMMY_SP),
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"kind=\"static-nobundle\" is unstable",
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)
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.emit();
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}
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if lib.kind == NativeLibKind::RawDylib && !self.tcx.features().raw_dylib {
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feature_err(
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&self.tcx.sess.parse_sess,
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sym::raw_dylib,
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span.unwrap_or(rustc_span::DUMMY_SP),
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"kind=\"raw-dylib\" is unstable",
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)
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.emit();
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}
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self.libs.push(lib);
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}
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// Process libs passed on the command line
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fn process_command_line(&mut self) {
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// First, check for errors
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let mut renames = FxHashSet::default();
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for (name, new_name, _) in &self.tcx.sess.opts.libs {
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if let Some(ref new_name) = new_name {
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let any_duplicate = self
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.libs
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.iter()
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.filter_map(|lib| lib.name.as_ref())
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.any(|n| &n.as_str() == name);
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if new_name.is_empty() {
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self.tcx.sess.err(&format!(
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"an empty renaming target was specified for library `{}`",
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name
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));
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} else if !any_duplicate {
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self.tcx.sess.err(&format!(
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"renaming of the library `{}` was specified, \
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however this crate contains no `#[link(...)]` \
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attributes referencing this library.",
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name
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));
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} else if !renames.insert(name) {
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self.tcx.sess.err(&format!(
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"multiple renamings were \
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specified for library `{}` .",
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name
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));
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}
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}
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}
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// Update kind and, optionally, the name of all native libraries
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// (there may be more than one) with the specified name. If any
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// library is mentioned more than once, keep the latest mention
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// of it, so that any possible dependent libraries appear before
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// it. (This ensures that the linker is able to see symbols from
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// all possible dependent libraries before linking in the library
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// in question.)
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for &(ref name, ref new_name, kind) in &self.tcx.sess.opts.libs {
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// If we've already added any native libraries with the same
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// name, they will be pulled out into `existing`, so that we
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// can move them to the end of the list below.
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let mut existing = self
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.libs
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.drain_filter(|lib| {
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if let Some(lib_name) = lib.name {
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if lib_name.as_str() == *name {
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if kind != NativeLibKind::Unspecified {
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lib.kind = kind;
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}
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if let Some(new_name) = new_name {
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lib.name = Some(Symbol::intern(new_name));
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}
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return true;
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}
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}
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false
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})
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.collect::<Vec<_>>();
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if existing.is_empty() {
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// Add if not found
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let new_name = new_name.as_ref().map(|s| &**s); // &Option<String> -> Option<&str>
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let lib = NativeLib {
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name: Some(Symbol::intern(new_name.unwrap_or(name))),
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kind,
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cfg: None,
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foreign_module: None,
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wasm_import_module: None,
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};
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self.register_native_lib(None, lib);
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} else {
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// Move all existing libraries with the same name to the
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// end of the command line.
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self.libs.append(&mut existing);
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}
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}
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}
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}
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