1244 lines
48 KiB
Rust
1244 lines
48 KiB
Rust
//! This module implements some validity checks for attributes.
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//! In particular it verifies that `#[inline]` and `#[repr]` attributes are
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//! attached to items that actually support them and if there are
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//! conflicts between multiple such attributes attached to the same
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//! item.
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use rustc_middle::hir::map::Map;
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use rustc_middle::ty::query::Providers;
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use rustc_middle::ty::TyCtxt;
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use rustc_ast::{Attribute, LitKind, NestedMetaItem};
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use rustc_errors::{pluralize, struct_span_err};
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use rustc_hir as hir;
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use rustc_hir::def_id::LocalDefId;
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use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
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use rustc_hir::{
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self, FnSig, ForeignItem, ForeignItemKind, HirId, Item, ItemKind, TraitItem, CRATE_HIR_ID,
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};
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use rustc_hir::{MethodKind, Target};
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use rustc_session::lint::builtin::{CONFLICTING_REPR_HINTS, UNUSED_ATTRIBUTES};
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use rustc_session::parse::feature_err;
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use rustc_span::symbol::{sym, Symbol};
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use rustc_span::{Span, DUMMY_SP};
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pub(crate) fn target_from_impl_item<'tcx>(
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tcx: TyCtxt<'tcx>,
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impl_item: &hir::ImplItem<'_>,
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) -> Target {
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match impl_item.kind {
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hir::ImplItemKind::Const(..) => Target::AssocConst,
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hir::ImplItemKind::Fn(..) => {
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let parent_hir_id = tcx.hir().get_parent_item(impl_item.hir_id);
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let containing_item = tcx.hir().expect_item(parent_hir_id);
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let containing_impl_is_for_trait = match &containing_item.kind {
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hir::ItemKind::Impl(impl_) => impl_.of_trait.is_some(),
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_ => bug!("parent of an ImplItem must be an Impl"),
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};
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if containing_impl_is_for_trait {
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Target::Method(MethodKind::Trait { body: true })
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} else {
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Target::Method(MethodKind::Inherent)
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}
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}
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hir::ImplItemKind::TyAlias(..) => Target::AssocTy,
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}
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}
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#[derive(Clone, Copy)]
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enum ItemLike<'tcx> {
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Item(&'tcx Item<'tcx>),
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ForeignItem(&'tcx ForeignItem<'tcx>),
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}
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struct CheckAttrVisitor<'tcx> {
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tcx: TyCtxt<'tcx>,
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}
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impl CheckAttrVisitor<'tcx> {
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/// Checks any attribute.
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fn check_attributes(
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&self,
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hir_id: HirId,
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attrs: &'hir [Attribute],
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span: &Span,
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target: Target,
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item: Option<ItemLike<'_>>,
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) {
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let mut is_valid = true;
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for attr in attrs {
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is_valid &= if self.tcx.sess.check_name(attr, sym::inline) {
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self.check_inline(hir_id, attr, span, target)
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} else if self.tcx.sess.check_name(attr, sym::non_exhaustive) {
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self.check_non_exhaustive(hir_id, attr, span, target)
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} else if self.tcx.sess.check_name(attr, sym::marker) {
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self.check_marker(hir_id, attr, span, target)
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} else if self.tcx.sess.check_name(attr, sym::target_feature) {
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self.check_target_feature(hir_id, attr, span, target)
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} else if self.tcx.sess.check_name(attr, sym::track_caller) {
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self.check_track_caller(hir_id, &attr.span, attrs, span, target)
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} else if self.tcx.sess.check_name(attr, sym::doc) {
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self.check_doc_attrs(attr, hir_id, target)
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} else if self.tcx.sess.check_name(attr, sym::no_link) {
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self.check_no_link(hir_id, &attr, span, target)
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} else if self.tcx.sess.check_name(attr, sym::export_name) {
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self.check_export_name(hir_id, &attr, span, target)
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} else if self.tcx.sess.check_name(attr, sym::rustc_args_required_const) {
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self.check_rustc_args_required_const(&attr, span, target, item)
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} else if self.tcx.sess.check_name(attr, sym::allow_internal_unstable) {
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self.check_allow_internal_unstable(hir_id, &attr, span, target, &attrs)
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} else if self.tcx.sess.check_name(attr, sym::rustc_allow_const_fn_unstable) {
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self.check_rustc_allow_const_fn_unstable(hir_id, &attr, span, target)
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} else if self.tcx.sess.check_name(attr, sym::naked) {
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self.check_naked(hir_id, attr, span, target)
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} else {
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// lint-only checks
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if self.tcx.sess.check_name(attr, sym::cold) {
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self.check_cold(hir_id, attr, span, target);
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} else if self.tcx.sess.check_name(attr, sym::link_name) {
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self.check_link_name(hir_id, attr, span, target);
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} else if self.tcx.sess.check_name(attr, sym::link_section) {
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self.check_link_section(hir_id, attr, span, target);
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} else if self.tcx.sess.check_name(attr, sym::no_mangle) {
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self.check_no_mangle(hir_id, attr, span, target);
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}
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true
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};
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}
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if !is_valid {
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return;
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}
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if matches!(target, Target::Closure | Target::Fn | Target::Method(_) | Target::ForeignFn) {
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self.tcx.ensure().codegen_fn_attrs(self.tcx.hir().local_def_id(hir_id));
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}
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self.check_repr(attrs, span, target, item, hir_id);
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self.check_used(attrs, target);
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}
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fn inline_attr_str_error_with_macro_def(&self, hir_id: HirId, attr: &Attribute, sym: &str) {
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self.tcx.struct_span_lint_hir(UNUSED_ATTRIBUTES, hir_id, attr.span, |lint| {
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lint.build(&format!(
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"`#[{}]` is ignored on struct fields, match arms and macro defs",
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sym,
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))
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.warn(
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"this was previously accepted by the compiler but is \
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being phased out; it will become a hard error in \
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a future release!",
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)
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.note(
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"see issue #80564 <https://github.com/rust-lang/rust/issues/80564> \
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for more information",
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)
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.emit();
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});
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}
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fn inline_attr_str_error_without_macro_def(&self, hir_id: HirId, attr: &Attribute, sym: &str) {
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self.tcx.struct_span_lint_hir(UNUSED_ATTRIBUTES, hir_id, attr.span, |lint| {
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lint.build(&format!("`#[{}]` is ignored on struct fields and match arms", sym))
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.warn(
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"this was previously accepted by the compiler but is \
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being phased out; it will become a hard error in \
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a future release!",
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)
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.note(
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"see issue #80564 <https://github.com/rust-lang/rust/issues/80564> \
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for more information",
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)
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.emit();
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});
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}
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/// Checks if an `#[inline]` is applied to a function or a closure. Returns `true` if valid.
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fn check_inline(&self, hir_id: HirId, attr: &Attribute, span: &Span, target: Target) -> bool {
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match target {
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Target::Fn
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| Target::Closure
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| Target::Method(MethodKind::Trait { body: true } | MethodKind::Inherent) => true,
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Target::Method(MethodKind::Trait { body: false }) | Target::ForeignFn => {
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self.tcx.struct_span_lint_hir(UNUSED_ATTRIBUTES, hir_id, attr.span, |lint| {
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lint.build("`#[inline]` is ignored on function prototypes").emit()
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});
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true
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}
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// FIXME(#65833): We permit associated consts to have an `#[inline]` attribute with
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// just a lint, because we previously erroneously allowed it and some crates used it
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// accidentally, to to be compatible with crates depending on them, we can't throw an
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// error here.
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Target::AssocConst => {
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self.tcx.struct_span_lint_hir(UNUSED_ATTRIBUTES, hir_id, attr.span, |lint| {
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lint.build("`#[inline]` is ignored on constants")
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.warn(
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"this was previously accepted by the compiler but is \
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being phased out; it will become a hard error in \
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a future release!",
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)
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.note(
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"see issue #65833 <https://github.com/rust-lang/rust/issues/65833> \
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for more information",
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)
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.emit();
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});
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true
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}
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// FIXME(#80564): Same for fields, arms, and macro defs
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Target::Field | Target::Arm | Target::MacroDef => {
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self.inline_attr_str_error_with_macro_def(hir_id, attr, "inline");
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true
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}
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_ => {
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struct_span_err!(
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self.tcx.sess,
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attr.span,
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E0518,
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"attribute should be applied to function or closure",
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)
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.span_label(*span, "not a function or closure")
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.emit();
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false
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}
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}
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}
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/// Checks if `#[naked]` is applied to a function definition.
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fn check_naked(&self, hir_id: HirId, attr: &Attribute, span: &Span, target: Target) -> bool {
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match target {
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Target::Fn
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| Target::Method(MethodKind::Trait { body: true } | MethodKind::Inherent) => true,
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// FIXME(#80564): We permit struct fields, match arms and macro defs to have an
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// `#[allow_internal_unstable]` attribute with just a lint, because we previously
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// erroneously allowed it and some crates used it accidentally, to to be compatible
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// with crates depending on them, we can't throw an error here.
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Target::Field | Target::Arm | Target::MacroDef => {
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self.inline_attr_str_error_with_macro_def(hir_id, attr, "naked");
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true
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}
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_ => {
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self.tcx
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.sess
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.struct_span_err(
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attr.span,
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"attribute should be applied to a function definition",
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)
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.span_label(*span, "not a function definition")
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.emit();
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false
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}
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}
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}
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/// Checks if a `#[track_caller]` is applied to a non-naked function. Returns `true` if valid.
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fn check_track_caller(
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&self,
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hir_id: HirId,
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attr_span: &Span,
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attrs: &'hir [Attribute],
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span: &Span,
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target: Target,
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) -> bool {
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match target {
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_ if attrs.iter().any(|attr| attr.has_name(sym::naked)) => {
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struct_span_err!(
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self.tcx.sess,
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*attr_span,
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E0736,
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"cannot use `#[track_caller]` with `#[naked]`",
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)
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.emit();
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false
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}
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Target::Fn | Target::Method(..) | Target::ForeignFn | Target::Closure => true,
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// FIXME(#80564): We permit struct fields, match arms and macro defs to have an
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// `#[track_caller]` attribute with just a lint, because we previously
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// erroneously allowed it and some crates used it accidentally, to to be compatible
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// with crates depending on them, we can't throw an error here.
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Target::Field | Target::Arm | Target::MacroDef => {
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for attr in attrs {
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self.inline_attr_str_error_with_macro_def(hir_id, attr, "track_caller");
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}
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true
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}
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_ => {
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struct_span_err!(
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self.tcx.sess,
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*attr_span,
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E0739,
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"attribute should be applied to function"
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)
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.span_label(*span, "not a function")
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.emit();
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false
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}
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}
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}
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/// Checks if the `#[non_exhaustive]` attribute on an `item` is valid. Returns `true` if valid.
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fn check_non_exhaustive(
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&self,
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hir_id: HirId,
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attr: &Attribute,
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span: &Span,
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target: Target,
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) -> bool {
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match target {
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Target::Struct | Target::Enum | Target::Variant => true,
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// FIXME(#80564): We permit struct fields, match arms and macro defs to have an
|
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// `#[non_exhaustive]` attribute with just a lint, because we previously
|
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// erroneously allowed it and some crates used it accidentally, to to be compatible
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// with crates depending on them, we can't throw an error here.
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Target::Field | Target::Arm | Target::MacroDef => {
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self.inline_attr_str_error_with_macro_def(hir_id, attr, "non_exhaustive");
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true
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}
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_ => {
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struct_span_err!(
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self.tcx.sess,
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attr.span,
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E0701,
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"attribute can only be applied to a struct or enum"
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)
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.span_label(*span, "not a struct or enum")
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.emit();
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false
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|
}
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}
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}
|
|
|
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/// Checks if the `#[marker]` attribute on an `item` is valid. Returns `true` if valid.
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fn check_marker(&self, hir_id: HirId, attr: &Attribute, span: &Span, target: Target) -> bool {
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match target {
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Target::Trait => true,
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// FIXME(#80564): We permit struct fields, match arms and macro defs to have an
|
|
// `#[marker]` attribute with just a lint, because we previously
|
|
// erroneously allowed it and some crates used it accidentally, to to be compatible
|
|
// with crates depending on them, we can't throw an error here.
|
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Target::Field | Target::Arm | Target::MacroDef => {
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self.inline_attr_str_error_with_macro_def(hir_id, attr, "marker");
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true
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|
}
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_ => {
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self.tcx
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.sess
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.struct_span_err(attr.span, "attribute can only be applied to a trait")
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.span_label(*span, "not a trait")
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.emit();
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false
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}
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}
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}
|
|
|
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/// Checks if the `#[target_feature]` attribute on `item` is valid. Returns `true` if valid.
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fn check_target_feature(
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&self,
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hir_id: HirId,
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attr: &Attribute,
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span: &Span,
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target: Target,
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) -> bool {
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match target {
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|
Target::Fn
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|
| Target::Method(MethodKind::Trait { body: true } | MethodKind::Inherent) => true,
|
|
// FIXME: #[target_feature] was previously erroneously allowed on statements and some
|
|
// crates used this, so only emit a warning.
|
|
Target::Statement => {
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self.tcx.struct_span_lint_hir(UNUSED_ATTRIBUTES, hir_id, attr.span, |lint| {
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|
lint.build("attribute should be applied to a function")
|
|
.warn(
|
|
"this was previously accepted by the compiler but is \
|
|
being phased out; it will become a hard error in \
|
|
a future release!",
|
|
)
|
|
.span_label(*span, "not a function")
|
|
.emit();
|
|
});
|
|
true
|
|
}
|
|
// FIXME(#80564): We permit struct fields, match arms and macro defs to have an
|
|
// `#[target_feature]` attribute with just a lint, because we previously
|
|
// erroneously allowed it and some crates used it accidentally, to to be compatible
|
|
// with crates depending on them, we can't throw an error here.
|
|
Target::Field | Target::Arm | Target::MacroDef => {
|
|
self.inline_attr_str_error_with_macro_def(hir_id, attr, "target_feature");
|
|
true
|
|
}
|
|
_ => {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(attr.span, "attribute should be applied to a function")
|
|
.span_label(*span, "not a function")
|
|
.emit();
|
|
false
|
|
}
|
|
}
|
|
}
|
|
|
|
fn doc_attr_str_error(&self, meta: &NestedMetaItem, attr_name: &str) {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(
|
|
meta.span(),
|
|
&format!("doc {0} attribute expects a string: #[doc({0} = \"a\")]", attr_name),
|
|
)
|
|
.emit();
|
|
}
|
|
|
|
fn check_doc_alias(&self, meta: &NestedMetaItem, hir_id: HirId, target: Target) -> bool {
|
|
let doc_alias = meta.value_str().map(|s| s.to_string()).unwrap_or_else(String::new);
|
|
if doc_alias.is_empty() {
|
|
self.doc_attr_str_error(meta, "alias");
|
|
return false;
|
|
}
|
|
if let Some(c) =
|
|
doc_alias.chars().find(|&c| c == '"' || c == '\'' || (c.is_whitespace() && c != ' '))
|
|
{
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(
|
|
meta.name_value_literal_span().unwrap_or_else(|| meta.span()),
|
|
&format!("{:?} character isn't allowed in `#[doc(alias = \"...\")]`", c),
|
|
)
|
|
.emit();
|
|
return false;
|
|
}
|
|
if doc_alias.starts_with(' ') || doc_alias.ends_with(' ') {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(
|
|
meta.name_value_literal_span().unwrap_or_else(|| meta.span()),
|
|
"`#[doc(alias = \"...\")]` cannot start or end with ' '",
|
|
)
|
|
.emit();
|
|
return false;
|
|
}
|
|
if let Some(err) = match target {
|
|
Target::Impl => Some("implementation block"),
|
|
Target::ForeignMod => Some("extern block"),
|
|
Target::AssocTy => {
|
|
let parent_hir_id = self.tcx.hir().get_parent_item(hir_id);
|
|
let containing_item = self.tcx.hir().expect_item(parent_hir_id);
|
|
if Target::from_item(containing_item) == Target::Impl {
|
|
Some("type alias in implementation block")
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
Target::AssocConst => {
|
|
let parent_hir_id = self.tcx.hir().get_parent_item(hir_id);
|
|
let containing_item = self.tcx.hir().expect_item(parent_hir_id);
|
|
// We can't link to trait impl's consts.
|
|
let err = "associated constant in trait implementation block";
|
|
match containing_item.kind {
|
|
ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }) => Some(err),
|
|
_ => None,
|
|
}
|
|
}
|
|
_ => None,
|
|
} {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(
|
|
meta.span(),
|
|
&format!("`#[doc(alias = \"...\")]` isn't allowed on {}", err),
|
|
)
|
|
.emit();
|
|
return false;
|
|
}
|
|
let item_name = self.tcx.hir().name(hir_id);
|
|
if &*item_name.as_str() == doc_alias {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(
|
|
meta.span(),
|
|
&format!("`#[doc(alias = \"...\")]` is the same as the item's name"),
|
|
)
|
|
.emit();
|
|
return false;
|
|
}
|
|
true
|
|
}
|
|
|
|
fn check_doc_keyword(&self, meta: &NestedMetaItem, hir_id: HirId) -> bool {
|
|
let doc_keyword = meta.value_str().map(|s| s.to_string()).unwrap_or_else(String::new);
|
|
if doc_keyword.is_empty() {
|
|
self.doc_attr_str_error(meta, "keyword");
|
|
return false;
|
|
}
|
|
match self.tcx.hir().expect_item(hir_id).kind {
|
|
ItemKind::Mod(ref module) => {
|
|
if !module.item_ids.is_empty() {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(
|
|
meta.span(),
|
|
"`#[doc(keyword = \"...\")]` can only be used on empty modules",
|
|
)
|
|
.emit();
|
|
return false;
|
|
}
|
|
}
|
|
_ => {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(
|
|
meta.span(),
|
|
"`#[doc(keyword = \"...\")]` can only be used on modules",
|
|
)
|
|
.emit();
|
|
return false;
|
|
}
|
|
}
|
|
if !rustc_lexer::is_ident(&doc_keyword) {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(
|
|
meta.name_value_literal_span().unwrap_or_else(|| meta.span()),
|
|
&format!("`{}` is not a valid identifier", doc_keyword),
|
|
)
|
|
.emit();
|
|
return false;
|
|
}
|
|
true
|
|
}
|
|
|
|
fn check_attr_crate_level(
|
|
&self,
|
|
meta: &NestedMetaItem,
|
|
hir_id: HirId,
|
|
attr_name: &str,
|
|
) -> bool {
|
|
if CRATE_HIR_ID == hir_id {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(
|
|
meta.span(),
|
|
&format!(
|
|
"`#![doc({} = \"...\")]` isn't allowed as a crate level attribute",
|
|
attr_name,
|
|
),
|
|
)
|
|
.emit();
|
|
return false;
|
|
}
|
|
true
|
|
}
|
|
|
|
fn check_doc_attrs(&self, attr: &Attribute, hir_id: HirId, target: Target) -> bool {
|
|
if let Some(mi) = attr.meta() {
|
|
if let Some(list) = mi.meta_item_list() {
|
|
for meta in list {
|
|
if meta.has_name(sym::alias) {
|
|
if !self.check_attr_crate_level(meta, hir_id, "alias")
|
|
|| !self.check_doc_alias(meta, hir_id, target)
|
|
{
|
|
return false;
|
|
}
|
|
} else if meta.has_name(sym::keyword) {
|
|
if !self.check_attr_crate_level(meta, hir_id, "keyword")
|
|
|| !self.check_doc_keyword(meta, hir_id)
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
true
|
|
}
|
|
|
|
/// Checks if `#[cold]` is applied to a non-function. Returns `true` if valid.
|
|
fn check_cold(&self, hir_id: HirId, attr: &Attribute, span: &Span, target: Target) {
|
|
match target {
|
|
Target::Fn | Target::Method(..) | Target::ForeignFn | Target::Closure => {}
|
|
// FIXME(#80564): We permit struct fields, match arms and macro defs to have an
|
|
// `#[cold]` attribute with just a lint, because we previously
|
|
// erroneously allowed it and some crates used it accidentally, to to be compatible
|
|
// with crates depending on them, we can't throw an error here.
|
|
Target::Field | Target::Arm | Target::MacroDef => {
|
|
self.inline_attr_str_error_with_macro_def(hir_id, attr, "cold");
|
|
}
|
|
_ => {
|
|
// FIXME: #[cold] was previously allowed on non-functions and some crates used
|
|
// this, so only emit a warning.
|
|
self.tcx.struct_span_lint_hir(UNUSED_ATTRIBUTES, hir_id, attr.span, |lint| {
|
|
lint.build("attribute should be applied to a function")
|
|
.warn(
|
|
"this was previously accepted by the compiler but is \
|
|
being phased out; it will become a hard error in \
|
|
a future release!",
|
|
)
|
|
.span_label(*span, "not a function")
|
|
.emit();
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Checks if `#[link_name]` is applied to an item other than a foreign function or static.
|
|
fn check_link_name(&self, hir_id: HirId, attr: &Attribute, span: &Span, target: Target) {
|
|
match target {
|
|
Target::ForeignFn | Target::ForeignStatic => {}
|
|
// FIXME(#80564): We permit struct fields, match arms and macro defs to have an
|
|
// `#[link_name]` attribute with just a lint, because we previously
|
|
// erroneously allowed it and some crates used it accidentally, to to be compatible
|
|
// with crates depending on them, we can't throw an error here.
|
|
Target::Field | Target::Arm | Target::MacroDef => {
|
|
self.inline_attr_str_error_with_macro_def(hir_id, attr, "link_name");
|
|
}
|
|
_ => {
|
|
// FIXME: #[cold] was previously allowed on non-functions/statics and some crates
|
|
// used this, so only emit a warning.
|
|
self.tcx.struct_span_lint_hir(UNUSED_ATTRIBUTES, hir_id, attr.span, |lint| {
|
|
let mut diag =
|
|
lint.build("attribute should be applied to a foreign function or static");
|
|
diag.warn(
|
|
"this was previously accepted by the compiler but is \
|
|
being phased out; it will become a hard error in \
|
|
a future release!",
|
|
);
|
|
|
|
// See issue #47725
|
|
if let Target::ForeignMod = target {
|
|
if let Some(value) = attr.value_str() {
|
|
diag.span_help(
|
|
attr.span,
|
|
&format!(r#"try `#[link(name = "{}")]` instead"#, value),
|
|
);
|
|
} else {
|
|
diag.span_help(attr.span, r#"try `#[link(name = "...")]` instead"#);
|
|
}
|
|
}
|
|
|
|
diag.span_label(*span, "not a foreign function or static");
|
|
diag.emit();
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Checks if `#[no_link]` is applied to an `extern crate`. Returns `true` if valid.
|
|
fn check_no_link(&self, hir_id: HirId, attr: &Attribute, span: &Span, target: Target) -> bool {
|
|
match target {
|
|
Target::ExternCrate => true,
|
|
// FIXME(#80564): We permit struct fields, match arms and macro defs to have an
|
|
// `#[no_link]` attribute with just a lint, because we previously
|
|
// erroneously allowed it and some crates used it accidentally, to to be compatible
|
|
// with crates depending on them, we can't throw an error here.
|
|
Target::Field | Target::Arm | Target::MacroDef => {
|
|
self.inline_attr_str_error_with_macro_def(hir_id, attr, "no_link");
|
|
true
|
|
}
|
|
_ => {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(
|
|
attr.span,
|
|
"attribute should be applied to an `extern crate` item",
|
|
)
|
|
.span_label(*span, "not an `extern crate` item")
|
|
.emit();
|
|
false
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Checks if `#[export_name]` is applied to a function or static. Returns `true` if valid.
|
|
fn check_export_name(
|
|
&self,
|
|
hir_id: HirId,
|
|
attr: &Attribute,
|
|
span: &Span,
|
|
target: Target,
|
|
) -> bool {
|
|
match target {
|
|
Target::Static | Target::Fn | Target::Method(..) => true,
|
|
// FIXME(#80564): We permit struct fields, match arms and macro defs to have an
|
|
// `#[export_name]` attribute with just a lint, because we previously
|
|
// erroneously allowed it and some crates used it accidentally, to to be compatible
|
|
// with crates depending on them, we can't throw an error here.
|
|
Target::Field | Target::Arm | Target::MacroDef => {
|
|
self.inline_attr_str_error_with_macro_def(hir_id, attr, "export_name");
|
|
true
|
|
}
|
|
_ => {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(
|
|
attr.span,
|
|
"attribute should be applied to a function or static",
|
|
)
|
|
.span_label(*span, "not a function or static")
|
|
.emit();
|
|
false
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Checks if `#[rustc_args_required_const]` is applied to a function and has a valid argument.
|
|
fn check_rustc_args_required_const(
|
|
&self,
|
|
attr: &Attribute,
|
|
span: &Span,
|
|
target: Target,
|
|
item: Option<ItemLike<'_>>,
|
|
) -> bool {
|
|
let is_function = matches!(target, Target::Fn | Target::Method(..) | Target::ForeignFn);
|
|
if !is_function {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(attr.span, "attribute should be applied to a function")
|
|
.span_label(*span, "not a function")
|
|
.emit();
|
|
return false;
|
|
}
|
|
|
|
let list = match attr.meta_item_list() {
|
|
// The attribute form is validated on AST.
|
|
None => return false,
|
|
Some(it) => it,
|
|
};
|
|
|
|
let mut invalid_args = vec![];
|
|
for meta in list {
|
|
if let Some(LitKind::Int(val, _)) = meta.literal().map(|lit| &lit.kind) {
|
|
if let Some(ItemLike::Item(Item {
|
|
kind: ItemKind::Fn(FnSig { decl, .. }, ..),
|
|
..
|
|
}))
|
|
| Some(ItemLike::ForeignItem(ForeignItem {
|
|
kind: ForeignItemKind::Fn(decl, ..),
|
|
..
|
|
})) = item
|
|
{
|
|
let arg_count = decl.inputs.len() as u128;
|
|
if *val >= arg_count {
|
|
let span = meta.span();
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(span, "index exceeds number of arguments")
|
|
.span_label(
|
|
span,
|
|
format!(
|
|
"there {} only {} argument{}",
|
|
if arg_count != 1 { "are" } else { "is" },
|
|
arg_count,
|
|
pluralize!(arg_count)
|
|
),
|
|
)
|
|
.emit();
|
|
return false;
|
|
}
|
|
} else {
|
|
bug!("should be a function item");
|
|
}
|
|
} else {
|
|
invalid_args.push(meta.span());
|
|
}
|
|
}
|
|
|
|
if !invalid_args.is_empty() {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(invalid_args, "arguments should be non-negative integers")
|
|
.emit();
|
|
false
|
|
} else {
|
|
true
|
|
}
|
|
}
|
|
|
|
/// Checks if `#[link_section]` is applied to a function or static.
|
|
fn check_link_section(&self, hir_id: HirId, attr: &Attribute, span: &Span, target: Target) {
|
|
match target {
|
|
Target::Static | Target::Fn | Target::Method(..) => {}
|
|
// FIXME(#80564): We permit struct fields, match arms and macro defs to have an
|
|
// `#[link_section]` attribute with just a lint, because we previously
|
|
// erroneously allowed it and some crates used it accidentally, to to be compatible
|
|
// with crates depending on them, we can't throw an error here.
|
|
Target::Field | Target::Arm | Target::MacroDef => {
|
|
self.inline_attr_str_error_with_macro_def(hir_id, attr, "link_section");
|
|
}
|
|
_ => {
|
|
// FIXME: #[link_section] was previously allowed on non-functions/statics and some
|
|
// crates used this, so only emit a warning.
|
|
self.tcx.struct_span_lint_hir(UNUSED_ATTRIBUTES, hir_id, attr.span, |lint| {
|
|
lint.build("attribute should be applied to a function or static")
|
|
.warn(
|
|
"this was previously accepted by the compiler but is \
|
|
being phased out; it will become a hard error in \
|
|
a future release!",
|
|
)
|
|
.span_label(*span, "not a function or static")
|
|
.emit();
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Checks if `#[no_mangle]` is applied to a function or static.
|
|
fn check_no_mangle(&self, hir_id: HirId, attr: &Attribute, span: &Span, target: Target) {
|
|
match target {
|
|
Target::Static | Target::Fn | Target::Method(..) => {}
|
|
// FIXME(#80564): We permit struct fields, match arms and macro defs to have an
|
|
// `#[no_mangle]` attribute with just a lint, because we previously
|
|
// erroneously allowed it and some crates used it accidentally, to to be compatible
|
|
// with crates depending on them, we can't throw an error here.
|
|
Target::Field | Target::Arm | Target::MacroDef => {
|
|
self.inline_attr_str_error_with_macro_def(hir_id, attr, "no_mangle");
|
|
}
|
|
_ => {
|
|
// FIXME: #[no_mangle] was previously allowed on non-functions/statics and some
|
|
// crates used this, so only emit a warning.
|
|
self.tcx.struct_span_lint_hir(UNUSED_ATTRIBUTES, hir_id, attr.span, |lint| {
|
|
lint.build("attribute should be applied to a function or static")
|
|
.warn(
|
|
"this was previously accepted by the compiler but is \
|
|
being phased out; it will become a hard error in \
|
|
a future release!",
|
|
)
|
|
.span_label(*span, "not a function or static")
|
|
.emit();
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Checks if the `#[repr]` attributes on `item` are valid.
|
|
fn check_repr(
|
|
&self,
|
|
attrs: &'hir [Attribute],
|
|
span: &Span,
|
|
target: Target,
|
|
item: Option<ItemLike<'_>>,
|
|
hir_id: HirId,
|
|
) {
|
|
// Extract the names of all repr hints, e.g., [foo, bar, align] for:
|
|
// ```
|
|
// #[repr(foo)]
|
|
// #[repr(bar, align(8))]
|
|
// ```
|
|
let hints: Vec<_> = attrs
|
|
.iter()
|
|
.filter(|attr| self.tcx.sess.check_name(attr, sym::repr))
|
|
.filter_map(|attr| attr.meta_item_list())
|
|
.flatten()
|
|
.collect();
|
|
|
|
let mut int_reprs = 0;
|
|
let mut is_c = false;
|
|
let mut is_simd = false;
|
|
let mut is_transparent = false;
|
|
|
|
for hint in &hints {
|
|
let (article, allowed_targets) = match hint.name_or_empty() {
|
|
_ if !matches!(target, Target::Struct | Target::Enum | Target::Union) => {
|
|
("a", "struct, enum, or union")
|
|
}
|
|
name @ sym::C | name @ sym::align => {
|
|
is_c |= name == sym::C;
|
|
match target {
|
|
Target::Struct | Target::Union | Target::Enum => continue,
|
|
_ => ("a", "struct, enum, or union"),
|
|
}
|
|
}
|
|
sym::packed => {
|
|
if target != Target::Struct && target != Target::Union {
|
|
("a", "struct or union")
|
|
} else {
|
|
continue;
|
|
}
|
|
}
|
|
sym::simd => {
|
|
is_simd = true;
|
|
if target != Target::Struct {
|
|
("a", "struct")
|
|
} else {
|
|
continue;
|
|
}
|
|
}
|
|
sym::transparent => {
|
|
is_transparent = true;
|
|
match target {
|
|
Target::Struct | Target::Union | Target::Enum => continue,
|
|
_ => ("a", "struct, enum, or union"),
|
|
}
|
|
}
|
|
sym::no_niche => {
|
|
if !self.tcx.features().enabled(sym::no_niche) {
|
|
feature_err(
|
|
&self.tcx.sess.parse_sess,
|
|
sym::no_niche,
|
|
hint.span(),
|
|
"the attribute `repr(no_niche)` is currently unstable",
|
|
)
|
|
.emit();
|
|
}
|
|
match target {
|
|
Target::Struct | Target::Enum => continue,
|
|
_ => ("a", "struct or enum"),
|
|
}
|
|
}
|
|
sym::i8
|
|
| sym::u8
|
|
| sym::i16
|
|
| sym::u16
|
|
| sym::i32
|
|
| sym::u32
|
|
| sym::i64
|
|
| sym::u64
|
|
| sym::i128
|
|
| sym::u128
|
|
| sym::isize
|
|
| sym::usize => {
|
|
int_reprs += 1;
|
|
if target != Target::Enum {
|
|
("an", "enum")
|
|
} else {
|
|
continue;
|
|
}
|
|
}
|
|
_ => continue,
|
|
};
|
|
|
|
struct_span_err!(
|
|
self.tcx.sess,
|
|
hint.span(),
|
|
E0517,
|
|
"{}",
|
|
&format!("attribute should be applied to {} {}", article, allowed_targets)
|
|
)
|
|
.span_label(*span, &format!("not {} {}", article, allowed_targets))
|
|
.emit();
|
|
}
|
|
|
|
// Just point at all repr hints if there are any incompatibilities.
|
|
// This is not ideal, but tracking precisely which ones are at fault is a huge hassle.
|
|
let hint_spans = hints.iter().map(|hint| hint.span());
|
|
|
|
// Error on repr(transparent, <anything else apart from no_niche>).
|
|
let non_no_niche = |hint: &&NestedMetaItem| hint.name_or_empty() != sym::no_niche;
|
|
let non_no_niche_count = hints.iter().filter(non_no_niche).count();
|
|
if is_transparent && non_no_niche_count > 1 {
|
|
let hint_spans: Vec<_> = hint_spans.clone().collect();
|
|
struct_span_err!(
|
|
self.tcx.sess,
|
|
hint_spans,
|
|
E0692,
|
|
"transparent {} cannot have other repr hints",
|
|
target
|
|
)
|
|
.emit();
|
|
}
|
|
// Warn on repr(u8, u16), repr(C, simd), and c-like-enum-repr(C, u8)
|
|
if (int_reprs > 1)
|
|
|| (is_simd && is_c)
|
|
|| (int_reprs == 1
|
|
&& is_c
|
|
&& item.map_or(false, |item| {
|
|
if let ItemLike::Item(item) = item {
|
|
return is_c_like_enum(item);
|
|
}
|
|
return false;
|
|
}))
|
|
{
|
|
self.tcx.struct_span_lint_hir(
|
|
CONFLICTING_REPR_HINTS,
|
|
hir_id,
|
|
hint_spans.collect::<Vec<Span>>(),
|
|
|lint| {
|
|
lint.build("conflicting representation hints")
|
|
.code(rustc_errors::error_code!(E0566))
|
|
.emit();
|
|
},
|
|
);
|
|
}
|
|
}
|
|
|
|
fn check_used(&self, attrs: &'hir [Attribute], target: Target) {
|
|
for attr in attrs {
|
|
if self.tcx.sess.check_name(attr, sym::used) && target != Target::Static {
|
|
self.tcx
|
|
.sess
|
|
.span_err(attr.span, "attribute must be applied to a `static` variable");
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Outputs an error for `#[allow_internal_unstable]` which can only be applied to macros.
|
|
/// (Allows proc_macro functions)
|
|
fn check_allow_internal_unstable(
|
|
&self,
|
|
hir_id: HirId,
|
|
attr: &Attribute,
|
|
span: &Span,
|
|
target: Target,
|
|
attrs: &[Attribute],
|
|
) -> bool {
|
|
debug!("Checking target: {:?}", target);
|
|
match target {
|
|
Target::Fn => {
|
|
for attr in attrs {
|
|
if self.tcx.sess.is_proc_macro_attr(attr) {
|
|
debug!("Is proc macro attr");
|
|
return true;
|
|
}
|
|
}
|
|
debug!("Is not proc macro attr");
|
|
false
|
|
}
|
|
Target::MacroDef => true,
|
|
// FIXME(#80564): We permit struct fields and match arms to have an
|
|
// `#[allow_internal_unstable]` attribute with just a lint, because we previously
|
|
// erroneously allowed it and some crates used it accidentally, to to be compatible
|
|
// with crates depending on them, we can't throw an error here.
|
|
Target::Field | Target::Arm => {
|
|
self.inline_attr_str_error_without_macro_def(
|
|
hir_id,
|
|
attr,
|
|
"allow_internal_unstable",
|
|
);
|
|
true
|
|
}
|
|
_ => {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(attr.span, "attribute should be applied to a macro")
|
|
.span_label(*span, "not a macro")
|
|
.emit();
|
|
false
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Outputs an error for `#[allow_internal_unstable]` which can only be applied to macros.
|
|
/// (Allows proc_macro functions)
|
|
fn check_rustc_allow_const_fn_unstable(
|
|
&self,
|
|
hir_id: HirId,
|
|
attr: &Attribute,
|
|
span: &Span,
|
|
target: Target,
|
|
) -> bool {
|
|
match target {
|
|
Target::Fn | Target::Method(_)
|
|
if self.tcx.is_const_fn_raw(self.tcx.hir().local_def_id(hir_id)) =>
|
|
{
|
|
true
|
|
}
|
|
// FIXME(#80564): We permit struct fields and match arms to have an
|
|
// `#[allow_internal_unstable]` attribute with just a lint, because we previously
|
|
// erroneously allowed it and some crates used it accidentally, to to be compatible
|
|
// with crates depending on them, we can't throw an error here.
|
|
Target::Field | Target::Arm | Target::MacroDef => {
|
|
self.inline_attr_str_error_with_macro_def(hir_id, attr, "allow_internal_unstable");
|
|
true
|
|
}
|
|
_ => {
|
|
self.tcx
|
|
.sess
|
|
.struct_span_err(attr.span, "attribute should be applied to `const fn`")
|
|
.span_label(*span, "not a `const fn`")
|
|
.emit();
|
|
false
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Visitor<'tcx> for CheckAttrVisitor<'tcx> {
|
|
type Map = Map<'tcx>;
|
|
|
|
fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
|
|
NestedVisitorMap::OnlyBodies(self.tcx.hir())
|
|
}
|
|
|
|
fn visit_item(&mut self, item: &'tcx Item<'tcx>) {
|
|
let target = Target::from_item(item);
|
|
self.check_attributes(
|
|
item.hir_id,
|
|
item.attrs,
|
|
&item.span,
|
|
target,
|
|
Some(ItemLike::Item(item)),
|
|
);
|
|
intravisit::walk_item(self, item)
|
|
}
|
|
|
|
fn visit_generic_param(&mut self, generic_param: &'tcx hir::GenericParam<'tcx>) {
|
|
let target = Target::from_generic_param(generic_param);
|
|
self.check_attributes(
|
|
generic_param.hir_id,
|
|
generic_param.attrs,
|
|
&generic_param.span,
|
|
target,
|
|
None,
|
|
);
|
|
intravisit::walk_generic_param(self, generic_param)
|
|
}
|
|
|
|
fn visit_trait_item(&mut self, trait_item: &'tcx TraitItem<'tcx>) {
|
|
let target = Target::from_trait_item(trait_item);
|
|
self.check_attributes(trait_item.hir_id, &trait_item.attrs, &trait_item.span, target, None);
|
|
intravisit::walk_trait_item(self, trait_item)
|
|
}
|
|
|
|
fn visit_struct_field(&mut self, struct_field: &'tcx hir::StructField<'tcx>) {
|
|
self.check_attributes(
|
|
struct_field.hir_id,
|
|
&struct_field.attrs,
|
|
&struct_field.span,
|
|
Target::Field,
|
|
None,
|
|
);
|
|
intravisit::walk_struct_field(self, struct_field);
|
|
}
|
|
|
|
fn visit_arm(&mut self, arm: &'tcx hir::Arm<'tcx>) {
|
|
self.check_attributes(arm.hir_id, &arm.attrs, &arm.span, Target::Arm, None);
|
|
intravisit::walk_arm(self, arm);
|
|
}
|
|
|
|
fn visit_foreign_item(&mut self, f_item: &'tcx ForeignItem<'tcx>) {
|
|
let target = Target::from_foreign_item(f_item);
|
|
self.check_attributes(
|
|
f_item.hir_id,
|
|
&f_item.attrs,
|
|
&f_item.span,
|
|
target,
|
|
Some(ItemLike::ForeignItem(f_item)),
|
|
);
|
|
intravisit::walk_foreign_item(self, f_item)
|
|
}
|
|
|
|
fn visit_impl_item(&mut self, impl_item: &'tcx hir::ImplItem<'tcx>) {
|
|
let target = target_from_impl_item(self.tcx, impl_item);
|
|
self.check_attributes(impl_item.hir_id, &impl_item.attrs, &impl_item.span, target, None);
|
|
intravisit::walk_impl_item(self, impl_item)
|
|
}
|
|
|
|
fn visit_stmt(&mut self, stmt: &'tcx hir::Stmt<'tcx>) {
|
|
// When checking statements ignore expressions, they will be checked later.
|
|
if let hir::StmtKind::Local(ref l) = stmt.kind {
|
|
self.check_attributes(l.hir_id, &l.attrs, &stmt.span, Target::Statement, None);
|
|
}
|
|
intravisit::walk_stmt(self, stmt)
|
|
}
|
|
|
|
fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
|
|
let target = match expr.kind {
|
|
hir::ExprKind::Closure(..) => Target::Closure,
|
|
_ => Target::Expression,
|
|
};
|
|
|
|
self.check_attributes(expr.hir_id, &expr.attrs, &expr.span, target, None);
|
|
intravisit::walk_expr(self, expr)
|
|
}
|
|
|
|
fn visit_variant(
|
|
&mut self,
|
|
variant: &'tcx hir::Variant<'tcx>,
|
|
generics: &'tcx hir::Generics<'tcx>,
|
|
item_id: HirId,
|
|
) {
|
|
self.check_attributes(variant.id, variant.attrs, &variant.span, Target::Variant, None);
|
|
intravisit::walk_variant(self, variant, generics, item_id)
|
|
}
|
|
|
|
fn visit_macro_def(&mut self, macro_def: &'tcx hir::MacroDef<'tcx>) {
|
|
self.check_attributes(
|
|
macro_def.hir_id,
|
|
macro_def.attrs,
|
|
¯o_def.span,
|
|
Target::MacroDef,
|
|
None,
|
|
);
|
|
intravisit::walk_macro_def(self, macro_def);
|
|
}
|
|
|
|
fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) {
|
|
self.check_attributes(param.hir_id, param.attrs, ¶m.span, Target::Param, None);
|
|
|
|
intravisit::walk_param(self, param);
|
|
}
|
|
}
|
|
|
|
fn is_c_like_enum(item: &Item<'_>) -> bool {
|
|
if let ItemKind::Enum(ref def, _) = item.kind {
|
|
for variant in def.variants {
|
|
match variant.data {
|
|
hir::VariantData::Unit(..) => { /* continue */ }
|
|
_ => return false,
|
|
}
|
|
}
|
|
true
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
|
|
fn check_invalid_crate_level_attr(tcx: TyCtxt<'_>, attrs: &[Attribute]) {
|
|
const ATTRS_TO_CHECK: &[Symbol] = &[
|
|
sym::macro_export,
|
|
sym::repr,
|
|
sym::path,
|
|
sym::automatically_derived,
|
|
sym::start,
|
|
sym::main,
|
|
];
|
|
|
|
for attr in attrs {
|
|
for attr_to_check in ATTRS_TO_CHECK {
|
|
if tcx.sess.check_name(attr, *attr_to_check) {
|
|
tcx.sess
|
|
.struct_span_err(
|
|
attr.span,
|
|
&format!(
|
|
"`{}` attribute cannot be used at crate level",
|
|
attr_to_check.to_ident_string()
|
|
),
|
|
)
|
|
.emit();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn check_invalid_macro_level_attr(tcx: TyCtxt<'_>, attrs: &[Attribute]) {
|
|
for attr in attrs {
|
|
if tcx.sess.check_name(attr, sym::inline) {
|
|
struct_span_err!(
|
|
tcx.sess,
|
|
attr.span,
|
|
E0518,
|
|
"attribute should be applied to function or closure",
|
|
)
|
|
.span_label(attr.span, "not a function or closure")
|
|
.emit();
|
|
}
|
|
}
|
|
}
|
|
|
|
fn check_mod_attrs(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
|
|
let check_attr_visitor = &mut CheckAttrVisitor { tcx };
|
|
tcx.hir().visit_item_likes_in_module(module_def_id, &mut check_attr_visitor.as_deep_visitor());
|
|
tcx.hir().visit_exported_macros_in_krate(check_attr_visitor);
|
|
check_invalid_macro_level_attr(tcx, tcx.hir().krate().non_exported_macro_attrs);
|
|
if module_def_id.is_top_level_module() {
|
|
check_attr_visitor.check_attributes(
|
|
CRATE_HIR_ID,
|
|
tcx.hir().krate_attrs(),
|
|
&DUMMY_SP,
|
|
Target::Mod,
|
|
None,
|
|
);
|
|
check_invalid_crate_level_attr(tcx, tcx.hir().krate_attrs());
|
|
}
|
|
}
|
|
|
|
pub(crate) fn provide(providers: &mut Providers) {
|
|
*providers = Providers { check_mod_attrs, ..*providers };
|
|
}
|