05cd75504b
Add a trait generalizing over the crate root and freshly loaded modules instead This also makes node IDs used for pre-expansion linting more precise
673 lines
27 KiB
Rust
673 lines
27 KiB
Rust
use crate::context::{CheckLintNameResult, LintStore};
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use crate::late::unerased_lint_store;
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use rustc_ast as ast;
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use rustc_ast_pretty::pprust;
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use rustc_data_structures::fx::FxHashMap;
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use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder};
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use rustc_hir as hir;
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use rustc_hir::{intravisit, HirId};
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use rustc_middle::hir::nested_filter;
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use rustc_middle::lint::LevelAndSource;
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use rustc_middle::lint::LintDiagnosticBuilder;
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use rustc_middle::lint::{
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struct_lint_level, LintLevelMap, LintLevelSets, LintLevelSource, LintSet, LintStackIndex,
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COMMAND_LINE,
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};
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use rustc_middle::ty::query::Providers;
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use rustc_middle::ty::{RegisteredTools, TyCtxt};
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use rustc_session::lint::{
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builtin::{self, FORBIDDEN_LINT_GROUPS},
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Level, Lint, LintId,
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};
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use rustc_session::parse::feature_err;
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use rustc_session::Session;
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use rustc_span::symbol::{sym, Symbol};
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use rustc_span::{source_map::MultiSpan, Span, DUMMY_SP};
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use tracing::debug;
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fn lint_levels(tcx: TyCtxt<'_>, (): ()) -> LintLevelMap {
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let store = unerased_lint_store(tcx);
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let levels =
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LintLevelsBuilder::new(tcx.sess, false, &store, &tcx.resolutions(()).registered_tools);
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let mut builder = LintLevelMapBuilder { levels, tcx };
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let krate = tcx.hir().krate();
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builder.levels.id_to_set.reserve(krate.owners.len() + 1);
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let push = builder.levels.push(tcx.hir().attrs(hir::CRATE_HIR_ID), true);
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builder.levels.register_id(hir::CRATE_HIR_ID);
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tcx.hir().walk_toplevel_module(&mut builder);
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builder.levels.pop(push);
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builder.levels.build_map()
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}
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pub struct LintLevelsBuilder<'s> {
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sess: &'s Session,
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sets: LintLevelSets,
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id_to_set: FxHashMap<HirId, LintStackIndex>,
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cur: LintStackIndex,
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warn_about_weird_lints: bool,
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store: &'s LintStore,
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registered_tools: &'s RegisteredTools,
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}
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pub struct BuilderPush {
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prev: LintStackIndex,
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pub changed: bool,
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}
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impl<'s> LintLevelsBuilder<'s> {
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pub fn new(
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sess: &'s Session,
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warn_about_weird_lints: bool,
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store: &'s LintStore,
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registered_tools: &'s RegisteredTools,
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) -> Self {
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let mut builder = LintLevelsBuilder {
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sess,
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sets: LintLevelSets::new(),
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cur: COMMAND_LINE,
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id_to_set: Default::default(),
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warn_about_weird_lints,
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store,
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registered_tools,
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};
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builder.process_command_line(sess, store);
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assert_eq!(builder.sets.list.len(), 1);
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builder
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}
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pub(crate) fn sess(&self) -> &Session {
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self.sess
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}
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pub(crate) fn lint_store(&self) -> &LintStore {
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self.store
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}
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fn process_command_line(&mut self, sess: &Session, store: &LintStore) {
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let mut specs = FxHashMap::default();
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self.sets.lint_cap = sess.opts.lint_cap.unwrap_or(Level::Forbid);
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for &(ref lint_name, level) in &sess.opts.lint_opts {
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store.check_lint_name_cmdline(sess, &lint_name, level, self.registered_tools);
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let orig_level = level;
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let lint_flag_val = Symbol::intern(lint_name);
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let ids = match store.find_lints(&lint_name) {
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Ok(ids) => ids,
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Err(_) => continue, // errors handled in check_lint_name_cmdline above
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};
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for id in ids {
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// ForceWarn and Forbid cannot be overriden
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if let Some((Level::ForceWarn | Level::Forbid, _)) = specs.get(&id) {
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continue;
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}
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self.check_gated_lint(id, DUMMY_SP);
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let src = LintLevelSource::CommandLine(lint_flag_val, orig_level);
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specs.insert(id, (level, src));
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}
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}
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self.cur = self.sets.list.push(LintSet { specs, parent: COMMAND_LINE });
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}
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/// Attempts to insert the `id` to `level_src` map entry. If unsuccessful
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/// (e.g. if a forbid was already inserted on the same scope), then emits a
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/// diagnostic with no change to `specs`.
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fn insert_spec(
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&mut self,
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specs: &mut FxHashMap<LintId, LevelAndSource>,
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id: LintId,
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(level, src): LevelAndSource,
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) {
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let (old_level, old_src) =
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self.sets.get_lint_level(id.lint, self.cur, Some(&specs), &self.sess);
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// Setting to a non-forbid level is an error if the lint previously had
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// a forbid level. Note that this is not necessarily true even with a
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// `#[forbid(..)]` attribute present, as that is overriden by `--cap-lints`.
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//
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// This means that this only errors if we're truly lowering the lint
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// level from forbid.
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if level != Level::Forbid {
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if let Level::Forbid = old_level {
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// Backwards compatibility check:
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//
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// We used to not consider `forbid(lint_group)`
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// as preventing `allow(lint)` for some lint `lint` in
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// `lint_group`. For now, issue a future-compatibility
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// warning for this case.
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let id_name = id.lint.name_lower();
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let fcw_warning = match old_src {
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LintLevelSource::Default => false,
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LintLevelSource::Node(symbol, _, _) => self.store.is_lint_group(symbol),
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LintLevelSource::CommandLine(symbol, _) => self.store.is_lint_group(symbol),
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};
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debug!(
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"fcw_warning={:?}, specs.get(&id) = {:?}, old_src={:?}, id_name={:?}",
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fcw_warning, specs, old_src, id_name
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);
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let decorate_diag_builder = |mut diag_builder: DiagnosticBuilder<'_>| {
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diag_builder.span_label(src.span(), "overruled by previous forbid");
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match old_src {
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LintLevelSource::Default => {
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diag_builder.note(&format!(
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"`forbid` lint level is the default for {}",
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id.to_string()
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));
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}
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LintLevelSource::Node(_, forbid_source_span, reason) => {
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diag_builder.span_label(forbid_source_span, "`forbid` level set here");
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if let Some(rationale) = reason {
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diag_builder.note(rationale.as_str());
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}
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}
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LintLevelSource::CommandLine(_, _) => {
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diag_builder.note("`forbid` lint level was set on command line");
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}
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}
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diag_builder.emit();
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};
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if !fcw_warning {
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let diag_builder = struct_span_err!(
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self.sess,
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src.span(),
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E0453,
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"{}({}) incompatible with previous forbid",
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level.as_str(),
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src.name(),
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);
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decorate_diag_builder(diag_builder);
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} else {
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self.struct_lint(
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FORBIDDEN_LINT_GROUPS,
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Some(src.span().into()),
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|diag_builder| {
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let diag_builder = diag_builder.build(&format!(
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"{}({}) incompatible with previous forbid",
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level.as_str(),
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src.name(),
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));
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decorate_diag_builder(diag_builder);
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},
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);
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}
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// Retain the forbid lint level, unless we are
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// issuing a FCW. In the FCW case, we want to
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// respect the new setting.
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if !fcw_warning {
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return;
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}
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}
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}
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if let Level::ForceWarn = old_level {
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specs.insert(id, (old_level, old_src));
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} else {
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specs.insert(id, (level, src));
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}
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}
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/// Pushes a list of AST lint attributes onto this context.
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///
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/// This function will return a `BuilderPush` object which should be passed
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/// to `pop` when this scope for the attributes provided is exited.
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///
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/// This function will perform a number of tasks:
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///
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/// * It'll validate all lint-related attributes in `attrs`
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/// * It'll mark all lint-related attributes as used
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/// * Lint levels will be updated based on the attributes provided
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/// * Lint attributes are validated, e.g., a `#[forbid]` can't be switched to
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/// `#[allow]`
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///
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/// Don't forget to call `pop`!
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pub(crate) fn push(&mut self, attrs: &[ast::Attribute], is_crate_node: bool) -> BuilderPush {
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let mut specs = FxHashMap::default();
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let sess = self.sess;
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let bad_attr = |span| struct_span_err!(sess, span, E0452, "malformed lint attribute input");
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for attr in attrs {
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let Some(level) = Level::from_symbol(attr.name_or_empty()) else {
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continue
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};
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let Some(mut metas) = attr.meta_item_list() else {
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continue
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};
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if metas.is_empty() {
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// FIXME (#55112): issue unused-attributes lint for `#[level()]`
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continue;
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}
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// Before processing the lint names, look for a reason (RFC 2383)
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// at the end.
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let mut reason = None;
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let tail_li = &metas[metas.len() - 1];
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if let Some(item) = tail_li.meta_item() {
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match item.kind {
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ast::MetaItemKind::Word => {} // actual lint names handled later
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ast::MetaItemKind::NameValue(ref name_value) => {
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if item.path == sym::reason {
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// FIXME (#55112): issue unused-attributes lint if we thereby
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// don't have any lint names (`#[level(reason = "foo")]`)
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if let ast::LitKind::Str(rationale, _) = name_value.kind {
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if !self.sess.features_untracked().lint_reasons {
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feature_err(
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&self.sess.parse_sess,
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sym::lint_reasons,
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item.span,
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"lint reasons are experimental",
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)
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.emit();
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}
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reason = Some(rationale);
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} else {
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bad_attr(name_value.span)
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.span_label(name_value.span, "reason must be a string literal")
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.emit();
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}
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// found reason, reslice meta list to exclude it
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metas.pop().unwrap();
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} else {
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bad_attr(item.span)
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.span_label(item.span, "bad attribute argument")
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.emit();
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}
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}
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ast::MetaItemKind::List(_) => {
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bad_attr(item.span).span_label(item.span, "bad attribute argument").emit();
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}
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}
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}
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for li in metas {
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let sp = li.span();
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let mut meta_item = match li {
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ast::NestedMetaItem::MetaItem(meta_item) if meta_item.is_word() => meta_item,
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_ => {
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let mut err = bad_attr(sp);
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let mut add_label = true;
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if let Some(item) = li.meta_item() {
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if let ast::MetaItemKind::NameValue(_) = item.kind {
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if item.path == sym::reason {
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err.span_label(sp, "reason in lint attribute must come last");
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add_label = false;
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}
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}
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}
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if add_label {
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err.span_label(sp, "bad attribute argument");
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}
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err.emit();
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continue;
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}
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};
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let tool_ident = if meta_item.path.segments.len() > 1 {
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Some(meta_item.path.segments.remove(0).ident)
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} else {
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None
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};
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let tool_name = tool_ident.map(|ident| ident.name);
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let name = pprust::path_to_string(&meta_item.path);
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let lint_result =
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self.store.check_lint_name(&name, tool_name, self.registered_tools);
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match &lint_result {
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CheckLintNameResult::Ok(ids) => {
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let src = LintLevelSource::Node(
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meta_item.path.segments.last().expect("empty lint name").ident.name,
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sp,
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reason,
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);
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for &id in *ids {
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self.check_gated_lint(id, attr.span);
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self.insert_spec(&mut specs, id, (level, src));
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}
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}
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CheckLintNameResult::Tool(result) => {
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match *result {
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Ok(ids) => {
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let complete_name =
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&format!("{}::{}", tool_ident.unwrap().name, name);
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let src = LintLevelSource::Node(
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Symbol::intern(complete_name),
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sp,
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reason,
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);
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for id in ids {
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self.insert_spec(&mut specs, *id, (level, src));
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}
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}
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Err((Some(ids), ref new_lint_name)) => {
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let lint = builtin::RENAMED_AND_REMOVED_LINTS;
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let (lvl, src) =
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self.sets.get_lint_level(lint, self.cur, Some(&specs), &sess);
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struct_lint_level(
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self.sess,
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lint,
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lvl,
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src,
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Some(sp.into()),
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|lint| {
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let msg = format!(
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"lint name `{}` is deprecated \
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and may not have an effect in the future.",
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name
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);
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lint.build(&msg)
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.span_suggestion(
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sp,
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"change it to",
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new_lint_name.to_string(),
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Applicability::MachineApplicable,
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)
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.emit();
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},
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);
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let src = LintLevelSource::Node(
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Symbol::intern(&new_lint_name),
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sp,
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reason,
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);
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for id in ids {
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self.insert_spec(&mut specs, *id, (level, src));
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}
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}
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Err((None, _)) => {
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// If Tool(Err(None, _)) is returned, then either the lint does not
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// exist in the tool or the code was not compiled with the tool and
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// therefore the lint was never added to the `LintStore`. To detect
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// this is the responsibility of the lint tool.
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}
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}
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}
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&CheckLintNameResult::NoTool => {
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let mut err = struct_span_err!(
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sess,
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tool_ident.map_or(DUMMY_SP, |ident| ident.span),
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E0710,
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"unknown tool name `{}` found in scoped lint: `{}::{}`",
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tool_name.unwrap(),
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tool_name.unwrap(),
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pprust::path_to_string(&meta_item.path),
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);
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if sess.is_nightly_build() {
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err.help(&format!(
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"add `#![register_tool({})]` to the crate root",
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tool_name.unwrap()
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));
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}
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err.emit();
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continue;
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}
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_ if !self.warn_about_weird_lints => {}
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CheckLintNameResult::Warning(msg, renamed) => {
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let lint = builtin::RENAMED_AND_REMOVED_LINTS;
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let (renamed_lint_level, src) =
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self.sets.get_lint_level(lint, self.cur, Some(&specs), &sess);
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struct_lint_level(
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self.sess,
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lint,
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renamed_lint_level,
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src,
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Some(sp.into()),
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|lint| {
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let mut err = lint.build(&msg);
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if let Some(new_name) = &renamed {
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err.span_suggestion(
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sp,
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"use the new name",
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new_name.to_string(),
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Applicability::MachineApplicable,
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);
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}
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err.emit();
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},
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);
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}
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CheckLintNameResult::NoLint(suggestion) => {
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let lint = builtin::UNKNOWN_LINTS;
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let (level, src) =
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self.sets.get_lint_level(lint, self.cur, Some(&specs), self.sess);
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struct_lint_level(self.sess, lint, level, src, Some(sp.into()), |lint| {
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let name = if let Some(tool_ident) = tool_ident {
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format!("{}::{}", tool_ident.name, name)
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} else {
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name.to_string()
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};
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let mut db = lint.build(&format!("unknown lint: `{}`", name));
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if let Some(suggestion) = suggestion {
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db.span_suggestion(
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sp,
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"did you mean",
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suggestion.to_string(),
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Applicability::MachineApplicable,
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);
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}
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db.emit();
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});
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}
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}
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// If this lint was renamed, apply the new lint instead of ignoring the attribute.
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// This happens outside of the match because the new lint should be applied even if
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// we don't warn about the name change.
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if let CheckLintNameResult::Warning(_, Some(new_name)) = lint_result {
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// Ignore any errors or warnings that happen because the new name is inaccurate
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// NOTE: `new_name` already includes the tool name, so we don't have to add it again.
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if let CheckLintNameResult::Ok(ids) =
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self.store.check_lint_name(&new_name, None, self.registered_tools)
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{
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let src = LintLevelSource::Node(Symbol::intern(&new_name), sp, reason);
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for &id in ids {
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self.check_gated_lint(id, attr.span);
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self.insert_spec(&mut specs, id, (level, src));
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}
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} else {
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panic!("renamed lint does not exist: {}", new_name);
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}
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}
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}
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}
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|
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if !is_crate_node {
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for (id, &(level, ref src)) in specs.iter() {
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if !id.lint.crate_level_only {
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continue;
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}
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let LintLevelSource::Node(lint_attr_name, lint_attr_span, _) = *src else {
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continue
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};
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let lint = builtin::UNUSED_ATTRIBUTES;
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let (lint_level, lint_src) =
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self.sets.get_lint_level(lint, self.cur, Some(&specs), self.sess);
|
|
struct_lint_level(
|
|
self.sess,
|
|
lint,
|
|
lint_level,
|
|
lint_src,
|
|
Some(lint_attr_span.into()),
|
|
|lint| {
|
|
let mut db = lint.build(&format!(
|
|
"{}({}) is ignored unless specified at crate level",
|
|
level.as_str(),
|
|
lint_attr_name
|
|
));
|
|
db.emit();
|
|
},
|
|
);
|
|
// don't set a separate error for every lint in the group
|
|
break;
|
|
}
|
|
}
|
|
|
|
let prev = self.cur;
|
|
if !specs.is_empty() {
|
|
self.cur = self.sets.list.push(LintSet { specs, parent: prev });
|
|
}
|
|
|
|
BuilderPush { prev, changed: prev != self.cur }
|
|
}
|
|
|
|
/// Checks if the lint is gated on a feature that is not enabled.
|
|
fn check_gated_lint(&self, lint_id: LintId, span: Span) {
|
|
if let Some(feature) = lint_id.lint.feature_gate {
|
|
if !self.sess.features_untracked().enabled(feature) {
|
|
feature_err(
|
|
&self.sess.parse_sess,
|
|
feature,
|
|
span,
|
|
&format!("the `{}` lint is unstable", lint_id.lint.name_lower()),
|
|
)
|
|
.emit();
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Called after `push` when the scope of a set of attributes are exited.
|
|
pub fn pop(&mut self, push: BuilderPush) {
|
|
self.cur = push.prev;
|
|
}
|
|
|
|
/// Find the lint level for a lint.
|
|
pub fn lint_level(&self, lint: &'static Lint) -> (Level, LintLevelSource) {
|
|
self.sets.get_lint_level(lint, self.cur, None, self.sess)
|
|
}
|
|
|
|
/// Used to emit a lint-related diagnostic based on the current state of
|
|
/// this lint context.
|
|
pub fn struct_lint(
|
|
&self,
|
|
lint: &'static Lint,
|
|
span: Option<MultiSpan>,
|
|
decorate: impl for<'a> FnOnce(LintDiagnosticBuilder<'a>),
|
|
) {
|
|
let (level, src) = self.lint_level(lint);
|
|
struct_lint_level(self.sess, lint, level, src, span, decorate)
|
|
}
|
|
|
|
/// Registers the ID provided with the current set of lints stored in
|
|
/// this context.
|
|
pub fn register_id(&mut self, id: HirId) {
|
|
self.id_to_set.insert(id, self.cur);
|
|
}
|
|
|
|
pub fn build_map(self) -> LintLevelMap {
|
|
LintLevelMap { sets: self.sets, id_to_set: self.id_to_set }
|
|
}
|
|
}
|
|
|
|
struct LintLevelMapBuilder<'tcx> {
|
|
levels: LintLevelsBuilder<'tcx>,
|
|
tcx: TyCtxt<'tcx>,
|
|
}
|
|
|
|
impl LintLevelMapBuilder<'_> {
|
|
fn with_lint_attrs<F>(&mut self, id: hir::HirId, f: F)
|
|
where
|
|
F: FnOnce(&mut Self),
|
|
{
|
|
let is_crate_hir = id == hir::CRATE_HIR_ID;
|
|
let attrs = self.tcx.hir().attrs(id);
|
|
let push = self.levels.push(attrs, is_crate_hir);
|
|
if push.changed {
|
|
self.levels.register_id(id);
|
|
}
|
|
f(self);
|
|
self.levels.pop(push);
|
|
}
|
|
}
|
|
|
|
impl<'tcx> intravisit::Visitor<'tcx> for LintLevelMapBuilder<'tcx> {
|
|
type NestedFilter = nested_filter::All;
|
|
|
|
fn nested_visit_map(&mut self) -> Self::Map {
|
|
self.tcx.hir()
|
|
}
|
|
|
|
fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) {
|
|
self.with_lint_attrs(param.hir_id, |builder| {
|
|
intravisit::walk_param(builder, param);
|
|
});
|
|
}
|
|
|
|
fn visit_item(&mut self, it: &'tcx hir::Item<'tcx>) {
|
|
self.with_lint_attrs(it.hir_id(), |builder| {
|
|
intravisit::walk_item(builder, it);
|
|
});
|
|
}
|
|
|
|
fn visit_foreign_item(&mut self, it: &'tcx hir::ForeignItem<'tcx>) {
|
|
self.with_lint_attrs(it.hir_id(), |builder| {
|
|
intravisit::walk_foreign_item(builder, it);
|
|
})
|
|
}
|
|
|
|
fn visit_stmt(&mut self, e: &'tcx hir::Stmt<'tcx>) {
|
|
// We will call `with_lint_attrs` when we walk
|
|
// the `StmtKind`. The outer statement itself doesn't
|
|
// define the lint levels.
|
|
intravisit::walk_stmt(self, e);
|
|
}
|
|
|
|
fn visit_expr(&mut self, e: &'tcx hir::Expr<'tcx>) {
|
|
self.with_lint_attrs(e.hir_id, |builder| {
|
|
intravisit::walk_expr(builder, e);
|
|
})
|
|
}
|
|
|
|
fn visit_field_def(&mut self, s: &'tcx hir::FieldDef<'tcx>) {
|
|
self.with_lint_attrs(s.hir_id, |builder| {
|
|
intravisit::walk_field_def(builder, s);
|
|
})
|
|
}
|
|
|
|
fn visit_variant(
|
|
&mut self,
|
|
v: &'tcx hir::Variant<'tcx>,
|
|
g: &'tcx hir::Generics<'tcx>,
|
|
item_id: hir::HirId,
|
|
) {
|
|
self.with_lint_attrs(v.id, |builder| {
|
|
intravisit::walk_variant(builder, v, g, item_id);
|
|
})
|
|
}
|
|
|
|
fn visit_local(&mut self, l: &'tcx hir::Local<'tcx>) {
|
|
self.with_lint_attrs(l.hir_id, |builder| {
|
|
intravisit::walk_local(builder, l);
|
|
})
|
|
}
|
|
|
|
fn visit_arm(&mut self, a: &'tcx hir::Arm<'tcx>) {
|
|
self.with_lint_attrs(a.hir_id, |builder| {
|
|
intravisit::walk_arm(builder, a);
|
|
})
|
|
}
|
|
|
|
fn visit_trait_item(&mut self, trait_item: &'tcx hir::TraitItem<'tcx>) {
|
|
self.with_lint_attrs(trait_item.hir_id(), |builder| {
|
|
intravisit::walk_trait_item(builder, trait_item);
|
|
});
|
|
}
|
|
|
|
fn visit_impl_item(&mut self, impl_item: &'tcx hir::ImplItem<'tcx>) {
|
|
self.with_lint_attrs(impl_item.hir_id(), |builder| {
|
|
intravisit::walk_impl_item(builder, impl_item);
|
|
});
|
|
}
|
|
}
|
|
|
|
pub fn provide(providers: &mut Providers) {
|
|
providers.lint_levels = lint_levels;
|
|
}
|