Move some code and add comments.
This commit is contained in:
Camille GILLOT
parent
bd45139cb0
commit
ad09abc194
6 changed files with 195 additions and 255 deletions
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@ -1,14 +1,11 @@
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use std::cmp;
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use rustc_data_structures::fx::FxHashMap;
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use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
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use rustc_errors::{Diagnostic, DiagnosticId, LintDiagnosticBuilder, MultiSpan};
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use rustc_hir::HirId;
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use rustc_index::vec::IndexVec;
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use rustc_query_system::ich::StableHashingContext;
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use rustc_session::lint::{
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builtin::{self, FORBIDDEN_LINT_GROUPS},
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FutureIncompatibilityReason, Level, Lint, LintExpectationId, LintId,
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FutureIncompatibilityReason, Level, Lint, LintId,
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};
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use rustc_session::Session;
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use rustc_span::hygiene::MacroKind;
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@ -61,212 +58,118 @@ impl LintLevelSource {
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/// A tuple of a lint level and its source.
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pub type LevelAndSource = (Level, LintLevelSource);
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#[derive(Debug, HashStable)]
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pub struct LintLevelSets {
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pub list: IndexVec<LintStackIndex, LintSet>,
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}
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rustc_index::newtype_index! {
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#[derive(HashStable)]
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pub struct LintStackIndex {
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const COMMAND_LINE = 0,
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}
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}
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#[derive(Debug, HashStable)]
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pub struct LintSet {
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// -A,-W,-D flags, a `Symbol` for the flag itself and `Level` for which
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// flag.
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/// Return type for the `shallow_lint_levels_on` query.
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///
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/// This map represents the set of allowed lints and allowance levels given
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/// by the attributes for *a single HirId*.
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#[derive(Default, Debug, HashStable)]
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pub struct ShallowLintLevelMap {
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pub specs: FxHashMap<LintId, LevelAndSource>,
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pub parent: LintStackIndex,
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}
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impl LintLevelSets {
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pub fn new() -> Self {
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LintLevelSets { list: IndexVec::new() }
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}
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/// From an initial level and source, verify the effect of special annotations:
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/// `warnings` lint level and lint caps.
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///
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/// The return of this function is suitable for diagnostics.
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pub fn reveal_actual_level(
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level: Option<Level>,
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src: &mut LintLevelSource,
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sess: &Session,
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lint: LintId,
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probe_for_lint_level: impl FnOnce(LintId) -> (Option<Level>, LintLevelSource),
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) -> Level {
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// If `level` is none then we actually assume the default level for this lint.
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let mut level = level.unwrap_or_else(|| lint.lint.default_level(sess.edition()));
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pub fn actual_level(
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level: Option<Level>,
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src: &mut LintLevelSource,
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sess: &Session,
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lint: &'static Lint,
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get_lint_id_level: impl FnOnce(LintId) -> (Option<Level>, LintLevelSource),
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) -> Level {
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// If `level` is none then we actually assume the default level for this
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// lint.
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let mut level = level.unwrap_or_else(|| lint.default_level(sess.edition()));
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// If we're about to issue a warning, check at the last minute for any
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// directives against the warnings "lint". If, for example, there's an
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// `allow(warnings)` in scope then we want to respect that instead.
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//
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// We exempt `FORBIDDEN_LINT_GROUPS` from this because it specifically
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// triggers in cases (like #80988) where you have `forbid(warnings)`,
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// and so if we turned that into an error, it'd defeat the purpose of the
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// future compatibility warning.
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if level == Level::Warn && LintId::of(lint) != LintId::of(FORBIDDEN_LINT_GROUPS) {
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let (warnings_level, warnings_src) = get_lint_id_level(LintId::of(builtin::WARNINGS));
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if let Some(configured_warning_level) = warnings_level {
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if configured_warning_level != Level::Warn {
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level = configured_warning_level;
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*src = warnings_src;
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}
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// If we're about to issue a warning, check at the last minute for any
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// directives against the warnings "lint". If, for example, there's an
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// `allow(warnings)` in scope then we want to respect that instead.
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//
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// We exempt `FORBIDDEN_LINT_GROUPS` from this because it specifically
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// triggers in cases (like #80988) where you have `forbid(warnings)`,
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// and so if we turned that into an error, it'd defeat the purpose of the
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// future compatibility warning.
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if level == Level::Warn && lint != LintId::of(FORBIDDEN_LINT_GROUPS) {
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let (warnings_level, warnings_src) = probe_for_lint_level(LintId::of(builtin::WARNINGS));
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if let Some(configured_warning_level) = warnings_level {
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if configured_warning_level != Level::Warn {
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level = configured_warning_level;
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*src = warnings_src;
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}
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}
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}
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// Ensure that we never exceed the `--cap-lints` argument
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// unless the source is a --force-warn
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level = if let LintLevelSource::CommandLine(_, Level::ForceWarn(_)) = src {
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level
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} else {
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cmp::min(level, sess.opts.lint_cap.unwrap_or(Level::Forbid))
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};
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if let Some(driver_level) = sess.driver_lint_caps.get(&LintId::of(lint)) {
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// Ensure that we never exceed driver level.
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level = cmp::min(*driver_level, level);
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}
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// Ensure that we never exceed the `--cap-lints` argument unless the source is a --force-warn
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level = if let LintLevelSource::CommandLine(_, Level::ForceWarn(_)) = src {
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level
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} else {
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cmp::min(level, sess.opts.lint_cap.unwrap_or(Level::Forbid))
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};
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if let Some(driver_level) = sess.driver_lint_caps.get(&lint) {
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// Ensure that we never exceed driver level.
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level = cmp::min(*driver_level, level);
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}
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pub fn get_lint_level(
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&self,
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lint: &'static Lint,
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idx: LintStackIndex,
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aux: Option<&FxHashMap<LintId, LevelAndSource>>,
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sess: &Session,
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) -> LevelAndSource {
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let (level, mut src) = self.get_lint_id_level(LintId::of(lint), idx, aux);
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let level = Self::actual_level(level, &mut src, sess, lint, |id| {
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self.get_lint_id_level(id, idx, aux)
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});
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(level, src)
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}
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pub fn get_lint_id_level(
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level
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}
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impl ShallowLintLevelMap {
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/// Perform a deep probe in the HIR tree looking for the actual level for the lint.
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/// This lint level is not usable for diagnostics, it needs to be corrected by
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/// `reveal_actual_level` beforehand.
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fn probe_for_lint_level(
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&self,
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tcx: TyCtxt<'_>,
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id: LintId,
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mut idx: LintStackIndex,
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aux: Option<&FxHashMap<LintId, LevelAndSource>>,
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start: HirId,
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) -> (Option<Level>, LintLevelSource) {
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if let Some(specs) = aux {
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if let Some(&(level, src)) = specs.get(&id) {
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return (Some(level), src);
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}
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}
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loop {
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let LintSet { ref specs, parent } = self.list[idx];
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if let Some(&(level, src)) = specs.get(&id) {
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return (Some(level), src);
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}
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if idx == COMMAND_LINE {
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return (None, LintLevelSource::Default);
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}
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idx = parent;
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}
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}
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}
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#[derive(Debug)]
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pub struct LintLevelMap {
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/// This is a collection of lint expectations as described in RFC 2383, that
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/// can be fulfilled during this compilation session. This means that at least
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/// one expected lint is currently registered in the lint store.
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///
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/// The [`LintExpectationId`] is stored as a part of the [`Expect`](Level::Expect)
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/// lint level.
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pub lint_expectations: Vec<(LintExpectationId, LintExpectation)>,
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pub sets: LintLevelSets,
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pub id_to_set: FxHashMap<HirId, LintStackIndex>,
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}
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impl LintLevelMap {
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/// If the `id` was previously registered with `register_id` when building
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/// this `LintLevelMap` this returns the corresponding lint level and source
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/// of the lint level for the lint provided.
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///
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/// If the `id` was not previously registered, returns `None`. If `None` is
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/// returned then the parent of `id` should be acquired and this function
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/// should be called again.
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pub fn level_and_source(
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&self,
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lint: &'static Lint,
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id: HirId,
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session: &Session,
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) -> Option<LevelAndSource> {
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self.id_to_set.get(&id).map(|idx| self.sets.get_lint_level(lint, *idx, None, session))
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}
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}
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impl<'a> HashStable<StableHashingContext<'a>> for LintLevelMap {
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#[inline]
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fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
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let LintLevelMap { ref sets, ref id_to_set, ref lint_expectations } = *self;
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id_to_set.hash_stable(hcx, hasher);
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lint_expectations.hash_stable(hcx, hasher);
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hcx.while_hashing_spans(true, |hcx| sets.hash_stable(hcx, hasher))
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}
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}
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pub struct LintLevelQueryMap<'tcx> {
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pub tcx: TyCtxt<'tcx>,
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pub cur: HirId,
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pub specs: FxHashMap<LintId, LevelAndSource>,
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}
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impl<'tcx> LintLevelQueryMap<'tcx> {
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pub fn lint_id_level(&self, id: LintId) -> (Option<Level>, LintLevelSource) {
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Self::get_lint_id_level(id, self.cur, self.tcx, &self.specs)
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}
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pub fn lint_level(&self, lint: &'static Lint) -> LevelAndSource {
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Self::get_lint_level(LintId::of(lint), self.cur, self.tcx, &self.specs)
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}
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pub fn get_lint_id_level(
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id: LintId,
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cur: HirId,
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tcx: TyCtxt<'tcx>,
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specs: &FxHashMap<LintId, LevelAndSource>,
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) -> (Option<Level>, LintLevelSource) {
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if let Some(&(level, src)) = specs.get(&id) {
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if let Some(&(level, src)) = self.specs.get(&id) {
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return (Some(level), src);
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}
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let mut cur = cur;
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loop {
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let parent = tcx.hir().get_parent_node(cur);
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if cur == parent {
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return (None, LintLevelSource::Default);
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}
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let specs = tcx.lint_levels_on(parent);
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if let Some(&(level, src)) = specs.get(&id) {
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for (parent, _) in tcx.hir().parent_iter(start) {
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let specs = tcx.shallow_lint_levels_on(parent);
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if let Some(&(level, src)) = specs.specs.get(&id) {
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return (Some(level), src);
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}
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cur = parent
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}
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(None, LintLevelSource::Default)
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}
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pub fn get_lint_level(
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id: LintId,
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cur: HirId,
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tcx: TyCtxt<'tcx>,
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specs: &FxHashMap<LintId, LevelAndSource>,
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/// Fetch and return the user-visible lint level for the given lint at the given HirId.
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pub fn lint_level_id_at_node(
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&self,
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tcx: TyCtxt<'_>,
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lint: LintId,
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id: HirId,
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) -> (Level, LintLevelSource) {
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let (level, mut src) = Self::get_lint_id_level(id, cur, tcx, specs);
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let level = LintLevelSets::actual_level(level, &mut src, tcx.sess, id.lint, |id| {
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Self::get_lint_id_level(id, cur, tcx, specs)
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let (level, mut src) = self.probe_for_lint_level(tcx, lint, id);
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let level = reveal_actual_level(level, &mut src, tcx.sess, lint, |lint| {
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self.probe_for_lint_level(tcx, lint, id)
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});
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debug!(?id, ?level, ?src);
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(level, src)
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}
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}
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impl TyCtxt<'_> {
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/// Fetch and return the user-visible lint level for the given lint at the given HirId.
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pub fn lint_level_at_node(self, lint: &'static Lint, id: HirId) -> (Level, LintLevelSource) {
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self.shallow_lint_levels_on(id).lint_level_id_at_node(self, LintId::of(lint), id)
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}
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/// Walks upwards from `id` to find a node which might change lint levels with attributes.
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/// It stops at `bound` and just returns it if reached.
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pub fn maybe_lint_level_root_bounded(self, mut id: HirId, bound: HirId) -> HirId {
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let hir = self.hir();
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while id != bound && self.shallow_lint_levels_on(id).specs.is_empty() {
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id = hir.get_parent_node(id)
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}
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id
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}
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}
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/// This struct represents a lint expectation and holds all required information
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/// to emit the `unfulfilled_lint_expectations` lint if it is unfulfilled after
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/// the `LateLintPass` has completed.
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