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Revert "Auto merge of #101620 - cjgillot:compute_lint_levels_by_def, r=oli-obk"

Browse source 
This reverts commit 2cb9a65684, reversing
changes made to 750bd1a7ff.
This commit is contained in:
Camille GILLOT 2022-09-20 20:04:35 +02:00
parent 381bd2a836
commit fc43df0333
18 changed files with 497 additions and 679 deletions
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2
compiler/rustc_lint/src/context.rs
View file

@ -560,7 +560,7 @@ pub struct LateContext<'tcx> {
/// Context for lint checking of the AST, after expansion, before lowering to HIR.
pub struct EarlyContext<'a> {
pub builder: LintLevelsBuilder<'a, crate::levels::TopDown>,
pub builder: LintLevelsBuilder<'a>,
pub buffered: LintBuffer,
}

1
compiler/rustc_lint/src/early.rs
View file

@ -59,7 +59,6 @@ impl<'a, T: EarlyLintPass> EarlyContextAndPass<'a, T> {
F: FnOnce(&mut Self),
{
let is_crate_node = id == ast::CRATE_NODE_ID;
debug!(?id);
let push = self.context.builder.push(attrs, is_crate_node, None);
self.check_id(id);

4
compiler/rustc_lint/src/expect.rs
View file

@ -16,10 +16,8 @@ fn check_expectations(tcx: TyCtxt<'_>, tool_filter: Option<Symbol>) {
return;
}
let lint_expectations = tcx.lint_expectations(());
let fulfilled_expectations = tcx.sess.diagnostic().steal_fulfilled_expectation_ids();
tracing::debug!(?lint_expectations, ?fulfilled_expectations);
let lint_expectations = &tcx.lint_levels(()).lint_expectations;
for (id, expectation) in lint_expectations {
// This check will always be true, since `lint_expectations` only

682
compiler/rustc_lint/src/levels.rs
View file

@ -6,11 +6,10 @@ use rustc_data_structures::fx::FxHashMap;
use rustc_errors::{Applicability, Diagnostic, LintDiagnosticBuilder, MultiSpan};
use rustc_hir as hir;
use rustc_hir::{intravisit, HirId};
use rustc_index::vec::IndexVec;
use rustc_middle::hir::nested_filter;
use rustc_middle::lint::{
reveal_actual_level, struct_lint_level, LevelAndSource, LintExpectation, LintLevelSource,
ShallowLintLevelMap,
struct_lint_level, LevelAndSource, LintExpectation, LintLevelMap, LintLevelSets,
LintLevelSource, LintSet, LintStackIndex, COMMAND_LINE,
};
use rustc_middle::ty::query::Providers;
use rustc_middle::ty::{RegisteredTools, TyCtxt};
@ -28,292 +27,47 @@ use crate::errors::{
UnknownToolInScopedLint,
};
/// Collection of lint levels for the whole crate.
/// This is used by AST-based lints, which do not
/// wait until we have built HIR to be emitted.
#[derive(Debug)]
struct LintLevelSets {
/// Linked list of specifications.
list: IndexVec<LintStackIndex, LintSet>,
}
rustc_index::newtype_index! {
struct LintStackIndex {
ENCODABLE = custom, // we don't need encoding
const COMMAND_LINE = 0,
}
}
/// Specifications found at this position in the stack. This map only represents the lints
/// found for one set of attributes (like `shallow_lint_levels_on` does).
///
/// We store the level specifications as a linked list.
/// Each `LintSet` represents a set of attributes on the same AST node.
/// The `parent` forms a linked list that matches the AST tree.
/// This way, walking the linked list is equivalent to walking the AST bottom-up
/// to find the specifications for a given lint.
#[derive(Debug)]
struct LintSet {
// -A,-W,-D flags, a `Symbol` for the flag itself and `Level` for which
// flag.
specs: FxHashMap<LintId, LevelAndSource>,
parent: LintStackIndex,
}
impl LintLevelSets {
fn new() -> Self {
LintLevelSets { list: IndexVec::new() }
}
fn get_lint_level(
&self,
lint: &'static Lint,
idx: LintStackIndex,
aux: Option<&FxHashMap<LintId, LevelAndSource>>,
sess: &Session,
) -> LevelAndSource {
let lint = LintId::of(lint);
let (level, mut src) = self.raw_lint_id_level(lint, idx, aux);
let level = reveal_actual_level(level, &mut src, sess, lint, |id| {
self.raw_lint_id_level(id, idx, aux)
});
(level, src)
}
fn raw_lint_id_level(
&self,
id: LintId,
mut idx: LintStackIndex,
aux: Option<&FxHashMap<LintId, LevelAndSource>>,
) -> (Option<Level>, LintLevelSource) {
if let Some(specs) = aux {
if let Some(&(level, src)) = specs.get(&id) {
return (Some(level), src);
}
}
loop {
let LintSet { ref specs, parent } = self.list[idx];
if let Some(&(level, src)) = specs.get(&id) {
return (Some(level), src);
}
if idx == COMMAND_LINE {
return (None, LintLevelSource::Default);
}
idx = parent;
}
}
}
fn lint_expectations(tcx: TyCtxt<'_>, (): ()) -> Vec<(LintExpectationId, LintExpectation)> {
fn lint_levels(tcx: TyCtxt<'_>, (): ()) -> LintLevelMap {
let store = unerased_lint_store(tcx);
let levels =
LintLevelsBuilder::new(tcx.sess, false, &store, &tcx.resolutions(()).registered_tools);
let mut builder = LintLevelMapBuilder { levels, tcx };
let krate = tcx.hir().krate();
let mut builder = LintLevelsBuilder {
sess: tcx.sess,
provider: QueryMapExpectationsWrapper {
tcx,
cur: hir::CRATE_HIR_ID,
specs: ShallowLintLevelMap::default(),
expectations: Vec::new(),
unstable_to_stable_ids: FxHashMap::default(),
},
warn_about_weird_lints: false,
store,
registered_tools: &tcx.resolutions(()).registered_tools,
};
builder.levels.id_to_set.reserve(krate.owners.len() + 1);
builder.add_command_line();
builder.add_id(hir::CRATE_HIR_ID);
let push =
builder.levels.push(tcx.hir().attrs(hir::CRATE_HIR_ID), true, Some(hir::CRATE_HIR_ID));
builder.levels.register_id(hir::CRATE_HIR_ID);
tcx.hir().walk_toplevel_module(&mut builder);
builder.levels.pop(push);
tcx.sess.diagnostic().update_unstable_expectation_id(&builder.provider.unstable_to_stable_ids);
builder.provider.expectations
builder.levels.update_unstable_expectation_ids();
builder.levels.build_map()
}
fn shallow_lint_levels_on(tcx: TyCtxt<'_>, hir_id: HirId) -> ShallowLintLevelMap {
let store = unerased_lint_store(tcx);
let mut levels = LintLevelsBuilder {
sess: tcx.sess,
provider: LintLevelQueryMap { tcx, cur: hir_id, specs: ShallowLintLevelMap::default() },
warn_about_weird_lints: false,
store,
registered_tools: &tcx.resolutions(()).registered_tools,
};
let is_crate = hir::CRATE_HIR_ID == hir_id;
if is_crate {
levels.add_command_line();
}
debug!(?hir_id);
levels.add(tcx.hir().attrs(hir_id), is_crate, Some(hir_id));
levels.provider.specs
}
pub struct TopDown {
sets: LintLevelSets,
cur: LintStackIndex,
}
pub trait LintLevelsProvider {
fn current_specs(&self) -> &FxHashMap<LintId, LevelAndSource>;
fn current_specs_mut(&mut self) -> &mut FxHashMap<LintId, LevelAndSource>;
fn get_lint_level(&self, lint: &'static Lint, sess: &Session) -> LevelAndSource;
fn push_expectation(&mut self, _id: LintExpectationId, _expectation: LintExpectation) {}
}
impl LintLevelsProvider for TopDown {
fn current_specs(&self) -> &FxHashMap<LintId, LevelAndSource> {
&self.sets.list[self.cur].specs
}
fn current_specs_mut(&mut self) -> &mut FxHashMap<LintId, LevelAndSource> {
&mut self.sets.list[self.cur].specs
}
fn get_lint_level(&self, lint: &'static Lint, sess: &Session) -> LevelAndSource {
self.sets.get_lint_level(lint, self.cur, Some(self.current_specs()), sess)
}
}
struct LintLevelQueryMap<'tcx> {
tcx: TyCtxt<'tcx>,
cur: HirId,
specs: ShallowLintLevelMap,
}
impl LintLevelsProvider for LintLevelQueryMap<'_> {
fn current_specs(&self) -> &FxHashMap<LintId, LevelAndSource> {
&self.specs.specs
}
fn current_specs_mut(&mut self) -> &mut FxHashMap<LintId, LevelAndSource> {
&mut self.specs.specs
}
fn get_lint_level(&self, lint: &'static Lint, _: &Session) -> LevelAndSource {
self.specs.lint_level_id_at_node(self.tcx, LintId::of(lint), self.cur)
}
}
struct QueryMapExpectationsWrapper<'tcx> {
tcx: TyCtxt<'tcx>,
cur: HirId,
specs: ShallowLintLevelMap,
expectations: Vec<(LintExpectationId, LintExpectation)>,
unstable_to_stable_ids: FxHashMap<LintExpectationId, LintExpectationId>,
}
impl LintLevelsProvider for QueryMapExpectationsWrapper<'_> {
fn current_specs(&self) -> &FxHashMap<LintId, LevelAndSource> {
&self.specs.specs
}
fn current_specs_mut(&mut self) -> &mut FxHashMap<LintId, LevelAndSource> {
self.specs.specs.clear();
&mut self.specs.specs
}
fn get_lint_level(&self, lint: &'static Lint, _: &Session) -> LevelAndSource {
self.specs.lint_level_id_at_node(self.tcx, LintId::of(lint), self.cur)
}
fn push_expectation(&mut self, id: LintExpectationId, expectation: LintExpectation) {
let LintExpectationId::Stable { attr_id: Some(attr_id), hir_id, attr_index, .. } = id else { bug!("unstable expectation id should already be mapped") };
let key = LintExpectationId::Unstable { attr_id, lint_index: None };
if !self.unstable_to_stable_ids.contains_key(&key) {
self.unstable_to_stable_ids.insert(
key,
LintExpectationId::Stable { hir_id, attr_index, lint_index: None, attr_id: None },
);
}
self.expectations.push((id.normalize(), expectation));
}
}
impl<'tcx> LintLevelsBuilder<'_, QueryMapExpectationsWrapper<'tcx>> {
fn add_id(&mut self, hir_id: HirId) {
self.add(self.provider.tcx.hir().attrs(hir_id), hir_id == hir::CRATE_HIR_ID, Some(hir_id));
}
}
impl<'tcx> intravisit::Visitor<'tcx> for LintLevelsBuilder<'_, QueryMapExpectationsWrapper<'tcx>> {
type NestedFilter = nested_filter::All;
fn nested_visit_map(&mut self) -> Self::Map {
self.provider.tcx.hir()
}
fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) {
self.add_id(param.hir_id);
intravisit::walk_param(self, param);
}
fn visit_item(&mut self, it: &'tcx hir::Item<'tcx>) {
self.add_id(it.hir_id());
intravisit::walk_item(self, it);
}
fn visit_foreign_item(&mut self, it: &'tcx hir::ForeignItem<'tcx>) {
self.add_id(it.hir_id());
intravisit::walk_foreign_item(self, it);
}
fn visit_stmt(&mut self, e: &'tcx hir::Stmt<'tcx>) {
// We will call `add_id` 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.add_id(e.hir_id);
intravisit::walk_expr(self, e);
}
fn visit_field_def(&mut self, s: &'tcx hir::FieldDef<'tcx>) {
self.add_id(s.hir_id);
intravisit::walk_field_def(self, s);
}
fn visit_variant(&mut self, v: &'tcx hir::Variant<'tcx>) {
self.add_id(v.id);
intravisit::walk_variant(self, v);
}
fn visit_local(&mut self, l: &'tcx hir::Local<'tcx>) {
self.add_id(l.hir_id);
intravisit::walk_local(self, l);
}
fn visit_arm(&mut self, a: &'tcx hir::Arm<'tcx>) {
self.add_id(a.hir_id);
intravisit::walk_arm(self, a);
}
fn visit_trait_item(&mut self, trait_item: &'tcx hir::TraitItem<'tcx>) {
self.add_id(trait_item.hir_id());
intravisit::walk_trait_item(self, trait_item);
}
fn visit_impl_item(&mut self, impl_item: &'tcx hir::ImplItem<'tcx>) {
self.add_id(impl_item.hir_id());
intravisit::walk_impl_item(self, impl_item);
}
}
pub struct LintLevelsBuilder<'s, P> {
pub struct LintLevelsBuilder<'s> {
sess: &'s Session,
provider: P,
lint_expectations: Vec<(LintExpectationId, LintExpectation)>,
/// Each expectation has a stable and an unstable identifier. This map
/// is used to map from unstable to stable [`LintExpectationId`]s.
expectation_id_map: FxHashMap<LintExpectationId, LintExpectationId>,
sets: LintLevelSets,
id_to_set: FxHashMap<HirId, LintStackIndex>,
cur: LintStackIndex,
warn_about_weird_lints: bool,
store: &'s LintStore,
registered_tools: &'s RegisteredTools,
}
pub(crate) struct BuilderPush {
pub struct BuilderPush {
prev: LintStackIndex,
pub changed: bool,
}
impl<'s> LintLevelsBuilder<'s, TopDown> {
pub(crate) fn new(
impl<'s> LintLevelsBuilder<'s> {
pub fn new(
sess: &'s Session,
warn_about_weird_lints: bool,
store: &'s LintStore,
@ -321,66 +75,20 @@ impl<'s> LintLevelsBuilder<'s, TopDown> {
) -> Self {
let mut builder = LintLevelsBuilder {
sess,
provider: TopDown { sets: LintLevelSets::new(), cur: COMMAND_LINE },
lint_expectations: Default::default(),
expectation_id_map: Default::default(),
sets: LintLevelSets::new(),
cur: COMMAND_LINE,
id_to_set: Default::default(),
warn_about_weird_lints,
store,
registered_tools,
};
builder.process_command_line();
assert_eq!(builder.provider.sets.list.len(), 1);
builder.process_command_line(sess, store);
assert_eq!(builder.sets.list.len(), 1);
builder
}
fn process_command_line(&mut self) {
self.provider.cur = self
.provider
.sets
.list
.push(LintSet { specs: FxHashMap::default(), parent: COMMAND_LINE });
self.add_command_line();
}
/// Pushes a list of AST lint attributes onto this context.
///
/// This function will return a `BuilderPush` object which should be passed
/// to `pop` when this scope for the attributes provided is exited.
///
/// This function will perform a number of tasks:
///
/// * It'll validate all lint-related attributes in `attrs`
/// * It'll mark all lint-related attributes as used
/// * Lint levels will be updated based on the attributes provided
/// * Lint attributes are validated, e.g., a `#[forbid]` can't be switched to
/// `#[allow]`
///
/// Don't forget to call `pop`!
pub(crate) fn push(
&mut self,
attrs: &[ast::Attribute],
is_crate_node: bool,
source_hir_id: Option<HirId>,
) -> BuilderPush {
let prev = self.provider.cur;
self.provider.cur =
self.provider.sets.list.push(LintSet { specs: FxHashMap::default(), parent: prev });
self.add(attrs, is_crate_node, source_hir_id);
if self.provider.current_specs().is_empty() {
self.provider.sets.list.pop();
self.provider.cur = prev;
}
BuilderPush { prev }
}
/// Called after `push` when the scope of a set of attributes are exited.
pub(crate) fn pop(&mut self, push: BuilderPush) {
self.provider.cur = push.prev;
}
}
impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
pub(crate) fn sess(&self) -> &Session {
self.sess
}
@ -390,20 +98,24 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
}
fn current_specs(&self) -> &FxHashMap<LintId, LevelAndSource> {
self.provider.current_specs()
&self.sets.list[self.cur].specs
}
fn current_specs_mut(&mut self) -> &mut FxHashMap<LintId, LevelAndSource> {
self.provider.current_specs_mut()
&mut self.sets.list[self.cur].specs
}
fn add_command_line(&mut self) {
for &(ref lint_name, level) in &self.sess.opts.lint_opts {
self.store.check_lint_name_cmdline(self.sess, &lint_name, level, self.registered_tools);
fn process_command_line(&mut self, sess: &Session, store: &LintStore) {
self.sets.lint_cap = sess.opts.lint_cap.unwrap_or(Level::Forbid);
self.cur =
self.sets.list.push(LintSet { specs: FxHashMap::default(), parent: COMMAND_LINE });
for &(ref lint_name, level) in &sess.opts.lint_opts {
store.check_lint_name_cmdline(sess, &lint_name, level, self.registered_tools);
let orig_level = level;
let lint_flag_val = Symbol::intern(lint_name);
let Ok(ids) = self.store.find_lints(&lint_name) else {
let Ok(ids) = store.find_lints(&lint_name) else {
// errors handled in check_lint_name_cmdline above
continue
};
@ -426,11 +138,9 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
/// Attempts to insert the `id` to `level_src` map entry. If unsuccessful
/// (e.g. if a forbid was already inserted on the same scope), then emits a
/// diagnostic with no change to `specs`.
fn insert_spec(&mut self, id: LintId, (mut level, src): LevelAndSource) {
let (old_level, old_src) = self.provider.get_lint_level(id.lint, &self.sess);
if let Level::Expect(id) = &mut level && let LintExpectationId::Stable { .. } = id {
*id = id.normalize();
}
fn insert_spec(&mut self, id: LintId, (level, src): LevelAndSource) {
let (old_level, old_src) =
self.sets.get_lint_level(id.lint, self.cur, Some(self.current_specs()), &self.sess);
// Setting to a non-forbid level is an error if the lint previously had
// a forbid level. Note that this is not necessarily true even with a
// `#[forbid(..)]` attribute present, as that is overridden by `--cap-lints`.
@ -448,7 +158,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
let id_name = id.lint.name_lower();
let fcw_warning = match old_src {
LintLevelSource::Default => false,
LintLevelSource::Node { name, .. } => self.store.is_lint_group(name),
LintLevelSource::Node(symbol, _, _) => self.store.is_lint_group(symbol),
LintLevelSource::CommandLine(symbol, _) => self.store.is_lint_group(symbol),
};
debug!(
@ -468,8 +178,8 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
id.to_string()
));
}
LintLevelSource::Node { span, reason, .. } => {
diag.span_label(span, "`forbid` level set here");
LintLevelSource::Node(_, forbid_source_span, reason) => {
diag.span_label(forbid_source_span, "`forbid` level set here");
if let Some(rationale) = reason {
diag.note(rationale.as_str());
}
@ -489,8 +199,11 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
LintLevelSource::Default => {
OverruledAttributeSub::DefaultSource { id: id.to_string() }
}
LintLevelSource::Node { span, reason, .. } => {
OverruledAttributeSub::NodeSource { span, reason }
LintLevelSource::Node(_, forbid_source_span, reason) => {
OverruledAttributeSub::NodeSource {
span: forbid_source_span,
reason,
}
}
LintLevelSource::CommandLine(_, _) => {
OverruledAttributeSub::CommandLineSource
@ -543,7 +256,29 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
};
}
fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id: Option<HirId>) {
/// Pushes a list of AST lint attributes onto this context.
///
/// This function will return a `BuilderPush` object which should be passed
/// to `pop` when this scope for the attributes provided is exited.
///
/// This function will perform a number of tasks:
///
/// * It'll validate all lint-related attributes in `attrs`
/// * It'll mark all lint-related attributes as used
/// * Lint levels will be updated based on the attributes provided
/// * Lint attributes are validated, e.g., a `#[forbid]` can't be switched to
/// `#[allow]`
///
/// Don't forget to call `pop`!
pub(crate) fn push(
&mut self,
attrs: &[ast::Attribute],
is_crate_node: bool,
source_hir_id: Option<HirId>,
) -> BuilderPush {
let prev = self.cur;
self.cur = self.sets.list.push(LintSet { specs: FxHashMap::default(), parent: prev });
let sess = self.sess;
for (attr_index, attr) in attrs.iter().enumerate() {
if attr.has_name(sym::automatically_derived) {
@ -558,17 +293,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
None => continue,
// This is the only lint level with a `LintExpectationId` that can be created from an attribute
Some(Level::Expect(unstable_id)) if let Some(hir_id) = source_hir_id => {
let LintExpectationId::Unstable { attr_id, lint_index } = unstable_id
else { bug!("stable id Level::from_attr") };
let stable_id = LintExpectationId::Stable {
hir_id,
attr_index: attr_index.try_into().unwrap(),
lint_index,
// we pass the previous unstable attr_id such that we can trace the ast id when building a map
// to go from unstable to stable id.
attr_id: Some(attr_id),
};
let stable_id = self.create_stable_id(unstable_id, hir_id, attr_index);
Level::Expect(stable_id)
}
@ -683,7 +408,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
[lint] => *lint == LintId::of(UNFULFILLED_LINT_EXPECTATIONS),
_ => false,
};
self.provider.push_expectation(
self.lint_expectations.push((
expect_id,
LintExpectation::new(
reason,
@ -691,19 +416,13 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
is_unfulfilled_lint_expectations,
tool_name,
),
);
));
}
let src = LintLevelSource::Node {
name: meta_item
.path
.segments
.last()
.expect("empty lint name")
.ident
.name,
span: sp,
let src = LintLevelSource::Node(
meta_item.path.segments.last().expect("empty lint name").ident.name,
sp,
reason,
};
);
for &id in *ids {
if self.check_gated_lint(id, attr.span) {
self.insert_spec(id, (level, src));
@ -716,26 +435,31 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
Ok(ids) => {
let complete_name =
&format!("{}::{}", tool_ident.unwrap().name, name);
let src = LintLevelSource::Node {
name: Symbol::intern(complete_name),
span: sp,
let src = LintLevelSource::Node(
Symbol::intern(complete_name),
sp,
reason,
};
);
for &id in ids {
if self.check_gated_lint(id, attr.span) {
self.insert_spec(id, (level, src));
}
}
if let Level::Expect(expect_id) = level {
self.provider.push_expectation(
self.lint_expectations.push((
expect_id,
LintExpectation::new(reason, sp, false, tool_name),
);
));
}
}
Err((Some(ids), ref new_lint_name)) => {
let lint = builtin::RENAMED_AND_REMOVED_LINTS;
let (lvl, src) = self.provider.get_lint_level(lint, &sess);
let (lvl, src) = self.sets.get_lint_level(
lint,
self.cur,
Some(self.current_specs()),
&sess,
);
struct_lint_level(
self.sess,
lint,
@ -759,19 +483,19 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
},
);
let src = LintLevelSource::Node {
name: Symbol::intern(&new_lint_name),
span: sp,
let src = LintLevelSource::Node(
Symbol::intern(&new_lint_name),
sp,
reason,
};
);
for id in ids {
self.insert_spec(*id, (level, src));
}
if let Level::Expect(expect_id) = level {
self.provider.push_expectation(
self.lint_expectations.push((
expect_id,
LintExpectation::new(reason, sp, false, tool_name),
);
));
}
}
Err((None, _)) => {
@ -797,7 +521,12 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
CheckLintNameResult::Warning(msg, renamed) => {
let lint = builtin::RENAMED_AND_REMOVED_LINTS;
let (renamed_lint_level, src) = self.provider.get_lint_level(lint, &sess);
let (renamed_lint_level, src) = self.sets.get_lint_level(
lint,
self.cur,
Some(self.current_specs()),
&sess,
);
struct_lint_level(
self.sess,
lint,
@ -820,7 +549,12 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
}
CheckLintNameResult::NoLint(suggestion) => {
let lint = builtin::UNKNOWN_LINTS;
let (level, src) = self.provider.get_lint_level(lint, self.sess);
let (level, src) = self.sets.get_lint_level(
lint,
self.cur,
Some(self.current_specs()),
self.sess,
);
struct_lint_level(self.sess, lint, level, src, Some(sp.into()), |lint| {
let name = if let Some(tool_ident) = tool_ident {
format!("{}::{}", tool_ident.name, name)
@ -849,21 +583,17 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
if let CheckLintNameResult::Ok(ids) =
self.store.check_lint_name(&new_name, None, self.registered_tools)
{
let src = LintLevelSource::Node {
name: Symbol::intern(&new_name),
span: sp,
reason,
};
let src = LintLevelSource::Node(Symbol::intern(&new_name), sp, reason);
for &id in ids {
if self.check_gated_lint(id, attr.span) {
self.insert_spec(id, (level, src));
}
}
if let Level::Expect(expect_id) = level {
self.provider.push_expectation(
self.lint_expectations.push((
expect_id,
LintExpectation::new(reason, sp, false, tool_name),
);
));
}
} else {
panic!("renamed lint does not exist: {}", new_name);
@ -878,12 +608,13 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
continue;
}
let LintLevelSource::Node { name: lint_attr_name, span: lint_attr_span, .. } = *src else {
let LintLevelSource::Node(lint_attr_name, lint_attr_span, _) = *src else {
continue
};
let lint = builtin::UNUSED_ATTRIBUTES;
let (lint_level, lint_src) = self.provider.get_lint_level(lint, &self.sess);
let (lint_level, lint_src) =
self.sets.get_lint_level(lint, self.cur, Some(self.current_specs()), self.sess);
struct_lint_level(
self.sess,
lint,
@ -903,13 +634,32 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
break;
}
}
if self.current_specs().is_empty() {
self.sets.list.pop();
self.cur = prev;
}
BuilderPush { prev, changed: prev != self.cur }
}
fn create_stable_id(
&mut self,
unstable_id: LintExpectationId,
hir_id: HirId,
attr_index: usize,
) -> LintExpectationId {
let stable_id =
LintExpectationId::Stable { hir_id, attr_index: attr_index as u16, lint_index: None };
self.expectation_id_map.insert(unstable_id, stable_id);
stable_id
}
/// Checks if the lint is gated on a feature that is not enabled.
///
/// Returns `true` if the lint's feature is enabled.
// FIXME only emit this once for each attribute, instead of repeating it 4 times for
// pre-expansion lints, post-expansion lints, `shallow_lint_levels_on` and `lint_expectations`.
fn check_gated_lint(&self, lint_id: LintId, span: Span) -> bool {
if let Some(feature) = lint_id.lint.feature_gate {
if !self.sess.features_untracked().enabled(feature) {
@ -928,14 +678,19 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
true
}
/// 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) -> LevelAndSource {
self.provider.get_lint_level(lint, self.sess)
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(crate) fn struct_lint(
pub fn struct_lint(
&self,
lint: &'static Lint,
span: Option<MultiSpan>,
@ -944,8 +699,141 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
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);
}
fn update_unstable_expectation_ids(&self) {
self.sess.diagnostic().update_unstable_expectation_id(&self.expectation_id_map);
}
pub fn build_map(self) -> LintLevelMap {
LintLevelMap {
sets: self.sets,
id_to_set: self.id_to_set,
lint_expectations: self.lint_expectations,
}
}
}
pub(crate) fn provide(providers: &mut Providers) {
*providers = Providers { shallow_lint_levels_on, lint_expectations, ..*providers };
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, Some(id));
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_expr_field(&mut self, field: &'tcx hir::ExprField<'tcx>) {
self.with_lint_attrs(field.hir_id, |builder| {
intravisit::walk_expr_field(builder, field);
})
}
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>) {
self.with_lint_attrs(v.id, |builder| {
intravisit::walk_variant(builder, v);
})
}
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);
});
}
fn visit_pat_field(&mut self, field: &'tcx hir::PatField<'tcx>) {
self.with_lint_attrs(field.hir_id, |builder| {
intravisit::walk_pat_field(builder, field);
})
}
fn visit_generic_param(&mut self, p: &'tcx hir::GenericParam<'tcx>) {
self.with_lint_attrs(p.hir_id, |builder| {
intravisit::walk_generic_param(builder, p);
});
}
}
pub fn provide(providers: &mut Providers) {
providers.lint_levels = lint_levels;
}

1
compiler/rustc_lint/src/lib.rs
View file

@ -35,7 +35,6 @@
#![feature(iter_order_by)]
#![feature(let_chains)]
#![cfg_attr(bootstrap, feature(let_else))]
#![feature(min_specialization)]
#![feature(never_type)]
#![recursion_limit = "256"]