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use rustc_data_structures::fx::FxIndexMap;
use rustc_hir::{HirId, CRATE_OWNER_ID};
use rustc_middle::lint::LintExpectation;
use rustc_middle::query::Providers;
use rustc_middle::ty::TyCtxt;
use rustc_session::lint::builtin::UNFULFILLED_LINT_EXPECTATIONS;
use rustc_session::lint::{Level, LintExpectationId};
use rustc_span::Symbol;
use crate::lints::{Expectation, ExpectationNote};
pub(crate) fn provide(providers: &mut Providers) {
*providers = Providers { lint_expectations, check_expectations, ..*providers };
}
fn lint_expectations(tcx: TyCtxt<'_>, (): ()) -> Vec<(LintExpectationId, LintExpectation)> {
let krate = tcx.hir_crate_items(());
let mut expectations = Vec::new();
let mut unstable_to_stable_ids = FxIndexMap::default();
let mut record_stable = |attr_id, hir_id, attr_index| {
let expect_id = LintExpectationId::Stable { hir_id, attr_index, lint_index: None };
unstable_to_stable_ids.entry(attr_id).or_insert(expect_id);
};
let mut push_expectations = |owner| {
let lints = tcx.shallow_lint_levels_on(owner);
if lints.expectations.is_empty() {
return;
}
expectations.extend_from_slice(&lints.expectations);
let attrs = tcx.hir_attrs(owner);
for &(local_id, attrs) in attrs.map.iter() {
// Some attributes appear multiple times in HIR, to ensure they are correctly taken
// into account where they matter. This means we cannot just associate the AttrId to
// the first HirId where we see it, but need to check it actually appears in a lint
// level.
// FIXME(cjgillot): Can this cause an attribute to appear in multiple expectation ids?
if !lints.specs.contains_key(&local_id) {
continue;
}
for (attr_index, attr) in attrs.iter().enumerate() {
let Some(Level::Expect(_)) = Level::from_attr(attr) else { continue };
record_stable(attr.id, HirId { owner, local_id }, attr_index.try_into().unwrap());
}
}
};
push_expectations(CRATE_OWNER_ID);
for owner in krate.owners() {
push_expectations(owner);
}
tcx.dcx().update_unstable_expectation_id(unstable_to_stable_ids);
expectations
}
fn check_expectations(tcx: TyCtxt<'_>, tool_filter: Option<Symbol>) {
let lint_expectations = tcx.lint_expectations(());
let fulfilled_expectations = tcx.dcx().steal_fulfilled_expectation_ids();
for (id, expectation) in lint_expectations {
// This check will always be true, since `lint_expectations` only
// holds stable ids
if let LintExpectationId::Stable { hir_id, .. } = id {
if !fulfilled_expectations.contains(id)
&& tool_filter.map_or(true, |filter| expectation.lint_tool == Some(filter))
{
let rationale = expectation.reason.map(|rationale| ExpectationNote { rationale });
let note = expectation.is_unfulfilled_lint_expectations;
tcx.emit_node_span_lint(
UNFULFILLED_LINT_EXPECTATIONS,
*hir_id,
expectation.emission_span,
Expectation { rationale, note },
);
}
} else {
unreachable!("at this stage all `LintExpectationId`s are stable");
}
}
}
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