bjoernager/rust
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Abstract MatchCheckCtxt into a trait

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This commit is contained in:
Nadrieril 2023-12-11 20:01:02 +01:00
parent 3ad76f9325
commit 3d7c4df326
8 changed files with 313 additions and 239 deletions
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40
compiler/rustc_mir_build/src/thir/pattern/check_match.rs
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@ -1,8 +1,7 @@
use rustc_pattern_analysis::constructor::Constructor;
use rustc_pattern_analysis::cx::MatchCheckCtxt;
use rustc_pattern_analysis::cx::{
Constructor, DeconstructedPat, MatchCheckCtxt, Usefulness, UsefulnessReport, WitnessPat,
};
use rustc_pattern_analysis::errors::Uncovered;
use rustc_pattern_analysis::pat::{DeconstructedPat, WitnessPat};
use rustc_pattern_analysis::usefulness::{Usefulness, UsefulnessReport};
use rustc_pattern_analysis::{analyze_match, MatchArm};
use crate::errors::*;
@ -851,14 +850,15 @@ fn report_arm_reachability<'p, 'tcx>(
);
};
use Usefulness::*;
let mut catchall = None;
for (arm, is_useful) in report.arm_usefulness.iter() {
match is_useful {
Redundant => report_unreachable_pattern(arm.pat.span(), arm.hir_id, catchall),
Useful(redundant_spans) if redundant_spans.is_empty() => {}
Usefulness::Redundant => {
report_unreachable_pattern(*arm.pat.span(), arm.hir_id, catchall)
}
Usefulness::Useful(redundant_spans) if redundant_spans.is_empty() => {}
// The arm is reachable, but contains redundant subpatterns (from or-patterns).
Useful(redundant_spans) => {
Usefulness::Useful(redundant_spans) => {
let mut redundant_spans = redundant_spans.clone();
// Emit lints in the order in which they occur in the file.
redundant_spans.sort_unstable();
@ -868,17 +868,16 @@ fn report_arm_reachability<'p, 'tcx>(
}
}
if !arm.has_guard && catchall.is_none() && pat_is_catchall(arm.pat) {
catchall = Some(arm.pat.span());
catchall = Some(*arm.pat.span());
}
}
}
/// Checks for common cases of "catchall" patterns that may not be intended as such.
fn pat_is_catchall(pat: &DeconstructedPat<'_, '_>) -> bool {
use Constructor::*;
match pat.ctor() {
Wildcard => true,
Struct | Ref => pat.iter_fields().all(|pat| pat_is_catchall(pat)),
Constructor::Wildcard => true,
Constructor::Struct | Constructor::Ref => pat.iter_fields().all(|pat| pat_is_catchall(pat)),
_ => false,
}
}
@ -889,7 +888,7 @@ fn report_non_exhaustive_match<'p, 'tcx>(
thir: &Thir<'tcx>,
scrut_ty: Ty<'tcx>,
sp: Span,
witnesses: Vec<WitnessPat<'tcx>>,
witnesses: Vec<WitnessPat<'p, 'tcx>>,
arms: &[ArmId],
expr_span: Span,
) -> ErrorGuaranteed {
@ -1086,10 +1085,10 @@ fn report_non_exhaustive_match<'p, 'tcx>(
fn joined_uncovered_patterns<'p, 'tcx>(
cx: &MatchCheckCtxt<'p, 'tcx>,
witnesses: &[WitnessPat<'tcx>],
witnesses: &[WitnessPat<'p, 'tcx>],
) -> String {
const LIMIT: usize = 3;
let pat_to_str = |pat: &WitnessPat<'tcx>| cx.hoist_witness_pat(pat).to_string();
let pat_to_str = |pat: &WitnessPat<'p, 'tcx>| cx.hoist_witness_pat(pat).to_string();
match witnesses {
[] => bug!(),
[witness] => format!("`{}`", cx.hoist_witness_pat(witness)),
@ -1107,7 +1106,7 @@ fn joined_uncovered_patterns<'p, 'tcx>(
fn collect_non_exhaustive_tys<'tcx>(
cx: &MatchCheckCtxt<'_, 'tcx>,
pat: &WitnessPat<'tcx>,
pat: &WitnessPat<'_, 'tcx>,
non_exhaustive_tys: &mut FxIndexSet<Ty<'tcx>>,
) {
if matches!(pat.ctor(), Constructor::NonExhaustive) {
@ -1126,7 +1125,7 @@ fn collect_non_exhaustive_tys<'tcx>(
fn report_adt_defined_here<'tcx>(
tcx: TyCtxt<'tcx>,
ty: Ty<'tcx>,
witnesses: &[WitnessPat<'tcx>],
witnesses: &[WitnessPat<'_, 'tcx>],
point_at_non_local_ty: bool,
) -> Option<AdtDefinedHere<'tcx>> {
let ty = ty.peel_refs();
@ -1148,15 +1147,14 @@ fn report_adt_defined_here<'tcx>(
Some(AdtDefinedHere { adt_def_span, ty, variants })
}
fn maybe_point_at_variant<'a, 'tcx: 'a>(
fn maybe_point_at_variant<'a, 'p: 'a, 'tcx: 'p>(
tcx: TyCtxt<'tcx>,
def: AdtDef<'tcx>,
patterns: impl Iterator<Item = &'a WitnessPat<'tcx>>,
patterns: impl Iterator<Item = &'a WitnessPat<'p, 'tcx>>,
) -> Vec<Span> {
use Constructor::*;
let mut covered = vec![];
for pattern in patterns {
if let Variant(variant_index) = pattern.ctor() {
if let Constructor::Variant(variant_index) = pattern.ctor() {
if let ty::Adt(this_def, _) = pattern.ty().kind()
&& this_def.did() != def.did()
{