bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Rollup merge of #128701 - veera-sivarajan:fix-128604, r=estebank

Browse source 
Don't Suggest Labeling `const` and `unsafe` Blocks

Fixes #128604

Previously, both anonymous constant blocks (E.g. The labeled block
inside `['_'; 'block: { break 'block 1 + 2; }]`) and inline const
blocks (E.g. `const { ... }`) were considered to be the same
kind of blocks. This caused the compiler to incorrectly suggest
labeling both the blocks when only anonymous constant blocks can be
labeled.

This PR adds an other enum variant to `Context` so that both the
blocks can be handled appropriately.

Also, adds some doc comments and removes unnecessary `&mut` in a
couple of places.
This commit is contained in:
Matthias Krüger 2024-09-03 19:13:23 +02:00 • committed by GitHub
commit 51c686f32b
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
5 changed files with 166 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

40
compiler/rustc_passes/src/loops.rs
View file

@ -19,17 +19,25 @@ use crate::errors::{
OutsideLoopSuggestion, UnlabeledCfInWhileCondition, UnlabeledInLabeledBlock,
};
/// The context in which a block is encountered.
#[derive(Clone, Copy, Debug, PartialEq)]
enum Context {
Normal,
Fn,
Loop(hir::LoopSource),
Closure(Span),
Coroutine { coroutine_span: Span, kind: hir::CoroutineDesugaring, source: hir::CoroutineSource },
Coroutine {
coroutine_span: Span,
kind: hir::CoroutineDesugaring,
source: hir::CoroutineSource,
},
UnlabeledBlock(Span),
UnlabeledIfBlock(Span),
LabeledBlock,
Constant,
/// E.g. The labeled block inside `['_'; 'block: { break 'block 1 + 2; }]`.
AnonConst,
/// E.g. `const { ... }`.
ConstBlock,
}
#[derive(Clone)]
@ -90,11 +98,11 @@ impl<'a, 'hir> Visitor<'hir> for CheckLoopVisitor<'a, 'hir> {
}
fn visit_anon_const(&mut self, c: &'hir hir::AnonConst) {
self.with_context(Constant, |v| intravisit::walk_anon_const(v, c));
self.with_context(AnonConst, |v| intravisit::walk_anon_const(v, c));
}
fn visit_inline_const(&mut self, c: &'hir hir::ConstBlock) {
self.with_context(Constant, |v| intravisit::walk_inline_const(v, c));
self.with_context(ConstBlock, |v| intravisit::walk_inline_const(v, c));
}
fn visit_fn(
@ -128,7 +136,7 @@ impl<'a, 'hir> Visitor<'hir> for CheckLoopVisitor<'a, 'hir> {
&& matches!(
ck_loop.cx_stack.last(),
Some(&Normal)
| Some(&Constant)
| Some(&AnonConst)
| Some(&UnlabeledBlock(_))
| Some(&UnlabeledIfBlock(_))
)
@ -175,14 +183,18 @@ impl<'a, 'hir> Visitor<'hir> for CheckLoopVisitor<'a, 'hir> {
hir::ExprKind::Block(ref b, Some(_label)) => {
self.with_context(LabeledBlock, |v| v.visit_block(b));
}
hir::ExprKind::Block(ref b, None) if matches!(self.cx_stack.last(), Some(&Fn)) => {
hir::ExprKind::Block(ref b, None)
if matches!(self.cx_stack.last(), Some(&Fn) | Some(&ConstBlock)) =>
{
self.with_context(Normal, |v| v.visit_block(b));
}
hir::ExprKind::Block(ref b, None)
if matches!(
self.cx_stack.last(),
Some(&Normal) | Some(&Constant) | Some(&UnlabeledBlock(_))
) =>
hir::ExprKind::Block(
ref b @ hir::Block { rules: hir::BlockCheckMode::DefaultBlock, .. },
None,
) if matches!(
self.cx_stack.last(),
Some(&Normal) | Some(&AnonConst) | Some(&UnlabeledBlock(_))
) =>
{
self.with_context(UnlabeledBlock(b.span.shrink_to_lo()), |v| v.visit_block(b));
}
@ -353,7 +365,7 @@ impl<'a, 'hir> CheckLoopVisitor<'a, 'hir> {
UnlabeledIfBlock(_) if br_cx_kind == BreakContextKind::Break => {
self.require_break_cx(br_cx_kind, span, break_span, cx_pos - 1);
}
Normal | Constant | Fn | UnlabeledBlock(_) | UnlabeledIfBlock(_) => {
Normal | AnonConst | Fn | UnlabeledBlock(_) | UnlabeledIfBlock(_) | ConstBlock => {
self.sess.dcx().emit_err(OutsideLoop {
spans: vec![span],
name: &br_cx_kind.to_string(),
@ -365,7 +377,7 @@ impl<'a, 'hir> CheckLoopVisitor<'a, 'hir> {
}
fn require_label_in_labeled_block(
&mut self,
&self,
span: Span,
label: &Destination,
cf_type: &str,
@ -380,7 +392,7 @@ impl<'a, 'hir> CheckLoopVisitor<'a, 'hir> {
false
}
fn report_outside_loop_error(&mut self) {
fn report_outside_loop_error(&self) {
for (s, block) in &self.block_breaks {
self.sess.dcx().emit_err(OutsideLoop {
spans: block.spans.clone(),