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Auto merge of #96745 - ehuss:even-more-attribute-validation, r=cjgillot

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Visit attributes in more places.

This adds 3 loosely related changes (I can split PRs if desired):

- Attribute checking on pattern struct fields.
- Attribute checking on struct expression fields.
- Lint level visiting on pattern struct fields, struct expression fields, and generic parameters.

There are still some lints which ignore lint levels in various positions. This is a consequence of how the lints themselves are implemented. For example, lint levels on associated consts don't work with `unused_braces`.
This commit is contained in:
bors 2022-08-15 05:50:54 +00:00
commit 6ce76091c7
23 changed files with 1520 additions and 141 deletions
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13
compiler/rustc_lint/src/early.rs
View file

@ -101,6 +101,12 @@ impl<'a, T: EarlyLintPass> ast_visit::Visitor<'a> for EarlyContextAndPass<'a, T>
run_early_pass!(self, check_pat_post, p);
}
fn visit_pat_field(&mut self, field: &'a ast::PatField) {
self.with_lint_attrs(field.id, &field.attrs, |cx| {
ast_visit::walk_pat_field(cx, field);
});
}
fn visit_anon_const(&mut self, c: &'a ast::AnonConst) {
self.check_id(c.id);
ast_visit::walk_anon_const(self, c);
@ -219,9 +225,10 @@ impl<'a, T: EarlyLintPass> ast_visit::Visitor<'a> for EarlyContextAndPass<'a, T>
}
fn visit_generic_param(&mut self, param: &'a ast::GenericParam) {
run_early_pass!(self, check_generic_param, param);
self.check_id(param.id);
ast_visit::walk_generic_param(self, param);
self.with_lint_attrs(param.id, &param.attrs, |cx| {
run_early_pass!(cx, check_generic_param, param);
ast_visit::walk_generic_param(cx, param);
});
}
fn visit_generics(&mut self, g: &'a ast::Generics) {

18
compiler/rustc_lint/src/levels.rs
View file

@ -766,6 +766,12 @@ impl<'tcx> intravisit::Visitor<'tcx> for LintLevelMapBuilder<'tcx> {
})
}
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);
@ -801,6 +807,18 @@ impl<'tcx> intravisit::Visitor<'tcx> for LintLevelMapBuilder<'tcx> {
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) {

17
compiler/rustc_lint/src/nonstandard_style.rs
View file

@ -437,19 +437,14 @@ impl<'tcx> LateLintPass<'tcx> for NonSnakeCase {
fn check_pat(&mut self, cx: &LateContext<'_>, p: &hir::Pat<'_>) {
if let PatKind::Binding(_, hid, ident, _) = p.kind {
if let hir::Node::Pat(parent_pat) = cx.tcx.hir().get(cx.tcx.hir().get_parent_node(hid))
if let hir::Node::PatField(field) = cx.tcx.hir().get(cx.tcx.hir().get_parent_node(hid))
{
if let PatKind::Struct(_, field_pats, _) = &parent_pat.kind {
if field_pats
.iter()
.any(|field| !field.is_shorthand && field.pat.hir_id == p.hir_id)
{
// Only check if a new name has been introduced, to avoid warning
// on both the struct definition and this pattern.
self.check_snake_case(cx, "variable", &ident);
}
return;
if !field.is_shorthand {
// Only check if a new name has been introduced, to avoid warning
// on both the struct definition and this pattern.
self.check_snake_case(cx, "variable", &ident);
}
return;
}
self.check_snake_case(cx, "variable", &ident);
}

98
compiler/rustc_lint/src/types.rs
View file

@ -125,45 +125,51 @@ fn lint_overflowing_range_endpoint<'tcx>(
lit_val: u128,
max: u128,
expr: &'tcx hir::Expr<'tcx>,
parent_expr: &'tcx hir::Expr<'tcx>,
ty: &str,
) -> bool {
// We only want to handle exclusive (`..`) ranges,
// which are represented as `ExprKind::Struct`.
let par_id = cx.tcx.hir().get_parent_node(expr.hir_id);
let Node::ExprField(field) = cx.tcx.hir().get(par_id) else { return false };
let field_par_id = cx.tcx.hir().get_parent_node(field.hir_id);
let Node::Expr(struct_expr) = cx.tcx.hir().get(field_par_id) else { return false };
if !is_range_literal(struct_expr) {
return false;
};
let ExprKind::Struct(_, eps, _) = &struct_expr.kind else { return false };
if eps.len() != 2 {
return false;
}
let mut overwritten = false;
if let ExprKind::Struct(_, eps, _) = &parent_expr.kind {
if eps.len() != 2 {
return false;
}
// We can suggest using an inclusive range
// (`..=`) instead only if it is the `end` that is
// overflowing and only by 1.
if eps[1].expr.hir_id == expr.hir_id && lit_val - 1 == max {
cx.struct_span_lint(OVERFLOWING_LITERALS, parent_expr.span, |lint| {
let mut err = lint.build(fluent::lint::range_endpoint_out_of_range);
err.set_arg("ty", ty);
if let Ok(start) = cx.sess().source_map().span_to_snippet(eps[0].span) {
use ast::{LitIntType, LitKind};
// We need to preserve the literal's suffix,
// as it may determine typing information.
let suffix = match lit.node {
LitKind::Int(_, LitIntType::Signed(s)) => s.name_str(),
LitKind::Int(_, LitIntType::Unsigned(s)) => s.name_str(),
LitKind::Int(_, LitIntType::Unsuffixed) => "",
_ => bug!(),
};
let suggestion = format!("{}..={}{}", start, lit_val - 1, suffix);
err.span_suggestion(
parent_expr.span,
fluent::lint::suggestion,
suggestion,
Applicability::MachineApplicable,
);
err.emit();
overwritten = true;
}
});
}
// We can suggest using an inclusive range
// (`..=`) instead only if it is the `end` that is
// overflowing and only by 1.
if eps[1].expr.hir_id == expr.hir_id && lit_val - 1 == max {
cx.struct_span_lint(OVERFLOWING_LITERALS, struct_expr.span, |lint| {
let mut err = lint.build(fluent::lint::range_endpoint_out_of_range);
err.set_arg("ty", ty);
if let Ok(start) = cx.sess().source_map().span_to_snippet(eps[0].span) {
use ast::{LitIntType, LitKind};
// We need to preserve the literal's suffix,
// as it may determine typing information.
let suffix = match lit.node {
LitKind::Int(_, LitIntType::Signed(s)) => s.name_str(),
LitKind::Int(_, LitIntType::Unsigned(s)) => s.name_str(),
LitKind::Int(_, LitIntType::Unsuffixed) => "",
_ => bug!(),
};
let suggestion = format!("{}..={}{}", start, lit_val - 1, suffix);
err.span_suggestion(
struct_expr.span,
fluent::lint::suggestion,
suggestion,
Applicability::MachineApplicable,
);
err.emit();
overwritten = true;
}
});
}
overwritten
}
@ -339,16 +345,9 @@ fn lint_int_literal<'tcx>(
return;
}
let par_id = cx.tcx.hir().get_parent_node(e.hir_id);
if let Node::Expr(par_e) = cx.tcx.hir().get(par_id) {
if let hir::ExprKind::Struct(..) = par_e.kind {
if is_range_literal(par_e)
&& lint_overflowing_range_endpoint(cx, lit, v, max, e, par_e, t.name_str())
{
// The overflowing literal lint was overridden.
return;
}
}
if lint_overflowing_range_endpoint(cx, lit, v, max, e, t.name_str()) {
// The overflowing literal lint was overridden.
return;
}
cx.struct_span_lint(OVERFLOWING_LITERALS, e.span, |lint| {
@ -408,16 +407,13 @@ fn lint_uint_literal<'tcx>(
return;
}
}
hir::ExprKind::Struct(..) if is_range_literal(par_e) => {
let t = t.name_str();
if lint_overflowing_range_endpoint(cx, lit, lit_val, max, e, par_e, t) {
// The overflowing literal lint was overridden.
return;
}
}
_ => {}
}
}
if lint_overflowing_range_endpoint(cx, lit, lit_val, max, e, t.name_str()) {
// The overflowing literal lint was overridden.
return;
}
if let Some(repr_str) = get_bin_hex_repr(cx, lit) {
report_bin_hex_error(
cx,