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Auto merge of #127543 - carbotaniuman:more_unsafe_attr_verification, r=estebank,traviscross

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More unsafe attr verification

This code denies unsafe on attributes such as `#[test]` and `#[ignore]`, while also changing the `MetaItem` parsing so `unsafe` in args like `#[allow(unsafe(dead_code))]` is not accidentally allowed.

Tracking:

- https://github.com/rust-lang/rust/issues/123757
This commit is contained in:
bors 2024-08-01 10:40:45 +00:00
commit c0e32983f5
22 changed files with 471 additions and 92 deletions
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3
compiler/rustc_builtin_macros/messages.ftl
View File

@ -115,9 +115,6 @@ builtin_macros_derive_path_args_list = traits in `#[derive(...)]` don't accept a
builtin_macros_derive_path_args_value = traits in `#[derive(...)]` don't accept values
.suggestion = remove the value
builtin_macros_derive_unsafe_path = traits in `#[derive(...)]` don't accept `unsafe(...)`
.suggestion = remove the `unsafe(...)`
builtin_macros_env_not_defined = environment variable `{$var}` not defined at compile time
.cargo = Cargo sets build script variables at run time. Use `std::env::var({$var_expr})` instead
.custom = use `std::env::var({$var_expr})` to read the variable at run time

3
compiler/rustc_builtin_macros/src/cfg.rs
View File

@ -6,6 +6,7 @@ use rustc_ast::token;
use rustc_ast::tokenstream::TokenStream;
use rustc_errors::PResult;
use rustc_expand::base::{DummyResult, ExpandResult, ExtCtxt, MacEager, MacroExpanderResult};
use rustc_parse::parser::attr::AllowLeadingUnsafe;
use rustc_span::Span;
use {rustc_ast as ast, rustc_attr as attr};
@ -42,7 +43,7 @@ fn parse_cfg<'a>(cx: &ExtCtxt<'a>, span: Span, tts: TokenStream) -> PResult<'a,
return Err(cx.dcx().create_err(errors::RequiresCfgPattern { span }));
}
let cfg = p.parse_meta_item()?;
let cfg = p.parse_meta_item(AllowLeadingUnsafe::Yes)?;
let _ = p.eat(&token::Comma);

2
compiler/rustc_builtin_macros/src/cfg_accessible.rs
View File

@ -47,11 +47,13 @@ impl MultiItemModifier for Expander {
) -> ExpandResult<Vec<Annotatable>, Annotatable> {
let template = AttributeTemplate { list: Some("path"), ..Default::default() };
validate_attr::check_builtin_meta_item(
&ecx.ecfg.features,
&ecx.sess.psess,
meta_item,
ast::AttrStyle::Outer,
sym::cfg_accessible,
template,
true,
);
let Some(path) = validate_input(ecx, meta_item) else {

15
compiler/rustc_builtin_macros/src/derive.rs
View File

@ -1,5 +1,5 @@
use rustc_ast as ast;
use rustc_ast::{GenericParamKind, ItemKind, MetaItemKind, NestedMetaItem, Safety, StmtKind};
use rustc_ast::{GenericParamKind, ItemKind, MetaItemKind, NestedMetaItem, StmtKind};
use rustc_expand::base::{
Annotatable, DeriveResolution, ExpandResult, ExtCtxt, Indeterminate, MultiItemModifier,
};
@ -38,11 +38,13 @@ impl MultiItemModifier for Expander {
let template =
AttributeTemplate { list: Some("Trait1, Trait2, ..."), ..Default::default() };
validate_attr::check_builtin_meta_item(
features,
&sess.psess,
meta_item,
ast::AttrStyle::Outer,
sym::derive,
template,
true,
);
let mut resolutions = match &meta_item.kind {
@ -60,7 +62,6 @@ impl MultiItemModifier for Expander {
// Reject `#[derive(Debug = "value", Debug(abc))]`, but recover the
// paths.
report_path_args(sess, meta);
report_unsafe_args(sess, meta);
meta.path.clone()
})
.map(|path| DeriveResolution {
@ -160,13 +161,3 @@ fn report_path_args(sess: &Session, meta: &ast::MetaItem) {
}
}
}
fn report_unsafe_args(sess: &Session, meta: &ast::MetaItem) {
match meta.unsafety {
Safety::Unsafe(span) => {
sess.dcx().emit_err(errors::DeriveUnsafePath { span });
}
Safety::Default => {}
Safety::Safe(_) => unreachable!(),
}
}

7
compiler/rustc_builtin_macros/src/errors.rs
View File

@ -297,13 +297,6 @@ pub(crate) struct DerivePathArgsValue {
pub(crate) span: Span,
}
#[derive(Diagnostic)]
#[diag(builtin_macros_derive_unsafe_path)]
pub(crate) struct DeriveUnsafePath {
#[primary_span]
pub(crate) span: Span,
}
#[derive(Diagnostic)]
#[diag(builtin_macros_no_default_variant)]
#[help]

2
compiler/rustc_builtin_macros/src/util.rs
View File

@ -17,11 +17,13 @@ pub(crate) fn check_builtin_macro_attribute(ecx: &ExtCtxt<'_>, meta_item: &MetaI
// All the built-in macro attributes are "words" at the moment.
let template = AttributeTemplate { word: true, ..Default::default() };
validate_attr::check_builtin_meta_item(
&ecx.ecfg.features,
&ecx.sess.psess,
meta_item,
AttrStyle::Outer,
name,
template,
true,
);
}

18
compiler/rustc_expand/src/config.rs
View File

@ -8,7 +8,9 @@ use rustc_ast::tokenstream::{
use rustc_ast::{self as ast, AttrStyle, Attribute, HasAttrs, HasTokens, MetaItem, NodeId};
use rustc_attr as attr;
use rustc_data_structures::flat_map_in_place::FlatMapInPlace;
use rustc_feature::{Features, ACCEPTED_FEATURES, REMOVED_FEATURES, UNSTABLE_FEATURES};
use rustc_feature::{
AttributeSafety, Features, ACCEPTED_FEATURES, REMOVED_FEATURES, UNSTABLE_FEATURES,
};
use rustc_lint_defs::BuiltinLintDiag;
use rustc_parse::validate_attr;
use rustc_session::parse::feature_err;
@ -263,6 +265,13 @@ impl<'a> StripUnconfigured<'a> {
/// is in the original source file. Gives a compiler error if the syntax of
/// the attribute is incorrect.
pub(crate) fn expand_cfg_attr(&self, cfg_attr: &Attribute, recursive: bool) -> Vec<Attribute> {
validate_attr::check_attribute_safety(
self.features.unwrap_or(&Features::default()),
&self.sess.psess,
AttributeSafety::Normal,
&cfg_attr,
);
let Some((cfg_predicate, expanded_attrs)) =
rustc_parse::parse_cfg_attr(cfg_attr, &self.sess.psess)
else {
@ -385,6 +394,13 @@ impl<'a> StripUnconfigured<'a> {
return (true, None);
}
};
validate_attr::deny_builtin_meta_unsafety(
self.features.unwrap_or(&Features::default()),
&self.sess.psess,
&meta_item,
);
(
parse_cfg(&meta_item, self.sess).map_or(true, |meta_item| {
attr::cfg_matches(meta_item, &self.sess, self.lint_node_id, self.features)

5
compiler/rustc_interface/src/interface.rs
View File

@ -15,6 +15,7 @@ use rustc_middle::ty;
use rustc_middle::ty::CurrentGcx;
use rustc_middle::util::Providers;
use rustc_parse::new_parser_from_source_str;
use rustc_parse::parser::attr::AllowLeadingUnsafe;
use rustc_query_impl::QueryCtxt;
use rustc_query_system::query::print_query_stack;
use rustc_session::config::{self, Cfg, CheckCfg, ExpectedValues, Input, OutFileName};
@ -67,7 +68,7 @@ pub(crate) fn parse_cfg(dcx: DiagCtxtHandle<'_>, cfgs: Vec<String>) -> Cfg {
}
match new_parser_from_source_str(&psess, filename, s.to_string()) {
Ok(mut parser) => match parser.parse_meta_item() {
Ok(mut parser) => match parser.parse_meta_item(AllowLeadingUnsafe::No) {
Ok(meta_item) if parser.token == token::Eof => {
if meta_item.path.segments.len() != 1 {
error!("argument key must be an identifier");
@ -173,7 +174,7 @@ pub(crate) fn parse_check_cfg(dcx: DiagCtxtHandle<'_>, specs: Vec<String>) -> Ch
}
};
let meta_item = match parser.parse_meta_item() {
let meta_item = match parser.parse_meta_item(AllowLeadingUnsafe::Yes) {
Ok(meta_item) if parser.token == token::Eof => meta_item,
Ok(..) => expected_error(),
Err(err) => {

1
compiler/rustc_parse/messages.ftl
View File

@ -365,6 +365,7 @@ parse_inner_doc_comment_not_permitted = expected outer doc comment
.sugg_change_inner_to_outer = to annotate the {$item}, change the doc comment from inner to outer style
parse_invalid_attr_unsafe = `{$name}` is not an unsafe attribute
.label = this is not an unsafe attribute
.suggestion = remove the `unsafe(...)`
.note = extraneous unsafe is not allowed in attributes

1
compiler/rustc_parse/src/errors.rs
View File

@ -3183,6 +3183,7 @@ pub(crate) struct DotDotRangeAttribute {
#[note]
pub struct InvalidAttrUnsafe {
#[primary_span]
#[label]
pub span: Span,
pub name: Path,
}

21
compiler/rustc_parse/src/parser/attr.rs
View File

@ -31,6 +31,12 @@ enum OuterAttributeType {
Attribute,
}
#[derive(Clone, Copy, PartialEq, Eq)]
pub enum AllowLeadingUnsafe {
Yes,
No,
}
impl<'a> Parser<'a> {
/// Parses attributes that appear before an item.
pub(super) fn parse_outer_attributes(&mut self) -> PResult<'a, AttrWrapper> {
@ -332,7 +338,7 @@ impl<'a> Parser<'a> {
/// Parses `cfg_attr(pred, attr_item_list)` where `attr_item_list` is comma-delimited.
pub fn parse_cfg_attr(&mut self) -> PResult<'a, (ast::MetaItem, Vec<(ast::AttrItem, Span)>)> {
let cfg_predicate = self.parse_meta_item()?;
let cfg_predicate = self.parse_meta_item(AllowLeadingUnsafe::No)?;
self.expect(&token::Comma)?;
// Presumably, the majority of the time there will only be one attr.
@ -368,7 +374,10 @@ impl<'a> Parser<'a> {
/// MetaItem = SimplePath ( '=' UNSUFFIXED_LIT | '(' MetaSeq? ')' )? ;
/// MetaSeq = MetaItemInner (',' MetaItemInner)* ','? ;
/// ```
pub fn parse_meta_item(&mut self) -> PResult<'a, ast::MetaItem> {
pub fn parse_meta_item(
&mut self,
unsafe_allowed: AllowLeadingUnsafe,
) -> PResult<'a, ast::MetaItem> {
// We can't use `maybe_whole` here because it would bump in the `None`
// case, which we don't want.
if let token::Interpolated(nt) = &self.token.kind
@ -384,7 +393,11 @@ impl<'a> Parser<'a> {
}
let lo = self.token.span;
let is_unsafe = self.eat_keyword(kw::Unsafe);
let is_unsafe = if unsafe_allowed == AllowLeadingUnsafe::Yes {
self.eat_keyword(kw::Unsafe)
} else {
false
};
let unsafety = if is_unsafe {
let unsafe_span = self.prev_token.span;
self.psess.gated_spans.gate(sym::unsafe_attributes, unsafe_span);
@ -427,7 +440,7 @@ impl<'a> Parser<'a> {
Err(err) => err.cancel(), // we provide a better error below
}
match self.parse_meta_item() {
match self.parse_meta_item(AllowLeadingUnsafe::No) {
Ok(mi) => return Ok(ast::NestedMetaItem::MetaItem(mi)),
Err(err) => err.cancel(), // we provide a better error below
}

148
compiler/rustc_parse/src/validate_attr.rs
View File

@ -26,76 +26,35 @@ pub fn check_attr(features: &Features, psess: &ParseSess, attr: &Attribute) {
let attr_info = attr.ident().and_then(|ident| BUILTIN_ATTRIBUTE_MAP.get(&ident.name));
let attr_item = attr.get_normal_item();
let is_unsafe_attr = attr_info.is_some_and(|attr| attr.safety == AttributeSafety::Unsafe);
if features.unsafe_attributes {
if is_unsafe_attr {
if let ast::Safety::Default = attr_item.unsafety {
let path_span = attr_item.path.span;
// If the `attr_item`'s span is not from a macro, then just suggest
// wrapping it in `unsafe(...)`. Otherwise, we suggest putting the
// `unsafe(`, `)` right after and right before the opening and closing
// square bracket respectively.
let diag_span = if attr_item.span().can_be_used_for_suggestions() {
attr_item.span()
} else {
attr.span
.with_lo(attr.span.lo() + BytePos(2))
.with_hi(attr.span.hi() - BytePos(1))
};
if attr.span.at_least_rust_2024() {
psess.dcx().emit_err(errors::UnsafeAttrOutsideUnsafe {
span: path_span,
suggestion: errors::UnsafeAttrOutsideUnsafeSuggestion {
left: diag_span.shrink_to_lo(),
right: diag_span.shrink_to_hi(),
},
});
} else {
psess.buffer_lint(
UNSAFE_ATTR_OUTSIDE_UNSAFE,
path_span,
ast::CRATE_NODE_ID,
BuiltinLintDiag::UnsafeAttrOutsideUnsafe {
attribute_name_span: path_span,
sugg_spans: (diag_span.shrink_to_lo(), diag_span.shrink_to_hi()),
},
);
}
}
} else {
if let Safety::Unsafe(unsafe_span) = attr_item.unsafety {
psess.dcx().emit_err(errors::InvalidAttrUnsafe {
span: unsafe_span,
name: attr_item.path.clone(),
});
}
}
}
// All non-builtin attributes are considered safe
let safety = attr_info.map(|x| x.safety).unwrap_or(AttributeSafety::Normal);
check_attribute_safety(features, psess, safety, attr);
// Check input tokens for built-in and key-value attributes.
match attr_info {
// `rustc_dummy` doesn't have any restrictions specific to built-in attributes.
Some(BuiltinAttribute { name, template, .. }) if *name != sym::rustc_dummy => {
match parse_meta(psess, attr) {
Ok(meta) => check_builtin_meta_item(psess, &meta, attr.style, *name, *template),
// Don't check safety again, we just did that
Ok(meta) => check_builtin_meta_item(
features, psess, &meta, attr.style, *name, *template, false,
),
Err(err) => {
err.emit();
}
}
}
_ if let AttrArgs::Eq(..) = attr_item.args => {
// All key-value attributes are restricted to meta-item syntax.
match parse_meta(psess, attr) {
Ok(_) => {}
Err(err) => {
err.emit();
_ => {
if let AttrArgs::Eq(..) = attr_item.args {
// All key-value attributes are restricted to meta-item syntax.
match parse_meta(psess, attr) {
Ok(_) => {}
Err(err) => {
err.emit();
}
}
}
}
_ => {}
}
}
@ -198,12 +157,85 @@ fn is_attr_template_compatible(template: &AttributeTemplate, meta: &ast::MetaIte
}
}
pub fn check_attribute_safety(
features: &Features,
psess: &ParseSess,
safety: AttributeSafety,
attr: &Attribute,
) {
if !features.unsafe_attributes {
return;
}
let attr_item = attr.get_normal_item();
if safety == AttributeSafety::Unsafe {
if let ast::Safety::Default = attr_item.unsafety {
let path_span = attr_item.path.span;
// If the `attr_item`'s span is not from a macro, then just suggest
// wrapping it in `unsafe(...)`. Otherwise, we suggest putting the
// `unsafe(`, `)` right after and right before the opening and closing
// square bracket respectively.
let diag_span = if attr_item.span().can_be_used_for_suggestions() {
attr_item.span()
} else {
attr.span.with_lo(attr.span.lo() + BytePos(2)).with_hi(attr.span.hi() - BytePos(1))
};
if attr.span.at_least_rust_2024() {
psess.dcx().emit_err(errors::UnsafeAttrOutsideUnsafe {
span: path_span,
suggestion: errors::UnsafeAttrOutsideUnsafeSuggestion {
left: diag_span.shrink_to_lo(),
right: diag_span.shrink_to_hi(),
},
});
} else {
psess.buffer_lint(
UNSAFE_ATTR_OUTSIDE_UNSAFE,
path_span,
ast::CRATE_NODE_ID,
BuiltinLintDiag::UnsafeAttrOutsideUnsafe {
attribute_name_span: path_span,
sugg_spans: (diag_span.shrink_to_lo(), diag_span.shrink_to_hi()),
},
);
}
}
} else {
if let Safety::Unsafe(unsafe_span) = attr_item.unsafety {
psess.dcx().emit_err(errors::InvalidAttrUnsafe {
span: unsafe_span,
name: attr_item.path.clone(),
});
}
}
}
// Called by `check_builtin_meta_item` and code that manually denies
// `unsafe(...)` in `cfg`
pub fn deny_builtin_meta_unsafety(features: &Features, psess: &ParseSess, meta: &MetaItem) {
// This only supports denying unsafety right now - making builtin attributes
// support unsafety will requite us to thread the actual `Attribute` through
// for the nice diagnostics.
if features.unsafe_attributes {
if let Safety::Unsafe(unsafe_span) = meta.unsafety {
psess
.dcx()
.emit_err(errors::InvalidAttrUnsafe { span: unsafe_span, name: meta.path.clone() });
}
}
}
pub fn check_builtin_meta_item(
features: &Features,
psess: &ParseSess,
meta: &MetaItem,
style: ast::AttrStyle,
name: Symbol,
template: AttributeTemplate,
deny_unsafety: bool,
) {
// Some special attributes like `cfg` must be checked
// before the generic check, so we skip them here.
@ -212,6 +244,10 @@ pub fn check_builtin_meta_item(
if !should_skip(name) && !is_attr_template_compatible(&template, &meta.kind) {
emit_malformed_attribute(psess, style, meta.span, name, template);
}
if deny_unsafety {
deny_builtin_meta_unsafety(features, psess, meta);
}
}
fn emit_malformed_attribute(

11
tests/ui/attributes/unsafe/derive-unsafe-attributes.rs
View File

@ -1,6 +1,15 @@
#![feature(unsafe_attributes)]
#[derive(unsafe(Debug))] //~ ERROR: traits in `#[derive(...)]` don't accept `unsafe(...)`
#[derive(unsafe(Debug))]
//~^ ERROR: expected identifier, found keyword `unsafe`
//~| ERROR: traits in `#[derive(...)]` don't accept arguments
//~| ERROR: expected identifier, found keyword `unsafe`
//~| ERROR: expected identifier, found keyword `unsafe`
//~| ERROR: cannot find derive macro `r#unsafe` in this scope
//~| ERROR: cannot find derive macro `r#unsafe` in this scope
struct Foo;
#[unsafe(derive(Debug))] //~ ERROR: is not an unsafe attribute
struct Bar;
fn main() {}

61
tests/ui/attributes/unsafe/derive-unsafe-attributes.stderr
View File

@ -1,8 +1,65 @@
error: traits in `#[derive(...)]` don't accept `unsafe(...)`
error: expected identifier, found keyword `unsafe`
--> $DIR/derive-unsafe-attributes.rs:3:10
|
LL | #[derive(unsafe(Debug))]
| ^^^^^^ expected identifier, found keyword
|
help: escape `unsafe` to use it as an identifier
|
LL | #[derive(r#unsafe(Debug))]
| ++
error: traits in `#[derive(...)]` don't accept arguments
--> $DIR/derive-unsafe-attributes.rs:3:16
|
LL | #[derive(unsafe(Debug))]
| ^^^^^^^ help: remove the arguments
error: `derive` is not an unsafe attribute
--> $DIR/derive-unsafe-attributes.rs:12:3
|
LL | #[unsafe(derive(Debug))]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: expected identifier, found keyword `unsafe`
--> $DIR/derive-unsafe-attributes.rs:3:10
|
LL | #[derive(unsafe(Debug))]
| ^^^^^^ expected identifier, found keyword
|
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
help: escape `unsafe` to use it as an identifier
|
LL | #[derive(r#unsafe(Debug))]
| ++
error: expected identifier, found keyword `unsafe`
--> $DIR/derive-unsafe-attributes.rs:3:10
|
LL | #[derive(unsafe(Debug))]
| ^^^^^^ expected identifier, found keyword
|
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
help: escape `unsafe` to use it as an identifier
|
LL | #[derive(r#unsafe(Debug))]
| ++
error: cannot find derive macro `r#unsafe` in this scope
--> $DIR/derive-unsafe-attributes.rs:3:10
|
LL | #[derive(unsafe(Debug))]
| ^^^^^^
error: aborting due to 1 previous error
error: cannot find derive macro `r#unsafe` in this scope
--> $DIR/derive-unsafe-attributes.rs:3:10
|
LL | #[derive(unsafe(Debug))]
| ^^^^^^
|
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: aborting due to 7 previous errors

2
tests/ui/attributes/unsafe/double-unsafe-attributes.stderr
View File

@ -13,7 +13,7 @@ error: `r#unsafe` is not an unsafe attribute
--> $DIR/double-unsafe-attributes.rs:3:3
|
LL | #[unsafe(unsafe(no_mangle))]
| ^^^^^^
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes

31
tests/ui/attributes/unsafe/extraneous-unsafe-attributes.rs Normal file
View File

@ -0,0 +1,31 @@
//@ edition: 2024
//@ compile-flags: -Zunstable-options
#![feature(unsafe_attributes)]
#[unsafe(cfg(any()))] //~ ERROR: is not an unsafe attribute
fn a() {}
#[unsafe(cfg_attr(any(), allow(dead_code)))] //~ ERROR: is not an unsafe attribute
fn b() {}
#[unsafe(test)] //~ ERROR: is not an unsafe attribute
fn aa() {}
#[unsafe(ignore = "test")] //~ ERROR: is not an unsafe attribute
fn bb() {}
#[unsafe(should_panic(expected = "test"))] //~ ERROR: is not an unsafe attribute
fn cc() {}
#[unsafe(macro_use)] //~ ERROR: is not an unsafe attribute
mod inner {
#[unsafe(macro_export)] //~ ERROR: is not an unsafe attribute
macro_rules! m {
() => {};
}
}
#[unsafe(used)] //~ ERROR: is not an unsafe attribute
static FOO: usize = 0;
fn main() {}

66
tests/ui/attributes/unsafe/extraneous-unsafe-attributes.stderr Normal file
View File

@ -0,0 +1,66 @@
error: `cfg` is not an unsafe attribute
--> $DIR/extraneous-unsafe-attributes.rs:5:3
|
LL | #[unsafe(cfg(any()))]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: `cfg_attr` is not an unsafe attribute
--> $DIR/extraneous-unsafe-attributes.rs:8:3
|
LL | #[unsafe(cfg_attr(any(), allow(dead_code)))]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: `test` is not an unsafe attribute
--> $DIR/extraneous-unsafe-attributes.rs:11:3
|
LL | #[unsafe(test)]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: `ignore` is not an unsafe attribute
--> $DIR/extraneous-unsafe-attributes.rs:14:3
|
LL | #[unsafe(ignore = "test")]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: `should_panic` is not an unsafe attribute
--> $DIR/extraneous-unsafe-attributes.rs:17:3
|
LL | #[unsafe(should_panic(expected = "test"))]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: `macro_use` is not an unsafe attribute
--> $DIR/extraneous-unsafe-attributes.rs:20:3
|
LL | #[unsafe(macro_use)]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: `macro_export` is not an unsafe attribute
--> $DIR/extraneous-unsafe-attributes.rs:22:7
|
LL | #[unsafe(macro_export)]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: `used` is not an unsafe attribute
--> $DIR/extraneous-unsafe-attributes.rs:28:3
|
LL | #[unsafe(used)]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: aborting due to 8 previous errors

37
tests/ui/attributes/unsafe/proc-unsafe-attributes.rs Normal file
View File

@ -0,0 +1,37 @@
#![feature(unsafe_attributes)]
#[unsafe(proc_macro)]
//~^ ERROR: is not an unsafe attribute
//~| ERROR attribute is only usable with crates of the `proc-macro` crate type
pub fn a() {}
#[unsafe(proc_macro_derive(Foo))]
//~^ ERROR: is not an unsafe attribute
//~| ERROR attribute is only usable with crates of the `proc-macro` crate type
pub fn b() {}
#[proc_macro_derive(unsafe(Foo))]
//~^ ERROR attribute is only usable with crates of the `proc-macro` crate type
//~| ERROR: expected identifier, found keyword `unsafe`
pub fn c() {}
#[unsafe(proc_macro_attribute)]
//~^ ERROR: is not an unsafe attribute
//~| ERROR attribute is only usable with crates of the `proc-macro` crate type
pub fn d() {}
#[unsafe(allow(dead_code))]
//~^ ERROR: is not an unsafe attribute
pub fn e() {}
#[unsafe(allow(unsafe(dead_code)))]
//~^ ERROR: is not an unsafe attribute
//~| ERROR: malformed lint attribute input
//~| ERROR: malformed lint attribute input
//~| ERROR: expected identifier, found keyword `unsafe`
//~| ERROR: malformed lint attribute input
//~| ERROR: malformed lint attribute input
pub fn f() {}
fn main() {}

119
tests/ui/attributes/unsafe/proc-unsafe-attributes.stderr Normal file
View File

@ -0,0 +1,119 @@
error[E0452]: malformed lint attribute input
--> $DIR/proc-unsafe-attributes.rs:28:16
|
LL | #[unsafe(allow(unsafe(dead_code)))]
| ^^^^^^^^^^^^^^^^^ bad attribute argument
error[E0452]: malformed lint attribute input
--> $DIR/proc-unsafe-attributes.rs:28:16
|
LL | #[unsafe(allow(unsafe(dead_code)))]
| ^^^^^^^^^^^^^^^^^ bad attribute argument
|
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `proc_macro` is not an unsafe attribute
--> $DIR/proc-unsafe-attributes.rs:3:3
|
LL | #[unsafe(proc_macro)]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: `proc_macro_derive` is not an unsafe attribute
--> $DIR/proc-unsafe-attributes.rs:9:3
|
LL | #[unsafe(proc_macro_derive(Foo))]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: expected identifier, found keyword `unsafe`
--> $DIR/proc-unsafe-attributes.rs:14:21
|
LL | #[proc_macro_derive(unsafe(Foo))]
| ^^^^^^ expected identifier, found keyword
|
help: escape `unsafe` to use it as an identifier
|
LL | #[proc_macro_derive(r#unsafe(Foo))]
| ++
error: `proc_macro_attribute` is not an unsafe attribute
--> $DIR/proc-unsafe-attributes.rs:19:3
|
LL | #[unsafe(proc_macro_attribute)]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: `allow` is not an unsafe attribute
--> $DIR/proc-unsafe-attributes.rs:24:3
|
LL | #[unsafe(allow(dead_code))]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: `allow` is not an unsafe attribute
--> $DIR/proc-unsafe-attributes.rs:28:3
|
LL | #[unsafe(allow(unsafe(dead_code)))]
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes
error: expected identifier, found keyword `unsafe`
--> $DIR/proc-unsafe-attributes.rs:28:16
|
LL | #[unsafe(allow(unsafe(dead_code)))]
| ^^^^^^ expected identifier, found keyword
|
help: escape `unsafe` to use it as an identifier
|
LL | #[unsafe(allow(r#unsafe(dead_code)))]
| ++
error: the `#[proc_macro]` attribute is only usable with crates of the `proc-macro` crate type
--> $DIR/proc-unsafe-attributes.rs:3:1
|
LL | #[unsafe(proc_macro)]
| ^^^^^^^^^^^^^^^^^^^^^
error: the `#[proc_macro_derive]` attribute is only usable with crates of the `proc-macro` crate type
--> $DIR/proc-unsafe-attributes.rs:9:1
|
LL | #[unsafe(proc_macro_derive(Foo))]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: the `#[proc_macro_derive]` attribute is only usable with crates of the `proc-macro` crate type
--> $DIR/proc-unsafe-attributes.rs:14:1
|
LL | #[proc_macro_derive(unsafe(Foo))]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: the `#[proc_macro_attribute]` attribute is only usable with crates of the `proc-macro` crate type
--> $DIR/proc-unsafe-attributes.rs:19:1
|
LL | #[unsafe(proc_macro_attribute)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0452]: malformed lint attribute input
--> $DIR/proc-unsafe-attributes.rs:28:16
|
LL | #[unsafe(allow(unsafe(dead_code)))]
| ^^^^^^^^^^^^^^^^^ bad attribute argument
|
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error[E0452]: malformed lint attribute input
--> $DIR/proc-unsafe-attributes.rs:28:16
|
LL | #[unsafe(allow(unsafe(dead_code)))]
| ^^^^^^^^^^^^^^^^^ bad attribute argument
|
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: aborting due to 15 previous errors
For more information about this error, try `rustc --explain E0452`.

6
tests/ui/attributes/unsafe/unsafe-attributes.rs
View File

@ -4,4 +4,10 @@
#[unsafe(no_mangle)]
fn a() {}
#[unsafe(export_name = "foo")]
fn b() {}
#[cfg_attr(any(), unsafe(no_mangle))]
static VAR2: u32 = 1;
fn main() {}

2
tests/ui/attributes/unsafe/unsafe-safe-attribute.stderr
View File

@ -2,7 +2,7 @@ error: `repr` is not an unsafe attribute
--> $DIR/unsafe-safe-attribute.rs:3:3
|
LL | #[unsafe(repr(C))]
| ^^^^^^
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes

2
tests/ui/attributes/unsafe/unsafe-safe-attribute_diagnostic.stderr
View File

@ -2,7 +2,7 @@ error: `diagnostic::on_unimplemented` is not an unsafe attribute
--> $DIR/unsafe-safe-attribute_diagnostic.rs:3:3
|
LL | #[unsafe(diagnostic::on_unimplemented(
| ^^^^^^
| ^^^^^^ this is not an unsafe attribute
|
= note: extraneous unsafe is not allowed in attributes