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316bc1c67c
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\asm.rs:306:28
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306 | fn err_duplicate_option(p: &mut Parser<'_>, symbol: Symbol, span: Span) {
| ^^^^^^^^^^^^^^^ help: consider changing to: `&Parser<'_>`
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= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\asm.rs:318:8
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318 | p: &mut Parser<'a>,
| ^^^^^^^^^^^^^^^ help: consider changing to: `&Parser<'a>`
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= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\assert.rs:114:25
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114 | fn parse_assert<'a>(cx: &mut ExtCtxt<'a>, sp: Span, stream: TokenStream) -> PResult<'a, Assert> {
| ^^^^^^^^^^^^^^^^ help: consider changing to: `&ExtCtxt<'a>`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\asm.rs:32:10
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32 | ecx: &mut ExtCtxt<'a>,
| ^^^^^^^^^^^^^^^^ help: consider changing to: `&ExtCtxt<'a>`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\test.rs:99:9
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99 | cx: &mut ExtCtxt<'_>,
| ^^^^^^^^^^^^^^^^ help: consider changing to: `&ExtCtxt<'_>`
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= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\source_util.rs:237:9
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237 | cx: &mut ExtCtxt<'_>,
| ^^^^^^^^^^^^^^^^ help: consider changing to: `&ExtCtxt<'_>`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\format.rs:809:10
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809 | ecx: &mut ExtCtxt<'_>,
| ^^^^^^^^^^^^^^^^ help: consider changing to: `&ExtCtxt<'_>`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\format.rs:737:10
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737 | ecx: &mut ExtCtxt<'a>,
| ^^^^^^^^^^^^^^^^ help: consider changing to: `&ExtCtxt<'a>`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\format.rs:68:24
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68 | fn parse_args<'a>(ecx: &mut ExtCtxt<'a>, sp: Span, tts: TokenStream) -> PResult<'a, MacroInput> {
| ^^^^^^^^^^^^^^^^ help: consider changing to: `&ExtCtxt<'a>`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\format.rs:607:10
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607 | ecx: &mut ExtCtxt<'_>,
| ^^^^^^^^^^^^^^^^ help: consider changing to: `&ExtCtxt<'_>`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\edition_panic.rs:43:9
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43 | cx: &'cx mut ExtCtxt<'_>,
| ^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&ExtCtxt<'_>`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\concat_bytes.rs:11:9
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11 | cx: &mut ExtCtxt<'_>,
| ^^^^^^^^^^^^^^^^ help: consider changing to: `&ExtCtxt<'_>`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\cfg.rs:38:22
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38 | fn parse_cfg<'a>(cx: &mut ExtCtxt<'a>, span: Span, tts: TokenStream) -> PResult<'a, ast::MetaItem> {
| ^^^^^^^^^^^^^^^^ help: consider changing to: `&ExtCtxt<'a>`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_builtin_macros\src\cfg_accessible.rs:13:28
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13 | fn validate_input<'a>(ecx: &mut ExtCtxt<'_>, mi: &'a ast::MetaItem) -> Option<&'a ast::Path> {
| ^^^^^^^^^^^^^^^^ help: consider changing to: `&ExtCtxt<'_>`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
71 lines
2.2 KiB
Rust
71 lines
2.2 KiB
Rust
//! Implementation of the `#[cfg_accessible(path)]` attribute macro.
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use crate::errors;
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use rustc_ast as ast;
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use rustc_expand::base::{Annotatable, ExpandResult, ExtCtxt, Indeterminate, MultiItemModifier};
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use rustc_feature::AttributeTemplate;
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use rustc_parse::validate_attr;
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use rustc_span::symbol::sym;
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use rustc_span::Span;
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pub(crate) struct Expander;
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fn validate_input<'a>(ecx: &ExtCtxt<'_>, mi: &'a ast::MetaItem) -> Option<&'a ast::Path> {
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use errors::CfgAccessibleInvalid::*;
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match mi.meta_item_list() {
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None => {}
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Some([]) => {
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ecx.dcx().emit_err(UnspecifiedPath(mi.span));
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}
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Some([_, .., l]) => {
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ecx.dcx().emit_err(MultiplePaths(l.span()));
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}
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Some([nmi]) => match nmi.meta_item() {
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None => {
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ecx.dcx().emit_err(LiteralPath(nmi.span()));
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}
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Some(mi) => {
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if !mi.is_word() {
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ecx.dcx().emit_err(HasArguments(mi.span));
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}
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return Some(&mi.path);
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}
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},
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}
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None
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}
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impl MultiItemModifier for Expander {
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fn expand(
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&self,
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ecx: &mut ExtCtxt<'_>,
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span: Span,
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meta_item: &ast::MetaItem,
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item: Annotatable,
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_is_derive_const: bool,
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) -> ExpandResult<Vec<Annotatable>, Annotatable> {
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let template = AttributeTemplate { list: Some("path"), ..Default::default() };
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validate_attr::check_builtin_meta_item(
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&ecx.sess.psess,
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meta_item,
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ast::AttrStyle::Outer,
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sym::cfg_accessible,
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template,
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);
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let Some(path) = validate_input(ecx, meta_item) else {
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return ExpandResult::Ready(Vec::new());
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};
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match ecx.resolver.cfg_accessible(ecx.current_expansion.id, path) {
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Ok(true) => ExpandResult::Ready(vec![item]),
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Ok(false) => ExpandResult::Ready(Vec::new()),
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Err(Indeterminate) if ecx.force_mode => {
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ecx.dcx().emit_err(errors::CfgAccessibleIndeterminate { span });
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ExpandResult::Ready(vec![item])
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}
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Err(Indeterminate) => ExpandResult::Retry(item),
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}
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}
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}
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