mikros/rust
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Use cfg_attr as a name more.

Browse Source 
In various functions where the attribute being processed is known to be
a `#[cfg_attr(...)]` attribute. I find this a helpful reminder.
This commit is contained in:
Nicholas Nethercote 2024-07-10 15:11:57 +10:00
parent fee152556f
commit d8b6aa6d0d
2 changed files with 14 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
compiler/rustc_expand/src/config.rs
View File

@ -253,9 +253,9 @@ fn process_cfg_attr(&self, attr: &Attribute) -> Vec<Attribute> {
/// Gives a compiler warning when the `cfg_attr` contains no attributes and
/// 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, attr: &Attribute, recursive: bool) -> Vec<Attribute> {
pub(crate) fn expand_cfg_attr(&self, cfg_attr: &Attribute, recursive: bool) -> Vec<Attribute> {
let Some((cfg_predicate, expanded_attrs)) =
rustc_parse::parse_cfg_attr(attr, &self.sess.psess)
rustc_parse::parse_cfg_attr(cfg_attr, &self.sess.psess)
else {
return vec![];
};
@ -264,7 +264,7 @@ pub(crate) fn expand_cfg_attr(&self, attr: &Attribute, recursive: bool) -> Vec<A
if expanded_attrs.is_empty() {
self.sess.psess.buffer_lint(
rustc_lint_defs::builtin::UNUSED_ATTRIBUTES,
attr.span,
cfg_attr.span,
ast::CRATE_NODE_ID,
BuiltinLintDiag::CfgAttrNoAttributes,
);
@ -280,16 +280,16 @@ pub(crate) fn expand_cfg_attr(&self, attr: &Attribute, recursive: bool) -> Vec<A
// `#[cfg_attr(false, cfg_attr(true, some_attr))]`.
expanded_attrs
.into_iter()
.flat_map(|item| self.process_cfg_attr(&self.expand_cfg_attr_item(attr, item)))
.flat_map(|item| self.process_cfg_attr(&self.expand_cfg_attr_item(cfg_attr, item)))
.collect()
} else {
expanded_attrs.into_iter().map(|item| self.expand_cfg_attr_item(attr, item)).collect()
expanded_attrs.into_iter().map(|item| self.expand_cfg_attr_item(cfg_attr, item)).collect()
}
}
fn expand_cfg_attr_item(
&self,
attr: &Attribute,
cfg_attr: &Attribute,
(item, item_span): (ast::AttrItem, Span),
) -> Attribute {
// We are taking an attribute of the form `#[cfg_attr(pred, attr)]`
@ -300,11 +300,11 @@ fn expand_cfg_attr_item(
// Use the `#` in `#[cfg_attr(pred, attr)]` as the `#` token
// for `attr` when we expand it to `#[attr]`
let mut orig_trees = attr.token_trees().into_iter();
let mut orig_trees = cfg_attr.token_trees().into_iter();
let TokenTree::Token(pound_token @ Token { kind: TokenKind::Pound, .. }, _) =
orig_trees.next().unwrap().clone()
else {
panic!("Bad tokens for attribute {attr:?}");
panic!("Bad tokens for attribute {cfg_attr:?}");
};
// We don't really have a good span to use for the synthesized `[]`
@ -318,12 +318,12 @@ fn expand_cfg_attr_item(
.unwrap_or_else(|| panic!("Missing tokens for {item:?}"))
.to_attr_token_stream(),
);
let trees = if attr.style == AttrStyle::Inner {
let trees = if cfg_attr.style == AttrStyle::Inner {
// For inner attributes, we do the same thing for the `!` in `#![some_attr]`
let TokenTree::Token(bang_token @ Token { kind: TokenKind::Not, .. }, _) =
orig_trees.next().unwrap().clone()
else {
panic!("Bad tokens for attribute {attr:?}");
panic!("Bad tokens for attribute {cfg_attr:?}");
};
vec![
AttrTokenTree::Token(pound_token, Spacing::Joint),
@ -338,7 +338,7 @@ fn expand_cfg_attr_item(
&self.sess.psess.attr_id_generator,
item,
tokens,
attr.style,
cfg_attr.style,
item_span,
);
if attr.has_name(sym::crate_type) {

6
compiler/rustc_parse/src/lib.rs
View File

@ -157,14 +157,14 @@ pub fn fake_token_stream_for_crate(psess: &ParseSess, krate: &ast::Crate) -> Tok
}
pub fn parse_cfg_attr(
attr: &Attribute,
cfg_attr: &Attribute,
psess: &ParseSess,
) -> Option<(MetaItem, Vec<(AttrItem, Span)>)> {
const CFG_ATTR_GRAMMAR_HELP: &str = "#[cfg_attr(condition, attribute, other_attribute, ...)]";
const CFG_ATTR_NOTE_REF: &str = "for more information, visit \
<https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute>";
match attr.get_normal_item().args {
match cfg_attr.get_normal_item().args {
ast::AttrArgs::Delimited(ast::DelimArgs { dspan, delim, ref tokens })
if !tokens.is_empty() =>
{
@ -180,7 +180,7 @@ pub fn parse_cfg_attr(
}
_ => {
psess.dcx().emit_err(errors::MalformedCfgAttr {
span: attr.span,
span: cfg_attr.span,
sugg: CFG_ATTR_GRAMMAR_HELP,
});
}