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Rollup merge of #128133 - nnethercote:fix-cfg_attr-spans, r=petrochenkov
Improve spans on evaluated `cfg_attr`s. When converting something like `#![cfg_attr(cond, attr)]` into `#![attr]`, we currently duplicate the `#` token and the `!` token. But weirdly, there is also this comment: // We don't really have a good span to use for the synthesized `[]` // in `#[attr]`, so just use the span of the `#` token. Maybe that comment used to be true? But now it is false: we can duplicate the existing delimiters (and their spans and spacing), much like we do for the `#` and `!`. This commit does that, thus removing the incorrect comment, and improving the spans on `Group`s in a few proc-macro tests. `@petrochenkov`
This commit is contained in:
Matthias Krüger
GitHub
commit
2dc88bf88a
@ -6,7 +6,7 @@ use crate::errors::{
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};
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use rustc_ast::ptr::P;
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use rustc_ast::token::{Delimiter, Token, TokenKind};
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use rustc_ast::tokenstream::{AttrTokenStream, AttrTokenTree, DelimSpacing, DelimSpan, Spacing};
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use rustc_ast::tokenstream::{AttrTokenStream, AttrTokenTree, Spacing};
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use rustc_ast::tokenstream::{LazyAttrTokenStream, TokenTree};
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use rustc_ast::NodeId;
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use rustc_ast::{self as ast, AttrStyle, Attribute, HasAttrs, HasTokens, MetaItem};
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@ -298,47 +298,47 @@ impl<'a> StripUnconfigured<'a> {
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cfg_attr: &Attribute,
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(item, item_span): (ast::AttrItem, Span),
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) -> Attribute {
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// We are taking an attribute of the form `#[cfg_attr(pred, attr)]`
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// and producing an attribute of the form `#[attr]`. We
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// have captured tokens for `attr` itself, but we need to
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// synthesize tokens for the wrapper `#` and `[]`, which
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// we do below.
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// Convert `#[cfg_attr(pred, attr)]` to `#[attr]`.
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// Use the `#` in `#[cfg_attr(pred, attr)]` as the `#` token
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// for `attr` when we expand it to `#[attr]`
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// Use the `#` from `#[cfg_attr(pred, attr)]` in the result `#[attr]`.
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let mut orig_trees = cfg_attr.token_trees().into_iter();
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let TokenTree::Token(pound_token @ Token { kind: TokenKind::Pound, .. }, _) =
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orig_trees.next().unwrap().clone()
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let Some(TokenTree::Token(pound_token @ Token { kind: TokenKind::Pound, .. }, _)) =
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orig_trees.next()
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else {
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panic!("Bad tokens for attribute {cfg_attr:?}");
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};
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// We don't really have a good span to use for the synthesized `[]`
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// in `#[attr]`, so just use the span of the `#` token.
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let bracket_group = AttrTokenTree::Delimited(
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DelimSpan::from_single(pound_token.span),
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DelimSpacing::new(Spacing::JointHidden, Spacing::Alone),
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Delimiter::Bracket,
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item.tokens
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.as_ref()
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.unwrap_or_else(|| panic!("Missing tokens for {item:?}"))
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.to_attr_token_stream(),
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);
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let trees = if cfg_attr.style == AttrStyle::Inner {
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// For inner attributes, we do the same thing for the `!` in `#![some_attr]`
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let TokenTree::Token(bang_token @ Token { kind: TokenKind::Not, .. }, _) =
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orig_trees.next().unwrap().clone()
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// For inner attributes, we do the same thing for the `!` in `#![attr]`.
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let mut trees = if cfg_attr.style == AttrStyle::Inner {
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let Some(TokenTree::Token(bang_token @ Token { kind: TokenKind::Not, .. }, _)) =
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orig_trees.next()
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else {
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panic!("Bad tokens for attribute {cfg_attr:?}");
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};
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vec![
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AttrTokenTree::Token(pound_token, Spacing::Joint),
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AttrTokenTree::Token(bang_token, Spacing::JointHidden),
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bracket_group,
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]
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} else {
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vec![AttrTokenTree::Token(pound_token, Spacing::JointHidden), bracket_group]
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vec![AttrTokenTree::Token(pound_token, Spacing::JointHidden)]
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};
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// And the same thing for the `[`/`]` delimiters in `#[attr]`.
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let Some(TokenTree::Delimited(delim_span, delim_spacing, Delimiter::Bracket, _)) =
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orig_trees.next()
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else {
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panic!("Bad tokens for attribute {cfg_attr:?}");
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};
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trees.push(AttrTokenTree::Delimited(
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delim_span,
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delim_spacing,
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Delimiter::Bracket,
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item.tokens
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.as_ref()
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.unwrap_or_else(|| panic!("Missing tokens for {item:?}"))
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.to_attr_token_stream(),
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));
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let tokens = Some(LazyAttrTokenStream::new(AttrTokenStream::new(trees)));
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let attr = attr::mk_attr_from_item(
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&self.sess.psess.attr_id_generator,
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@ -73,7 +73,7 @@ PRINT-ATTR INPUT (DEBUG): TokenStream [
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span: $DIR/cfg-eval-inner.rs:19:40: 19:54 (#0),
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},
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],
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span: $DIR/cfg-eval-inner.rs:19:5: 19:6 (#0),
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span: $DIR/cfg-eval-inner.rs:19:7: 19:56 (#0),
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},
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Punct {
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ch: '#',
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@ -168,7 +168,7 @@ PRINT-ATTR INPUT (DEBUG): TokenStream [
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span: $DIR/cfg-eval-inner.rs:23:48: 23:70 (#0),
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},
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],
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span: $DIR/cfg-eval-inner.rs:23:13: 23:14 (#0),
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span: $DIR/cfg-eval-inner.rs:23:15: 23:72 (#0),
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},
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Literal {
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kind: Integer,
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@ -233,7 +233,7 @@ PRINT-ATTR INPUT (DEBUG): TokenStream [
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span: $DIR/cfg-eval-inner.rs:32:40: 32:56 (#0),
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},
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],
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span: $DIR/cfg-eval-inner.rs:32:5: 32:6 (#0),
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span: $DIR/cfg-eval-inner.rs:32:7: 32:58 (#0),
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},
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Ident {
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ident: "fn",
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@ -60,7 +60,7 @@ PRINT-ATTR INPUT (DEBUG): TokenStream [
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span: $DIR/cfg-eval.rs:22:36: 22:38 (#0),
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},
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],
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span: $DIR/cfg-eval.rs:22:5: 22:6 (#0),
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span: $DIR/cfg-eval.rs:22:6: 22:40 (#0),
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},
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Ident {
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ident: "field_true",
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@ -99,7 +99,7 @@ PRINT-ATTR INPUT (DEBUG): TokenStream [
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span: $DIR/cfg-eval.rs:35:62: 35:73 (#0),
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},
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],
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span: $DIR/cfg-eval.rs:35:39: 35:40 (#0),
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span: $DIR/cfg-eval.rs:35:40: 35:75 (#0),
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},
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Group {
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delimiter: Parenthesis,
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@ -57,7 +57,7 @@ PRINT-DERIVE INPUT (DEBUG): TokenStream [
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span: $DIR/expand-to-derive.rs:27:28: 27:39 (#0),
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},
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],
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span: $DIR/expand-to-derive.rs:27:5: 27:6 (#0),
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span: $DIR/expand-to-derive.rs:27:6: 27:41 (#0),
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},
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Ident {
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ident: "struct",
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@ -674,7 +674,7 @@ PRINT-DERIVE INPUT (DEBUG): TokenStream [
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span: $DIR/inner-attrs.rs:41:52: 41:59 (#0),
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},
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],
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span: $DIR/inner-attrs.rs:41:17: 41:18 (#0),
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span: $DIR/inner-attrs.rs:41:19: 41:61 (#0),
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},
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Ident {
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ident: "true",
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@ -119,7 +119,7 @@ PRINT-ATTR INPUT (DEBUG): TokenStream [
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span: $DIR/issue-75930-derive-cfg.rs:50:29: 50:40 (#0),
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},
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],
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span: $DIR/issue-75930-derive-cfg.rs:50:1: 50:2 (#0),
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span: $DIR/issue-75930-derive-cfg.rs:50:2: 50:42 (#0),
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},
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Punct {
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ch: '#',
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@ -1395,7 +1395,7 @@ PRINT-DERIVE INPUT (DEBUG): TokenStream [
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span: $DIR/issue-75930-derive-cfg.rs:50:29: 50:40 (#0),
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},
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],
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span: $DIR/issue-75930-derive-cfg.rs:50:1: 50:2 (#0),
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span: $DIR/issue-75930-derive-cfg.rs:50:2: 50:42 (#0),
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},
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Punct {
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ch: '#',
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@ -1571,7 +1571,7 @@ PRINT-DERIVE INPUT (DEBUG): TokenStream [
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span: $DIR/issue-75930-derive-cfg.rs:63:41: 63:51 (#0),
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},
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],
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span: $DIR/issue-75930-derive-cfg.rs:63:13: 63:14 (#0),
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span: $DIR/issue-75930-derive-cfg.rs:63:14: 63:53 (#0),
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},
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Ident {
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ident: "false",
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@ -88,7 +88,7 @@ PRINT-DERIVE INPUT (DEBUG): TokenStream [
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span: $DIR/macro-rules-derive-cfg.rs:19:59: 19:66 (#3),
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},
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],
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span: $DIR/macro-rules-derive-cfg.rs:19:25: 19:26 (#3),
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span: $DIR/macro-rules-derive-cfg.rs:19:26: 19:68 (#3),
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},
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Punct {
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ch: '#',
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@ -113,7 +113,7 @@ PRINT-DERIVE INPUT (DEBUG): TokenStream [
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span: $DIR/macro-rules-derive-cfg.rs:26:47: 26:55 (#0),
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},
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],
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span: $DIR/macro-rules-derive-cfg.rs:26:13: 26:14 (#0),
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span: $DIR/macro-rules-derive-cfg.rs:26:14: 26:57 (#0),
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},
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Group {
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delimiter: Brace,
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@ -146,7 +146,7 @@ PRINT-DERIVE INPUT (DEBUG): TokenStream [
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span: $DIR/macro-rules-derive-cfg.rs:27:34: 27:42 (#0),
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},
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],
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span: $DIR/macro-rules-derive-cfg.rs:27:5: 27:6 (#0),
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span: $DIR/macro-rules-derive-cfg.rs:27:7: 27:44 (#0),
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},
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Literal {
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kind: Integer,
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