1 use crate::base::{ExtCtxt, ResolverExpand};
4 use rustc_ast::token::{self, Nonterminal, NtIdent, TokenKind};
5 use rustc_ast::tokenstream::{self, CanSynthesizeMissingTokens};
6 use rustc_ast::tokenstream::{DelimSpan, Spacing::*, TokenStream, TreeAndSpacing};
7 use rustc_ast_pretty::pprust;
8 use rustc_data_structures::fx::FxHashMap;
9 use rustc_data_structures::sync::Lrc;
10 use rustc_errors::Diagnostic;
11 use rustc_lint_defs::builtin::PROC_MACRO_BACK_COMPAT;
12 use rustc_lint_defs::BuiltinLintDiagnostics;
13 use rustc_parse::lexer::nfc_normalize;
14 use rustc_parse::{nt_to_tokenstream, parse_stream_from_source_str};
15 use rustc_session::parse::ParseSess;
16 use rustc_span::def_id::CrateNum;
17 use rustc_span::hygiene::ExpnKind;
18 use rustc_span::symbol::{self, kw, sym, Symbol};
19 use rustc_span::{BytePos, FileName, MultiSpan, Pos, RealFileName, SourceFile, Span};
21 use pm::bridge::{server, TokenTree};
22 use pm::{Delimiter, Level, LineColumn, Spacing};
24 use std::{ascii, panic};
26 trait FromInternal<T> {
27 fn from_internal(x: T) -> Self;
31 fn to_internal(self) -> T;
34 impl FromInternal<token::DelimToken> for Delimiter {
35 fn from_internal(delim: token::DelimToken) -> Delimiter {
37 token::Paren => Delimiter::Parenthesis,
38 token::Brace => Delimiter::Brace,
39 token::Bracket => Delimiter::Bracket,
40 token::NoDelim => Delimiter::None,
45 impl ToInternal<token::DelimToken> for Delimiter {
46 fn to_internal(self) -> token::DelimToken {
48 Delimiter::Parenthesis => token::Paren,
49 Delimiter::Brace => token::Brace,
50 Delimiter::Bracket => token::Bracket,
51 Delimiter::None => token::NoDelim,
56 impl FromInternal<(TreeAndSpacing, &'_ mut Vec<Self>, &mut Rustc<'_>)>
57 for TokenTree<Group, Punct, Ident, Literal>
60 ((tree, spacing), stack, rustc): (TreeAndSpacing, &mut Vec<Self>, &mut Rustc<'_>),
62 use rustc_ast::token::*;
64 let joint = spacing == Joint;
65 let Token { kind, span } = match tree {
66 tokenstream::TokenTree::Delimited(span, delim, tts) => {
67 let delimiter = Delimiter::from_internal(delim);
68 return TokenTree::Group(Group { delimiter, stream: tts, span, flatten: false });
70 tokenstream::TokenTree::Token(token) => token,
74 ($ty:ident { $($field:ident $(: $value:expr)*),+ $(,)? }) => (
75 TokenTree::$ty(self::$ty {
76 $($field $(: $value)*,)+
80 ($ty:ident::$method:ident($($value:expr),*)) => (
81 TokenTree::$ty(self::$ty::$method($($value,)* span))
86 tt!(Punct::new($a, joint))
88 ($a:expr, $b:expr) => {{
89 stack.push(tt!(Punct::new($b, joint)));
90 tt!(Punct::new($a, true))
92 ($a:expr, $b:expr, $c:expr) => {{
93 stack.push(tt!(Punct::new($c, joint)));
94 stack.push(tt!(Punct::new($b, true)));
95 tt!(Punct::new($a, true))
103 EqEq => op!('=', '='),
107 AndAnd => op!('&', '&'),
108 OrOr => op!('|', '|'),
111 BinOp(Plus) => op!('+'),
112 BinOp(Minus) => op!('-'),
113 BinOp(Star) => op!('*'),
114 BinOp(Slash) => op!('/'),
115 BinOp(Percent) => op!('%'),
116 BinOp(Caret) => op!('^'),
117 BinOp(And) => op!('&'),
118 BinOp(Or) => op!('|'),
119 BinOp(Shl) => op!('<', '<'),
120 BinOp(Shr) => op!('>', '>'),
121 BinOpEq(Plus) => op!('+', '='),
122 BinOpEq(Minus) => op!('-', '='),
123 BinOpEq(Star) => op!('*', '='),
124 BinOpEq(Slash) => op!('/', '='),
125 BinOpEq(Percent) => op!('%', '='),
126 BinOpEq(Caret) => op!('^', '='),
127 BinOpEq(And) => op!('&', '='),
128 BinOpEq(Or) => op!('|', '='),
129 BinOpEq(Shl) => op!('<', '<', '='),
130 BinOpEq(Shr) => op!('>', '>', '='),
133 DotDot => op!('.', '.'),
134 DotDotDot => op!('.', '.', '.'),
135 DotDotEq => op!('.', '.', '='),
139 ModSep => op!(':', ':'),
140 RArrow => op!('-', '>'),
141 LArrow => op!('<', '-'),
142 FatArrow => op!('=', '>'),
145 Question => op!('?'),
146 SingleQuote => op!('\''),
148 Ident(name, false) if name == kw::DollarCrate => tt!(Ident::dollar_crate()),
149 Ident(name, is_raw) => tt!(Ident::new(rustc.sess, name, is_raw)),
151 let ident = symbol::Ident::new(name, span).without_first_quote();
152 stack.push(tt!(Ident::new(rustc.sess, ident.name, false)));
153 tt!(Punct::new('\'', true))
155 Literal(lit) => tt!(Literal { lit }),
156 DocComment(_, attr_style, data) => {
157 let mut escaped = String::new();
158 for ch in data.as_str().chars() {
159 escaped.extend(ch.escape_debug());
162 Ident(sym::doc, false),
164 TokenKind::lit(token::Str, Symbol::intern(&escaped), None),
167 .map(|kind| tokenstream::TokenTree::token(kind, span))
169 stack.push(TokenTree::Group(Group {
170 delimiter: Delimiter::Bracket,
172 span: DelimSpan::from_single(span),
175 if attr_style == ast::AttrStyle::Inner {
176 stack.push(tt!(Punct::new('!', false)));
178 tt!(Punct::new('#', false))
181 Interpolated(nt) => {
182 if let Some((name, is_raw)) = ident_name_compatibility_hack(&nt, span, rustc) {
183 TokenTree::Ident(Ident::new(rustc.sess, name.name, is_raw, name.span))
185 let stream = nt_to_tokenstream(&nt, rustc.sess, CanSynthesizeMissingTokens::No);
186 TokenTree::Group(Group {
187 delimiter: Delimiter::None,
189 span: DelimSpan::from_single(span),
190 flatten: crate::base::pretty_printing_compatibility_hack(&nt, rustc.sess),
195 OpenDelim(..) | CloseDelim(..) => unreachable!(),
196 Eof => unreachable!(),
201 impl ToInternal<TokenStream> for TokenTree<Group, Punct, Ident, Literal> {
202 fn to_internal(self) -> TokenStream {
203 use rustc_ast::token::*;
205 let (ch, joint, span) = match self {
206 TokenTree::Punct(Punct { ch, joint, span }) => (ch, joint, span),
207 TokenTree::Group(Group { delimiter, stream, span, .. }) => {
208 return tokenstream::TokenTree::Delimited(span, delimiter.to_internal(), stream)
211 TokenTree::Ident(self::Ident { sym, is_raw, span }) => {
212 return tokenstream::TokenTree::token(Ident(sym, is_raw), span).into();
214 TokenTree::Literal(self::Literal {
215 lit: token::Lit { kind: token::Integer, symbol, suffix },
217 }) if symbol.as_str().starts_with('-') => {
218 let minus = BinOp(BinOpToken::Minus);
219 let symbol = Symbol::intern(&symbol.as_str()[1..]);
220 let integer = TokenKind::lit(token::Integer, symbol, suffix);
221 let a = tokenstream::TokenTree::token(minus, span);
222 let b = tokenstream::TokenTree::token(integer, span);
223 return vec![a, b].into_iter().collect();
225 TokenTree::Literal(self::Literal {
226 lit: token::Lit { kind: token::Float, symbol, suffix },
228 }) if symbol.as_str().starts_with('-') => {
229 let minus = BinOp(BinOpToken::Minus);
230 let symbol = Symbol::intern(&symbol.as_str()[1..]);
231 let float = TokenKind::lit(token::Float, symbol, suffix);
232 let a = tokenstream::TokenTree::token(minus, span);
233 let b = tokenstream::TokenTree::token(float, span);
234 return vec![a, b].into_iter().collect();
236 TokenTree::Literal(self::Literal { lit, span }) => {
237 return tokenstream::TokenTree::token(Literal(lit), span).into();
241 let kind = match ch {
251 '%' => BinOp(Percent),
267 let tree = tokenstream::TokenTree::token(kind, span);
268 TokenStream::new(vec![(tree, if joint { Joint } else { Alone })])
272 impl ToInternal<rustc_errors::Level> for Level {
273 fn to_internal(self) -> rustc_errors::Level {
275 Level::Error => rustc_errors::Level::Error,
276 Level::Warning => rustc_errors::Level::Warning,
277 Level::Note => rustc_errors::Level::Note,
278 Level::Help => rustc_errors::Level::Help,
279 _ => unreachable!("unknown proc_macro::Level variant: {:?}", self),
284 pub struct FreeFunctions;
287 pub struct TokenStreamIter {
288 cursor: tokenstream::Cursor,
289 stack: Vec<TokenTree<Group, Punct, Ident, Literal>>,
294 delimiter: Delimiter,
297 /// A hack used to pass AST fragments to attribute and derive macros
298 /// as a single nonterminal token instead of a token stream.
299 /// FIXME: It needs to be removed, but there are some compatibility issues (see #73345).
303 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
306 // NB. not using `Spacing` here because it doesn't implement `Hash`.
312 fn new(ch: char, joint: bool, span: Span) -> Punct {
313 const LEGAL_CHARS: &[char] = &[
314 '=', '<', '>', '!', '~', '+', '-', '*', '/', '%', '^', '&', '|', '@', '.', ',', ';',
315 ':', '#', '$', '?', '\'',
317 if !LEGAL_CHARS.contains(&ch) {
318 panic!("unsupported character `{:?}`", ch)
320 Punct { ch, joint, span }
324 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
332 fn new(sess: &ParseSess, sym: Symbol, is_raw: bool, span: Span) -> Ident {
333 let sym = nfc_normalize(&sym.as_str());
334 let string = sym.as_str();
335 if !rustc_lexer::is_ident(&string) {
336 panic!("`{:?}` is not a valid identifier", string)
338 if is_raw && !sym.can_be_raw() {
339 panic!("`{}` cannot be a raw identifier", string);
341 sess.symbol_gallery.insert(sym, span);
342 Ident { sym, is_raw, span }
344 fn dollar_crate(span: Span) -> Ident {
345 // `$crate` is accepted as an ident only if it comes from the compiler.
346 Ident { sym: kw::DollarCrate, is_raw: false, span }
350 // FIXME(eddyb) `Literal` should not expose internal `Debug` impls.
351 #[derive(Clone, Debug)]
357 pub(crate) struct Rustc<'a> {
358 resolver: &'a dyn ResolverExpand,
365 rebased_spans: FxHashMap<usize, Span>,
369 pub fn new(cx: &'a ExtCtxt<'_>) -> Self {
370 let expn_data = cx.current_expansion.id.expn_data();
372 resolver: cx.resolver,
373 sess: cx.parse_sess(),
374 def_site: cx.with_def_site_ctxt(expn_data.def_site),
375 call_site: cx.with_call_site_ctxt(expn_data.call_site),
376 mixed_site: cx.with_mixed_site_ctxt(expn_data.call_site),
377 span_debug: cx.ecfg.span_debug,
378 krate: expn_data.macro_def_id.unwrap().krate,
379 rebased_spans: FxHashMap::default(),
383 fn lit(&mut self, kind: token::LitKind, symbol: Symbol, suffix: Option<Symbol>) -> Literal {
384 Literal { lit: token::Lit::new(kind, symbol, suffix), span: server::Span::call_site(self) }
388 impl server::Types for Rustc<'_> {
389 type FreeFunctions = FreeFunctions;
390 type TokenStream = TokenStream;
391 type TokenStreamBuilder = tokenstream::TokenStreamBuilder;
392 type TokenStreamIter = TokenStreamIter;
396 type Literal = Literal;
397 type SourceFile = Lrc<SourceFile>;
398 type MultiSpan = Vec<Span>;
399 type Diagnostic = Diagnostic;
403 impl server::FreeFunctions for Rustc<'_> {
404 fn track_env_var(&mut self, var: &str, value: Option<&str>) {
405 self.sess.env_depinfo.borrow_mut().insert((Symbol::intern(var), value.map(Symbol::intern)));
408 fn track_path(&mut self, path: &str) {
409 self.sess.file_depinfo.borrow_mut().insert(Symbol::intern(path));
413 impl server::TokenStream for Rustc<'_> {
414 fn new(&mut self) -> Self::TokenStream {
415 TokenStream::default()
417 fn is_empty(&mut self, stream: &Self::TokenStream) -> bool {
420 fn from_str(&mut self, src: &str) -> Self::TokenStream {
421 parse_stream_from_source_str(
422 FileName::proc_macro_source_code(src),
425 Some(self.call_site),
428 fn to_string(&mut self, stream: &Self::TokenStream) -> String {
429 pprust::tts_to_string(stream)
433 tree: TokenTree<Self::Group, Self::Punct, Self::Ident, Self::Literal>,
434 ) -> Self::TokenStream {
437 fn into_iter(&mut self, stream: Self::TokenStream) -> Self::TokenStreamIter {
438 TokenStreamIter { cursor: stream.trees(), stack: vec![] }
442 impl server::TokenStreamBuilder for Rustc<'_> {
443 fn new(&mut self) -> Self::TokenStreamBuilder {
444 tokenstream::TokenStreamBuilder::new()
446 fn push(&mut self, builder: &mut Self::TokenStreamBuilder, stream: Self::TokenStream) {
447 builder.push(stream);
449 fn build(&mut self, builder: Self::TokenStreamBuilder) -> Self::TokenStream {
454 impl server::TokenStreamIter for Rustc<'_> {
457 iter: &mut Self::TokenStreamIter,
458 ) -> Option<TokenTree<Self::Group, Self::Punct, Self::Ident, Self::Literal>> {
460 let tree = iter.stack.pop().or_else(|| {
461 let next = iter.cursor.next_with_spacing()?;
462 Some(TokenTree::from_internal((next, &mut iter.stack, self)))
464 // A hack used to pass AST fragments to attribute and derive macros
465 // as a single nonterminal token instead of a token stream.
466 // Such token needs to be "unwrapped" and not represented as a delimited group.
467 // FIXME: It needs to be removed, but there are some compatibility issues (see #73345).
468 if let TokenTree::Group(ref group) = tree {
470 iter.cursor.append(group.stream.clone());
479 impl server::Group for Rustc<'_> {
480 fn new(&mut self, delimiter: Delimiter, stream: Self::TokenStream) -> Self::Group {
484 span: DelimSpan::from_single(server::Span::call_site(self)),
488 fn delimiter(&mut self, group: &Self::Group) -> Delimiter {
491 fn stream(&mut self, group: &Self::Group) -> Self::TokenStream {
494 fn span(&mut self, group: &Self::Group) -> Self::Span {
497 fn span_open(&mut self, group: &Self::Group) -> Self::Span {
500 fn span_close(&mut self, group: &Self::Group) -> Self::Span {
503 fn set_span(&mut self, group: &mut Self::Group, span: Self::Span) {
504 group.span = DelimSpan::from_single(span);
508 impl server::Punct for Rustc<'_> {
509 fn new(&mut self, ch: char, spacing: Spacing) -> Self::Punct {
510 Punct::new(ch, spacing == Spacing::Joint, server::Span::call_site(self))
512 fn as_char(&mut self, punct: Self::Punct) -> char {
515 fn spacing(&mut self, punct: Self::Punct) -> Spacing {
516 if punct.joint { Spacing::Joint } else { Spacing::Alone }
518 fn span(&mut self, punct: Self::Punct) -> Self::Span {
521 fn with_span(&mut self, punct: Self::Punct, span: Self::Span) -> Self::Punct {
522 Punct { span, ..punct }
526 impl server::Ident for Rustc<'_> {
527 fn new(&mut self, string: &str, span: Self::Span, is_raw: bool) -> Self::Ident {
528 Ident::new(self.sess, Symbol::intern(string), is_raw, span)
530 fn span(&mut self, ident: Self::Ident) -> Self::Span {
533 fn with_span(&mut self, ident: Self::Ident, span: Self::Span) -> Self::Ident {
534 Ident { span, ..ident }
538 impl server::Literal for Rustc<'_> {
539 fn from_str(&mut self, s: &str) -> Result<Self::Literal, ()> {
540 let override_span = None;
541 let stream = parse_stream_from_source_str(
542 FileName::proc_macro_source_code(s),
547 if stream.len() != 1 {
550 let tree = stream.into_trees().next().unwrap();
551 let token = match tree {
552 tokenstream::TokenTree::Token(token) => token,
553 tokenstream::TokenTree::Delimited { .. } => return Err(()),
555 let span_data = token.span.data();
556 if (span_data.hi.0 - span_data.lo.0) as usize != s.len() {
557 // There is a comment or whitespace adjacent to the literal.
560 let lit = match token.kind {
561 TokenKind::Literal(lit) => lit,
564 Ok(Literal { lit, span: self.call_site })
566 fn debug_kind(&mut self, literal: &Self::Literal) -> String {
567 format!("{:?}", literal.lit.kind)
569 fn symbol(&mut self, literal: &Self::Literal) -> String {
570 literal.lit.symbol.to_string()
572 fn suffix(&mut self, literal: &Self::Literal) -> Option<String> {
573 literal.lit.suffix.as_ref().map(Symbol::to_string)
575 fn integer(&mut self, n: &str) -> Self::Literal {
576 self.lit(token::Integer, Symbol::intern(n), None)
578 fn typed_integer(&mut self, n: &str, kind: &str) -> Self::Literal {
579 self.lit(token::Integer, Symbol::intern(n), Some(Symbol::intern(kind)))
581 fn float(&mut self, n: &str) -> Self::Literal {
582 self.lit(token::Float, Symbol::intern(n), None)
584 fn f32(&mut self, n: &str) -> Self::Literal {
585 self.lit(token::Float, Symbol::intern(n), Some(sym::f32))
587 fn f64(&mut self, n: &str) -> Self::Literal {
588 self.lit(token::Float, Symbol::intern(n), Some(sym::f64))
590 fn string(&mut self, string: &str) -> Self::Literal {
591 let mut escaped = String::new();
592 for ch in string.chars() {
593 escaped.extend(ch.escape_debug());
595 self.lit(token::Str, Symbol::intern(&escaped), None)
597 fn character(&mut self, ch: char) -> Self::Literal {
598 let mut escaped = String::new();
599 escaped.extend(ch.escape_unicode());
600 self.lit(token::Char, Symbol::intern(&escaped), None)
602 fn byte_string(&mut self, bytes: &[u8]) -> Self::Literal {
606 .flat_map(ascii::escape_default)
607 .map(Into::<char>::into)
608 .collect::<String>();
609 self.lit(token::ByteStr, Symbol::intern(&string), None)
611 fn span(&mut self, literal: &Self::Literal) -> Self::Span {
614 fn set_span(&mut self, literal: &mut Self::Literal, span: Self::Span) {
619 literal: &Self::Literal,
622 ) -> Option<Self::Span> {
623 let span = literal.span;
624 let length = span.hi().to_usize() - span.lo().to_usize();
626 let start = match start {
627 Bound::Included(lo) => lo,
628 Bound::Excluded(lo) => lo.checked_add(1)?,
629 Bound::Unbounded => 0,
632 let end = match end {
633 Bound::Included(hi) => hi.checked_add(1)?,
634 Bound::Excluded(hi) => hi,
635 Bound::Unbounded => length,
638 // Bounds check the values, preventing addition overflow and OOB spans.
639 if start > u32::MAX as usize
640 || end > u32::MAX as usize
641 || (u32::MAX - start as u32) < span.lo().to_u32()
642 || (u32::MAX - end as u32) < span.lo().to_u32()
649 let new_lo = span.lo() + BytePos::from_usize(start);
650 let new_hi = span.lo() + BytePos::from_usize(end);
651 Some(span.with_lo(new_lo).with_hi(new_hi))
655 impl server::SourceFile for Rustc<'_> {
656 fn eq(&mut self, file1: &Self::SourceFile, file2: &Self::SourceFile) -> bool {
657 Lrc::ptr_eq(file1, file2)
659 fn path(&mut self, file: &Self::SourceFile) -> String {
661 FileName::Real(ref name) => name
663 .expect("attempting to get a file path in an imported file in `proc_macro::SourceFile::path`")
665 .expect("non-UTF8 file path in `proc_macro::SourceFile::path`")
667 _ => file.name.prefer_local().to_string(),
670 fn is_real(&mut self, file: &Self::SourceFile) -> bool {
675 impl server::MultiSpan for Rustc<'_> {
676 fn new(&mut self) -> Self::MultiSpan {
679 fn push(&mut self, spans: &mut Self::MultiSpan, span: Self::Span) {
684 impl server::Diagnostic for Rustc<'_> {
685 fn new(&mut self, level: Level, msg: &str, spans: Self::MultiSpan) -> Self::Diagnostic {
686 let mut diag = Diagnostic::new(level.to_internal(), msg);
687 diag.set_span(MultiSpan::from_spans(spans));
692 diag: &mut Self::Diagnostic,
695 spans: Self::MultiSpan,
697 diag.sub(level.to_internal(), msg, MultiSpan::from_spans(spans), None);
699 fn emit(&mut self, diag: Self::Diagnostic) {
700 self.sess.span_diagnostic.emit_diagnostic(&diag);
704 impl server::Span for Rustc<'_> {
705 fn debug(&mut self, span: Self::Span) -> String {
707 format!("{:?}", span)
709 format!("{:?} bytes({}..{})", span.ctxt(), span.lo().0, span.hi().0)
712 fn def_site(&mut self) -> Self::Span {
715 fn call_site(&mut self) -> Self::Span {
718 fn mixed_site(&mut self) -> Self::Span {
721 fn source_file(&mut self, span: Self::Span) -> Self::SourceFile {
722 self.sess.source_map().lookup_char_pos(span.lo()).file
724 fn parent(&mut self, span: Self::Span) -> Option<Self::Span> {
727 fn source(&mut self, span: Self::Span) -> Self::Span {
728 span.source_callsite()
730 fn start(&mut self, span: Self::Span) -> LineColumn {
731 let loc = self.sess.source_map().lookup_char_pos(span.lo());
732 LineColumn { line: loc.line, column: loc.col.to_usize() }
734 fn end(&mut self, span: Self::Span) -> LineColumn {
735 let loc = self.sess.source_map().lookup_char_pos(span.hi());
736 LineColumn { line: loc.line, column: loc.col.to_usize() }
738 fn join(&mut self, first: Self::Span, second: Self::Span) -> Option<Self::Span> {
739 let self_loc = self.sess.source_map().lookup_char_pos(first.lo());
740 let other_loc = self.sess.source_map().lookup_char_pos(second.lo());
742 if self_loc.file.name != other_loc.file.name {
746 Some(first.to(second))
748 fn resolved_at(&mut self, span: Self::Span, at: Self::Span) -> Self::Span {
749 span.with_ctxt(at.ctxt())
751 fn source_text(&mut self, span: Self::Span) -> Option<String> {
752 self.sess.source_map().span_to_snippet(span).ok()
754 /// Saves the provided span into the metadata of
755 /// *the crate we are currently compiling*, which must
756 /// be a proc-macro crate. This id can be passed to
757 /// `recover_proc_macro_span` when our current crate
758 /// is *run* as a proc-macro.
760 /// Let's suppose that we have two crates - `my_client`
761 /// and `my_proc_macro`. The `my_proc_macro` crate
762 /// contains a procedural macro `my_macro`, which
763 /// is implemented as: `quote! { "hello" }`
765 /// When we *compile* `my_proc_macro`, we will execute
766 /// the `quote` proc-macro. This will save the span of
767 /// "hello" into the metadata of `my_proc_macro`. As a result,
768 /// the body of `my_proc_macro` (after expansion) will end
769 /// up containg a call that looks like this:
770 /// `proc_macro::Ident::new("hello", proc_macro::Span::recover_proc_macro_span(0))`
772 /// where `0` is the id returned by this function.
773 /// When `my_proc_macro` *executes* (during the compilation of `my_client`),
774 /// the call to `recover_proc_macro_span` will load the corresponding
775 /// span from the metadata of `my_proc_macro` (which we have access to,
776 /// since we've loaded `my_proc_macro` from disk in order to execute it).
777 /// In this way, we have obtained a span pointing into `my_proc_macro`
778 fn save_span(&mut self, span: Self::Span) -> usize {
779 self.sess.save_proc_macro_span(span)
781 fn recover_proc_macro_span(&mut self, id: usize) -> Self::Span {
782 let (resolver, krate, def_site) = (self.resolver, self.krate, self.def_site);
783 *self.rebased_spans.entry(id).or_insert_with(|| {
784 // FIXME: `SyntaxContext` for spans from proc macro crates is lost during encoding,
785 // replace it with a def-site context until we are encoding it properly.
786 resolver.get_proc_macro_quoted_span(krate, id).with_ctxt(def_site.ctxt())
791 // See issue #74616 for details
792 fn ident_name_compatibility_hack(
795 rustc: &mut Rustc<'_>,
796 ) -> Option<(rustc_span::symbol::Ident, bool)> {
797 if let NtIdent(ident, is_raw) = nt {
798 if let ExpnKind::Macro(_, macro_name) = orig_span.ctxt().outer_expn_data().kind {
799 let source_map = rustc.sess.source_map();
800 let filename = source_map.span_to_filename(orig_span);
801 if let FileName::Real(RealFileName::LocalPath(path)) = filename {
802 let matches_prefix = |prefix, filename| {
803 // Check for a path that ends with 'prefix*/src/<filename>'
804 let mut iter = path.components().rev();
805 iter.next().and_then(|p| p.as_os_str().to_str()) == Some(filename)
806 && iter.next().and_then(|p| p.as_os_str().to_str()) == Some("src")
809 .and_then(|p| p.as_os_str().to_str())
810 .map_or(false, |p| p.starts_with(prefix))
813 let time_macros_impl =
814 macro_name == sym::impl_macros && matches_prefix("time-macros-impl", "lib.rs");
815 let js_sys = macro_name == sym::arrays && matches_prefix("js-sys", "lib.rs");
816 if time_macros_impl || js_sys {
817 let snippet = source_map.span_to_snippet(orig_span);
818 if snippet.as_deref() == Ok("$name") {
819 if time_macros_impl {
820 rustc.sess.buffer_lint_with_diagnostic(
821 &PROC_MACRO_BACK_COMPAT,
824 "using an old version of `time-macros-impl`",
825 BuiltinLintDiagnostics::ProcMacroBackCompat(
826 "the `time-macros-impl` crate will stop compiling in futures version of Rust. \
827 Please update to the latest version of the `time` crate to avoid breakage".to_string())
829 return Some((*ident, *is_raw));
832 if let Some(c) = path
834 .flat_map(|c| c.as_os_str().to_str())
835 .find(|c| c.starts_with("js-sys"))
837 let mut version = c.trim_start_matches("js-sys-").split('.');
838 if version.next() == Some("0")
839 && version.next() == Some("3")
842 .and_then(|c| c.parse::<u32>().ok())
843 .map_or(false, |v| v < 40)
845 rustc.sess.buffer_lint_with_diagnostic(
846 &PROC_MACRO_BACK_COMPAT,
849 "using an old version of `js-sys`",
850 BuiltinLintDiagnostics::ProcMacroBackCompat(
851 "older versions of the `js-sys` crate will stop compiling in future versions of Rust; \
852 please update to `js-sys` v0.3.40 or above".to_string())
854 return Some((*ident, *is_raw));
861 if macro_name == sym::tuple_from_req && matches_prefix("actix-web", "extract.rs") {
862 let snippet = source_map.span_to_snippet(orig_span);
863 if snippet.as_deref() == Ok("$T") {
864 if let FileName::Real(RealFileName::LocalPath(macro_path)) =
865 source_map.span_to_filename(rustc.def_site)
867 if macro_path.to_string_lossy().contains("pin-project-internal-0.") {
868 rustc.sess.buffer_lint_with_diagnostic(
869 &PROC_MACRO_BACK_COMPAT,
872 "using an old version of `actix-web`",
873 BuiltinLintDiagnostics::ProcMacroBackCompat(
874 "the version of `actix-web` you are using might stop compiling in future versions of Rust; \
875 please update to the latest version of the `actix-web` crate to avoid breakage".to_string())
877 return Some((*ident, *is_raw));