Auto merge of #87042 - petrochenkov:cleanquotspan, r=Aaron1011

Cleanup span quoting

I finally got to reviewing https://github.com/rust-lang/rust/pull/84278.
See the individual commit messages.
r? `@Aaron1011`

16 files changed, 74 insertions, 166 deletions

diff --git a/compiler/rustc_builtin_macros/src/lib.rs b/compiler/rustc_builtin_macros/src/lib.rs
index 2393e0b9ebf..ba27f103309 100644
--- a/compiler/rustc_builtin_macros/src/lib.rs
+++ b/compiler/rustc_builtin_macros/src/lib.rs
@@ -19,7 +19,6 @@ use crate::deriving::*;
 
 use rustc_expand::base::{MacroExpanderFn, ResolverExpand, SyntaxExtensionKind};
 use rustc_expand::proc_macro::BangProcMacro;
-use rustc_span::def_id::LOCAL_CRATE;
 use rustc_span::symbol::sym;
 
 mod asm;
@@ -113,8 +112,5 @@ pub fn register_builtin_macros(resolver: &mut dyn ResolverExpand) {
     }
 
     let client = proc_macro::bridge::client::Client::expand1(proc_macro::quote);
-    register(
-        sym::quote,
-        SyntaxExtensionKind::Bang(Box::new(BangProcMacro { client, krate: LOCAL_CRATE })),
-    );
+    register(sym::quote, SyntaxExtensionKind::Bang(Box::new(BangProcMacro { client })));
 }
diff --git a/compiler/rustc_errors/src/emitter.rs b/compiler/rustc_errors/src/emitter.rs
index d3f92bf3047..fd024a8ecfa 100644
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
@@ -309,9 +309,7 @@ pub trait Emitter {
                     // are some which do actually involve macros.
                     ExpnKind::Inlined | ExpnKind::Desugaring(..) | ExpnKind::AstPass(..) => None,
 
-                    ExpnKind::Macro { kind: macro_kind, name, proc_macro: _ } => {
-                        Some((macro_kind, name))
-                    }
+                    ExpnKind::Macro(macro_kind, name) => Some((macro_kind, name)),
                 }
             });
 
@@ -372,19 +370,10 @@ pub trait Emitter {
                     new_labels
                         .push((trace.call_site, "in the inlined copy of this code".to_string()));
                 } else if always_backtrace {
-                    let proc_macro = if let ExpnKind::Macro { kind: _, name: _, proc_macro: true } =
-                        trace.kind
-                    {
-                        "procedural macro "
-                    } else {
-                        ""
-                    };
-
                     new_labels.push((
                         trace.def_site,
                         format!(
-                            "in this expansion of {}`{}`{}",
-                            proc_macro,
+                            "in this expansion of `{}`{}",
                             trace.kind.descr(),
                             if macro_backtrace.len() > 1 {
                                 // if macro_backtrace.len() == 1 it'll be
@@ -410,11 +399,7 @@ pub trait Emitter {
                 // and it needs an "in this macro invocation" label to match that.
                 let redundant_span = trace.call_site.contains(sp);
 
-                if !redundant_span
-                    && matches!(
-                        trace.kind,
-                        ExpnKind::Macro { kind: MacroKind::Bang, name: _, proc_macro: _ }
-                    )
+                if !redundant_span && matches!(trace.kind, ExpnKind::Macro(MacroKind::Bang, _))
                     || always_backtrace
                 {
                     new_labels.push((
diff --git a/compiler/rustc_expand/src/base.rs b/compiler/rustc_expand/src/base.rs
index 67d71ce48ff..b3e52502b07 100644
--- a/compiler/rustc_expand/src/base.rs
+++ b/compiler/rustc_expand/src/base.rs
@@ -811,16 +811,8 @@ impl SyntaxExtension {
         macro_def_id: Option<DefId>,
         parent_module: Option<DefId>,
     ) -> ExpnData {
-        use SyntaxExtensionKind::*;
-        let proc_macro = match self.kind {
-            // User-defined proc macro
-            Bang(..) | Attr(..) | Derive(..) => true,
-            // Consider everthing else to be not a proc
-            // macro for diagnostic purposes
-            LegacyBang(..) | LegacyAttr(..) | NonMacroAttr { .. } | LegacyDerive(..) => false,
-        };
         ExpnData::new(
-            ExpnKind::Macro { kind: self.macro_kind(), name: descr, proc_macro },
+            ExpnKind::Macro(self.macro_kind(), descr),
             parent,
             call_site,
             self.span,
diff --git a/compiler/rustc_expand/src/proc_macro.rs b/compiler/rustc_expand/src/proc_macro.rs
index 494b3fb61ee..3f84979ac05 100644
--- a/compiler/rustc_expand/src/proc_macro.rs
+++ b/compiler/rustc_expand/src/proc_macro.rs
@@ -9,14 +9,12 @@ use rustc_data_structures::sync::Lrc;
 use rustc_errors::ErrorReported;
 use rustc_parse::nt_to_tokenstream;
 use rustc_parse::parser::ForceCollect;
-use rustc_span::def_id::CrateNum;
 use rustc_span::{Span, DUMMY_SP};
 
 const EXEC_STRATEGY: pm::bridge::server::SameThread = pm::bridge::server::SameThread;
 
 pub struct BangProcMacro {
     pub client: pm::bridge::client::Client<fn(pm::TokenStream) -> pm::TokenStream>,
-    pub krate: CrateNum,
 }
 
 impl base::ProcMacro for BangProcMacro {
@@ -26,7 +24,7 @@ impl base::ProcMacro for BangProcMacro {
         span: Span,
         input: TokenStream,
     ) -> Result<TokenStream, ErrorReported> {
-        let server = proc_macro_server::Rustc::new(ecx, self.krate);
+        let server = proc_macro_server::Rustc::new(ecx);
         self.client.run(&EXEC_STRATEGY, server, input, ecx.ecfg.proc_macro_backtrace).map_err(|e| {
             let mut err = ecx.struct_span_err(span, "proc macro panicked");
             if let Some(s) = e.as_str() {
@@ -40,7 +38,6 @@ impl base::ProcMacro for BangProcMacro {
 
 pub struct AttrProcMacro {
     pub client: pm::bridge::client::Client<fn(pm::TokenStream, pm::TokenStream) -> pm::TokenStream>,
-    pub krate: CrateNum,
 }
 
 impl base::AttrProcMacro for AttrProcMacro {
@@ -51,7 +48,7 @@ impl base::AttrProcMacro for AttrProcMacro {
         annotation: TokenStream,
         annotated: TokenStream,
     ) -> Result<TokenStream, ErrorReported> {
-        let server = proc_macro_server::Rustc::new(ecx, self.krate);
+        let server = proc_macro_server::Rustc::new(ecx);
         self.client
             .run(&EXEC_STRATEGY, server, annotation, annotated, ecx.ecfg.proc_macro_backtrace)
             .map_err(|e| {
@@ -67,7 +64,6 @@ impl base::AttrProcMacro for AttrProcMacro {
 
 pub struct ProcMacroDerive {
     pub client: pm::bridge::client::Client<fn(pm::TokenStream) -> pm::TokenStream>,
-    pub krate: CrateNum,
 }
 
 impl MultiItemModifier for ProcMacroDerive {
@@ -101,7 +97,7 @@ impl MultiItemModifier for ProcMacroDerive {
             nt_to_tokenstream(&item, &ecx.sess.parse_sess, CanSynthesizeMissingTokens::No)
         };
 
-        let server = proc_macro_server::Rustc::new(ecx, self.krate);
+        let server = proc_macro_server::Rustc::new(ecx);
         let stream =
             match self.client.run(&EXEC_STRATEGY, server, input, ecx.ecfg.proc_macro_backtrace) {
                 Ok(stream) => stream,
diff --git a/compiler/rustc_expand/src/proc_macro_server.rs b/compiler/rustc_expand/src/proc_macro_server.rs
index 1d73002710d..ff135f60a82 100644
--- a/compiler/rustc_expand/src/proc_macro_server.rs
+++ b/compiler/rustc_expand/src/proc_macro_server.rs
@@ -14,7 +14,6 @@ use rustc_parse::lexer::nfc_normalize;
 use rustc_parse::{nt_to_tokenstream, parse_stream_from_source_str};
 use rustc_session::parse::ParseSess;
 use rustc_span::def_id::CrateNum;
-use rustc_span::hygiene::ExpnId;
 use rustc_span::hygiene::ExpnKind;
 use rustc_span::symbol::{self, kw, sym, Symbol};
 use rustc_span::{BytePos, FileName, MultiSpan, Pos, RealFileName, SourceFile, Span};
@@ -363,26 +362,20 @@ pub(crate) struct Rustc<'a> {
     mixed_site: Span,
     span_debug: bool,
     krate: CrateNum,
-    expn_id: ExpnId,
     rebased_spans: FxHashMap<usize, Span>,
 }
 
 impl<'a> Rustc<'a> {
-    pub fn new(cx: &'a ExtCtxt<'_>, krate: CrateNum) -> Self {
+    pub fn new(cx: &'a ExtCtxt<'_>) -> Self {
         let expn_data = cx.current_expansion.id.expn_data();
-        let def_site = cx.with_def_site_ctxt(expn_data.def_site);
-        let call_site = cx.with_call_site_ctxt(expn_data.call_site);
-        let mixed_site = cx.with_mixed_site_ctxt(expn_data.call_site);
-        let sess = cx.parse_sess();
         Rustc {
             resolver: cx.resolver,
-            sess,
-            def_site,
-            call_site,
-            mixed_site,
+            sess: cx.parse_sess(),
+            def_site: cx.with_def_site_ctxt(expn_data.def_site),
+            call_site: cx.with_call_site_ctxt(expn_data.call_site),
+            mixed_site: cx.with_mixed_site_ctxt(expn_data.call_site),
             span_debug: cx.ecfg.span_debug,
-            krate,
-            expn_id: cx.current_expansion.id,
+            krate: expn_data.macro_def_id.unwrap().krate,
             rebased_spans: FxHashMap::default(),
         }
     }
@@ -782,25 +775,15 @@ impl server::Span for Rustc<'_> {
     /// span from the metadata of `my_proc_macro` (which we have access to,
     /// since we've loaded `my_proc_macro` from disk in order to execute it).
     /// In this way, we have obtained a span pointing into `my_proc_macro`
-    fn save_span(&mut self, mut span: Self::Span) -> usize {
-        // Throw away the `SyntaxContext`, since we currently
-        // skip serializing `SyntaxContext`s for proc-macro crates
-        span = span.with_ctxt(rustc_span::SyntaxContext::root());
+    fn save_span(&mut self, span: Self::Span) -> usize {
         self.sess.save_proc_macro_span(span)
     }
     fn recover_proc_macro_span(&mut self, id: usize) -> Self::Span {
-        let resolver = self.resolver;
-        let krate = self.krate;
-        let expn_id = self.expn_id;
+        let (resolver, krate, def_site) = (self.resolver, self.krate, self.def_site);
         *self.rebased_spans.entry(id).or_insert_with(|| {
-            let raw_span = resolver.get_proc_macro_quoted_span(krate, id);
-            // Ignore the deserialized `SyntaxContext` entirely.
-            // FIXME: Preserve the macro backtrace from the serialized span
-            // For example, if a proc-macro crate has code like
-            // `macro_one!() -> macro_two!() -> quote!()`, we might
-            // want to 'concatenate' this backtrace with the backtrace from
-            // our current call site.
-            raw_span.with_def_site_ctxt(expn_id)
+            // FIXME: `SyntaxContext` for spans from proc macro crates is lost during encoding,
+            // replace it with a def-site context until we are encoding it properly.
+            resolver.get_proc_macro_quoted_span(krate, id).with_ctxt(def_site.ctxt())
         })
     }
 }
@@ -812,7 +795,7 @@ fn ident_name_compatibility_hack(
     rustc: &mut Rustc<'_>,
 ) -> Option<(rustc_span::symbol::Ident, bool)> {
     if let NtIdent(ident, is_raw) = nt {
-        if let ExpnKind::Macro { name: macro_name, .. } = orig_span.ctxt().outer_expn_data().kind {
+        if let ExpnKind::Macro(_, macro_name) = orig_span.ctxt().outer_expn_data().kind {
             let source_map = rustc.sess.source_map();
             let filename = source_map.span_to_filename(orig_span);
             if let FileName::Real(RealFileName::LocalPath(path)) = filename {
diff --git a/compiler/rustc_lint/src/internal.rs b/compiler/rustc_lint/src/internal.rs
index 0398d4a9961..9b1a339572e 100644
--- a/compiler/rustc_lint/src/internal.rs
+++ b/compiler/rustc_lint/src/internal.rs
@@ -248,21 +248,10 @@ impl EarlyLintPass for LintPassImpl {
                 if last.ident.name == sym::LintPass {
                     let expn_data = lint_pass.path.span.ctxt().outer_expn_data();
                     let call_site = expn_data.call_site;
-                    if !matches!(
-                        expn_data.kind,
-                        ExpnKind::Macro {
-                            kind: MacroKind::Bang,
-                            name: sym::impl_lint_pass,
-                            proc_macro: _
-                        }
-                    ) && !matches!(
-                        call_site.ctxt().outer_expn_data().kind,
-                        ExpnKind::Macro {
-                            kind: MacroKind::Bang,
-                            name: sym::declare_lint_pass,
-                            proc_macro: _
-                        }
-                    ) {
+                    if expn_data.kind != ExpnKind::Macro(MacroKind::Bang, sym::impl_lint_pass)
+                        && call_site.ctxt().outer_expn_data().kind
+                            != ExpnKind::Macro(MacroKind::Bang, sym::declare_lint_pass)
+                    {
                         cx.struct_span_lint(
                             LINT_PASS_IMPL_WITHOUT_MACRO,
                             lint_pass.path.span,
diff --git a/compiler/rustc_lint/src/non_fmt_panic.rs b/compiler/rustc_lint/src/non_fmt_panic.rs
index 99a88f6bf61..a32caf1bc43 100644
--- a/compiler/rustc_lint/src/non_fmt_panic.rs
+++ b/compiler/rustc_lint/src/non_fmt_panic.rs
@@ -256,10 +256,6 @@ fn panic_call<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>) -> (Span,
     }
 
     let macro_symbol =
-        if let hygiene::ExpnKind::Macro { kind: _, name: symbol, proc_macro: _ } = expn.kind {
-            symbol
-        } else {
-            Symbol::intern("panic")
-        };
+        if let hygiene::ExpnKind::Macro(_, symbol) = expn.kind { symbol } else { sym::panic };
     (expn.call_site, panic_macro, macro_symbol.as_str())
 }
diff --git a/compiler/rustc_metadata/src/rmeta/decoder.rs b/compiler/rustc_metadata/src/rmeta/decoder.rs
index 3860d0daadf..6ecd4a512e9 100644
--- a/compiler/rustc_metadata/src/rmeta/decoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/decoder.rs
@@ -725,37 +725,30 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
             .decode((self, sess))
     }
 
-    fn load_proc_macro(&self, def_id: DefId, sess: &Session) -> SyntaxExtension {
-        let (name, kind, helper_attrs) = match *self.raw_proc_macro(def_id.index) {
+    fn load_proc_macro(&self, id: DefIndex, sess: &Session) -> SyntaxExtension {
+        let (name, kind, helper_attrs) = match *self.raw_proc_macro(id) {
             ProcMacro::CustomDerive { trait_name, attributes, client } => {
                 let helper_attrs =
                     attributes.iter().cloned().map(Symbol::intern).collect::<Vec<_>>();
                 (
                     trait_name,
-                    SyntaxExtensionKind::Derive(Box::new(ProcMacroDerive {
-                        client,
-                        krate: def_id.krate,
-                    })),
+                    SyntaxExtensionKind::Derive(Box::new(ProcMacroDerive { client })),
                     helper_attrs,
                 )
             }
-            ProcMacro::Attr { name, client } => (
-                name,
-                SyntaxExtensionKind::Attr(Box::new(AttrProcMacro { client, krate: def_id.krate })),
-                Vec::new(),
-            ),
-            ProcMacro::Bang { name, client } => (
-                name,
-                SyntaxExtensionKind::Bang(Box::new(BangProcMacro { client, krate: def_id.krate })),
-                Vec::new(),
-            ),
+            ProcMacro::Attr { name, client } => {
+                (name, SyntaxExtensionKind::Attr(Box::new(AttrProcMacro { client })), Vec::new())
+            }
+            ProcMacro::Bang { name, client } => {
+                (name, SyntaxExtensionKind::Bang(Box::new(BangProcMacro { client })), Vec::new())
+            }
         };
 
-        let attrs: Vec<_> = self.get_item_attrs(def_id.index, sess).collect();
+        let attrs: Vec<_> = self.get_item_attrs(id, sess).collect();
         SyntaxExtension::new(
             sess,
             kind,
-            self.get_span(def_id.index, sess),
+            self.get_span(id, sess),
             helper_attrs,
             self.root.edition,
             Symbol::intern(name),
diff --git a/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs b/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
index 68cf4304b71..473ae4eb386 100644
--- a/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
+++ b/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
@@ -411,7 +411,7 @@ impl CStore {
 
         let data = self.get_crate_data(id.krate);
         if data.root.is_proc_macro_crate() {
-            return LoadedMacro::ProcMacro(data.load_proc_macro(id, sess));
+            return LoadedMacro::ProcMacro(data.load_proc_macro(id.index, sess));
         }
 
         let span = data.get_span(id.index, sess);
diff --git a/compiler/rustc_middle/src/lint.rs b/compiler/rustc_middle/src/lint.rs
index c9b6cee5deb..63872ca9017 100644
--- a/compiler/rustc_middle/src/lint.rs
+++ b/compiler/rustc_middle/src/lint.rs
@@ -387,7 +387,7 @@ pub fn in_external_macro(sess: &Session, span: Span) -> bool {
             false
         }
         ExpnKind::AstPass(_) | ExpnKind::Desugaring(_) => true, // well, it's "external"
-        ExpnKind::Macro { kind: MacroKind::Bang, name: _, proc_macro: _ } => {
+        ExpnKind::Macro(MacroKind::Bang, _) => {
             // Dummy span for the `def_site` means it's an external macro.
             expn_data.def_site.is_dummy() || sess.source_map().is_imported(expn_data.def_site)
         }
diff --git a/compiler/rustc_mir/src/transform/coverage/spans.rs b/compiler/rustc_mir/src/transform/coverage/spans.rs
index f62171b3c53..08cc87ccc34 100644
--- a/compiler/rustc_mir/src/transform/coverage/spans.rs
+++ b/compiler/rustc_mir/src/transform/coverage/spans.rs
@@ -184,11 +184,8 @@ impl CoverageSpan {
         self.current_macro_or_none
             .borrow_mut()
             .get_or_insert_with(|| {
-                if let ExpnKind::Macro {
-                    kind: MacroKind::Bang,
-                    name: current_macro,
-                    proc_macro: _,
-                } = self.expn_span.ctxt().outer_expn_data().kind
+                if let ExpnKind::Macro(MacroKind::Bang, current_macro) =
+                    self.expn_span.ctxt().outer_expn_data().kind
                 {
                     return Some(current_macro);
                 }
diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs
index 559a9967086..bcdae1cb43d 100644
--- a/compiler/rustc_resolve/src/lib.rs
+++ b/compiler/rustc_resolve/src/lib.rs
@@ -1775,11 +1775,9 @@ impl<'a> Resolver<'a> {
                     let expn_data = expn_id.expn_data();
                     match expn_data.kind {
                         ExpnKind::Root
-                        | ExpnKind::Macro {
-                            kind: MacroKind::Bang | MacroKind::Derive,
-                            name: _,
-                            proc_macro: _,
-                        } => Scope::DeriveHelpersCompat,
+                        | ExpnKind::Macro(MacroKind::Bang | MacroKind::Derive, _) => {
+                            Scope::DeriveHelpersCompat
+                        }
                         _ => Scope::DeriveHelpers(expn_data.parent),
                     }
                 }
diff --git a/compiler/rustc_resolve/src/macros.rs b/compiler/rustc_resolve/src/macros.rs
index 1727586071d..e024ade7b3c 100644
--- a/compiler/rustc_resolve/src/macros.rs
+++ b/compiler/rustc_resolve/src/macros.rs
@@ -319,11 +319,7 @@ impl<'a> ResolverExpand for Resolver<'a> {
                         let expn_data = expn_id.expn_data();
                         match expn_data.kind {
                             ExpnKind::Root
-                            | ExpnKind::Macro {
-                                name: _,
-                                kind: MacroKind::Bang | MacroKind::Derive,
-                                proc_macro: _,
-                            } => {
+                            | ExpnKind::Macro(MacroKind::Bang | MacroKind::Derive, _) => {
                                 break;
                             }
                             _ => expn_id = expn_data.parent,
diff --git a/compiler/rustc_save_analysis/src/lib.rs b/compiler/rustc_save_analysis/src/lib.rs
index ef2bae5e287..0a8a88132e3 100644
--- a/compiler/rustc_save_analysis/src/lib.rs
+++ b/compiler/rustc_save_analysis/src/lib.rs
@@ -788,7 +788,7 @@ impl<'tcx> SaveContext<'tcx> {
         let callee = span.source_callee()?;
 
         let mac_name = match callee.kind {
-            ExpnKind::Macro { kind, name, proc_macro: _ } => match kind {
+            ExpnKind::Macro(kind, name) => match kind {
                 MacroKind::Bang => name,
 
                 // Ignore attribute macros, their spans are usually mangled
diff --git a/compiler/rustc_span/src/hygiene.rs b/compiler/rustc_span/src/hygiene.rs
index b2da51f8f38..78b181aa330 100644
--- a/compiler/rustc_span/src/hygiene.rs
+++ b/compiler/rustc_span/src/hygiene.rs
@@ -144,10 +144,7 @@ impl ExpnId {
             let expn_data = self.expn_data();
             // Stop going up the backtrace once include! is encountered
             if expn_data.is_root()
-                || matches!(
-                    expn_data.kind,
-                    ExpnKind::Macro { kind: MacroKind::Bang, name: sym::include, proc_macro: _ }
-                )
+                || expn_data.kind == ExpnKind::Macro(MacroKind::Bang, sym::include)
             {
                 break;
             }
@@ -712,31 +709,6 @@ pub struct ExpnData {
     /// call_site span would have its own ExpnData, with the call_site
     /// pointing to the `foo!` invocation.
     pub call_site: Span,
-
-    // --- The part specific to the macro/desugaring definition.
-    // --- It may be reasonable to share this part between expansions with the same definition,
-    // --- but such sharing is known to bring some minor inconveniences without also bringing
-    // --- noticeable perf improvements (PR #62898).
-    /// The span of the macro definition (possibly dummy).
-    /// This span serves only informational purpose and is not used for resolution.
-    pub def_site: Span,
-    /// List of `#[unstable]`/feature-gated features that the macro is allowed to use
-    /// internally without forcing the whole crate to opt-in
-    /// to them.
-    pub allow_internal_unstable: Option<Lrc<[Symbol]>>,
-    /// Whether the macro is allowed to use `unsafe` internally
-    /// even if the user crate has `#![forbid(unsafe_code)]`.
-    pub allow_internal_unsafe: bool,
-    /// Enables the macro helper hack (`ident!(...)` -> `$crate::ident!(...)`)
-    /// for a given macro.
-    pub local_inner_macros: bool,
-    /// Edition of the crate in which the macro is defined.
-    pub edition: Edition,
-    /// The `DefId` of the macro being invoked,
-    /// if this `ExpnData` corresponds to a macro invocation
-    pub macro_def_id: Option<DefId>,
-    /// The normal module (`mod`) in which the expanded macro was defined.
-    pub parent_module: Option<DefId>,
     /// The crate that originally created this `ExpnData`. During
     /// metadata serialization, we only encode `ExpnData`s that were
     /// created locally - when our serialized metadata is decoded,
@@ -751,7 +723,6 @@ pub struct ExpnData {
     // be considered equivalent.
     #[stable_hasher(ignore)]
     orig_id: Option<u32>,
-
     /// Used to force two `ExpnData`s to have different `Fingerprint`s.
     /// Due to macro expansion, it's possible to end up with two `ExpnId`s
     /// that have identical `ExpnData`s. This violates the contract of `HashStable`
@@ -763,6 +734,31 @@ pub struct ExpnData {
     /// `ExpnId`s would end up with the same `Fingerprint`. Since `ExpnData` includes
     /// a `krate` field, this value only needs to be unique within a single crate.
     disambiguator: u32,
+
+    // --- The part specific to the macro/desugaring definition.
+    // --- It may be reasonable to share this part between expansions with the same definition,
+    // --- but such sharing is known to bring some minor inconveniences without also bringing
+    // --- noticeable perf improvements (PR #62898).
+    /// The span of the macro definition (possibly dummy).
+    /// This span serves only informational purpose and is not used for resolution.
+    pub def_site: Span,
+    /// List of `#[unstable]`/feature-gated features that the macro is allowed to use
+    /// internally without forcing the whole crate to opt-in
+    /// to them.
+    pub allow_internal_unstable: Option<Lrc<[Symbol]>>,
+    /// Whether the macro is allowed to use `unsafe` internally
+    /// even if the user crate has `#![forbid(unsafe_code)]`.
+    pub allow_internal_unsafe: bool,
+    /// Enables the macro helper hack (`ident!(...)` -> `$crate::ident!(...)`)
+    /// for a given macro.
+    pub local_inner_macros: bool,
+    /// Edition of the crate in which the macro is defined.
+    pub edition: Edition,
+    /// The `DefId` of the macro being invoked,
+    /// if this `ExpnData` corresponds to a macro invocation
+    pub macro_def_id: Option<DefId>,
+    /// The normal module (`mod`) in which the expanded macro was defined.
+    pub parent_module: Option<DefId>,
 }
 
 // These would require special handling of `orig_id`.
@@ -850,13 +846,7 @@ pub enum ExpnKind {
     /// No expansion, aka root expansion. Only `ExpnId::root()` has this kind.
     Root,
     /// Expansion produced by a macro.
-    Macro {
-        kind: MacroKind,
-        name: Symbol,
-        /// If `true`, this macro is a procedural macro. This
-        /// flag is only used for diagnostic purposes
-        proc_macro: bool,
-    },
+    Macro(MacroKind, Symbol),
     /// Transform done by the compiler on the AST.
     AstPass(AstPass),
     /// Desugaring done by the compiler during HIR lowering.
@@ -869,7 +859,7 @@ impl ExpnKind {
     pub fn descr(&self) -> String {
         match *self {
             ExpnKind::Root => kw::PathRoot.to_string(),
-            ExpnKind::Macro { kind, name, proc_macro: _ } => match kind {
+            ExpnKind::Macro(macro_kind, name) => match macro_kind {
                 MacroKind::Bang => format!("{}!", name),
                 MacroKind::Attr => format!("#[{}]", name),
                 MacroKind::Derive => format!("#[derive({})]", name),
diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs
index 6265470e625..84bef4b113c 100644
--- a/compiler/rustc_span/src/lib.rs
+++ b/compiler/rustc_span/src/lib.rs
@@ -520,10 +520,7 @@ impl Span {
 
     /// Returns `true` if `span` originates in a derive-macro's expansion.
     pub fn in_derive_expansion(self) -> bool {
-        matches!(
-            self.ctxt().outer_expn_data().kind,
-            ExpnKind::Macro { kind: MacroKind::Derive, name: _, proc_macro: _ }
-        )
+        matches!(self.ctxt().outer_expn_data().kind, ExpnKind::Macro(MacroKind::Derive, _))
     }
 
     #[inline]