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

Cleanup span quoting

I finally got to reviewing rust-lang#84278.
See the individual commit messages.
r? `@Aaron1011`

Author: bors

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 })));
 }

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((

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,

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,

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 {

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,

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())
 }

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),

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);

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)
         }