Rollup of 11 pull requests

compiler/rustc_codegen_llvm/src/coverageinfo/mapgen/spans.rs

@@ -39,7 +39,10 @@ impl Coords {
 /// or other expansions), and if it does happen then skipping a span or function is
 /// better than an ICE or `llvm-cov` failure that the user might have no way to avoid.
 pub(crate) fn make_coords(source_map: &SourceMap, file: &SourceFile, span: Span) -> Option<Coords> {
-    let span = ensure_non_empty_span(source_map, span)?;
+    if span.is_empty() {
+        debug_assert!(false, "can't make coords from empty span: {span:?}");
+        return None;
+    }
 
     let lo = span.lo();
     let hi = span.hi();
@@ -70,29 +73,6 @@ pub(crate) fn make_coords(source_map: &SourceMap, file: &SourceFile, span: Span)
     })
 }
 
-fn ensure_non_empty_span(source_map: &SourceMap, span: Span) -> Option<Span> {
-    if !span.is_empty() {
-        return Some(span);
-    }
-
-    // The span is empty, so try to enlarge it to cover an adjacent '{' or '}'.
-    source_map
-        .span_to_source(span, |src, start, end| try {
-            // Adjusting span endpoints by `BytePos(1)` is normally a bug,
-            // but in this case we have specifically checked that the character
-            // we're skipping over is one of two specific ASCII characters, so
-            // adjusting by exactly 1 byte is correct.
-            if src.as_bytes().get(end).copied() == Some(b'{') {
-                Some(span.with_hi(span.hi() + BytePos(1)))
-            } else if start > 0 && src.as_bytes()[start - 1] == b'}' {
-                Some(span.with_lo(span.lo() - BytePos(1)))
-            } else {
-                None
-            }
-        })
-        .ok()?
-}
-
 /// If `llvm-cov` sees a source region that is improperly ordered (end < start),
 /// it will immediately exit with a fatal error. To prevent that from happening,
 /// discard regions that are improperly ordered, or might be interpreted in a

compiler/rustc_const_eval/src/interpret/memory.rs

@@ -1000,7 +1000,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         ptr: Pointer<Option<M::Provenance>>,
     ) -> InterpResult<'tcx, (Ty<'tcx>, u64)> {
         let (alloc_id, offset, _meta) = self.ptr_get_alloc_id(ptr, 0)?;
-        let GlobalAlloc::TypeId { ty } = self.tcx.global_alloc(alloc_id) else {
+        let Some(GlobalAlloc::TypeId { ty }) = self.tcx.try_get_global_alloc(alloc_id) else {
             throw_ub_format!("invalid `TypeId` value: not all bytes carry type id metadata")
         };
         interp_ok((ty, offset.bytes()))

compiler/rustc_expand/src/base.rs

@@ -1,3 +1,4 @@
+use std::any::Any;
 use std::default::Default;
 use std::iter;
 use std::path::Component::Prefix;
@@ -361,25 +362,21 @@ where
 }
 
 /// Represents a thing that maps token trees to Macro Results
-pub trait TTMacroExpander {
+pub trait TTMacroExpander: Any {
     fn expand<'cx>(
         &self,
         ecx: &'cx mut ExtCtxt<'_>,
         span: Span,
         input: TokenStream,
     ) -> MacroExpanderResult<'cx>;
-
-    fn get_unused_rule(&self, _rule_i: usize) -> Option<(&Ident, Span)> {
-        None
-    }
 }
 
 pub type MacroExpanderResult<'cx> = ExpandResult<Box<dyn MacResult + 'cx>, ()>;
 
 pub type MacroExpanderFn =
     for<'cx> fn(&'cx mut ExtCtxt<'_>, Span, TokenStream) -> MacroExpanderResult<'cx>;
 
-impl<F> TTMacroExpander for F
+impl<F: 'static> TTMacroExpander for F
 where
     F: for<'cx> Fn(&'cx mut ExtCtxt<'_>, Span, TokenStream) -> MacroExpanderResult<'cx>,
 {

compiler/rustc_expand/src/lib.rs

@@ -22,7 +22,7 @@ mod placeholders;
 mod proc_macro_server;
 mod stats;
 
-pub use mbe::macro_rules::compile_declarative_macro;
+pub use mbe::macro_rules::{MacroRulesMacroExpander, compile_declarative_macro};
 pub mod base;
 pub mod config;
 pub mod expand;

compiler/rustc_expand/src/mbe/macro_rules.rs

@@ -128,14 +128,22 @@ pub(super) struct MacroRule {
     rhs: mbe::TokenTree,
 }
 
-struct MacroRulesMacroExpander {
+pub struct MacroRulesMacroExpander {
     node_id: NodeId,
     name: Ident,
     span: Span,
     transparency: Transparency,
     rules: Vec<MacroRule>,
 }
 
+impl MacroRulesMacroExpander {
+    pub fn get_unused_rule(&self, rule_i: usize) -> Option<(&Ident, Span)> {
+        // If the rhs contains an invocation like `compile_error!`, don't report it as unused.
+        let rule = &self.rules[rule_i];
+        if has_compile_error_macro(&rule.rhs) { None } else { Some((&self.name, rule.lhs_span)) }
+    }
+}
+
 impl TTMacroExpander for MacroRulesMacroExpander {
     fn expand<'cx>(
         &self,
@@ -154,12 +162,6 @@ impl TTMacroExpander for MacroRulesMacroExpander {
             &self.rules,
         ))
     }
-
-    fn get_unused_rule(&self, rule_i: usize) -> Option<(&Ident, Span)> {
-        // If the rhs contains an invocation like `compile_error!`, don't report it as unused.
-        let rule = &self.rules[rule_i];
-        if has_compile_error_macro(&rule.rhs) { None } else { Some((&self.name, rule.lhs_span)) }
-    }
 }
 
 struct DummyExpander(ErrorGuaranteed);

compiler/rustc_mir_transform/src/coverage/spans.rs

@@ -1,7 +1,8 @@
 use rustc_data_structures::fx::FxHashSet;
 use rustc_middle::mir;
 use rustc_middle::ty::TyCtxt;
-use rustc_span::{DesugaringKind, ExpnKind, MacroKind, Span};
+use rustc_span::source_map::SourceMap;
+use rustc_span::{BytePos, DesugaringKind, ExpnKind, MacroKind, Span};
 use tracing::instrument;
 
 use crate::coverage::graph::{BasicCoverageBlock, CoverageGraph};
@@ -83,8 +84,18 @@ pub(super) fn extract_refined_covspans<'tcx>(
     // Discard any span that overlaps with a hole.
     discard_spans_overlapping_holes(&mut covspans, &holes);
 
-    // Perform more refinement steps after holes have been dealt with.
+    // Discard spans that overlap in unwanted ways.
     let mut covspans = remove_unwanted_overlapping_spans(covspans);
+
+    // For all empty spans, either enlarge them to be non-empty, or discard them.
+    let source_map = tcx.sess.source_map();
+    covspans.retain_mut(|covspan| {
+        let Some(span) = ensure_non_empty_span(source_map, covspan.span) else { return false };
+        covspan.span = span;
+        true
+    });
+
+    // Merge covspans that can be merged.
     covspans.dedup_by(|b, a| a.merge_if_eligible(b));
 
     code_mappings.extend(covspans.into_iter().map(|Covspan { span, bcb }| {
@@ -230,3 +241,26 @@ fn compare_spans(a: Span, b: Span) -> std::cmp::Ordering {
         // - Both have the same start and span A extends further right
         .then_with(|| Ord::cmp(&a.hi(), &b.hi()).reverse())
 }
+
+fn ensure_non_empty_span(source_map: &SourceMap, span: Span) -> Option<Span> {
+    if !span.is_empty() {
+        return Some(span);
+    }
+
+    // The span is empty, so try to enlarge it to cover an adjacent '{' or '}'.
+    source_map
+        .span_to_source(span, |src, start, end| try {
+            // Adjusting span endpoints by `BytePos(1)` is normally a bug,
+            // but in this case we have specifically checked that the character
+            // we're skipping over is one of two specific ASCII characters, so
+            // adjusting by exactly 1 byte is correct.
+            if src.as_bytes().get(end).copied() == Some(b'{') {
+                Some(span.with_hi(span.hi() + BytePos(1)))
+            } else if start > 0 && src.as_bytes()[start - 1] == b'}' {
+                Some(span.with_lo(span.lo() - BytePos(1)))
+            } else {
+                None
+            }
+        })
+        .ok()?
+}

compiler/rustc_parse/src/lexer/diagnostics.rs

@@ -126,23 +126,29 @@ pub(super) fn report_suspicious_mismatch_block(
     }
 }
 
-pub(crate) fn make_unclosed_delims_error(
-    unmatched: UnmatchedDelim,
-    psess: &ParseSess,
-) -> Option<Diag<'_>> {
-    // `None` here means an `Eof` was found. We already emit those errors elsewhere, we add them to
-    // `unmatched_delims` only for error recovery in the `Parser`.
-    let found_delim = unmatched.found_delim?;
-    let mut spans = vec![unmatched.found_span];
-    if let Some(sp) = unmatched.unclosed_span {
-        spans.push(sp);
-    };
-    let err = psess.dcx().create_err(MismatchedClosingDelimiter {
-        spans,
-        delimiter: pprust::token_kind_to_string(&found_delim.as_close_token_kind()).to_string(),
-        unmatched: unmatched.found_span,
-        opening_candidate: unmatched.candidate_span,
-        unclosed: unmatched.unclosed_span,
-    });
-    Some(err)
+pub(crate) fn make_errors_for_mismatched_closing_delims<'psess>(
+    unmatcheds: &[UnmatchedDelim],
+    psess: &'psess ParseSess,
+) -> Vec<Diag<'psess>> {
+    unmatcheds
+        .iter()
+        .filter_map(|unmatched| {
+            // `None` here means an `Eof` was found. We already emit those errors elsewhere, we add them to
+            // `unmatched_delims` only for error recovery in the `Parser`.
+            let found_delim = unmatched.found_delim?;
+            let mut spans = vec![unmatched.found_span];
+            if let Some(sp) = unmatched.unclosed_span {
+                spans.push(sp);
+            };
+            let err = psess.dcx().create_err(MismatchedClosingDelimiter {
+                spans,
+                delimiter: pprust::token_kind_to_string(&found_delim.as_close_token_kind())
+                    .to_string(),
+                unmatched: unmatched.found_span,
+                opening_candidate: unmatched.candidate_span,
+                unclosed: unmatched.unclosed_span,
+            });
+            Some(err)
+        })
+        .collect()
 }

compiler/rustc_parse/src/lexer/mod.rs

@@ -1,4 +1,4 @@
-use diagnostics::make_unclosed_delims_error;
+use diagnostics::make_errors_for_mismatched_closing_delims;
 use rustc_ast::ast::{self, AttrStyle};
 use rustc_ast::token::{self, CommentKind, Delimiter, IdentIsRaw, Token, TokenKind};
 use rustc_ast::tokenstream::TokenStream;
@@ -71,27 +71,23 @@ pub(crate) fn lex_token_trees<'psess, 'src>(
     };
     let res = lexer.lex_token_trees(/* is_delimited */ false);
 
-    let mut unmatched_delims: Vec<_> = lexer
-        .diag_info
-        .unmatched_delims
-        .into_iter()
-        .filter_map(|unmatched_delim| make_unclosed_delims_error(unmatched_delim, psess))
-        .collect();
+    let mut unmatched_closing_delims: Vec<_> =
+        make_errors_for_mismatched_closing_delims(&lexer.diag_info.unmatched_delims, psess);
 
     match res {
         Ok((_open_spacing, stream)) => {
-            if unmatched_delims.is_empty() {
+            if unmatched_closing_delims.is_empty() {
                 Ok(stream)
             } else {
                 // Return error if there are unmatched delimiters or unclosed delimiters.
-                Err(unmatched_delims)
+                Err(unmatched_closing_delims)
             }
         }
         Err(errs) => {
             // We emit delimiter mismatch errors first, then emit the unclosing delimiter mismatch
             // because the delimiter mismatch is more likely to be the root cause of error
-            unmatched_delims.extend(errs);
-            Err(unmatched_delims)
+            unmatched_closing_delims.extend(errs);
+            Err(unmatched_closing_delims)
         }
     }
 }