Auto merge of #119648 - compiler-errors:rollup-42inxd8, r=compiler-er…

…rors

Rollup of 9 pull requests

Successful merges:

 - #119208 (coverage: Hoist some complex code out of the main span refinement loop)
 - #119216 (Use diagnostic namespace in stdlib)
 - #119414 (bootstrap: Move -Clto= setting from Rustc::run to rustc_cargo)
 - #119420 (Handle ForeignItem as TAIT scope.)
 - #119468 (rustdoc-search: tighter encoding for f index)
 - #119628 (remove duplicate test)
 - #119638 (fix cyle error when suggesting to use associated function instead of constructor)
 - #119640 (library: Fix warnings in rtstartup)
 - #119642 (library: Fix a symlink test failing on Windows)

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_hir_analysis/src/collect/type_of/opaque.rs

@@ -69,6 +69,7 @@ pub(super) fn find_opaque_ty_constraints_for_tait(tcx: TyCtxt<'_>, def_id: Local
             Node::Item(it) => locator.visit_item(it),
             Node::ImplItem(it) => locator.visit_impl_item(it),
             Node::TraitItem(it) => locator.visit_trait_item(it),
+            Node::ForeignItem(it) => locator.visit_foreign_item(it),
             other => bug!("{:?} is not a valid scope for an opaque type item", other),
         }
     }
@@ -240,6 +241,12 @@ impl<'tcx> intravisit::Visitor<'tcx> for TaitConstraintLocator<'tcx> {
         self.check(it.owner_id.def_id);
         intravisit::walk_trait_item(self, it);
     }
+    fn visit_foreign_item(&mut self, it: &'tcx hir::ForeignItem<'tcx>) {
+        trace!(?it.owner_id);
+        assert_ne!(it.owner_id.def_id, self.def_id);
+        // No need to call `check`, as we do not run borrowck on foreign items.
+        intravisit::walk_foreign_item(self, it);
+    }
 }
 
 pub(super) fn find_opaque_ty_constraints_for_rpit<'tcx>(

compiler/rustc_middle/src/ty/instance.rs

@@ -293,12 +293,16 @@ impl<'tcx> InstanceDef<'tcx> {
 fn fmt_instance(
     f: &mut fmt::Formatter<'_>,
     instance: &Instance<'_>,
-    type_length: rustc_session::Limit,
+    type_length: Option<rustc_session::Limit>,
 ) -> fmt::Result {
     ty::tls::with(|tcx| {
         let args = tcx.lift(instance.args).expect("could not lift for printing");
 
-        let mut cx = FmtPrinter::new_with_limit(tcx, Namespace::ValueNS, type_length);
+        let mut cx = if let Some(type_length) = type_length {
+            FmtPrinter::new_with_limit(tcx, Namespace::ValueNS, type_length)
+        } else {
+            FmtPrinter::new(tcx, Namespace::ValueNS)
+        };
         cx.print_def_path(instance.def_id(), args)?;
         let s = cx.into_buffer();
         f.write_str(&s)
@@ -324,13 +328,13 @@ pub struct ShortInstance<'a, 'tcx>(pub &'a Instance<'tcx>, pub usize);
 
 impl<'a, 'tcx> fmt::Display for ShortInstance<'a, 'tcx> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        fmt_instance(f, self.0, rustc_session::Limit(self.1))
+        fmt_instance(f, self.0, Some(rustc_session::Limit(self.1)))
     }
 }
 
 impl<'tcx> fmt::Display for Instance<'tcx> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        ty::tls::with(|tcx| fmt_instance(f, self, tcx.type_length_limit()))
+        fmt_instance(f, self, None)
     }
 }
 

compiler/rustc_mir_transform/src/coverage/spans.rs

@@ -1,11 +1,9 @@
-use std::cell::OnceCell;
-
 use rustc_data_structures::graph::WithNumNodes;
 use rustc_index::IndexVec;
 use rustc_middle::mir;
-use rustc_span::{BytePos, ExpnKind, MacroKind, Span, Symbol, DUMMY_SP};
+use rustc_span::{BytePos, Span, DUMMY_SP};
 
-use super::graph::{BasicCoverageBlock, CoverageGraph, START_BCB};
+use super::graph::{BasicCoverageBlock, CoverageGraph};
 use crate::coverage::ExtractedHirInfo;
 
 mod from_mir;
@@ -70,35 +68,17 @@ impl CoverageSpans {
 /// `dominates()` the `BasicBlock`s in this `CoverageSpan`.
 #[derive(Debug, Clone)]
 struct CoverageSpan {
-    pub span: Span,
-    pub expn_span: Span,
-    pub current_macro_or_none: OnceCell<Option<Symbol>>,
-    pub bcb: BasicCoverageBlock,
+    span: Span,
+    bcb: BasicCoverageBlock,
     /// List of all the original spans from MIR that have been merged into this
     /// span. Mainly used to precisely skip over gaps when truncating a span.
-    pub merged_spans: Vec<Span>,
-    pub is_closure: bool,
+    merged_spans: Vec<Span>,
+    is_closure: bool,
 }
 
 impl CoverageSpan {
-    pub fn for_fn_sig(fn_sig_span: Span) -> Self {
-        Self::new(fn_sig_span, fn_sig_span, START_BCB, false)
-    }
-
-    pub(super) fn new(
-        span: Span,
-        expn_span: Span,
-        bcb: BasicCoverageBlock,
-        is_closure: bool,
-    ) -> Self {
-        Self {
-            span,
-            expn_span,
-            current_macro_or_none: Default::default(),
-            bcb,
-            merged_spans: vec![span],
-            is_closure,
-        }
+    fn new(span: Span, bcb: BasicCoverageBlock, is_closure: bool) -> Self {
+        Self { span, bcb, merged_spans: vec![span], is_closure }
     }
 
     pub fn merge_from(&mut self, other: &Self) {
@@ -123,37 +103,6 @@ impl CoverageSpan {
     pub fn is_in_same_bcb(&self, other: &Self) -> bool {
         self.bcb == other.bcb
     }
-
-    /// If the span is part of a macro, returns the macro name symbol.
-    pub fn current_macro(&self) -> Option<Symbol> {
-        self.current_macro_or_none
-            .get_or_init(|| {
-                if let ExpnKind::Macro(MacroKind::Bang, current_macro) =
-                    self.expn_span.ctxt().outer_expn_data().kind
-                {
-                    return Some(current_macro);
-                }
-                None
-            })
-            .map(|symbol| symbol)
-    }
-
-    /// If the span is part of a macro, and the macro is visible (expands directly to the given
-    /// body_span), returns the macro name symbol.
-    pub fn visible_macro(&self, body_span: Span) -> Option<Symbol> {
-        let current_macro = self.current_macro()?;
-        let parent_callsite = self.expn_span.parent_callsite()?;
-
-        // In addition to matching the context of the body span, the parent callsite
-        // must also be the source callsite, i.e. the parent must have no parent.
-        let is_visible_macro =
-            parent_callsite.parent_callsite().is_none() && parent_callsite.eq_ctxt(body_span);
-        is_visible_macro.then_some(current_macro)
-    }
-
-    pub fn is_macro_expansion(&self) -> bool {
-        self.current_macro().is_some()
-    }
 }
 
 /// Converts the initial set of `CoverageSpan`s (one per MIR `Statement` or `Terminator`) into a
@@ -164,10 +113,6 @@ impl CoverageSpan {
 ///    execution
 ///  * Carve out (leave uncovered) any span that will be counted by another MIR (notably, closures)
 struct CoverageSpansGenerator<'a> {
-    /// A `Span` covering the function body of the MIR (typically from left curly brace to right
-    /// curly brace).
-    body_span: Span,
-
     /// The BasicCoverageBlock Control Flow Graph (BCB CFG).
     basic_coverage_blocks: &'a CoverageGraph,
 
@@ -244,7 +189,6 @@ impl<'a> CoverageSpansGenerator<'a> {
         );
 
         let coverage_spans = Self {
-            body_span: hir_info.body_span,
             basic_coverage_blocks,
             sorted_spans_iter: sorted_spans.into_iter(),
             some_curr: None,
@@ -266,7 +210,6 @@ impl<'a> CoverageSpansGenerator<'a> {
             // span-processing steps don't make sense yet.
             if self.some_prev.is_none() {
                 debug!("  initial span");
-                self.maybe_push_macro_name_span();
                 continue;
             }
 
@@ -278,15 +221,13 @@ impl<'a> CoverageSpansGenerator<'a> {
                 debug!("  same bcb (and neither is a closure), merge with prev={prev:?}");
                 let prev = self.take_prev();
                 self.curr_mut().merge_from(&prev);
-                self.maybe_push_macro_name_span();
             // Note that curr.span may now differ from curr_original_span
             } else if prev.span.hi() <= curr.span.lo() {
                 debug!(
                     "  different bcbs and disjoint spans, so keep curr for next iter, and add prev={prev:?}",
                 );
                 let prev = self.take_prev();
                 self.refined_spans.push(prev);
-                self.maybe_push_macro_name_span();
             } else if prev.is_closure {
                 // drop any equal or overlapping span (`curr`) and keep `prev` to test again in the
                 // next iter
@@ -297,35 +238,11 @@ impl<'a> CoverageSpansGenerator<'a> {
             } else if curr.is_closure {
                 self.carve_out_span_for_closure();
             } else if self.prev_original_span == curr.span {
-                // Note that this compares the new (`curr`) span to `prev_original_span`.
-                // In this branch, the actual span byte range of `prev_original_span` is not
-                // important. What is important is knowing whether the new `curr` span was
-                // **originally** the same as the original span of `prev()`. The original spans
-                // reflect their original sort order, and for equal spans, conveys a partial
-                // ordering based on CFG dominator priority.
-                if prev.is_macro_expansion() && curr.is_macro_expansion() {
-                    // Macros that expand to include branching (such as
-                    // `assert_eq!()`, `assert_ne!()`, `info!()`, `debug!()`, or
-                    // `trace!()`) typically generate callee spans with identical
-                    // ranges (typically the full span of the macro) for all
-                    // `BasicBlocks`. This makes it impossible to distinguish
-                    // the condition (`if val1 != val2`) from the optional
-                    // branched statements (such as the call to `panic!()` on
-                    // assert failure). In this case it is better (or less
-                    // worse) to drop the optional branch bcbs and keep the
-                    // non-conditional statements, to count when reached.
-                    debug!(
-                        "  curr and prev are part of a macro expansion, and curr has the same span \
-                        as prev, but is in a different bcb. Drop curr and keep prev for next iter. \
-                        prev={prev:?}",
-                    );
-                    self.take_curr(); // Discards curr.
-                } else {
-                    self.update_pending_dups();
-                }
+                // `prev` and `curr` have the same span, or would have had the
+                // same span before `prev` was modified by other spans.
+                self.update_pending_dups();
             } else {
                 self.cutoff_prev_at_overlapping_curr();
-                self.maybe_push_macro_name_span();
             }
         }
 
@@ -360,41 +277,6 @@ impl<'a> CoverageSpansGenerator<'a> {
         self.refined_spans
     }
 
-    /// If `curr` is part of a new macro expansion, carve out and push a separate
-    /// span that ends just after the macro name and its subsequent `!`.
-    fn maybe_push_macro_name_span(&mut self) {
-        let curr = self.curr();
-
-        let Some(visible_macro) = curr.visible_macro(self.body_span) else { return };
-        if let Some(prev) = &self.some_prev
-            && prev.expn_span.eq_ctxt(curr.expn_span)
-        {
-            return;
-        }
-
-        // The split point is relative to `curr_original_span`,
-        // because `curr.span` may have been merged with preceding spans.
-        let split_point_after_macro_bang = self.curr_original_span.lo()
-            + BytePos(visible_macro.as_str().len() as u32)
-            + BytePos(1); // add 1 for the `!`
-        debug_assert!(split_point_after_macro_bang <= curr.span.hi());
-        if split_point_after_macro_bang > curr.span.hi() {
-            // Something is wrong with the macro name span;
-            // return now to avoid emitting malformed mappings (e.g. #117788).
-            return;
-        }
-
-        let mut macro_name_cov = curr.clone();
-        macro_name_cov.span = macro_name_cov.span.with_hi(split_point_after_macro_bang);
-        self.curr_mut().span = curr.span.with_lo(split_point_after_macro_bang);
-
-        debug!(
-            "  and curr starts a new macro expansion, so add a new span just for \
-            the macro `{visible_macro}!`, new span={macro_name_cov:?}",
-        );
-        self.refined_spans.push(macro_name_cov);
-    }
-
     #[track_caller]
     fn curr(&self) -> &CoverageSpan {
         self.some_curr.as_ref().unwrap_or_else(|| bug!("some_curr is None (curr)"))