Rollup merge of #125921 - Zalathar:buckets, r=oli-obk

coverage: Carve out hole spans in a separate early pass

When extracting spans from MIR for use in coverage instrumentation, we sometimes need to identify *hole spans* (currently just closures), and carve up the other spans so that they don't overlap with holes.

This PR simplifies the main coverage-span-refiner by extracting the hole-carving process into a separate early pass. That pass produces a series of independent buckets, and we run the span-refiner on each bucket separately.

There is almost no difference in the resulting mappings, other than in some edge cases involving macros.

compiler/rustc_span/src/lib.rs

@@ -682,6 +682,13 @@ impl Span {
         if span.hi > other.hi { Some(span.with_lo(cmp::max(span.lo, other.hi))) } else { None }
     }
 
+    /// Returns `Some(span)`, where the end is trimmed by the start of `other`.
+    pub fn trim_end(self, other: Span) -> Option<Span> {
+        let span = self.data();
+        let other = other.data();
+        if span.lo < other.lo { Some(span.with_hi(cmp::min(span.hi, other.lo))) } else { None }
+    }
+
     /// Returns the source span -- this is either the supplied span, or the span for
     /// the macro callsite that expanded to it.
     pub fn source_callsite(self) -> Span {

compiler/rustc_span/src/tests.rs

@@ -42,3 +42,60 @@ fn test_normalize_newlines() {
     check("\r\r\n", "\r\n", &[2]);
     check("hello\rworld", "hello\rworld", &[]);
 }
+
+#[test]
+fn test_trim() {
+    let span = |lo: usize, hi: usize| {
+        Span::new(BytePos::from_usize(lo), BytePos::from_usize(hi), SyntaxContext::root(), None)
+    };
+
+    // Various positions, named for their relation to `start` and `end`.
+    let well_before = 1;
+    let before = 3;
+    let start = 5;
+    let mid = 7;
+    let end = 9;
+    let after = 11;
+    let well_after = 13;
+
+    // The resulting span's context should be that of `self`, not `other`.
+    let other = span(start, end).with_ctxt(SyntaxContext::from_u32(999));
+
+    // Test cases for `trim_end`.
+
+    assert_eq!(span(well_before, before).trim_end(other), Some(span(well_before, before)));
+    assert_eq!(span(well_before, start).trim_end(other), Some(span(well_before, start)));
+    assert_eq!(span(well_before, mid).trim_end(other), Some(span(well_before, start)));
+    assert_eq!(span(well_before, end).trim_end(other), Some(span(well_before, start)));
+    assert_eq!(span(well_before, after).trim_end(other), Some(span(well_before, start)));
+
+    assert_eq!(span(start, mid).trim_end(other), None);
+    assert_eq!(span(start, end).trim_end(other), None);
+    assert_eq!(span(start, after).trim_end(other), None);
+
+    assert_eq!(span(mid, end).trim_end(other), None);
+    assert_eq!(span(mid, after).trim_end(other), None);
+
+    assert_eq!(span(end, after).trim_end(other), None);
+
+    assert_eq!(span(after, well_after).trim_end(other), None);
+
+    // Test cases for `trim_start`.
+
+    assert_eq!(span(after, well_after).trim_start(other), Some(span(after, well_after)));
+    assert_eq!(span(end, well_after).trim_start(other), Some(span(end, well_after)));
+    assert_eq!(span(mid, well_after).trim_start(other), Some(span(end, well_after)));
+    assert_eq!(span(start, well_after).trim_start(other), Some(span(end, well_after)));
+    assert_eq!(span(before, well_after).trim_start(other), Some(span(end, well_after)));
+
+    assert_eq!(span(mid, end).trim_start(other), None);
+    assert_eq!(span(start, end).trim_start(other), None);
+    assert_eq!(span(before, end).trim_start(other), None);
+
+    assert_eq!(span(start, mid).trim_start(other), None);
+    assert_eq!(span(before, mid).trim_start(other), None);
+
+    assert_eq!(span(before, start).trim_start(other), None);
+
+    assert_eq!(span(well_before, before).trim_start(other), None);
+}