bjoernager/rust
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coverage: Add CoverageKind::SpanMarker for including extra spans in MIR

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There are cases where coverage instrumentation wants to show a span for some
syntax element, but there is no MIR node that naturally carries that span, so
the instrumentor can't see it.

MIR building can now use this new kind of coverage statement to deliberately
include those spans in MIR, attached to a dummy statement that has no other
effect.
This commit is contained in:
Zalathar 2023-11-23 11:50:39 +11:00
parent d2d742c4cc
commit 44b47aa976
4 changed files with 36 additions and 3 deletions
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13
compiler/rustc_mir_build/src/build/cfg.rs
View file

@ -101,6 +101,19 @@ impl<'tcx> CFG<'tcx> {
self.push(block, stmt);
}
/// Adds a dummy statement whose only role is to associate a span with its
/// enclosing block for the purposes of coverage instrumentation.
///
/// This results in more accurate coverage reports for certain kinds of
/// syntax (e.g. `continue` or `if !`) that would otherwise not appear in MIR.
pub(crate) fn push_coverage_span_marker(&mut self, block: BasicBlock, source_info: SourceInfo) {
let kind = StatementKind::Coverage(Box::new(Coverage {
kind: coverage::CoverageKind::SpanMarker,
}));
let stmt = Statement { source_info, kind };
self.push(block, stmt);
}
pub(crate) fn terminate(
&mut self,
block: BasicBlock,