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Unbox and unwrap the contents of StatementKind::Coverage

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The payload of coverage statements was historically a structure with several
fields, so it was boxed to avoid bloating `StatementKind`.

Now that the payload is a single relatively-small enum, we can replace
`Box<Coverage>` with just `CoverageKind`.

This patch also adds a size assertion for `StatementKind`, to avoid
accidentally bloating it in the future.
This commit is contained in:
Zalathar 2024-03-23 19:13:52 +11:00
parent c3b05c6e5b
commit ab92699f4a
15 changed files with 44 additions and 68 deletions
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34
compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
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@ -187,9 +187,7 @@ fn filtered_statement_span(statement: &Statement<'_>) -> Option<Span> {
// for their parent `BasicBlock`.
StatementKind::StorageLive(_)
| StatementKind::StorageDead(_)
// Ignore `ConstEvalCounter`s
| StatementKind::ConstEvalCounter
// Ignore `Nop`s
| StatementKind::Nop => None,
// FIXME(#78546): MIR InstrumentCoverage - Can the source_info.span for `FakeRead`
@ -211,30 +209,28 @@ fn filtered_statement_span(statement: &Statement<'_>) -> Option<Span> {
StatementKind::FakeRead(box (FakeReadCause::ForGuardBinding, _)) => None,
// Retain spans from most other statements.
StatementKind::FakeRead(box (_, _)) // Not including `ForGuardBinding`
StatementKind::FakeRead(_)
| StatementKind::Intrinsic(..)
| StatementKind::Coverage(box mir::Coverage {
| StatementKind::Coverage(
// The purpose of `SpanMarker` is to be matched and accepted here.
kind: CoverageKind::SpanMarker
})
CoverageKind::SpanMarker,
)
| StatementKind::Assign(_)
| StatementKind::SetDiscriminant { .. }
| StatementKind::Deinit(..)
| StatementKind::Retag(_, _)
| StatementKind::PlaceMention(..)
| StatementKind::AscribeUserType(_, _) => {
Some(statement.source_info.span)
}
| StatementKind::AscribeUserType(_, _) => Some(statement.source_info.span),
StatementKind::Coverage(box mir::Coverage {
// Block markers are used for branch coverage, so ignore them here.
kind: CoverageKind::BlockMarker {..}
}) => None,
// Block markers are used for branch coverage, so ignore them here.
StatementKind::Coverage(CoverageKind::BlockMarker { .. }) => None,
StatementKind::Coverage(box mir::Coverage {
// These coverage statements should not exist prior to coverage instrumentation.
kind: CoverageKind::CounterIncrement { .. } | CoverageKind::ExpressionUsed { .. }
}) => bug!("Unexpected coverage statement found during coverage instrumentation: {statement:?}"),
// These coverage statements should not exist prior to coverage instrumentation.
StatementKind::Coverage(
CoverageKind::CounterIncrement { .. } | CoverageKind::ExpressionUsed { .. },
) => bug!(
"Unexpected coverage statement found during coverage instrumentation: {statement:?}"
),
}
}
@ -382,9 +378,7 @@ pub(super) fn extract_branch_mappings(
// Fill out the mapping from block marker IDs to their enclosing blocks.
for (bb, data) in mir_body.basic_blocks.iter_enumerated() {
for statement in &data.statements {
if let StatementKind::Coverage(coverage) = &statement.kind
&& let CoverageKind::BlockMarker { id } = coverage.kind
{
if let StatementKind::Coverage(CoverageKind::BlockMarker { id }) = statement.kind {
block_markers[id] = Some(bb);
}
}