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coverage: Hoist special handling of async function spans

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This sidesteps the normal span refinement code in cases where we know that we
are only dealing with the special signature span that represents having called
an async function.
This commit is contained in:
Zalathar 2024-01-16 22:07:21 +11:00
parent dd6d7f27e4
commit fde1702db8
2 changed files with 28 additions and 24 deletions
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28
compiler/rustc_mir_transform/src/coverage/spans.rs
View file

@ -3,7 +3,7 @@
use rustc_middle::mir;
use rustc_span::{BytePos, Span, DUMMY_SP};
use super::graph::{BasicCoverageBlock, CoverageGraph};
use crate::coverage::graph::{BasicCoverageBlock, CoverageGraph, START_BCB};
use crate::coverage::ExtractedHirInfo;
mod from_mir;
@ -46,13 +46,25 @@ pub(super) fn generate_coverage_spans(
) -> Option<CoverageSpans> {
let mut mappings = vec![];
let sorted_spans =
from_mir::mir_to_initial_sorted_coverage_spans(mir_body, hir_info, basic_coverage_blocks);
let coverage_spans = SpansRefiner::refine_sorted_spans(basic_coverage_blocks, sorted_spans);
mappings.extend(coverage_spans.into_iter().map(|CoverageSpan { bcb, span, .. }| {
// Each span produced by the generator represents an ordinary code region.
BcbMapping { kind: BcbMappingKind::Code(bcb), span }
}));
if hir_info.is_async_fn {
// An async function desugars into a function that returns a future,
// with the user code wrapped in a closure. Any spans in the desugared
// outer function will be unhelpful, so just keep the signature span
// and ignore all of the spans in the MIR body.
let span = hir_info.fn_sig_span;
mappings.push(BcbMapping { kind: BcbMappingKind::Code(START_BCB), span });
} else {
let sorted_spans = from_mir::mir_to_initial_sorted_coverage_spans(
mir_body,
hir_info,
basic_coverage_blocks,
);
let coverage_spans = SpansRefiner::refine_sorted_spans(basic_coverage_blocks, sorted_spans);
mappings.extend(coverage_spans.into_iter().map(|CoverageSpan { bcb, span, .. }| {
// Each span produced by the generator represents an ordinary code region.
BcbMapping { kind: BcbMappingKind::Code(bcb), span }
}));
}
if mappings.is_empty() {
return None;

24
compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
View file

@ -23,25 +23,17 @@ pub(super) fn mir_to_initial_sorted_coverage_spans(
hir_info: &ExtractedHirInfo,
basic_coverage_blocks: &CoverageGraph,
) -> Vec<CoverageSpan> {
let &ExtractedHirInfo { is_async_fn, fn_sig_span, body_span, .. } = hir_info;
let &ExtractedHirInfo { fn_sig_span, body_span, .. } = hir_info;
let mut initial_spans = vec![SpanFromMir::for_fn_sig(fn_sig_span)];
let mut initial_spans = vec![];
if is_async_fn {
// An async function desugars into a function that returns a future,
// with the user code wrapped in a closure. Any spans in the desugared
// outer function will be unhelpful, so just keep the signature span
// and ignore all of the spans in the MIR body.
} else {
for (bcb, bcb_data) in basic_coverage_blocks.iter_enumerated() {
initial_spans.extend(bcb_to_initial_coverage_spans(mir_body, body_span, bcb, bcb_data));
}
for (bcb, bcb_data) in basic_coverage_blocks.iter_enumerated() {
initial_spans.extend(bcb_to_initial_coverage_spans(mir_body, body_span, bcb, bcb_data));
}
// If no spans were extracted from the body, discard the signature span.
// FIXME: This preserves existing behavior; consider getting rid of it.
if initial_spans.len() == 1 {
initial_spans.clear();
}
// Only add the signature span if we found at least one span in the body.
if !initial_spans.is_empty() {
initial_spans.push(SpanFromMir::for_fn_sig(fn_sig_span));
}
initial_spans.sort_by(|a, b| basic_coverage_blocks.cmp_in_dominator_order(a.bcb, b.bcb));