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coverage: Hoist and explain the check for coverage_cx

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This commit is contained in:
Zalathar 2024-11-23 14:21:33 +11:00
parent 3f65114ffc
commit 58e122fef8
1 changed files with 14 additions and 11 deletions
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25
compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs
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@ -143,6 +143,13 @@ impl<'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'_, '_, 'tcx> {
let bx = self;
// Due to LocalCopy instantiation or MIR inlining, coverage statements
// can end up in a crate that isn't doing coverage instrumentation.
// When that happens, we currently just discard those statements, so
// the corresponding code will be undercounted.
// FIXME(Zalathar): Find a better solution for mixed-coverage builds.
let Some(coverage_cx) = &bx.cx.coverage_cx else { return };
let Some(function_coverage_info) =
bx.tcx.instance_mir(instance.def).function_coverage_info.as_deref()
else {
@ -150,12 +157,7 @@ impl<'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'_, '_, 'tcx> {
return;
};
// FIXME(#132395): Unwrapping `coverage_cx` here has led to ICEs in the
// wild, so keep this early-return until we understand why.
let mut coverage_map = match bx.coverage_cx {
Some(ref cx) => cx.function_coverage_map.borrow_mut(),
None => return,
};
let mut coverage_map = coverage_cx.function_coverage_map.borrow_mut();
let func_coverage = coverage_map
.entry(instance)
.or_insert_with(|| FunctionCoverageCollector::new(instance, function_coverage_info));
@ -197,8 +199,7 @@ impl<'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'_, '_, 'tcx> {
}
CoverageKind::CondBitmapUpdate { index, decision_depth } => {
drop(coverage_map);
let cond_bitmap = bx
.coverage_cx()
let cond_bitmap = coverage_cx
.try_get_mcdc_condition_bitmap(&instance, decision_depth)
.expect("mcdc cond bitmap should have been allocated for updating");
let cond_index = bx.const_i32(index as i32);
@ -206,9 +207,11 @@ impl<'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'_, '_, 'tcx> {
}
CoverageKind::TestVectorBitmapUpdate { bitmap_idx, decision_depth } => {
drop(coverage_map);
let cond_bitmap = bx.coverage_cx()
.try_get_mcdc_condition_bitmap(&instance, decision_depth)
.expect("mcdc cond bitmap should have been allocated for merging into the global bitmap");
let cond_bitmap =
coverage_cx.try_get_mcdc_condition_bitmap(&instance, decision_depth).expect(
"mcdc cond bitmap should have been allocated for merging \
into the global bitmap",
);
assert!(
bitmap_idx as usize <= function_coverage_info.mcdc_bitmap_bits,
"bitmap index of the decision out of range"