40ae34194c
detects redundant imports that can be eliminated. for #117772 : In order to facilitate review and modification, split the checking code and removing redundant imports code into two PR.
48 lines
1.6 KiB
Rust
48 lines
1.6 KiB
Rust
use super::*;
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use rustc_data_structures::captures::Captures;
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use rustc_middle::mir::coverage::*;
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use rustc_middle::mir::{Body, CoverageIdsInfo};
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use rustc_middle::query::Providers;
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use rustc_middle::ty::{self};
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/// A `query` provider for retrieving coverage information injected into MIR.
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pub(crate) fn provide(providers: &mut Providers) {
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providers.coverage_ids_info = |tcx, def_id| coverage_ids_info(tcx, def_id);
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}
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/// Query implementation for `coverage_ids_info`.
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fn coverage_ids_info<'tcx>(
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tcx: TyCtxt<'tcx>,
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instance_def: ty::InstanceDef<'tcx>,
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) -> CoverageIdsInfo {
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let mir_body = tcx.instance_mir(instance_def);
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let max_counter_id = all_coverage_in_mir_body(mir_body)
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.filter_map(|coverage| match coverage.kind {
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CoverageKind::CounterIncrement { id } => Some(id),
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_ => None,
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})
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.max()
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.unwrap_or(CounterId::START);
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CoverageIdsInfo { max_counter_id }
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}
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fn all_coverage_in_mir_body<'a, 'tcx>(
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body: &'a Body<'tcx>,
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) -> impl Iterator<Item = &'a Coverage> + Captures<'tcx> {
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body.basic_blocks.iter().flat_map(|bb_data| &bb_data.statements).filter_map(|statement| {
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match statement.kind {
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StatementKind::Coverage(box ref coverage) if !is_inlined(body, statement) => {
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Some(coverage)
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}
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_ => None,
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}
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})
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}
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fn is_inlined(body: &Body<'_>, statement: &Statement<'_>) -> bool {
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let scope_data = &body.source_scopes[statement.source_info.scope];
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scope_data.inlined.is_some() || scope_data.inlined_parent_scope.is_some()
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}
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