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coverage: Avoid getting extra unexpansion info when we don't need it 

These particular callers don't actually use the returned macro information, so
they can use a simpler span-unexpansion function that doesn't return it.
This commit is contained in:
Zalathar 2024-06-30 18:20:45 +10:00
parent 617de8cfb5
commit 6c33149055
2 changed files with 21 additions and 16 deletions
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9
compiler/rustc_mir_transform/src/coverage/mappings.rs
View File

@ -10,7 +10,7 @@ use rustc_span::Span;
use crate::coverage::graph::{BasicCoverageBlock, CoverageGraph, START_BCB};
use crate::coverage::spans::extract_refined_covspans;
use crate::coverage::unexpand::unexpand_into_body_span_with_visible_macro;
use crate::coverage::unexpand::unexpand_into_body_span;
use crate::coverage::ExtractedHirInfo;
/// Associates an ordinary executable code span with its corresponding BCB.
@ -201,8 +201,7 @@ pub(super) fn extract_branch_pairs(
if !raw_span.ctxt().outer_expn_data().is_root() {
return None;
}
let (span, _) =
unexpand_into_body_span_with_visible_macro(raw_span, hir_info.body_span)?;
let span = unexpand_into_body_span(raw_span, hir_info.body_span)?;
let bcb_from_marker =
|marker: BlockMarkerId| basic_coverage_blocks.bcb_from_bb(block_markers[marker]?);
@ -237,7 +236,7 @@ pub(super) fn extract_mcdc_mappings(
if !raw_span.ctxt().outer_expn_data().is_root() {
return None;
}
let (span, _) = unexpand_into_body_span_with_visible_macro(raw_span, body_span)?;
let span = unexpand_into_body_span(raw_span, body_span)?;
let true_bcb = bcb_from_marker(true_marker)?;
let false_bcb = bcb_from_marker(false_marker)?;
@ -260,7 +259,7 @@ pub(super) fn extract_mcdc_mappings(
mcdc_decisions.extend(branch_info.mcdc_decision_spans.iter().filter_map(
|decision: &mir::coverage::MCDCDecisionSpan| {
let (span, _) = unexpand_into_body_span_with_visible_macro(decision.span, body_span)?;
let span = unexpand_into_body_span(decision.span, body_span)?;
let end_bcbs = decision
.end_markers

28
compiler/rustc_mir_transform/src/coverage/unexpand.rs
View File

@ -1,12 +1,18 @@
use rustc_span::{ExpnKind, MacroKind, Span, Symbol};
/// Returns an extrapolated span (pre-expansion[^1]) corresponding to a range
/// within the function's body source. This span is guaranteed to be contained
/// within, or equal to, the `body_span`. If the extrapolated span is not
/// contained within the `body_span`, `None` is returned.
/// Walks through the expansion ancestors of `original_span` to find a span that
/// is contained in `body_span` and has the same [syntax context] as `body_span`.
pub(crate) fn unexpand_into_body_span(original_span: Span, body_span: Span) -> Option<Span> {
// Because we don't need to return any extra ancestor information,
// we can just delegate directly to `find_ancestor_inside_same_ctxt`.
original_span.find_ancestor_inside_same_ctxt(body_span)
}
/// Walks through the expansion ancestors of `original_span` to find a span that
/// is contained in `body_span` and has the same [syntax context] as `body_span`.
///
/// [^1]Expansions result from Rust syntax including macros, syntactic sugar,
/// etc.).
/// If the returned span represents a bang-macro invocation (e.g. `foo!(..)`),
/// the returned symbol will be the name of that macro (e.g. `foo`).
pub(crate) fn unexpand_into_body_span_with_visible_macro(
original_span: Span,
body_span: Span,
@ -24,15 +30,15 @@ pub(crate) fn unexpand_into_body_span_with_visible_macro(
}
/// Walks through the expansion ancestors of `original_span` to find a span that
/// is contained in `body_span` and has the same [`SyntaxContext`] as `body_span`.
/// is contained in `body_span` and has the same [syntax context] as `body_span`.
/// The ancestor that was traversed just before the matching span (if any) is
/// also returned.
///
/// For example, a return value of `Some((ancestor, Some(prev))` means that:
/// For example, a return value of `Some((ancestor, Some(prev)))` means that:
/// - `ancestor == original_span.find_ancestor_inside_same_ctxt(body_span)`
/// - `ancestor == prev.parent_callsite()`
/// - `prev.parent_callsite() == ancestor`
///
/// [`SyntaxContext`]: rustc_span::SyntaxContext
/// [syntax context]: rustc_span::SyntaxContext
fn unexpand_into_body_span_with_prev(
original_span: Span,
body_span: Span,
@ -45,7 +51,7 @@ fn unexpand_into_body_span_with_prev(
curr = curr.parent_callsite()?;
}
debug_assert_eq!(Some(curr), original_span.find_ancestor_in_same_ctxt(body_span));
debug_assert_eq!(Some(curr), original_span.find_ancestor_inside_same_ctxt(body_span));
if let Some(prev) = prev {
debug_assert_eq!(Some(curr), prev.parent_callsite());
}