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Add fast-path when computing the default visibility #131686

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Oct 16, 2024
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Add fast-path when computing the default visibility #131686

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7 changes: 7 additions & 0 deletions compiler/rustc_monomorphize/src/partitioning.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -119,6 +119,7 @@ use rustc_middle::util::Providers;
use rustc_session::CodegenUnits;
use rustc_session::config::{DumpMonoStatsFormat, SwitchWithOptPath};
use rustc_span::symbol::Symbol;
use rustc_target::spec::SymbolVisibility;
use tracing::debug;

use crate::collector::{self, MonoItemCollectionStrategy, UsageMap};
Expand Down Expand Up @@ -904,6 +905,11 @@ fn mono_item_visibility<'tcx>(
}

fn default_visibility(tcx: TyCtxt<'_>, id: DefId, is_generic: bool) -> Visibility {
// Fast-path to avoid expensive query call below
if tcx.sess.default_visibility() == SymbolVisibility::Interposable {
return Visibility::Default;
}

let export_level = if is_generic {
// Generic functions never have export-level C.
SymbolExportLevel::Rust
Expand All @@ -913,6 +919,7 @@ fn default_visibility(tcx: TyCtxt<'_>, id: DefId, is_generic: bool) -> Visibilit
_ => SymbolExportLevel::Rust,
}
};

match export_level {
// C-export level items remain at `Default` to allow C code to
// access and interpose them.
Expand Down
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