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Use log level to control partitioning debug output #82498

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Feb 28, 2021
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Use log level to control partitioning debug output #82498

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21 changes: 15 additions & 6 deletions compiler/rustc_mir/src/monomorphize/partitioning/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -239,17 +239,22 @@ where
I: Iterator<Item = &'a CodegenUnit<'tcx>>,
'tcx: 'a,
{
if cfg!(debug_assertions) {
debug!("{}", label);
let dump = move || {
use std::fmt::Write;

let s = &mut String::new();
let _ = writeln!(s, "{}", label);
for cgu in cgus {
debug!("CodegenUnit {} estimated size {} :", cgu.name(), cgu.size_estimate());
let _ =
writeln!(s, "CodegenUnit {} estimated size {} :", cgu.name(), cgu.size_estimate());

for (mono_item, linkage) in cgu.items() {
let symbol_name = mono_item.symbol_name(tcx).name;
let symbol_hash_start = symbol_name.rfind('h');
let symbol_hash = symbol_hash_start.map_or("<no hash>", |i| &symbol_name[i..]);

debug!(
let _ = writeln!(
s,
" - {} [{:?}] [{}] estimated size {}",
mono_item,
linkage,
Expand All @@ -258,9 +263,13 @@ where
);
}

debug!("");
let _ = writeln!(s, "");
}
}

std::mem::take(s)
};

debug!("{}", dump());
}

#[inline(never)] // give this a place in the profiler
Expand Down