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Auto merge of #93466 - cjgillot:query-dead, r=nagisa

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Make dead code check a query.

Dead code check is run for each invocation of the compiler, even if no modifications were involved.
This PR makes dead code check a query keyed on the module. This allows to skip the check when a module has not changed.
To perform this, a query `live_symbols_and_ignored_derived_traits` is introduced to encapsulate the global analysis of finding live symbols. The second query `check_mod_deathness` outputs diagnostics for each module based on this first query's results.
This commit is contained in:
bors 2022-02-02 02:29:32 +00:00
commit d5f9c40e6a
5 changed files with 62 additions and 33 deletions
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3
compiler/rustc_interface/src/passes.rs
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@ -999,7 +999,8 @@ fn analysis(tcx: TyCtxt<'_>, (): ()) -> Result<()> {
tcx.ensure().check_private_in_public(());
},
{
sess.time("death_checking", || rustc_passes::dead::check_crate(tcx));
tcx.hir()
.par_for_each_module(|module| tcx.ensure().check_mod_deathness(module));
},
{
sess.time("unused_lib_feature_checking", || {