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Auto merge of #93511 - cjgillot:query-copy, r=oli-obk

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Ensure that queries only return Copy types.

This should pervent the perf footgun of returning a result with an expensive `Clone` impl (like a `Vec` of a hash map).

I went for the stupid solution of allocating on an arena everything that was not `Copy`. Some query results could be made Copy easily, but I did not really investigate.
This commit is contained in:
bors
2022-02-10 09:37:07 +00:00
parent 5d6ee0db96 8edd32c940
commit 56cd04af5c
27 changed files with 208 additions and 182 deletions
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12
compiler/rustc_middle/src/ty/context.rs
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@@ -5,7 +5,7 @@ use crate::dep_graph::{DepGraph, DepKind, DepKindStruct};
use crate::hir::place::Place as HirPlace;
use crate::infer::canonical::{Canonical, CanonicalVarInfo, CanonicalVarInfos};
use crate::lint::{struct_lint_level, LintDiagnosticBuilder, LintLevelSource};
use crate::middle::resolve_lifetime::{self, LifetimeScopeForPath, ObjectLifetimeDefault};
use crate::middle::resolve_lifetime::{self, LifetimeScopeForPath};
use crate::middle::stability;
use crate::mir::interpret::{self, Allocation, ConstValue, Scalar};
use crate::mir::{Body, Field, Local, Place, PlaceElem, ProjectionKind, Promoted};
@@ -2713,10 +2713,6 @@ impl<'tcx> TyCtxt<'tcx> {
.map_or(false, |(owner, set)| owner == id.owner && set.contains(&id.local_id))
}
pub fn object_lifetime_defaults(self, id: HirId) -> Option<Vec<ObjectLifetimeDefault>> {
self.object_lifetime_defaults_map(id.owner)
}
pub fn late_bound_vars(self, id: HirId) -> &'tcx List<ty::BoundVariableKind> {
self.mk_bound_variable_kinds(
self.late_bound_vars_map(id.owner)
@@ -2728,8 +2724,8 @@ impl<'tcx> TyCtxt<'tcx> {
)
}
pub fn lifetime_scope(self, id: HirId) -> Option<LifetimeScopeForPath> {
self.lifetime_scope_map(id.owner).and_then(|mut map| map.remove(&id.local_id))
pub fn lifetime_scope(self, id: HirId) -> Option<&'tcx LifetimeScopeForPath> {
self.lifetime_scope_map(id.owner).as_ref().and_then(|map| map.get(&id.local_id))
}
/// Whether the `def_id` counts as const fn in the current crate, considering all active
@@ -2902,7 +2898,7 @@ pub fn provide(providers: &mut ty::query::Providers) {
|tcx, id| tcx.stability().local_deprecation_entry(id.expect_local());
providers.extern_mod_stmt_cnum =
|tcx, id| tcx.resolutions(()).extern_crate_map.get(&id).cloned();
providers.output_filenames = |tcx, ()| tcx.output_filenames.clone();
providers.output_filenames = |tcx, ()| &tcx.output_filenames;
providers.features_query = |tcx, ()| tcx.sess.features_untracked();
providers.is_panic_runtime = |tcx, cnum| {
assert_eq!(cnum, LOCAL_CRATE);