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resolve: Pre-compute non-reexport module children

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Instead of repeating the same logic by walking HIR during metadata encoding.

The only difference is that we are no longer encoding `macro_rules` items, but we never currently need them as a part of this list.
They can be encoded separately if this need ever arises.

`module_reexports` is also un-querified, because I don't see any reasons to make it a query, only overhead.
This commit is contained in:
Vadim Petrochenkov 2023-04-10 19:07:57 +03:00
parent 9be9b5e09a
commit 7c40a6fb34
16 changed files with 72 additions and 99 deletions
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15
compiler/rustc_metadata/src/rmeta/decoder.rs
View File

@ -1,6 +1,7 @@
// Decoding metadata from a single crate's metadata
use crate::creader::{CStore, CrateMetadataRef};
use crate::rmeta::table::IsDefault;
use crate::rmeta::*;
use rustc_ast as ast;
@ -995,17 +996,11 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
fn get_mod_child(self, id: DefIndex, sess: &Session) -> ModChild {
let ident = self.item_ident(id, sess);
let kind = self.def_kind(id);
let def_id = self.local_def_id(id);
let res = Res::Def(kind, def_id);
let res = Res::Def(self.def_kind(id), self.local_def_id(id));
let vis = self.get_visibility(id);
let span = self.get_span(id, sess);
let macro_rules = match kind {
DefKind::Macro(..) => self.root.tables.is_macro_rules.get(self, id),
_ => false,
};
ModChild { ident, res, vis, span, macro_rules, reexport_chain: Default::default() }
ModChild { ident, res, vis, span, reexport_chain: Default::default() }
}
/// Iterates over all named children of the given module,
@ -1029,12 +1024,14 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
} else {
// Iterate over all children.
for child_index in self.root.tables.children.get(self, id).unwrap().decode(self) {
// FIXME: Do not encode RPITITs as a part of this list.
if self.root.tables.opt_rpitit_info.get(self, child_index).is_none() {
yield self.get_mod_child(child_index, sess);
}
}
if let Some(reexports) = self.root.tables.module_reexports.get(self, id) {
let reexports = self.root.tables.module_children_reexports.get(self, id);
if !reexports.is_default() {
for reexport in reexports.decode((self, sess)) {
yield reexport;
}

62
compiler/rustc_metadata/src/rmeta/encoder.rs
View File

@ -43,7 +43,6 @@ use std::borrow::Borrow;
use std::collections::hash_map::Entry;
use std::hash::Hash;
use std::io::{Read, Seek, Write};
use std::iter;
use std::num::NonZeroUsize;
use std::path::{Path, PathBuf};
@ -456,7 +455,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
}
fn encode_info_for_items(&mut self) {
self.encode_info_for_mod(CRATE_DEF_ID, self.tcx.hir().root_module());
self.encode_info_for_mod(CRATE_DEF_ID);
// Proc-macro crates only export proc-macro items, which are looked
// up using `proc_macro_data`
@ -1324,7 +1323,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
record!(self.tables.implied_predicates_of[def_id] <- self.tcx.implied_predicates_of(def_id));
}
if let DefKind::Enum | DefKind::Struct | DefKind::Union = def_kind {
self.encode_info_for_adt(def_id);
self.encode_info_for_adt(local_id);
}
if tcx.impl_method_has_trait_impl_trait_tys(def_id)
&& let Ok(table) = self.tcx.collect_return_position_impl_trait_in_trait_tys(def_id)
@ -1357,7 +1356,8 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
}
#[instrument(level = "trace", skip(self))]
fn encode_info_for_adt(&mut self, def_id: DefId) {
fn encode_info_for_adt(&mut self, local_def_id: LocalDefId) {
let def_id = local_def_id.to_def_id();
let tcx = self.tcx;
let adt_def = tcx.adt_def(def_id);
record!(self.tables.repr_options[def_id] <- adt_def.repr());
@ -1366,15 +1366,9 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
record!(self.tables.params_in_repr[def_id] <- params_in_repr);
if adt_def.is_enum() {
record_array!(self.tables.children[def_id] <- iter::from_generator(||
for variant in tcx.adt_def(def_id).variants() {
yield variant.def_id.index;
// Encode constructors which take a separate slot in value namespace.
if let Some(ctor_def_id) = variant.ctor_def_id() {
yield ctor_def_id.index;
}
}
));
let module_children = tcx.module_children_non_reexports(local_def_id);
record_array!(self.tables.children[def_id] <-
module_children.iter().map(|def_id| def_id.local_def_index));
} else {
// For non-enum, there is only one variant, and its def_id is the adt's.
debug_assert_eq!(adt_def.variants().len(), 1);
@ -1406,7 +1400,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
}
}
fn encode_info_for_mod(&mut self, local_def_id: LocalDefId, md: &hir::Mod<'_>) {
fn encode_info_for_mod(&mut self, local_def_id: LocalDefId) {
let tcx = self.tcx;
let def_id = local_def_id.to_def_id();
debug!("EncodeContext::encode_info_for_mod({:?})", def_id);
@ -1420,38 +1414,12 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
// Encode this here because we don't do it in encode_def_ids.
record!(self.tables.expn_that_defined[def_id] <- tcx.expn_that_defined(local_def_id));
} else {
record_array!(self.tables.children[def_id] <- iter::from_generator(|| {
for item_id in md.item_ids {
match tcx.hir().item(*item_id).kind {
// Foreign items are planted into their parent modules
// from name resolution point of view.
hir::ItemKind::ForeignMod { items, .. } => {
for foreign_item in items {
yield foreign_item.id.owner_id.def_id.local_def_index;
}
}
// Only encode named non-reexport children, reexports are encoded
// separately and unnamed items are not used by name resolution.
hir::ItemKind::ExternCrate(..) => continue,
hir::ItemKind::Struct(ref vdata, _) => {
yield item_id.owner_id.def_id.local_def_index;
// Encode constructors which take a separate slot in value namespace.
if let Some(ctor_def_id) = vdata.ctor_def_id() {
yield ctor_def_id.local_def_index;
}
}
_ if tcx.def_key(item_id.owner_id.to_def_id()).get_opt_name().is_some() => {
yield item_id.owner_id.def_id.local_def_index;
}
_ => continue,
}
}
}));
let non_reexports = tcx.module_children_non_reexports(local_def_id);
record_array!(self.tables.children[def_id] <-
non_reexports.iter().map(|def_id| def_id.local_def_index));
let reexports = tcx.module_reexports(local_def_id);
if !reexports.is_empty() {
record_array!(self.tables.module_reexports[def_id] <- reexports);
}
record_defaulted_array!(self.tables.module_children_reexports[def_id] <-
tcx.module_children_reexports(local_def_id));
}
}
@ -1668,8 +1636,8 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
self.tables.is_macro_rules.set(def_id.index, macro_def.macro_rules);
record!(self.tables.macro_definition[def_id] <- &*macro_def.body);
}
hir::ItemKind::Mod(ref m) => {
self.encode_info_for_mod(item.owner_id.def_id, m);
hir::ItemKind::Mod(..) => {
self.encode_info_for_mod(item.owner_id.def_id);
}
hir::ItemKind::OpaqueTy(ref opaque) => {
self.encode_explicit_item_bounds(def_id);

2
compiler/rustc_metadata/src/rmeta/mod.rs
View File

@ -357,6 +357,7 @@ define_tables! {
associated_types_for_impl_traits_in_associated_fn: Table<DefIndex, LazyArray<DefId>>,
opt_rpitit_info: Table<DefIndex, Option<LazyValue<ty::ImplTraitInTraitData>>>,
unused_generic_params: Table<DefIndex, UnusedGenericParams>,
module_children_reexports: Table<DefIndex, LazyArray<ModChild>>,
- optional:
attributes: Table<DefIndex, LazyArray<ast::Attribute>>,
@ -414,7 +415,6 @@ define_tables! {
assoc_container: Table<DefIndex, ty::AssocItemContainer>,
macro_definition: Table<DefIndex, LazyValue<ast::DelimArgs>>,
proc_macro: Table<DefIndex, MacroKind>,
module_reexports: Table<DefIndex, LazyArray<ModChild>>,
deduced_param_attrs: Table<DefIndex, LazyArray<DeducedParamAttrs>>,
trait_impl_trait_tys: Table<DefIndex, LazyValue<FxHashMap<DefId, Ty<'static>>>>,
doc_link_resolutions: Table<DefIndex, LazyValue<DocLinkResMap>>,

2
compiler/rustc_middle/src/metadata.rs
View File

@ -43,8 +43,6 @@ pub struct ModChild {
pub vis: ty::Visibility<DefId>,
/// Span of the item.
pub span: Span,
/// A proper `macro_rules` item (not a reexport).
pub macro_rules: bool,
/// Reexport chain linking this module child to its original reexported item.
/// Empty if the module child is a proper item.
pub reexport_chain: SmallVec<[Reexport; 2]>,

4
compiler/rustc_middle/src/query/mod.rs
View File

@ -1516,10 +1516,6 @@ rustc_queries! {
desc { "getting traits in scope at a block" }
}
query module_reexports(def_id: LocalDefId) -> &'tcx [ModChild] {
desc { |tcx| "looking up reexports of module `{}`", tcx.def_path_str(def_id.to_def_id()) }
}
query impl_defaultness(def_id: DefId) -> hir::Defaultness {
desc { |tcx| "looking up whether `{}` is a default impl", tcx.def_path_str(def_id) }
cache_on_disk_if { def_id.is_local() }

25
compiler/rustc_middle/src/ty/context.rs
View File

@ -8,6 +8,7 @@ use crate::arena::Arena;
use crate::dep_graph::{DepGraph, DepKindStruct};
use crate::infer::canonical::CanonicalVarInfo;
use crate::lint::struct_lint_level;
use crate::metadata::ModChild;
use crate::middle::codegen_fn_attrs::CodegenFnAttrs;
use crate::middle::resolve_bound_vars;
use crate::middle::stability;
@ -2459,6 +2460,28 @@ impl<'tcx> TyCtxt<'tcx> {
self.def_kind(def_id) == DefKind::ImplTraitPlaceholder
}
}
/// Named module children from all items except `use` and `extern crate` imports.
///
/// In addition to regular items this list also includes struct or variant constructors, and
/// items inside `extern {}` blocks because all of them introduce names into parent module.
/// For non-reexported children every such name is associated with a separate `DefId`.
///
/// Module here is understood in name resolution sense - it can be a `mod` item,
/// or a crate root, or an enum, or a trait.
pub fn module_children_non_reexports(self, def_id: LocalDefId) -> &'tcx [LocalDefId] {
self.resolutions(()).module_children_non_reexports.get(&def_id).map_or(&[], |v| &v[..])
}
/// Named module children from `use` and `extern crate` imports.
///
/// Reexported names are not associated with individual `DefId`s,
/// e.g. a glob import can introduce a lot of names, all with the same `DefId`.
/// That's why the list needs to contain `ModChild` structures describing all the names
/// individually instead of `DefId`s.
pub fn module_children_reexports(self, def_id: LocalDefId) -> &'tcx [ModChild] {
self.resolutions(()).module_children_reexports.get(&def_id).map_or(&[], |v| &v[..])
}
}
impl<'tcx> TyCtxtAt<'tcx> {
@ -2501,8 +2524,6 @@ pub struct DeducedParamAttrs {
}
pub fn provide(providers: &mut ty::query::Providers) {
providers.module_reexports =
|tcx, id| tcx.resolutions(()).reexport_map.get(&id).map_or(&[], |v| &v[..]);
providers.maybe_unused_trait_imports =
|tcx, ()| &tcx.resolutions(()).maybe_unused_trait_imports;
providers.names_imported_by_glob_use = |tcx, id| {

3
compiler/rustc_middle/src/ty/mod.rs
View File

@ -166,7 +166,8 @@ pub struct ResolverGlobalCtxt {
pub effective_visibilities: EffectiveVisibilities,
pub extern_crate_map: FxHashMap<LocalDefId, CrateNum>,
pub maybe_unused_trait_imports: FxIndexSet<LocalDefId>,
pub reexport_map: FxHashMap<LocalDefId, Vec<ModChild>>,
pub module_children_non_reexports: LocalDefIdMap<Vec<LocalDefId>>,
pub module_children_reexports: LocalDefIdMap<Vec<ModChild>>,
pub glob_map: FxHashMap<LocalDefId, FxHashSet<Symbol>>,
pub main_def: Option<MainDefinition>,
pub trait_impls: FxIndexMap<DefId, Vec<LocalDefId>>,

2
compiler/rustc_privacy/src/lib.rs
View File

@ -515,7 +515,7 @@ impl<'tcx> EmbargoVisitor<'tcx> {
let vis = self.tcx.local_visibility(item_id.owner_id.def_id);
self.update_macro_reachable_def(item_id.owner_id.def_id, def_kind, vis, defining_mod);
}
for export in self.tcx.module_reexports(module_def_id) {
for export in self.tcx.module_children_reexports(module_def_id) {
if export.vis.is_accessible_from(defining_mod, self.tcx)
&& let Res::Def(def_kind, def_id) = export.res
&& let Some(def_id) = def_id.as_local() {

6
compiler/rustc_resolve/src/build_reduced_graph.rs
View File

@ -931,7 +931,7 @@ impl<'a, 'b, 'tcx> BuildReducedGraphVisitor<'a, 'b, 'tcx> {
/// Builds the reduced graph for a single item in an external crate.
fn build_reduced_graph_for_external_crate_res(&mut self, child: ModChild) {
let parent = self.parent_scope.module;
let ModChild { ident, res, vis, span, macro_rules, .. } = child;
let ModChild { ident, res, vis, span, .. } = child;
let res = res.expect_non_local();
let expansion = self.parent_scope.expansion;
// Record primary definitions.
@ -964,9 +964,7 @@ impl<'a, 'b, 'tcx> BuildReducedGraphVisitor<'a, 'b, 'tcx> {
_,
) => self.r.define(parent, ident, ValueNS, (res, vis, span, expansion)),
Res::Def(DefKind::Macro(..), _) | Res::NonMacroAttr(..) => {
if !macro_rules {
self.r.define(parent, ident, MacroNS, (res, vis, span, expansion))
}
self.r.define(parent, ident, MacroNS, (res, vis, span, expansion))
}
Res::Def(
DefKind::TyParam

16
compiler/rustc_resolve/src/imports.rs
View File

@ -1261,10 +1261,14 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
*module.globs.borrow_mut() = Vec::new();
if let Some(def_id) = module.opt_def_id() {
let mut non_reexports = Vec::new();
let mut reexports = Vec::new();
module.for_each_child(self, |this, ident, _, binding| {
if let Some(res) = this.is_reexport(binding) {
let res = binding.res().expect_non_local();
if !binding.is_import() {
non_reexports.push(res.def_id().expect_local());
} else if res != def::Res::Err && !binding.is_ambiguity() {
let mut reexport_chain = SmallVec::new();
let mut next_binding = binding;
while let NameBindingKind::Import { binding, import, .. } = next_binding.kind {
@ -1277,16 +1281,18 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
res,
vis: binding.vis,
span: binding.span,
macro_rules: false,
reexport_chain,
});
}
});
// Should be fine because this code is only called for local modules.
let def_id = def_id.expect_local();
if !non_reexports.is_empty() {
self.module_children_non_reexports.insert(def_id, non_reexports);
}
if !reexports.is_empty() {
// Call to `expect_local` should be fine because current
// code is only called for local modules.
self.reexport_map.insert(def_id.expect_local(), reexports);
self.module_children_reexports.insert(def_id, reexports);
}
}
}

24
compiler/rustc_resolve/src/lib.rs
View File

@ -910,7 +910,8 @@ pub struct Resolver<'a, 'tcx> {
/// `CrateNum` resolutions of `extern crate` items.
extern_crate_map: FxHashMap<LocalDefId, CrateNum>,
reexport_map: FxHashMap<LocalDefId, Vec<ModChild>>,
module_children_non_reexports: LocalDefIdMap<Vec<LocalDefId>>,
module_children_reexports: LocalDefIdMap<Vec<ModChild>>,
trait_map: NodeMap<Vec<TraitCandidate>>,
/// A map from nodes to anonymous modules.
@ -1260,7 +1261,8 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
lifetimes_res_map: Default::default(),
extra_lifetime_params_map: Default::default(),
extern_crate_map: Default::default(),
reexport_map: FxHashMap::default(),
module_children_non_reexports: Default::default(),
module_children_reexports: Default::default(),
trait_map: NodeMap::default(),
underscore_disambiguator: 0,
empty_module,
@ -1387,7 +1389,6 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
let visibilities = self.visibilities;
let has_pub_restricted = self.has_pub_restricted;
let extern_crate_map = self.extern_crate_map;
let reexport_map = self.reexport_map;
let maybe_unused_trait_imports = self.maybe_unused_trait_imports;
let glob_map = self.glob_map;
let main_def = self.main_def;
@ -1399,7 +1400,8 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
has_pub_restricted,
effective_visibilities,
extern_crate_map,
reexport_map,
module_children_non_reexports: self.module_children_non_reexports,
module_children_reexports: self.module_children_reexports,
glob_map,
maybe_unused_trait_imports,
main_def,
@ -1950,20 +1952,6 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
}
self.main_def = Some(MainDefinition { res, is_import, span });
}
// Items that go to reexport table encoded to metadata and visible through it to other crates.
fn is_reexport(&self, binding: &NameBinding<'a>) -> Option<def::Res<!>> {
if binding.is_import() {
let res = binding.res().expect_non_local();
// Ambiguous imports are treated as errors at this point and are
// not exposed to other crates (see #36837 for more details).
if res != def::Res::Err && !binding.is_ambiguity() {
return Some(res);
}
}
return None;
}
}
fn names_to_string(names: &[Symbol]) -> String {

2
src/librustdoc/clean/inline.rs
View File

@ -152,7 +152,7 @@ pub(crate) fn try_inline_glob(
// reexported by the glob, e.g. because they are shadowed by something else.
let reexports = cx
.tcx
.module_reexports(current_mod)
.module_children_reexports(current_mod)
.iter()
.filter_map(|child| child.res.opt_def_id())
.collect();

2
src/librustdoc/clean/mod.rs
View File

@ -2062,7 +2062,7 @@ pub(crate) fn reexport_chain<'tcx>(
import_def_id: LocalDefId,
target_def_id: LocalDefId,
) -> &'tcx [Reexport] {
for child in tcx.module_reexports(tcx.local_parent(import_def_id)) {
for child in tcx.module_children_reexports(tcx.local_parent(import_def_id)) {
if child.res.opt_def_id() == Some(target_def_id.to_def_id())
&& child.reexport_chain[0].id() == Some(import_def_id.to_def_id())
{

2
src/librustdoc/visit_ast.rs
View File

@ -133,7 +133,7 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
// is declared but also a reexport of itself producing two exports of the same
// macro in the same module.
let mut inserted = FxHashSet::default();
for export in self.cx.tcx.module_reexports(CRATE_DEF_ID) {
for export in self.cx.tcx.module_children_reexports(CRATE_DEF_ID) {
if let Res::Def(DefKind::Macro(_), def_id) = export.res &&
let Some(local_def_id) = def_id.as_local() &&
self.cx.tcx.has_attr(def_id, sym::macro_export) &&

2
src/tools/clippy/tests/ui/macro_use_imports.fixed
View File

@ -16,7 +16,7 @@ extern crate macro_use_helper as mac;
extern crate proc_macro_derive as mini_mac;
mod a {
use mac::{pub_macro, function_macro, ty_macro, inner_mod_macro, pub_in_private_macro};
use mac::{pub_macro, inner_mod_macro, function_macro, ty_macro, pub_in_private_macro};
use mac;
use mini_mac::ClippyMiniMacroTest;
use mini_mac;

2
src/tools/clippy/tests/ui/macro_use_imports.stderr
View File

@ -22,7 +22,7 @@ error: `macro_use` attributes are no longer needed in the Rust 2018 edition
--> $DIR/macro_use_imports.rs:19:5
|
LL | #[macro_use]
| ^^^^^^^^^^^^ help: remove the attribute and import the macro directly, try: `use mac::{pub_macro, function_macro, ty_macro, inner_mod_macro, pub_in_private_macro};`
| ^^^^^^^^^^^^ help: remove the attribute and import the macro directly, try: `use mac::{pub_macro, inner_mod_macro, function_macro, ty_macro, pub_in_private_macro};`
error: aborting due to 4 previous errors