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Auto merge of #119192 - michaelwoerister:mcp533-push, r=cjgillot

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Replace a number of FxHashMaps/Sets with stable-iteration-order alternatives

This PR replaces almost all of the remaining `FxHashMap`s in query results with either `FxIndexMap` or `UnordMap`. The only case that is missing is the `EffectiveVisibilities` struct which turned out to not be straightforward to transform. Once that is done too, we can remove the `HashStable` implementation from `HashMap`.

The first commit adds the `StableCompare` trait which is a companion trait to `StableOrd`. Some types like `Symbol` can be compared in a cross-session stable way, but their `Ord` implementation is not stable. In such cases, a `StableCompare` implementation can be provided to offer a lightweight way for stable sorting. The more heavyweight option is to sort via `ToStableHashKey`, but then sorting needs to have access to a stable hashing context and `ToStableHashKey` can also be expensive as in the case of `Symbol` where it has to allocate a `String`.

The rest of the commits are rather mechanical and don't overlap, so they are best reviewed individually.

Part of [MCP 533](https://github.com/rust-lang/compiler-team/issues/533).
This commit is contained in:
bors 2024-01-05 19:38:27 +00:00
commit b8c207435c
30 changed files with 256 additions and 147 deletions
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14
compiler/rustc_codegen_ssa/src/back/symbol_export.rs
View File

@ -3,7 +3,7 @@ use crate::base::allocator_kind_for_codegen;
use std::collections::hash_map::Entry::*;
use rustc_ast::expand::allocator::{ALLOCATOR_METHODS, NO_ALLOC_SHIM_IS_UNSTABLE};
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::unord::UnordMap;
use rustc_hir::def::DefKind;
use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LocalDefId, LOCAL_CRATE};
use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
@ -393,10 +393,10 @@ fn exported_symbols_provider_local(
fn upstream_monomorphizations_provider(
tcx: TyCtxt<'_>,
(): (),
) -> DefIdMap<FxHashMap<GenericArgsRef<'_>, CrateNum>> {
) -> DefIdMap<UnordMap<GenericArgsRef<'_>, CrateNum>> {
let cnums = tcx.crates(());
let mut instances: DefIdMap<FxHashMap<_, _>> = Default::default();
let mut instances: DefIdMap<UnordMap<_, _>> = Default::default();
let drop_in_place_fn_def_id = tcx.lang_items().drop_in_place_fn();
@ -445,7 +445,7 @@ fn upstream_monomorphizations_provider(
fn upstream_monomorphizations_for_provider(
tcx: TyCtxt<'_>,
def_id: DefId,
) -> Option<&FxHashMap<GenericArgsRef<'_>, CrateNum>> {
) -> Option<&UnordMap<GenericArgsRef<'_>, CrateNum>> {
debug_assert!(!def_id.is_local());
tcx.upstream_monomorphizations(()).get(&def_id)
}
@ -656,7 +656,7 @@ fn maybe_emutls_symbol_name<'tcx>(
}
}
fn wasm_import_module_map(tcx: TyCtxt<'_>, cnum: CrateNum) -> FxHashMap<DefId, String> {
fn wasm_import_module_map(tcx: TyCtxt<'_>, cnum: CrateNum) -> DefIdMap<String> {
// Build up a map from DefId to a `NativeLib` structure, where
// `NativeLib` internally contains information about
// `#[link(wasm_import_module = "...")]` for example.
@ -665,9 +665,9 @@ fn wasm_import_module_map(tcx: TyCtxt<'_>, cnum: CrateNum) -> FxHashMap<DefId, S
let def_id_to_native_lib = native_libs
.iter()
.filter_map(|lib| lib.foreign_module.map(|id| (id, lib)))
.collect::<FxHashMap<_, _>>();
.collect::<DefIdMap<_>>();
let mut ret = FxHashMap::default();
let mut ret = DefIdMap::default();
for (def_id, lib) in tcx.foreign_modules(cnum).iter() {
let module = def_id_to_native_lib.get(def_id).and_then(|s| s.wasm_import_module());
let Some(module) = module else { continue };

4
compiler/rustc_codegen_ssa/src/target_features.rs
View File

@ -1,8 +1,8 @@
use crate::errors;
use rustc_ast::ast;
use rustc_attr::InstructionSetAttr;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::fx::FxIndexSet;
use rustc_data_structures::unord::UnordMap;
use rustc_errors::Applicability;
use rustc_hir::def::DefKind;
use rustc_hir::def_id::DefId;
@ -18,7 +18,7 @@ use rustc_span::Span;
pub fn from_target_feature(
tcx: TyCtxt<'_>,
attr: &ast::Attribute,
supported_target_features: &FxHashMap<String, Option<Symbol>>,
supported_target_features: &UnordMap<String, Option<Symbol>>,
target_features: &mut Vec<Symbol>,
) {
let Some(list) = attr.meta_item_list() else { return };

26
compiler/rustc_data_structures/src/stable_hasher.rs
View File

@ -245,6 +245,32 @@ unsafe impl<T: StableOrd> StableOrd for &T {
const CAN_USE_UNSTABLE_SORT: bool = T::CAN_USE_UNSTABLE_SORT;
}
/// This is a companion trait to `StableOrd`. Some types like `Symbol` can be
/// compared in a cross-session stable way, but their `Ord` implementation is
/// not stable. In such cases, a `StableOrd` implementation can be provided
/// to offer a lightweight way for stable sorting. (The more heavyweight option
/// is to sort via `ToStableHashKey`, but then sorting needs to have access to
/// a stable hashing context and `ToStableHashKey` can also be expensive as in
/// the case of `Symbol` where it has to allocate a `String`.)
///
/// See the documentation of [StableOrd] for how stable sort order is defined.
/// The same definition applies here. Be careful when implementing this trait.
pub trait StableCompare {
const CAN_USE_UNSTABLE_SORT: bool;
fn stable_cmp(&self, other: &Self) -> std::cmp::Ordering;
}
/// `StableOrd` denotes that the type's `Ord` implementation is stable, so
/// we can implement `StableCompare` by just delegating to `Ord`.
impl<T: StableOrd> StableCompare for T {
const CAN_USE_UNSTABLE_SORT: bool = T::CAN_USE_UNSTABLE_SORT;
fn stable_cmp(&self, other: &Self) -> std::cmp::Ordering {
self.cmp(other)
}
}
/// Implement HashStable by just calling `Hash::hash()`. Also implement `StableOrd` for the type since
/// that has the same requirements.
///

122
compiler/rustc_data_structures/src/unord.rs
View File

@ -3,9 +3,8 @@
//! as required by the query system.
use rustc_hash::{FxHashMap, FxHashSet};
use smallvec::SmallVec;
use std::{
borrow::Borrow,
borrow::{Borrow, BorrowMut},
collections::hash_map::Entry,
hash::Hash,
iter::{Product, Sum},
@ -14,7 +13,7 @@ use std::{
use crate::{
fingerprint::Fingerprint,
stable_hasher::{HashStable, StableHasher, StableOrd, ToStableHashKey},
stable_hasher::{HashStable, StableCompare, StableHasher, ToStableHashKey},
};
/// `UnordItems` is the order-less version of `Iterator`. It only contains methods
@ -134,36 +133,78 @@ impl<'a, T: Copy + 'a, I: Iterator<Item = &'a T>> UnordItems<&'a T, I> {
}
}
impl<T: Ord, I: Iterator<Item = T>> UnordItems<T, I> {
impl<T, I: Iterator<Item = T>> UnordItems<T, I> {
#[inline]
pub fn into_sorted<HCX>(self, hcx: &HCX) -> Vec<T>
where
T: ToStableHashKey<HCX>,
{
let mut items: Vec<T> = self.0.collect();
items.sort_by_cached_key(|x| x.to_stable_hash_key(hcx));
items
self.collect_sorted(hcx, true)
}
#[inline]
pub fn into_sorted_stable_ord(self) -> Vec<T>
where
T: Ord + StableOrd,
T: StableCompare,
{
let mut items: Vec<T> = self.0.collect();
if !T::CAN_USE_UNSTABLE_SORT {
items.sort();
} else {
items.sort_unstable()
self.collect_stable_ord_by_key(|x| x)
}
#[inline]
pub fn into_sorted_stable_ord_by_key<K, C>(self, project_to_key: C) -> Vec<T>
where
K: StableCompare,
C: for<'a> Fn(&'a T) -> &'a K,
{
self.collect_stable_ord_by_key(project_to_key)
}
#[inline]
pub fn collect_sorted<HCX, C>(self, hcx: &HCX, cache_sort_key: bool) -> C
where
T: ToStableHashKey<HCX>,
C: FromIterator<T> + BorrowMut<[T]>,
{
let mut items: C = self.0.collect();
let slice = items.borrow_mut();
if slice.len() > 1 {
if cache_sort_key {
slice.sort_by_cached_key(|x| x.to_stable_hash_key(hcx));
} else {
slice.sort_by_key(|x| x.to_stable_hash_key(hcx));
}
}
items
}
pub fn into_sorted_small_vec<HCX, const LEN: usize>(self, hcx: &HCX) -> SmallVec<[T; LEN]>
#[inline]
pub fn collect_stable_ord_by_key<K, C, P>(self, project_to_key: P) -> C
where
T: ToStableHashKey<HCX>,
K: StableCompare,
P: for<'a> Fn(&'a T) -> &'a K,
C: FromIterator<T> + BorrowMut<[T]>,
{
let mut items: SmallVec<[T; LEN]> = self.0.collect();
items.sort_by_cached_key(|x| x.to_stable_hash_key(hcx));
let mut items: C = self.0.collect();
let slice = items.borrow_mut();
if slice.len() > 1 {
if !K::CAN_USE_UNSTABLE_SORT {
slice.sort_by(|a, b| {
let a_key = project_to_key(a);
let b_key = project_to_key(b);
a_key.stable_cmp(b_key)
});
} else {
slice.sort_unstable_by(|a, b| {
let a_key = project_to_key(a);
let b_key = project_to_key(b);
a_key.stable_cmp(b_key)
});
}
}
items
}
}
@ -268,16 +309,30 @@ impl<V: Eq + Hash> UnordSet<V> {
}
/// Returns the items of this set in stable sort order (as defined by
/// `StableOrd`). This method is much more efficient than
/// `StableCompare`). This method is much more efficient than
/// `into_sorted` because it does not need to transform keys to their
/// `ToStableHashKey` equivalent.
#[inline]
pub fn to_sorted_stable_ord(&self) -> Vec<V>
pub fn to_sorted_stable_ord(&self) -> Vec<&V>
where
V: Ord + StableOrd + Clone,
V: StableCompare,
{
let mut items: Vec<V> = self.inner.iter().cloned().collect();
items.sort_unstable();
let mut items: Vec<&V> = self.inner.iter().collect();
items.sort_unstable_by(|a, b| a.stable_cmp(*b));
items
}
/// Returns the items of this set in stable sort order (as defined by
/// `StableCompare`). This method is much more efficient than
/// `into_sorted` because it does not need to transform keys to their
/// `ToStableHashKey` equivalent.
#[inline]
pub fn into_sorted_stable_ord(self) -> Vec<V>
where
V: StableCompare,
{
let mut items: Vec<V> = self.inner.into_iter().collect();
items.sort_unstable_by(V::stable_cmp);
items
}
@ -483,16 +538,16 @@ impl<K: Eq + Hash, V> UnordMap<K, V> {
to_sorted_vec(hcx, self.inner.iter(), cache_sort_key, |&(k, _)| k)
}
/// Returns the entries of this map in stable sort order (as defined by `StableOrd`).
/// Returns the entries of this map in stable sort order (as defined by `StableCompare`).
/// This method can be much more efficient than `into_sorted` because it does not need
/// to transform keys to their `ToStableHashKey` equivalent.
#[inline]
pub fn to_sorted_stable_ord(&self) -> Vec<(K, &V)>
pub fn to_sorted_stable_ord(&self) -> Vec<(&K, &V)>
where
K: Ord + StableOrd + Copy,
K: StableCompare,
{
let mut items: Vec<(K, &V)> = self.inner.iter().map(|(&k, v)| (k, v)).collect();
items.sort_unstable_by_key(|&(k, _)| k);
let mut items: Vec<_> = self.inner.iter().collect();
items.sort_unstable_by(|(a, _), (b, _)| a.stable_cmp(*b));
items
}
@ -510,6 +565,19 @@ impl<K: Eq + Hash, V> UnordMap<K, V> {
to_sorted_vec(hcx, self.inner.into_iter(), cache_sort_key, |(k, _)| k)
}
/// Returns the entries of this map in stable sort order (as defined by `StableCompare`).
/// This method can be much more efficient than `into_sorted` because it does not need
/// to transform keys to their `ToStableHashKey` equivalent.
#[inline]
pub fn into_sorted_stable_ord(self) -> Vec<(K, V)>
where
K: StableCompare,
{
let mut items: Vec<(K, V)> = self.inner.into_iter().collect();
items.sort_unstable_by(|a, b| a.0.stable_cmp(&b.0));
items
}
/// Returns the values of this map in stable sort order (as defined by K's
/// `ToStableHashKey` implementation).
///

5
compiler/rustc_hir_analysis/src/astconv/errors.rs
View File

@ -6,6 +6,7 @@ use crate::errors::{
use crate::fluent_generated as fluent;
use crate::traits::error_reporting::report_object_safety_error;
use rustc_data_structures::fx::{FxHashMap, FxIndexMap, FxIndexSet};
use rustc_data_structures::unord::UnordMap;
use rustc_errors::{pluralize, struct_span_err, Applicability, Diagnostic, ErrorGuaranteed};
use rustc_hir as hir;
use rustc_hir::def_id::{DefId, LocalDefId};
@ -673,7 +674,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
}))
})
.flatten()
.collect::<FxHashMap<Symbol, &ty::AssocItem>>();
.collect::<UnordMap<Symbol, &ty::AssocItem>>();
let mut names = names
.into_iter()
@ -709,7 +710,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
let mut where_constraints = vec![];
let mut already_has_generics_args_suggestion = false;
for (span, assoc_items) in &associated_types {
let mut names: FxHashMap<_, usize> = FxHashMap::default();
let mut names: UnordMap<_, usize> = Default::default();
for item in assoc_items {
types_count += 1;
*names.entry(item.name).or_insert(0) += 1;

6
compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
View File

@ -1,6 +1,6 @@
use super::potentially_plural_count;
use crate::errors::LifetimesOrBoundsMismatchOnTrait;
use hir::def_id::{DefId, LocalDefId};
use hir::def_id::{DefId, DefIdMap, LocalDefId};
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexSet};
use rustc_errors::{pluralize, struct_span_err, Applicability, DiagnosticId, ErrorGuaranteed};
use rustc_hir as hir;
@ -478,7 +478,7 @@ fn compare_asyncness<'tcx>(
pub(super) fn collect_return_position_impl_trait_in_trait_tys<'tcx>(
tcx: TyCtxt<'tcx>,
impl_m_def_id: LocalDefId,
) -> Result<&'tcx FxHashMap<DefId, ty::EarlyBinder<Ty<'tcx>>>, ErrorGuaranteed> {
) -> Result<&'tcx DefIdMap<ty::EarlyBinder<Ty<'tcx>>>, ErrorGuaranteed> {
let impl_m = tcx.opt_associated_item(impl_m_def_id.to_def_id()).unwrap();
let trait_m = tcx.opt_associated_item(impl_m.trait_item_def_id.unwrap()).unwrap();
let impl_trait_ref =
@ -706,7 +706,7 @@ pub(super) fn collect_return_position_impl_trait_in_trait_tys<'tcx>(
);
ocx.resolve_regions_and_report_errors(impl_m_def_id, &outlives_env)?;
let mut remapped_types = FxHashMap::default();
let mut remapped_types = DefIdMap::default();
for (def_id, (ty, args)) in collected_types {
match infcx.fully_resolve((ty, args)) {
Ok((ty, args)) => {

3
compiler/rustc_hir_analysis/src/collect.rs
View File

@ -16,6 +16,7 @@
use rustc_data_structures::captures::Captures;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_data_structures::unord::UnordMap;
use rustc_errors::{Applicability, DiagnosticBuilder, ErrorGuaranteed, StashKey};
use rustc_hir as hir;
use rustc_hir::def::DefKind;
@ -979,7 +980,7 @@ fn trait_def(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::TraitDef {
})
// Check for duplicates
.and_then(|list| {
let mut set: FxHashMap<Symbol, Span> = FxHashMap::default();
let mut set: UnordMap<Symbol, Span> = Default::default();
let mut no_dups = true;
for ident in &*list {

2
compiler/rustc_hir_typeck/src/method/suggest.rs
View File

@ -913,7 +913,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
for ((span, add_where_or_comma), obligations) in type_params.into_iter() {
restrict_type_params = true;
// #74886: Sort here so that the output is always the same.
let obligations = obligations.to_sorted_stable_ord();
let obligations = obligations.into_sorted_stable_ord();
err.span_suggestion_verbose(
span,
format!(

2
compiler/rustc_hir_typeck/src/upvar.rs
View File

@ -912,7 +912,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
drop_order: bool,
) -> MigrationWarningReason {
MigrationWarningReason {
auto_traits: auto_trait_reasons.to_sorted_stable_ord(),
auto_traits: auto_trait_reasons.into_sorted_stable_ord(),
drop_order,
}
}

2
compiler/rustc_hir_typeck/src/writeback.rs
View File

@ -473,7 +473,7 @@ impl<'cx, 'tcx> WritebackCx<'cx, 'tcx> {
assert_eq!(fcx_typeck_results.hir_owner, self.typeck_results.hir_owner);
let fcx_coercion_casts = fcx_typeck_results.coercion_casts().to_sorted_stable_ord();
for local_id in fcx_coercion_casts {
for &local_id in fcx_coercion_casts {
self.typeck_results.set_coercion_cast(local_id);
}
}

2
compiler/rustc_incremental/src/persist/save.rs
View File

@ -103,7 +103,7 @@ pub fn save_work_product_index(
// deleted during invalidation. Some object files don't change their
// content, they are just not needed anymore.
let previous_work_products = dep_graph.previous_work_products();
for (id, wp) in previous_work_products.to_sorted_stable_ord().iter() {
for (id, wp) in previous_work_products.to_sorted_stable_ord() {
if !new_work_products.contains_key(id) {
work_product::delete_workproduct_files(sess, wp);
debug_assert!(

10
compiler/rustc_lint/src/foreign_modules.rs
View File

@ -1,5 +1,5 @@
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_data_structures::stack::ensure_sufficient_stack;
use rustc_data_structures::unord::{UnordMap, UnordSet};
use rustc_hir as hir;
use rustc_hir::def::DefKind;
use rustc_middle::query::Providers;
@ -72,7 +72,7 @@ struct ClashingExternDeclarations {
/// the symbol should be reported as a clashing declaration.
// FIXME: Technically, we could just store a &'tcx str here without issue; however, the
// `impl_lint_pass` macro doesn't currently support lints parametric over a lifetime.
seen_decls: FxHashMap<Symbol, hir::OwnerId>,
seen_decls: UnordMap<Symbol, hir::OwnerId>,
}
/// Differentiate between whether the name for an extern decl came from the link_name attribute or
@ -96,7 +96,7 @@ impl SymbolName {
impl ClashingExternDeclarations {
pub(crate) fn new() -> Self {
ClashingExternDeclarations { seen_decls: FxHashMap::default() }
ClashingExternDeclarations { seen_decls: Default::default() }
}
/// Insert a new foreign item into the seen set. If a symbol with the same name already exists
@ -209,12 +209,12 @@ fn structurally_same_type<'tcx>(
b: Ty<'tcx>,
ckind: types::CItemKind,
) -> bool {
let mut seen_types = FxHashSet::default();
let mut seen_types = UnordSet::default();
structurally_same_type_impl(&mut seen_types, tcx, param_env, a, b, ckind)
}
fn structurally_same_type_impl<'tcx>(
seen_types: &mut FxHashSet<(Ty<'tcx>, Ty<'tcx>)>,
seen_types: &mut UnordSet<(Ty<'tcx>, Ty<'tcx>)>,
tcx: TyCtxt<'tcx>,
param_env: ty::ParamEnv<'tcx>,
a: Ty<'tcx>,

11
compiler/rustc_lint/src/non_ascii_idents.rs
View File

@ -4,7 +4,8 @@ use crate::lints::{
};
use crate::{EarlyContext, EarlyLintPass, LintContext};
use rustc_ast as ast;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::fx::FxIndexMap;
use rustc_data_structures::unord::UnordMap;
use rustc_span::symbol::Symbol;
declare_lint! {
@ -194,8 +195,8 @@ impl EarlyLintPass for NonAsciiIdents {
}
if has_non_ascii_idents && check_confusable_idents {
let mut skeleton_map: FxHashMap<Symbol, (Symbol, Span, bool)> =
FxHashMap::with_capacity_and_hasher(symbols.len(), Default::default());
let mut skeleton_map: UnordMap<Symbol, (Symbol, Span, bool)> =
UnordMap::with_capacity(symbols.len());
let mut skeleton_buf = String::new();
for (&symbol, &sp) in symbols.iter() {
@ -248,8 +249,8 @@ impl EarlyLintPass for NonAsciiIdents {
Verified,
}
let mut script_states: FxHashMap<AugmentedScriptSet, ScriptSetUsage> =
FxHashMap::default();
let mut script_states: FxIndexMap<AugmentedScriptSet, ScriptSetUsage> =
Default::default();
let latin_augmented_script_set = AugmentedScriptSet::for_char('A');
script_states.insert(latin_augmented_script_set, ScriptSetUsage::Verified);

12
compiler/rustc_lint_defs/src/lib.rs
View File

@ -9,7 +9,9 @@ pub use self::Level::*;
use rustc_ast::node_id::NodeId;
use rustc_ast::{AttrId, Attribute};
use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
use rustc_data_structures::stable_hasher::{
HashStable, StableCompare, StableHasher, ToStableHashKey,
};
use rustc_error_messages::{DiagnosticMessage, MultiSpan};
use rustc_hir::HashStableContext;
use rustc_hir::HirId;
@ -541,6 +543,14 @@ impl<HCX> ToStableHashKey<HCX> for LintId {
}
}
impl StableCompare for LintId {
const CAN_USE_UNSTABLE_SORT: bool = true;
fn stable_cmp(&self, other: &Self) -> std::cmp::Ordering {
self.lint_name_raw().cmp(&other.lint_name_raw())
}
}
#[derive(Debug)]
pub struct AmbiguityErrorDiag {
pub msg: String,

17
compiler/rustc_metadata/src/rmeta/encoder.rs
View File

@ -2,10 +2,8 @@ use crate::errors::{FailCreateFileEncoder, FailWriteFile};
use crate::rmeta::*;
use rustc_ast::Attribute;
use rustc_data_structures::fingerprint::Fingerprint;
use rustc_data_structures::fx::FxIndexSet;
use rustc_data_structures::memmap::{Mmap, MmapMut};
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_data_structures::sync::{join, par_for_each_in, Lrc};
use rustc_data_structures::temp_dir::MaybeTempDir;
use rustc_hir as hir;
@ -1914,14 +1912,15 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
empty_proc_macro!(self);
let tcx = self.tcx;
let lib_features = tcx.lib_features(LOCAL_CRATE);
self.lazy_array(lib_features.to_vec())
self.lazy_array(lib_features.to_sorted_vec())
}
fn encode_stability_implications(&mut self) -> LazyArray<(Symbol, Symbol)> {
empty_proc_macro!(self);
let tcx = self.tcx;
let implications = tcx.stability_implications(LOCAL_CRATE);
self.lazy_array(implications.iter().map(|(k, v)| (*k, *v)))
let sorted = implications.to_sorted_stable_ord();
self.lazy_array(sorted.into_iter().map(|(k, v)| (*k, *v)))
}
fn encode_diagnostic_items(&mut self) -> LazyArray<(Symbol, DefIndex)> {
@ -2033,14 +2032,10 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
fn encode_incoherent_impls(&mut self) -> LazyArray<IncoherentImpls> {
empty_proc_macro!(self);
let tcx = self.tcx;
let mut all_impls: Vec<_> = tcx.crate_inherent_impls(()).incoherent_impls.iter().collect();
tcx.with_stable_hashing_context(|mut ctx| {
all_impls.sort_by_cached_key(|&(&simp, _)| {
let mut hasher = StableHasher::new();
simp.hash_stable(&mut ctx, &mut hasher);
hasher.finish::<Fingerprint>()
})
let all_impls = tcx.with_stable_hashing_context(|hcx| {
tcx.crate_inherent_impls(()).incoherent_impls.to_sorted(&hcx, true)
});
let all_impls: Vec<_> = all_impls
.into_iter()
.map(|(&simp, impls)| {

4
compiler/rustc_metadata/src/rmeta/mod.rs
View File

@ -12,7 +12,7 @@ use rustc_attr as attr;
use rustc_data_structures::svh::Svh;
use rustc_hir as hir;
use rustc_hir::def::{CtorKind, DefKind, DocLinkResMap};
use rustc_hir::def_id::{CrateNum, DefId, DefIndex, DefPathHash, StableCrateId};
use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, DefIndex, DefPathHash, StableCrateId};
use rustc_hir::definitions::DefKey;
use rustc_hir::lang_items::LangItem;
use rustc_index::bit_set::BitSet;
@ -459,7 +459,7 @@ define_tables! {
macro_definition: Table<DefIndex, LazyValue<ast::DelimArgs>>,
proc_macro: Table<DefIndex, MacroKind>,
deduced_param_attrs: Table<DefIndex, LazyArray<DeducedParamAttrs>>,
trait_impl_trait_tys: Table<DefIndex, LazyValue<FxHashMap<DefId, ty::EarlyBinder<Ty<'static>>>>>,
trait_impl_trait_tys: Table<DefIndex, LazyValue<DefIdMap<ty::EarlyBinder<Ty<'static>>>>>,
doc_link_resolutions: Table<DefIndex, LazyValue<DocLinkResMap>>,
doc_link_traits_in_scope: Table<DefIndex, LazyArray<DefId>>,
assumed_wf_types_for_rpitit: Table<DefIndex, LazyArray<(Ty<'static>, Span)>>,

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

@ -103,7 +103,7 @@ macro_rules! arena_types {
[] dep_kind: rustc_middle::dep_graph::DepKindStruct<'tcx>,
[decode] trait_impl_trait_tys:
rustc_data_structures::fx::FxHashMap<
rustc_data_structures::unord::UnordMap<
rustc_hir::def_id::DefId,
rustc_middle::ty::EarlyBinder<rustc_middle::ty::Ty<'tcx>>
>,

15
compiler/rustc_middle/src/middle/mod.rs
View File

@ -4,7 +4,7 @@ pub mod dependency_format;
pub mod exported_symbols;
pub mod lang_items;
pub mod lib_features {
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::unord::UnordMap;
use rustc_span::{symbol::Symbol, Span};
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
@ -16,15 +16,16 @@ pub mod lib_features {
#[derive(HashStable, Debug, Default)]
pub struct LibFeatures {
pub stability: FxHashMap<Symbol, (FeatureStability, Span)>,
pub stability: UnordMap<Symbol, (FeatureStability, Span)>,
}
impl LibFeatures {
pub fn to_vec(&self) -> Vec<(Symbol, FeatureStability)> {
let mut all_features: Vec<_> =
self.stability.iter().map(|(&sym, &(stab, _))| (sym, stab)).collect();
all_features.sort_unstable_by(|(a, _), (b, _)| a.as_str().cmp(b.as_str()));
all_features
pub fn to_sorted_vec(&self) -> Vec<(Symbol, FeatureStability)> {
self.stability
.to_sorted_stable_ord()
.iter()
.map(|(&sym, &(stab, _))| (sym, stab))
.collect()
}
}
}

29
compiler/rustc_middle/src/middle/region.rs
View File

@ -7,12 +7,11 @@
//! [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/borrow_check.html
use crate::ty::TyCtxt;
use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_data_structures::fx::FxIndexMap;
use rustc_data_structures::unord::UnordMap;
use rustc_hir as hir;
use rustc_hir::{HirIdMap, Node};
use rustc_macros::HashStable;
use rustc_query_system::ich::StableHashingContext;
use rustc_span::{Span, DUMMY_SP};
use std::fmt;
@ -205,7 +204,7 @@ impl Scope {
pub type ScopeDepth = u32;
/// The region scope tree encodes information about region relationships.
#[derive(Default, Debug)]
#[derive(Default, Debug, HashStable)]
pub struct ScopeTree {
/// If not empty, this body is the root of this region hierarchy.
pub root_body: Option<hir::HirId>,
@ -306,7 +305,7 @@ pub struct ScopeTree {
/// The reason is that semantically, until the `box` expression returns,
/// the values are still owned by their containing expressions. So
/// we'll see that `&x`.
pub yield_in_scope: FxHashMap<Scope, Vec<YieldData>>,
pub yield_in_scope: UnordMap<Scope, Vec<YieldData>>,
}
/// Identifies the reason that a given expression is an rvalue candidate
@ -404,23 +403,3 @@ impl ScopeTree {
self.yield_in_scope.get(&scope).map(Deref::deref)
}
}
impl<'a> HashStable<StableHashingContext<'a>> for ScopeTree {
fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
let ScopeTree {
root_body,
ref parent_map,
ref var_map,
ref destruction_scopes,
ref rvalue_candidates,
ref yield_in_scope,
} = *self;
root_body.hash_stable(hcx, hasher);
parent_map.hash_stable(hcx, hasher);
var_map.hash_stable(hcx, hasher);
destruction_scopes.hash_stable(hcx, hasher);
rvalue_candidates.hash_stable(hcx, hasher);
yield_in_scope.hash_stable(hcx, hasher);
}
}

6
compiler/rustc_middle/src/middle/resolve_bound_vars.rs
View File

@ -2,7 +2,7 @@
use crate::ty;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::fx::FxIndexMap;
use rustc_errors::ErrorGuaranteed;
use rustc_hir::def_id::DefId;
use rustc_hir::{ItemLocalId, OwnerId};
@ -51,7 +51,7 @@ pub enum ObjectLifetimeDefault {
pub struct ResolveBoundVars {
/// Maps from every use of a named (not anonymous) lifetime to a
/// `Region` describing how that region is bound
pub defs: FxHashMap<OwnerId, FxHashMap<ItemLocalId, ResolvedArg>>,
pub defs: FxIndexMap<OwnerId, FxIndexMap<ItemLocalId, ResolvedArg>>,
pub late_bound_vars: FxHashMap<OwnerId, FxHashMap<ItemLocalId, Vec<ty::BoundVariableKind>>>,
pub late_bound_vars: FxIndexMap<OwnerId, FxIndexMap<ItemLocalId, Vec<ty::BoundVariableKind>>>,
}

14
compiler/rustc_middle/src/middle/stability.rs
View File

@ -8,11 +8,11 @@ use rustc_ast::NodeId;
use rustc_attr::{
self as attr, ConstStability, DefaultBodyStability, DeprecatedSince, Deprecation, Stability,
};
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::unord::UnordMap;
use rustc_errors::{Applicability, Diagnostic};
use rustc_feature::GateIssue;
use rustc_hir::def::DefKind;
use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_hir::def_id::{DefId, LocalDefId, LocalDefIdMap};
use rustc_hir::{self as hir, HirId};
use rustc_middle::ty::print::with_no_trimmed_paths;
use rustc_session::lint::builtin::{DEPRECATED, DEPRECATED_IN_FUTURE, SOFT_UNSTABLE};
@ -61,10 +61,10 @@ impl DeprecationEntry {
pub struct Index {
/// This is mostly a cache, except the stabilities of local items
/// are filled by the annotator.
pub stab_map: FxHashMap<LocalDefId, Stability>,
pub const_stab_map: FxHashMap<LocalDefId, ConstStability>,
pub default_body_stab_map: FxHashMap<LocalDefId, DefaultBodyStability>,
pub depr_map: FxHashMap<LocalDefId, DeprecationEntry>,
pub stab_map: LocalDefIdMap<Stability>,
pub const_stab_map: LocalDefIdMap<ConstStability>,
pub default_body_stab_map: LocalDefIdMap<DefaultBodyStability>,
pub depr_map: LocalDefIdMap<DeprecationEntry>,
/// Mapping from feature name to feature name based on the `implied_by` field of `#[unstable]`
/// attributes. If a `#[unstable(feature = "implier", implied_by = "impliee")]` attribute
/// exists, then this map will have a `impliee -> implier` entry.
@ -77,7 +77,7 @@ pub struct Index {
/// to know that the feature implies another feature. If it were reversed, and the `#[stable]`
/// attribute had an `implies` meta item, then a map would be necessary when avoiding a "use of
/// unstable feature" error for a feature that was implied.
pub implications: FxHashMap<Symbol, Symbol>,
pub implications: UnordMap<Symbol, Symbol>,
}
impl Index {

22
compiler/rustc_middle/src/query/mod.rs
View File

@ -57,11 +57,11 @@ use rustc_ast as ast;
use rustc_ast::expand::{allocator::AllocatorKind, StrippedCfgItem};
use rustc_attr as attr;
use rustc_data_structures::fingerprint::Fingerprint;
use rustc_data_structures::fx::{FxHashMap, FxIndexMap, FxIndexSet};
use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
use rustc_data_structures::steal::Steal;
use rustc_data_structures::svh::Svh;
use rustc_data_structures::sync::Lrc;
use rustc_data_structures::unord::UnordSet;
use rustc_data_structures::unord::{UnordMap, UnordSet};
use rustc_errors::ErrorGuaranteed;
use rustc_hir as hir;
use rustc_hir::def::{DefKind, DocLinkResMap};
@ -264,7 +264,7 @@ rustc_queries! {
}
query collect_return_position_impl_trait_in_trait_tys(key: DefId)
-> Result<&'tcx FxHashMap<DefId, ty::EarlyBinder<Ty<'tcx>>>, ErrorGuaranteed>
-> Result<&'tcx DefIdMap<ty::EarlyBinder<Ty<'tcx>>>, ErrorGuaranteed>
{
desc { "comparing an impl and trait method signature, inferring any hidden `impl Trait` types in the process" }
cache_on_disk_if { key.is_local() }
@ -611,7 +611,7 @@ rustc_queries! {
desc { "erasing regions from `{}`", ty }
}
query wasm_import_module_map(_: CrateNum) -> &'tcx FxHashMap<DefId, String> {
query wasm_import_module_map(_: CrateNum) -> &'tcx DefIdMap<String> {
arena_cache
desc { "getting wasm import module map" }
}
@ -1537,7 +1537,7 @@ rustc_queries! {
/// added or removed in any upstream crate. Instead use the narrower
/// `upstream_monomorphizations_for`, `upstream_drop_glue_for`, or, even
/// better, `Instance::upstream_monomorphization()`.
query upstream_monomorphizations(_: ()) -> &'tcx DefIdMap<FxHashMap<GenericArgsRef<'tcx>, CrateNum>> {
query upstream_monomorphizations(_: ()) -> &'tcx DefIdMap<UnordMap<GenericArgsRef<'tcx>, CrateNum>> {
arena_cache
desc { "collecting available upstream monomorphizations" }
}
@ -1550,7 +1550,7 @@ rustc_queries! {
/// You likely want to call `Instance::upstream_monomorphization()`
/// instead of invoking this query directly.
query upstream_monomorphizations_for(def_id: DefId)
-> Option<&'tcx FxHashMap<GenericArgsRef<'tcx>, CrateNum>>
-> Option<&'tcx UnordMap<GenericArgsRef<'tcx>, CrateNum>>
{
desc { |tcx|
"collecting available upstream monomorphizations for `{}`",
@ -1662,7 +1662,7 @@ rustc_queries! {
desc { "resolving lifetimes" }
}
query named_variable_map(_: hir::OwnerId) ->
Option<&'tcx FxHashMap<ItemLocalId, ResolvedArg>> {
Option<&'tcx FxIndexMap<ItemLocalId, ResolvedArg>> {
desc { "looking up a named region" }
}
query is_late_bound_map(_: hir::OwnerId) -> Option<&'tcx FxIndexSet<ItemLocalId>> {
@ -1678,7 +1678,7 @@ rustc_queries! {
separate_provide_extern
}
query late_bound_vars_map(_: hir::OwnerId)
-> Option<&'tcx FxHashMap<ItemLocalId, Vec<ty::BoundVariableKind>>> {
-> Option<&'tcx FxIndexMap<ItemLocalId, Vec<ty::BoundVariableKind>>> {
desc { "looking up late bound vars" }
}
@ -1734,7 +1734,7 @@ rustc_queries! {
separate_provide_extern
arena_cache
}
query stability_implications(_: CrateNum) -> &'tcx FxHashMap<Symbol, Symbol> {
query stability_implications(_: CrateNum) -> &'tcx UnordMap<Symbol, Symbol> {
arena_cache
desc { "calculating the implications between `#[unstable]` features defined in a crate" }
separate_provide_extern
@ -1786,7 +1786,7 @@ rustc_queries! {
}
/// Collects the "trimmed", shortest accessible paths to all items for diagnostics.
/// See the [provider docs](`rustc_middle::ty::print::trimmed_def_paths`) for more info.
query trimmed_def_paths(_: ()) -> &'tcx FxHashMap<DefId, Symbol> {
query trimmed_def_paths(_: ()) -> &'tcx DefIdMap<Symbol> {
arena_cache
desc { "calculating trimmed def paths" }
}
@ -2077,7 +2077,7 @@ rustc_queries! {
desc { "computing autoderef types for `{}`", goal.value.value }
}
query supported_target_features(_: CrateNum) -> &'tcx FxHashMap<String, Option<Symbol>> {
query supported_target_features(_: CrateNum) -> &'tcx UnordMap<String, Option<Symbol>> {
arena_cache
eval_always
desc { "looking up supported target features" }

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

@ -2,7 +2,7 @@ use rustc_data_structures::fx::{FxHashMap, FxIndexSet};
use rustc_data_structures::memmap::Mmap;
use rustc_data_structures::sync::{HashMapExt, Lock, Lrc, RwLock};
use rustc_data_structures::unhash::UnhashMap;
use rustc_data_structures::unord::UnordSet;
use rustc_data_structures::unord::{UnordMap, UnordSet};
use rustc_hir::def_id::{CrateNum, DefId, DefIndex, LocalDefId, StableCrateId, LOCAL_CRATE};
use rustc_hir::definitions::DefPathHash;
use rustc_index::{Idx, IndexVec};
@ -764,7 +764,7 @@ impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>> for &'tcx UnordSet<LocalDefId>
}
impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>>
for &'tcx FxHashMap<DefId, ty::EarlyBinder<Ty<'tcx>>>
for &'tcx UnordMap<DefId, ty::EarlyBinder<Ty<'tcx>>>
{
#[inline]
fn decode(d: &mut CacheDecoder<'a, 'tcx>) -> Self {

5
compiler/rustc_middle/src/ty/mod.rs
View File

@ -38,6 +38,7 @@ use rustc_data_structures::intern::Interned;
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_data_structures::steal::Steal;
use rustc_data_structures::tagged_ptr::CopyTaggedPtr;
use rustc_data_structures::unord::UnordMap;
use rustc_errors::{DiagnosticBuilder, ErrorGuaranteed, StashKey};
use rustc_hir as hir;
use rustc_hir::def::{CtorKind, CtorOf, DefKind, DocLinkResMap, LifetimeRes, Res};
@ -655,7 +656,7 @@ pub struct CratePredicatesMap<'tcx> {
/// For each struct with outlive bounds, maps to a vector of the
/// predicate of its outlive bounds. If an item has no outlives
/// bounds, it will have no entry.
pub predicates: FxHashMap<DefId, &'tcx [(Clause<'tcx>, Span)]>,
pub predicates: DefIdMap<&'tcx [(Clause<'tcx>, Span)]>,
}
impl<'tcx> Clause<'tcx> {
@ -2658,7 +2659,7 @@ pub fn provide(providers: &mut Providers) {
#[derive(Clone, Debug, Default, HashStable)]
pub struct CrateInherentImpls {
pub inherent_impls: LocalDefIdMap<Vec<DefId>>,
pub incoherent_impls: FxHashMap<SimplifiedType, Vec<LocalDefId>>,
pub incoherent_impls: UnordMap<SimplifiedType, Vec<LocalDefId>>,
}
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, TyEncodable, HashStable)]

7
compiler/rustc_middle/src/ty/parameterized.rs
View File

@ -1,6 +1,7 @@
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::unord::UnordMap;
use rustc_hir::def_id::DefIndex;
use rustc_index::{Idx, IndexVec};
use std::hash::Hash;
use crate::ty;
@ -24,8 +25,8 @@ impl<I: Idx + 'static, T: ParameterizedOverTcx> ParameterizedOverTcx for IndexVe
type Value<'tcx> = IndexVec<I, T::Value<'tcx>>;
}
impl<I: 'static, T: ParameterizedOverTcx> ParameterizedOverTcx for FxHashMap<I, T> {
type Value<'tcx> = FxHashMap<I, T::Value<'tcx>>;
impl<I: Hash + Eq + 'static, T: ParameterizedOverTcx> ParameterizedOverTcx for UnordMap<I, T> {
type Value<'tcx> = UnordMap<I, T::Value<'tcx>>;
}
impl<T: ParameterizedOverTcx> ParameterizedOverTcx for ty::Binder<'static, T> {

6
compiler/rustc_middle/src/ty/print/pretty.rs
View File

@ -12,7 +12,7 @@ use rustc_apfloat::Float;
use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
use rustc_hir as hir;
use rustc_hir::def::{self, CtorKind, DefKind, Namespace};
use rustc_hir::def_id::{DefIdSet, ModDefId, CRATE_DEF_ID, LOCAL_CRATE};
use rustc_hir::def_id::{DefIdMap, DefIdSet, ModDefId, CRATE_DEF_ID, LOCAL_CRATE};
use rustc_hir::definitions::{DefKey, DefPathDataName};
use rustc_hir::LangItem;
use rustc_session::config::TrimmedDefPaths;
@ -3049,8 +3049,8 @@ fn for_each_def(tcx: TyCtxt<'_>, mut collect_fn: impl for<'b> FnMut(&'b Ident, N
///
/// See also [`DelayDm`](rustc_error_messages::DelayDm) and [`with_no_trimmed_paths!`].
// this is pub to be able to intra-doc-link it
pub fn trimmed_def_paths(tcx: TyCtxt<'_>, (): ()) -> FxHashMap<DefId, Symbol> {
let mut map: FxHashMap<DefId, Symbol> = FxHashMap::default();
pub fn trimmed_def_paths(tcx: TyCtxt<'_>, (): ()) -> DefIdMap<Symbol> {
let mut map: DefIdMap<Symbol> = Default::default();
if let TrimmedDefPaths::GoodPath = tcx.sess.opts.trimmed_def_paths {
// Trimming paths is expensive and not optimized, since we expect it to only be used for error reporting.

2
compiler/rustc_middle/src/ty/typeck_results.rs
View File

@ -527,7 +527,7 @@ impl<'a, V> LocalTableInContext<'a, V> {
}
pub fn items_in_stable_order(&self) -> Vec<(ItemLocalId, &'a V)> {
self.data.to_sorted_stable_ord()
self.data.items().map(|(&k, v)| (k, v)).into_sorted_stable_ord_by_key(|(k, _)| k)
}
}

19
compiler/rustc_passes/src/stability.rs
View File

@ -6,7 +6,8 @@ use rustc_attr::{
self as attr, ConstStability, DeprecatedSince, Stability, StabilityLevel, StableSince,
Unstable, UnstableReason, VERSION_PLACEHOLDER,
};
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap};
use rustc_data_structures::fx::FxIndexMap;
use rustc_data_structures::unord::{ExtendUnord, UnordMap, UnordSet};
use rustc_hir as hir;
use rustc_hir::def::{DefKind, Res};
use rustc_hir::def_id::{LocalDefId, LocalModDefId, CRATE_DEF_ID, LOCAL_CRATE};
@ -923,7 +924,7 @@ pub fn check_unused_or_stable_features(tcx: TyCtxt<'_>) {
}
let declared_lang_features = &tcx.features().declared_lang_features;
let mut lang_features = FxHashSet::default();
let mut lang_features = UnordSet::default();
for &(feature, span, since) in declared_lang_features {
if let Some(since) = since {
// Warn if the user has enabled an already-stable lang feature.
@ -980,11 +981,11 @@ pub fn check_unused_or_stable_features(tcx: TyCtxt<'_>) {
fn check_features<'tcx>(
tcx: TyCtxt<'tcx>,
remaining_lib_features: &mut FxIndexMap<&Symbol, Span>,
remaining_implications: &mut FxHashMap<Symbol, Symbol>,
remaining_implications: &mut UnordMap<Symbol, Symbol>,
defined_features: &LibFeatures,
all_implications: &FxHashMap<Symbol, Symbol>,
all_implications: &UnordMap<Symbol, Symbol>,
) {
for (feature, since) in defined_features.to_vec() {
for (feature, since) in defined_features.to_sorted_vec() {
if let FeatureStability::AcceptedSince(since) = since
&& let Some(span) = remaining_lib_features.get(&feature)
{
@ -1021,7 +1022,8 @@ pub fn check_unused_or_stable_features(tcx: TyCtxt<'_>) {
// `remaining_lib_features`.
let mut all_implications = remaining_implications.clone();
for &cnum in tcx.crates(()) {
all_implications.extend(tcx.stability_implications(cnum));
all_implications
.extend_unord(tcx.stability_implications(cnum).items().map(|(k, v)| (*k, *v)));
}
check_features(
@ -1050,10 +1052,7 @@ pub fn check_unused_or_stable_features(tcx: TyCtxt<'_>) {
tcx.dcx().emit_err(errors::UnknownFeature { span, feature: *feature });
}
// We only use the hash map contents to emit errors, and the order of
// emitted errors do not affect query stability.
#[allow(rustc::potential_query_instability)]
for (implied_by, feature) in remaining_implications {
for (&implied_by, &feature) in remaining_implications.to_sorted_stable_ord() {
let local_defined_features = tcx.lib_features(LOCAL_CRATE);
let span = local_defined_features
.stability

18
compiler/rustc_span/src/def_id.rs
View File

@ -1,6 +1,8 @@
use crate::{HashStableContext, Symbol};
use rustc_data_structures::fingerprint::Fingerprint;
use rustc_data_structures::stable_hasher::{Hash64, HashStable, StableHasher, ToStableHashKey};
use rustc_data_structures::stable_hasher::{
Hash64, HashStable, StableHasher, StableOrd, ToStableHashKey,
};
use rustc_data_structures::unhash::Unhasher;
use rustc_data_structures::AtomicRef;
use rustc_index::Idx;
@ -132,6 +134,11 @@ impl Default for DefPathHash {
}
}
// Safety: `DefPathHash` sort order is not affected (de)serialization.
unsafe impl StableOrd for DefPathHash {
const CAN_USE_UNSTABLE_SORT: bool = true;
}
/// A [`StableCrateId`] is a 64-bit hash of a crate name, together with all
/// `-Cmetadata` arguments, and some other data. It is to [`CrateNum`] what [`DefPathHash`] is to
/// [`DefId`]. It is stable across compilation sessions.
@ -490,6 +497,15 @@ impl<CTX: HashStableContext> ToStableHashKey<CTX> for CrateNum {
}
}
impl<CTX: HashStableContext> ToStableHashKey<CTX> for DefPathHash {
type KeyType = DefPathHash;
#[inline]
fn to_stable_hash_key(&self, _: &CTX) -> DefPathHash {
*self
}
}
macro_rules! typed_def_id {
($Name:ident, $LocalName:ident) => {
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Encodable, Decodable, HashStable_Generic)]

12
compiler/rustc_span/src/symbol.rs
View File

@ -4,7 +4,9 @@
use rustc_arena::DroplessArena;
use rustc_data_structures::fx::FxIndexSet;
use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
use rustc_data_structures::stable_hasher::{
HashStable, StableCompare, StableHasher, ToStableHashKey,
};
use rustc_data_structures::sync::Lock;
use rustc_macros::HashStable_Generic;
use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
@ -2104,6 +2106,14 @@ impl<CTX> ToStableHashKey<CTX> for Symbol {
}
}
impl StableCompare for Symbol {
const CAN_USE_UNSTABLE_SORT: bool = true;
fn stable_cmp(&self, other: &Self) -> std::cmp::Ordering {
self.as_str().cmp(other.as_str())
}
}
pub(crate) struct Interner(Lock<InternerInner>);
// The `&'static str`s in this type actually point into the arena.