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Introduce StructFlags

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This commit is contained in:
Lukas Wirth 2023-03-30 09:37:52 +02:00
parent 251b3a47af
commit 33b6012827
8 changed files with 93 additions and 58 deletions
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61
crates/hir-def/src/adt.rs
View file

@ -3,6 +3,7 @@
use std::sync::Arc;
use base_db::CrateId;
use bitflags::bitflags;
use cfg::CfgOptions;
use either::Either;
@ -20,6 +21,7 @@ use crate::{
builtin_type::{BuiltinInt, BuiltinUint},
db::DefDatabase,
item_tree::{AttrOwner, Field, FieldAstId, Fields, ItemTree, ModItem, RawVisibilityId},
lang_item::LangItem,
layout::{Align, ReprFlags, ReprOptions},
nameres::diagnostics::DefDiagnostic,
src::HasChildSource,
@ -39,8 +41,26 @@ pub struct StructData {
pub variant_data: Arc<VariantData>,
pub repr: Option<ReprOptions>,
pub visibility: RawVisibility,
pub rustc_has_incoherent_inherent_impls: bool,
pub fundamental: bool,
pub flags: StructFlags,
}
bitflags! {
pub struct StructFlags: u8 {
const NO_FLAGS = 0;
/// Indicates whether the struct is `PhantomData`.
const IS_PHANTOM_DATA = 1 << 2;
/// Indicates whether the struct has a `#[fundamental]` attribute.
const IS_FUNDAMENTAL = 1 << 3;
// FIXME: should this be a flag?
/// Indicates whether the struct has a `#[rustc_has_incoherent_inherent_impls]` attribute.
const IS_RUSTC_HAS_INCOHERENT_INHERENT_IMPL = 1 << 4;
/// Indicates whether this struct is `Box`.
const IS_BOX = 1 << 5;
/// Indicates whether this struct is `ManuallyDrop`.
const IS_MANUALLY_DROP = 1 << 6;
/// Indicates whether this struct is `UnsafeCell`.
const IS_UNSAFE_CELL = 1 << 6;
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
@ -174,10 +194,25 @@ impl StructData {
let item_tree = loc.id.item_tree(db);
let repr = repr_from_value(db, krate, &item_tree, ModItem::from(loc.id.value).into());
let cfg_options = db.crate_graph()[loc.container.krate].cfg_options.clone();
let attrs = item_tree.attrs(db, loc.container.krate, ModItem::from(loc.id.value).into());
let rustc_has_incoherent_inherent_impls =
attrs.by_key("rustc_has_incoherent_inherent_impls").exists();
let fundamental = attrs.by_key("fundamental").exists();
let mut flags = StructFlags::NO_FLAGS;
if attrs.by_key("rustc_has_incoherent_inherent_impls").exists() {
flags |= StructFlags::IS_RUSTC_HAS_INCOHERENT_INHERENT_IMPL;
}
if attrs.by_key("fundamental").exists() {
flags |= StructFlags::IS_FUNDAMENTAL;
}
if let Some(lang) = attrs.lang_item() {
match lang {
LangItem::PhantomData => flags |= StructFlags::IS_PHANTOM_DATA,
LangItem::OwnedBox => flags |= StructFlags::IS_BOX,
LangItem::ManuallyDrop => flags |= StructFlags::IS_MANUALLY_DROP,
LangItem::UnsafeCell => flags |= StructFlags::IS_UNSAFE_CELL,
_ => (),
}
}
let strukt = &item_tree[loc.id.value];
let (variant_data, diagnostics) = lower_fields(
@ -196,8 +231,7 @@ impl StructData {
variant_data: Arc::new(variant_data),
repr,
visibility: item_tree[strukt.visibility].clone(),
rustc_has_incoherent_inherent_impls,
fundamental,
flags,
}),
diagnostics.into(),
)
@ -218,9 +252,13 @@ impl StructData {
let cfg_options = db.crate_graph()[loc.container.krate].cfg_options.clone();
let attrs = item_tree.attrs(db, loc.container.krate, ModItem::from(loc.id.value).into());
let rustc_has_incoherent_inherent_impls =
attrs.by_key("rustc_has_incoherent_inherent_impls").exists();
let fundamental = attrs.by_key("fundamental").exists();
let mut flags = StructFlags::NO_FLAGS;
if attrs.by_key("rustc_has_incoherent_inherent_impls").exists() {
flags |= StructFlags::IS_RUSTC_HAS_INCOHERENT_INHERENT_IMPL;
}
if attrs.by_key("fundamental").exists() {
flags |= StructFlags::IS_FUNDAMENTAL;
}
let union = &item_tree[loc.id.value];
let (variant_data, diagnostics) = lower_fields(
@ -239,8 +277,7 @@ impl StructData {
variant_data: Arc::new(variant_data),
repr,
visibility: item_tree[union.visibility].clone(),
rustc_has_incoherent_inherent_impls,
fundamental,
flags,
}),
diagnostics.into(),
)

13
crates/hir-def/src/attr.rs
View file

@ -20,6 +20,7 @@ use syntax::{
use crate::{
db::DefDatabase,
item_tree::{AttrOwner, Fields, ItemTreeId, ItemTreeNode},
lang_item::LangItem,
nameres::{ModuleOrigin, ModuleSource},
src::{HasChildSource, HasSource},
AdtId, AttrDefId, EnumId, GenericParamId, LocalEnumVariantId, LocalFieldId, Lookup, MacroId,
@ -175,13 +176,13 @@ impl Attrs {
Arc::new(res)
}
pub fn by_key(&self, key: &'static str) -> AttrQuery<'_> {
AttrQuery { attrs: self, key }
}
}
impl Attrs {
pub fn by_key(&self, key: &'static str) -> AttrQuery<'_> {
AttrQuery { attrs: self, key }
}
pub fn cfg(&self) -> Option<CfgExpr> {
let mut cfgs = self.by_key("cfg").tt_values().map(CfgExpr::parse);
let first = cfgs.next()?;
@ -204,6 +205,10 @@ impl Attrs {
self.by_key("lang").string_value()
}
pub fn lang_item(&self) -> Option<LangItem> {
self.by_key("lang").string_value().and_then(|it| LangItem::from_str(it))
}
pub fn docs(&self) -> Option<Documentation> {
let docs = self.by_key("doc").attrs().filter_map(|attr| attr.string_value());
let indent = doc_indent(self);

14
crates/hir-ty/src/autoderef.rs
View file

@ -4,10 +4,7 @@
//! logic in rustc (which lives in rustc_hir_analysis/check/autoderef.rs).
use chalk_ir::cast::Cast;
use hir_def::{
lang_item::{LangItem, LangItemTarget},
AdtId,
};
use hir_def::lang_item::LangItem;
use hir_expand::name::name;
use limit::Limit;
@ -90,13 +87,8 @@ pub(crate) fn builtin_deref<'ty>(
TyKind::Ref(.., ty) => Some(ty),
// FIXME: Maybe accept this but diagnose if its not explicit?
TyKind::Raw(.., ty) if explicit => Some(ty),
&TyKind::Adt(chalk_ir::AdtId(AdtId::StructId(strukt)), ref substs) => {
if Some(strukt)
== table
.db
.lang_item(table.trait_env.krate, LangItem::OwnedBox)
.and_then(LangItemTarget::as_struct)
{
&TyKind::Adt(chalk_ir::AdtId(adt), ref substs) => {
if crate::lang_items::is_box(table.db, adt) {
substs.at(Interner, 0).ty(Interner)
} else {
None

2
crates/hir-ty/src/diagnostics/match_check.rs
View file

@ -379,7 +379,7 @@ impl HirDisplay for Pat {
}
PatKind::Deref { subpattern } => {
match self.ty.kind(Interner) {
TyKind::Adt(adt, _) if is_box(adt.0, f.db) => write!(f, "box ")?,
TyKind::Adt(adt, _) if is_box(f.db, adt.0) => write!(f, "box ")?,
&TyKind::Ref(mutbl, ..) => {
write!(f, "&{}", if mutbl == Mutability::Mut { "mut " } else { "" })?
}

8
crates/hir-ty/src/diagnostics/match_check/deconstruct_pat.rs
View file

@ -384,7 +384,7 @@ impl Constructor {
TyKind::Tuple(arity, ..) => arity,
TyKind::Ref(..) => 1,
TyKind::Adt(adt, ..) => {
if is_box(adt.0, pcx.cx.db) {
if is_box(pcx.cx.db, adt.0) {
// The only legal patterns of type `Box` (outside `std`) are `_` and box
// patterns. If we're here we can assume this is a box pattern.
1
@ -800,7 +800,7 @@ impl<'p> Fields<'p> {
}
TyKind::Ref(.., rty) => Fields::wildcards_from_tys(cx, once(rty.clone())),
&TyKind::Adt(AdtId(adt), ref substs) => {
if is_box(adt, cx.db) {
if is_box(cx.db, adt) {
// The only legal patterns of type `Box` (outside `std`) are `_` and box
// patterns. If we're here we can assume this is a box pattern.
let subst_ty = substs.at(Interner, 0).assert_ty_ref(Interner).clone();
@ -905,7 +905,7 @@ impl<'p> DeconstructedPat<'p> {
}
fields = Fields::from_iter(cx, wilds)
}
TyKind::Adt(adt, substs) if is_box(adt.0, cx.db) => {
TyKind::Adt(adt, substs) if is_box(cx.db, adt.0) => {
// The only legal patterns of type `Box` (outside `std`) are `_` and box
// patterns. If we're here we can assume this is a box pattern.
// FIXME(Nadrieril): A `Box` can in theory be matched either with `Box(_,
@ -992,7 +992,7 @@ impl<'p> DeconstructedPat<'p> {
})
.collect(),
},
TyKind::Adt(adt, _) if is_box(adt.0, cx.db) => {
TyKind::Adt(adt, _) if is_box(cx.db, adt.0) => {
// Without `box_patterns`, the only legal pattern of type `Box` is `_` (outside
// of `std`). So this branch is only reachable when the feature is enabled and
// the pattern is a box pattern.

18
crates/hir-ty/src/lang_items.rs
View file

@ -1,22 +1,18 @@
//! Functions to detect special lang items
use hir_def::{lang_item::LangItem, AdtId, HasModule};
use hir_def::{adt::StructFlags, lang_item::LangItem, AdtId};
use hir_expand::name::Name;
use crate::db::HirDatabase;
pub fn is_box(adt: AdtId, db: &dyn HirDatabase) -> bool {
let krate = adt.module(db.upcast()).krate();
let box_adt =
db.lang_item(krate, LangItem::OwnedBox).and_then(|it| it.as_struct()).map(AdtId::from);
Some(adt) == box_adt
pub fn is_box(db: &dyn HirDatabase, adt: AdtId) -> bool {
let AdtId::StructId(id) = adt else { return false };
db.struct_data(id).flags.contains(StructFlags::IS_UNSAFE_CELL)
}
pub fn is_unsafe_cell(adt: AdtId, db: &dyn HirDatabase) -> bool {
let krate = adt.module(db.upcast()).krate();
let box_adt =
db.lang_item(krate, LangItem::UnsafeCell).and_then(|it| it.as_struct()).map(AdtId::from);
Some(adt) == box_adt
pub fn is_unsafe_cell(db: &dyn HirDatabase, adt: AdtId) -> bool {
let AdtId::StructId(id) = adt else { return false };
db.struct_data(id).flags.contains(StructFlags::IS_UNSAFE_CELL)
}
pub fn lang_items_for_bin_op(op: syntax::ast::BinaryOp) -> Option<(Name, LangItem)> {

2
crates/hir-ty/src/layout/adt.rs
View file

@ -71,7 +71,7 @@ pub fn layout_of_adt_query(
&repr,
&variants,
is_enum,
is_unsafe_cell(def, db),
is_unsafe_cell(db, def),
layout_scalar_valid_range(db, def),
|min, max| Integer::repr_discr(&dl, &repr, min, max).unwrap_or((Integer::I8, false)),
variants.iter_enumerated().filter_map(|(id, _)| {

33
crates/hir-ty/src/method_resolution.rs
View file

@ -7,8 +7,9 @@ use std::{ops::ControlFlow, sync::Arc};
use base_db::{CrateId, Edition};
use chalk_ir::{cast::Cast, Mutability, TyKind, UniverseIndex, WhereClause};
use hir_def::{
data::ImplData, item_scope::ItemScope, nameres::DefMap, AssocItemId, BlockId, ConstId,
FunctionId, HasModule, ImplId, ItemContainerId, Lookup, ModuleDefId, ModuleId, TraitId,
adt::StructFlags, data::ImplData, item_scope::ItemScope, nameres::DefMap, AssocItemId, BlockId,
ConstId, FunctionId, HasModule, ImplId, ItemContainerId, Lookup, ModuleDefId, ModuleId,
TraitId,
};
use hir_expand::name::Name;
use rustc_hash::{FxHashMap, FxHashSet};
@ -405,12 +406,14 @@ pub fn def_crates(
match ty.kind(Interner) {
&TyKind::Adt(AdtId(def_id), _) => {
let rustc_has_incoherent_inherent_impls = match def_id {
hir_def::AdtId::StructId(id) => {
db.struct_data(id).rustc_has_incoherent_inherent_impls
}
hir_def::AdtId::UnionId(id) => {
db.union_data(id).rustc_has_incoherent_inherent_impls
}
hir_def::AdtId::StructId(id) => db
.struct_data(id)
.flags
.contains(StructFlags::IS_RUSTC_HAS_INCOHERENT_INHERENT_IMPL),
hir_def::AdtId::UnionId(id) => db
.union_data(id)
.flags
.contains(StructFlags::IS_RUSTC_HAS_INCOHERENT_INHERENT_IMPL),
hir_def::AdtId::EnumId(id) => db.enum_data(id).rustc_has_incoherent_inherent_impls,
};
Some(if rustc_has_incoherent_inherent_impls {
@ -808,12 +811,14 @@ fn is_inherent_impl_coherent(
| TyKind::Scalar(_) => true,
&TyKind::Adt(AdtId(adt), _) => match adt {
hir_def::AdtId::StructId(it) => {
db.struct_data(it).rustc_has_incoherent_inherent_impls
}
hir_def::AdtId::UnionId(it) => {
db.union_data(it).rustc_has_incoherent_inherent_impls
}
hir_def::AdtId::StructId(id) => db
.struct_data(id)
.flags
.contains(StructFlags::IS_RUSTC_HAS_INCOHERENT_INHERENT_IMPL),
hir_def::AdtId::UnionId(id) => db
.union_data(id)
.flags
.contains(StructFlags::IS_RUSTC_HAS_INCOHERENT_INHERENT_IMPL),
hir_def::AdtId::EnumId(it) => db.enum_data(it).rustc_has_incoherent_inherent_impls,
},
TyKind::Dyn(it) => it.principal().map_or(false, |trait_ref| {