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Lift out the module scope into a field in the Resolver

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A Resolver *always* has a module scope at the end of its scope stack,
instead of encoding this as an invariant we can just lift this scope
out into a field, allowing us to skip going through the scope vec
indirection entirely.
This commit is contained in:
Lukas Wirth 2022-09-02 16:57:31 +02:00
parent 2bb6635a85
commit 8828049b23
6 changed files with 211 additions and 159 deletions
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11
crates/hir-def/src/body.rs
View file

@ -250,6 +250,10 @@ pub type PatSource = InFile<PatPtr>;
pub type LabelPtr = AstPtr<ast::Label>;
pub type LabelSource = InFile<LabelPtr>;
pub type FieldPtr = AstPtr<ast::RecordExprField>;
pub type FieldSource = InFile<FieldPtr>;
/// An item body together with the mapping from syntax nodes to HIR expression
/// IDs. This is needed to go from e.g. a position in a file to the HIR
/// expression containing it; but for type inference etc., we want to operate on
@ -274,8 +278,8 @@ pub struct BodySourceMap {
/// We don't create explicit nodes for record fields (`S { record_field: 92 }`).
/// Instead, we use id of expression (`92`) to identify the field.
field_map: FxHashMap<InFile<AstPtr<ast::RecordExprField>>, ExprId>,
field_map_back: FxHashMap<ExprId, InFile<AstPtr<ast::RecordExprField>>>,
field_map: FxHashMap<FieldSource, ExprId>,
field_map_back: FxHashMap<ExprId, FieldSource>,
expansions: FxHashMap<InFile<AstPtr<ast::MacroCall>>, HirFileId>,
@ -456,9 +460,10 @@ impl BodySourceMap {
self.label_map.get(&src).cloned()
}
pub fn field_syntax(&self, expr: ExprId) -> InFile<AstPtr<ast::RecordExprField>> {
pub fn field_syntax(&self, expr: ExprId) -> FieldSource {
self.field_map_back[&expr].clone()
}
pub fn node_field(&self, node: InFile<&ast::RecordExprField>) -> Option<ExprId> {
let src = node.map(AstPtr::new);
self.field_map.get(&src).cloned()

6
crates/hir-def/src/body/lower.rs
View file

@ -24,7 +24,7 @@ use syntax::{
use crate::{
adt::StructKind,
body::{Body, BodySourceMap, Expander, LabelSource, PatPtr},
body::{Body, BodySourceMap, Expander, ExprPtr, LabelPtr, LabelSource, PatPtr},
body::{BodyDiagnostic, ExprSource, PatSource},
builtin_type::{BuiltinFloat, BuiltinInt, BuiltinUint},
db::DefDatabase,
@ -150,7 +150,7 @@ impl ExprCollector<'_> {
LowerCtx::new(self.db, self.expander.current_file_id)
}
fn alloc_expr(&mut self, expr: Expr, ptr: AstPtr<ast::Expr>) -> ExprId {
fn alloc_expr(&mut self, expr: Expr, ptr: ExprPtr) -> ExprId {
let src = self.expander.to_source(ptr);
let id = self.make_expr(expr, src.clone());
self.source_map.expr_map.insert(src, id);
@ -185,7 +185,7 @@ impl ExprCollector<'_> {
id
}
fn alloc_label(&mut self, label: Label, ptr: AstPtr<ast::Label>) -> LabelId {
fn alloc_label(&mut self, label: Label, ptr: LabelPtr) -> LabelId {
let src = self.expander.to_source(ptr);
let id = self.make_label(label, src.clone());
self.source_map.label_map.insert(src, id);

31
crates/hir-def/src/body/scope.rs
View file

@ -47,16 +47,9 @@ pub struct ScopeData {
impl ExprScopes {
pub(crate) fn expr_scopes_query(db: &dyn DefDatabase, def: DefWithBodyId) -> Arc<ExprScopes> {
let body = db.body(def);
Arc::new(ExprScopes::new(&*body))
}
fn new(body: &Body) -> ExprScopes {
let mut scopes =
ExprScopes { scopes: Arena::default(), scope_by_expr: FxHashMap::default() };
let mut root = scopes.root_scope();
scopes.add_params_bindings(body, root, &body.params);
compute_expr_scopes(body.body_expr, body, &mut scopes, &mut root);
scopes
let mut scopes = ExprScopes::new(&*body);
scopes.shrink_to_fit();
Arc::new(scopes)
}
pub fn entries(&self, scope: ScopeId) -> &[ScopeEntry] {
@ -89,6 +82,17 @@ impl ExprScopes {
pub fn scope_by_expr(&self) -> &FxHashMap<ExprId, ScopeId> {
&self.scope_by_expr
}
}
impl ExprScopes {
fn new(body: &Body) -> ExprScopes {
let mut scopes =
ExprScopes { scopes: Arena::default(), scope_by_expr: FxHashMap::default() };
let mut root = scopes.root_scope();
scopes.add_params_bindings(body, root, &body.params);
compute_expr_scopes(body.body_expr, body, &mut scopes, &mut root);
scopes
}
fn root_scope(&mut self) -> ScopeId {
self.scopes.alloc(ScopeData { parent: None, block: None, label: None, entries: vec![] })
@ -138,6 +142,13 @@ impl ExprScopes {
fn set_scope(&mut self, node: ExprId, scope: ScopeId) {
self.scope_by_expr.insert(node, scope);
}
fn shrink_to_fit(&mut self) {
let ExprScopes { scopes, scope_by_expr } = self;
scopes.shrink_to_fit();
scopes.values_mut().for_each(|it| it.entries.shrink_to_fit());
scope_by_expr.shrink_to_fit();
}
}
fn compute_block_scopes(

282
crates/hir-def/src/resolver.rs
View file

@ -31,12 +31,10 @@ pub struct Resolver {
///
/// When using, you generally want to process the scopes in reverse order,
/// there's `scopes` *method* for that.
///
/// Invariant: There exists at least one Scope::ModuleScope at the start of the vec.
scopes: Vec<Scope>,
module_scope: ModuleItemMap,
}
// FIXME how to store these best
#[derive(Debug, Clone)]
struct ModuleItemMap {
def_map: Arc<DefMap>,
@ -53,7 +51,7 @@ struct ExprScope {
#[derive(Debug, Clone)]
enum Scope {
/// All the items and imported names of a module
ModuleScope(ModuleItemMap),
BlockScope(ModuleItemMap),
/// Brings the generic parameters of an item into scope
GenericParams { def: GenericDefId, params: Interned<GenericParams> },
/// Brings `Self` in `impl` block into scope
@ -127,24 +125,6 @@ impl Resolver {
}
}
fn scopes(&self) -> impl Iterator<Item = &Scope> {
self.scopes.iter().rev()
}
fn resolve_module_path(
&self,
db: &dyn DefDatabase,
path: &ModPath,
shadow: BuiltinShadowMode,
) -> PerNs {
let (item_map, module) = self.module_scope();
let (module_res, segment_index) = item_map.resolve_path(db, module, path, shadow);
if segment_index.is_some() {
return PerNs::none();
}
module_res
}
pub fn resolve_module_path_in_items(&self, db: &dyn DefDatabase, path: &ModPath) -> PerNs {
self.resolve_module_path(db, path, BuiltinShadowMode::Module)
}
@ -155,7 +135,7 @@ impl Resolver {
db: &dyn DefDatabase,
path: &ModPath,
) -> Option<PerNs> {
let (item_map, module) = self.module_scope();
let (item_map, module) = self.item_scope();
let (module_res, idx) = item_map.resolve_path(db, module, path, BuiltinShadowMode::Module);
match module_res.take_types()? {
ModuleDefId::TraitId(it) => {
@ -183,37 +163,38 @@ impl Resolver {
) -> Option<(TypeNs, Option<usize>)> {
let first_name = path.segments().first()?;
let skip_to_mod = path.kind != PathKind::Plain;
if skip_to_mod {
return self.module_scope.resolve_path_in_type_ns(db, path);
}
let remaining_idx = || if path.segments().len() == 1 { None } else { Some(1) };
for scope in self.scopes() {
match scope {
Scope::ExprScope(_) => continue,
Scope::GenericParams { .. } | Scope::ImplDefScope(_) if skip_to_mod => continue,
Scope::GenericParams { params, def } => {
if let Some(id) = params.find_type_by_name(first_name, *def) {
let idx = if path.segments().len() == 1 { None } else { Some(1) };
return Some((TypeNs::GenericParam(id), idx));
return Some((TypeNs::GenericParam(id), remaining_idx()));
}
}
Scope::ImplDefScope(impl_) => {
&Scope::ImplDefScope(impl_) => {
if first_name == &name![Self] {
let idx = if path.segments().len() == 1 { None } else { Some(1) };
return Some((TypeNs::SelfType(*impl_), idx));
return Some((TypeNs::SelfType(impl_), remaining_idx()));
}
}
Scope::AdtScope(adt) => {
&Scope::AdtScope(adt) => {
if first_name == &name![Self] {
let idx = if path.segments().len() == 1 { None } else { Some(1) };
return Some((TypeNs::AdtSelfType(*adt), idx));
return Some((TypeNs::AdtSelfType(adt), remaining_idx()));
}
}
Scope::ModuleScope(m) => {
Scope::BlockScope(m) => {
if let Some(res) = m.resolve_path_in_type_ns(db, path) {
return Some(res);
}
}
}
}
None
self.module_scope.resolve_path_in_type_ns(db, path)
}
pub fn resolve_path_in_type_ns_fully(
@ -235,7 +216,7 @@ impl Resolver {
) -> Option<Visibility> {
match visibility {
RawVisibility::Module(_) => {
let (item_map, module) = self.module_scope();
let (item_map, module) = self.item_scope();
item_map.resolve_visibility(db, module, visibility)
}
RawVisibility::Public => Some(Visibility::Public),
@ -251,18 +232,14 @@ impl Resolver {
let tmp = name![self];
let first_name = if path.is_self() { &tmp } else { path.segments().first()? };
let skip_to_mod = path.kind != PathKind::Plain && !path.is_self();
if skip_to_mod {
return self.module_scope.resolve_path_in_value_ns(db, path);
}
for scope in self.scopes() {
match scope {
Scope::AdtScope(_)
| Scope::ExprScope(_)
| Scope::GenericParams { .. }
| Scope::ImplDefScope(_)
if skip_to_mod =>
{
continue
}
Scope::ExprScope(scope) if n_segments <= 1 => {
Scope::ExprScope(_) if n_segments > 1 => continue,
Scope::ExprScope(scope) => {
let entry = scope
.expr_scopes
.entries(scope.scope_id)
@ -273,44 +250,39 @@ impl Resolver {
return Some(ResolveValueResult::ValueNs(ValueNs::LocalBinding(e.pat())));
}
}
Scope::ExprScope(_) => continue,
Scope::GenericParams { params, def } if n_segments > 1 => {
if let Some(id) = params.find_type_by_name(first_name, *def) {
let ty = TypeNs::GenericParam(id);
return Some(ResolveValueResult::Partial(ty, 1));
}
}
Scope::GenericParams { params, def } if n_segments == 1 => {
Scope::GenericParams { .. } if n_segments != 1 => continue,
Scope::GenericParams { params, def } => {
if let Some(id) = params.find_const_by_name(first_name, *def) {
let val = ValueNs::GenericParam(id);
return Some(ResolveValueResult::ValueNs(val));
}
}
Scope::GenericParams { .. } => continue,
Scope::ImplDefScope(impl_) => {
&Scope::ImplDefScope(impl_) => {
if first_name == &name![Self] {
if n_segments > 1 {
let ty = TypeNs::SelfType(*impl_);
return Some(ResolveValueResult::Partial(ty, 1));
return Some(if n_segments > 1 {
ResolveValueResult::Partial(TypeNs::SelfType(impl_), 1)
} else {
return Some(ResolveValueResult::ValueNs(ValueNs::ImplSelf(*impl_)));
}
ResolveValueResult::ValueNs(ValueNs::ImplSelf(impl_))
});
}
}
// bare `Self` doesn't work in the value namespace in a struct/enum definition
Scope::AdtScope(_) if n_segments == 1 => continue,
Scope::AdtScope(adt) => {
if n_segments == 1 {
// bare `Self` doesn't work in the value namespace in a struct/enum definition
continue;
}
if first_name == &name![Self] {
let ty = TypeNs::AdtSelfType(*adt);
return Some(ResolveValueResult::Partial(ty, 1));
}
}
Scope::ModuleScope(m) => {
Scope::BlockScope(m) => {
if let Some(def) = m.resolve_path_in_value_ns(db, path) {
return Some(def);
}
@ -318,15 +290,16 @@ impl Resolver {
}
}
if let res @ Some(_) = self.module_scope.resolve_path_in_value_ns(db, path) {
return res;
}
// If a path of the shape `u16::from_le_bytes` failed to resolve at all, then we fall back
// to resolving to the primitive type, to allow this to still work in the presence of
// `use core::u16;`.
if path.kind == PathKind::Plain && path.segments().len() > 1 {
match BuiltinType::by_name(&path.segments()[0]) {
Some(builtin) => {
return Some(ResolveValueResult::Partial(TypeNs::BuiltinType(builtin), 1));
}
None => {}
if let Some(builtin) = BuiltinType::by_name(&path.segments()[0]) {
return Some(ResolveValueResult::Partial(TypeNs::BuiltinType(builtin), 1));
}
}
@ -345,7 +318,7 @@ impl Resolver {
}
pub fn resolve_path_as_macro(&self, db: &dyn DefDatabase, path: &ModPath) -> Option<MacroId> {
let (item_map, module) = self.module_scope();
let (item_map, module) = self.item_scope();
item_map.resolve_path(db, module, path, BuiltinShadowMode::Other).0.take_macros()
}
@ -395,30 +368,34 @@ impl Resolver {
for scope in self.scopes() {
scope.process_names(&mut res, db);
}
process_module_scope_names(&mut res, db, &self.module_scope);
res.map
}
pub fn traits_in_scope(&self, db: &dyn DefDatabase) -> FxHashSet<TraitId> {
let mut traits = FxHashSet::default();
let collect_module_traits = |traits: &mut FxHashSet<_>, m: &ModuleItemMap| {
if let Some(prelude) = m.def_map.prelude() {
let prelude_def_map = prelude.def_map(db);
traits.extend(prelude_def_map[prelude.local_id].scope.traits());
}
traits.extend(m.def_map[m.module_id].scope.traits());
// Add all traits that are in scope because of the containing DefMaps
m.def_map.with_ancestor_maps(db, m.module_id, &mut |def_map, module| {
if let Some(prelude) = def_map.prelude() {
let prelude_def_map = prelude.def_map(db);
traits.extend(prelude_def_map[prelude.local_id].scope.traits());
}
traits.extend(def_map[module].scope.traits());
None::<()>
});
};
for scope in self.scopes() {
match scope {
Scope::ModuleScope(m) => {
if let Some(prelude) = m.def_map.prelude() {
let prelude_def_map = prelude.def_map(db);
traits.extend(prelude_def_map[prelude.local_id].scope.traits());
}
traits.extend(m.def_map[m.module_id].scope.traits());
// Add all traits that are in scope because of the containing DefMaps
m.def_map.with_ancestor_maps(db, m.module_id, &mut |def_map, module| {
if let Some(prelude) = def_map.prelude() {
let prelude_def_map = prelude.def_map(db);
traits.extend(prelude_def_map[prelude.local_id].scope.traits());
}
traits.extend(def_map[module].scope.traits());
None::<()>
});
}
Scope::BlockScope(m) => collect_module_traits(&mut traits, m),
&Scope::ImplDefScope(impl_) => {
if let Some(target_trait) = &db.impl_data(impl_).target_trait {
if let Some(TypeNs::TraitId(trait_)) =
@ -431,35 +408,22 @@ impl Resolver {
_ => (),
}
}
collect_module_traits(&mut traits, &self.module_scope);
traits
}
fn module_scope(&self) -> (&DefMap, LocalModuleId) {
self.scopes()
.find_map(|scope| match scope {
Scope::ModuleScope(m) => Some((&*m.def_map, m.module_id)),
_ => None,
})
.expect("module scope invariant violated")
}
pub fn module(&self) -> ModuleId {
let (def_map, local_id) = self.module_scope();
let (def_map, local_id) = self.item_scope();
def_map.module_id(local_id)
}
pub fn krate(&self) -> CrateId {
self.def_map().krate()
self.module_scope.def_map.krate()
}
pub fn def_map(&self) -> &DefMap {
self.scopes
.get(0)
.and_then(|scope| match scope {
Scope::ModuleScope(m) => Some(&m.def_map),
_ => None,
})
.expect("module scope invariant violated")
self.item_scope().0
}
pub fn where_predicates_in_scope(
@ -488,6 +452,36 @@ impl Resolver {
}
}
impl Resolver {
fn scopes(&self) -> impl Iterator<Item = &Scope> {
self.scopes.iter().rev()
}
fn resolve_module_path(
&self,
db: &dyn DefDatabase,
path: &ModPath,
shadow: BuiltinShadowMode,
) -> PerNs {
let (item_map, module) = self.item_scope();
let (module_res, segment_index) = item_map.resolve_path(db, module, path, shadow);
if segment_index.is_some() {
return PerNs::none();
}
module_res
}
/// The innermost block scope that contains items or the module scope that contains this resolver.
fn item_scope(&self) -> (&DefMap, LocalModuleId) {
self.scopes()
.find_map(|scope| match scope {
Scope::BlockScope(m) => Some((&*m.def_map, m.module_id)),
_ => None,
})
.unwrap_or((&self.module_scope.def_map, self.module_scope.module_id))
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum ScopeDef {
ModuleDef(ModuleDefId),
@ -499,41 +493,42 @@ pub enum ScopeDef {
Label(LabelId),
}
fn process_module_scope_names(acc: &mut ScopeNames, db: &dyn DefDatabase, m: &ModuleItemMap) {
// FIXME: should we provide `self` here?
// f(
// Name::self_param(),
// PerNs::types(Resolution::Def {
// def: m.module.into(),
// }),
// );
m.def_map[m.module_id].scope.entries().for_each(|(name, def)| {
acc.add_per_ns(name, def);
});
m.def_map[m.module_id].scope.legacy_macros().for_each(|(name, macs)| {
macs.iter().for_each(|&mac| {
acc.add(name, ScopeDef::ModuleDef(ModuleDefId::MacroId(MacroId::from(mac))));
})
});
m.def_map.extern_prelude().for_each(|(name, &def)| {
acc.add(name, ScopeDef::ModuleDef(ModuleDefId::ModuleId(def)));
});
if m.def_map.block_id().is_none() {
BUILTIN_SCOPE.iter().for_each(|(name, &def)| {
acc.add_per_ns(name, def);
});
}
if let Some(prelude) = m.def_map.prelude() {
let prelude_def_map = prelude.def_map(db);
for (name, def) in prelude_def_map[prelude.local_id].scope.entries() {
acc.add_per_ns(name, def)
}
}
}
impl Scope {
fn process_names(&self, acc: &mut ScopeNames, db: &dyn DefDatabase) {
match self {
Scope::ModuleScope(m) => {
// FIXME: should we provide `self` here?
// f(
// Name::self_param(),
// PerNs::types(Resolution::Def {
// def: m.module.into(),
// }),
// );
m.def_map[m.module_id].scope.entries().for_each(|(name, def)| {
acc.add_per_ns(name, def);
});
m.def_map[m.module_id].scope.legacy_macros().for_each(|(name, macs)| {
macs.iter().for_each(|&mac| {
acc.add(
name,
ScopeDef::ModuleDef(ModuleDefId::MacroId(MacroId::from(mac))),
);
})
});
m.def_map.extern_prelude().for_each(|(name, &def)| {
acc.add(name, ScopeDef::ModuleDef(ModuleDefId::ModuleId(def)));
});
BUILTIN_SCOPE.iter().for_each(|(name, &def)| {
acc.add_per_ns(name, def);
});
if let Some(prelude) = m.def_map.prelude() {
let prelude_def_map = prelude.def_map(db);
for (name, def) in prelude_def_map[prelude.local_id].scope.entries() {
acc.add_per_ns(name, def)
}
}
}
Scope::BlockScope(m) => process_module_scope_names(acc, db, m),
Scope::GenericParams { params, def: parent } => {
let parent = *parent;
for (local_id, param) in params.type_or_consts.iter() {
@ -596,7 +591,7 @@ pub fn resolver_for_scope(
if let Some(block) = scopes.block(scope) {
if let Some(def_map) = db.block_def_map(block) {
let root = def_map.root();
r = r.push_module_scope(def_map, root);
r = r.push_block_scope(def_map, root);
// FIXME: This adds as many module scopes as there are blocks, but resolving in each
// already traverses all parents, so this is O(n²). I think we could only store the
// innermost module scope instead?
@ -623,8 +618,8 @@ impl Resolver {
self.push_scope(Scope::ImplDefScope(impl_def))
}
fn push_module_scope(self, def_map: Arc<DefMap>, module_id: LocalModuleId) -> Resolver {
self.push_scope(Scope::ModuleScope(ModuleItemMap { def_map, module_id }))
fn push_block_scope(self, def_map: Arc<DefMap>, module_id: LocalModuleId) -> Resolver {
self.push_scope(Scope::BlockScope(ModuleItemMap { def_map, module_id }))
}
fn push_expr_scope(
@ -768,14 +763,19 @@ pub trait HasResolver: Copy {
impl HasResolver for ModuleId {
fn resolver(self, db: &dyn DefDatabase) -> Resolver {
let mut def_map = self.def_map(db);
let mut modules: SmallVec<[_; 2]> = smallvec![(def_map.clone(), self.local_id)];
let mut modules: SmallVec<[_; 1]> = smallvec![];
let mut module_id = self.local_id;
while let Some(parent) = def_map.parent() {
modules.push((def_map, module_id));
def_map = parent.def_map(db);
modules.push((def_map.clone(), parent.local_id));
module_id = parent.local_id;
}
let mut resolver = Resolver { scopes: Vec::with_capacity(modules.len()) };
let mut resolver = Resolver {
scopes: Vec::with_capacity(modules.len()),
module_scope: ModuleItemMap { def_map, module_id },
};
for (def_map, module) in modules.into_iter().rev() {
resolver = resolver.push_module_scope(def_map, module);
resolver = resolver.push_block_scope(def_map, module);
}
resolver
}

3
crates/hir-ty/src/autoderef.rs
View file

@ -104,8 +104,7 @@ pub(crate) fn deref(table: &mut InferenceTable<'_>, ty: Ty) -> Option<Ty> {
fn builtin_deref(ty: &Ty) -> Option<&Ty> {
match ty.kind(Interner) {
TyKind::Ref(.., ty) => Some(ty),
TyKind::Raw(.., ty) => Some(ty),
TyKind::Ref(.., ty) | TyKind::Raw(.., ty) => Some(ty),
_ => None,
}
}

37
lib/la-arena/src/lib.rs
View file

@ -322,6 +322,43 @@ impl<T> Arena<T> {
.map(|(idx, value)| (Idx::from_raw(RawIdx(idx as u32)), value))
}
/// Returns an iterator over the arena’s values.
///
/// ```
/// let mut arena = la_arena::Arena::new();
/// let idx1 = arena.alloc(20);
/// let idx2 = arena.alloc(40);
/// let idx3 = arena.alloc(60);
///
/// let mut iterator = arena.values();
/// assert_eq!(iterator.next(), Some(&20));
/// assert_eq!(iterator.next(), Some(&40));
/// assert_eq!(iterator.next(), Some(&60));
/// ```
pub fn values(&mut self) -> impl Iterator<Item = &T> + ExactSizeIterator + DoubleEndedIterator {
self.data.iter()
}
/// Returns an iterator over the arena’s mutable values.
///
/// ```
/// let mut arena = la_arena::Arena::new();
/// let idx1 = arena.alloc(20);
///
/// assert_eq!(arena[idx1], 20);
///
/// let mut iterator = arena.values_mut();
/// *iterator.next().unwrap() = 10;
/// drop(iterator);
///
/// assert_eq!(arena[idx1], 10);
/// ```
pub fn values_mut(
&mut self,
) -> impl Iterator<Item = &mut T> + ExactSizeIterator + DoubleEndedIterator {
self.data.iter_mut()
}
/// Reallocates the arena to make it take up as little space as possible.
pub fn shrink_to_fit(&mut self) {
self.data.shrink_to_fit();