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|
//! `hir_def` crate contains everything between macro expansion and type
//! inference.
//!
//! It defines various items (structs, enums, traits) which comprises Rust code,
//! as well as an algorithm for resolving paths to such entities.
//!
//! Note that `hir_def` is a work in progress, so not all of the above is
//! actually true.
#[allow(unused)]
macro_rules! eprintln {
($($tt:tt)*) => { stdx::eprintln!($($tt)*) };
}
pub mod db;
pub mod attr;
pub mod path;
pub mod type_ref;
pub mod builtin_type;
pub mod builtin_attr;
pub mod diagnostics;
pub mod per_ns;
pub mod item_scope;
pub mod dyn_map;
pub mod keys;
pub mod item_tree;
pub mod adt;
pub mod data;
pub mod generics;
pub mod lang_item;
pub mod expr;
pub mod body;
pub mod resolver;
mod trace;
pub mod nameres;
pub mod src;
pub mod child_by_source;
pub mod visibility;
pub mod find_path;
pub mod import_map;
#[cfg(test)]
mod test_db;
use std::{
hash::{Hash, Hasher},
sync::Arc,
};
use base_db::{impl_intern_key, salsa, CrateId};
use hir_expand::{
ast_id_map::FileAstId,
eager::{expand_eager_macro, ErrorEmitted, ErrorSink},
hygiene::Hygiene,
AstId, HirFileId, InFile, MacroCallId, MacroCallKind, MacroDefId, MacroDefKind,
};
use la_arena::Idx;
use nameres::DefMap;
use syntax::ast;
use crate::builtin_type::BuiltinType;
use item_tree::{
Const, Enum, Function, Impl, ItemTreeId, ItemTreeNode, ModItem, Static, Struct, Trait,
TypeAlias, Union,
};
use stdx::impl_from;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct ModuleId {
krate: CrateId,
block: Option<BlockId>,
pub local_id: LocalModuleId,
}
impl ModuleId {
pub fn def_map(&self, db: &dyn db::DefDatabase) -> Arc<DefMap> {
match self.block {
Some(block) => {
db.block_def_map(block).unwrap_or_else(|| {
// NOTE: This should be unreachable - all `ModuleId`s come from their `DefMap`s,
// so the `DefMap` here must exist.
panic!("no `block_def_map` for `ModuleId` {:?}", self);
})
}
None => db.crate_def_map(self.krate),
}
}
pub fn krate(&self) -> CrateId {
self.krate
}
pub fn containing_module(&self, db: &dyn db::DefDatabase) -> Option<ModuleId> {
self.def_map(db).containing_module(self.local_id)
}
}
/// An ID of a module, **local** to a specific crate
pub type LocalModuleId = Idx<nameres::ModuleData>;
#[derive(Debug)]
pub struct ItemLoc<N: ItemTreeNode> {
pub container: ModuleId,
pub id: ItemTreeId<N>,
}
impl<N: ItemTreeNode> Clone for ItemLoc<N> {
fn clone(&self) -> Self {
Self { container: self.container, id: self.id }
}
}
impl<N: ItemTreeNode> Copy for ItemLoc<N> {}
impl<N: ItemTreeNode> PartialEq for ItemLoc<N> {
fn eq(&self, other: &Self) -> bool {
self.container == other.container && self.id == other.id
}
}
impl<N: ItemTreeNode> Eq for ItemLoc<N> {}
impl<N: ItemTreeNode> Hash for ItemLoc<N> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.container.hash(state);
self.id.hash(state);
}
}
#[derive(Debug)]
pub struct AssocItemLoc<N: ItemTreeNode> {
pub container: AssocContainerId,
pub id: ItemTreeId<N>,
}
impl<N: ItemTreeNode> Clone for AssocItemLoc<N> {
fn clone(&self) -> Self {
Self { container: self.container, id: self.id }
}
}
impl<N: ItemTreeNode> Copy for AssocItemLoc<N> {}
impl<N: ItemTreeNode> PartialEq for AssocItemLoc<N> {
fn eq(&self, other: &Self) -> bool {
self.container == other.container && self.id == other.id
}
}
impl<N: ItemTreeNode> Eq for AssocItemLoc<N> {}
impl<N: ItemTreeNode> Hash for AssocItemLoc<N> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.container.hash(state);
self.id.hash(state);
}
}
macro_rules! impl_intern {
($id:ident, $loc:ident, $intern:ident, $lookup:ident) => {
impl_intern_key!($id);
impl Intern for $loc {
type ID = $id;
fn intern(self, db: &dyn db::DefDatabase) -> $id {
db.$intern(self)
}
}
impl Lookup for $id {
type Data = $loc;
fn lookup(&self, db: &dyn db::DefDatabase) -> $loc {
db.$lookup(*self)
}
}
};
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct FunctionId(salsa::InternId);
type FunctionLoc = AssocItemLoc<Function>;
impl_intern!(FunctionId, FunctionLoc, intern_function, lookup_intern_function);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct StructId(salsa::InternId);
type StructLoc = ItemLoc<Struct>;
impl_intern!(StructId, StructLoc, intern_struct, lookup_intern_struct);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct UnionId(salsa::InternId);
pub type UnionLoc = ItemLoc<Union>;
impl_intern!(UnionId, UnionLoc, intern_union, lookup_intern_union);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct EnumId(salsa::InternId);
pub type EnumLoc = ItemLoc<Enum>;
impl_intern!(EnumId, EnumLoc, intern_enum, lookup_intern_enum);
// FIXME: rename to `VariantId`, only enums can ave variants
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct EnumVariantId {
pub parent: EnumId,
pub local_id: LocalEnumVariantId,
}
pub type LocalEnumVariantId = Idx<adt::EnumVariantData>;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct FieldId {
pub parent: VariantId,
pub local_id: LocalFieldId,
}
pub type LocalFieldId = Idx<adt::FieldData>;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct ConstId(salsa::InternId);
type ConstLoc = AssocItemLoc<Const>;
impl_intern!(ConstId, ConstLoc, intern_const, lookup_intern_const);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct StaticId(salsa::InternId);
pub type StaticLoc = ItemLoc<Static>;
impl_intern!(StaticId, StaticLoc, intern_static, lookup_intern_static);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct TraitId(salsa::InternId);
pub type TraitLoc = ItemLoc<Trait>;
impl_intern!(TraitId, TraitLoc, intern_trait, lookup_intern_trait);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct TypeAliasId(salsa::InternId);
type TypeAliasLoc = AssocItemLoc<TypeAlias>;
impl_intern!(TypeAliasId, TypeAliasLoc, intern_type_alias, lookup_intern_type_alias);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Ord, PartialOrd)]
pub struct ImplId(salsa::InternId);
type ImplLoc = ItemLoc<Impl>;
impl_intern!(ImplId, ImplLoc, intern_impl, lookup_intern_impl);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Ord, PartialOrd)]
pub struct BlockId(salsa::InternId);
#[derive(Debug, Hash, PartialEq, Eq, Clone)]
pub struct BlockLoc {
ast_id: AstId<ast::BlockExpr>,
/// The containing module.
module: ModuleId,
}
impl_intern!(BlockId, BlockLoc, intern_block, lookup_intern_block);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct TypeParamId {
pub parent: GenericDefId,
pub local_id: LocalTypeParamId,
}
pub type LocalTypeParamId = Idx<generics::TypeParamData>;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct LifetimeParamId {
pub parent: GenericDefId,
pub local_id: LocalLifetimeParamId,
}
pub type LocalLifetimeParamId = Idx<generics::LifetimeParamData>;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct ConstParamId {
pub parent: GenericDefId,
pub local_id: LocalConstParamId,
}
pub type LocalConstParamId = Idx<generics::ConstParamData>;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum AssocContainerId {
ModuleId(ModuleId),
ImplId(ImplId),
TraitId(TraitId),
}
impl_from!(ModuleId for AssocContainerId);
/// A Data Type
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub enum AdtId {
StructId(StructId),
UnionId(UnionId),
EnumId(EnumId),
}
impl_from!(StructId, UnionId, EnumId for AdtId);
/// A generic param
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub enum GenericParamId {
TypeParamId(TypeParamId),
LifetimeParamId(LifetimeParamId),
ConstParamId(ConstParamId),
}
impl_from!(TypeParamId, LifetimeParamId, ConstParamId for GenericParamId);
/// The defs which can be visible in the module.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum ModuleDefId {
ModuleId(ModuleId),
FunctionId(FunctionId),
AdtId(AdtId),
// Can't be directly declared, but can be imported.
EnumVariantId(EnumVariantId),
ConstId(ConstId),
StaticId(StaticId),
TraitId(TraitId),
TypeAliasId(TypeAliasId),
BuiltinType(BuiltinType),
}
impl_from!(
ModuleId,
FunctionId,
AdtId(StructId, EnumId, UnionId),
EnumVariantId,
ConstId,
StaticId,
TraitId,
TypeAliasId,
BuiltinType
for ModuleDefId
);
/// The defs which have a body.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum DefWithBodyId {
FunctionId(FunctionId),
StaticId(StaticId),
ConstId(ConstId),
}
impl_from!(FunctionId, ConstId, StaticId for DefWithBodyId);
impl DefWithBodyId {
pub fn as_generic_def_id(self) -> Option<GenericDefId> {
match self {
DefWithBodyId::FunctionId(f) => Some(f.into()),
DefWithBodyId::StaticId(_) => None,
DefWithBodyId::ConstId(c) => Some(c.into()),
}
}
}
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum AssocItemId {
FunctionId(FunctionId),
ConstId(ConstId),
TypeAliasId(TypeAliasId),
}
// FIXME: not every function, ... is actually an assoc item. maybe we should make
// sure that you can only turn actual assoc items into AssocItemIds. This would
// require not implementing From, and instead having some checked way of
// casting them, and somehow making the constructors private, which would be annoying.
impl_from!(FunctionId, ConstId, TypeAliasId for AssocItemId);
#[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
pub enum GenericDefId {
FunctionId(FunctionId),
AdtId(AdtId),
TraitId(TraitId),
TypeAliasId(TypeAliasId),
ImplId(ImplId),
// enum variants cannot have generics themselves, but their parent enums
// can, and this makes some code easier to write
EnumVariantId(EnumVariantId),
// consts can have type parameters from their parents (i.e. associated consts of traits)
ConstId(ConstId),
}
impl_from!(
FunctionId,
AdtId(StructId, EnumId, UnionId),
TraitId,
TypeAliasId,
ImplId,
EnumVariantId,
ConstId
for GenericDefId
);
impl From<AssocItemId> for GenericDefId {
fn from(item: AssocItemId) -> Self {
match item {
AssocItemId::FunctionId(f) => f.into(),
AssocItemId::ConstId(c) => c.into(),
AssocItemId::TypeAliasId(t) => t.into(),
}
}
}
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub enum AttrDefId {
ModuleId(ModuleId),
FieldId(FieldId),
AdtId(AdtId),
FunctionId(FunctionId),
EnumVariantId(EnumVariantId),
StaticId(StaticId),
ConstId(ConstId),
TraitId(TraitId),
TypeAliasId(TypeAliasId),
MacroDefId(MacroDefId),
ImplId(ImplId),
GenericParamId(GenericParamId),
}
impl_from!(
ModuleId,
FieldId,
AdtId(StructId, EnumId, UnionId),
EnumVariantId,
StaticId,
ConstId,
FunctionId,
TraitId,
TypeAliasId,
MacroDefId,
ImplId,
GenericParamId
for AttrDefId
);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum VariantId {
EnumVariantId(EnumVariantId),
StructId(StructId),
UnionId(UnionId),
}
impl_from!(EnumVariantId, StructId, UnionId for VariantId);
trait Intern {
type ID;
fn intern(self, db: &dyn db::DefDatabase) -> Self::ID;
}
pub trait Lookup {
type Data;
fn lookup(&self, db: &dyn db::DefDatabase) -> Self::Data;
}
pub trait HasModule {
fn module(&self, db: &dyn db::DefDatabase) -> ModuleId;
}
impl HasModule for AssocContainerId {
fn module(&self, db: &dyn db::DefDatabase) -> ModuleId {
match *self {
AssocContainerId::ModuleId(it) => it,
AssocContainerId::ImplId(it) => it.lookup(db).container,
AssocContainerId::TraitId(it) => it.lookup(db).container,
}
}
}
impl<N: ItemTreeNode> HasModule for AssocItemLoc<N> {
fn module(&self, db: &dyn db::DefDatabase) -> ModuleId {
self.container.module(db)
}
}
impl HasModule for AdtId {
fn module(&self, db: &dyn db::DefDatabase) -> ModuleId {
match self {
AdtId::StructId(it) => it.lookup(db).container,
AdtId::UnionId(it) => it.lookup(db).container,
AdtId::EnumId(it) => it.lookup(db).container,
}
}
}
impl HasModule for VariantId {
fn module(&self, db: &dyn db::DefDatabase) -> ModuleId {
match self {
VariantId::EnumVariantId(it) => it.parent.lookup(db).container,
VariantId::StructId(it) => it.lookup(db).container,
VariantId::UnionId(it) => it.lookup(db).container,
}
}
}
impl HasModule for DefWithBodyId {
fn module(&self, db: &dyn db::DefDatabase) -> ModuleId {
match self {
DefWithBodyId::FunctionId(it) => it.lookup(db).module(db),
DefWithBodyId::StaticId(it) => it.lookup(db).module(db),
DefWithBodyId::ConstId(it) => it.lookup(db).module(db),
}
}
}
impl DefWithBodyId {
pub fn as_mod_item(self, db: &dyn db::DefDatabase) -> ModItem {
match self {
DefWithBodyId::FunctionId(it) => it.lookup(db).id.value.into(),
DefWithBodyId::StaticId(it) => it.lookup(db).id.value.into(),
DefWithBodyId::ConstId(it) => it.lookup(db).id.value.into(),
}
}
}
impl HasModule for GenericDefId {
fn module(&self, db: &dyn db::DefDatabase) -> ModuleId {
match self {
GenericDefId::FunctionId(it) => it.lookup(db).module(db),
GenericDefId::AdtId(it) => it.module(db),
GenericDefId::TraitId(it) => it.lookup(db).container,
GenericDefId::TypeAliasId(it) => it.lookup(db).module(db),
GenericDefId::ImplId(it) => it.lookup(db).container,
GenericDefId::EnumVariantId(it) => it.parent.lookup(db).container,
GenericDefId::ConstId(it) => it.lookup(db).module(db),
}
}
}
impl HasModule for StaticLoc {
fn module(&self, _db: &dyn db::DefDatabase) -> ModuleId {
self.container
}
}
impl ModuleDefId {
/// Returns the module containing `self` (or `self`, if `self` is itself a module).
///
/// Returns `None` if `self` refers to a primitive type.
pub fn module(&self, db: &dyn db::DefDatabase) -> Option<ModuleId> {
Some(match self {
ModuleDefId::ModuleId(id) => *id,
ModuleDefId::FunctionId(id) => id.lookup(db).module(db),
ModuleDefId::AdtId(id) => id.module(db),
ModuleDefId::EnumVariantId(id) => id.parent.lookup(db).container,
ModuleDefId::ConstId(id) => id.lookup(db).container.module(db),
ModuleDefId::StaticId(id) => id.lookup(db).container,
ModuleDefId::TraitId(id) => id.lookup(db).container,
ModuleDefId::TypeAliasId(id) => id.lookup(db).module(db),
ModuleDefId::BuiltinType(_) => return None,
})
}
}
impl AttrDefId {
pub fn krate(&self, db: &dyn db::DefDatabase) -> CrateId {
match self {
AttrDefId::ModuleId(it) => it.krate,
AttrDefId::FieldId(it) => it.parent.module(db).krate,
AttrDefId::AdtId(it) => it.module(db).krate,
AttrDefId::FunctionId(it) => it.lookup(db).module(db).krate,
AttrDefId::EnumVariantId(it) => it.parent.lookup(db).container.krate,
AttrDefId::StaticId(it) => it.lookup(db).module(db).krate,
AttrDefId::ConstId(it) => it.lookup(db).module(db).krate,
AttrDefId::TraitId(it) => it.lookup(db).container.krate,
AttrDefId::TypeAliasId(it) => it.lookup(db).module(db).krate,
AttrDefId::ImplId(it) => it.lookup(db).container.krate,
AttrDefId::GenericParamId(it) => {
match it {
GenericParamId::TypeParamId(it) => it.parent,
GenericParamId::LifetimeParamId(it) => it.parent,
GenericParamId::ConstParamId(it) => it.parent,
}
.module(db)
.krate
}
// FIXME: `MacroDefId` should store the defining module, then this can implement
// `HasModule`
AttrDefId::MacroDefId(it) => it.krate,
}
}
}
/// A helper trait for converting to MacroCallId
pub trait AsMacroCall {
fn as_call_id(
&self,
db: &dyn db::DefDatabase,
krate: CrateId,
resolver: impl Fn(path::ModPath) -> Option<MacroDefId>,
) -> Option<MacroCallId> {
self.as_call_id_with_errors(db, krate, resolver, &mut |_| ()).ok()?.ok()
}
fn as_call_id_with_errors(
&self,
db: &dyn db::DefDatabase,
krate: CrateId,
resolver: impl Fn(path::ModPath) -> Option<MacroDefId>,
error_sink: &mut dyn FnMut(mbe::ExpandError),
) -> Result<Result<MacroCallId, ErrorEmitted>, UnresolvedMacro>;
}
impl AsMacroCall for InFile<&ast::MacroCall> {
fn as_call_id_with_errors(
&self,
db: &dyn db::DefDatabase,
krate: CrateId,
resolver: impl Fn(path::ModPath) -> Option<MacroDefId>,
mut error_sink: &mut dyn FnMut(mbe::ExpandError),
) -> Result<Result<MacroCallId, ErrorEmitted>, UnresolvedMacro> {
let ast_id = AstId::new(self.file_id, db.ast_id_map(self.file_id).ast_id(self.value));
let h = Hygiene::new(db.upcast(), self.file_id);
let path = self.value.path().and_then(|path| path::ModPath::from_src(path, &h));
let path = match error_sink
.option(path, || mbe::ExpandError::Other("malformed macro invocation".into()))
{
Ok(path) => path,
Err(error) => {
return Ok(Err(error));
}
};
macro_call_as_call_id(
&AstIdWithPath::new(ast_id.file_id, ast_id.value, path),
db,
krate,
resolver,
error_sink,
)
}
}
/// Helper wrapper for `AstId` with `ModPath`
#[derive(Clone, Debug, Eq, PartialEq)]
struct AstIdWithPath<T: ast::AstNode> {
ast_id: AstId<T>,
path: path::ModPath,
}
impl<T: ast::AstNode> AstIdWithPath<T> {
fn new(file_id: HirFileId, ast_id: FileAstId<T>, path: path::ModPath) -> AstIdWithPath<T> {
AstIdWithPath { ast_id: AstId::new(file_id, ast_id), path }
}
}
pub struct UnresolvedMacro;
fn macro_call_as_call_id(
call: &AstIdWithPath<ast::MacroCall>,
db: &dyn db::DefDatabase,
krate: CrateId,
resolver: impl Fn(path::ModPath) -> Option<MacroDefId>,
error_sink: &mut dyn FnMut(mbe::ExpandError),
) -> Result<Result<MacroCallId, ErrorEmitted>, UnresolvedMacro> {
let def: MacroDefId = resolver(call.path.clone()).ok_or(UnresolvedMacro)?;
let res = if let MacroDefKind::BuiltInEager(_) = def.kind {
let macro_call = InFile::new(call.ast_id.file_id, call.ast_id.to_node(db.upcast()));
let hygiene = Hygiene::new(db.upcast(), call.ast_id.file_id);
expand_eager_macro(
db.upcast(),
krate,
macro_call,
def,
&|path: ast::Path| resolver(path::ModPath::from_src(path, &hygiene)?),
error_sink,
)
.map(MacroCallId::from)
} else {
Ok(def.as_lazy_macro(db.upcast(), krate, MacroCallKind::FnLike(call.ast_id)).into())
};
Ok(res)
}
fn item_attr_as_call_id(
item_attr: &AstIdWithPath<ast::Item>,
db: &dyn db::DefDatabase,
krate: CrateId,
resolver: impl Fn(path::ModPath) -> Option<MacroDefId>,
) -> Result<MacroCallId, UnresolvedMacro> {
let def: MacroDefId = resolver(item_attr.path.clone()).ok_or(UnresolvedMacro)?;
let last_segment = item_attr.path.segments().last().ok_or(UnresolvedMacro)?;
let res = def
.as_lazy_macro(
db.upcast(),
krate,
MacroCallKind::Attr(item_attr.ast_id, last_segment.to_string()),
)
.into();
Ok(res)
}
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