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|
//! Defines hir-level representation of structs, enums and unions
use std::sync::Arc;
use either::Either;
use hir_expand::{
name::{AsName, Name},
InFile,
};
use ra_arena::{map::ArenaMap, Arena};
use ra_syntax::ast::{self, NameOwner, VisibilityOwner};
use tt::{Delimiter, DelimiterKind, Leaf, Subtree, TokenTree};
use crate::{
attr::AttrInput,
body::{CfgExpander, LowerCtx},
db::DefDatabase,
item_tree::{AttrOwner, Field, Fields, ItemTree, ModItem},
src::HasChildSource,
src::HasSource,
trace::Trace,
type_ref::TypeRef,
visibility::RawVisibility,
EnumId, HasModule, LocalEnumVariantId, LocalFieldId, Lookup, ModuleId, StructId, UnionId,
VariantId,
};
use ra_cfg::CfgOptions;
/// Note that we use `StructData` for unions as well!
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct StructData {
pub name: Name,
pub variant_data: Arc<VariantData>,
pub repr: Option<ReprKind>,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct EnumData {
pub name: Name,
pub variants: Arena<EnumVariantData>,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct EnumVariantData {
pub name: Name,
pub variant_data: Arc<VariantData>,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum VariantData {
Record(Arena<FieldData>),
Tuple(Arena<FieldData>),
Unit,
}
/// A single field of an enum variant or struct
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct FieldData {
pub name: Name,
pub type_ref: TypeRef,
pub visibility: RawVisibility,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ReprKind {
Packed,
Other,
}
fn repr_from_value(item_tree: &ItemTree, of: AttrOwner) -> Option<ReprKind> {
item_tree.attrs(of).iter().find_map(|a| {
if a.path.segments[0].to_string() == "repr" {
if let Some(AttrInput::TokenTree(subtree)) = &a.input {
parse_repr_tt(subtree)
} else {
None
}
} else {
None
}
})
}
fn parse_repr_tt(tt: &Subtree) -> Option<ReprKind> {
match tt.delimiter {
Some(Delimiter { kind: DelimiterKind::Parenthesis, .. }) => {}
_ => return None,
}
let mut it = tt.token_trees.iter();
match it.next() {
None => None,
Some(TokenTree::Leaf(Leaf::Ident(ident))) if ident.text == "packed" => {
Some(ReprKind::Packed)
}
_ => Some(ReprKind::Other),
}
}
impl StructData {
pub(crate) fn struct_data_query(db: &dyn DefDatabase, id: StructId) -> Arc<StructData> {
let loc = id.lookup(db);
let item_tree = db.item_tree(loc.id.file_id);
let repr = repr_from_value(&item_tree, ModItem::from(loc.id.value).into());
let cfg_options = db.crate_graph()[loc.container.module(db).krate].cfg_options.clone();
let strukt = &item_tree[loc.id.value];
let variant_data = lower_fields(&item_tree, &cfg_options, &strukt.fields);
Arc::new(StructData {
name: strukt.name.clone(),
variant_data: Arc::new(variant_data),
repr,
})
}
pub(crate) fn union_data_query(db: &dyn DefDatabase, id: UnionId) -> Arc<StructData> {
let loc = id.lookup(db);
let item_tree = db.item_tree(loc.id.file_id);
let repr = repr_from_value(&item_tree, ModItem::from(loc.id.value).into());
let cfg_options = db.crate_graph()[loc.container.module(db).krate].cfg_options.clone();
let union = &item_tree[loc.id.value];
let variant_data = lower_fields(&item_tree, &cfg_options, &union.fields);
Arc::new(StructData {
name: union.name.clone(),
variant_data: Arc::new(variant_data),
repr,
})
}
}
impl EnumData {
pub(crate) fn enum_data_query(db: &dyn DefDatabase, e: EnumId) -> Arc<EnumData> {
let loc = e.lookup(db);
let item_tree = db.item_tree(loc.id.file_id);
let cfg_options = db.crate_graph()[loc.container.module(db).krate].cfg_options.clone();
let enum_ = &item_tree[loc.id.value];
let mut variants = Arena::new();
for var_id in enum_.variants.clone() {
if item_tree.attrs(var_id.into()).is_cfg_enabled(&cfg_options) {
let var = &item_tree[var_id];
let var_data = lower_fields(&item_tree, &cfg_options, &var.fields);
variants.alloc(EnumVariantData {
name: var.name.clone(),
variant_data: Arc::new(var_data),
});
}
}
Arc::new(EnumData { name: enum_.name.clone(), variants })
}
pub fn variant(&self, name: &Name) -> Option<LocalEnumVariantId> {
let (id, _) = self.variants.iter().find(|(_id, data)| &data.name == name)?;
Some(id)
}
}
impl HasChildSource for EnumId {
type ChildId = LocalEnumVariantId;
type Value = ast::Variant;
fn child_source(&self, db: &dyn DefDatabase) -> InFile<ArenaMap<Self::ChildId, Self::Value>> {
let src = self.lookup(db).source(db);
let mut trace = Trace::new_for_map();
lower_enum(db, &mut trace, &src, self.lookup(db).container.module(db));
src.with_value(trace.into_map())
}
}
fn lower_enum(
db: &dyn DefDatabase,
trace: &mut Trace<EnumVariantData, ast::Variant>,
ast: &InFile<ast::Enum>,
module_id: ModuleId,
) {
let expander = CfgExpander::new(db, ast.file_id, module_id.krate);
let variants = ast
.value
.variant_list()
.into_iter()
.flat_map(|it| it.variants())
.filter(|var| expander.is_cfg_enabled(var));
for var in variants {
trace.alloc(
|| var.clone(),
|| EnumVariantData {
name: var.name().map_or_else(Name::missing, |it| it.as_name()),
variant_data: Arc::new(VariantData::new(db, ast.with_value(var.kind()), module_id)),
},
);
}
}
impl VariantData {
fn new(db: &dyn DefDatabase, flavor: InFile<ast::StructKind>, module_id: ModuleId) -> Self {
let mut expander = CfgExpander::new(db, flavor.file_id, module_id.krate);
let mut trace = Trace::new_for_arena();
match lower_struct(db, &mut expander, &mut trace, &flavor) {
StructKind::Tuple => VariantData::Tuple(trace.into_arena()),
StructKind::Record => VariantData::Record(trace.into_arena()),
StructKind::Unit => VariantData::Unit,
}
}
pub fn fields(&self) -> &Arena<FieldData> {
const EMPTY: &Arena<FieldData> = &Arena::new();
match &self {
VariantData::Record(fields) | VariantData::Tuple(fields) => fields,
_ => EMPTY,
}
}
pub fn field(&self, name: &Name) -> Option<LocalFieldId> {
self.fields().iter().find_map(|(id, data)| if &data.name == name { Some(id) } else { None })
}
pub fn kind(&self) -> StructKind {
match self {
VariantData::Record(_) => StructKind::Record,
VariantData::Tuple(_) => StructKind::Tuple,
VariantData::Unit => StructKind::Unit,
}
}
}
impl HasChildSource for VariantId {
type ChildId = LocalFieldId;
type Value = Either<ast::TupleField, ast::RecordField>;
fn child_source(&self, db: &dyn DefDatabase) -> InFile<ArenaMap<Self::ChildId, Self::Value>> {
let (src, module_id) = match self {
VariantId::EnumVariantId(it) => {
// I don't really like the fact that we call into parent source
// here, this might add to more queries then necessary.
let src = it.parent.child_source(db);
(src.map(|map| map[it.local_id].kind()), it.parent.lookup(db).container.module(db))
}
VariantId::StructId(it) => {
(it.lookup(db).source(db).map(|it| it.kind()), it.lookup(db).container.module(db))
}
VariantId::UnionId(it) => (
it.lookup(db).source(db).map(|it| {
it.record_field_list()
.map(ast::StructKind::Record)
.unwrap_or(ast::StructKind::Unit)
}),
it.lookup(db).container.module(db),
),
};
let mut expander = CfgExpander::new(db, src.file_id, module_id.krate);
let mut trace = Trace::new_for_map();
lower_struct(db, &mut expander, &mut trace, &src);
src.with_value(trace.into_map())
}
}
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum StructKind {
Tuple,
Record,
Unit,
}
fn lower_struct(
db: &dyn DefDatabase,
expander: &mut CfgExpander,
trace: &mut Trace<FieldData, Either<ast::TupleField, ast::RecordField>>,
ast: &InFile<ast::StructKind>,
) -> StructKind {
let ctx = LowerCtx::new(db, ast.file_id);
match &ast.value {
ast::StructKind::Tuple(fl) => {
for (i, fd) in fl.fields().enumerate() {
if !expander.is_cfg_enabled(&fd) {
continue;
}
trace.alloc(
|| Either::Left(fd.clone()),
|| FieldData {
name: Name::new_tuple_field(i),
type_ref: TypeRef::from_ast_opt(&ctx, fd.ty()),
visibility: RawVisibility::from_ast(db, ast.with_value(fd.visibility())),
},
);
}
StructKind::Tuple
}
ast::StructKind::Record(fl) => {
for fd in fl.fields() {
if !expander.is_cfg_enabled(&fd) {
continue;
}
trace.alloc(
|| Either::Right(fd.clone()),
|| FieldData {
name: fd.name().map(|n| n.as_name()).unwrap_or_else(Name::missing),
type_ref: TypeRef::from_ast_opt(&ctx, fd.ty()),
visibility: RawVisibility::from_ast(db, ast.with_value(fd.visibility())),
},
);
}
StructKind::Record
}
ast::StructKind::Unit => StructKind::Unit,
}
}
fn lower_fields(item_tree: &ItemTree, cfg_options: &CfgOptions, fields: &Fields) -> VariantData {
match fields {
Fields::Record(flds) => {
let mut arena = Arena::new();
for field_id in flds.clone() {
if item_tree.attrs(field_id.into()).is_cfg_enabled(cfg_options) {
arena.alloc(lower_field(item_tree, &item_tree[field_id]));
}
}
VariantData::Record(arena)
}
Fields::Tuple(flds) => {
let mut arena = Arena::new();
for field_id in flds.clone() {
if item_tree.attrs(field_id.into()).is_cfg_enabled(cfg_options) {
arena.alloc(lower_field(item_tree, &item_tree[field_id]));
}
}
VariantData::Tuple(arena)
}
Fields::Unit => VariantData::Unit,
}
}
fn lower_field(item_tree: &ItemTree, field: &Field) -> FieldData {
FieldData {
name: field.name.clone(),
type_ref: field.type_ref.clone(),
visibility: item_tree[field.visibility].clone(),
}
}
|