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|
use std::collections::HashMap;
use wit_parser::*;
#[derive(Default)]
pub struct Types {
type_info: HashMap<TypeId, TypeInfo>,
}
#[derive(Default, Clone, Copy, Debug, PartialEq)]
pub struct TypeInfo {
/// Whether or not this type is ever used (transitively) within a borrowed
/// context, or a parameter to an export function.
pub borrowed: bool,
/// Whether or not this type is ever used (transitively) within an owned
/// context, such as the result of an exported function or in the params or
/// results of an imported function.
pub owned: bool,
/// Whether or not this type is ever used (transitively) within the
/// error case in the result of a function.
pub error: bool,
/// Whether or not this type (transitively) has a list.
pub has_list: bool,
/// Whether or not this type (transitively) has a handle.
pub has_handle: bool,
}
impl std::ops::BitOrAssign for TypeInfo {
fn bitor_assign(&mut self, rhs: Self) {
self.borrowed |= rhs.borrowed;
self.owned |= rhs.owned;
self.error |= rhs.error;
self.has_list |= rhs.has_list;
self.has_handle |= rhs.has_handle;
}
}
impl Types {
pub fn analyze(&mut self, resolve: &Resolve, world: WorldId) {
// Build up all type information first which is inherited through types,
// such as properties of borrows/lists/etc.
for (t, _) in resolve.types.iter() {
self.type_id_info(resolve, t);
}
// ... next handle borrowed/owned flags which aren't inherited through
// types.
let world = &resolve.worlds[world];
for (import, (_, item)) in world
.imports
.iter()
.map(|i| (true, i))
.chain(world.exports.iter().map(|i| (false, i)))
{
match item {
WorldItem::Function(f) => self.type_info_func(resolve, f, import),
WorldItem::Interface { id, .. } => {
let iface = &resolve.interfaces[*id];
for (_, t) in iface.types.iter() {
self.type_id_info(resolve, *t);
}
for (_, f) in iface.functions.iter() {
self.type_info_func(resolve, f, import);
}
}
WorldItem::Type(id) => {
self.type_id_info(resolve, *id);
}
}
}
}
fn type_info_func(&mut self, resolve: &Resolve, func: &Function, import: bool) {
let mut live = LiveTypes::default();
for (_, ty) in func.params.iter() {
self.type_info(resolve, ty);
live.add_type(resolve, ty);
}
for id in live.iter() {
if resolve.types[id].name.is_some() {
let info = self.type_info.get_mut(&id).unwrap();
if import {
info.owned = true;
} else {
info.borrowed = true;
}
}
}
let mut live = LiveTypes::default();
for ty in func.results.iter_types() {
self.type_info(resolve, ty);
live.add_type(resolve, ty);
}
for id in live.iter() {
if resolve.types[id].name.is_some() {
self.type_info.get_mut(&id).unwrap().owned = true;
}
}
for ty in func.results.iter_types() {
let id = match ty {
Type::Id(id) => *id,
_ => continue,
};
let err = match &resolve.types[id].kind {
TypeDefKind::Result(Result_ { err, .. }) => err,
_ => continue,
};
if let Some(Type::Id(id)) = err {
let id = super::resolve_type_definition_id(resolve, *id);
self.type_info.get_mut(&id).unwrap().error = true;
}
}
}
pub fn get(&self, id: TypeId) -> TypeInfo {
self.type_info[&id]
}
fn type_id_info(&mut self, resolve: &Resolve, ty: TypeId) -> TypeInfo {
if let Some(info) = self.type_info.get(&ty) {
return *info;
}
let mut info = TypeInfo::default();
match &resolve.types[ty].kind {
TypeDefKind::Record(r) => {
for field in r.fields.iter() {
info |= self.type_info(resolve, &field.ty);
}
}
TypeDefKind::Tuple(t) => {
for ty in t.types.iter() {
info |= self.type_info(resolve, ty);
}
}
TypeDefKind::Flags(_) => {}
TypeDefKind::Enum(_) => {}
TypeDefKind::Variant(v) => {
for case in v.cases.iter() {
info |= self.optional_type_info(resolve, case.ty.as_ref());
}
}
TypeDefKind::List(ty) => {
info = self.type_info(resolve, ty);
info.has_list = true;
}
TypeDefKind::Type(ty) => {
info = self.type_info(resolve, ty);
}
TypeDefKind::Option(ty) => {
info = self.type_info(resolve, ty);
}
TypeDefKind::Result(r) => {
info = self.optional_type_info(resolve, r.ok.as_ref());
info |= self.optional_type_info(resolve, r.err.as_ref());
}
TypeDefKind::Future(ty) => {
info = self.optional_type_info(resolve, ty.as_ref());
}
TypeDefKind::Stream(stream) => {
info = self.optional_type_info(resolve, stream.element.as_ref());
info |= self.optional_type_info(resolve, stream.end.as_ref());
}
TypeDefKind::Handle(_) => info.has_handle = true,
TypeDefKind::Resource => {}
TypeDefKind::Unknown => unreachable!(),
}
self.type_info.insert(ty, info);
info
}
fn type_info(&mut self, resolve: &Resolve, ty: &Type) -> TypeInfo {
let mut info = TypeInfo::default();
match ty {
Type::String => info.has_list = true,
Type::Id(id) => return self.type_id_info(resolve, *id),
_ => {}
}
info
}
fn optional_type_info(&mut self, resolve: &Resolve, ty: Option<&Type>) -> TypeInfo {
match ty {
Some(ty) => self.type_info(resolve, ty),
None => TypeInfo::default(),
}
}
}
impl TypeInfo {
pub fn is_copy(&self) -> bool {
!self.has_list && !self.has_handle
}
pub fn is_clone(&self) -> bool {
!self.has_handle
}
}
|
