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use crate::{WasmInterfaceTypes, WitIdsToIndices, WitIndicesToIds};
use anyhow::Result;
use id_arena::{Arena, Id};
#[derive(Debug, Default)]
pub struct Types {
arena: Arena<Type>,
}
#[derive(Debug)]
pub struct Type {
id: TypeId,
params: Box<[ValType]>,
results: Box<[ValType]>,
}
pub type TypeId = Id<Type>;
#[derive(Debug, Copy, Clone)]
pub enum ValType {
S8,
S16,
S32,
S64,
U8,
U16,
U32,
U64,
F32,
F64,
String,
Externref,
I32,
I64,
}
impl WasmInterfaceTypes {
pub(crate) fn parse_types(
&mut self,
types: wit_parser::Types,
wids: &mut WitIndicesToIds,
) -> Result<()> {
for ty in types {
let ty = ty?;
let id = self.types.add(
ty.params.iter().cloned().map(parse2walrus).collect(),
ty.results.iter().cloned().map(parse2walrus).collect(),
);
wids.types.push(id);
}
Ok(())
}
pub(crate) fn encode_types(&self, writer: &mut wit_writer::Writer, wids: &mut WitIdsToIndices) {
let mut w = writer.types(self.types.arena.len() as u32);
for (id, ty) in self.types.arena.iter() {
w.add(
ty.params.len() as u32,
|w| {
for param in ty.params.iter() {
write_ty(w, param);
}
},
ty.results.len() as u32,
|w| {
for result in ty.results.iter() {
write_ty(w, result);
}
},
);
wids.push_ty(id);
}
fn write_ty(w: &mut wit_writer::Type<'_>, ty: &ValType) {
match ty {
ValType::S8 => w.s8(),
ValType::S16 => w.s16(),
ValType::S32 => w.s32(),
ValType::S64 => w.s64(),
ValType::U8 => w.u8(),
ValType::U16 => w.u16(),
ValType::U32 => w.u32(),
ValType::U64 => w.u64(),
ValType::F32 => w.f32(),
ValType::F64 => w.f64(),
ValType::String => w.string(),
ValType::Externref => w.externref(),
ValType::I32 => w.i32(),
ValType::I64 => w.i64(),
}
}
}
}
fn parse2walrus(parse: wit_parser::ValType) -> ValType {
match parse {
wit_parser::ValType::S8 => ValType::S8,
wit_parser::ValType::S16 => ValType::S16,
wit_parser::ValType::S32 => ValType::S32,
wit_parser::ValType::S64 => ValType::S64,
wit_parser::ValType::U8 => ValType::U8,
wit_parser::ValType::U16 => ValType::U16,
wit_parser::ValType::U32 => ValType::U32,
wit_parser::ValType::U64 => ValType::U64,
wit_parser::ValType::F32 => ValType::F32,
wit_parser::ValType::F64 => ValType::F64,
wit_parser::ValType::String => ValType::String,
wit_parser::ValType::Externref => ValType::Externref,
wit_parser::ValType::I32 => ValType::I32,
wit_parser::ValType::I64 => ValType::I64,
}
}
impl Types {
pub fn get(&self, id: TypeId) -> &Type {
&self.arena[id]
}
pub fn get_mut(&mut self, id: TypeId) -> &mut Type {
&mut self.arena[id]
}
pub fn iter(&self) -> impl Iterator<Item = &Type> {
self.arena.iter().map(|(_, f)| f)
}
pub fn iter_mut(&mut self) -> impl Iterator<Item = &mut Type> {
self.arena.iter_mut().map(|(_, f)| f)
}
pub fn add(&mut self, params: Vec<ValType>, results: Vec<ValType>) -> TypeId {
self.arena.alloc_with_id(|id| Type {
id,
params: params.into_boxed_slice(),
results: results.into_boxed_slice(),
})
}
}
impl Type {
pub fn id(&self) -> TypeId {
self.id
}
pub fn params(&self) -> &[ValType] {
&self.params
}
pub fn results(&self) -> &[ValType] {
&self.results
}
}