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use crate::emit::{Emit, EmitContext};
use crate::encode::Encoder;
use crate::error::Result;
use crate::tombstone_arena::Tombstone;
use id_arena::Id;
use std::fmt;
use std::hash;
pub type TypeId = Id<Type>;
#[derive(Debug, Clone)]
pub struct Type {
id: TypeId,
params: Box<[ValType]>,
results: Box<[ValType]>,
pub name: Option<String>,
}
impl PartialEq for Type {
#[inline]
fn eq(&self, rhs: &Type) -> bool {
self.params == rhs.params && self.results == rhs.results
}
}
impl Eq for Type {}
impl hash::Hash for Type {
#[inline]
fn hash<H: hash::Hasher>(&self, h: &mut H) {
self.params.hash(h);
self.results.hash(h)
}
}
impl Tombstone for Type {
fn on_delete(&mut self) {
self.params = Box::new([]);
self.results = Box::new([]);
}
}
impl Type {
#[inline]
pub fn new(id: TypeId, params: Box<[ValType]>, results: Box<[ValType]>) -> Type {
Type {
id,
params,
results,
name: None,
}
}
#[inline]
pub fn id(&self) -> TypeId {
self.id
}
#[inline]
pub fn params(&self) -> &[ValType] {
&*self.params
}
#[inline]
pub fn results(&self) -> &[ValType] {
&*self.results
}
}
impl Emit for Type {
fn emit(&self, cx: &mut EmitContext) {
cx.encoder.byte(0x60);
cx.list(self.params.iter());
cx.list(self.results.iter());
}
}
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub enum ValType {
I32,
I64,
F32,
F64,
V128,
Anyref,
}
impl ValType {
pub fn from_block_ty(block_ty: wasmparser::Type) -> Result<Box<[ValType]>> {
let v = match block_ty {
wasmparser::Type::EmptyBlockType => Vec::new(),
_ => vec![ValType::parse(&block_ty)?],
};
Ok(v.into_boxed_slice())
}
pub(crate) fn parse(input: &wasmparser::Type) -> Result<ValType> {
match input {
wasmparser::Type::I32 => Ok(ValType::I32),
wasmparser::Type::I64 => Ok(ValType::I64),
wasmparser::Type::F32 => Ok(ValType::F32),
wasmparser::Type::F64 => Ok(ValType::F64),
wasmparser::Type::V128 => Ok(ValType::V128),
wasmparser::Type::AnyRef => Ok(ValType::Anyref),
_ => failure::bail!("not a value type"),
}
}
pub(crate) fn emit(&self, encoder: &mut Encoder) {
match self {
ValType::I32 => encoder.byte(0x7f),
ValType::I64 => encoder.byte(0x7e),
ValType::F32 => encoder.byte(0x7d),
ValType::F64 => encoder.byte(0x7c),
ValType::V128 => encoder.byte(0x7b),
ValType::Anyref => encoder.byte(0x6f),
}
}
}
impl fmt::Display for ValType {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"{}",
match self {
ValType::I32 => "i32",
ValType::I64 => "i64",
ValType::F32 => "f32",
ValType::F64 => "f64",
ValType::V128 => "v128",
ValType::Anyref => "anyref",
}
)
}
}
impl Emit for ValType {
fn emit(&self, cx: &mut EmitContext) {
self.emit(&mut cx.encoder);
}
}