wars_pit_plugin/lib.rs
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use std::{
borrow::Cow,
collections::{BTreeMap, BTreeSet},
convert::Infallible,
f32::consts::E,
iter::once,
sync::{Arc, Mutex, OnceLock},
};
use wars::*;
use pit_core::{Arg, Interface};
use proc_macro2::{Span, TokenStream};
use quasiquote::quasiquote;
use quote::{format_ident, quote, ToTokens};
use relooper::{reloop, BranchMode, ShapedBlock};
use sha3::Digest;
use syn::{Ident, Lifetime};
use waffle::{
cfg::CFGInfo, entity::EntityRef, Block, BlockTarget, Export, ExportKind, Func, ImportKind,
Memory, Module, Operator, Signature, SignatureData, Type, Value,
};
#[derive(Default)]
pub struct PitPlugin {
pub tpit: OnceLock<BTreeSet<pit_core::Interface>>,
pub extra: Vec<Arc<dyn PitPluginPlugin>>,
}
pub trait PitPluginPlugin {
fn choose_type(&self, opts: &Opts<Module<'static>>) -> anyhow::Result<Option<TokenStream>>;
fn emit_method(
&self,
opts: &Opts<Module<'static>>,
i: &Interface,
s: &str,
value: TokenStream,
params: &[TokenStream],
) -> anyhow::Result<TokenStream>;
fn post(&self, parent: &PitPlugin, opts: &Opts<Module<'static>>)
-> anyhow::Result<TokenStream>;
}
impl PitPlugin {
pub fn tpit(&self, opts: &Opts<Module<'static>>) -> &BTreeSet<Interface> {
return self.tpit.get_or_init(|| {
pit_patch::get_interfaces(&opts.module)
.unwrap()
.into_iter()
.collect()
});
}
pub fn host_tpit(&self, opts: &Opts<Module<'static>>) -> anyhow::Result<TokenStream> {
let mut a = opts.host_tpit();
let root = &opts.crate_path;
for e in self.extra.iter() {
if let Some(c) = e.choose_type(opts)? {
a = quote! {
#root::Either<#c,#a>
};
}
}
return Ok(a);
}
pub fn apply_host(
&self,
mut x: TokenStream,
opts: &Opts<Module<'static>>,
i: &Interface,
s: &str,
params: &[TokenStream],
) -> anyhow::Result<TokenStream> {
let root = &opts.crate_path;
for e in self.extra.iter() {
if let Some(c) = e.choose_type(opts)? {
x = quasiquote! {
match host{
#root::Either::Right(host) => #x,
#root::Either::Left(host) => #{e.emit_method(opts, i, s, quote! {host}, params)?},
}
};
}
}
return Ok(x);
}
pub fn wrap(
&self,
opts: &Opts<Module<'static>>,
mut x: TokenStream,
) -> anyhow::Result<TokenStream> {
let root = &opts.crate_path;
for e in self.extra.iter() {
if let Some(c) = e.choose_type(opts)? {
x = quasiquote! {
#root::Either::Right(#x)
};
}
}
return Ok(x);
}
}
impl Plugin for PitPlugin {
fn exref_bounds(&self, opts: &Opts<Module<'static>>) -> anyhow::Result<Option<TokenStream>> {
let root = &opts.crate_path;
Ok(Some(
quasiquote! {From<#root::Pit<Vec<#{opts.fp()}::Value<Self>>,#{self.host_tpit(opts)?}>> + TryInto<#root::Pit<Vec<#{opts.fp()}::Value<Self>>,#{self.host_tpit(opts)?}>>},
))
}
fn pre(&self, module: &mut Module<'static>) -> anyhow::Result<()> {
Ok(())
}
fn import(
&self,
opts: &Opts<Module<'static>>,
module: &str,
name: &str,
params: Vec<TokenStream>,
) -> anyhow::Result<Option<TokenStream>> {
let root = &opts.crate_path;
let mut params = params.into_iter();
if let Some(i) = module.strip_prefix("pit/") {
let x: [u8; 32] = hex::decode(i).unwrap().try_into().unwrap();
if let Some(s) = name.strip_prefix("~") {
let s = {
let mut h = sha3::Sha3_256::default();
h.update(s);
h.finalize()
};
return Ok(Some(quasiquote! {
#{opts.fp()}::ret(Ok(#{opts.fp()}::Value::<C>::ExternRef(#root::Pit::Guest{
id: [#(#x),*],
x: #{opts.fp()}::CoeVec::coe(#root::tuple_list::tuple_list!(#(#params),*)),
s: [#(#s),*],
}.into())))
}));
}
let mut f = params.next().unwrap();
// let id = format_ident!("{}", bindname(&format!("pit/{i}/~{PIT_NS}/{name}")));
// ctx.#id(x.x,#(#params),*)
let params = params.collect::<Vec<_>>();
let cases = opts
.module
.exports
.iter()
.filter_map(|x| x.name.strip_prefix(&format!("pit/{i}/~")))
.filter_map(|x| x.strip_suffix(&format!("/{name}")))
.map(|s| {
let id = format_ident!("{}", bindname(&format!("pit/{i}/~{s}/{name}")));
let s = {
let mut h = sha3::Sha3_256::default();
h.update(s);
h.finalize()
};
quasiquote! {
[#(#s),*] => {
let mut y = #{opts.fp()}::CoeVec::coe(#root::tuple_list::tuple_list!(#(#params),*));
y.extend(&mut x.clone());
ctx.#id(#{opts.fp()}::CoeVec::uncoe(y))
}
}
});
let interface = self.tpit(opts).iter().find(|a| a.rid() == x);
let meth = interface.and_then(|a| a.methods.get(name));
return Ok(Some(quasiquote! {
'a: {
let x = #f;
let #{opts.fp()}::Value::<C>::ExternRef(x) = x else{
break 'a #{opts.fp()}::ret(Err(#root::_rexport::anyhow::anyhow!("not an externref")))
};
let Ok(x) = x.try_into() else{
break 'a #{opts.fp()}::ret(Err(#root::_rexport::anyhow::anyhow!("not a pit externref")))
};
match x{
#root::Pit::Guest{s,x,id} => match s{
#(#cases),*,
_ => break 'a #{opts.fp()}::ret(Err(#root::_rexport::anyhow::anyhow!("invalid target")))
},
#root::Pit::Host{host} => #{let t = match opts.roots.get("tpit_rt"){
None => quote!{
match host{
}
},
Some(r) => quasiquote!{
let casted = unsafe{
host.cast::<Box<dyn #{format_ident!("R{}",i)}>>()
};
let a = casted.#{format_ident!("{name}")}(#{
let p = params.iter().zip(meth.unwrap().params.iter()).map(|(x,y)|match y{
Arg::Resource { ty, nullable, take, ann } => quasiquote!{
Box::new(Shim{wrapped: ctx, x: #x}).into()
},
_ => quote!{
#x
}
});
quote!{
#(#p),*
}
});
break 'a #{opts.fp()}::ret(Ok(#root::tuple_list::tuple_list!(#{
let r = meth.unwrap().rets.iter().enumerate().map(|(i,r)|{
let i = syn::Index{index: i as u32, span: Span::call_site()};
let i = quote!{
a.#i
};
match r{
Arg::Resource { ty, nullable, take, ann } => quote!{
#{opts.fp()}::Value::<C>::ExternRef(#root::Pit::Host{host: unsafe{i.cast()}})
},
_ => i
}
});
quote!{
#(#r),*
}
})));
}
};self.apply_host(t,opts,interface.unwrap(),name,¶ms)?}
_ => todo!()
}
}
}));
}
if module == "pit" && name == "drop" {
let mut f = params.next().unwrap();
let cases = opts
.module
.exports
.iter()
.filter_map(|x| {
let x = x.name.as_str();
let x = x.strip_prefix("pit/")?;
let (a, x) = x.split_once("/~")?;
let s = x.strip_suffix(".drop")?;
return Some((a, s));
})
.map(|(a, s)| {
let x = hex::decode(a).unwrap();
let id = format_ident!("{}", bindname(&format!("pit/{a}/~{s}.drop")));
let s = {
let mut h = sha3::Sha3_256::default();
h.update(s);
h.finalize()
};
// let id = format_ident!(
// "{}",
// bindname(&format!("pit/{}/~{PIT_NS}.drop", i.rid_str()))
// ); ctx.#id(x.x)
quasiquote!(
([#(#x),*],[#(#s),*]) => ctx.#id(#{opts.fp()}::CoeVec::uncoe(x))
)
});
return Ok(Some(quasiquote! {
'a: {
let x = #f;
let #{opts.fp()}::Value::<C>::ExternRef(x) = x else{
break 'a #{opts.fp()}::ret(Ok(()));
};
if let Ok(x) = x.try_into(){
match x{
#root::Pit::Guest{s,x,id} => => break 'a match (id,s){
#(#cases),*,
_ => #{opts.fp()}::ret(Ok(()))
},
#root::Pit::Host{host} => break 'a #{opts.fp()}::ret(Ok(()))
}
}else{
break 'a #{opts.fp()}::ret(Ok(()))
}
}
}));
};
return Ok(None);
}
fn post(&self, opts: &Opts<Module<'static>>) -> anyhow::Result<TokenStream> {
let root = &opts.crate_path;
let name = opts.name.clone();
let a = match opts.roots.get("tpit_rt") {
None => quote! {},
Some(tpit_rt) => quasiquote! {
impl<T: #name + ?Sized> Into<#tpit_rt::Tpit<()>> for Box<Shim<T>>{
fn into(self) -> #tpit_rt::Tpit<()>{
if let #{opts.fp()}::Value::<T>::ExternRef(e) = *self{
if let Ok(a) = e.try_into(){
if let #root::Pit::Host{host} = a{
return host;
}
}
}
Default::default()
}
}
impl<T: #name + ?Sized> Drop for Shim<T>{
fn drop(&mut self){
let ctx = unsafe{
&mut *self.wrapped
};
#root::rexport::tramp::tramp(#{opts.import("pit","drop",once(quote!{
self.x.clone()
}))?})
}
}
#{
let a = self.tpit(opts).iter().map(|i|{
let tname = format_ident!("R{}",i.rid_str());
let meths = i.methods.iter().map(|(a,b)|
Ok(quasiquote!{
fn #{format_ident!("{a}")}#{pit_rust_guest::render_sig(&pit_rust_guest::Opts { root: tpit_rt.clone(), salt: vec![], tpit: true },&tpit_rt.clone(),i,b,"e! {&mut self},false)}{
let ctx = unsafe{
&mut *self.wrapped
};
let res = #{opts.import(&format!("pit/{}",i.rid_str()),&format!("{a}"),once(Ok(quote!{self.x.clone()})).chain(b.params.iter().enumerate().map(|(i,p)|{
let i = format_ident!("p{i}");
Ok(match p{
Arg::Resource{ty,nullable,take,ann} => {
quote!{
#{opts.fp()}::Value::<C>::ExternRef(Pit::Host{host:#{self.wrap(opts,quasiquote!{
unsafe{
#i.cast()
}
})?}}.into())
}
}
_ => quote!{
#i
}
})
})).collect::<anyhow::Result<Vec<_>>>()?.into_iter())?};
let res = #root::rexport::tramp::tramp(res).unwrap().into_tuple()
;
#{ let r = b.rets.iter().enumerate().map(|(i,r)|{
let i = syn::Index{index: i as u32, span: Span::call_site()};
let i = quote!{
res.#i
};
match r{
Arg::Resource { ty, nullable, take, ann } => quote!{
Box::new(Shim{wrapped:self.wrapped,x: #i}).into()
},
_ => i
}
});
quote!{
#(#r),*
}}
}
})).collect::<anyhow::Result<Vec<_>>>()?;
Ok(quote!{
impl<C: #name + ?Sized> #tname for Shim<C>{
#(#meths),*
}
})
}).collect::<anyhow::Result<Vec<_>>>()?;
quote!{
#(#a)*
}
}
},
};
let bs = self
.extra
.iter()
.map(|x| x.post(self, opts))
.collect::<anyhow::Result<Vec<_>>>()?;
return Ok(quote! {
#a
#(#bs)*
});
}
}