mirror of
https://github.com/fluencelabs/wasm-bindgen
synced 2025-04-06 12:21:06 +00:00
cdbb31f3a9
This commit starts wasm-bindgen down a path of removing the special casing it currently has around vectors, slices, and strings. This has long been a thorn in wasm-bindgen's side as it doesn't handle other kinds of vectors and otherwise is very inflexible with future additions. Additionally it leads to a lot of duplicated-ish code throughout various portions of codegen. The fundamental reason for this was that two arguments were required to be passed back to wasm, and I couldn't figure out a way to shove both those arguments into a function argument. The new strategy here is that there is one global stack well known to both JS and Rust which arguments *may* also be transferred between. By default all ABI arguments pass as literal function arguments, but if two or more arguments need to be passed then the extra ones are all passed through this global stack. The stack is effectively temporary scratch space when crossing the JS/Rust boundary (both ways). No long term storage is intended here. The `simple` test is passing as a result of this commit, using strings internally. The `Vector` type in the AST has been removed (yay!) and the bulk of the implementation of slices and vectors now resides in the `wasm-bindgen` crate itself, defining how to pass all these arguments around. The JS generator, however, still needs to know about all the sorts of vectors so it can generate appropriate code for JS. Future commits will continue cleanup and get the rest of the tests working.
626 lines
23 KiB
Rust
626 lines
23 KiB
Rust
use ast;
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use quote::{ToTokens, Tokens};
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use proc_macro2::Span;
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use shared;
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use std::borrow::Cow;
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use std::collections::HashSet;
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use std::env;
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use std::sync::atomic::{ATOMIC_USIZE_INIT, AtomicUsize, Ordering};
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use syn;
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fn to_ident_name(s: &str) -> Cow<str> {
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if s.chars().all(|c| match c {
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'a'...'z' | 'A'...'Z' | '0'...'9' | '_' => true,
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_ => false,
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}) {
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return Cow::from(s);
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}
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Cow::from(
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s.chars()
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.map(|c| match c {
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'a'...'z' | 'A'...'Z' | '0'...'9' | '_' => c,
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_ => '_',
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})
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.collect::<String>(),
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)
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}
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impl ToTokens for ast::Program {
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// Generate wrappers for all the items that we've found
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fn to_tokens(&self, tokens: &mut Tokens) {
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for export in self.exports.iter() {
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export.to_tokens(tokens);
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}
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for s in self.structs.iter() {
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s.to_tokens(tokens);
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}
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let mut types = HashSet::new();
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for i in self.imports.iter() {
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if let ast::ImportKind::Type(ref t) = i.kind {
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types.insert(t.name);
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}
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}
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for i in self.imports.iter() {
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match i.js_namespace {
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Some(ns) if types.contains(&ns) => {
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let kind = &i.kind;
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(quote! { impl #ns { #kind } }).to_tokens(tokens);
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}
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_ => i.kind.to_tokens(tokens),
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}
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}
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for e in self.enums.iter() {
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e.to_tokens(tokens);
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}
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// Generate a static which will eventually be what lives in a custom section
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// of the wasm executable. For now it's just a plain old static, but we'll
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// eventually have it actually in its own section.
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static CNT: AtomicUsize = ATOMIC_USIZE_INIT;
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let crate_name = env::var("CARGO_PKG_NAME").expect("should have CARGO_PKG_NAME env var");
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let crate_vers =
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env::var("CARGO_PKG_VERSION").expect("should have CARGO_PKG_VERSION env var");
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let generated_static_name = format!(
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"__WASM_BINDGEN_GENERATED_{}_{}_{}",
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to_ident_name(&crate_name),
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to_ident_name(&crate_vers),
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CNT.fetch_add(1, Ordering::SeqCst)
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);
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let generated_static_name = syn::Ident::from(generated_static_name);
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let mut generated_static_value = Tokens::new();
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let generated_static_length = self.literal(&mut generated_static_value);
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(my_quote! {
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#[allow(non_upper_case_globals)]
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#[wasm_custom_section = "__wasm_bindgen_unstable"]
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const #generated_static_name: [u8; #generated_static_length] =
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[#generated_static_value];
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}).to_tokens(tokens);
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}
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}
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impl ToTokens for ast::Struct {
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fn to_tokens(&self, tokens: &mut Tokens) {
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let name = &self.name;
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let free_fn = syn::Ident::from(shared::free_function(self.name.as_ref()));
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let c = shared::name_to_descriptor(name.as_ref()) as u32;
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(my_quote! {
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impl ::wasm_bindgen::convert::WasmBoundary for #name {
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type Abi = u32;
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const DESCRIPTOR: u32 = #c;
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fn into_abi(self) -> u32 {
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Box::into_raw(Box::new(::wasm_bindgen::__rt::WasmRefCell::new(self))) as u32
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}
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unsafe fn from_abi(js: u32) -> Self {
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let js = js as *mut ::wasm_bindgen::__rt::WasmRefCell<#name>;
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::wasm_bindgen::__rt::assert_not_null(js);
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let js = Box::from_raw(js);
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js.borrow_mut(); // make sure no one's borrowing
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js.into_inner()
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}
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}
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impl ::wasm_bindgen::convert::FromRefWasmBoundary for #name {
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type RefAnchor = ::wasm_bindgen::__rt::Ref<'static, #name>;
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unsafe fn from_abi_ref(js: Self::Abi) -> Self::RefAnchor {
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let js = js as *mut ::wasm_bindgen::__rt::WasmRefCell<#name>;
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::wasm_bindgen::__rt::assert_not_null(js);
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(*js).borrow()
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}
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}
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impl ::wasm_bindgen::convert::FromRefMutWasmBoundary for #name {
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type RefAnchor = ::wasm_bindgen::__rt::RefMut<'static, #name>;
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unsafe fn from_abi_ref_mut(js: Self::Abi) -> Self::RefAnchor {
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let js = js as *mut ::wasm_bindgen::__rt::WasmRefCell<#name>;
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::wasm_bindgen::__rt::assert_not_null(js);
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(*js).borrow_mut()
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}
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}
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#[no_mangle]
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pub unsafe extern fn #free_fn(ptr: u32) {
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<#name as ::wasm_bindgen::convert::WasmBoundary>::from_abi(ptr);
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}
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}).to_tokens(tokens);
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}
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}
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impl ToTokens for ast::Export {
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fn to_tokens(self: &ast::Export, into: &mut Tokens) {
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let generated_name = self.rust_symbol();
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let export_name = self.export_name();
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let mut args = vec![];
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let mut arg_conversions = vec![];
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let mut converted_arguments = vec![];
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let ret = syn::Ident::from("_ret");
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let mut offset = 0;
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if self.method {
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let class = self.class.unwrap();
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args.push(my_quote! { me: *mut ::wasm_bindgen::__rt::WasmRefCell<#class> });
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arg_conversions.push(my_quote! {
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::wasm_bindgen::__rt::assert_not_null(me);
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let me = unsafe { &*me };
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});
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offset = 1;
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}
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for (i, ty) in self.function.arguments.iter().enumerate() {
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let i = i + offset;
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let ident = syn::Ident::from(format!("arg{}", i));
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match *ty {
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// ast::Type::Vector(ref ty, owned) => {
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// let ptr = syn::Ident::from(format!("arg{}_ptr", i));
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// let len = syn::Ident::from(format!("arg{}_len", i));
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// let abi_ty = ty.abi_element();
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// args.push(my_quote! { #ptr: *mut #abi_ty });
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// args.push(my_quote! { #len: usize });
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// if owned {
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// arg_conversions.push(my_quote! {
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// let #ident = unsafe {
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// ::std::vec::Vec::from_raw_parts(#ptr, #len, #len)
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// };
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// });
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// } else {
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// arg_conversions.push(my_quote! {
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// let #ident = unsafe {
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// ::std::slice::from_raw_parts(#ptr as *const #abi_ty, #len)
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// };
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// });
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// }
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// if let ast::VectorType::String = *ty {
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// if owned {
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// arg_conversions.push(my_quote! {
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// let #ident = unsafe {
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// ::std::string::String::from_utf8_unchecked(#ident)
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// };
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// });
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// } else {
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// arg_conversions.push(my_quote! {
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// let #ident = unsafe {
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// ::std::str::from_utf8_unchecked(#ident)
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// };
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// });
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// }
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// }
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// }
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ast::Type::ByValue(ref t) => {
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args.push(my_quote! {
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#ident: <#t as ::wasm_bindgen::convert::WasmBoundary>::Abi
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});
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arg_conversions.push(my_quote! {
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let #ident = unsafe {
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<#t as ::wasm_bindgen::convert::WasmBoundary>
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::from_abi(#ident, &mut __stack)
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};
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});
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}
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ast::Type::ByRef(ref ty) => {
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args.push(my_quote! {
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#ident: <#ty as ::wasm_bindgen::convert::FromRefWasmBoundary>::Abi
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});
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arg_conversions.push(my_quote! {
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let #ident = unsafe {
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<#ty as ::wasm_bindgen::convert::FromRefWasmBoundary>
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::from_abi_ref(#ident, &mut __stack)
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};
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let #ident = &*#ident;
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});
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}
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ast::Type::ByMutRef(ref ty) => {
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args.push(my_quote! {
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#ident: <#ty as ::wasm_bindgen::convert::FromRefutWasmBoundary>::Abi
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});
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arg_conversions.push(my_quote! {
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let mut #ident = unsafe {
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<#ty as ::wasm_bindgen::convert::FromRefMutWasmBoundary>
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::from_abi_ref_mut(#ident, &mut __stack)
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};
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let #ident = &mut *#ident;
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});
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}
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}
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converted_arguments.push(my_quote! { #ident });
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}
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let ret_ty;
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let convert_ret;
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match self.function.ret {
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// Some(ast::Type::Vector(ref ty, true)) => {
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// ret_ty = my_quote! { -> *mut #ty };
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// convert_ret = my_quote! { Box::into_raw(Box::new(#ret)) };
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// }
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Some(ast::Type::ByValue(ref t)) => {
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ret_ty = my_quote! {
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-> <#t as ::wasm_bindgen::convert::WasmBoundary>::Abi
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};
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convert_ret = my_quote! {
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<#t as ::wasm_bindgen::convert::WasmBoundary>
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::into_abi(#ret, &mut unsafe {
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::wasm_bindgen::convert::GlobalStack::new()
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})
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};
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}
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Some(ast::Type::ByMutRef(_))
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| Some(ast::Type::ByRef(_)) => {
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panic!("can't return a borrowed ref");
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}
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None => {
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ret_ty = my_quote!{};
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convert_ret = my_quote!{};
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}
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}
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let name = self.function.name;
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let receiver = match self.class {
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Some(_) if self.method => {
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if self.mutable {
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my_quote! { me.borrow_mut().#name }
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} else {
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my_quote! { me.borrow().#name }
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}
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}
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Some(class) => my_quote! { #class::#name },
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None => my_quote!{ #name },
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};
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let tokens = my_quote! {
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#[export_name = #export_name]
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#[allow(non_snake_case)]
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pub extern fn #generated_name(#(#args),*) #ret_ty {
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::wasm_bindgen::__rt::link_this_library();
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let mut __stack = unsafe {
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::wasm_bindgen::convert::GlobalStack::new()
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};
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#(#arg_conversions)*
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let #ret = #receiver(#(#converted_arguments),*);
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#convert_ret
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}
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};
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tokens.to_tokens(into);
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}
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}
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impl ToTokens for ast::ImportType {
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fn to_tokens(&self, tokens: &mut Tokens) {
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let vis = &self.vis;
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let name = &self.name;
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(my_quote! {
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#[allow(bad_style)]
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#vis struct #name {
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obj: ::wasm_bindgen::JsValue,
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}
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impl ::wasm_bindgen::convert::WasmBoundary for #name {
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type Abi = <::wasm_bindgen::JsValue as
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::wasm_bindgen::convert::WasmBoundary>::Abi;
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const DESCRIPTOR: u32 = <::wasm_bindgen::JsValue as
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::wasm_bindgen::convert::WasmBoundary>::DESCRIPTOR;
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fn into_abi(self) -> Self::Abi {
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self.obj.into_abi()
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}
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unsafe fn from_abi(js: Self::Abi) -> Self {
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#name { obj: ::wasm_bindgen::JsValue::from_abi(js) }
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}
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}
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impl ::wasm_bindgen::convert::ToRefWasmBoundary for #name {
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fn to_abi_ref(&self) -> u32 {
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self.obj.to_abi_ref()
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}
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}
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impl ::wasm_bindgen::convert::FromRefWasmBoundary for #name {
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type RefAnchor = ::std::mem::ManuallyDrop<#name>;
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unsafe fn from_abi_ref(js: Self::Abi) -> Self::RefAnchor {
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let obj = <::wasm_bindgen::JsValue as ::wasm_bindgen::convert::WasmBoundary>
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::from_abi(js);
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::std::mem::ManuallyDrop::new(#name { obj })
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}
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}
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impl From<::wasm_bindgen::JsValue> for #name {
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fn from(obj: ::wasm_bindgen::JsValue) -> #name {
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#name { obj }
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}
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}
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impl From<#name> for ::wasm_bindgen::JsValue {
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fn from(obj: #name) -> ::wasm_bindgen::JsValue {
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obj.obj
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}
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}
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}).to_tokens(tokens);
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}
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}
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impl ToTokens for ast::ImportKind {
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fn to_tokens(&self, tokens: &mut Tokens) {
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match *self {
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ast::ImportKind::Function(ref f) => f.to_tokens(tokens),
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ast::ImportKind::Static(ref s) => s.to_tokens(tokens),
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ast::ImportKind::Type(ref t) => t.to_tokens(tokens),
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}
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}
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}
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impl ToTokens for ast::ImportFunction {
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fn to_tokens(&self, tokens: &mut Tokens) {
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let mut class_ty = None;
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let mut is_method = false;
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match self.kind {
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ast::ImportFunctionKind::Method { ref ty, .. } => {
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is_method = true;
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class_ty = Some(ty);
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}
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ast::ImportFunctionKind::JsConstructor { ref ty, .. } => {
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class_ty = Some(ty);
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}
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ast::ImportFunctionKind::Normal => {}
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}
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let vis = &self.function.rust_vis;
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let ret = &self.function.rust_decl.output;
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let fn_token = &self.function.rust_decl.fn_token;
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let mut abi_argument_names = Vec::new();
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let mut abi_arguments = Vec::new();
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let mut arg_conversions = Vec::new();
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let ret_ident = syn::Ident::from("_ret");
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let names = self.function
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.rust_decl
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.inputs
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.iter()
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.map(|arg| match *arg {
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syn::FnArg::Captured(ref c) => c,
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_ => panic!("arguments cannot be `self` or ignored"),
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})
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.map(|arg| match arg.pat {
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syn::Pat::Ident(syn::PatIdent {
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by_ref: None,
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ident,
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subpat: None,
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..
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}) => ident,
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_ => panic!("unsupported pattern in foreign function"),
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});
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for (i, (ty, name)) in self.function.arguments.iter().zip(names).enumerate() {
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match *ty {
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// ast::Type::Vector(ref ty, owned) => {
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// let ptr = syn::Ident::from(format!("{}_ptr", name));
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// let len = syn::Ident::from(format!("{}_len", name));
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// abi_argument_names.push(ptr);
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// abi_argument_names.push(len);
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// let abi_ty = ty.abi_element();
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// abi_arguments.push(my_quote! { #ptr: *const #abi_ty });
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// abi_arguments.push(my_quote! { #len: usize });
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// arg_conversions.push(my_quote! {
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// let #ptr = #name.as_ptr();
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// let #len = #name.len();
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// });
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// if owned {
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// arg_conversions.push(my_quote! { ::std::mem::forget(#name); });
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// }
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// }
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ast::Type::ByValue(ref t) => {
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abi_argument_names.push(name);
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abi_arguments.push(my_quote! {
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#name: <#t as ::wasm_bindgen::convert::WasmBoundary>::Abi
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});
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if i == 0 && is_method {
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arg_conversions.push(my_quote! {
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let #name = <#t as ::wasm_bindgen::convert::WasmBoundary>
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::into_abi(self);
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});
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} else {
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arg_conversions.push(my_quote! {
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let #name = <#t as ::wasm_bindgen::convert::WasmBoundary>
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::into_abi(#name);
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});
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}
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}
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ast::Type::ByMutRef(_) => panic!("urgh mut"),
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ast::Type::ByRef(ref t) => {
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abi_argument_names.push(name);
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abi_arguments.push(my_quote! { #name: u32 });
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if i == 0 && is_method {
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arg_conversions.push(my_quote! {
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let #name = <#t as ::wasm_bindgen::convert::ToRefWasmBoundary>
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::to_abi_ref(self);
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});
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} else {
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arg_conversions.push(my_quote! {
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let #name = <#t as ::wasm_bindgen::convert::ToRefWasmBoundary>
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::to_abi_ref(#name);
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});
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}
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}
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}
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}
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let abi_ret;
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let mut convert_ret;
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match self.function.ret {
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Some(ast::Type::ByValue(ref t)) => {
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abi_ret = my_quote! {
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<#t as ::wasm_bindgen::convert::WasmBoundary>::Abi
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};
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convert_ret = my_quote! {
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<#t as ::wasm_bindgen::convert::WasmBoundary>::from_abi(#ret_ident)
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};
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}
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|
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// Some(ast::Type::Vector(ref ty, true)) => {
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|
// let name = syn::Ident::from("__ret_len");
|
|
// let name_ptr = syn::Ident::from("__ret_len_ptr");
|
|
// abi_argument_names.push(name_ptr);
|
|
// abi_arguments.push(my_quote! { #name_ptr: *mut usize });
|
|
// arg_conversions.push(my_quote! {
|
|
// let mut #name = 0;
|
|
// let mut #name_ptr = &mut #name as *mut usize;
|
|
// });
|
|
// let abi_ty = ty.abi_element();
|
|
// abi_ret = my_quote! { *mut #abi_ty };
|
|
// if let ast::VectorType::String = *ty {
|
|
// convert_ret = my_quote! {
|
|
// String::from_utf8_unchecked(
|
|
// Vec::from_raw_parts(#ret_ident, #name, #name)
|
|
// )
|
|
// };
|
|
// } else {
|
|
// convert_ret = my_quote! {
|
|
// Vec::from_raw_parts(#ret_ident, #name, #name)
|
|
// };
|
|
// }
|
|
// }
|
|
Some(ast::Type::ByRef(_))
|
|
| Some(ast::Type::ByMutRef(_)) => panic!("can't return a borrowed ref"),
|
|
None => {
|
|
abi_ret = my_quote! { () };
|
|
convert_ret = my_quote! { () };
|
|
}
|
|
}
|
|
|
|
let mut exceptional_ret = my_quote!{};
|
|
if self.function.opts.catch() {
|
|
let exn_data = syn::Ident::from("exn_data");
|
|
let exn_data_ptr = syn::Ident::from("exn_data_ptr");
|
|
abi_argument_names.push(exn_data_ptr);
|
|
abi_arguments.push(my_quote! { #exn_data_ptr: *mut u32 });
|
|
arg_conversions.push(my_quote! {
|
|
let mut #exn_data = [0; 2];
|
|
let #exn_data_ptr = #exn_data.as_mut_ptr();
|
|
});
|
|
convert_ret = my_quote! { Ok(#convert_ret) };
|
|
exceptional_ret = my_quote! {
|
|
if #exn_data[0] == 1 {
|
|
return Err(<::wasm_bindgen::JsValue as
|
|
::wasm_bindgen::convert::WasmBoundary>::from_abi(#exn_data[1]))
|
|
}
|
|
};
|
|
}
|
|
|
|
let rust_name = self.rust_name;
|
|
let import_name = self.shim;
|
|
let attrs = &self.function.rust_attrs;
|
|
|
|
let arguments = self.function
|
|
.rust_decl
|
|
.inputs
|
|
.iter()
|
|
.skip(if is_method { 1 } else { 0 })
|
|
.collect::<Vec<_>>();
|
|
|
|
let me = if is_method {
|
|
my_quote! { &self, }
|
|
} else {
|
|
quote!()
|
|
};
|
|
|
|
let invocation = my_quote! {
|
|
#(#attrs)*
|
|
#[allow(bad_style)]
|
|
#vis extern #fn_token #rust_name(#me #(#arguments),*) #ret {
|
|
::wasm_bindgen::__rt::link_this_library();
|
|
#[wasm_import_module = "__wbindgen_placeholder__"]
|
|
extern {
|
|
fn #import_name(#(#abi_arguments),*) -> #abi_ret;
|
|
}
|
|
unsafe {
|
|
#(#arg_conversions)*
|
|
let #ret_ident = #import_name(#(#abi_argument_names),*);
|
|
#exceptional_ret
|
|
#convert_ret
|
|
}
|
|
}
|
|
};
|
|
|
|
if let Some(class) = class_ty {
|
|
(quote! {
|
|
impl #class {
|
|
#invocation
|
|
}
|
|
}).to_tokens(tokens);
|
|
} else {
|
|
invocation.to_tokens(tokens);
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ToTokens for ast::Enum {
|
|
fn to_tokens(&self, into: &mut Tokens) {
|
|
let enum_name = &self.name;
|
|
let c = shared::TYPE_ENUM as u32;
|
|
let incoming_u32 = quote! { n };
|
|
let enum_name_as_string = enum_name.to_string();
|
|
let cast_clauses = self.variants.iter().map(|variant| {
|
|
let variant_name = &variant.name;
|
|
quote! {
|
|
if #incoming_u32 == #enum_name::#variant_name as u32 {
|
|
#enum_name::#variant_name
|
|
}
|
|
}
|
|
});
|
|
(my_quote! {
|
|
impl #enum_name {
|
|
fn from_u32(#incoming_u32: u32) -> #enum_name {
|
|
#(#cast_clauses else)* {
|
|
wasm_bindgen::throw(&format!("Could not cast {} as {}", #incoming_u32, #enum_name_as_string));
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ::wasm_bindgen::convert::WasmBoundary for #enum_name {
|
|
type Abi = u32;
|
|
const DESCRIPTOR: u32 = #c;
|
|
|
|
fn into_abi(self) -> u32 {
|
|
self as u32
|
|
}
|
|
|
|
unsafe fn from_abi(js: u32) -> Self {
|
|
#enum_name::from_u32(js)
|
|
}
|
|
}
|
|
}).to_tokens(into);
|
|
}
|
|
}
|
|
|
|
impl ToTokens for ast::ImportStatic {
|
|
fn to_tokens(&self, into: &mut Tokens) {
|
|
let name = self.rust_name;
|
|
let ty = &self.ty;
|
|
let shim_name = self.shim;
|
|
let vis = &self.vis;
|
|
(my_quote! {
|
|
#[allow(bad_style)]
|
|
#vis static #name: ::wasm_bindgen::JsStatic<#ty> = {
|
|
fn init() -> #ty {
|
|
#[wasm_import_module = "__wbindgen_placeholder__"]
|
|
extern {
|
|
fn #shim_name() -> u32;
|
|
}
|
|
unsafe {
|
|
::wasm_bindgen::convert::WasmBoundary::from_abi(#shim_name())
|
|
}
|
|
}
|
|
::wasm_bindgen::JsStatic {
|
|
__inner: ::std::cell::UnsafeCell::new(None),
|
|
__init: init,
|
|
}
|
|
};
|
|
}).to_tokens(into);
|
|
}
|
|
}
|