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Work with #![no_std] contexts

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This commit adds support for both `#![no_std]` in the wasm-bindgen runtime
support (disabled by default with an on-by-default `std` feature). This also
adds support to work and compile in the context of `#![no_std]` crates.

Closes #146
This commit is contained in:
Alex Crichton
2018-04-19 13:08:54 -07:00
parent 792a8e132e
commit 748184ae66
11 changed files with 318 additions and 127 deletions
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88
crates/backend/src/codegen.rs
View File

@ -116,13 +116,22 @@ impl ToTokens for ast::Struct {
}
}
::wasm_bindgen::__wbindgen_if_not_std! {
compile_error! {
"exporting a class to JS requires the `std` feature to \
be enabled in the `wasm-bindgen` crate"
}
}
impl ::wasm_bindgen::convert::IntoWasmAbi for #name {
type Abi = u32;
fn into_abi(self, _extra: &mut ::wasm_bindgen::convert::Stack)
-> u32
{
Box::into_raw(Box::new(::wasm_bindgen::__rt::WasmRefCell::new(self))) as u32
use wasm_bindgen::__rt::std::boxed::Box;
use wasm_bindgen::__rt::WasmRefCell;
Box::into_raw(Box::new(WasmRefCell::new(self))) as u32
}
}
@ -132,14 +141,49 @@ impl ToTokens for ast::Struct {
unsafe fn from_abi(js: u32, _extra: &mut ::wasm_bindgen::convert::Stack)
-> Self
{
let ptr = js as *mut ::wasm_bindgen::__rt::WasmRefCell<#name>;
::wasm_bindgen::__rt::assert_not_null(ptr);
use wasm_bindgen::__rt::std::boxed::Box;
use wasm_bindgen::__rt::{assert_not_null, WasmRefCell};
let ptr = js as *mut WasmRefCell<#name>;
assert_not_null(ptr);
let js = Box::from_raw(ptr);
js.borrow_mut(); // make sure no one's borrowing
js.into_inner()
}
}
impl ::wasm_bindgen::__rt::core::convert::From<#name> for
::wasm_bindgen::JsValue
{
fn from(value: #name) -> Self {
let ptr = ::wasm_bindgen::convert::IntoWasmAbi::into_abi(
value,
unsafe { &mut ::wasm_bindgen::convert::GlobalStack::new() },
);
#[wasm_import_module = "__wbindgen_placeholder__"]
extern {
fn #new_fn(ptr: u32) -> u32;
}
unsafe {
<::wasm_bindgen::JsValue as ::wasm_bindgen::convert::FromWasmAbi>
::from_abi(
#new_fn(ptr),
&mut ::wasm_bindgen::convert::GlobalStack::new(),
)
}
}
}
#[no_mangle]
pub unsafe extern fn #free_fn(ptr: u32) {
<#name as ::wasm_bindgen::convert::FromWasmAbi>::from_abi(
ptr,
&mut ::wasm_bindgen::convert::GlobalStack::new(),
);
}
impl ::wasm_bindgen::convert::RefFromWasmAbi for #name {
type Abi = u32;
type Anchor = ::wasm_bindgen::__rt::Ref<'static, #name>;
@ -167,36 +211,6 @@ impl ToTokens for ast::Struct {
(*js).borrow_mut()
}
}
impl ::std::convert::From<#name> for ::wasm_bindgen::JsValue {
fn from(value: #name) -> Self {
let ptr = ::wasm_bindgen::convert::IntoWasmAbi::into_abi(
value,
unsafe { &mut ::wasm_bindgen::convert::GlobalStack::new() },
);
#[wasm_import_module = "__wbindgen_placeholder__"]
extern {
fn #new_fn(ptr: u32) -> u32;
}
unsafe {
<::wasm_bindgen::JsValue as ::wasm_bindgen::convert::FromWasmAbi>
::from_abi(
#new_fn(ptr),
&mut ::wasm_bindgen::convert::GlobalStack::new(),
)
}
}
}
#[no_mangle]
pub unsafe extern fn #free_fn(ptr: u32) {
<#name as ::wasm_bindgen::convert::FromWasmAbi>::from_abi(
ptr,
&mut ::wasm_bindgen::convert::GlobalStack::new(),
);
}
}).to_tokens(tokens);
}
}
@ -419,7 +433,7 @@ impl ToTokens for ast::ImportType {
impl ::wasm_bindgen::convert::RefFromWasmAbi for #name {
type Abi = <::wasm_bindgen::JsValue as
::wasm_bindgen::convert::RefFromWasmAbi>::Abi;
type Anchor = ::std::mem::ManuallyDrop<#name>;
type Anchor = ::wasm_bindgen::__rt::core::mem::ManuallyDrop<#name>;
unsafe fn ref_from_abi(
js: Self::Abi,
@ -427,8 +441,8 @@ impl ToTokens for ast::ImportType {
) -> Self::Anchor {
let tmp = <::wasm_bindgen::JsValue as ::wasm_bindgen::convert::RefFromWasmAbi>
::ref_from_abi(js, extra);
::std::mem::ManuallyDrop::new(#name {
obj: ::std::mem::ManuallyDrop::into_inner(tmp),
::wasm_bindgen::__rt::core::mem::ManuallyDrop::new(#name {
obj: ::wasm_bindgen::__rt::core::mem::ManuallyDrop::into_inner(tmp),
})
}
}
@ -702,7 +716,7 @@ impl ToTokens for ast::ImportStatic {
}
}
::wasm_bindgen::JsStatic {
__inner: ::std::cell::UnsafeCell::new(None),
__inner: ::wasm_bindgen::__rt::core::cell::UnsafeCell::new(None),
__init: init,
}
};