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Leverage new rustc wasm features

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This commit leverages two new attributes in the Rust compiler,
`#[wasm_custom_section]` and `#[wasm_import_module]`. These two attributes allow
removing a lot of hacks found in wasm-bindgen and also allows removing the
requirement of `wasm-opt` to remove the unused data sections.

This does require two new nightly features but we already required the
`proc_macro` nightly feature and these will hopefully be stabilized before that
feature!
This commit is contained in:
Alex Crichton
2018-03-14 14:33:53 -07:00
parent dc03e6c84a
commit 02b7021053
26 changed files with 110 additions and 170 deletions
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7
src/lib.rs
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@ -5,7 +5,7 @@
//! this crate and this crate also provides JS bindings through the `JsValue`
//! interface.
#![feature(use_extern_macros, try_reserve)]
#![feature(use_extern_macros, wasm_import_module, try_reserve)]
extern crate wasm_bindgen_macro;
@ -213,6 +213,7 @@ macro_rules! numbers {
numbers! { i8 u8 i16 u16 i32 u32 f32 f64 }
#[wasm_import_module = "__wbindgen_placeholder__"]
extern {
fn __wbindgen_object_clone_ref(idx: u32) -> u32;
fn __wbindgen_object_drop_ref(idx: u32);
@ -228,6 +229,7 @@ extern {
fn __wbindgen_symbol_new(ptr: *const u8, len: usize) -> u32;
fn __wbindgen_is_symbol(idx: u32) -> u32;
fn __wbindgen_string_get(idx: u32, len: *mut usize) -> *mut u8;
fn __wbindgen_throw(a: *const u8, b: usize) -> !;
}
impl Clone for JsValue {
@ -298,9 +300,6 @@ impl<T: WasmBoundary> Deref for JsStatic<T> {
#[cold]
#[inline(never)]
pub fn throw(s: &str) -> ! {
extern {
fn __wbindgen_throw(a: *const u8, b: usize) -> !;
}
unsafe {
__wbindgen_throw(s.as_ptr(), s.len());
}