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wasmtime: Initial, partial support for externref

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This is enough to get an `externref -> externref` identity function
passing.

However, `externref`s that are dropped by compiled Wasm code are (safely)
leaked. Follow up work will leverage cranelift's stack maps to resolve this
issue.
This commit is contained in:
Nick Fitzgerald
2020-05-22 17:12:45 -07:00
parent 137e182750
commit a8ee0554a9
41 changed files with 545 additions and 376 deletions
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6
crates/c-api/src/global.rs
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@@ -27,7 +27,7 @@ impl wasm_global_t {
}
fn externref(&self) -> wasmtime::ExternRef {
self.global().externref()
self.global().clone().into()
}
}
@@ -54,11 +54,11 @@ pub extern "C" fn wasmtime_global_new(
val: &wasm_val_t,
ret: &mut *mut wasm_global_t,
) -> Option<Box<wasmtime_error_t>> {
let global = Global::new(&store.store.borrow(), gt.ty().ty.clone(), val.val());
let global = Global::new(&store.store, gt.ty().ty.clone(), val.val());
handle_result(global, |global| {
*ret = Box::into_raw(Box::new(wasm_global_t {
ext: wasm_extern_t {
which: ExternHost::Global(HostRef::new(global)),
which: ExternHost::Global(HostRef::new(&store.store, global)),
},
}));
})