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Remove HostRef<T> from the C API (#1926)

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This commit removes `HostRef<T>` from the C API which only served the
purpose now of converting each type to a `wasm_ref_t*`. Our
implementation, however, does not guarantee that you'll get the same
`wasm_ref_t*` for each actual underlying item (e.g. if you put a func in
a table and then get the func as an export and from the table then
`same` will report `false`). Additionally the fate of `wasm_ref_t*`
seems somewhat unclear at this point.

The change here is to make the `same` and cast functions all abort
saying they're unimplemented. (similar to the host info functions). If
and when we get around to reimplementing these functions we can ensure
they're implemented uniformly and work well for all intended use cases.
This commit is contained in:
Alex Crichton
2020-06-26 14:34:34 -05:00
committed by GitHub
parent c3799c8ab4
commit cca558cd20
14 changed files with 113 additions and 332 deletions
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25
crates/c-api/src/global.rs
View File

@@ -1,8 +1,7 @@
use crate::host_ref::HostRef;
use crate::{handle_result, wasmtime_error_t};
use crate::{wasm_extern_t, wasm_globaltype_t, wasm_store_t, wasm_val_t, ExternHost};
use crate::{wasm_extern_t, wasm_globaltype_t, wasm_store_t, wasm_val_t};
use std::ptr;
use wasmtime::Global;
use wasmtime::{Extern, Global};
#[derive(Clone)]
#[repr(transparent)]
@@ -15,21 +14,17 @@ wasmtime_c_api_macros::declare_ref!(wasm_global_t);
impl wasm_global_t {
pub(crate) fn try_from(e: &wasm_extern_t) -> Option<&wasm_global_t> {
match &e.which {
ExternHost::Global(_) => Some(unsafe { &*(e as *const _ as *const _) }),
Extern::Global(_) => Some(unsafe { &*(e as *const _ as *const _) }),
_ => None,
}
}
fn global(&self) -> &HostRef<Global> {
fn global(&self) -> &Global {
match &self.ext.which {
ExternHost::Global(g) => g,
Extern::Global(g) => g,
_ => unsafe { std::hint::unreachable_unchecked() },
}
}
fn externref(&self) -> wasmtime::ExternRef {
self.global().clone().into()
}
}
#[no_mangle]
@@ -59,7 +54,7 @@ pub extern "C" fn wasmtime_global_new(
handle_result(global, |global| {
*ret = Box::into_raw(Box::new(wasm_global_t {
ext: wasm_extern_t {
which: ExternHost::Global(HostRef::new(global)),
which: global.into(),
},
}));
})
@@ -72,18 +67,18 @@ pub extern "C" fn wasm_global_as_extern(g: &wasm_global_t) -> &wasm_extern_t {
#[no_mangle]
pub extern "C" fn wasm_global_type(g: &wasm_global_t) -> Box<wasm_globaltype_t> {
let globaltype = g.global().borrow().ty();
let globaltype = g.global().ty();
Box::new(wasm_globaltype_t::new(globaltype))
}
#[no_mangle]
pub extern "C" fn wasm_global_get(g: &wasm_global_t, out: &mut wasm_val_t) {
out.set(g.global().borrow().get());
out.set(g.global().get());
}
#[no_mangle]
pub extern "C" fn wasm_global_set(g: &wasm_global_t, val: &wasm_val_t) {
let result = g.global().borrow().set(val.val());
let result = g.global().set(val.val());
// FIXME(WebAssembly/wasm-c-api#131) should communicate the error here
drop(result);
}
@@ -93,5 +88,5 @@ pub extern "C" fn wasmtime_global_set(
g: &wasm_global_t,
val: &wasm_val_t,
) -> Option<Box<wasmtime_error_t>> {
handle_result(g.global().borrow().set(val.val()), |()| {})
handle_result(g.global().set(val.val()), |()| {})
}