94 lines
2.5 KiB
Rust
94 lines
2.5 KiB
Rust
use crate::{handle_result, wasmtime_error_t};
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use crate::{wasm_extern_t, wasm_globaltype_t, wasm_store_t, wasm_val_t};
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use std::mem::MaybeUninit;
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use std::ptr;
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use wasmtime::{Extern, Global};
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#[derive(Clone)]
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#[repr(transparent)]
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pub struct wasm_global_t {
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ext: wasm_extern_t,
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}
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wasmtime_c_api_macros::declare_ref!(wasm_global_t);
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impl wasm_global_t {
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pub(crate) fn try_from(e: &wasm_extern_t) -> Option<&wasm_global_t> {
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match &e.which {
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Extern::Global(_) => Some(unsafe { &*(e as *const _ as *const _) }),
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_ => None,
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}
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}
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fn global(&self) -> &Global {
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match &self.ext.which {
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Extern::Global(g) => g,
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_ => unsafe { std::hint::unreachable_unchecked() },
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}
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}
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}
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#[no_mangle]
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pub extern "C" fn wasm_global_new(
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store: &wasm_store_t,
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gt: &wasm_globaltype_t,
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val: &wasm_val_t,
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) -> Option<Box<wasm_global_t>> {
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let mut global = ptr::null_mut();
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match wasmtime_global_new(store, gt, val, &mut global) {
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Some(_err) => None,
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None => {
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assert!(!global.is_null());
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Some(unsafe { Box::from_raw(global) })
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}
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}
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}
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#[no_mangle]
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pub extern "C" fn wasmtime_global_new(
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store: &wasm_store_t,
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gt: &wasm_globaltype_t,
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val: &wasm_val_t,
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ret: &mut *mut wasm_global_t,
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) -> Option<Box<wasmtime_error_t>> {
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let global = Global::new(&store.store, gt.ty().ty.clone(), val.val());
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handle_result(global, |global| {
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*ret = Box::into_raw(Box::new(wasm_global_t {
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ext: wasm_extern_t {
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which: global.into(),
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},
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}));
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})
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}
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#[no_mangle]
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pub extern "C" fn wasm_global_as_extern(g: &wasm_global_t) -> &wasm_extern_t {
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&g.ext
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}
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#[no_mangle]
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pub extern "C" fn wasm_global_type(g: &wasm_global_t) -> Box<wasm_globaltype_t> {
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let globaltype = g.global().ty();
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Box::new(wasm_globaltype_t::new(globaltype))
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}
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#[no_mangle]
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pub extern "C" fn wasm_global_get(g: &wasm_global_t, out: &mut MaybeUninit<wasm_val_t>) {
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crate::initialize(out, wasm_val_t::from_val(g.global().get()));
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}
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#[no_mangle]
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pub extern "C" fn wasm_global_set(g: &wasm_global_t, val: &wasm_val_t) {
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let result = g.global().set(val.val());
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// FIXME(WebAssembly/wasm-c-api#131) should communicate the error here
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drop(result);
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}
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#[no_mangle]
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pub extern "C" fn wasmtime_global_set(
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g: &wasm_global_t,
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val: &wasm_val_t,
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) -> Option<Box<wasmtime_error_t>> {
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handle_result(g.global().set(val.val()), |()| {})
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}
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