wasmtime_c_api/
global.rs

1use crate::{
2    handle_result, wasm_extern_t, wasm_globaltype_t, wasm_store_t, wasm_val_t, wasmtime_error_t,
3    wasmtime_val_t, WasmtimeStoreContext, WasmtimeStoreContextMut,
4};
5use std::mem::MaybeUninit;
6use wasmtime::{Extern, Global, RootScope};
7
8#[derive(Clone)]
9#[repr(transparent)]
10pub struct wasm_global_t {
11    ext: wasm_extern_t,
12}
13
14wasmtime_c_api_macros::declare_ref!(wasm_global_t);
15
16impl wasm_global_t {
17    pub(crate) fn try_from(e: &wasm_extern_t) -> Option<&wasm_global_t> {
18        match &e.which {
19            Extern::Global(_) => Some(unsafe { &*(e as *const _ as *const _) }),
20            _ => None,
21        }
22    }
23
24    fn global(&self) -> Global {
25        match self.ext.which {
26            Extern::Global(g) => g,
27            _ => unsafe { std::hint::unreachable_unchecked() },
28        }
29    }
30}
31
32#[unsafe(no_mangle)]
33pub unsafe extern "C" fn wasm_global_new(
34    store: &mut wasm_store_t,
35    gt: &wasm_globaltype_t,
36    val: &wasm_val_t,
37) -> Option<Box<wasm_global_t>> {
38    match Global::new(store.store.context_mut(), gt.ty().ty.clone(), val.val()) {
39        Ok(global) => Some(Box::new(wasm_global_t {
40            ext: wasm_extern_t {
41                store: store.store.clone(),
42                which: global.into(),
43            },
44        })),
45        Err(_) => None,
46    }
47}
48
49#[unsafe(no_mangle)]
50pub extern "C" fn wasm_global_as_extern(g: &mut wasm_global_t) -> &mut wasm_extern_t {
51    &mut g.ext
52}
53
54#[unsafe(no_mangle)]
55pub extern "C" fn wasm_global_as_extern_const(g: &wasm_global_t) -> &wasm_extern_t {
56    &g.ext
57}
58
59#[unsafe(no_mangle)]
60pub unsafe extern "C" fn wasm_global_type(g: &wasm_global_t) -> Box<wasm_globaltype_t> {
61    let globaltype = g.global().ty(&g.ext.store.context());
62    Box::new(wasm_globaltype_t::new(globaltype))
63}
64
65#[unsafe(no_mangle)]
66pub unsafe extern "C" fn wasm_global_get(g: &mut wasm_global_t, out: &mut MaybeUninit<wasm_val_t>) {
67    let global = g.global();
68    crate::initialize(
69        out,
70        wasm_val_t::from_val(global.get(g.ext.store.context_mut())),
71    );
72}
73
74#[unsafe(no_mangle)]
75pub unsafe extern "C" fn wasm_global_set(g: &mut wasm_global_t, val: &wasm_val_t) {
76    let global = g.global();
77    drop(global.set(g.ext.store.context_mut(), val.val()));
78}
79
80#[unsafe(no_mangle)]
81pub unsafe extern "C" fn wasmtime_global_new(
82    mut store: WasmtimeStoreContextMut<'_>,
83    gt: &wasm_globaltype_t,
84    val: &wasmtime_val_t,
85    ret: &mut Global,
86) -> Option<Box<wasmtime_error_t>> {
87    let mut scope = RootScope::new(&mut store);
88    let val = val.to_val(&mut scope);
89    let global = Global::new(scope, gt.ty().ty.clone(), val);
90    handle_result(global, |global| {
91        *ret = global;
92    })
93}
94
95#[unsafe(no_mangle)]
96pub extern "C" fn wasmtime_global_type(
97    store: WasmtimeStoreContext<'_>,
98    global: &Global,
99) -> Box<wasm_globaltype_t> {
100    Box::new(wasm_globaltype_t::new(global.ty(store)))
101}
102
103#[unsafe(no_mangle)]
104pub extern "C" fn wasmtime_global_get(
105    store: WasmtimeStoreContextMut<'_>,
106    global: &Global,
107    val: &mut MaybeUninit<wasmtime_val_t>,
108) {
109    let mut scope = RootScope::new(store);
110    let gval = global.get(&mut scope);
111    crate::initialize(val, wasmtime_val_t::from_val(&mut scope, gval))
112}
113
114#[unsafe(no_mangle)]
115pub unsafe extern "C" fn wasmtime_global_set(
116    mut store: WasmtimeStoreContextMut<'_>,
117    global: &Global,
118    val: &wasmtime_val_t,
119) -> Option<Box<wasmtime_error_t>> {
120    let mut scope = RootScope::new(&mut store);
121    let val = val.to_val(&mut scope);
122    handle_result(global.set(scope, val), |()| {})
123}
wasmtime_c_api/global.rs

wasmtime_c_api/
global.rs
