wasmtime_c_api/
structref.rs

1use crate::{WasmtimeStoreContextMut, wasmtime_anyref_t, wasmtime_eqref_t, wasmtime_struct_type_t};
2use std::mem::MaybeUninit;
3use wasmtime::{OwnedRooted, RootScope, StructRef, StructRefPre, Val};
4
5crate::anyref::ref_wrapper!({
6    wasmtime: StructRef,
7    capi: wasmtime_structref_t,
8    clone: wasmtime_structref_clone,
9    unroot: wasmtime_structref_unroot,
10});
11
12pub struct wasmtime_struct_ref_pre_t {
13    pre: StructRefPre,
14}
15wasmtime_c_api_macros::declare_own!(wasmtime_struct_ref_pre_t);
16
17#[unsafe(no_mangle)]
18pub extern "C" fn wasmtime_struct_ref_pre_new(
19    cx: WasmtimeStoreContextMut<'_>,
20    ty: &wasmtime_struct_type_t,
21) -> Box<wasmtime_struct_ref_pre_t> {
22    let pre = StructRefPre::new(cx, ty.ty.clone());
23    Box::new(wasmtime_struct_ref_pre_t { pre })
24}
25
26#[unsafe(no_mangle)]
27pub unsafe extern "C" fn wasmtime_structref_new(
28    mut cx: WasmtimeStoreContextMut<'_>,
29    pre: &wasmtime_struct_ref_pre_t,
30    fields: *const crate::wasmtime_val_t,
31    nfields: usize,
32    out: &mut MaybeUninit<wasmtime_structref_t>,
33) -> Option<Box<crate::wasmtime_error_t>> {
34    let c_fields = crate::slice_from_raw_parts(fields, nfields);
35    let mut scope = RootScope::new(&mut cx);
36    let vals: Vec<Val> = c_fields.iter().map(|v| v.to_val(&mut scope)).collect();
37    match StructRef::new(&mut scope, &pre.pre, &vals) {
38        Ok(structref) => {
39            let owned = structref
40                .to_owned_rooted(&mut scope)
41                .expect("just allocated");
42            crate::initialize(out, Some(owned).into());
43            None
44        }
45        Err(e) => {
46            crate::initialize(out, None::<OwnedRooted<StructRef>>.into());
47            Some(Box::new(e.into()))
48        }
49    }
50}
51
52#[unsafe(no_mangle)]
53pub unsafe extern "C" fn wasmtime_structref_to_anyref(
54    structref: Option<&wasmtime_structref_t>,
55    out: &mut MaybeUninit<wasmtime_anyref_t>,
56) {
57    let anyref = structref
58        .and_then(|s| s.as_wasmtime())
59        .map(|s| s.to_anyref());
60    crate::initialize(out, anyref.into());
61}
62
63#[unsafe(no_mangle)]
64pub unsafe extern "C" fn wasmtime_structref_to_eqref(
65    structref: Option<&wasmtime_structref_t>,
66    out: &mut MaybeUninit<wasmtime_eqref_t>,
67) {
68    let eqref = structref
69        .and_then(|s| s.as_wasmtime())
70        .map(|s| s.to_eqref());
71    crate::initialize(out, eqref.into());
72}
73
74#[unsafe(no_mangle)]
75pub unsafe extern "C" fn wasmtime_structref_field(
76    mut cx: WasmtimeStoreContextMut<'_>,
77    structref: Option<&wasmtime_structref_t>,
78    index: usize,
79    out: &mut MaybeUninit<crate::wasmtime_val_t>,
80) -> Option<Box<crate::wasmtime_error_t>> {
81    let structref = structref
82        .and_then(|s| s.as_wasmtime())
83        .expect("non-null structref required");
84    let mut scope = RootScope::new(&mut cx);
85    let rooted = structref.to_rooted(&mut scope);
86    match rooted.field(&mut scope, index) {
87        Ok(val) => {
88            let c_val = crate::wasmtime_val_t::from_val(&mut scope, val);
89            crate::initialize(out, c_val);
90            None
91        }
92        Err(e) => Some(Box::new(e.into())),
93    }
94}
95
96#[unsafe(no_mangle)]
97pub unsafe extern "C" fn wasmtime_structref_set_field(
98    mut cx: WasmtimeStoreContextMut<'_>,
99    structref: Option<&wasmtime_structref_t>,
100    index: usize,
101    val: &crate::wasmtime_val_t,
102) -> Option<Box<crate::wasmtime_error_t>> {
103    let structref = structref
104        .and_then(|s| s.as_wasmtime())
105        .expect("non-null structref required");
106    let mut scope = RootScope::new(&mut cx);
107    let rooted = structref.to_rooted(&mut scope);
108    let rust_val = val.to_val(&mut scope);
109    match rooted.set_field(&mut scope, index, rust_val) {
110        Ok(()) => None,
111        Err(e) => Some(Box::new(e.into())),
112    }
113}
wasmtime_c_api/structref.rs

wasmtime_c_api/
structref.rs
