wasmtime_c_api/
table.rs

1use crate::{
2    handle_result, wasm_extern_t, wasm_ref_t, wasm_store_t, wasm_tabletype_t, wasmtime_error_t,
3    wasmtime_val_t, WasmtimeStoreContext, WasmtimeStoreContextMut,
4};
5use anyhow::anyhow;
6use std::mem::MaybeUninit;
7use wasmtime::{Extern, Ref, RootScope, Table, TableType};
8
9#[derive(Clone)]
10#[repr(transparent)]
11pub struct wasm_table_t {
12    ext: wasm_extern_t,
13}
14
15wasmtime_c_api_macros::declare_ref!(wasm_table_t);
16
17pub type wasm_table_size_t = u32;
18
19impl wasm_table_t {
20    pub(crate) fn try_from(e: &wasm_extern_t) -> Option<&wasm_table_t> {
21        match &e.which {
22            Extern::Table(_) => Some(unsafe { &*(e as *const _ as *const _) }),
23            _ => None,
24        }
25    }
26
27    fn table(&self) -> Table {
28        match self.ext.which {
29            Extern::Table(t) => t,
30            _ => unsafe { std::hint::unreachable_unchecked() },
31        }
32    }
33}
34
35fn option_wasm_ref_t_to_ref(r: Option<&wasm_ref_t>, table_ty: &TableType) -> Ref {
36    r.map(|r| r.r.clone())
37        .unwrap_or_else(|| Ref::null(table_ty.element().heap_type()))
38}
39
40#[no_mangle]
41pub unsafe extern "C" fn wasm_table_new(
42    store: &mut wasm_store_t,
43    tt: &wasm_tabletype_t,
44    init: Option<&wasm_ref_t>,
45) -> Option<Box<wasm_table_t>> {
46    let tt = tt.ty().ty.clone();
47    let init = option_wasm_ref_t_to_ref(init, &tt);
48    let table = Table::new(store.store.context_mut(), tt, init).ok()?;
49    Some(Box::new(wasm_table_t {
50        ext: wasm_extern_t {
51            store: store.store.clone(),
52            which: table.into(),
53        },
54    }))
55}
56
57#[no_mangle]
58pub unsafe extern "C" fn wasm_table_type(t: &wasm_table_t) -> Box<wasm_tabletype_t> {
59    let table = t.table();
60    let store = t.ext.store.context();
61    Box::new(wasm_tabletype_t::new(table.ty(&store)))
62}
63
64#[no_mangle]
65pub unsafe extern "C" fn wasm_table_get(
66    t: &mut wasm_table_t,
67    index: wasm_table_size_t,
68) -> Option<Box<wasm_ref_t>> {
69    let table = t.table();
70    let r = table.get(t.ext.store.context_mut(), index)?;
71    wasm_ref_t::new(r)
72}
73
74#[no_mangle]
75pub unsafe extern "C" fn wasm_table_set(
76    t: &mut wasm_table_t,
77    index: wasm_table_size_t,
78    r: Option<&wasm_ref_t>,
79) -> bool {
80    let table = t.table();
81    let val = option_wasm_ref_t_to_ref(r, &table.ty(t.ext.store.context()));
82    table.set(t.ext.store.context_mut(), index, val).is_ok()
83}
84
85#[no_mangle]
86pub unsafe extern "C" fn wasm_table_size(t: &wasm_table_t) -> wasm_table_size_t {
87    let table = t.table();
88    let store = t.ext.store.context();
89    table.size(&store)
90}
91
92#[no_mangle]
93pub unsafe extern "C" fn wasm_table_grow(
94    t: &mut wasm_table_t,
95    delta: wasm_table_size_t,
96    init: Option<&wasm_ref_t>,
97) -> bool {
98    let table = t.table();
99    let init = option_wasm_ref_t_to_ref(init, &table.ty(t.ext.store.context()));
100    table.grow(t.ext.store.context_mut(), delta, init).is_ok()
101}
102
103#[no_mangle]
104pub extern "C" fn wasm_table_as_extern(t: &mut wasm_table_t) -> &mut wasm_extern_t {
105    &mut t.ext
106}
107
108#[no_mangle]
109pub extern "C" fn wasm_table_as_extern_const(t: &wasm_table_t) -> &wasm_extern_t {
110    &t.ext
111}
112
113#[no_mangle]
114pub unsafe extern "C" fn wasmtime_table_new(
115    mut store: WasmtimeStoreContextMut<'_>,
116    tt: &wasm_tabletype_t,
117    init: &wasmtime_val_t,
118    out: &mut Table,
119) -> Option<Box<wasmtime_error_t>> {
120    let mut scope = RootScope::new(&mut store);
121    handle_result(
122        init.to_val(&mut scope)
123            .ref_()
124            .ok_or_else(|| anyhow!("wasmtime_table_new init value is not a reference"))
125            .and_then(|init| Table::new(scope, tt.ty().ty.clone(), init)),
126        |table| *out = table,
127    )
128}
129
130#[no_mangle]
131pub unsafe extern "C" fn wasmtime_table_type(
132    store: WasmtimeStoreContext<'_>,
133    table: &Table,
134) -> Box<wasm_tabletype_t> {
135    Box::new(wasm_tabletype_t::new(table.ty(store)))
136}
137
138#[no_mangle]
139pub extern "C" fn wasmtime_table_get(
140    store: WasmtimeStoreContextMut<'_>,
141    table: &Table,
142    index: u32,
143    ret: &mut MaybeUninit<wasmtime_val_t>,
144) -> bool {
145    let mut scope = RootScope::new(store);
146    match table.get(&mut scope, index) {
147        Some(r) => {
148            crate::initialize(ret, wasmtime_val_t::from_val(&mut scope, r.into()));
149            true
150        }
151        None => false,
152    }
153}
154
155#[no_mangle]
156pub unsafe extern "C" fn wasmtime_table_set(
157    mut store: WasmtimeStoreContextMut<'_>,
158    table: &Table,
159    index: u32,
160    val: &wasmtime_val_t,
161) -> Option<Box<wasmtime_error_t>> {
162    let mut scope = RootScope::new(&mut store);
163    handle_result(
164        val.to_val(&mut scope)
165            .ref_()
166            .ok_or_else(|| anyhow!("wasmtime_table_set value is not a reference"))
167            .and_then(|val| table.set(scope, index, val)),
168        |()| {},
169    )
170}
171
172#[no_mangle]
173pub extern "C" fn wasmtime_table_size(store: WasmtimeStoreContext<'_>, table: &Table) -> u32 {
174    table.size(store)
175}
176
177#[no_mangle]
178pub unsafe extern "C" fn wasmtime_table_grow(
179    mut store: WasmtimeStoreContextMut<'_>,
180    table: &Table,
181    delta: u32,
182    val: &wasmtime_val_t,
183    prev_size: &mut u32,
184) -> Option<Box<wasmtime_error_t>> {
185    let mut scope = RootScope::new(&mut store);
186    handle_result(
187        val.to_val(&mut scope)
188            .ref_()
189            .ok_or_else(|| anyhow!("wasmtime_table_grow value is not a reference"))
190            .and_then(|val| table.grow(scope, delta, val)),
191        |prev| *prev_size = prev,
192    )
193}
wasmtime_c_api/table.rs

wasmtime_c_api/
table.rs
