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instance.rs
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instance.rs
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use crate::{
wasm_extern_t, wasm_extern_vec_t, wasm_module_t, wasm_store_t, wasm_trap_t, wasmtime_error_t,
wasmtime_extern_t, wasmtime_module_t, CStoreContextMut, StoreRef,
};
use std::mem::MaybeUninit;
use wasmtime::{Instance, Trap};
#[derive(Clone)]
pub struct wasm_instance_t {
store: StoreRef,
instance: Instance,
}
wasmtime_c_api_macros::declare_ref!(wasm_instance_t);
impl wasm_instance_t {
pub(crate) fn new(store: StoreRef, instance: Instance) -> wasm_instance_t {
wasm_instance_t { store, instance }
}
}
#[no_mangle]
pub unsafe extern "C" fn wasm_instance_new(
store: &mut wasm_store_t,
wasm_module: &wasm_module_t,
imports: *const wasm_extern_vec_t,
result: Option<&mut *mut wasm_trap_t>,
) -> Option<Box<wasm_instance_t>> {
let imports = (*imports)
.as_slice()
.iter()
.filter_map(|import| match import {
Some(i) => Some(i.which.clone()),
None => None,
})
.collect::<Vec<_>>();
match Instance::new(store.store.context_mut(), &wasm_module.module, &imports) {
Ok(instance) => Some(Box::new(wasm_instance_t::new(
store.store.clone(),
instance,
))),
Err(e) => {
if let Some(ptr) = result {
*ptr = Box::into_raw(Box::new(wasm_trap_t::new(e)));
}
None
}
}
}
#[no_mangle]
pub unsafe extern "C" fn wasm_instance_exports(
instance: &mut wasm_instance_t,
out: &mut wasm_extern_vec_t,
) {
let store = instance.store.clone();
out.set_buffer(
instance
.instance
.exports(instance.store.context_mut())
.map(|e| {
Some(Box::new(wasm_extern_t {
which: e.into_extern(),
store: store.clone(),
}))
})
.collect(),
);
}
#[no_mangle]
pub unsafe extern "C" fn wasmtime_instance_new(
store: CStoreContextMut<'_>,
module: &wasmtime_module_t,
imports: *const wasmtime_extern_t,
nimports: usize,
instance: &mut Instance,
trap_ptr: &mut *mut wasm_trap_t,
) -> Option<Box<wasmtime_error_t>> {
let imports = crate::slice_from_raw_parts(imports, nimports)
.iter()
.map(|i| i.to_extern())
.collect::<Vec<_>>();
handle_instantiate(
Instance::new(store, &module.module, &imports),
instance,
trap_ptr,
)
}
pub(crate) fn handle_instantiate(
instance: anyhow::Result<Instance>,
instance_ptr: &mut Instance,
trap_ptr: &mut *mut wasm_trap_t,
) -> Option<Box<wasmtime_error_t>> {
match instance {
Ok(i) => {
*instance_ptr = i;
None
}
Err(e) => {
if e.is::<Trap>() {
*trap_ptr = Box::into_raw(Box::new(wasm_trap_t::new(e)));
None
} else {
Some(Box::new(e.into()))
}
}
}
}
#[no_mangle]
pub unsafe extern "C" fn wasmtime_instance_export_get(
store: CStoreContextMut<'_>,
instance: &Instance,
name: *const u8,
name_len: usize,
item: &mut MaybeUninit<wasmtime_extern_t>,
) -> bool {
let name = crate::slice_from_raw_parts(name, name_len);
let name = match std::str::from_utf8(name) {
Ok(name) => name,
Err(_) => return false,
};
match instance.get_export(store, name) {
Some(e) => {
crate::initialize(item, e.into());
true
}
None => false,
}
}
#[no_mangle]
pub unsafe extern "C" fn wasmtime_instance_export_nth(
store: CStoreContextMut<'_>,
instance: &Instance,
index: usize,
name_ptr: &mut *const u8,
name_len: &mut usize,
item: &mut MaybeUninit<wasmtime_extern_t>,
) -> bool {
match instance.exports(store).nth(index) {
Some(e) => {
*name_ptr = e.name().as_ptr();
*name_len = e.name().len();
crate::initialize(item, e.into_extern().into());
true
}
None => false,
}
}