cca558cd20
This commit removes `HostRef<T>` from the C API which only served the purpose now of converting each type to a `wasm_ref_t*`. Our implementation, however, does not guarantee that you'll get the same `wasm_ref_t*` for each actual underlying item (e.g. if you put a func in a table and then get the func as an export and from the table then `same` will report `false`). Additionally the fate of `wasm_ref_t*` seems somewhat unclear at this point. The change here is to make the `same` and cast functions all abort saying they're unimplemented. (similar to the host info functions). If and when we get around to reimplementing these functions we can ensure they're implemented uniformly and work well for all intended use cases.
139 lines
3.6 KiB
Rust
139 lines
3.6 KiB
Rust
use crate::{wasm_extern_t, wasm_extern_vec_t, wasm_module_t, wasm_trap_t};
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use crate::{wasm_store_t, wasmtime_error_t};
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use anyhow::Result;
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use std::ptr;
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use wasmtime::{Instance, Trap};
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#[repr(C)]
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#[derive(Clone)]
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pub struct wasm_instance_t {
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pub(crate) instance: Instance,
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}
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wasmtime_c_api_macros::declare_ref!(wasm_instance_t);
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impl wasm_instance_t {
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pub(crate) fn new(instance: Instance) -> wasm_instance_t {
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wasm_instance_t { instance: instance }
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}
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}
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#[no_mangle]
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pub unsafe extern "C" fn wasm_instance_new(
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store: &wasm_store_t,
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wasm_module: &wasm_module_t,
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imports: *const Box<wasm_extern_t>,
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result: Option<&mut *mut wasm_trap_t>,
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) -> Option<Box<wasm_instance_t>> {
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let mut instance = ptr::null_mut();
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let mut trap = ptr::null_mut();
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let err = wasmtime_instance_new(
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store,
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wasm_module,
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imports,
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wasm_module.imports.len(),
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&mut instance,
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&mut trap,
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);
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match err {
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Some(err) => {
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assert!(trap.is_null());
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assert!(instance.is_null());
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if let Some(result) = result {
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*result = Box::into_raw(err.to_trap());
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}
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None
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}
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None => {
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if instance.is_null() {
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assert!(!trap.is_null());
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if let Some(result) = result {
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*result = trap;
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} else {
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drop(Box::from_raw(trap))
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}
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None
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} else {
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assert!(trap.is_null());
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Some(Box::from_raw(instance))
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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 unsafe extern "C" fn wasmtime_instance_new(
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store: &wasm_store_t,
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module: &wasm_module_t,
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imports: *const Box<wasm_extern_t>,
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num_imports: usize,
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instance_ptr: &mut *mut wasm_instance_t,
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trap_ptr: &mut *mut wasm_trap_t,
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) -> Option<Box<wasmtime_error_t>> {
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_wasmtime_instance_new(
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store,
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module,
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std::slice::from_raw_parts(imports, num_imports),
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instance_ptr,
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trap_ptr,
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)
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}
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fn _wasmtime_instance_new(
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store: &wasm_store_t,
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module: &wasm_module_t,
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imports: &[Box<wasm_extern_t>],
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instance_ptr: &mut *mut wasm_instance_t,
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trap_ptr: &mut *mut wasm_trap_t,
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) -> Option<Box<wasmtime_error_t>> {
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let store = &store.store;
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let imports = imports
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.iter()
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.map(|import| import.which.clone())
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.collect::<Vec<_>>();
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handle_instantiate(
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Instance::new(store, &module.module, &imports),
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instance_ptr,
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trap_ptr,
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)
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}
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pub fn handle_instantiate(
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instance: Result<Instance>,
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instance_ptr: &mut *mut wasm_instance_t,
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trap_ptr: &mut *mut wasm_trap_t,
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) -> Option<Box<wasmtime_error_t>> {
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fn write<T>(ptr: &mut *mut T, val: T) {
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*ptr = Box::into_raw(Box::new(val))
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}
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match instance {
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Ok(instance) => {
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write(instance_ptr, wasm_instance_t::new(instance));
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None
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}
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Err(e) => match e.downcast::<Trap>() {
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Ok(trap) => {
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write(trap_ptr, wasm_trap_t::new(trap));
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None
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}
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Err(e) => Some(Box::new(e.into())),
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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_instance_exports(instance: &wasm_instance_t, out: &mut wasm_extern_vec_t) {
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out.set_buffer(
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instance
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.instance
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.exports()
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.map(|e| {
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Some(Box::new(wasm_extern_t {
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which: e.into_extern(),
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}))
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})
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.collect(),
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);
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}
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