wasmtime_c_api/
error.rs

1use crate::{wasm_frame_vec_t, wasm_name_t};
2use anyhow::{anyhow, Error, Result};
3
4#[repr(C)]
5pub struct wasmtime_error_t {
6    error: Error,
7}
8
9wasmtime_c_api_macros::declare_own!(wasmtime_error_t);
10
11impl From<Error> for wasmtime_error_t {
12    fn from(error: Error) -> wasmtime_error_t {
13        wasmtime_error_t { error }
14    }
15}
16
17impl Into<Error> for wasmtime_error_t {
18    fn into(self) -> Error {
19        self.error
20    }
21}
22
23#[unsafe(no_mangle)]
24pub extern "C" fn wasmtime_error_new(
25    msg: *const std::ffi::c_char,
26) -> Option<Box<wasmtime_error_t>> {
27    let msg_bytes = unsafe { std::ffi::CStr::from_ptr(msg).to_bytes() };
28    let msg_string = String::from_utf8_lossy(msg_bytes).into_owned();
29    Some(Box::new(wasmtime_error_t::from(anyhow!(msg_string))))
30}
31
32pub(crate) fn handle_result<T>(
33    result: Result<T>,
34    ok: impl FnOnce(T),
35) -> Option<Box<wasmtime_error_t>> {
36    match result {
37        Ok(value) => {
38            ok(value);
39            None
40        }
41        Err(error) => Some(Box::new(wasmtime_error_t { error })),
42    }
43}
44
45pub(crate) fn bad_utf8() -> Option<Box<wasmtime_error_t>> {
46    Some(Box::new(wasmtime_error_t {
47        error: anyhow!("input was not valid utf-8"),
48    }))
49}
50
51#[unsafe(no_mangle)]
52pub extern "C" fn wasmtime_error_message(error: &wasmtime_error_t, message: &mut wasm_name_t) {
53    message.set_buffer(format!("{:?}", error.error).into_bytes());
54}
55
56#[unsafe(no_mangle)]
57pub extern "C" fn wasmtime_error_exit_status(raw: &wasmtime_error_t, status: &mut i32) -> bool {
58    #[cfg(feature = "wasi")]
59    if let Some(exit) = raw.error.downcast_ref::<wasmtime_wasi::I32Exit>() {
60        *status = exit.0;
61        return true;
62    }
63
64    // Squash unused warnings in wasi-disabled builds.
65    drop((raw, status));
66
67    false
68}
69
70#[unsafe(no_mangle)]
71pub extern "C" fn wasmtime_error_wasm_trace<'a>(
72    raw: &'a wasmtime_error_t,
73    out: &mut wasm_frame_vec_t<'a>,
74) {
75    crate::trap::error_trace(&raw.error, out)
76}
wasmtime_c_api/error.rs

wasmtime_c_api/
error.rs
