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