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try to read the callback after the panic

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Brian Carroll 2022-07-09 20:39:27 +01:00 • committed by Folkert
parent a8dcd38ef3
commit eb90af7e0d
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1 changed files with 14 additions and 11 deletions
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25
crates/compiler/test_gen/src/helpers/wasm.rs
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@ -5,6 +5,7 @@ use roc_gen_wasm::wasm32_result::Wasm32Result;
use roc_gen_wasm::wasm_module::{Export, ExportType};
use roc_gen_wasm::{DEBUG_SETTINGS, MEMORY_NAME};
use roc_load::Threading;
use std::cell::Cell;
use std::collections::hash_map::DefaultHasher;
use std::hash::{Hash, Hasher};
use std::marker::PhantomData;
@ -214,22 +215,16 @@ where
let mut module = rt.load_module(module).expect("Unable to load module");
let mut panic_msg: Option<String> = None;
let panic_msg = Cell::<Option<(i32, i32)>>::new(None);
module.link_wasi().unwrap();
module
.link_closure(
"env",
"send_panic_msg_to_rust",
|call_context, (msg_ptr, msg_len): (i32, i32)| {
let memory: &[u8] = unsafe {
let memory_ptr: *const [u8] = call_context.memory();
let (_, memory_size) = std::mem::transmute::<_, (usize, usize)>(memory_ptr);
std::slice::from_raw_parts(memory_ptr as _, memory_size)
};
let msg_bytes = &memory[msg_ptr as usize..][msg_len as usize..];
let msg = std::str::from_utf8(msg_bytes).unwrap();
panic_msg = Some(msg.into());
|_call_context, args: (i32, i32)| {
let swappy = Cell::new(Some(args));
panic_msg.swap(&swappy);
Ok(())
},
)
@ -241,7 +236,15 @@ where
match test_wrapper.call() {
Err(e) => {
if let Some(msg) = panic_msg {
if let Some((msg_ptr, msg_len)) = panic_msg.into_inner() {
let memory: &[u8] = unsafe {
let memory_ptr: *const [u8] = rt.memory();
let (_, memory_size) = std::mem::transmute::<_, (usize, usize)>(memory_ptr);
std::slice::from_raw_parts(memory_ptr as _, memory_size)
};
let msg_bytes = &memory[msg_ptr as usize..][msg_len as usize..];
let msg = std::str::from_utf8(msg_bytes).unwrap();
Err(format!("Roc failed with message: \"{}\"", msg))
} else {
Err(format!("{}", e))