language-servers/roc
1
0
Fork 0
mirror of https://github.com/roc-lang/roc.git synced 2025-09-30 15:21:12 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 6

Fix WASI fd_write in the Wasm interpreter

Browse source
This commit is contained in:
Brian Carroll 2023-04-17 22:24:52 +01:00
parent 2480dbbf1f
commit 0cf42231d6
No known key found for this signature in database
GPG key ID: 5C7B2EC4101703C0
1 changed files with 4 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

12
crates/wasm_interp/src/wasi.rs
View file

@ -54,7 +54,6 @@ impl<'a> WasiDispatcher<'a> {
memory: &mut [u8],
) -> Option<Value> {
let success_code = Some(Value::I32(Errno::Success as i32));
match function_name {
"args_get" => {
// uint8_t ** argv,
@ -241,14 +240,15 @@ impl<'a> WasiDispatcher<'a> {
let mut n_written: i32 = 0;
let mut negative_length_count = 0;
for _ in 0..iovs_len {
for i in 0..iovs_len {
// https://man7.org/linux/man-pages/man2/readv.2.html
// struct iovec {
// void *iov_base; /* Starting address */
// size_t iov_len; /* Number of bytes to transfer */
// };
let iov_base = read_u32(memory, ptr_iovs) as usize;
let iov_len = read_i32(memory, ptr_iovs + 4);
let ptr_iov = ptr_iovs + (8 * i as usize); // index into the array of iovec's
let iov_base = read_u32(memory, ptr_iov) as usize;
let iov_len = read_i32(memory, ptr_iov + 4);
if iov_len < 0 {
// I found negative-length iov's when I implemented this in JS for the web REPL (see wasi.js)
// I'm not sure why, but this solution worked, and it's the same WASI libc - there's only one.
@ -261,13 +261,9 @@ impl<'a> WasiDispatcher<'a> {
match &mut write_lock {
WriteLock::StdOut(stdout) => {
n_written += stdout.write(bytes).unwrap() as i32;
// in practice, the newline is not included in iov_len
stdout.write(b"\n").unwrap();
}
WriteLock::Stderr(stderr) => {
n_written += stderr.write(bytes).unwrap() as i32;
// in practice, the newline is not included in iov_len
stderr.write(b"\n").unwrap();
}
WriteLock::RegularFile(content) => {
content.extend_from_slice(bytes);