caspervonb/deno-wasi

A (WIP) WebAssembly System Interface implementation for Deno

WebAssembly System Interface implementation for Deno

Note: This module has been merged into Deno, further development will take place in the Deno repository

This package provides an implementation of the WebAssembly System Interface for the Deno TypeScript runtime.

Status

This is a work in progress so if a function isn't implemented, hit refresh.

Name	Status	Notes
args_get	✓
args_sizes_get	✓
environ_get	✓
environ_sizes_get	✓
clock_res_get	✓
clock_time_get	✓
fd_advise		This has no obvious path to implementation at this time.
fd_allocate		This has no obvious path to implementation at this time.
fd_close	✓
fd_datasync		This is blocking on getting fdatasync(2) implemented upstream in Deno.
fd_fdstat_get	✓	This currently does not write flags and rights as we do not track those at the moment.
fd_fdstat_set_flags		This has no obvious path to implementation at this time.
fd_fdstat_set_rights
fd_filestat_get		This is blocking on getting fstat implemented upstream in Deno.
fd_filestat_set_size		This is blocking on getting ftruncate implemented upstream in Deno.
fd_filestat_set_times	✓
fd_pread	✓
fd_prestat_get	✓
fd_prestat_dir_name	✓
fd_pwrite	✓
fd_read	✓
fd_readdir
fd_renumber	✓
fd_seek	✓
fd_sync	✓	This is blocking on getting fsync(2) implemented upstream in Deno.
fd_tell	✓
fd_write	✓
path_create_directory	✓
path_filestat_get	✓
path_filestat_set_times	✓
path_link	✓
path_open	✓	Opening directories is not portable
path_readlink	✓
path_remove_directory	✓
path_rename	✓
path_symlink	✓
path_unlink_file	✓
poll_oneoff	✓
proc_exit	✓
proc_raise
sched_yield
random_get	✓
sock_recv
sock_send
sock_shutdown

Example

	instance.exports._start();
} else if (module.exports._initialize) {
import WASI from "https://deno.land/x/wasi/mod.ts";

const wasi = new WASI({
	args: Deno.args,
	env: Deno.env,
});

const binary = Deno.readAll("command.wasm");
const module = await WebAssembly.compile(binary);
const instance = await WebAssembly.instantiate(module, {
	wasi_snapshot_preview1: wasi.exports,
});

wasi.memory = module.exports.memory;

if (module.exports._start) {
	instance.exports._initialize();
} else {
	throw new Error("No entry point found");
}

deno-wasi's Issues

Implement `fd_truncate`

Implementing fd_truncate is blocking on getting upstream support from Deno.

See denoland/deno#5767

Seeking with large files

Deno currently only supports seeking on 32 bit integer offsets, where-as WASI expects offsets to be 64 bit wide.

Implement `fd_sync`

This is blocking on Deno getting an op for it.

Some function parameters incorrectly take a number where they should take a bigint

This has no observable effect on WebAssembly modules but some functions do have wrong type annotations as I just annotated everything with number.

Implement `fd_datasync`

Blocking on Deno making this an accessible op

Extract test suite into wasi-tests

So finally switched to real tests which means we can eventually extract the testadata into it's own repository and pull it back in as a submodule so it can be shared with web-wasi.