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denoland-deno/std/wasi
tokiedokie 3d65177dbc
docs(std): version all imports in README (#7442)
Use $STD_VERSION in std/ README files to automatically
display proper version.
2020-10-04 14:18:36 +02:00
..
testdata@7f8aa6ba62 test(std/wasi): add fd_renumber test (#7574) 2020-09-21 15:17:01 +02:00
README.md docs(std): version all imports in README (#7442) 2020-10-04 14:18:36 +02:00
snapshot_preview1.ts chore(std/wasi): enable and fix lint errors in snapshot_preview1 (#7360) 2020-09-29 11:41:22 +02:00
snapshot_preview1_test.ts test(std/wasi): add fd_renumber test (#7574) 2020-09-21 15:17:01 +02:00
snapshot_preview1_test_runner.ts chore(std/wasi): enable and fix lint errors in snapshot_preview1 (#7360) 2020-09-29 11:41:22 +02:00

wasi

This module provides an implementation of the WebAssembly System Interface.

Supported Syscalls

wasi_snapshot_preview1

  • args_get
  • args_sizes_get
  • environ_get
  • environ_sizes_get
  • clock_res_get
  • clock_time_get
  • fd_advise
  • fd_allocate
  • fd_close
  • fd_datasync
  • fd_fdstat_get
  • fd_fdstat_set_flags
  • fd_fdstat_set_rights
  • fd_filestat_get
  • fd_filestat_set_size
  • 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
  • fd_tell
  • fd_write
  • path_create_directory
  • path_filestat_get
  • path_filestat_set_times
  • path_link
  • path_open
  • 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

Usage

import Context from "https://deno.land/std@$STD_VERSION/wasi/snapshot_preview1.ts";

const context = new Context({
  args: Deno.args,
  env: Deno.env.toObject(),
});

const binary = await Deno.readFile("path/to/your/module.wasm");
const module = await WebAssembly.compile(binary);
const instance = await WebAssembly.instantiate(module, {
  "wasi_snapshot_preview1": context.exports,
});

const {
  _start: start,
  _initialize: initialize,
  memory,
} = instance.exports;

context.memory = memory as WebAssembly.Memory;

if (start instanceof Function) {
  start();
} else if (initialize instanceof Function) {
  initialize();
} else {
  throw new Error(
    "No '_start' or '_initialize' entry point found in WebAssembly module, make sure to compile with wasm32-wasi as the target.",
  );
}