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wasi_process.ts
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wasi_process.ts
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import {
args_get,
args_sizes_get,
environ_get,
environ_sizes_get,
proc_exit,
fd_write,
fd_close,
fd_read,
clock_time_get,
clockid,
errnoToString,
fd
} from "./bindings/wasi_snapshot_preview1";
import {
tempbuf
} from "./wasi_internal";
import {
E_INDEXOUTOFRANGE
} from "util/error";
export namespace wasi_process {
// @ts-ignore: decorator
@lazy export const arch = sizeof<usize>() == 4 ? "wasm32" : "wasm64";
// @ts-ignore: decorator
@lazy export const platform = "wasm";
// @ts-ignore: decorator
@lazy export const argv = lazyArgv();
// @ts-ignore: decorator
@lazy export const env = lazyEnv();
// @ts-ignore: decorator
@lazy export var exitCode = 0;
export function exit(code: i32 = exitCode): void {
proc_exit(code);
}
// @ts-ignore: decorator
@lazy export const stdin = changetype<ReadableStream>(0);
// @ts-ignore: decorator
@lazy export const stdout = changetype<WritableStream>(1);
// @ts-ignore: decorator
@lazy export const stderr = changetype<WritableStream>(2);
export function time(): i64 {
let err = clock_time_get(clockid.REALTIME, 1000000, tempbuf);
if (err) throw new Error(errnoToString(err));
return load<u64>(tempbuf) / 1000000;
}
export function hrtime(): u64 {
let err = clock_time_get(clockid.MONOTONIC, 0, tempbuf);
if (err) throw new Error(errnoToString(err));
return load<u64>(tempbuf);
}
}
function lazyArgv(): string[] {
let err = args_sizes_get(tempbuf, tempbuf + sizeof<usize>());
if (err) throw new Error(errnoToString(err));
let count = load<usize>(tempbuf);
let ptrsSize = count * sizeof<usize>();
let dataSize = load<usize>(tempbuf, sizeof<usize>());
let bufSize = ptrsSize + dataSize;
let buf = __alloc(bufSize);
err = args_get(buf, buf + ptrsSize);
if (err) throw new Error(errnoToString(err));
let count32 = <i32>count;
let argv = new Array<string>(count32);
for (let i = 0; i < count32; ++i) {
let ptr = load<usize>(buf + i * sizeof<usize>());
let str = String.UTF8.decodeUnsafe(ptr, ptr + bufSize - buf, true);
argv[i] = str;
}
__free(buf);
return argv;
}
function lazyEnv(): Map<string,string> {
let err = environ_sizes_get(tempbuf, tempbuf + 4);
if (err) throw new Error(errnoToString(err));
let count = load<usize>(tempbuf);
let ptrsSize = count * sizeof<usize>();
let dataSize = load<usize>(tempbuf, sizeof<usize>());
let bufSize = ptrsSize + dataSize;
let buf = __alloc(bufSize);
err = environ_get(buf, buf + ptrsSize);
if (err) throw new Error(errnoToString(err));
let env = new Map<string,string>();
for (let i: usize = 0; i < count; ++i) {
let ptr = load<usize>(buf + i * sizeof<usize>());
let str = String.UTF8.decodeUnsafe(ptr, ptr + bufSize - buf, true);
let pos = str.indexOf("=");
if (~pos) {
env.set(str.substring(0, pos), str.substring(pos + 1));
// __dispose(changetype<usize>(str));
} else {
env.set(str, "");
}
}
__free(buf);
return env;
}
@unmanaged
abstract class Stream {
close(): void {
var err = fd_close(<u32>changetype<usize>(this));
if (err) throw new Error(errnoToString(err));
}
}
@unmanaged
abstract class WritableStream extends Stream {
write<T>(data: T): void {
if (isString<T>()) {
writeString(<u32>changetype<usize>(this), changetype<string>(data));
} else if (data instanceof ArrayBuffer) {
writeBuffer(<u32>changetype<usize>(this), data);
} else {
ERROR("String or ArrayBuffer expected");
}
}
}
@unmanaged
abstract class ReadableStream extends Stream {
read(buffer: ArrayBuffer, offset: isize = 0): i32 {
var end = <usize>buffer.byteLength;
if (offset < 0 || <usize>offset > end) {
throw new Error(E_INDEXOUTOFRANGE);
}
store<usize>(tempbuf, changetype<usize>(buffer) + offset);
store<usize>(tempbuf, end - offset, sizeof<usize>());
var err = fd_read(<u32>changetype<usize>(this), tempbuf, 1, tempbuf + 2 * sizeof<usize>());
if (err) throw new Error(errnoToString(err));
return <i32>load<isize>(tempbuf, 2 * sizeof<usize>());
}
}
function writeBuffer(fd: fd, data: ArrayBuffer): void {
store<usize>(tempbuf, changetype<usize>(data));
store<usize>(tempbuf, data.byteLength, sizeof<usize>());
var err = fd_write(<u32>fd, tempbuf, 1, tempbuf + 2 * sizeof<usize>());
if (err) throw new Error(errnoToString(err));
}
function writeString(fd: fd, data: string): void {
var len = data.length;
var
char2: u32 = 0,
char3: u32 = 0,
char4: u32 = 0;
switch (len) {
case 4: { // "null"
char4 = <u32>load<u16>(changetype<usize>(data), 6);
if (char4 >= 0x80) break;
}
case 3: { // "ms\n"
char3 = <u32>load<u16>(changetype<usize>(data), 4);
if (char3 >= 0x80) break;
}
case 2: { // "\r\n"
char2 = <u32>load<u16>(changetype<usize>(data), 2);
if (char2 >= 0x80) break;
}
case 1: { // "\n"
let char1 = <u32>load<u16>(changetype<usize>(data));
if (char1 >= 0x80) break;
store<usize>(tempbuf, tempbuf + 2 * sizeof<usize>());
store<usize>(tempbuf, len, sizeof<usize>());
store<u32>(tempbuf, char1 | char2 << 8 | char3 << 16 | char4 << 24, 2 * sizeof<usize>());
let err = fd_write(<u32>fd, tempbuf, 1, tempbuf + 3 * sizeof<usize>());
if (err) throw new Error(errnoToString(err));
}
case 0: return;
}
var utf8len = <usize>String.UTF8.byteLength(data);
var utf8buf = __alloc(utf8len);
assert(String.UTF8.encodeUnsafe(changetype<usize>(data), len, utf8buf) == utf8len);
store<usize>(tempbuf, utf8buf);
store<usize>(tempbuf, utf8len, sizeof<usize>());
var err = fd_write(<u32>fd, tempbuf, 1, tempbuf + 2 * sizeof<usize>());
__free(utf8buf);
if (err) throw new Error(errnoToString(err));
}