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kateinoigakukunkateinoigakukun
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Merge pull request #5 from uswriting/mfs
feat: memory file system
2 parents df2d317 + fba33d3 commit 6392c62

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-286
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4 files changed

+1146
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‎src/abi.ts

+200-147
Original file line numberDiff line numberDiff line change
@@ -1,156 +1,209 @@
11
export class WASIAbi {
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/**
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* No error occurred. System call completed successfully.
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*/
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static readonly WASI_ESUCCESS = 0;
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/**
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* Bad file descriptor.
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*/
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static readonly WASI_ERRNO_BADF = 8;
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/**
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* Function not supported.
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*/
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static readonly WASI_ENOSYS = 52;
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/**
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* The clock measuring real time. Time value zero corresponds with 1970-01-01T00:00:00Z.
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*/
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static readonly WASI_CLOCK_REALTIME = 0;
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/**
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* The store-wide monotonic clock, which is defined as a clock measuring real time,
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* whose value cannot be adjusted and which cannot have negative clock jumps.
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* The epoch of this clock is undefined. The absolute time value of this clock therefore has no meaning.
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*/
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static readonly WASI_CLOCK_MONOTONIC = 1;
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/**
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* The file descriptor or file refers to a character device inode.
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*/
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static readonly WASI_FILETYPE_CHARACTER_DEVICE = 2;
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static readonly IMPORT_FUNCTIONS = [
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"args_get",
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"args_sizes_get",
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"clock_res_get",
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"clock_time_get",
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"environ_get",
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"environ_sizes_get",
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"fd_advise",
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"fd_allocate",
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"fd_close",
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"fd_datasync",
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"fd_fdstat_get",
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"fd_fdstat_set_flags",
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"fd_fdstat_set_rights",
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"fd_filestat_get",
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"fd_filestat_set_size",
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"fd_filestat_set_times",
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"fd_pread",
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"fd_prestat_dir_name",
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"fd_prestat_get",
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"fd_pwrite",
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"fd_read",
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"fd_readdir",
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"fd_renumber",
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"fd_seek",
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"fd_sync",
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"fd_tell",
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"fd_write",
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"path_create_directory",
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"path_filestat_get",
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"path_filestat_set_times",
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"path_link",
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"path_open",
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"path_readlink",
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"path_remove_directory",
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"path_rename",
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"path_symlink",
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"path_unlink_file",
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"poll_oneoff",
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"proc_exit",
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"proc_raise",
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"random_get",
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"sched_yield",
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"sock_accept",
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"sock_recv",
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"sock_send",
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"sock_shutdown",
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]
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private encoder: TextEncoder;
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constructor() {
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this.encoder = new TextEncoder();
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}
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writeString(memory: DataView, value: string, offset: number): number {
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const bytes = this.encoder.encode(value);
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const buffer = new Uint8Array(memory.buffer, offset, bytes.length);
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buffer.set(bytes);
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return bytes.length;
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}
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byteLength(value: string): number {
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return this.encoder.encode(value).length;
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}
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private static readonly iovec_t = {
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size: 8,
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bufferOffset: 0,
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lengthOffset: 4,
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}
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iovViews(memory: DataView, iovs: number, iovsLen: number): Uint8Array[] {
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const iovsBuffers: Uint8Array[] = [];
116-
let iovsOffset = iovs;
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for (let i = 0; i < iovsLen; i++) {
119-
const offset = memory.getUint32(iovsOffset + WASIAbi.iovec_t.bufferOffset, true);
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const len = memory.getUint32(iovsOffset + WASIAbi.iovec_t.lengthOffset, true);
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iovsBuffers.push(new Uint8Array(memory.buffer, offset, len));
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iovsOffset += WASIAbi.iovec_t.size;
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}
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return iovsBuffers;
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}
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writeFilestat(memory: DataView, ptr: number, filetype: number): void {
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memory.setBigUint64(ptr, /* dev */ BigInt(0), true);
130-
memory.setBigUint64(ptr + 8, /* ino */ BigInt(0), true);
131-
memory.setUint8(ptr + 16, filetype);
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memory.setUint32(ptr + 24, /* nlink */ 0, true);
133-
memory.setBigUint64(ptr + 32, /* size */ BigInt(0), true);
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memory.setBigUint64(ptr + 40, /* atim */ BigInt(0), true);
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memory.setBigUint64(ptr + 48, /* mtim */ BigInt(0), true);
136-
}
137-
138-
writeFdstat(memory: DataView, ptr: number, filetype: number, flags: number): void {
139-
memory.setUint8(ptr, filetype);
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memory.setUint16(ptr + 2, flags, true);
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memory.setBigUint64(ptr + 8, /* rights_base */ BigInt(0), true);
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memory.setBigUint64(ptr + 16, /* rights_inheriting */ BigInt(0), true);
2+
/**
3+
* No error occurred. System call completed successfully.
4+
*/
5+
static readonly WASI_ESUCCESS = 0;
6+
7+
/**
8+
* Bad file descriptor.
9+
*/
10+
static readonly WASI_ERRNO_BADF = 8;
11+
12+
/**
13+
* Function not supported.
14+
*/
15+
static readonly WASI_ENOSYS = 52;
16+
17+
/**
18+
* The clock measuring real time. Time value zero corresponds with 1970-01-01T00:00:00Z.
19+
*/
20+
static readonly WASI_CLOCK_REALTIME = 0;
21+
/**
22+
* The store-wide monotonic clock, which is defined as a clock measuring real time,
23+
* whose value cannot be adjusted and which cannot have negative clock jumps.
24+
* The epoch of this clock is undefined. The absolute time value of this clock therefore has no meaning.
25+
*/
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static readonly WASI_CLOCK_MONOTONIC = 1;
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/**
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* The file descriptor or file refers to a directory.
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*/
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static readonly WASI_ERRNO_ISDIR = 31;
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/**
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* Invalid argument.
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*/
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static readonly WASI_ERRNO_INVAL = 28;
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/**
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* Not a directory or a symbolic link to a directory.
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*/
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static readonly WASI_ERRNO_NOTDIR = 54;
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/**
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* No such file or directory.
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*/
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static readonly WASI_ERRNO_NOENT = 44;
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/**
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* File exists.
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*/
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static readonly WASI_ERRNO_EXIST = 20;
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/**
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* I/O error.
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*/
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static readonly WASI_ERRNO_IO = 29;
52+
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/**
54+
* The file descriptor or file refers to a character device inode.
55+
*/
56+
static readonly WASI_FILETYPE_CHARACTER_DEVICE = 2;
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/**
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* The file descriptor or file refers to a directory inode.
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*/
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static readonly WASI_FILETYPE_DIRECTORY = 3;
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/**
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* The file descriptor or file refers to a regular file inode.
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*/
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static readonly WASI_FILETYPE_REGULAR_FILE = 4;
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66+
static readonly IMPORT_FUNCTIONS = [
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"args_get",
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"args_sizes_get",
69+
70+
"clock_res_get",
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"clock_time_get",
72+
73+
"environ_get",
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"environ_sizes_get",
75+
76+
"fd_advise",
77+
"fd_allocate",
78+
"fd_close",
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"fd_datasync",
80+
"fd_fdstat_get",
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"fd_fdstat_set_flags",
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"fd_fdstat_set_rights",
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"fd_filestat_get",
84+
"fd_filestat_set_size",
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"fd_filestat_set_times",
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"fd_pread",
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"fd_prestat_dir_name",
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"fd_prestat_get",
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"fd_pwrite",
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"fd_read",
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"fd_readdir",
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"fd_renumber",
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"fd_seek",
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"fd_sync",
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"fd_tell",
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"fd_write",
97+
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"path_create_directory",
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"path_filestat_get",
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"path_filestat_set_times",
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"path_link",
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"path_open",
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"path_readlink",
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"path_remove_directory",
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"path_rename",
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"path_symlink",
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"path_unlink_file",
108+
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"poll_oneoff",
110+
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"proc_exit",
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"proc_raise",
113+
114+
"random_get",
115+
116+
"sched_yield",
117+
118+
"sock_accept",
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"sock_recv",
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"sock_send",
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"sock_shutdown",
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];
123+
124+
private encoder: TextEncoder;
125+
private decoder: TextDecoder;
126+
127+
constructor() {
128+
this.encoder = new TextEncoder();
129+
this.decoder = new TextDecoder();
130+
}
131+
132+
writeString(memory: DataView, value: string, offset: number): number {
133+
const bytes = this.encoder.encode(value);
134+
const buffer = new Uint8Array(memory.buffer, offset, bytes.length);
135+
buffer.set(bytes);
136+
return bytes.length;
137+
}
138+
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readString(memory: DataView, ptr: number, len: number): string {
140+
const buffer = new Uint8Array(memory.buffer, ptr, len);
141+
return this.decoder.decode(buffer);
142+
}
143+
144+
byteLength(value: string): number {
145+
return this.encoder.encode(value).length;
146+
}
147+
148+
private static readonly iovec_t = {
149+
size: 8,
150+
bufferOffset: 0,
151+
lengthOffset: 4,
152+
};
153+
154+
iovViews(memory: DataView, iovs: number, iovsLen: number): Uint8Array[] {
155+
const iovsBuffers: Uint8Array[] = [];
156+
let iovsOffset = iovs;
157+
158+
for (let i = 0; i < iovsLen; i++) {
159+
const offset = memory.getUint32(
160+
iovsOffset + WASIAbi.iovec_t.bufferOffset,
161+
true
162+
);
163+
const len = memory.getUint32(
164+
iovsOffset + WASIAbi.iovec_t.lengthOffset,
165+
true
166+
);
167+
168+
iovsBuffers.push(new Uint8Array(memory.buffer, offset, len));
169+
iovsOffset += WASIAbi.iovec_t.size;
143170
}
171+
return iovsBuffers;
172+
}
173+
174+
writeFilestat(memory: DataView, ptr: number, filetype: number): void {
175+
memory.setBigUint64(ptr, /* dev */ BigInt(0), true);
176+
memory.setBigUint64(ptr + 8, /* ino */ BigInt(0), true);
177+
memory.setUint8(ptr + 16, filetype);
178+
memory.setUint32(ptr + 24, /* nlink */ 0, true);
179+
memory.setBigUint64(ptr + 32, /* size */ BigInt(0), true);
180+
memory.setBigUint64(ptr + 40, /* atim */ BigInt(0), true);
181+
memory.setBigUint64(ptr + 48, /* mtim */ BigInt(0), true);
182+
}
183+
184+
writeFdstat(
185+
memory: DataView,
186+
ptr: number,
187+
filetype: number,
188+
flags: number
189+
): void {
190+
memory.setUint8(ptr, filetype);
191+
memory.setUint16(ptr + 2, flags, true);
192+
memory.setBigUint64(ptr + 8, /* rights_base */ BigInt(0), true);
193+
memory.setBigUint64(ptr + 16, /* rights_inheriting */ BigInt(0), true);
194+
}
144195
}
145196

146197
/**
147198
* An exception that is thrown when the process exits.
148199
**/
149200
export class WASIProcExit {
150-
constructor(public readonly code: number) { }
151-
152-
/** @deprecated Use 'code' instead.
153-
* Has been renamed to have loose compatibility
154-
* with other implementations **/
155-
get exitCode() { return this.code; }
201+
constructor(public readonly code: number) {}
202+
203+
/** @deprecated Use 'code' instead.
204+
* Has been renamed to have loose compatibility
205+
* with other implementations **/
206+
get exitCode() {
207+
return this.code;
208+
}
156209
}

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