Hojun-Cho
b9443b1f33
Mirrors Hare's `fs::flag` and `io::whence`:
export type flag = enum i32 {
RDONLY = 0,
WRONLY = 1,
RDWR = 2,
CREATE = 64, // 0o100
TRUNC = 512, // 0o1000
};
export type whence = enum i32 { SET = 0, CUR = 1, END = 2 };
open/tryopen/lseek signatures take the enum types (`flags: flag`,
`w: whence`) so callers get type-checked: `os.open(p, os.flag.RDONLY,
0)` is the correct shape, and `os.flag.WRONLY | os.flag.CREATE |
os.flag.TRUNC` typechecks as a `flag` via the same-named-type rule.
Callers in selfhost/cmd/{ww,w6c,w6a,w6l,wwdump} updated from
`os.O_RDONLY` etc. to `os.flag.RDONLY`. SYS_* syscall numbers kept
as `def` for now (internal-only, ABI surface, no Hare analogue in
this scope).
selfhost/test/smoke.ww keeps its standalone-compile property by
using a numeric literal (`0`, RDONLY's value) for the open flags
arg — probe 6 in 990_selfhost compiles smoke.ww with no `use`
expansion, so cross-module type refs like `os.flag.RDONLY` can't
resolve there. Untyped 0 → flag via type_isnum.
120 lines
2.5 KiB
Plaintext
120 lines
2.5 KiB
Plaintext
// selfhost/cmd/w6a/main.ww — port of cmd/w6a/main.c.
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//
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// w6a = amd64 assembler. Read .s, parse, encode, emit ELF .o.
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//
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// w6a_ww -o file.o file.s
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use os;
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use mem;
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use types;
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use lex;
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use parse;
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use asm;
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use obj;
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fn cstreq(a: *u8, lit: str) bool = {
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let n: u64 = lit.len: u64;
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let i: u64 = 0u64;
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for (i < n) {
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let li: i32 = i: i32;
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if (a[i] != lit[li]) { return false; };
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i += 1u64;
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};
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if (a[i] != 0u8) { return false; };
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return true;
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};
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fn cstrlen(p: *u8) u64 = {
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let n: u64 = 0u64;
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for (p[n] != 0u8) { n += 1u64; };
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return n;
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};
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// Slurp the whole file into a fresh buffer.
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fn slurp(path: *u8) (*u8, u64) = {
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let fd: i32 = os.open(path, os.flag.RDONLY, 0i32);
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if (fd < 0) { return nil, 0u64; };
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let szr: (i64 | os.oserror) = os.filesize(fd);
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let n: i64 = 0i64;
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match (szr) {
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case let v: i64 => n = v;
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case let e: os.oserror => { os.close(fd); return nil, 0u64; };
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};
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let nz: u64 = n: u64;
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let buf: *u8 = os.alloc(nz + 1u64): *u8;
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let rr: (i64 | os.oserror) = os.readall(fd, buf, nz);
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os.close(fd);
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let got: i64 = 0i64;
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match (rr) {
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case let v: i64 => got = v;
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case let e: os.oserror => return nil, 0u64;
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};
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if (got != n) { return nil, 0u64; };
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buf[nz] = 0u8;
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return buf, nz;
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};
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export fn main(argc: i32, argv: **u8) i32 = {
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let src: *u8 = nil;
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let out: *u8 = nil;
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let i: i32 = 1;
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for (i < argc) {
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let a: *u8 = argv[i];
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if (cstreq(a, "-o")) {
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i += 1;
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if (i >= argc) {
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os.write(2, "w6a: -o requires arg\n".ptr, 20u64);
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return 2;
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};
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out = argv[i];
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} else { if (a[0u64] == 45u8) {
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os.write(2, "w6a: unknown flag\n".ptr, 17u64);
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return 2;
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} else {
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if (src != nil) {
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os.write(2, "w6a: only one input\n".ptr, 19u64);
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return 2;
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};
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src = a;
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}; };
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i += 1;
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};
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if (src == nil) {
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os.write(2, "usage: w6a_ww -o file.o file.s\n".ptr, 30u64);
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return 2;
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};
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if (out == nil) {
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os.write(2, "w6a: missing -o\n".ptr, 15u64);
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return 2;
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};
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let buf: *u8;
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let blen: u64;
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buf, blen = slurp(src);
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if (buf == nil) {
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os.write(2, "w6a: cannot read input\n".ptr, 22u64);
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return 1;
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};
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let ar: *arena = newarena();
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let asm: asm_;
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let nlen: u64 = cstrlen(src);
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let fname: str = astrndup(ar, src, nlen);
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init(&asm, ar, fname, buf, blen);
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if (parse(&asm) != 0) { return 1; };
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if (encode(&asm) != 0) { return 1; };
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// Open output for write.
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let fd: i32 = os.open(out, os.flag.WRONLY | os.flag.CREATE | os.flag.TRUNC, 420i32); // 0o644
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if (fd < 0) {
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os.write(2, "w6a: cannot open output\n".ptr, 23u64);
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return 1;
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};
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let rc: i32 = emitelf(&asm, fd);
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os.close(fd);
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return rc;
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};
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