Hojun-Cho
7a4f60b041
Two cgen/check bugs surfaced by new lib modules, plus the modules
themselves (crc64, siphash, random, base64, base32).
1. `(big_u64): u32` (and `: u16`, `: u8`, `: bool`) didn't truncate.
N_CAST emitted nothing for int↔int; the value stayed in AX with
its upper bits intact and downstream CMPQ/DIVQ misread the slot.
The TK_TILDE path already had clamp logic for the same reason —
N_CAST was the missing case. Both stages now MOVL r,r for u32 and
ANDQ $mask for u8/u16/bool. Signed-narrow (i8/i16/i32) stays
no-op until w6a grows reg-reg MOVSBQ/MOVSWQ/MOVSXD. selfhost
cgcast walks alias chains via aliaslookup before checking
primsize/typenameisunsigned so `(u: random)` where
`type random = u64` still bypasses the clamp.
See cmd/w6c/cgen.c N_CAST and selfhost/cmd/wcc/cgenexpr.ww cgcast.
2. `mod.mod` type refs (`random.random` when the imported module
declares `export type random = u64;`) failed with "unknown type".
The driver concatenates imports into one flat scope, so SK_USE
`random` collided with SK_TYPE `random` and scope_define silently
dropped the use. resolve_typename's leaf lookup required
`kind == SK_USE` and gave up. Adds a `use_alias` flag to Sym; the
pass-1 decl scan now marks colliding syms in both directions
(use-after-type and type-after-use). resolve_typename and the
N_DOT cexpr branch treat `use_alias` like SK_USE for qualified
lookup. selfhost check.ww was already lenient on this path so no
ww-side change was needed; bootstrap fixed point (990-995) holds.
See cmd/wcc/check.c installdecl pass + N_DOT/resolve_typename and
cmd/wcc/ww.h Sym.use_alias.
New modules under lib/, each with @test vectors in *_test.ww and wired
into test/wcc/900_stdlib.c (26 modules → all compile):
- lib/hash/crc64 ECMA, ISO (mirror of crc32 shape)
- lib/hash/siphash SipHash-2-4, buffer-based sum/sum24
- lib/math/random SplitMix64 (init, next, u32n, u64n)
- lib/encoding/base64 RFC 4648 std + url-safe encode/decode + sizes
- lib/encoding/base32 RFC 4648 std + base32hex encode/decode + sizes
62 lines
1.5 KiB
Plaintext
62 lines
1.5 KiB
Plaintext
use random;
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@test fn seq() void = {
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let r: random.random = random.init(1234567u64);
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if (random.next(&r) != 6457827717110365317u64) { let _: i32 = 1/0; };
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if (random.next(&r) != 3203168211198807973u64) { let _: i32 = 1/0; };
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if (random.next(&r) != 9817491932198370423u64) { let _: i32 = 1/0; };
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if (random.next(&r) != 4593380528125082431u64) { let _: i32 = 1/0; };
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if (random.next(&r) != 16408922859458223821u64) { let _: i32 = 1/0; };
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};
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@test fn deterministic() void = {
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let a: random.random = random.init(42u64);
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let b: random.random = random.init(42u64);
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let i: i32 = 0;
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for (i < 32) {
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if (random.next(&a) != random.next(&b)) { let _: i32 = 1/0; };
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i += 1;
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};
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};
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@test fn u32n_inrange() void = {
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let r: random.random = random.init(7u64);
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let i: i32 = 0;
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for (i < 200) {
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let v: u32 = random.u32n(&r, 17u32);
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// v stored as u64 with possible high bits — mask before compare.
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let vv: u64 = (v: u64) & 0xFFFFFFFFu64;
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if (vv >= 17u64) { let _: i32 = 1/0; };
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i += 1;
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};
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};
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@test fn u64n_pow2() void = {
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let r: random.random = random.init(99u64);
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let i: i32 = 0;
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for (i < 200) {
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let v: u64 = random.u64n(&r, 16u64);
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if (v >= 16u64) { let _: i32 = 1/0; };
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i += 1;
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};
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};
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@test fn u64n_nonpow2() void = {
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let r: random.random = random.init(123u64);
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let i: i32 = 0;
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for (i < 200) {
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let v: u64 = random.u64n(&r, 100u64);
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if (v >= 100u64) { let _: i32 = 1/0; };
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i += 1;
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};
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};
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export fn main() i32 = {
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seq();
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deterministic();
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u32n_inrange();
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u64n_pow2();
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u64n_nonpow2();
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return 0;
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};
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