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cmd+selfhost+test: predeclare nomem in universe scope

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Per Hare convention, `nomem` is a language-level error type — no
import required, in scope alongside void/done/rune/str. ref/hare uses
it bare at errors/string.ha:14, types/c/strings.ha:89, net/uri/parse.ha:17
with no `use`. Precondition for graduating the `alloc` builtin to
`(*T | nomem)` returns.

cstage: ty_nomem is NAMED{under=ty_void, iserror=1}, installed by
typesinit and surfaced via lookup_builtin. wwstage seeds the same
shape in both check.ww (scope) and cgen.ww (aliases) — separate
tables, both consulted; without the cgen seed wwstage drops the
zero-init for `let e: nomem;` locals and breaks byte-identity.

Tests: tagged_ptr_ret.ww and trypromote.ww drop their local
`type nomem = !void;` aliases. 990_selfhost.c adds a regression that
a value named `nomem` does not collide with the predeclared type.
This commit is contained in:
Hojun-Cho
2026-05-19 19:50:38 +09:00
parent ea76ee4aa3
commit d27411d833
10 changed files with 146 additions and 11 deletions
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21
selfhost/cmd/wcc/cgen.ww
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@@ -55,6 +55,27 @@ type aliasent = struct {
fn collectaliases(c: *cgen, file: *node) void = {
c.aliases = nil;
// #29: seed `type nomem = !void;` here AS WELL AS in check.ww's
// seedprimitives. The two seeds aren't redundant: wwstage's check
// owns c.top (used by name resolution); cgen owns its own
// c.aliases chain (used by resolvetype / slotsize / TBANG checks).
// Without this seed, resolvetype("nomem") returns the raw N_TNAME
// — slotsize falls through to 8B without zero-init, diverging from
// cstage's `let e: nomem;` MOVQ $0 emit on the slot (rule 10).
// Inserted at the head so the user-decl loop below prepends; the
// same-module / any-match passes in aliaslookup then let a local
// `type nomem = !void;` shadow this fallback within its module.
let empty: str;
let tnvoid: *node = newnode(c.a, nkind.N_TNAME, empty, 0, 0);
tnvoid.str = "void";
let bang: *node = newnode(c.a, nkind.N_TBANG, empty, 0, 0);
bang.lhs = tnvoid;
let nomemal: *aliasent = amalloc(c.a, 64u64): *aliasent;
nomemal.aname = "nomem";
nomemal.amod = empty;
nomemal.target = bang;
nomemal.aanext = nil;
c.aliases = nomemal;
let d: *node = file.list;
for (d != nil) {
if (d.kind == nkind.N_TYPEDECL) {