Hojun-Cho/ww
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

cmd+selfhost+test: predeclare nomem in universe scope

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

17
selfhost/cmd/wcc/check.ww
View File

@@ -63,6 +63,23 @@ fn seedprimitives(c: *checker) void = {
scopedefine(c.top, "f64", skind.SK_TYPE, c.tc.tyf64, nil);
scopedefine(c.top, "str", skind.SK_TYPE, c.tc.tystr, nil);
scopedefine(c.top, "never", skind.SK_TYPE, c.tc.tynever, nil);
// #29: predeclare `type nomem = !void;` so user code needn't
// declare it locally. Synthesize an nkind.N_TYPEDECL whose lhs is
// nkind.N_TBANG{nkind.N_TNAME("void")} so varianterr and other
// iserror-aware paths treat `nomem` identically to a user-written
// alias. Mirrors cmd/wcc/check.c lookup_builtin returning
// ty_nomem (NAMED, under=ty_void, iserror=1). Note: cgen owns a
// separate alias chain — see collectaliases in cgen.ww for the
// companion seed.
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 nomemdecl: *node = newnode(c.a, nkind.N_TYPEDECL, empty, 0, 0);
nomemdecl.str = "nomem";
nomemdecl.lhs = bang;
scopedefine(c.top, "nomem", skind.SK_TYPE, nil, nomemdecl);
// `nil`, `true`, `false` are keywords — handled at the lex/parser
// level, no symbol needed.
// `len`, `alloc`, `free`, `append` are pseudo-builtins; scopedefine