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selfhost+cstage+test: graduate alias-chain unwrap to transitive (#22)

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Single-peel TY_NAMED.under bottoms out at the inner alias when
chain length is 2+, surfaces in two stages with different
mechanisms: cstage's gates inline `if (t->kind == TY_NAMED)
t = t->under` at every callsite (cgreturn, cglet sizing, cgexpr
N_DOT, cgassign N_DOT, cg_sret_retsize) — graduated to a
while-loop via new type_chase_named helper across 11 sites.
wwstage routes all field-walks through structlookup, which
registers only direct struct definitions (not aliases) — missing
the alias-recurse fallback. New structlookupchain helper mirrors
slotsize's N_TARRAY arm precedent; sretretsize + 4 cgenexpr.ww
sites route through it. Splitting would either land cstage
without unblocking wwstage's strings.tokenize wrapper shape
(rule 10 byte-id regression) or land wwstage without cstage
gate parity (breaking 995 self-rebuild). 756 sentinel exercises
4 rows × cstage RC + wwstage RC + byte-id = 12 fixtures; pre-fix
rows 2 + 4 (slice-fields single alias, i32 double alias) fail
on both RC and byte-id. The ~67 cstage / ~26 wwstage candidate
sibling sites are #17-style structural-close follow-up; this
commit fixes the immediate strings.tokenize-wrapper blockers.
This commit is contained in:
Hojun-Cho
2026-05-19 15:09:57 +09:00
parent 7e1b681701
commit a1d9f36d11
7 changed files with 513 additions and 40 deletions
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23
selfhost/cmd/wcc/cgenexpr.ww
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@@ -1280,7 +1280,11 @@ fn cgdot(c: *cgen, n: *node) void = {
};
};
if (sname.len > 0) {
let si: *structinfo = structlookup(c, sname);
// structlookupchain walks the alias chain on
// a miss so `*tokenizer` where tokenizer is
// a transitively-aliased struct still
// resolves to the underlying fieldinfo (#22).
let si: *structinfo = structlookupchain(c, inner);
if (si != nil) {
let fi: *fieldinfo = si.fields;
for (fi != nil) {
@@ -1363,8 +1367,11 @@ fn cgdot(c: *cgen, n: *node) void = {
};
// Direct struct local: field load at off+foff.
if (lkind == nkind.N_TNAME) {
let sname: str = tn.str;
let si: *structinfo = structlookup(c, sname);
// structlookupchain walks the alias chain on
// miss so a transitively-aliased struct (`type
// b = a; a = struct`) still resolves to the
// underlying fieldinfo (#22).
let si: *structinfo = structlookupchain(c, tn);
if (si != nil) {
let fi: *fieldinfo = si.fields;
for (fi != nil) {
@@ -4029,7 +4036,10 @@ fn cgassign(c: *cgen, n: *node) void = {
if (inner.kind == nkind.N_TNAME) { sname = inner.str; };
};
if (sname.len > 0) {
let si: *structinfo = structlookup(c, sname);
// structlookupchain (#22) handles the
// alias-chain miss; same shape as the
// cgdot pointer-to-struct read site.
let si: *structinfo = structlookupchain(c, inner);
if (si != nil) {
let fi: *fieldinfo = si.fields;
for (fi != nil) {
@@ -4267,8 +4277,9 @@ fn cgassign(c: *cgen, n: *node) void = {
};
// Direct struct local: store at off+foff.
if (lkind == nkind.N_TNAME) {
let sname: str = tn.str;
let si: *structinfo = structlookup(c, sname);
// structlookupchain (#22) — same shape
// as the cgdot direct-local read site.
let si: *structinfo = structlookupchain(c, tn);
if (si != nil) {
let fi: *fieldinfo = si.fields;
for (fi != nil) {