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w6c: fold dot chains through inferred-alloc struct pointers (#24 residue)

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wwstage dotchainresolve gated its *T roots on an N_TPTR-over-N_TNAME
tnode; an inferred `let p = alloc(S{...})!` rides the checker-
SYNTHESIZED N_TPTR whose pointee is the struct BODY node (the #24
TNAME-normalize covers only the direct struct-lit binding), so the
root gate failed and chained p.field.pseudo reads fell to the
unfused deref arms — shape-only divergence vs cstage's type-keyed
fold (both stages runtime-correct; the historical field(SB) leak the
pin described was already fixed). Widen the local and global root
gates to accept the N_TSTRUCT pointee; correctness stays enforced by
the stamped-tinfo peel below (TY_PTR -> pointee TY_STRUCT).

Graduates alias_g73_heapfill out of DATABYTEID_DIVERGED (2 pins
remain, both the tagged-spill family); adds compile fixtures pinning
the newly-converged siblings (nested read+store, slice .cap,
inferred-global root; pin 1730/22/3460) and a runtime lang row that
mutates then re-points the heap base — a read bypassing the pointer
returns the wrong len.
This commit is contained in:
Hojun-Cho
2026-08-08 17:14:59 +09:00
parent 7631f4327c
commit d78137a051
8 changed files with 79 additions and 14 deletions
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16
selfhost/cmd/wcc/cgenutil.ww
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@@ -5403,11 +5403,20 @@ export fn dotchainresolve(c: *cgen, n: *syntax.node,
// `*T` root (param/local): dereference at emit time;
// pointee struct supplies the field layout. Callers
// that opt in via *outptrroot emit a MOVQ load of the
// slot before indexing.
// slot before indexing. N_TSTRUCT pointee: an inferred
// `let p = alloc(S{...})!` rides the checker-synthesized
// N_TPTR whose pointee is the struct BODY node (the #24
// TNAME-normalize covers only the direct struct-lit
// binding); correctness is enforced by the stamped-tinfo
// peel below (TY_PTR → pointee TY_STRUCT), mirroring
// cstage's type-keyed root gate (cgen.c cg N_DOT
// chained-spine ptr_root) — this kind check is only a
// shape filter.
if (lc.tnode.kind == syntax.nkind.N_TPTR) {
let pe: *syntax.node = lc.tnode.lhs;
if (pe != nil) {
if (pe.kind == syntax.nkind.N_TNAME) {
if (pe.kind == syntax.nkind.N_TNAME
|| pe.kind == syntax.nkind.N_TSTRUCT) {
*outrootoff = lc.off;
*outptrroot = true;
resolved = true;
@@ -5429,7 +5438,8 @@ export fn dotchainresolve(c: *cgen, n: *syntax.node,
if (gtn.kind == syntax.nkind.N_TPTR) {
let pe: *syntax.node = gtn.lhs;
if (pe != nil) {
if (pe.kind == syntax.nkind.N_TNAME) {
if (pe.kind == syntax.nkind.N_TNAME
|| pe.kind == syntax.nkind.N_TSTRUCT) {
*outisglobal = true;
*outptrroot = true;
resolved = true;