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wcc_ww/cgen: #60+#79 alias-NAMED array/slice ELEMENT paths read the chased tinfo — tichase lands, SEGV families graduate byte-id

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One class: alias-blind base+esz at the array/slice ELEMENT paths —
index read/write, slice-expr, for-range, and literal-init store. The
wwstage cgen derived element size and base addressing from the
type-AST tnode; an alias-typed base (`type arr = [4]int; let a: arr`)
shows only the N_TNAME leaf, so esz fell to a sentinel (1 on the read
side, 8 on the init-store side) and the base classified as a POINTER
(MOVQ of array words, no IMULQ): m8b_idx1/range1 SEGV 139, m8b_slice1
silent-wrong past little-endian prefix-luck (m8c_slice1big exit 2),
m7c global [2]row read SEGV via the alias-blind element-is-array
classify, and (#79, ken F2a1 oracle) `type A=[4]u32; let a:A=[...]`
stored MOVQ stride-8 over a stride-4 slot — elements 2/3 landed at
0(BP)/+8(BP), a saved-BP/RIP smash masked whenever esz==8. cstage
reads everything off the chased stamped type (type_chase_named/
idx_eff, correct post-F1), so every fixed shape graduates
ww-SEGV/silent-wrong -> 0/0 byte-id.

New tichase() in cgenutil.ww: nil-passthrough transitive TY_NAMED
peel, exact twin of cmd/wcc/type.c:160-162. Routed sites, all gated on
the stamped type being TY_NAMED (non-alias paths byte-identical):

- cgindex (cgenexpr.ww): elem facts (esz/signed/float/f32) off
  tichase(n.type_); etn falls back to n for the tagged/str/slice
  classify; LEAQ-vs-MOVQ base off the chased kind; elem-is-array
  supplemented by tinfoisarray(n.type_) for alias ELEMENTS (m7c).
- cgassign N_INDEX store + compound arms (cgenexpr.ww): esz +
  elemtn=lhs (the stamped-element idiom of the N_DOT/N_INDEX arms);
  chased-kind base classify at all four LEAQ/MOVQ sites.
- cgslice + cgbasecap (cgenexpr.ww): esz, base classify, default-hi
  (TY_ARRAY -> $alen / TY_SLICE|TY_STR -> +8 len), cap word at +16;
  global-str cap keeps the #73 carve-out.
- cgforrange (cgenstmt.ww, cross-file leg: the range pin cannot green
  without it): esz, element-node synthesis off .sub (FC0 precedent),
  isarr/isslicestr classify, alen off the chased tinfo.
- cgarrlitfillbp (cgenstmt.ww, #79): an alias [count]T arrtn is the
  N_TNAME leaf (elemn nil) — synthesise the element node off the
  chased sub so the existing prim/agg/slice/tagged/narrow dispatch
  works unchanged; `...` repeat bound off the chased alen (cstage
  cg_arrlit_fill_bp receives the pre-chased bu and reads bu->alen).
  #8-PAIR COVERAGE: this is the STORE half of #8's two size-sources.
  The elemsizeofc READ half chases the ELEMENT internally (idxeffti +
  esub peel, the #8 fix) but NOT an alias-typed INDEXABLE node — that
  leg is covered at its #60-family call sites by the gates above
  (cgindex/cgslice/store/compound/cgforrange/pusharg). Remaining
  alias-blind elemsizeofc callers are enumerated as residuals below.
- bare-let classify (cgenstmt.ww, #79 rider): `let a: arrk;` with an
  alias-to-array type took the composite zero-fill cstage doesn't
  emit (cstage keys the no-init shape on the chased lu->kind: arrays
  keep the per-index-write contract; an 8B alias-array still falls to
  the single MOVQ $0 arm). Required for the loopfill_1024 pin's
  byte-id; closes the array kind of the uninit-alias divergence.
- pusharg N_SLICE (cgenutil.ww, pulled in by the same pin rule: the
  944 slice_of_alias_arg row is a distinct lowering from cgslice):
  esz, base classify, default-hi.

Tests: new 944_alias_idx_family_run (19 rows: idx/slice/range/init
controls + 1-level + 2-level + decl-order permutations + index store
+ compound (+=, *=) + #79 [4]u32 literal-init + alias `[v...]` repeat
+ uninit [1024] loop-fill + slice1big (1000 elems, values >255,
LAST-element readback, default-hi, .cap, range count) + re-slice of an
alias slice + range over an alias slice + m7c global 2D + GLOBAL
alias-slice indexed read + slice-as-call-arg; dual-stage run +
per-row byte-id; LAST elements asserted throughout). The six
944_alias_accept_run rows citing "#60 (F2 batch 1)" flip K_RUN_CS ->
K_RUN (incl. slicefield_wholeread_2lvl: its 738d7f4-era receive-spine
divergence no longer reproduces at the F1-merged base, verified
byte-id + 0/0). 989_lib_byteid checked: no DIVERGE entry graduates
(the test fails loudly on graduation; lib has no alias-base consumers
— the shape SEGVed before this fix).

NOT pinned (g-fold territory, #77/#78): direct alias-typed global
ARRAY rows. Expected state probe-verified UNCHANGED by this diff:
`let g: arr = [...]` -> ww link-ERR (no DATA emitted), cs 1-level
runs 0, cs 2-level runs WRONG (silent). The alias-GLOBAL base legs
added here (isglobalarr reclassify, global default-hi/cap) are
cs-aligned but runtime-unreachable until the DATA emit lands.

Residuals filed with the team: alias-blind elemsizeofc callers not in
the #60 pin family — cgun &a[i] addr-of (cgenexpr.ww:4638 region,
task #82), append() on an alias-typed slice local (:5287),
`alloc([], n)` into an alias-slice let (cgenstmt.ww:2159),
arr[i].field= float store (:8536); tagged-element READ under an
alias base keeps the ident-arm nullable semantics; checker
asserttyped on `untyped_lit * rangevar` over an alias slice
(pre-existing, check.ww is batch 4, task #80); uninit alias-to-STRUCT
zero-fill unchanged (correct: cstage fills composites);
range-destructure over alias-to-tuple-slice.

selfhost/cmd/{w6c,wwdump}/main.combined.ww regenerated (cgen*.ww are
embedded sources).
This commit is contained in:
Hojun-Cho
2026-06-05 19:38:54 +09:00
parent ac63951d54
commit da81a4c86e
8 changed files with 1727 additions and 50 deletions
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32
test/wcc/944_alias_accept_run.c
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@@ -28,17 +28,15 @@
* idx/slice/range_ | index/slice/for-range over 2-level |
* 2level, slice_arg | alias bases (F0 8b) — cs cgen index |
* | family chased (idx_eff + base |
* | classify); CS-ONLY rows: the wwstage |
* | half is the task-#60 esz family (F2 |
* | batch 1) — flip to K_RUN when it |
* | lands | 0(cs)
* | classify); ww half landed (#60, F2a |
* | batch 1 tichase) — graduated K_RUN | 0
* arg_2level_* | task #61: alias-NAMED struct PARAM |
* | classify (fwd-ref / lit-init / 40B |
* | 5-eightbyte / f64 SSE class legs + |
* | base control) | 0
* float_alias_param* / | ken-v3 leg: 2-level f64/str/slice |
* str_alias_2level / | aliases at the cgen KIND classifiers |
* slice_alias_param | (slice leg cs-only, #60) | 0
* slice_alias_param | (slice leg graduated, #60 F2a b1) | 0
* slicefield_* / | reviewer-F1 leg: 2-level alias of |
* strfield_store_2lvl | slice/str as a STRUCT FIELD type — |
* | cgen field gates chased (stores, |
@@ -424,11 +422,11 @@ static const struct row rows[] = {
" return 0;\n"
"};\n", 0, K_RUN, NULL },
/* whole-field read into a local: cs runtime-correct post-chase
* (the clobbered-register r1b probe), but the `let w = b.s`
* receive spine diverges cs vs ww at ONE level already (byte-id
* NO at pristine 738d7f4 = pre-existing, #71-style divergence,
* filed under #73's census) and ww's `w[i]` read is the task-#60
* esz family — cs-only until both land. */
* (the clobbered-register r1b probe). The `let w = b.s` receive
* spine divergence noted at pristine 738d7f4 no longer
* reproduces at the F1-merged base, and ww's `w[i]` read (the
* task-#60 esz half) landed in F2a batch 1 — byte-id + 0/0
* verified, graduated K_RUN. */
{ "slicefield_wholeread_2lvl",
"package main;\n"
"type sl = []int;\n"
@@ -447,7 +445,7 @@ static const struct row rows[] = {
" if (w.len != 3) { return 1; };\n"
" if (w[2] != 900) { return 2; };\n"
" return 0;\n"
"};\n", 0, K_RUN_CS, NULL }, /* ww: task #60 (F2 batch 1) */
"};\n", 0, K_RUN, NULL }, /* graduated: #60 (F2a batch 1) */
/* #73 tripwire pin: the UNPROBED single-peel field gates
* (indexed-elem store/read, ptr-chain read, heap fill, tuple-elem
* read, static emit) hard-error on a 2+-level alias over an
@@ -479,7 +477,7 @@ static const struct row rows[] = {
" a[1] = 9999;\n"
" if (a[1] != 9999) { return 2; };\n"
" return 0;\n"
"};\n", 0, K_RUN_CS, NULL }, /* ww: task #60 (F2 batch 1) */
"};\n", 0, K_RUN, NULL }, /* graduated: #60 (F2a batch 1) */
{ "slice_2level",
"package main;\n"
"type sl = []int;\n"
@@ -492,7 +490,7 @@ static const struct row rows[] = {
" s[1] = 7777;\n"
" if (a[2] != 7777) { return 3; };\n"
" return 0;\n"
"};\n", 0, K_RUN_CS, NULL }, /* ww: task #60 (F2 batch 1) */
"};\n", 0, K_RUN, NULL }, /* graduated: #60 (F2a batch 1) */
{ "range_2level",
"package main;\n"
"type arr = [4]int;\n"
@@ -505,7 +503,7 @@ static const struct row rows[] = {
" };\n"
" if (sum != 10) { return 1; };\n"
" return 0;\n"
"};\n", 0, K_RUN_CS, NULL }, /* ww: task #60 (F2 batch 1) */
"};\n", 0, K_RUN, NULL }, /* graduated: #60 (F2a batch 1) */
{ "slice_of_alias_arg",
"package main;\n"
"type arr = [4]int;\n"
@@ -522,7 +520,7 @@ static const struct row rows[] = {
" if (s[1] != 3000) { return 2; };\n"
" if (sum(a[0:4]) != 10000) { return 3; };\n"
" return 0;\n"
"};\n", 0, K_RUN_CS, NULL }, /* ww: task #60 (F2 batch 1) */
"};\n", 0, K_RUN, NULL }, /* graduated: #60 (F2a batch 1) */
/* ---- ken-v3 leg: the acceptance align above opens 2-level
* float/str/slice aliases to the cgen KIND classifiers
* (cg_isfloat/type_isf32/fld_isfloat/type_isstr/type_isslice),
@@ -570,7 +568,7 @@ static const struct row rows[] = {
" return 0;\n"
"};\n", 0, K_RUN, NULL },
/* slice leg: cs classify fixed; the ww half of the indexed read
* is the task-#60 esz family — cs-only until F2. Values >255
* (task-#60 esz family) landed in F2a batch 1. Values >255
* break the esz=1 prefix-luck. */
{ "slice_alias_param",
"package main;\n"
@@ -584,7 +582,7 @@ static const struct row rows[] = {
" let s: b2 = a[0:3];\n"
" if (first(s) != 1000) { return 1; };\n"
" return 0;\n"
"};\n", 0, K_RUN_CS, NULL }, /* ww: task #60 (F2 batch 1) */
"};\n", 0, K_RUN, NULL }, /* graduated: #60 (F2a batch 1) */
/* ---- task #61: cstage alias-NAMED struct PARAM classify.
* The single peel classified a 2-level-alias param SCALAR: caller
* pushed and callee spilled ONE eightbyte, fields read saved-BP/