wcc: address-of symbol-bearing def + cross-module module-qual (#149)
Widen cgaddr / N_UN TK_AMP for addressable globals — the address-of
twin of A.2/A.3's value-LOAD widening (which covered cgexpr N_DOT /
cgindex but never the &-path, so &<mod>.<def> emitted uninitialized-AX
garbage). Two shapes, one class:
- Shape 1 (&G, N_IDENT def): LEAQ masym(G) for struct/array/scalar
defs. Scalar gate = emit_defs/emit_floatlit_data eligibility exactly
(fold_int_literal OR rhs-peels-to-N_FLOATLIT) so the addressable set
equals the symbol-bearing set — never LEAQs a missing symbol. Reuses
DefStruct/DefArray registries (A.2/A.3); new def_isscalardef/DefAny.
- Shape 2 (&mod.G, N_DOT module-qual): LEAQ leaf (TY_FN -> mafn),
mirroring the value-READ resolution (cgen.c:6043). Kind-agnostic —
fixes &mod.def, &mod.let, &mod.scalar, &mod.func. This is fold-4's
&math.f64info pattern.
Non-addressable def (str-def, computed-float-def) -> loud error both
stages; upgrades #147 &NAN(0.0/0.0) from silent wild-deref to loud
compile error. Computed-float-def symbol emission split to #147
(needs float-const-fold; not needed by gamma/fold-4). wwstage Shape-2
gate carries !deflookup so a def base routes to silent-drop matching
cstage's type-gate (rule-10 parity).
Unblocks gamma-cleanup (#40) + strconv fold-4 (&math.f64info).
Bootstrap-NEUTRAL (no &global in lib/selfhost; only &local). Test 921
(12 rows: same-pkg struct/array/scalar-int/scalar-float + cross-pkg
def_struct/let_struct/scalar_let/func + regression &let/&arr[i] +
2 loud-reject). Make test: 184/184 incl 990-997 byte-id +
combined_ww_fresh.
Followups: #147 (computed-float-def symbol), #152/#153 (pre-existing
ptr-param element read divergences, dodged by 921), #154 (address-of
def subparts &def.field/&def_array[i]).
Hojun-Cho
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