agra 5c1d00a877 ffi M4.B helpers: objcPropertyKind + ARC runtime decls + xfail tests ...

Three pieces, no behavior change yet:

1. `ObjcPropertyKind` enum (strong/weak/copy/assign) + `objcPropertyKind`
   helper in lower.zig. Reads `field.property_modifiers`, applies the
   default rule (`*<ObjC-class>` → strong; primitives → assign), and
   emits loud diagnostics for the silent-error budget:
   - unknown modifier name (typo) → "expected one of: strong, weak, copy, ..."
   - conflicting modifiers (e.g. `strong,weak`) → "mutually exclusive"
   - `weak` on non-object slot → "requires a pointer-to-Obj-C-class type"
   - `copy` on non-object slot → same
   - `strong` (default or explicit) on `*void` → "ambiguous: specify
     #property(strong|weak|copy|assign) explicitly"
   Called from `emitObjcDefinedClassPropertyImps` for validation; the
   returned kind isn't wired into setter/getter/dealloc yet — that's
   the next three commits.

2. `ensureArcRuntimeDecls` lazily declares libobjc's ARC helpers:
   objc_retain, objc_release, objc_storeWeak, objc_loadWeakRetained,
   objc_initWeak, objc_destroyWeak. Uses the existing
   `ensureCRuntimeDecl` pattern; idempotent.

3. Fix existing NSObject method names in std/objc.sx — `isEqual_`,
   `isKindOfClass_`, `respondsToSelector_` had trailing underscores
   that the selector mangling turned into double-colon selectors
   (`isEqual::`). Removed the trailing underscore so the selectors
   come out as `isEqual:`, `isKindOfClass:`, `respondsToSelector:`
   as Apple's runtime expects.

4. Two xfail regression tests:
   - ffi-objc-arc-02-strong-property: assigns child to parent's strong
     property, releases the original child reference. Midpoint check:
     child's dealloc should NOT have fired (strong setter retained).
     Pre-M4.B-setter: child dealloc fires immediately → "FAIL: child
     dealloc'd at midpoint" snapshot. Exit code 1.
   - ffi-objc-arc-03-weak-property: assigns target to holder's weak
     property, releases target. Reads holder.target → should be null
     (auto-niled). Pre-M4.B-getter/setter: reads stale pointer →
     "FAIL: weak property didn't auto-nil" snapshot.

These will turn green as M4.B setter (commit 2), getter (commit 3),
and dealloc-cleanup (commit 4) land. Each subsequent commit updates
the snapshot to reflect the now-passing output.

189/189 example tests pass; chess on iOS-sim green.

2026-05-26 22:58:30 +03:00

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