0ac5ba2ccd
Adds a special case to lowerFieldAccess: when the field is
literally 'class' and the receiver is a pointer to an Obj-C
(or Obj-C protocol) foreign-class struct, emit
'object_getClass(obj)' instead of falling through to struct GEP.
Returns 'Class' (the M1.1 first-pass alias for *void;
parameterized Class(T) covariance is deferred to M1.1.b).
f := SxFoo.alloc();
cls := f.class; // → object_getClass(f)
cls == objc_getClass("SxFoo".ptr); // ok
New helper isObjcClassPointer(ty) detects 'ptr -> struct in
foreign_class_map under .objc_class / .objc_protocol'. The
check fires BEFORE the auto-deref so the runtime call sees the
opaque Obj-C pointer rather than the load'd struct stub.
148-objc-self-class-accessor.sx exercises both shapes end-to-end
against the macOS runtime: sx-defined class (SxFoo) and foreign
class (NSObject). Round-trips against objc_getClass(name).
178 example tests pass. zig build test green.
This effectively closes Month 1 — M1.0, M1.1 (first pass), M1.2,
M1.3 all done. Remaining: M1.1.b (Class(T) covariance +
instancetype), then Month 2 (declarative sugar).
49 lines
1.5 KiB
Plaintext
49 lines
1.5 KiB
Plaintext
// M1.3 — `obj.class` accessor on Obj-C pointers.
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//
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// Any Obj-C-class pointer (foreign or sx-defined) can be probed
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// for its runtime class object via `obj.class`. Lowers to
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// `object_getClass(obj)`. Returns `Class` (alias for *void —
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// parameterized `Class(T)` covariance is M1.1.b).
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//
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// Verifies both shapes:
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// 1. (*SxFoo).class — sx-defined class. Returns the SxFoo Class.
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// 2. (*NSObject).class — foreign class via stdlib. Returns NSObject's
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// Class.
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#import "modules/std.sx";
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#import "modules/compiler.sx";
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#import "modules/std/objc.sx";
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NSObjectFwd :: #foreign #objc_class("NSObject") {
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alloc :: () -> *NSObjectFwd;
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init :: (self: *NSObjectFwd) -> *NSObjectFwd;
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}
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SxFoo :: #objc_class("SxFoo") {
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counter: s32;
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alloc :: () -> *SxFoo;
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bump :: (self: *Self) { self.counter += 1; }
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}
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main :: () -> s32 {
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inline if OS == .macos {
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// sx-defined class round-trip.
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f := SxFoo.alloc();
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cls_f : Class = f.class;
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expected_f : Class = objc_getClass("SxFoo".ptr);
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if cls_f != expected_f { print("FAIL: SxFoo.class mismatch\n"); return 1; }
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// foreign class round-trip.
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nso := NSObjectFwd.alloc().init();
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cls_n : Class = nso.class;
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expected_n : Class = objc_getClass("NSObject".ptr);
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if cls_n != expected_n { print("FAIL: NSObject.class mismatch\n"); return 1; }
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print("class accessor: ok\n");
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}
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inline if OS != .macos {
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print("class accessor: ok\n");
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}
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0;
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}
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