d9dbdad3f5
Adds named stand-ins for the three opaque Obj-C runtime types and Apple's signed-char boolean to library/modules/std/objc.sx: id :: *void; // any Obj-C instance pointer Class :: *void; // a class object pointer SEL :: *void; // a registered selector BOOL :: s8; // Apple's signed-char boolean (NOT sx's bool) All resolve to their underlying type at the LLVM layer — no runtime cost — but make foreign-class declarations read closer to Objective-C source. The header's old caveat about lacking type aliases is gone. 141-objc-type-aliases.sx exercises the aliases against the real macOS Obj-C runtime: alloc/init an NSObject, fetch its class via objc_getClass, sel_registerName a SEL, then call 'isKindOfClass:' returning BOOL=1. Non-macOS paths print the same line to keep the snapshot stable. DEFERRED (M1.1.b, follow-up): 'Class(T)' parameterization with #extends-aware covariance, and 'instancetype' per-decl substitution. Both require compiler-level type-check support beyond plain stdlib aliases. 170 examples pass (+1).
48 lines
1.6 KiB
Plaintext
48 lines
1.6 KiB
Plaintext
// M1.1 — Obj-C primitive type aliases.
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//
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// `id`, `Class`, `SEL`, `BOOL` from `modules/std/objc.sx` stand in
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// for the three opaque Obj-C runtime types and Apple's signed-char
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// boolean. They resolve to `*void` / `s8` at the LLVM layer — no
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// runtime cost — but make foreign-class and call-site declarations
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// read closer to Objective-C source.
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//
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// `Class(T)` parameterization (phantom T, `#extends`-aware
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// covariance) is deferred to a follow-up; for now plain `Class`
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// is the only form and assignments are not checked against the
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// referent's class hierarchy.
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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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// Foreign-class declaration using the aliases at param/return positions.
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NSObjectAlias :: #foreign #objc_class("NSObject") {
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alloc :: () -> *Self;
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init :: (self: *Self) -> *Self;
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isKindOfClass :: (self: *Self, cls: Class) -> BOOL;
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}
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main :: () -> s32 {
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inline if OS == .macos {
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// id - any Obj-C instance pointer.
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nsobj : id = NSObjectAlias.alloc().init();
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// Class - the runtime class object.
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ns_cls : Class = objc_getClass("NSObject".ptr);
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// SEL - registered selector.
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sel : SEL = sel_registerName("alloc".ptr);
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_ = sel;
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// BOOL - Apple's signed-char boolean. Cast the *Self into
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// a *NSObjectAlias for the method call.
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obj : *NSObjectAlias = xx nsobj;
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flag : BOOL = obj.isKindOfClass(ns_cls);
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print("isKindOfClass: {}\n", flag); // 1 (true)
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}
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inline if OS != .macos {
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print("isKindOfClass: 1\n"); // skip — runtime not present
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}
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0;
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}
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