c2178c062b
Class-pair init constructor now registers a single hidden ivar on each sx-defined class: class_addIvar(cls, "__sx_state", 8, 3, "^v") before objc_registerClassPair. After the class is registered, the constructor calls class_getInstanceVariable to fetch the runtime Ivar handle and stores it in a per-class global '__<ClassName>_state_ivar : *void'. Trampolines (A.4b.ii) will read this global to 'object_getIvar' the state struct pointer. lower.zig declares the per-class global at scan time (declareObjcDefinedStateIvarGlobal) so emit_llvm finds it by name when populating. Encoding '^v' = void* (a generic pointer — the runtime treats it as opaque storage). log2 alignment = 3 for 8-byte pointer alignment on 64-bit. 144-objc-class-ivar-registration.sx exercises the round-trip: after main starts, class_getInstanceVariable(SxFoo, "__sx_state") returns non-null. Runs against the real Obj-C runtime on macOS. 142's IR snapshot refreshed to include the new constructor body (class_addIvar + class_getInstanceVariable + ivar-global store). 173 example tests pass (+1 from 144). zig build test green.
52 lines
1.4 KiB
Plaintext
52 lines
1.4 KiB
Plaintext
// M1.2 A.4b.i — '__sx_state' ivar registration on sx-defined
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// '#objc_class'.
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//
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// Class-pair init now:
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// 1. allocs the class pair
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// 2. registers a single '__sx_state : *void' ivar
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// 3. finalises the class
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// 4. stores the runtime Ivar handle in a per-class global
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// ('__<ClassName>_state_ivar') so IMP trampolines can later
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// 'object_getIvar' the state struct pointer.
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//
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// Round-trip below: after main starts, look up SxFoo, then ask
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// the runtime if SxFoo has an Ivar named '__sx_state'. Returns
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// non-null iff registration succeeded.
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//
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// IMP trampolines (A.4b.ii) and the '+alloc' / '-dealloc'
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// overrides (A.5 / A.6) come next.
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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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class_getInstanceVariable :: (cls: *void, name: [*]u8) -> *void #foreign objc;
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SxFoo :: #objc_class("SxFoo") {
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counter: s32;
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bump :: (self: *Self) {
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self.counter += 1;
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}
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}
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main :: () -> s32 {
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inline if OS == .macos {
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cls : Class = objc_getClass("SxFoo".ptr);
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if cls == null {
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print("FAIL: SxFoo not registered\n");
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return 1;
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}
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iv := class_getInstanceVariable(cls, "__sx_state".ptr);
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if iv == null {
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print("FAIL: __sx_state ivar missing\n");
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return 1;
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}
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print("ivar: __sx_state\n");
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}
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inline if OS != .macos {
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print("ivar: __sx_state\n");
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}
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0;
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}
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