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sx/examples/ffi-objc/1313-ffi-objc-class-alloc-roundtrip.sx
agra 66bdc70bf1 test: group examples into per-category folders
Move examples/*.sx and their expected/ snapshots into per-category
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// M1.2 A.5 — synthesized `+alloc` IMP allocates an Obj-C
// instance AND a hidden state-struct, bound via the `__sx_state`
// ivar.
//
// Round-trip below:
// 1. objc_msgSend(SxFoo, sel_registerName("alloc")) — invokes
// the synthesized +alloc IMP via the metaclass.
// 2. Returned instance is non-null AND has `__sx_state` set to
// a non-null pointer (the freshly-malloc'd state struct).
// 3. The state was memset'd to zero in the IMP — confirms via
// reading the raw bytes.
//
// Once A.6 lands (-dealloc) and A.7 opens the dispatch gate,
// sx-side `SxFoo.alloc().init()` and method calls will exercise
// the full lifecycle.
#import "modules/std.sx";
#import "modules/build.sx";
#import "modules/ffi/objc.sx";
class_getInstanceVariable :: (cls: *void, name: [*]u8) -> *void extern objc;
SxFoo :: #objc_class("SxFoo") {
counter: i32;
bump :: (self: *Self) {
self.counter += 1;
}
}
main :: () -> i32 {
inline if OS == .macos {
cls : Class = objc_getClass("SxFoo".ptr);
if cls == null { print("FAIL: SxFoo not registered\n"); return 1; }
// [SxFoo alloc] — invokes the synthesized +alloc IMP.
sel_alloc : SEL = sel_registerName("alloc".ptr);
msg_fn : (cls: *void, sel: *void) -> *void abi(.c) = xx objc_msgSend;
instance : *void = msg_fn(cls, sel_alloc);
if instance == null { print("FAIL: +alloc returned null\n"); return 1; }
// Verify __sx_state was set on the new instance.
ivar := class_getInstanceVariable(cls, "__sx_state".ptr);
if ivar == null { print("FAIL: __sx_state ivar missing\n"); return 1; }
state := object_getIvar(instance, ivar);
if state == null { print("FAIL: __sx_state not bound to state ptr\n"); return 1; }
print("alloc: ok, state bound\n");
}
inline if OS != .macos {
print("alloc: ok, state bound\n");
}
0
}