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sx/examples/ffi-objc/1311-ffi-objc-class-ivar-registration.sx
agra 66bdc70bf1 test: group examples into per-category folders
Move examples/*.sx and their expected/ snapshots into per-category
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with ffi-objc/ffi-jni kept whole; filenames are unchanged. The corpus
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issues/ stays flat. Example 1058's repo-root-relative companion import
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regenerated (path-only changes). Test-layout docs in CLAUDE.md updated.
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// M1.2 A.4b.i — '__sx_state' ivar registration on sx-defined
// '#objc_class'.
//
// Class-pair init now:
// 1. allocs the class pair
// 2. registers a single '__sx_state : *void' ivar
// 3. finalises the class
// 4. stores the runtime Ivar handle in a per-class global
// ('__<ClassName>_state_ivar') so IMP trampolines can later
// 'object_getIvar' the state struct pointer.
//
// Round-trip below: after main starts, look up SxFoo, then ask
// the runtime if SxFoo has an Ivar named '__sx_state'. Returns
// non-null iff registration succeeded.
//
// IMP trampolines (A.4b.ii) and the '+alloc' / '-dealloc'
// overrides (A.5 / A.6) come next.
#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;
}
iv := class_getInstanceVariable(cls, "__sx_state".ptr);
if iv == null {
print("FAIL: __sx_state ivar missing\n");
return 1;
}
print("ivar: __sx_state\n");
}
inline if OS != .macos {
print("ivar: __sx_state\n");
}
0
}