Files
sx/examples/1301-ffi-objc-class.sx
agra 12bf61a9fc std: restructure step 3 — ffi/ moves, build.sx, math dir spelling, fixtures
- objc.sx, objc_block.sx (from std/) + sdl3/opengl/raylib/stb/stb_truetype/
  wasm vendor bindings (from modules/ root) -> modules/ffi/
- std/uikit.sx deleted: platform/uikit.sx already declares UIApplicationMain
  and imports objc; '#framework "UIKit"' cannot live in a file imported on
  macOS targets (unconditional link directive, UIKit is iOS-only), so the
  three iOS-only examples carry the 3-line glue inline. 1607/1608/1616 also
  un-rotted (dead ns_string -> 'xx "..."' Into conversions, callconv(.c)
  msgSend fn-ptrs) — all three build for ios-sim/ios again.
- math/math.sx -> math/scalar.sx; one spelling '#import "modules/math"'
  everywhere (4 pinned IR snapshots regenerated: dir import adds Vec2/Mat4
  to the type tables).
- compiler.sx -> build.sx (imports, CLAUDE.md bundling table, specs.md).
- testpkg/ + test_c.sx -> tests/fixtures/ (resolve CWD-relative from repo
  root, same as vendors/).
- library-internal imports use full modules/... paths (std.sx tail,
  platform/bundle.sx, fixtures).
2026-06-11 08:37:22 +03:00

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// Register a brand-new Obj-C class from sx and prove a sx-defined method
// actually runs when dispatched through `objc_msgSend`.
//
// The flow:
// 1. `objc_allocateClassPair(NSObject, "SxThing", 0)` returns an unregistered Class.
// 2. `class_addMethod(cls, sel_hello, IMP, "v@:")` attaches our sx function as
// the `hello` method (type encoding "v@:" = void method(id self, SEL _cmd)).
// 3. `objc_registerClassPair(cls)` finalizes it.
// 4. `class_createInstance(cls, 0)` returns an `id` for a fresh instance.
// 5. typed-cast `objc_msgSend` for `void (id, SEL)` and dispatch `hello`.
// If the IMP ran, the global `g_marker` is non-zero and we return it as exit.
#import "modules/std.sx";
#import "modules/ffi/objc.sx";
g_marker : s32 = 0;
// IMP for `hello`. Must use C calling convention so `self` and `_cmd` land in
// x0 and x1 the way the Obj-C runtime expects.
hello_imp :: (self: *void, _cmd: *void) callconv(.c) {
g_marker = 42;
}
main :: () -> s32 {
NSObject := objc_getClass("NSObject".ptr);
SxThing := objc_allocateClassPair(NSObject, "SxThing".ptr, 0);
sel_hello := sel_registerName("hello".ptr);
ok := class_addMethod(SxThing, sel_hello, xx hello_imp, "v@:".ptr);
if !ok { return 1; }
objc_registerClassPair(SxThing);
obj := class_createInstance(SxThing, 0);
if obj == xx 0 { return 2; }
// [obj hello]
msg : (*void, *void) -> void callconv(.c) = xx objc_msgSend;
msg(obj, sel_hello);
return g_marker; // 42 if hello_imp ran
}