e52f9f275e
Closes the runtime-verification gap from cluster 1.28: chess startup doesn't reach the keyboard `becomeFirstResponder` / `resignFirstResponder` path, so `#objc_call(bool)` was only compile-verified. This example installs two BOOL-returning IMPs via `class_addMethod` (type encoding "B@:") and dispatches both through `#objc_call(bool)`. Also exercises the nil-receiver guarantee (libobjc returns a zero slot, which decodes as false). This is a test-add commit (per the FFI cadence rule): it locks in current behavior without changing any lowering. Lowering shape is identical to `#objc_call(u8)` at the ABI layer; this test makes the source-level type explicit and gives `git bisect` a target if a future emit_llvm change inadvertently breaks single-byte returns. 110/110 host tests pass.
49 lines
1.9 KiB
Plaintext
49 lines
1.9 KiB
Plaintext
// Backfill for Phase 1D cluster 1.28 (PLAN-FFI.md): `#objc_call(bool)`
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// against `BOOL`-returning selectors. Obj-C `BOOL` is single-byte on
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// every Apple ABI we ship to (signed char on i386, native `bool` on
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// arm64), so the slot shape is identical to `#objc_call(u8)` — this
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// test is about the source-level type being meaningful, not a
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// distinct ABI path.
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//
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// Two IMPs are installed: `yes_imp` returns true, `no_imp` returns
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// false. Both are dispatched through `#objc_call(bool)` and the
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// results are checked.
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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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yes_imp :: (self: *void, _cmd: *void) -> bool callconv(.c) { true; }
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no_imp :: (self: *void, _cmd: *void) -> bool callconv(.c) { false; }
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main :: () -> s32 {
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inline if OS == .macos {
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// Nil-recv: libobjc returns a zeroed slot, which decodes as false.
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nil_b := #objc_call(bool)(null, "isEqual:");
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print("nil bool = {}\n", nil_b);
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ns_object := objc_getClass("NSObject".ptr);
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my_cls := objc_allocateClassPair(ns_object, "SxBoolProbe".ptr, 0);
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// BOOL type-encoded as `B` (C99 _Bool) in `B@:` — implicit
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// (self: id, _cmd: SEL) return BOOL. Some toolchains prefer
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// `c` (signed char) for BOOL on i386, but `B` is unambiguous
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// on arm64 and works for runtime-registered IMPs.
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sel_yes := sel_registerName("yes".ptr);
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sel_no := sel_registerName("no".ptr);
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class_addMethod(my_cls, sel_yes, xx yes_imp, "B@:".ptr);
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class_addMethod(my_cls, sel_no, xx no_imp, "B@:".ptr);
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objc_registerClassPair(my_cls);
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instance := class_createInstance(my_cls, 0);
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y := #objc_call(bool)(instance, "yes");
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n := #objc_call(bool)(instance, "no");
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print("yes = {}\n", y);
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print("no = {}\n", n);
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}
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inline if OS != .macos {
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print("skipped (not macos)\n");
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}
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0;
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}
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