87572579b4
For each instance method on a sx-defined '#objc_class', the
class-pair init constructor now:
sel = sel_registerName("selector_string")
imp = @__<Cls>_<method>_imp (M1.2 A.4b.ii)
class_addMethod(cls, sel, imp, "<encoding>")
before objc_registerClassPair. The IMP trampoline (A.4b.ii)
already bridges C-ABI -> sx body. With registration in place,
'objc_msgSend(obj, sel_bump)' now routes to the trampoline,
which reads __sx_state ivar and forwards to '@<Cls>.<method>'.
To get selector + type-encoding strings out of lower.zig and
into emit_llvm, ObjcDefinedClassEntry gains a 'methods' slice:
pub const ObjcDefinedMethodEntry = struct {
sel: []const u8, // mangled selector (M1.2 A.1's deriveObjcSelector)
encoding: []const u8, // type encoding (M1.2 A.1's objcTypeEncodingFromSignature)
imp_name: []const u8, // C-callconv trampoline symbol
};
registerObjcDefinedClassMethods populates this when it declares
each method's body function; Module.setObjcDefinedClassMethods
attaches the slice to the cache entry by name. Static (class-
side) methods are skipped — A.4b only covers instance methods;
class-method hooks like '+layerClass' land in M2.1.
emit_llvm reads entry.methods and emits class_addMethod inside
the per-class init block, before objc_registerClassPair (the
runtime locks the method list at register time on some SDK
versions).
145-objc-class-method-dispatch.sx verifies end-to-end:
class_getMethodImplementation(SxFoo, sel_registerName("bump"))
returns non-null after main starts. Both niladic ('bump') and
single-arg ('add:') selectors checked.
Still gated (A.7): sx-side 'obj.bump()' calls. The dispatch
gate at lower.zig:4407 hasn't opened — A.5 (+alloc) and A.6
(-dealloc) need to land first so the integration test
ffi-objc-defined-class-01-instance.sx (full state round-trip)
can exercise the full lifecycle.
174 example tests pass (+1 from 145). zig build test green.
52 lines
1.7 KiB
Plaintext
52 lines
1.7 KiB
Plaintext
// M1.2 A.4b.iii — instance-method dispatch through the Obj-C
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// runtime. Each instance method now gets a C-ABI IMP trampoline
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// registered via 'class_addMethod' at class-pair init time. The
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// runtime can dispatch 'objc_msgSend(obj, sel)' to the
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// trampoline, which reads the '__sx_state' ivar to find the
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// state struct and forwards to the sx body.
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//
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// End-to-end (verifies registration only — sx-side
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// 'obj.bump()' calls still bail at the M1.2 A.7 dispatch gate
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// until +alloc/-dealloc (A.5/A.6) land too):
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// 1. class_getMethodImplementation(SxFoo, sel_registerName("bump"))
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// returns a non-null IMP — proves the trampoline is wired.
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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_getMethodImplementation :: (cls: *void, sel: *void) -> *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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add :: (self: *Self, n: s32) {
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self.counter += n;
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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 { print("FAIL: SxFoo not registered\n"); return 1; }
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sel_bump : SEL = sel_registerName("bump".ptr);
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imp_bump : *void = class_getMethodImplementation(cls, sel_bump);
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if imp_bump == null { print("FAIL: bump IMP missing\n"); return 1; }
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sel_add : SEL = sel_registerName("add:".ptr);
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imp_add : *void = class_getMethodImplementation(cls, sel_add);
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if imp_add == null { print("FAIL: add: IMP missing\n"); return 1; }
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print("IMP: bump ok, add: ok\n");
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}
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inline if OS != .macos {
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print("IMP: bump ok, add: ok\n");
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}
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0;
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}
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