agra
87572579b4
ffi M1.2 A.4b.iii: class_addMethod wires IMPs to the Obj-C runtime
...
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.
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