a68f7c2e64
18 obj-c examples migrated (1308/1311-1317/1319/1320/1321/1341-1347): import
runtime classes '#foreign #objc_class("X") {' → '#objc_class("X") extern {'
(prefix→postfix) + fn/comment '#foreign'→'extern'. No 13xx snapshot asserts on
'foreign' text → all behavior-preserving; empty snapshot diff, corpus-validated.
Per the keep-list policy: KEPT identity-#foreign tests 1306/1318 (filename
ffi-*-foreign*); LEFT comment-only #foreign in the extern/export test files
1332/1348/1349 (no decls). Bare defined #objc_class examples (no #foreign) untouched
— not a purge target. Suite green (647 corpus / 444 unit, 0 failed).
63 lines
2.0 KiB
Plaintext
63 lines
2.0 KiB
Plaintext
// M2.3 — `#extends ForeignClass` method-resolution chaining.
|
|
//
|
|
// When `obj.method()` is called on a foreign-class pointer and
|
|
// `method` isn't declared directly on the receiver's class, the
|
|
// compiler walks the `#extends` chain to find an ancestor that
|
|
// declared it. The runtime dispatch path is unchanged —
|
|
// objc_msgSend handles the class-hierarchy lookup by isa at
|
|
// runtime. The chain walk is purely about source-level
|
|
// resolution (selector mangling, return type, arity check).
|
|
|
|
#import "modules/std.sx";
|
|
#import "modules/build.sx";
|
|
#import "modules/ffi/objc.sx";
|
|
|
|
NSObjectBase :: #objc_class("NSObject") extern {
|
|
alloc :: () -> *NSObjectBase;
|
|
init :: (self: *NSObjectBase) -> *NSObjectBase;
|
|
hash :: (self: *NSObjectBase) -> u64;
|
|
}
|
|
|
|
// Sx-defined class that extends a foreign one. M1.2 registers
|
|
// the class at module init; `hash` is reached via the M2.3 chain
|
|
// walk through NSObjectBase, then dispatched by objc_msgSend.
|
|
SxThing :: #objc_class("SxThing") {
|
|
#extends NSObjectBase;
|
|
counter: i32;
|
|
|
|
alloc :: () -> *SxThing;
|
|
init :: (self: *SxThing) -> *SxThing;
|
|
}
|
|
|
|
// And a chain-of-three: SxLeaf → SxMiddle → NSObjectBase.
|
|
SxMiddle :: #objc_class("SxMiddle") {
|
|
#extends NSObjectBase;
|
|
alloc :: () -> *SxMiddle;
|
|
init :: (self: *SxMiddle) -> *SxMiddle;
|
|
}
|
|
SxLeaf :: #objc_class("SxLeaf") {
|
|
#extends SxMiddle;
|
|
alloc :: () -> *SxLeaf;
|
|
init :: (self: *SxLeaf) -> *SxLeaf;
|
|
}
|
|
|
|
main :: () -> i32 {
|
|
inline if OS == .macos {
|
|
// 1-level chain: SxThing → NSObjectBase.
|
|
t := SxThing.alloc().init();
|
|
h_t : u64 = t.hash();
|
|
if h_t == 0 { print("FAIL: SxThing.hash returned 0\n"); return 1; }
|
|
|
|
// 2-level chain: SxLeaf → SxMiddle → NSObjectBase.
|
|
l := SxLeaf.alloc().init();
|
|
h_l : u64 = l.hash();
|
|
if h_l == 0 { print("FAIL: SxLeaf.hash returned 0\n"); return 1; }
|
|
|
|
print("extends chain: SxThing.hash=ok, SxLeaf.hash=ok\n");
|
|
}
|
|
inline if OS != .macos {
|
|
print("extends chain: SxThing.hash=ok, SxLeaf.hash=ok\n");
|
|
}
|
|
0
|
|
}
|