9719432e79
Capital-Foreign + stale-identifier comment refs: library (Foreign Java types→Runtime, foreign-class→runtime-class, foreign_class_map→runtime_class_map); docs/debugger (foreign call→extern call); docs/fork-c ledger (foreign_class_map, protocol/foreign→ runtime-class); docs/inline-asm-design Deviation-6 obsolete #foreign-vs-extern design RESOLVED to the landed extern/export reality; example comments (parseForeignClassDecl→ parseRuntimeClassDecl, checkForeignRefs→checkExternRefs, Foreign decls→Extern). Docs/ comments only — no build impact.
63 lines
2.0 KiB
Plaintext
63 lines
2.0 KiB
Plaintext
// M2.3 — `#extends a runtime class` method-resolution chaining.
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//
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// When `obj.method()` is called on a runtime-class pointer and
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// `method` isn't declared directly on the receiver's class, the
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// compiler walks the `#extends` chain to find an ancestor that
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// declared it. The runtime dispatch path is unchanged —
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// objc_msgSend handles the class-hierarchy lookup by isa at
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// runtime. The chain walk is purely about source-level
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// resolution (selector mangling, return type, arity check).
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#import "modules/std.sx";
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#import "modules/build.sx";
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#import "modules/ffi/objc.sx";
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NSObjectBase :: #objc_class("NSObject") extern {
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alloc :: () -> *NSObjectBase;
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init :: (self: *NSObjectBase) -> *NSObjectBase;
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hash :: (self: *NSObjectBase) -> u64;
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}
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// Sx-defined class that extends a runtime one. M1.2 registers
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// the class at module init; `hash` is reached via the M2.3 chain
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// walk through NSObjectBase, then dispatched by objc_msgSend.
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SxThing :: #objc_class("SxThing") {
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#extends NSObjectBase;
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counter: i32;
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alloc :: () -> *SxThing;
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init :: (self: *SxThing) -> *SxThing;
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}
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// And a chain-of-three: SxLeaf → SxMiddle → NSObjectBase.
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SxMiddle :: #objc_class("SxMiddle") {
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#extends NSObjectBase;
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alloc :: () -> *SxMiddle;
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init :: (self: *SxMiddle) -> *SxMiddle;
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}
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SxLeaf :: #objc_class("SxLeaf") {
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#extends SxMiddle;
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alloc :: () -> *SxLeaf;
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init :: (self: *SxLeaf) -> *SxLeaf;
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}
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main :: () -> i32 {
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inline if OS == .macos {
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// 1-level chain: SxThing → NSObjectBase.
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t := SxThing.alloc().init();
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h_t : u64 = t.hash();
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if h_t == 0 { print("FAIL: SxThing.hash returned 0\n"); return 1; }
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// 2-level chain: SxLeaf → SxMiddle → NSObjectBase.
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l := SxLeaf.alloc().init();
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h_l : u64 = l.hash();
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if h_l == 0 { print("FAIL: SxLeaf.hash returned 0\n"); return 1; }
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print("extends chain: SxThing.hash=ok, SxLeaf.hash=ok\n");
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}
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inline if OS != .macos {
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print("extends chain: SxThing.hash=ok, SxLeaf.hash=ok\n");
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}
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0
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}
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