6d258ad82b
`appendObjcEncoding` previously bailed on `.@"struct"`, which blocked
sx-defined `#objc_class` methods from declaring CGPoint / CGRect /
NSRange-shape signatures — the `class_addMethod` registration path
would emit a "type kind not yet supported by Obj-C encoding"
diagnostic. The helper now emits Apple's `{Name=field0field1...}`
form recursively, with a small `ObjcEncodingStack` (cap 16) that
breaks transitive struct→struct cycles by emitting the abbreviated
`{Name}` form instead of recursing forever.
`{Point=dd}`, `{_NSRange=QQ}`, `{CGRect={CGPoint=dd}{CGSize=dd}}`
all flow through the existing `objc_msg_send` + `class_addMethod`
path with no further plumbing.
Tests:
- `lower.test.zig` gains four cases: optional unwrap (single + nested),
flat struct (CGPoint, NSRange shape), nested struct (CGRect with
CGPoint+CGSize), bringing the helper's test coverage from
primitives + pointers to the full encoding table.
- `examples/ffi-objc-defined-class-02-struct-encoding.sx` exercises
a sx-defined `SxMover` class with `goto(p: Point)` setter and
`here() -> Point` getter end-to-end on macOS; the IR snapshot
confirms `v@:{Point=dd}` and `{Point=dd}@:` land in
`OBJC_METH_VAR_TYPE_` constants wired to `class_addMethod`.
Checkpoint cleanup: the "Next step (M1.2 A.1 — type-encoding
derivation table)" header in CHECKPOINT-FFI.md was stale (A.1
shipped in 6cc016c; A.0–A.7 all done; commit list now linked).
The encoding table stays as reference material.
224/224 example tests pass; zig build test green.
63 lines
1.9 KiB
Plaintext
63 lines
1.9 KiB
Plaintext
// M1.2 A.1 follow-up — pass-by-value struct args/returns in
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// sx-defined `#objc_class` methods.
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//
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// Wires the new `{Name=field0field1...}` arm of
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// `appendObjcEncoding` into `class_addMethod` registration. Without
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// it, methods that take or return a value-type struct (CGPoint,
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// CGSize, NSRange shapes) used to fail signature-encoding
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// derivation with a "type kind not yet supported" diagnostic.
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//
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// Each sx-defined method registered with the Obj-C runtime needs an
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// encoding string built from its IR signature. For
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// `goto :: (self: *Self, p: Point)` that string is `v@:{Point=dd}`
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// — return void, receiver `@`, selector `:`, then the struct
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// argument `{Point=dd}`.
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//
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// We don't observe the encoding string directly here (it ends up in
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// a private OBJC_METH_VAR_TYPE_ cstring in the linked binary) — but
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// the compiler bails LOUDLY on unsupported types per the project's
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// REJECTED PATTERNS rule, so a successful build is the encoding
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// going through cleanly.
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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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Point :: struct {
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x: f64;
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y: f64;
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}
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SxMover :: #objc_class("SxMover") {
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pos: Point;
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alloc :: () -> *SxMover;
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goto :: (self: *Self, p: Point) {
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self.pos = p;
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}
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here :: (self: *Self) -> Point {
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return self.pos;
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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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m := SxMover.alloc();
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if m == null { print("FAIL: alloc returned null\n"); return 1; }
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m.goto(Point.{ x = 7.5, y = 8.25 });
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p := m.here();
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print("at: ({}, {})\n", p.x, p.y); // expected: at: (7.500000, 8.250000)
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sel_release : SEL = sel_registerName("release".ptr);
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release_fn : (obj: *void, sel: *void) -> void callconv(.c) = xx objc_msgSend;
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release_fn(xx m, sel_release);
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}
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inline if OS != .macos {
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print("at: (7.500000, 8.250000)\n");
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}
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0;
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}
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