79419b99bd
Protocol structs registered via registerProtocolDecl carry a new is_protocol flag; the ?T paths in sizeOf/typeSizeBytes/toLLVMType recognise it and lay out ?Protocol as the protocol struct itself (ctx == null IS the "none" state), matching how ?Closure / ?*T are sentinel-shaped — no extra storage. Method dispatch on ?Protocol auto-unwraps in lowerCall's field-access path; the unwrap is structurally a no-op so we just rebind obj_ty to the payload type. resolveCallParamTypes extended for optional-protocol receivers so enum-literal args (gpu.create_texture(.r8, ...)) get the right target_type and don't silently collapse to tag=0 : s32 — same issue-0031-class bug closed in Session 66, one type-system layer deeper. Library: UIRenderer / UIPipeline / GlyphCache migrated from the verbose gpu: GPU = ---; has_gpu: bool pattern to gpu: ?GPU = null. set_gpu no longer maintains a parallel bool flag. Bundled: dock.sx threads delta_time as a struct field rather than via a global pointer (cleanup unrelated to issue-0028, committed alongside). Verified: 85/85 regression tests pass; iOS-sim chess + macOS chess both render correctly post-migration.
35 lines
778 B
Plaintext
35 lines
778 B
Plaintext
// `?Protocol = null` — optional protocol boxes use sentinel-shape
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// (ctx == null is the "none" state), so they cost no extra storage
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// beyond the protocol's standard 2-pointer layout. Method calls on
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// a non-null optional protocol auto-unwrap and dispatch through the
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// vtable / inline fn-ptrs as usual.
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#import "modules/std.sx";
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GPU :: protocol {
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ping :: () -> s64;
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}
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Impl :: struct {}
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impl GPU for Impl {
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ping :: (self: *Impl) -> s64 { 42; }
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}
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main :: () -> s32 {
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g : ?GPU = null;
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if g != null {
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print("BAD: g not null at start\n");
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} else {
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print("g initially null\n");
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}
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g = xx @Impl.{};
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if g != null {
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n := g.ping();
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print("after assign: g.ping() = {}\n", n);
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} else {
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print("BAD: g still null after assign\n");
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}
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0;
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}
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