bdd0e96d78
A block's value is now its last statement ONLY when that statement is a trailing expression with no `;`. A trailing `;` discards the value, leaving the block void. This makes value-vs-statement explicit and lets the compiler reject "this block was supposed to produce a value". Compiler: - Parser records `Block.produces_value` (last stmt is a no-`;` trailing expression) + `Block.discarded_semi` (the `;` that discarded a value), via `expectSemicolonAfter`. A trailing expression before `}` may now omit its `;` (previously a parse error). Match-arm and else-arm bodies are built value-producing regardless of the arm `;` (arms are exempt — the `;` is an arm terminator). - Lowering: `lowerBlockValue` / the block-expr path / `inferExprType` respect `produces_value`. A value-position block that discards its value is a hard error (`lowerValueBody` for function bodies; the value-context `.block` path for if/else branches, `catch` bodies, value bindings, match arms). Pure-failable `-> !` bodies (value rides the error channel) and a value-if whose branches are void are handled without false errors. - `defer`/`onfail` cleanup bodies lower as statements (void), so a trailing `;` there is fine. Migration (behavior-preserving — output unchanged): - stdlib + ~210 examples: dropped the trailing `;` on value-position last expressions. `format` now ends with an explicit `#insert "return result;"` (it relied on `#insert`-as-block-value, which `;` discards). - Two `main :: () -> s32` examples that relied on the old silent default-return got an explicit trailing `0`. - Rejection snapshots 0412 / 1013 regenerated (their quoted source lines lost a `;`); the diagnostics themselves are unchanged. Docs/tests: specs.md "Block values" section; examples 0040 (rules) + 0041 (rejection); 3 parser unit tests. Filed issue 0066 (pre-existing match-arm negated-literal phi-width quirk, surfaced not caused here). Gates: zig build, zig build test, run_examples.sh -> 343 passed, cross_compile.sh -> 7 passed (also refreshed its stale example names).
48 lines
1.6 KiB
Plaintext
48 lines
1.6 KiB
Plaintext
// M1.1 — Obj-C primitive type aliases.
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//
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// `id`, `Class`, `SEL`, `BOOL` from `modules/std/objc.sx` stand in
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// for the three opaque Obj-C runtime types and Apple's signed-char
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// boolean. They resolve to `*void` / `s8` at the LLVM layer — no
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// runtime cost — but make foreign-class and call-site declarations
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// read closer to Objective-C source.
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//
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// `Class(T)` parameterization (phantom T, `#extends`-aware
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// covariance) is deferred to a follow-up; for now plain `Class`
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// is the only form and assignments are not checked against the
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// referent's class hierarchy.
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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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// Foreign-class declaration using the aliases at param/return positions.
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NSObjectAlias :: #foreign #objc_class("NSObject") {
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alloc :: () -> *Self;
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init :: (self: *Self) -> *Self;
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isKindOfClass :: (self: *Self, cls: Class) -> BOOL;
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}
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main :: () -> s32 {
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inline if OS == .macos {
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// id - any Obj-C instance pointer.
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nsobj : id = NSObjectAlias.alloc().init();
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// Class - the runtime class object.
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ns_cls : Class = objc_getClass("NSObject".ptr);
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// SEL - registered selector.
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sel : SEL = sel_registerName("alloc".ptr);
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_ = sel;
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// BOOL - Apple's signed-char boolean. Cast the *Self into
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// a *NSObjectAlias for the method call.
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obj : *NSObjectAlias = xx nsobj;
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flag : BOOL = obj.isKindOfClass(ns_cls);
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print("isKindOfClass: {}\n", flag); // 1 (true)
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}
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inline if OS != .macos {
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print("isKindOfClass: 1\n"); // skip — runtime not present
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}
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0
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}
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