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).
44 lines
1.6 KiB
Plaintext
44 lines
1.6 KiB
Plaintext
// Phase 3 step 3.1 (PLAN-FFI.md): static call `Cls.class_method(args)`
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// on an `#objc_class` alias lowers to `objc_msg_send` against the class
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// object (loaded once per module via `objc_getClass` and cached). The
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// selector is derived by the same default mangling as Phase 3.0
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// (`stringWithUTF8String_(s)` → "stringWithUTF8String:").
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//
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// Mirrors JNI's static-dispatch surface (`Alias.new(...)` etc.); the
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// lowering disambiguates static vs instance by looking at
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// `method.is_static` on the foreign-class member.
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//
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// Uses NSObject because the cached class slot is populated by a
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// constructor at module-load — runtime-created test classes wouldn't
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// exist yet when `objc_getClass` runs. NSObject is always available
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// on macOS via libobjc.
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#import "modules/std.sx";
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#import "modules/compiler.sx";
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NSObject :: #foreign #objc_class("NSObject") {
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// `+(Class)class` — niladic, name verbatim, selector = "class".
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// Returns the class object itself. No `self: *Self` first param ⇒
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// class method (sx parser keys on the param TYPE).
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class :: () -> *void;
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// `+(NSString *)description` on the class returns a description
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// string. Niladic, selector = "description".
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description :: () -> *void;
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}
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main :: () -> s32 {
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inline if OS == .macos {
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c := NSObject.class();
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if c != null {
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print("class non-null\n");
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}
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d := NSObject.description();
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if d != null {
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print("description non-null\n");
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}
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}
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inline if OS != .macos {
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print("skipped (not macos)\n");
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}
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0
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}
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