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).
42 lines
1.5 KiB
Plaintext
42 lines
1.5 KiB
Plaintext
// Phase 1 step 1.10 (PLAN-FFI.md): multi-keyword Obj-C selectors
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// through `#objc_call`. Selector mangling matches clang's: every
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// `:` in the source-level selector becomes a `_` in the symbol
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// name of the cached SEL slot (so `initWithFrame:options:` →
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// `OBJC_SELECTOR_REFERENCES_initWithFrame_options_`).
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//
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// The selector is opaque text to the lowering — no codegen change
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// needed beyond Phase 1.6's variadic argument list. This test
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// pins that the round-trip works end-to-end via class_addMethod
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// + a real IMP that consumes both keyword args.
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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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combine_imp :: (self: *void, _cmd: *void, a: s32, b: s32) -> s32 callconv(.c) {
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a * 100 + b
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}
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main :: () -> s32 {
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inline if OS == .macos {
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ns_object := objc_getClass("NSObject".ptr);
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my_cls := objc_allocateClassPair(ns_object, "SxComboProbe".ptr, 0);
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// Two-keyword selector: `combine:and:`.
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// Method type encoding: i@:ii → returns int, implicit (self, _cmd),
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// takes two ints. (`i` = int, `@` = id, `:` = SEL.)
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sel := sel_registerName("combine:and:".ptr);
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ok := class_addMethod(my_cls, sel, xx combine_imp, "i@:ii".ptr);
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print("addMethod = {}\n", ok);
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objc_registerClassPair(my_cls);
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instance := class_createInstance(my_cls, 0);
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r := #objc_call(s32)(instance, "combine:and:", 7, 42);
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print("combine(7, 42) = {}\n", r);
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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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