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).
26 lines
862 B
Plaintext
26 lines
862 B
Plaintext
// Phase 1 step 1.3 (PLAN-FFI.md): smallest end-to-end `#objc_call`.
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// Void return, nil receiver — Obj-C runtime guarantees that messages
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// to nil are no-ops with a zero result, so we don't need to set up
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// a real object graph to exercise the lowering surface.
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//
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// Today (step 1.3, test-add): codegen rejects the FfiIntrinsicCall
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// AST node. Snapshot pins the failure mode.
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// Next (step 1.3, make-green): emit_llvm.zig synthesizes
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// %sel = call ptr @sel_registerName(ptr @"sel:init")
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// call void @objc_msgSend(ptr null, ptr %sel)
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// per call site (no selector interning until step 1.5).
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#import "modules/std.sx";
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#import "modules/compiler.sx";
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main :: () -> s32 {
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inline if OS == .macos {
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#objc_call(void)(null, "init");
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print("ok\n");
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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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