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).
49 lines
1.9 KiB
Plaintext
49 lines
1.9 KiB
Plaintext
// Backfill for Phase 1D cluster 1.28 (PLAN-FFI.md): `#objc_call(bool)`
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// against `BOOL`-returning selectors. Obj-C `BOOL` is single-byte on
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// every Apple ABI we ship to (signed char on i386, native `bool` on
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// arm64), so the slot shape is identical to `#objc_call(u8)` — this
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// test is about the source-level type being meaningful, not a
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// distinct ABI path.
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//
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// Two IMPs are installed: `yes_imp` returns true, `no_imp` returns
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// false. Both are dispatched through `#objc_call(bool)` and the
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// results are checked.
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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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yes_imp :: (self: *void, _cmd: *void) -> bool callconv(.c) { true }
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no_imp :: (self: *void, _cmd: *void) -> bool callconv(.c) { false }
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main :: () -> s32 {
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inline if OS == .macos {
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// Nil-recv: libobjc returns a zeroed slot, which decodes as false.
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nil_b := #objc_call(bool)(null, "isEqual:");
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print("nil bool = {}\n", nil_b);
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ns_object := objc_getClass("NSObject".ptr);
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my_cls := objc_allocateClassPair(ns_object, "SxBoolProbe".ptr, 0);
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// BOOL type-encoded as `B` (C99 _Bool) in `B@:` — implicit
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// (self: id, _cmd: SEL) return BOOL. Some toolchains prefer
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// `c` (signed char) for BOOL on i386, but `B` is unambiguous
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// on arm64 and works for runtime-registered IMPs.
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sel_yes := sel_registerName("yes".ptr);
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sel_no := sel_registerName("no".ptr);
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class_addMethod(my_cls, sel_yes, xx yes_imp, "B@:".ptr);
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class_addMethod(my_cls, sel_no, xx no_imp, "B@:".ptr);
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objc_registerClassPair(my_cls);
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instance := class_createInstance(my_cls, 0);
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y := #objc_call(bool)(instance, "yes");
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n := #objc_call(bool)(instance, "no");
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print("yes = {}\n", y);
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print("no = {}\n", 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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