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).
75 lines
2.5 KiB
Plaintext
75 lines
2.5 KiB
Plaintext
// ffi-objc-arc-00b — multi-instance allocator threading.
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//
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// Verifies that EACH sx-defined-class instance captures its own
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// allocator and round-trips through it. Catches bugs where:
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// - the captured allocator is shared across instances (one global
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// slot instead of per-instance).
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// - alloc captures the wrong allocator on the 2nd+ instance.
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// - dealloc reads garbage if state[0] is overwritten between
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// instances.
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//
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// Three instances → three alloc events → three dealloc events. The
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// tracker observes exactly +3 / +3 deltas.
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#import "modules/std.sx";
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#import "modules/allocators.sx";
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#import "modules/std/objc.sx";
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#import "modules/compiler.sx";
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SxMultiProbe :: #objc_class("SxMultiProbe") {
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#extends NSObject;
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a: s32;
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b: s32;
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alloc :: () -> *SxMultiProbe;
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}
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main :: () -> s32 {
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inline if OS == .macos {
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gpa := GPA.init();
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tracker := TrackingAllocator.init(xx gpa);
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push Context.{ allocator = xx tracker, data = null } {
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alloc_before := tracker.alloc_count;
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dealloc_before := tracker.dealloc_count;
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f1 := SxMultiProbe.alloc();
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f2 := SxMultiProbe.alloc();
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f3 := SxMultiProbe.alloc();
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alloc_after_three := tracker.alloc_count - alloc_before;
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f1.release();
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f2.release();
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f3.release();
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alloc_delta := tracker.alloc_count - alloc_before;
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dealloc_delta := tracker.dealloc_count - dealloc_before;
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// alloc_delta MAY include extras from autorelease/etc. but
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// each SxMultiProbe.alloc contributes at least 1. Check the
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// BALANCE: every alloc paired with a dealloc.
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if dealloc_delta != alloc_delta {
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print("FAIL: alloc/dealloc unbalanced; alloc={} dealloc={}\n",
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alloc_delta, dealloc_delta);
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return 1;
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}
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if alloc_after_three < 3 {
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print("FAIL: 3 SxMultiProbe.alloc()s should produce >= 3 tracker allocs; saw {}\n",
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alloc_after_three);
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return 1;
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}
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if dealloc_delta < 3 {
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print("FAIL: 3 release()s should produce >= 3 tracker deallocs; saw {}\n",
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dealloc_delta);
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return 1;
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}
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}
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print("multi-instance round-trip: 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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