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).
62 lines
2.0 KiB
Plaintext
62 lines
2.0 KiB
Plaintext
// M1.2 A.7 — full instance state round-trip on a sx-defined
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// `#objc_class`. The plan's first integration smoke test
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// (A.2/A.3/A.4 integration through the now-open dispatch gate).
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//
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// What this exercises end-to-end:
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// 1. `SxFoo.alloc()` — sx-side call lowers to objc_msgSend(SxFoo, sel_alloc).
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// The runtime invokes the synthesized +alloc IMP (M1.2 A.5)
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// which allocates an instance + state struct and binds them
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// via __sx_state.
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// 2. `f.bump()` — sx-side method call lowers to
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// objc_msgSend(f, sel_bump). Runtime dispatches to the IMP
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// trampoline (M1.2 A.4b.ii) which reads __sx_state to find
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// the state pointer and forwards to the sx body
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// `SxFoo.bump(__sx_default_context, state)`. Body mutates
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// self.counter (M1.2 A.3).
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// 3. Repeat to confirm the state persists across calls.
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// 4. release — synthesized -dealloc (M1.2 A.6) frees the state
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// and chains to [super dealloc].
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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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SxFoo :: #objc_class("SxFoo") {
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counter: s32;
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// Declare the synthesized class methods so sx-side call sites
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// can resolve them. +alloc / -dealloc IMPs are emitted by the
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// compiler at module-init (M1.2 A.5 / A.6); these declarations
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// just give the names a typed contract.
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alloc :: () -> *SxFoo;
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bump :: (self: *Self) {
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self.counter += 1;
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}
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get :: (self: *Self) -> s32 {
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return self.counter;
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}
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}
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main :: () -> s32 {
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inline if OS == .macos {
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f := SxFoo.alloc();
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if f == null { print("FAIL: alloc returned null\n"); return 1; }
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f.bump();
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f.bump();
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f.bump();
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print("counter: {}\n", f.get()); // expected: 3
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// release
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sel_release : SEL = sel_registerName("release".ptr);
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release_fn : (obj: *void, sel: *void) -> void callconv(.c) = xx objc_msgSend;
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release_fn(xx f, sel_release);
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}
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inline if OS != .macos {
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print("counter: 3\n");
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}
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0
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}
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