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).
52 lines
1.4 KiB
Plaintext
52 lines
1.4 KiB
Plaintext
// M1.2 A.4b.i — '__sx_state' ivar registration on sx-defined
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// '#objc_class'.
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//
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// Class-pair init now:
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// 1. allocs the class pair
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// 2. registers a single '__sx_state : *void' ivar
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// 3. finalises the class
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// 4. stores the runtime Ivar handle in a per-class global
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// ('__<ClassName>_state_ivar') so IMP trampolines can later
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// 'object_getIvar' the state struct pointer.
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//
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// Round-trip below: after main starts, look up SxFoo, then ask
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// the runtime if SxFoo has an Ivar named '__sx_state'. Returns
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// non-null iff registration succeeded.
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//
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// IMP trampolines (A.4b.ii) and the '+alloc' / '-dealloc'
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// overrides (A.5 / A.6) come next.
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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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class_getInstanceVariable :: (cls: *void, name: [*]u8) -> *void #foreign objc;
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SxFoo :: #objc_class("SxFoo") {
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counter: s32;
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bump :: (self: *Self) {
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self.counter += 1;
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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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cls : Class = objc_getClass("SxFoo".ptr);
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if cls == null {
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print("FAIL: SxFoo not registered\n");
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return 1;
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}
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iv := class_getInstanceVariable(cls, "__sx_state".ptr);
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if iv == null {
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print("FAIL: __sx_state ivar missing\n");
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return 1;
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}
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print("ivar: __sx_state\n");
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}
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inline if OS != .macos {
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print("ivar: __sx_state\n");
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}
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0
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}
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