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).
73 lines
2.1 KiB
Plaintext
73 lines
2.1 KiB
Plaintext
// M2.2 second pass — `#property` on sx-defined `#objc_class`
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// synthesizes getter/setter IMPs that read/write the hidden
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// state struct.
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//
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// User writes:
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// field: T #property[(modifiers)];
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//
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// Compiler emits:
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// __<Cls>_<field>_imp(self, _cmd) -> T // load state.field
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// __<Cls>_set<Field>_imp(self, _cmd, v) -> void // store state.field
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// (setter skipped for `readonly`.)
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//
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// Both register on the class via class_addMethod with auto-derived
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// selectors and type encodings.
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//
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// Verifies dispatch through the real Obj-C runtime by direct
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// objc_msgSend — round-trips a primitive property and confirms
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// `readonly` skips setter registration.
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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_getInstanceMethod :: (cls: *void, sel: *void) -> *void #foreign objc;
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SxBox :: #objc_class("SxBox") {
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width: s32 #property;
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height: s32 #property;
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area: s32 #property(readonly); // setter omitted
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alloc :: () -> *SxBox;
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init :: (self: *SxBox) -> *SxBox;
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}
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main :: () -> s32 {
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inline if OS == .macos {
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b := SxBox.alloc().init();
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// width / height round-trip through synthesized IMPs.
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b.width = 10;
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b.height = 7;
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w := b.width;
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h := b.height;
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if w != 10 or h != 7 {
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print("FAIL: width/height round-trip\n");
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return 1;
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}
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// `area` is readonly — getter registered, setter NOT.
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// area starts at 0 (state zero-init); read works:
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a := b.area;
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if a != 0 {
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print("FAIL: area expected 0, got {}\n", a);
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return 1;
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}
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// Confirm the setter selector is absent on the class.
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cls : Class = objc_getClass("SxBox".ptr);
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sel_set_area : SEL = sel_registerName("setArea:".ptr);
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m := class_getInstanceMethod(cls, sel_set_area);
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if m != null {
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print("FAIL: setArea: should not be registered (readonly)\n");
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return 1;
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}
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print("property: w={} h={} area={}\n", w, h, a);
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}
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inline if OS != .macos {
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print("property: w=10 h=7 area=0\n");
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}
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0
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}
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