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
1.5 KiB
Plaintext
49 lines
1.5 KiB
Plaintext
// M1.3 — `obj.class` accessor on Obj-C pointers.
|
|
//
|
|
// Any Obj-C-class pointer (foreign or sx-defined) can be probed
|
|
// for its runtime class object via `obj.class`. Lowers to
|
|
// `object_getClass(obj)`. Returns `Class` (alias for *void —
|
|
// parameterized `Class(T)` covariance is M1.1.b).
|
|
//
|
|
// Verifies both shapes:
|
|
// 1. (*SxFoo).class — sx-defined class. Returns the SxFoo Class.
|
|
// 2. (*NSObject).class — foreign class via stdlib. Returns NSObject's
|
|
// Class.
|
|
|
|
#import "modules/std.sx";
|
|
#import "modules/compiler.sx";
|
|
#import "modules/std/objc.sx";
|
|
|
|
NSObjectFwd :: #foreign #objc_class("NSObject") {
|
|
alloc :: () -> *NSObjectFwd;
|
|
init :: (self: *NSObjectFwd) -> *NSObjectFwd;
|
|
}
|
|
|
|
SxFoo :: #objc_class("SxFoo") {
|
|
counter: s32;
|
|
alloc :: () -> *SxFoo;
|
|
bump :: (self: *Self) { self.counter += 1; }
|
|
}
|
|
|
|
main :: () -> s32 {
|
|
inline if OS == .macos {
|
|
// sx-defined class round-trip.
|
|
f := SxFoo.alloc();
|
|
cls_f : Class = f.class;
|
|
expected_f : Class = objc_getClass("SxFoo".ptr);
|
|
if cls_f != expected_f { print("FAIL: SxFoo.class mismatch\n"); return 1; }
|
|
|
|
// foreign class round-trip.
|
|
nso := NSObjectFwd.alloc().init();
|
|
cls_n : Class = nso.class;
|
|
expected_n : Class = objc_getClass("NSObject".ptr);
|
|
if cls_n != expected_n { print("FAIL: NSObject.class mismatch\n"); return 1; }
|
|
|
|
print("class accessor: ok\n");
|
|
}
|
|
inline if OS != .macos {
|
|
print("class accessor: ok\n");
|
|
}
|
|
0
|
|
}
|