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).
44 lines
1.5 KiB
Plaintext
44 lines
1.5 KiB
Plaintext
// Phase 3 step 3.0 (PLAN-FFI.md): `inst.method(args)` on an
|
|
// `#objc_class`-typed receiver lowers to `objc_msg_send` with a derived
|
|
// selector. This test covers the niladic shape: the sx-side method name
|
|
// is used verbatim as the selector (`length` → `length`).
|
|
//
|
|
// Test pattern mirrors `ffi-objc-call-08-multi-keyword.sx`: synthesize a
|
|
// fresh class at runtime via `objc_allocateClassPair` + `class_addMethod`,
|
|
// declare the sx-side `#objc_class` against the same name, then invoke
|
|
// the DSL form. On macOS this exercises the real Obj-C runtime; on
|
|
// other platforms the test skips.
|
|
//
|
|
// Pre-3.0: the dispatch bails at lower.zig with "method calls on
|
|
// 'objc_class' runtime not yet supported (Phase 3/4)". Snapshot captures
|
|
// that diagnostic.
|
|
#import "modules/std.sx";
|
|
#import "modules/compiler.sx";
|
|
#import "modules/std/objc.sx";
|
|
|
|
SxProbeNiladic :: #foreign #objc_class("SxProbeNiladic") {
|
|
length :: (self: *Self) -> s32;
|
|
}
|
|
|
|
length_imp :: (self: *void, _cmd: *void) -> s32 callconv(.c) {
|
|
42
|
|
}
|
|
|
|
main :: () -> s32 {
|
|
inline if OS == .macos {
|
|
ns_object := objc_getClass("NSObject".ptr);
|
|
cls := objc_allocateClassPair(ns_object, "SxProbeNiladic".ptr, 0);
|
|
sel := sel_registerName("length".ptr);
|
|
class_addMethod(cls, sel, xx length_imp, "i@:".ptr);
|
|
objc_registerClassPair(cls);
|
|
|
|
inst : *SxProbeNiladic = xx class_createInstance(cls, 0);
|
|
n := inst.length();
|
|
print("length = {}\n", n);
|
|
}
|
|
inline if OS != .macos {
|
|
print("skipped (not macos)\n");
|
|
}
|
|
0
|
|
}
|