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).
48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
// Phase 2 step 2.7 (PLAN-FFI.md): xfail then green for the remaining
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// six type-introducer directive forms parsing with the same body
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// grammar as `#jni_class`. No codegen yet — Phase 3 picks up Obj-C
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// codegen, Phase 4 picks up Swift.
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//
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// The directives this step turns on:
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// #jni_interface — Java interface binding
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// #objc_class — Obj-C class binding
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// #objc_protocol — Obj-C protocol binding
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// #swift_class — Swift class binding (via @_cdecl bridge)
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// #swift_struct — Swift @frozen value-type binding
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// #swift_protocol — Swift @objc-bridgeable protocol binding
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//
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// Internally the AST collapses into one `foreign_class_decl` node
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// carrying a `runtime` discriminator. Today the parser rejects each
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// of these because the lexer doesn't recognise the directive name.
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#import "modules/std.sx";
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IFoo :: #foreign #jni_interface("com/example/IFoo") {
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bar :: (self: *Self) -> s32;
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}
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NSString :: #foreign #objc_class("NSString") {
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length :: (self: *Self) -> s32;
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}
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NSCopying :: #foreign #objc_protocol("NSCopying") {
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copy :: (self: *Self) -> *Self;
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}
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URL :: #foreign #swift_class("Foundation.URL") {
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absoluteString :: (self: *Self) -> *void;
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}
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Date :: #foreign #swift_struct("Foundation.Date") {
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timeIntervalSince1970 :: (self: *Self) -> f64;
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}
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Hashable :: #foreign #swift_protocol("Swift.Hashable") {
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hash :: (self: *Self) -> s32;
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}
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main :: () -> s32 {
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print("parse-only ok\n");
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0
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}
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