e898effb4b
Extends the failable-main entry-point wrapper to a value-carrying main.
`main :: () -> (int, !)` now exits the integer value on success (truncated
to u8, like a plain integer main) and reports the header + trace to stderr
+ exits 1 on an escaping error (same reporter as the pure `-> !` form).
- lower.zig validateMainSignature: accept a 2-field `{int, error_set}`
tuple return (set needs_trace_runtime) instead of rejecting it. Multi-
value `-> (T1, T2, !)` and non-integer value slots still reject — there's
no single integer exit code to map them to (sharpened diagnostic).
- emit_llvm.zig: the `.ret` arm detects a value-carrying main (tuple ending
in `.error_set`) and extracts `{value, tag}` (extractvalue 0/1) before
calling emitFailableMainRet, now generalized to take an optional `value`
(null → pure `-> !`, success exits 0; present → success exits the value).
C reporter unchanged.
All E4.2 entry-point shapes (void / int / `-> !` / `-> (int, !)`) now done.
examples/245-failable-main-value.sx (exit 64); 239 comment refreshed.
16 lines
758 B
Plaintext
16 lines
758 B
Plaintext
// Entry-point signature gate (ERR step E4.2). `main` must take no parameters
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// and have one of: void, an integer (POSIX exit code), `-> !` (failable, no
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// value), or `-> (int, !)` (failable + integer exit code). Anything else is a
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// clean diagnostic — previously `main :: () -> string` SEGFAULTED (the JIT
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// calls main as `() -> i32`, so a string return is read as garbage). Accepted
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// shapes are exercised elsewhere (238 integer-exit truncation, 244 `-> !`,
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// 245 `-> (int, !)`). This file is expected to FAIL compilation (exit 1).
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//
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// Run: ./zig-out/bin/sx run examples/239-main-signature-reject.sx
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#import "modules/std.sx";
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main :: () -> string { // ERROR: return type must be void, an integer, or `!`
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return "not an exit code";
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}
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