b97da83e8b
The .pure->.naked rename (a7fe165) git-mv'd examples 1800-1803 to their
naked names but the perl content edit (abi(.pure) -> abi(.naked) in the
bodies/comments) was never re-staged, so HEAD carried the renamed files
with stale abi(.pure) bodies — which the compiler now rejects ("unknown
ABI"). The working tree had the correct .naked bodies uncommitted; this
commits them so HEAD parses + builds clean.
26 lines
1.1 KiB
Plaintext
26 lines
1.1 KiB
Plaintext
// Stream B1 (fibers) — an `abi(.naked)` function with PARAMETERS reads its args
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// from ABI registers (the shape the fiber context-switch needs: `swap_context`
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// reads `from`/`to` from x0/x1).
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//
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// A naked function has no frame, so params are NOT spilled to stack slots — they
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// stay in their ABI registers and the asm body reads them directly. Here `a` is
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// in x0, `b` in x1 (aarch64 AAPCS), and the result returns in x0: `add x0, x0,
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// x1`. The lowering skips the param-alloca loop for `.naked` (decl.zig /
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// generic.zig); the LLVM args are declared-but-unused, which the verifier allows
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// (spilling them would emit `store i64 %0, …` → "cannot use argument of naked
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// function"). aarch64-pinned; runs end-to-end (exit 42), ir-only on a mismatch.
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//
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// Regression for an adversarial-review finding: before the param-alloca guard, a
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// param-bearing `.naked` fn emitted invalid LLVM (loud verifier error) instead of
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// a working naked function.
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add :: (a: i64, b: i64) -> i64 abi(.naked) {
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asm volatile {
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#string A
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add x0, x0, x1
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ret
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A
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};
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}
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main :: () -> i64 { return add(40, 2); }
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