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) — `abi(.naked)` emits a naked function end-to-end.
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//
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// An `abi(.naked)` function has no calling-convention prologue/epilogue/frame
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// and no implicit `__sx_ctx`: its body is a single asm block that sets the
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// return register and emits its own `ret`. This is the substrate the per-arch
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// fiber context-switch is built on (design §4.6) — a `.c` epilogue would
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// restore SP from the wrong stack across a switch (SP-in ≠ SP-out by design).
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//
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// Lowered via LLVM's `naked` function attribute: the body is emitted verbatim
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// (the inline asm + its own `ret`) with NO frame setup; the IR shows
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// `attributes #N = { naked noinline nounwind }` and the bare asm. aarch64-pinned
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// (the asm body is per-arch); runs end-to-end here (exit 42), ir-only on a
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// mismatch. See the x86_64 sibling 1802. NOTE: the `.ir` proves the `naked`
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// keyword + asm emitted, NOT register-save correctness (that's the B1.3
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// switch-stress harness's job).
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answer :: () -> i64 abi(.naked) {
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asm volatile {
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#string ASM
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mov x0, #42
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ret
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ASM
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};
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}
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main :: () -> i64 { return answer(); }
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