66bdc70bf1
Move examples/*.sx and their expected/ snapshots into per-category subfolders (examples/<category>/...). Folder = leading filename token, with ffi-objc/ffi-jni kept whole; filenames are unchanged. The corpus runner and LSP sweep now discover each category's expected/ dir, while issues/ stays flat. Example 1058's repo-root-relative companion import is made file-relative. Path strings embedded in 164 snapshots were regenerated (path-only changes). Test-layout docs in CLAUDE.md updated.
36 lines
1.4 KiB
Plaintext
36 lines
1.4 KiB
Plaintext
// ASM stream — the round trip: sx → asm → sx. A global-asm routine (`_caller`)
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// CALLS BACK into an sx function (`cb`) by its symbol, then returns. For the asm
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// `bl _cb` to resolve, the sx callback needs EXTERNAL LINKAGE and a stable C
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// symbol — that is exactly what `export` provides (it also implies the C ABI, so
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// no hidden context parameter). `abi(.c)` alone is NOT enough: it sets the
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// ABI but leaves the function `internal`, so it is dead-code-eliminated (nothing
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// in the IR references it — the `bl` is opaque to the optimizer) and `_cb` is
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// undefined at link. macOS gives `export "cb"` the symbol `_cb` (leading
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// underscore), which the template references. aarch64-macos-pinned; runs under
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// the JIT here (sx run), ir-only elsewhere.
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// The sx callback — `export` gives it external linkage + the `_cb` symbol + C ABI.
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cb :: (n: i64) -> i64 export "cb" {
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return n + 1;
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}
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// A global-asm trampoline that calls back into `cb`. It saves/restores the link
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// register (x30) around the `bl` — it was itself reached via `bl`, so the return
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// address must survive the nested call.
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asm {
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#string ASM
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.global _caller
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_caller:
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stp x29, x30, [sp, #-16]!
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bl _cb // x0 = cb(x0) — back into sx
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ldp x29, x30, [sp], #16
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ret
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ASM,
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};
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caller :: (n: i64) -> i64 extern;
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main :: () -> i64 {
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return caller(41); // sx main → asm caller → bl _cb → sx cb → 42
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}
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