2463eea1d4
90/90 regression tests pass (+ffi-03-large-struct).
vendors/ffi_large_struct/{.h,.c} defines:
Big24 — 24 B, three s64 (byval params + sret return)
Big48 — 48 B, six s64 (same path, larger)
`make / rotate-or-reverse / sum` helpers per shape. The sx-side
example imports via `#source` only and declares matching structs +
hand-written #foreign decls.
Snapshot pins today's >16-byte aggregate ABI now that the
emit_llvm.zig sret-return transform is in place (previous commit).
That gives us a regression net for all four C-ABI aggregate slots
in one place:
≤8 B int — i64 coercion (ffi-01 vec-likes)
9..16 B int — [2 x i64] coercion (ffi-02 Pair64/Quad32, 101)
16 B HFA — struct, no coercion (ffi-02 Vec2/Vec4f)
>16 B — byval params + sret (this commit)
54 lines
2.2 KiB
Plaintext
54 lines
2.2 KiB
Plaintext
// Phase 0 baseline (PLAN-FFI.md step 0.3): structs >16 bytes passed
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// by value into a C `#foreign` fn and returned by value. Exercises
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// the byval-pointer ABI path — the caller copies the struct onto its
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// stack and hands a pointer to the callee; on AAPCS64 the return
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// uses the indirect `x8` register; on SysV AMD64 the return is a
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// hidden first arg pointer that the caller allocates.
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//
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// Distinct from the register-pair / [2 x i64] / HFA paths the
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// small-struct baseline (ffi-02) covers. The two relevant emit_llvm
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// helpers are `needsByval` (returns true when size > 16) and
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// `materializeByvalArg` (alloca + store + pass pointer).
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//
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// Big24 — 24 B, three s64
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// Big48 — 48 B, six s64
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#import "modules/std.sx";
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#import c {
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#source "vendors/ffi_large_struct/ffi_large_struct.c";
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};
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Big24 :: struct { a: s64; b: s64; c: s64; }
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Big48 :: struct {
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a: s64; b: s64; c: s64;
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d: s64; e: s64; f: s64;
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}
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ffi_big24_make :: (a: s64, b: s64, c: s64) -> Big24 #foreign;
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ffi_big24_rotate :: (v: Big24) -> Big24 #foreign;
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ffi_big24_sum :: (v: Big24) -> s64 #foreign;
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ffi_big48_make :: (a: s64, b: s64, c: s64,
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d: s64, e: s64, f: s64) -> Big48 #foreign;
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ffi_big48_reverse :: (v: Big48) -> Big48 #foreign;
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ffi_big48_sum :: (v: Big48) -> s64 #foreign;
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main :: () -> s32 {
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// ── Big24 (24 bytes, byval pointer) ────────────────────────────
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v := ffi_big24_make(1, 2, 3);
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print("big24 make = ({}, {}, {})\n", v.a, v.b, v.c);
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w := ffi_big24_rotate(v);
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print("big24 rotate = ({}, {}, {})\n", w.a, w.b, w.c);
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print("big24 sum = {}\n", ffi_big24_sum(v));
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// ── Big48 (48 bytes, byval pointer) ────────────────────────────
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x := ffi_big48_make(10, 20, 30, 40, 50, 60);
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print("big48 make = ({}, {}, {}, {}, {}, {})\n", x.a, x.b, x.c, x.d, x.e, x.f);
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y := ffi_big48_reverse(x);
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print("big48 reverse = ({}, {}, {}, {}, {}, {})\n", y.a, y.b, y.c, y.d, y.e, y.f);
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print("big48 sum = {}\n", ffi_big48_sum(x));
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0;
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}
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