731fb8de64
12 plain-C examples that use #foreign incidentally (as FFI plumbing, output unchanged): 1200/1206/1209-1215/1220/1221/1222. Blanket keyword swap; all fn/global markers (no class forms in 12xx). Empty snapshot diff; corpus validates directly (all marker'd). Suite green (647 corpus / 444 unit, 0 failed). KEPT on #foreign (deferred to Phase 8 cutover): identity-#foreign feature tests (filename ffi-foreign-*: 1205/1207/1216/1218/1219), the equivalence test 1228, and the diagnostics that assert on #foreign source/message (1172/1174/1620). Comment-only provenance prose (1223/1229/1230/1231) left intact per Decision-6-recommended.
54 lines
2.1 KiB
Plaintext
54 lines
2.1 KiB
Plaintext
// Phase 0 baseline (PLAN-FFI.md step 0.3): structs >16 bytes passed
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// by value into a C `extern` 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 i64
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// Big48 — 48 B, six i64
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#import "modules/std.sx";
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#import c {
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#source "1211-ffi-03-large-struct.c";
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};
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Big24 :: struct { a: i64; b: i64; c: i64; }
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Big48 :: struct {
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a: i64; b: i64; c: i64;
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d: i64; e: i64; f: i64;
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}
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ffi_big24_make :: (a: i64, b: i64, c: i64) -> Big24 extern;
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ffi_big24_rotate :: (v: Big24) -> Big24 extern;
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ffi_big24_sum :: (v: Big24) -> i64 extern;
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ffi_big48_make :: (a: i64, b: i64, c: i64,
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d: i64, e: i64, f: i64) -> Big48 extern;
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ffi_big48_reverse :: (v: Big48) -> Big48 extern;
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ffi_big48_sum :: (v: Big48) -> i64 extern;
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main :: () -> i32 {
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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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