From 55bcc47717bb0f9c5276a45710d757cda7a61f8e Mon Sep 17 00:00:00 2001
From: Anthony Green <green@moxielogic.com>
Date: Sat, 24 Sep 2022 22:03:52 -0400
Subject: Test idea borrowed from cpython

---
 testsuite/libffi.call/struct_return_8H.c | 90 ++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 testsuite/libffi.call/struct_return_8H.c

diff --git a/testsuite/libffi.call/struct_return_8H.c b/testsuite/libffi.call/struct_return_8H.c
new file mode 100644
index 0000000..5018daa
--- /dev/null
+++ b/testsuite/libffi.call/struct_return_8H.c
@@ -0,0 +1,90 @@
+/* Area:	ffi_call
+   Purpose:	Check structures.
+   Limitations:	none.
+   PR:		none.
+   Originator:	From the original ffitest.c  */
+
+/* { dg-do run } */
+#include "ffitest.h"
+typedef struct
+{
+  int a;
+  int b;
+  int c;
+  int d;
+  int e;
+  int f;
+  int g;
+  int h;
+} test_structure_5;
+
+static test_structure_5 ABI_ATTR struct5(test_structure_5 inp)
+{
+  inp.a *= 2;
+  inp.b *= 3;
+  inp.c *= 4;
+  inp.d *= 5;
+  inp.e *= 6;
+  inp.f *= 7;
+  inp.g *= 8;
+  inp.h *= 9;
+  return inp;
+}
+
+int main (void)
+{
+  ffi_cif cif;
+  ffi_type *args[MAX_ARGS];
+  void *values[MAX_ARGS];
+  ffi_type ts5_type;
+  ffi_type *ts5_type_elements[9];
+
+  test_structure_5 ts5_arg1;
+
+  /* This is a hack to get a properly aligned result buffer */
+  test_structure_5 *ts5_result =
+    (test_structure_5 *) malloc (sizeof(test_structure_5));
+
+  ts5_type.size = 0;
+  ts5_type.alignment = 0;
+  ts5_type.type = FFI_TYPE_STRUCT;
+  ts5_type.elements = ts5_type_elements;
+  ts5_type_elements[0] = &ffi_type_sint;
+  ts5_type_elements[1] = &ffi_type_sint;
+  ts5_type_elements[2] = &ffi_type_sint;
+  ts5_type_elements[3] = &ffi_type_sint;
+  ts5_type_elements[4] = &ffi_type_sint;
+  ts5_type_elements[5] = &ffi_type_sint;
+  ts5_type_elements[6] = &ffi_type_sint;
+  ts5_type_elements[7] = &ffi_type_sint;
+  ts5_type_elements[8] = NULL;
+
+  args[0] = &ts5_type;
+  values[0] = &ts5_arg1;
+
+  /* Initialize the cif */
+  CHECK(ffi_prep_cif(&cif, ABI_NUM, 1, &ts5_type, args) == FFI_OK);
+
+  ts5_arg1.a = 9;
+  ts5_arg1.b = 8;
+  ts5_arg1.c = 7;
+  ts5_arg1.d = 6;
+  ts5_arg1.e = 5;
+  ts5_arg1.f = 4;
+  ts5_arg1.g = 3;
+  ts5_arg1.h = 2;
+
+  ffi_call (&cif, FFI_FN(struct5), ts5_result, values);
+
+  CHECK(ts5_result->a == 9*2);
+  CHECK(ts5_result->b == 8*3);
+  CHECK(ts5_result->c == 7*4);
+  CHECK(ts5_result->d == 6*5);
+  CHECK(ts5_result->e == 5*6);
+  CHECK(ts5_result->f == 4*7);
+  CHECK(ts5_result->g == 3*8);
+  CHECK(ts5_result->h == 2*9);
+
+  free (ts5_result);
+  exit(0);
+}
-- 
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