From 45da2fcbcd0ecaba673275d22b04fac3e4376e22 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyfox@gentoo.org>
Date: Sat, 17 Feb 2018 18:53:02 +0000
Subject: [PATCH] new test: return small struct

The bug originally was discovered in https://bugs.gentoo.org/634190
where complicated callback was returning invalid data on ia64.

This change adds minimal reproducer that fails only on ia64 as:

FAIL: libffi.call/struct10.c -W -Wall -Wno-psabi -O0 execution test
FAIL: libffi.call/struct10.c -W -Wall -Wno-psabi -O2 execution test
FAIL: libffi.call/struct10.c -W -Wall -Wno-psabi -O3 execution test
FAIL: libffi.call/struct10.c -W -Wall -Wno-psabi -Os execution test

Test passes on amd64. The fix is in the following commit.

Bug: https://bugs.gentoo.org/634190
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
---
 testsuite/Makefile.am            |  1 +
 testsuite/libffi.call/struct10.c | 57 ++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 testsuite/libffi.call/struct10.c

diff --git a/testsuite/Makefile.am b/testsuite/Makefile.am
index 5eecc575..b367b46f 100644
--- a/testsuite/Makefile.am
+++ b/testsuite/Makefile.am
@@ -68,6 +68,7 @@ libffi.call/float4.c \
 libffi.call/return_ldl.c \
 libffi.call/closure_fn5.c \
 libffi.call/struct6.c libffi.call/return_ll.c libffi.call/struct9.c	\
+libffi.call/struct10.c \
 libffi.call/return_sc.c libffi.call/struct7.c				\
 libffi.call/cls_align_uint64.c libffi.call/cls_4byte.c			\
 libffi.call/cls_6_1_byte.c			\
diff --git a/testsuite/libffi.call/struct10.c b/testsuite/libffi.call/struct10.c
new file mode 100644
index 00000000..17b13774
--- /dev/null
+++ b/testsuite/libffi.call/struct10.c
@@ -0,0 +1,57 @@
+/* Area:	ffi_call
+   Purpose:	Check structures.
+   Limitations:	none.
+   PR:		none.
+   Originator:	Sergei Trofimovich <slyfox@gentoo.org>
+
+   The test originally discovered in ruby's bindings
+   for ffi in https://bugs.gentoo.org/634190  */
+
+/* { dg-do run } */
+#include "ffitest.h"
+
+struct s {
+  int s32;
+  float f32;
+  signed char s8;
+};
+
+struct s make_s(void) {
+  struct s r;
+  r.s32 = 0x1234;
+  r.f32 = 7.0;
+  r.s8  = 0x78;
+  return r;
+}
+
+int main() {
+  ffi_cif cif;
+  struct s r;
+  ffi_type rtype;
+  ffi_type* s_fields[] = {
+    &ffi_type_sint,
+    &ffi_type_float,
+    &ffi_type_schar,
+    NULL,
+  };
+
+  rtype.size      = 0;
+  rtype.alignment = 0,
+  rtype.type      = FFI_TYPE_STRUCT,
+  rtype.elements  = s_fields,
+
+  r.s32 = 0xbad;
+  r.f32 = 999.999;
+  r.s8  = 0x51;
+
+  // Here we emulate the following call:
+  //r = make_s();
+
+  CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 0, &rtype, NULL) == FFI_OK);
+  ffi_call(&cif, FFI_FN(make_s), &r, NULL);
+
+  CHECK(r.s32 == 0x1234);
+  CHECK(r.f32 == 7.0);
+  CHECK(r.s8  == 0x78);
+  exit(0);
+}