Issue #8275: Fix passing of callback arguments with ctypes under Win64.

Patch by Stan Mihai. Ok'ed by Georg.

2 files changed, 15 insertions, 1 deletions

diff --git a/Modules/_ctypes/_ctypes_test.c b/Modules/_ctypes/_ctypes_test.c
index 36bd0a1..3a6845f 100644
--- a/Modules/_ctypes/_ctypes_test.c
+++ b/Modules/_ctypes/_ctypes_test.c
@@ -12,6 +12,20 @@
 
 /* some functions handy for testing */
 
+EXPORT(int)
+_testfunc_cbk_reg_int(int a, int b, int c, int d, int e,
+                      int (*func)(int, int, int, int, int))
+{
+    return func(a*a, b*b, c*c, d*d, e*e);
+}
+
+EXPORT(double)
+_testfunc_cbk_reg_double(double a, double b, double c, double d, double e,
+                         double (*func)(double, double, double, double, double))
+{
+    return func(a*a, b*b, c*c, d*d, e*e);
+}
+
 EXPORT(void)testfunc_array(int values[4])
 {
     printf("testfunc_array %d %d %d %d\n",
diff --git a/Modules/_ctypes/libffi_msvc/ffi.c b/Modules/_ctypes/libffi_msvc/ffi.c
index 5df4ba4..6e595e9 100644
--- a/Modules/_ctypes/libffi_msvc/ffi.c
+++ b/Modules/_ctypes/libffi_msvc/ffi.c
@@ -380,7 +380,7 @@ ffi_prep_closure_loc (ffi_closure* closure,
   short bytes;
   char *tramp;
 #ifdef _WIN64
-  int mask;
+  int mask = 0;
 #endif
   FFI_ASSERT (cif->abi == FFI_SYSV);