Tests in abitest.c now work on Win32.

I expect that Linux-x86 is probably fine. All other architectures
except ARM are definitely broken since I haven't yet implemented
gfunc_sret for these, although replicating the current behaviour
should be straightforward.

tests/abitest.c

@@ -37,24 +37,62 @@ static int run_callback(const char *src, callback_type callback) {
   return result;
 }
 
-typedef struct test1_type_s {int x, y;} test1_type;
-typedef test1_type (*test1_function_type) ();
+/*
+ * reg_pack_test: return a small struct which should be packed into
+ * registers (Win32) during return.
+ */
+typedef struct reg_pack_test_type_s {int x, y;} reg_pack_test_type;
+typedef reg_pack_test_type (*reg_pack_test_function_type) (reg_pack_test_type);
 
-static int test1_callback(void *ptr) {
-  test1_type r;
-  r  = ((test1_function_type)ptr)();
-  return ((r.x == 10) && (r.y == 35)) ? 0 : -1;
+static int reg_pack_test_callback(void *ptr) {
+  reg_pack_test_function_type f = (reg_pack_test_function_type)ptr;
+  reg_pack_test_type a = {10, 35};
+  reg_pack_test_type r;
+  r = f(a);
+  return ((r.x == a.x*5) && (r.y == a.y*3)) ? 0 : -1;
 }
 
-static int test1() {
+static int reg_pack_test(void) {
   const char *src =
-  "typedef struct test1_type_s {int x, y;} test1_type;"
-  "test1_type f() {\n"
-  "  test1_type r = {10, 35};\n"
+  "typedef struct reg_pack_test_type_s {int x, y;} reg_pack_test_type;"
+  "reg_pack_test_type f(reg_pack_test_type a) {\n"
+  "  reg_pack_test_type r = {a.x*5, a.y*3};\n"
   "  return r;\n"
   "}\n";
   
-  return run_callback(src, test1_callback);
+  return run_callback(src, reg_pack_test_callback);
+}
+
+/*
+ * sret_test: Create a struct large enough to be returned via sret
+ * (hidden pointer as first function argument)
+ */
+typedef struct sret_test_type_s {
+  long long a;
+  long long b;
+} sret_test_type;
+
+typedef sret_test_type (*sret_test_function_type) (sret_test_type);
+
+static int sret_test_callback(void *ptr) {
+  sret_test_function_type f = (sret_test_function_type)(ptr);
+  sret_test_type x = {5436LL, 658277698LL};
+  sret_test_type r = f(x);
+  return ((r.a==x.a*35)&&(r.b==x.b*19)) ? 0 : -1;
+}
+
+static int sret_test(void) {
+  const char *src =
+  "typedef struct sret_test_type_s {\n"
+  "  long long a;\n"
+  "  long long b;\n"
+  "} sret_test_type;\n"
+  "sret_test_type f(sret_test_type x) {\n"
+  "  sret_test_type r = {x.a*35, x.b*19};\n"
+  "  return r;\n"
+  "}\n";
+  
+  return run_callback(src, sret_test_callback);
 }
 
 #define RUN_TEST(t) \
@@ -75,6 +113,7 @@ int main(int argc, char **argv) {
   if (argc == 2 && !memcmp(argv[1], "lib_path=",9))
     tccdir = argv[1] + 9;
   
-  RUN_TEST(test1);
+  RUN_TEST(reg_pack_test);
+  RUN_TEST(sret_test);
   return retval;
 }