sdcc/support/regression/tests/bug-3260.c

   1 #include <testfwk.h>
   2
   3 /* Bug #3260 caused typecast function pointers to pass all */
   4 /* parameters via the stack and not pass any parameter via  */
   5 /* register, even when some should have been passed via    */
   6 /* register. */
   7
   8 /* Look for __SDCC_STACK_AUTO to make sure the port is     */
   9 /* parameters in registers and/or stack and not statically */
  10 #if defined(__SDCC_STACK_AUTO) || defined(PORT_HOST)
  11 int (*p)(int, int) __reentrant;
  12
  13 void (*q)(void) __reentrant;
  14
  15 int f(void)
  16 {
  17     return (*p)(23, 42);
  18 }
  19
  20 int g(void)
  21 {
  22     return (*(((int (*)(int, int))q)))(23, 42);
  23 }
  24
  25 int c(int a, int b) __reentrant
  26 {
  27     return a - b;
  28 }
  29 #endif
  30
  31 void
  32 testBug(void)
  33 {
  34 #if defined(__SDCC_STACK_AUTO) || defined(PORT_HOST)
  35     p = &c;
  36     q = (void (*)(void))(&c);
  37     ASSERT (f() == 23 - 42);
  38     ASSERT (g() == 23 - 42);
  39 #endif
  40 }
  41