gcc/testsuite/gcc.target/msp430/data-attributes.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2" } */
   3
   4 /* This test checks that persistent and noinit data are handled correctly.  */
   5
   6 extern void __crt0_start (void) __attribute__ ((noreturn));
   7 extern void abort (void) __attribute__ ((noreturn));
   8 extern void exit (int) __attribute__ ((noreturn));
   9
  10 int a;
  11 int b = 0;
  12 int c = 1;
  13 int __attribute__((noinit)) d;
  14 int __attribute__((persistent)) e = 2;
  15
  16 int
  17 main (void)
  18 {
  19   /* Make sure that the C startup code has correctly initialised the ordinary variables.  */
  20   if (a != 0)
  21     abort ();
  22
  23 #ifndef __MSP430X_LARGE__
  24   /* For non-large targets we use the ordinary msp430-sim.ld linker script.
  25      This does not support FLASH, and as a side effect it does not support
  26      reinitialising initialised data.  Hence we only test b and c if this
  27      is the first time through this test, or large support has been enabled.  */
  28   if (e == 2)
  29 #endif
  30   if (b != 0 || c != 1)
  31     abort ();
  32
  33   switch (e)
  34     {
  35     case 2:
  36       /* First time through - change all the values.  */
  37       a = b = c = d = e = 3;
  38       break;
  39
  40     case 3:
  41       /* Second time through - make sure that d has not been reset.  */
  42       if (d != 3)
  43         abort ();
  44       exit (0);
  45
  46     default:
  47       /* Any other value for e is an error.  */
  48       abort ();
  49     }
  50
  51   /* Simulate a processor reset by calling the C startup code.  */
  52   __crt0_start ();
  53
  54   /* Should never reach here.  */
  55   abort ();
  56 }