sdcc/support/regression/tests/bug-3283.c

   1 /*
   2    bug-3283.c. On z80, a variable allocated to iy was overwritten by the use of iy for an address at a cast.
   3  */
   4
   5 #include <testfwk.h>
   6
   7 #pragma disable_warning 85
   8
   9 typedef struct object_d {
  10     unsigned char code;
  11     char *desc;
  12     unsigned int position;
  13     unsigned char attributes;
  14 } object;
  15
  16
  17 object *odummy;
  18 unsigned char current_position;
  19
  20 char *message1006;
  21 char *message1005;
  22
  23 extern object *search_object_p(unsigned int o);
  24 extern void show_message(const char *m);
  25
  26 unsigned char get(unsigned int o)
  27 {
  28     odummy=search_object_p(o); // odummy in iy.
  29     if(odummy->position!=current_position) { // a cast from unsigned char to unsigned int here used iy to point to current_position.
  30         show_message(message1006);
  31     } else if((odummy->attributes&1)==0) {
  32         show_message(message1005);
  33     } else {
  34         odummy->position=1500; // odummy used again here.
  35         return 0;
  36     }
  37     return 1;
  38 }
  39
  40 object obj = {0, 0, 0, 1};
  41
  42 void
  43 testBug (void)
  44 {
  45     ASSERT(!get(0));
  46     ASSERT(obj.position==1500);
  47 }
  48
  49 object *search_object_p(unsigned int o)
  50 {
  51     return &obj;
  52 }
  53
  54 void show_message(const char *m)
  55 {
  56     ASSERT (0);
  57 }
  58