tests/tests2/119_random_stuff.c

   1 #include <stdio.h>
   2
   3 struct big_struct { char a[262144]; };
   4
   5 static const char str[] = "abcdefghijklmnopqrstuvwxyz";
   6
   7 void tst_branch(void)
   8 {
   9   printf("tst_branch --");
  10   goto *&&a;
  11   printf (" dummy");
  12 a: ;
  13   printf(" --\n");
  14 }
  15
  16 void tst_void_ptr(void *pv, int i)
  17 {
  18   i ? *pv : *pv; // dr106
  19 }
  20
  21 void tst_shift(void)
  22 {
  23   int i = 1;
  24   long long l = 1;
  25   i = i << 32; // illegal. just test
  26   l = l << 64; // illegal. just test
  27 }
  28
  29 #if !defined(_WIN32)
  30 #include <sys/mman.h>
  31
  32 void tst_const_addr(void)
  33 {
  34   void *addr = mmap ((void *)0x20000000, 4096, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_ANONYMOUS, -1, 0);
  35   if (addr != (void *) -1) {
  36 #if !defined(__riscv)
  37     *(int *)0x20000000 += 42;
  38 #endif
  39     munmap (addr, 4096);
  40   }
  41 }
  42 #endif
  43
  44 struct zero_struct {};
  45
  46 struct zero_struct tst_zero_struct(void)
  47 {
  48   struct zero_struct ret;
  49   return ret;
  50 }
  51
  52 struct big_struct tst_big(struct big_struct tst)
  53 {
  54    return tst;
  55 }
  56
  57 void tst_adr (int (*fp)(char *, const char *, ...))
  58 {
  59   char buf[10];
  60   (*fp)(buf, "%.0f", 5.0);
  61   printf("tst_adr %s\n", buf);
  62 }
  63
  64 int tst(void)
  65 {
  66   long long value = 3;
  67   return -value;
  68 }
  69
  70 void tst_compare(void)
  71 {
  72   /* This failed on risc64 */
  73   printf ("tst_compare: %s\n", tst() > 0 ? "error" : "ok");
  74 }
  75
  76 #pragma pack(1)
  77 struct S { int d:24; int f:14; } i, j;
  78 #pragma pack()
  79
  80 void tst_pack (void)
  81 {
  82   i.f = 5; j.f = 5;
  83   printf("tst_pack: j.f = %d, i.f = %d\n", j.f, i.f);
  84 }
  85
  86 void tst_cast(void)
  87 {
  88   signed char c = (signed char) 0xaaaaaaaa;
  89   int r = (unsigned short) c ^ (signed char) 0x99999999;
  90   printf ("schar to ushort cast: %x\n", r);
  91 }
  92
  93 int
  94 main (void)
  95 {
  96   struct big_struct big;
  97
  98   tst_branch();
  99   tst_shift();
 100   tst_void_ptr(&big.a[0], 0);
 101 #if !defined(_WIN32)
 102   tst_const_addr();
 103 #endif
 104   tst_zero_struct();
 105   tst_big(big);
 106   tst_adr(&sprintf);
 107   tst_compare();
 108   tst_pack();
 109   tst_cast();
 110 }