1 
2 /* Check of variable location identification when using .debug_types.  */
3 
4 /* Relevant compile flags are:
5 
6    -Wall -g -I$prefix/include/valgrind -gdwarf-4 -fdebug-types-section
7 
8    eg -Wall -g -I`pwd`/Inst/include/valgrind -gdwarf-4 -fdebug-types-section
9 */
10 
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <assert.h>
15 #include "tests/sys_mman.h"
16 #include <sys/types.h>
17 #include <sys/stat.h>
18 #include <fcntl.h>
19 #include "memcheck/memcheck.h"
20 
21 /* Cause memcheck to complain about the address "a" and so to print
22    its best guess as to what "a" actually is.*/
23 void croak ( void* aV )
24 {
25   if(VALGRIND_CHECK_MEM_IS_ADDRESSABLE(aV,1) != 0)
26      return;
27   char* a = (char*)aV;
28   char* undefp = malloc(1);
29   char saved = *a;
30   assert(undefp);
31   *a = *undefp;
32   (void) VALGRIND_CHECK_MEM_IS_DEFINED(a, 1);
33   *a = saved;
34   free(undefp);
35 }
36 
37 struct s1
38 {
39   char c;
40   short s;
41   int i;
42   long l;
43   float f;
44   double d;
45 };
46 
47 struct s1 S2[30];
48 
49 int main ( void )
50 {
51   struct s1 local;
52   struct s1* onheap = malloc(sizeof (struct s1));
53   void *p, *q;
54   int fd;
55   int n;
56   char filename[256];
57 
58   assert(onheap);
59   croak(&onheap->i);
60 
61   croak( &S2[0].i );
62   croak( &local.i );
63 
64   /* Describe anonymous mmap-ed */
65   p = mmap( 0, 16 * 1024, PROT_READ|PROT_WRITE,
66             MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 );
67   assert(p != MAP_FAILED);
68   croak( p);
69 
70   /* Describe file mmap-ed */
71   snprintf(filename, sizeof(filename), "./valgrind-dw4-test.%ld",
72            (long) getpid());
73 
74   unlink(filename);
75 
76   fd = open(filename, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
77   assert (fd > 0);
78   n = write(fd, filename, strlen(filename));
79   assert (n > 8);
80   q = mmap(NULL, 100, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
81   assert (q != MAP_FAILED);
82   croak( q);
83   unlink(filename);
84 
85   /* Describe memory in or past the heap end. */
86   void *addr = sbrk(0);
87   croak(addr); // in the first brk page, after brk_limit
88   sbrk(4 * 1024); // increase brk segment
89   croak(addr); // Now, must be inside.
90   addr = (void *) ((char*)addr + 2 * 1024);
91   croak(addr); // Must still be inside.
92   sbrk(-3*1024);
93   croak(addr); // Must now be after.
94 
95   return 0;
96 }
97