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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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d1b502efef
segment if it is past the heap end Describes specifically an address that is in the brk data segment or in the 'reduced' (after brk reduction) section of the brk data segment. Based on a patch from Ivo Raisr. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14833
97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
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/* Check of variable location identification when using .debug_types. */
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/* Relevant compile flags are:
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-Wall -g -I$prefix/include/valgrind -gdwarf-4 -fdebug-types-section
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eg -Wall -g -I`pwd`/Inst/include/valgrind -gdwarf-4 -fdebug-types-section
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "tests/sys_mman.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "memcheck/memcheck.h"
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/* Cause memcheck to complain about the address "a" and so to print
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its best guess as to what "a" actually is.*/
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void croak ( void* aV )
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{
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if(VALGRIND_CHECK_MEM_IS_ADDRESSABLE(aV,1) != 0)
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return;
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char* a = (char*)aV;
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char* undefp = malloc(1);
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char saved = *a;
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assert(undefp);
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*a = *undefp;
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(void) VALGRIND_CHECK_MEM_IS_DEFINED(a, 1);
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*a = saved;
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free(undefp);
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}
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struct s1
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{
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char c;
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short s;
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int i;
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long l;
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float f;
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double d;
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};
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struct s1 S2[30];
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int main ( void )
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{
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struct s1 local;
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struct s1* onheap = malloc(sizeof (struct s1));
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void *p, *q;
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int fd;
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int n;
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char filename[256];
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assert(onheap);
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croak(&onheap->i);
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croak( &S2[0].i );
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croak( &local.i );
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/* Describe anonymous mmap-ed */
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p = mmap( 0, 16 * 1024, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 );
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assert(p != MAP_FAILED);
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croak( p);
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/* Describe file mmap-ed */
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snprintf(filename, sizeof(filename), "./valgrind-dw4-test.%d",
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getpid());
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unlink(filename);
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fd = open(filename, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
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assert (fd > 0);
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n = write(fd, filename, strlen(filename));
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assert (n > 8);
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q = mmap(NULL, 100, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
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assert (q != MAP_FAILED);
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croak( q);
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unlink(filename);
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/* Describe memory in or past the heap end. */
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void *addr = sbrk(0);
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croak(addr); // in the first brk page, after brk_limit
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sbrk(4 * 1024); // increase brk segment
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croak(addr); // Now, must be inside.
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addr = (void *) ((char*)addr + 2 * 1024);
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croak(addr); // Must still be inside.
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sbrk(-3*1024);
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croak(addr); // Must now be after.
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return 0;
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}
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