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Top Forums Programming C++ Segmentation error with bi-dimensional array Post 302623873 by nmset on Sunday 15th of April 2012 05:56:35 AM
Old 04-15-2012
C++ Segmentation error with bi-dimensional array

Hello,

I'm experiencing a weird seg fault at run time when initializing a bi-dimensional array and initializing a class.
Please see below code and comments describing the error and the instances when it occurs and when it does not occur.

Compiled with
Code:
g++ segf.cpp -o segf

Quote:
g++ --version
output
Quote:
g++ (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2)
On Fedora 16 x86_64
Output of
Code:
sizeof(int)

: 4

Code:
#ifndef __WEIRD_SEG_FAULT__
#define __WEIRD_SEG_FAULT__

class A {
public:
  A(const int _idx);
  
private:
  int m_idx;
};
#endif

A::A(const int _idx) {
  m_idx = _idx;
}

int main() {
  /*
   * If class A is not called at all,
   * no seg fault occurs,
   * with array indices of any size.
   */
  A * a = new A(1);
  /*
   * Below indices do not result in seg error.
   */ 
  //wchar_t t[65536][16];
  
  /*
   * Indices defined as below do not result in seg fault.
   */
  
  /*const int nb = 17;
  wchar_t t[2 ^nb][nb];*/
  
  /*
   * Indices defined as below result in seg fault.
   */ 
  wchar_t t[131072][17];
  
  /*
   * Indices defined as below result in seg fault.
   */ 
  /*const int r = 131072;
  const int c = 17;
  wchar_t t[r][c];*/

  return 0;

}

Any input about what's happening is welcome.

TIA.

Edit : I don't get any errors at all with a previous g++ version
Quote:
g++ (Debian 4.4.5-8) 4.4.5

Last edited by nmset; 04-15-2012 at 04:18 PM..
 

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WMEMCHR(3)						   BSD Library Functions Manual 						WMEMCHR(3)

NAME
wmemchr, wmemcmp, wmemcpy, wmemmove, wmemset, wcpcpy, wcpncpy, wcscasecmp, wcscat, wcschr, wcscmp, wcscpy, wcscspn, wcsdup, wcslcat, wcslcpy, wcslen, wcsncasecmp, wcsncat, wcsncmp, wcsncpy, wcsnlen, wcspbrk, wcsrchr, wcsspn, wcsstr -- wide character string manipulation operations LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <wchar.h> wchar_t * wmemchr(const wchar_t *s, wchar_t c, size_t n); int wmemcmp(const wchar_t *s1, const wchar_t *s2, size_t n); wchar_t * wmemcpy(wchar_t * restrict s1, const wchar_t * restrict s2, size_t n); wchar_t * wmemmove(wchar_t *s1, const wchar_t *s2, size_t n); wchar_t * wmemset(wchar_t *s, wchar_t c, size_t n); wchar_t * wcpcpy(wchar_t *s1, wchar_t *s2); wchar_t * wcpncpy(wchar_t *s1, wchar_t *s2, size_t n); int wcscasecmp(const wchar_t *s1, const wchar_t *s2); wchar_t * wcscat(wchar_t * restrict s1, const wchar_t * restrict s2); wchar_t * wcschr(const wchar_t *s, wchar_t c); int wcscmp(const wchar_t *s1, const wchar_t *s2); wchar_t * wcscpy(wchar_t * restrict s1, const wchar_t * restrict s2); size_t wcscspn(const wchar_t *s1, const wchar_t *s2); wchar_t * wcsdup(const wchar_t *s); size_t wcslcat(wchar_t *s1, const wchar_t *s2, size_t n); size_t wcslcpy(wchar_t *s1, const wchar_t *s2, size_t n); size_t wcslen(const wchar_t *s); int wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n); wchar_t * wcsncat(wchar_t * restrict s1, const wchar_t * restrict s2, size_t n); int wcsncmp(const wchar_t *s1, const wchar_t * s2, size_t n); wchar_t * wcsncpy(wchar_t * restrict s1, const wchar_t * restrict s2, size_t n); size_t wcsnlen(const wchar_t *s, size_t maxlen); wchar_t * wcspbrk(const wchar_t *s1, const wchar_t *s2); wchar_t * wcsrchr(const wchar_t *s, wchar_t c); size_t wcsspn(const wchar_t *s1, const wchar_t *s2); wchar_t * wcsstr(const wchar_t * restrict s1, const wchar_t * restrict s2); DESCRIPTION
The functions implement string manipulation operations over wide character strings. For a detailed description, refer to documents for the respective single-byte counterpart, such as memchr(3). SEE ALSO
memchr(3), memcmp(3), memcpy(3), memmove(3), memset(3), stpcpy(3), stpncpy(3), strcasecmp(3), strcat(3), strchr(3), strcmp(3), strcpy(3), strcspn(3), strdup(3), strlcat(3), strlcpy(3), strlen(3), strncat(3), strncmp(3), strncpy(3), strnlen(3), strpbrk(3), strrchr(3), strspn(3), strstr(3) STANDARDS
These functions conform to ISO/IEC 9899:1999 (``ISO C99''), with the exception of wcpcpy(), wcpncpy(), wcscasecmp(), wcsdup(), wcsncasecmp(), and wcsnlen(), which conform to IEEE Std 1003.1-2008 (``POSIX.1''); and wcslcat() and wcslcpy(), which are extensions. BSD
March 4, 2009 BSD
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