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Full Discussion: Array alignment on HPUX
Top Forums Programming Array alignment on HPUX Post 302145047 by rimon on Monday 12th of November 2007 03:04:45 PM
Old 11-12-2007
Array alignment on HPUX
Hi,

I'm porting code from Windows to HP-UX 11.23, using gcc (I'm begining to suspect this might not be the best choice, but I thought it would be most compatible since we've already compiled on Linux with gcc).

I have in my code something similar to the folowing:
Code:
unsigned char *ch_arr = new (unsigned char)[20];
unsigned char ptr = ch_arr + 10;
unsigned int number = 100;

*((unsigned int *)ptr - 1) = number;

The last line gives a segmentation fault.
In fact, I have found that its enough to write the following in order to crash:
Code:
unsigned char *ch_arr = new (unsigned char)[20];
unsigned int number = 100;

ch_arr[2] = number;

And the same is true for any index in the array which does not divide by 4.
I assume this is an alignment problem. If I were writing new code I could work around it, but since I am porting code this is a problem. Apparently the code uses this type of code, treating char arrays as memory buffers for different types, in many places and it would be very difficult to find them all and fix them.

Is there any compilation flag that could change the alignment for me?
Any other ideas for a global fix for this?

Thanks!

RO
 

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LEARN ABOUT DEBIAN

hwloc_topology_membind_support

hwloc_topology_membind_support(3)			     Hardware Locality (hwloc)				 hwloc_topology_membind_support(3)

NAME

       hwloc_topology_membind_support -

SYNOPSIS

       #include <hwloc.h>

   Data Fields
       unsigned char set_thisproc_membind
       unsigned char get_thisproc_membind
       unsigned char set_proc_membind
       unsigned char get_proc_membind
       unsigned char set_thisthread_membind
       unsigned char get_thisthread_membind
       unsigned char set_area_membind
       unsigned char get_area_membind
       unsigned char alloc_membind
       unsigned char firsttouch_membind
       unsigned char bind_membind
       unsigned char interleave_membind
       unsigned char replicate_membind
       unsigned char nexttouch_membind
       unsigned char migrate_membind

Detailed Description
       Flags describing actual memory binding support for this topology.

Field Documentation
   unsigned char hwloc_topology_membind_support::alloc_membind Allocating a bound memory area is supported.
   unsigned char hwloc_topology_membind_support::bind_membind Bind policy is supported.
   unsigned char hwloc_topology_membind_support::firsttouch_membind First-touch policy is supported.
   unsigned char hwloc_topology_membind_support::get_area_membind Getting the binding of a given memory area is supported.
   unsigned char hwloc_topology_membind_support::get_proc_membind Getting the binding of a whole given process is supported.
   unsigned char hwloc_topology_membind_support::get_thisproc_membind Getting the binding of the whole current process is supported.
   unsigned char hwloc_topology_membind_support::get_thisthread_membind Getting the binding of the current thread only is supported.
   unsigned char hwloc_topology_membind_support::interleave_membind Interleave policy is supported.
   unsigned char hwloc_topology_membind_support::migrate_membind Migration flags is supported.
   unsigned char hwloc_topology_membind_support::nexttouch_membind Next-touch migration policy is supported.
   unsigned char hwloc_topology_membind_support::replicate_membind Replication policy is supported.
   unsigned char hwloc_topology_membind_support::set_area_membind Binding a given memory area is supported.
   unsigned char hwloc_topology_membind_support::set_proc_membind Binding a whole given process is supported.
   unsigned char hwloc_topology_membind_support::set_thisproc_membind Binding the whole current process is supported.
   unsigned char hwloc_topology_membind_support::set_thisthread_membind Binding the current thread only is supported.
Author
       Generated automatically by Doxygen for Hardware Locality (hwloc) from the source code.

Version 1.4.1							  Mon Feb 27 2012				 hwloc_topology_membind_support(3)
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