gcc/ada/tb-ivms.c

   1 /****************************************************************************
   2  *                                                                          *
   3  *                         GNAT COMPILER COMPONENTS                         *
   4  *                                                                          *
   5  *                 T R A C E B A C K - I t a n i u m  / V M S               *
   6  *                                                                          *
   7  *                          C Implementation File                           *
   8  *                                                                          *
   9  *                     Copyright (C) 2007, AdaCore                          *
  10  *                                                                          *
  11  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  12  * terms of the  GNU General Public License as published  by the Free Soft- *
  13  * ware  Foundation;  either version 2,  or (at your option) any later ver- *
  14  * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
  15  * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License *
  17  * for  more details.  You should have  received  a copy of the GNU General *
  18  * Public License  distributed with GNAT;  see file COPYING.  If not, write *
  19  * to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, *
  20  * Boston, MA 02110-1301, USA.                                              *
  21  *                                                                          *
  22  * As a  special  exception,  if you  link  this file  with other  files to *
  23  * produce an executable,  this file does not by itself cause the resulting *
  24  * executable to be covered by the GNU General Public License. This except- *
  25  * ion does not  however invalidate  any other reasons  why the  executable *
  26  * file might be covered by the  GNU Public License.                        *
  27  *                                                                          *
  28  * GNAT was originally developed  by the GNAT team at  New York University. *
  29  * Extensive contributions were provided by Ada Core Technologies Inc.      *
  30  *                                                                          *
  31  ****************************************************************************/
  32
  33 /* Itanium Open/VMS implementation of backtrace.  Use ICB (Invocation
  34    Context Block) routines.  */
  35 #include <stdlib.h>
  36 #include <vms/libicb.h>
  37
  38 /* Declare libicb routines.  */
  39 extern INVO_CONTEXT_BLK *LIB$I64_CREATE_INVO_CONTEXT (void *(*)(size_t),
  40                                                       void (*)(void *),
  41                                                       int);
  42 extern void LIB$I64_FREE_INVO_CONTEXT (INVO_CONTEXT_BLK *);
  43 extern int LIB$I64_GET_CURR_INVO_CONTEXT(INVO_CONTEXT_BLK *);
  44 extern int LIB$I64_GET_PREV_INVO_CONTEXT(INVO_CONTEXT_BLK *);
  45
  46 /* Gcc internal headers poison malloc.  So use xmalloc() when building the
  47    compiler.  */
  48 #ifdef IN_RTS
  49 #define BT_MALLOC malloc
  50 #else
  51 #define BT_MALLOC xmalloc
  52 #endif
  53
  54 int
  55 __gnat_backtrace (void **array, int size,
  56                   void *exclude_min, void *exclude_max, int skip_frames)
  57 {
  58   INVO_CONTEXT_BLK *ctxt;
  59   int res = 0;
  60   int n = 0;
  61
  62   /* Create the context.  */
  63   ctxt = LIB$I64_CREATE_INVO_CONTEXT (BT_MALLOC, free, 0);
  64   if (ctxt == NULL)
  65     return 0;
  66
  67   LIB$I64_GET_CURR_INVO_CONTEXT (ctxt);
  68
  69   while (1)
  70     {
  71       void *pc = (void *)ctxt->libicb$ih_pc;
  72       if (pc == (void *)0)
  73         break;
  74       if (ctxt->libicb$v_bottom_of_stack)
  75         break;
  76       if (n >= skip_frames && (pc < exclude_min || pc > exclude_max))
  77         {
  78           array[res++] = (void *)(ctxt->libicb$ih_pc);
  79           if (res == size)
  80             break;
  81         }
  82       n++;
  83       LIB$I64_GET_PREV_INVO_CONTEXT (ctxt);
  84     }
  85
  86   /* Free the context.  */
  87   LIB$I64_FREE_INVO_CONTEXT (ctxt);
  88   return res;
  89 }