gcc/ada/tb-ivms.c

   1 /****************************************************************************
   2  *                                                                          *
   3  *                         GNAT RUN-TIME 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) 2007-2011, 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 3,  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.                                     *
  17  *                                                                          *
  18  * As a special exception under Section 7 of GPL version 3, you are granted *
  19  * additional permissions described in the GCC Runtime Library Exception,   *
  20  * version 3.1, as published by the Free Software Foundation.               *
  21  *                                                                          *
  22  * You should have received a copy of the GNU General Public License and    *
  23  * a copy of the GCC Runtime Library Exception along with this program;     *
  24  * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *
  25  * <http://www.gnu.org/licenses/>.                                          *
  26  *                                                                          *
  27  * GNAT was originally developed  by the GNAT team at  New York University. *
  28  * Extensive contributions were provided by Ada Core Technologies Inc.      *
  29  *                                                                          *
  30  ****************************************************************************/
  31
  32 /* Itanium Open/VMS implementation of backtrace.  Use ICB (Invocation
  33    Context Block) routines.  */
  34 #include <stdlib.h>
  35 #include <vms/libicb.h>
  36
  37 /* Declare libicb routines.  */
  38 extern INVO_CONTEXT_BLK *LIB$I64_CREATE_INVO_CONTEXT (void *(*)(size_t),
  39                                                       void (*)(void *),
  40                                                       int);
  41 extern void LIB$I64_FREE_INVO_CONTEXT (INVO_CONTEXT_BLK *);
  42 extern int LIB$I64_GET_CURR_INVO_CONTEXT(INVO_CONTEXT_BLK *);
  43 extern int LIB$I64_GET_PREV_INVO_CONTEXT(INVO_CONTEXT_BLK *);
  44
  45 /* Gcc internal headers poison malloc.  So use xmalloc() when building the
  46    compiler.  */
  47 #ifdef IN_RTS
  48 #define BT_MALLOC malloc
  49 #else
  50 #define BT_MALLOC xmalloc
  51 #endif
  52
  53 int
  54 __gnat_backtrace (void **array, int size,
  55                   void *exclude_min, void *exclude_max, int skip_frames)
  56 {
  57   INVO_CONTEXT_BLK *ctxt;
  58   int res = 0;
  59   int n = 0;
  60
  61   /* Create the context.  */
  62   ctxt = LIB$I64_CREATE_INVO_CONTEXT (BT_MALLOC, free, 0);
  63   if (ctxt == NULL)
  64     return 0;
  65
  66   LIB$I64_GET_CURR_INVO_CONTEXT (ctxt);
  67
  68   while (1)
  69     {
  70       void *pc = (void *)ctxt->libicb$ih_pc;
  71       if (pc == (void *)0)
  72         break;
  73       if (ctxt->libicb$v_bottom_of_stack)
  74         break;
  75       if (n >= skip_frames && (pc < exclude_min || pc > exclude_max))
  76         {
  77           array[res++] = (void *)(ctxt->libicb$ih_pc);
  78           if (res == size)
  79             break;
  80         }
  81       n++;
  82       LIB$I64_GET_PREV_INVO_CONTEXT (ctxt);
  83     }
  84
  85   /* Free the context.  */
  86   LIB$I64_FREE_INVO_CONTEXT (ctxt);
  87   return res;
  88 }