gcc/ada/gmem.c

   1 /****************************************************************************
   2  *                                                                          *
   3  *                            GNATMEM COMPONENTS                            *
   4  *                                                                          *
   5  *                                 G M E M                                  *
   6  *                                                                          *
   7  *                             $Revision$
   8  *                                                                          *
   9  *                          C Implementation File                           *
  10  *                                                                          *
  11  *         Copyright (C) 2000-2001 Free Software Foundation, Inc.           *
  12  *                                                                          *
  13  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  14  * terms of the  GNU General Public License as published  by the Free Soft- *
  15  * ware  Foundation;  either version 2,  or (at your option) any later ver- *
  16  * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
  17  * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
  18  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License *
  19  * for  more details.  You should have  received  a copy of the GNU General *
  20  * Public License  distributed with GNAT;  see file COPYING.  If not, write *
  21  * to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, *
  22  * MA 02111-1307, USA.                                                      *
  23  *                                                                          *
  24  * As a  special  exception,  if you  link  this file  with other  files to *
  25  * produce an executable,  this file does not by itself cause the resulting *
  26  * executable to be covered by the GNU General Public License. This except- *
  27  * ion does not  however invalidate  any other reasons  why the  executable *
  28  * file might be covered by the  GNU Public License.                        *
  29  *                                                                          *
  30  * GNAT was originally developed  by the GNAT team at  New York University. *
  31  * It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). *
  32  *                                                                          *
  33  ****************************************************************************/
  34
  35 /*  This unit reads the allocation tracking log produced by augmented
  36     __gnat_malloc and __gnat_free procedures (see file a-raise.c) and
  37     provides GNATMEM tool with gdb-compliant output. The output is
  38     processed by GNATMEM to detect dynamic memory allocation errors.
  39
  40     See GNATMEM section in GNAT User's Guide for more information.
  41
  42     NOTE: This capability is currently supported on the following targets:
  43
  44       DEC Unix
  45       SGI Irix
  46       GNU/Linux x86
  47       Solaris (sparc and x86) (*)
  48       Windows 98/95/NT (x86)
  49
  50     (*) on these targets, the compilation must be done with -funwind-tables to
  51     be able to build the stack backtrace.   */
  52
  53 #ifdef __alpha_vxworks
  54 #include "vxWorks.h"
  55 #endif
  56
  57 #ifdef IN_RTS
  58 #include "tconfig.h"
  59 #include "tsystem.h"
  60 #else
  61 #include "config.h"
  62 #include "system.h"
  63 #endif
  64
  65 #include "adaint.h"
  66
  67 static FILE *gmemfile;
  68
  69 /* tb_len is the number of call level supported by this module */
  70 #define TB_LEN 200
  71
  72 static char *tracebk [TB_LEN];
  73 static int cur_tb_len, cur_tb_pos;
  74
  75 extern void convert_addresses           PARAMS ((char *[], int, void *,
  76                                                  int *));
  77 static void gmem_read_backtrace         PARAMS ((void));
  78 static char *spc2nul                    PARAMS ((char *));
  79
  80 extern int __gnat_gmem_initialize       PARAMS ((char *));
  81 extern void __gnat_gmem_a2l_initialize  PARAMS ((char *));
  82 extern void __gnat_gmem_read_next       PARAMS ((char *));
  83 extern void __gnat_gmem_read_bt_frame   PARAMS ((char *));
  84 \f
  85 /* Reads backtrace information from gmemfile placing them in tracebk
  86    array. cur_tb_len is the size of this array.   */
  87
  88 static void
  89 gmem_read_backtrace ()
  90 {
  91   fread (&cur_tb_len, sizeof (int), 1, gmemfile);
  92   fread (tracebk, sizeof (char *), cur_tb_len, gmemfile);
  93   cur_tb_pos = 0;
  94 }
  95
  96 /* Initialize gmem feature from the dumpname file. Return 1 if the
  97    dumpname has been generated by GMEM (instrumented malloc/free) and 0 if not
  98    (i.e. probably a GDB generated file). */
  99
 100 int
 101 __gnat_gmem_initialize (dumpname)
 102      char *dumpname;
 103 {
 104   char header[10];
 105
 106   gmemfile = fopen (dumpname, "rb");
 107   fread (header, 10, 1, gmemfile);
 108
 109   /* Check for GMEM magic-tag.  */
 110   if (memcmp (header, "GMEM DUMP\n", 10))
 111     {
 112       fclose (gmemfile);
 113       return 0;
 114     }
 115
 116   return 1;
 117 }
 118
 119 /* Initialize addr2line library */
 120
 121 void
 122 __gnat_gmem_a2l_initialize (exename)
 123      char *exename;
 124 {
 125   extern char **gnat_argv;
 126   char s [100];
 127   int l;
 128
 129   gnat_argv [0] = exename;
 130   convert_addresses (tracebk, 1, s, &l);
 131 }
 132
 133 /* Read next allocation of deallocation information from the GMEM file and
 134    write an alloc/free information in buf to be processed by GDB (see gnatmem
 135    implementation). */
 136
 137 void
 138 __gnat_gmem_read_next (buf)
 139      char *buf;
 140 {
 141   void *addr;
 142   int size;
 143   int j;
 144
 145   j = fgetc (gmemfile);
 146   if (j == EOF)
 147     {
 148       fclose (gmemfile);
 149       sprintf (buf, "Program exited.");
 150     }
 151   else
 152     {
 153       switch (j)
 154         {
 155           case 'A' :
 156             fread (&addr, sizeof (char *), 1, gmemfile);
 157             fread (&size, sizeof (int), 1, gmemfile);
 158             sprintf (buf, "ALLOC^%d^0x%lx^", size, (long) addr);
 159             break;
 160           case 'D' :
 161             fread (&addr, sizeof (char *), 1, gmemfile);
 162             sprintf (buf, "DEALL^0x%lx^", (long) addr);
 163             break;
 164           default:
 165             puts ("GMEM dump file corrupt");
 166             __gnat_os_exit (1);
 167         }
 168
 169       gmem_read_backtrace ();
 170     }
 171 }
 172
 173 /* Scans the line until the space or new-line character is encountered;
 174    this character is replaced by nul and its position is returned.  */
 175
 176 static char *
 177 spc2nul (s)
 178      char *s;
 179 {
 180   while (*++s)
 181     if (*s == ' ' || *s == '\n')
 182       {
 183         *s = 0;
 184         return s;
 185       }
 186
 187   abort ();
 188 }
 189
 190 /* Convert backtrace address in tracebk at position cur_tb_pos to a symbolic
 191    traceback information returned in buf and to be processed by GDB (see
 192    gnatmem implementation).  */
 193
 194 void
 195 __gnat_gmem_read_bt_frame (buf)
 196      char *buf;
 197 {
 198   int l = 0;
 199   char s[1000];
 200   char *name, *file;
 201
 202   if (cur_tb_pos >= cur_tb_len)
 203     {
 204       buf [0] = ' ';
 205       buf [1] = '\0';
 206       return;
 207     }
 208
 209   convert_addresses (tracebk + cur_tb_pos, 1, s, &l);
 210   s[l] = '\0';
 211   name = spc2nul (s) + 4;
 212   file = spc2nul (name) + 4;
 213   spc2nul (file);
 214   ++cur_tb_pos;
 215
 216   sprintf (buf, "#  %s () at %s", name, file);
 217 }