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  1. /* Remap file names for debug info for GNU assembler.
  2.    Copyright 2007 Free Software Foundation, Inc.
  3.  
  4.    This file is part of GAS, the GNU Assembler.
  5.  
  6.    GAS is free software; you can redistribute it and/or modify
  7.    it under the terms of the GNU General Public License as published by
  8.    the Free Software Foundation; either version 3, or (at your option)
  9.    any later version.
  10.  
  11.    GAS is distributed in the hope that it will be useful,
  12.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14.    GNU General Public License for more details.
  15.  
  16.    You should have received a copy of the GNU General Public License
  17.    along with GAS; see the file COPYING.  If not, write to the Free
  18.    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  19.    02110-1301, USA.  */
  20.  
  21. #include "as.h"
  22. #include "filenames.h"
  23.  
  24. /* Structure recording the mapping from source file and directory
  25.    names at compile time to those to be embedded in debug
  26.    information.  */
  27. typedef struct debug_prefix_map
  28. {
  29.   const char *old_prefix;
  30.   const char *new_prefix;
  31.   size_t old_len;
  32.   size_t new_len;
  33.   struct debug_prefix_map *next;
  34. } debug_prefix_map;
  35.  
  36. /* Linked list of such structures.  */
  37. debug_prefix_map *debug_prefix_maps;
  38.  
  39.  
  40. /* Record a debug file prefix mapping.  ARG is the argument to
  41.    -fdebug-prefix-map and must be of the form OLD=NEW.  */
  42.  
  43. void
  44. add_debug_prefix_map (const char *arg)
  45. {
  46.   debug_prefix_map *map;
  47.   const char *p;
  48.   char *o;
  49.  
  50.   p = strchr (arg, '=');
  51.   if (!p)
  52.     {
  53.       as_fatal (_("invalid argument '%s' to -fdebug-prefix-map"), arg);
  54.       return;
  55.     }
  56.   map = (struct debug_prefix_map *) xmalloc (sizeof (debug_prefix_map));
  57.   o = xstrdup (arg);
  58.   map->old_prefix = o;
  59.   map->old_len = p - arg;
  60.   o[map->old_len] = 0;
  61.   p++;
  62.   map->new_prefix = xstrdup (p);
  63.   map->new_len = strlen (p);
  64.   map->next = debug_prefix_maps;
  65.   debug_prefix_maps = map;
  66. }
  67.  
  68. /* Perform user-specified mapping of debug filename prefixes.  Returns
  69.    a newly allocated buffer containing the name corresponding to FILENAME.
  70.    It is the caller's responsibility to free the buffer.  */
  71.  
  72. const char *
  73. remap_debug_filename (const char *filename)
  74. {
  75.   debug_prefix_map *map;
  76.   char *s;
  77.   const char *name;
  78.   size_t name_len;
  79.  
  80.   for (map = debug_prefix_maps; map; map = map->next)
  81.     if (filename_ncmp (filename, map->old_prefix, map->old_len) == 0)
  82.       break;
  83.   if (!map)
  84.     return xstrdup (filename);
  85.   name = filename + map->old_len;
  86.   name_len = strlen (name) + 1;
  87.   s = (char *) alloca (name_len + map->new_len);
  88.   memcpy (s, map->new_prefix, map->new_len);
  89.   memcpy (s + map->new_len, name, name_len);
  90.   return xstrdup (s);
  91. }
  92.