gas/remap.c

   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
  23 /* Structure recording the mapping from source file and directory
  24    names at compile time to those to be embedded in debug
  25    information.  */
  26 typedef struct debug_prefix_map
  27 {
  28   const char *old_prefix;
  29   const char *new_prefix;
  30   size_t old_len;
  31   size_t new_len;
  32   struct debug_prefix_map *next;
  33 } debug_prefix_map;
  34
  35 /* Linked list of such structures.  */
  36 debug_prefix_map *debug_prefix_maps;
  37
  38
  39 /* Record a debug file prefix mapping.  ARG is the argument to
  40    -fdebug-prefix-map and must be of the form OLD=NEW.  */
  41
  42 void
  43 add_debug_prefix_map (const char *arg)
  44 {
  45   debug_prefix_map *map;
  46   const char *p;
  47   char *o;
  48
  49   p = strchr (arg, '=');
  50   if (!p)
  51     {
  52       as_fatal (_("invalid argument '%s' to -fdebug-prefix-map"), arg);
  53       return;
  54     }
  55   map = xmalloc (sizeof (debug_prefix_map));
  56   o = xstrdup (arg);
  57   map->old_prefix = o;
  58   map->old_len = p - arg;
  59   o[map->old_len] = 0;
  60   p++;
  61   map->new_prefix = xstrdup (p);
  62   map->new_len = strlen (p);
  63   map->next = debug_prefix_maps;
  64   debug_prefix_maps = map;
  65 }
  66
  67 /* Perform user-specified mapping of debug filename prefixes.  Return
  68    the new name corresponding to FILENAME.  */
  69
  70 const char *
  71 remap_debug_filename (const char *filename)
  72 {
  73   debug_prefix_map *map;
  74   char *s;
  75   const char *name;
  76   size_t name_len;
  77
  78   for (map = debug_prefix_maps; map; map = map->next)
  79     if (strncmp (filename, map->old_prefix, map->old_len) == 0)
  80       break;
  81   if (!map)
  82     return filename;
  83   name = filename + map->old_len;
  84   name_len = strlen (name) + 1;
  85   s = (char *) alloca (name_len + map->new_len);
  86   memcpy (s, map->new_prefix, map->new_len);
  87   memcpy (s + map->new_len, name, name_len);
  88   return xstrdup (s);
  89 }