gas/remap.c

   1 /* Remap file names for debug info for GNU assembler.
   2    Copyright (C) 2007-2020 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 = XNEW (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
  77   for (map = debug_prefix_maps; map; map = map->next)
  78     if (filename_ncmp (filename, map->old_prefix, map->old_len) == 0)
  79       {
  80         const char *name = filename + map->old_len;
  81         return concat (map->new_prefix, name, NULL);
  82       }
  83
  84   return xstrdup (filename);
  85 }