/* Remap file names for debug info for GNU assembler.

   Copyright (C) 2007-2025 Free Software Foundation, Inc.

   This file is part of GAS, the GNU Assembler.

   GAS is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   GAS is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with GAS; see the file COPYING.  If not, write to the Free

   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA

   02110-1301, USA.  */

#include "as.h"

#include "filenames.h"

/* Structure recording the mapping from source file and directory

   names at compile time to those to be embedded in debug

   information.  */

typedef struct debug_prefix_map

{

  const char *old_prefix;

  const char *new_prefix;

  size_t old_len;

  size_t new_len;

  struct debug_prefix_map *next;

} debug_prefix_map;

/* Linked list of such structures.  */

debug_prefix_map *debug_prefix_maps;

/* Record a debug file prefix mapping.  ARG is the argument to

   -fdebug-prefix-map and must be of the form OLD=NEW.  */

void

add_debug_prefix_map (const char *arg)

{

  debug_prefix_map *map;

  const char *p;

  char *o;

  p = strchr (arg, '=');

  if (!p)

    {

      as_fatal (_("invalid argument '%s' to -fdebug-prefix-map"), arg);

      return;

    }

  map = XNEW (debug_prefix_map);

  o = xstrdup (arg);

  map->old_prefix = o;

  map->old_len = p - arg;

  o[map->old_len] = 0;

  p++;

  map->new_prefix = xstrdup (p);

  map->new_len = strlen (p);

  map->next = debug_prefix_maps;

  debug_prefix_maps = map;

}

/* Perform user-specified mapping of debug filename prefixes.  Returns

   a newly allocated buffer containing the name corresponding to FILENAME.

   It is the caller's responsibility to free the buffer.  */

char *

remap_debug_filename (const char *filename)

{

  debug_prefix_map *map;

  for (map = debug_prefix_maps; map; map = map->next)

    if (filename_ncmp (filename, map->old_prefix, map->old_len) == 0)

      {

  const char *name = filename + map->old_len;

  return concat (map->new_prefix, name, NULL);

      }

  return xstrdup (filename);

}