1 /* Remap file names for debug info for GNU assembler. 2 Copyright (C) 2007-2014 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
