| /* Implementation of file prefix remapping support (-f*-prefix-map options). |
| Copyright (C) 2017-2019 Free Software Foundation, Inc. |
| |
| This program 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. |
| |
| This program 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 this program; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "diagnostic.h" |
| #include "file-prefix-map.h" |
| |
| /* Structure recording the mapping from source file and directory names at |
| compile time to those to be embedded in the compilation result (debug |
| information, the __FILE__ macro expansion, etc). */ |
| struct file_prefix_map |
| { |
| const char *old_prefix; |
| const char *new_prefix; |
| size_t old_len; |
| size_t new_len; |
| struct file_prefix_map *next; |
| }; |
| |
| /* Record a file prefix mapping in the specified map. ARG is the argument to |
| -f*-prefix-map and must be of the form OLD=NEW. OPT is the option name |
| for diagnostics. */ |
| static void |
| add_prefix_map (file_prefix_map *&maps, const char *arg, const char *opt) |
| { |
| file_prefix_map *map; |
| const char *p; |
| |
| /* Note: looking for the last '='. The thinking is we can control the paths |
| inside our projects but not where the users build them. */ |
| p = strrchr (arg, '='); |
| if (!p) |
| { |
| error ("invalid argument %qs to %qs", arg, opt); |
| return; |
| } |
| map = XNEW (file_prefix_map); |
| map->old_prefix = xstrndup (arg, p - arg); |
| map->old_len = p - arg; |
| p++; |
| map->new_prefix = xstrdup (p); |
| map->new_len = strlen (p); |
| map->next = maps; |
| maps = map; |
| } |
| |
| /* Perform user-specified mapping of filename prefixes. Return the |
| GC-allocated new name corresponding to FILENAME or FILENAME if no |
| remapping was performed. */ |
| |
| static const char * |
| remap_filename (file_prefix_map *maps, const char *filename) |
| { |
| file_prefix_map *map; |
| char *s; |
| const char *name; |
| size_t name_len; |
| |
| for (map = maps; map; map = map->next) |
| if (filename_ncmp (filename, map->old_prefix, map->old_len) == 0) |
| break; |
| if (!map) |
| return filename; |
| name = filename + map->old_len; |
| name_len = strlen (name) + 1; |
| |
| s = (char *) ggc_alloc_atomic (name_len + map->new_len); |
| memcpy (s, map->new_prefix, map->new_len); |
| memcpy (s + map->new_len, name, name_len); |
| return s; |
| } |
| |
| /* NOTE: if adding another -f*-prefix-map option then don't forget to |
| ignore it in DW_AT_producer (dwarf2out.c). */ |
| |
| /* Linked lists of file_prefix_map structures. */ |
| static file_prefix_map *macro_prefix_maps; /* -fmacro-prefix-map */ |
| static file_prefix_map *debug_prefix_maps; /* -fdebug-prefix-map */ |
| |
| /* Record a file prefix mapping for -fmacro-prefix-map. */ |
| void |
| add_macro_prefix_map (const char *arg) |
| { |
| add_prefix_map (macro_prefix_maps, arg, "-fmacro-prefix-map"); |
| } |
| |
| /* Record a file prefix mapping for -fdebug-prefix-map. */ |
| void |
| add_debug_prefix_map (const char *arg) |
| { |
| add_prefix_map (debug_prefix_maps, arg, "-fdebug-prefix-map"); |
| } |
| |
| /* Record a file prefix mapping for all -f*-prefix-map. */ |
| void |
| add_file_prefix_map (const char *arg) |
| { |
| add_prefix_map (macro_prefix_maps, arg, "-ffile-prefix-map"); |
| add_prefix_map (debug_prefix_maps, arg, "-ffile-prefix-map"); |
| } |
| |
| /* Remap using -fmacro-prefix-map. Return the GC-allocated new name |
| corresponding to FILENAME or FILENAME if no remapping was performed. */ |
| const char * |
| remap_macro_filename (const char *filename) |
| { |
| return remap_filename (macro_prefix_maps, filename); |
| } |
| |
| /* Remap using -fdebug-prefix-map. Return the GC-allocated new name |
| corresponding to FILENAME or FILENAME if no remapping was performed. */ |
| const char * |
| remap_debug_filename (const char *filename) |
| { |
| return remap_filename (debug_prefix_maps, filename); |
| } |