1 /* Implementation of file prefix remapping support (-f*-prefix-map options).
2 Copyright (C) 2017-2023 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU General Public License as published by the
6 Free Software Foundation; either version 3, or (at your option) any
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; see the file COPYING3. If not see
16 <http://www.gnu.org/licenses/>. */
20 #include "coretypes.h"
21 #include "diagnostic.h"
22 #include "file-prefix-map.h"
24 /* Structure recording the mapping from source file and directory names at
25 compile time to those to be embedded in the compilation result (debug
26 information, the __FILE__ macro expansion, etc). */
27 struct file_prefix_map
29 const char *old_prefix
;
30 const char *new_prefix
;
33 struct file_prefix_map
*next
;
36 /* Record a file prefix mapping in the specified map. ARG is the argument to
37 -f*-prefix-map and must be of the form OLD=NEW. OPT is the option name
40 add_prefix_map (file_prefix_map
*&maps
, const char *arg
, const char *opt
)
45 /* Note: looking for the last '='. The thinking is we can control the paths
46 inside our projects but not where the users build them. */
47 p
= strrchr (arg
, '=');
50 error ("invalid argument %qs to %qs", arg
, opt
);
53 map
= XNEW (file_prefix_map
);
54 map
->old_prefix
= xstrndup (arg
, p
- arg
);
55 map
->old_len
= p
- arg
;
57 map
->new_prefix
= xstrdup (p
);
58 map
->new_len
= strlen (p
);
63 /* Perform user-specified mapping of filename prefixes. Return the
64 GC-allocated new name corresponding to FILENAME or FILENAME if no
65 remapping was performed. */
68 remap_filename (file_prefix_map
*maps
, const char *filename
)
76 if (!filename
|| lbasename (filename
) == filename
)
79 realname
= lrealpath (filename
);
81 for (map
= maps
; map
; map
= map
->next
)
82 if (filename_ncmp (realname
, map
->old_prefix
, map
->old_len
) == 0)
89 name
= realname
+ map
->old_len
;
90 name_len
= strlen (name
) + 1;
92 s
= (char *) ggc_alloc_atomic (name_len
+ map
->new_len
);
93 memcpy (s
, map
->new_prefix
, map
->new_len
);
94 memcpy (s
+ map
->new_len
, name
, name_len
);
99 /* NOTE: if adding another -f*-prefix-map option then don't forget to
100 ignore it in DW_AT_producer (dwarf2out.cc). */
102 /* Linked lists of file_prefix_map structures. */
103 static file_prefix_map
*macro_prefix_maps
; /* -fmacro-prefix-map */
104 static file_prefix_map
*debug_prefix_maps
; /* -fdebug-prefix-map */
105 static file_prefix_map
*profile_prefix_maps
; /* -fprofile-prefix-map */
107 /* Record a file prefix mapping for -fmacro-prefix-map. */
109 add_macro_prefix_map (const char *arg
)
111 add_prefix_map (macro_prefix_maps
, arg
, "-fmacro-prefix-map");
114 /* Record a file prefix mapping for -fdebug-prefix-map. */
116 add_debug_prefix_map (const char *arg
)
118 add_prefix_map (debug_prefix_maps
, arg
, "-fdebug-prefix-map");
121 /* Record a file prefix mapping for all -f*-prefix-map. */
123 add_file_prefix_map (const char *arg
)
125 add_prefix_map (macro_prefix_maps
, arg
, "-ffile-prefix-map");
126 add_prefix_map (debug_prefix_maps
, arg
, "-ffile-prefix-map");
127 add_prefix_map (profile_prefix_maps
, arg
, "-ffile-prefix-map");
130 /* Record a file prefix mapping for -fprofile-prefix-map. */
132 add_profile_prefix_map (const char *arg
)
134 add_prefix_map (profile_prefix_maps
, arg
, "-fprofile-prefix-map");
137 /* Remap using -fmacro-prefix-map. Return the GC-allocated new name
138 corresponding to FILENAME or FILENAME if no remapping was performed. */
140 remap_macro_filename (const char *filename
)
142 return remap_filename (macro_prefix_maps
, filename
);
145 /* Remap using -fdebug-prefix-map. Return the GC-allocated new name
146 corresponding to FILENAME or FILENAME if no remapping was performed. */
148 remap_debug_filename (const char *filename
)
150 return remap_filename (debug_prefix_maps
, filename
);
153 /* Remap using -fprofile-prefix-map. Return the GC-allocated new name
154 corresponding to FILENAME or FILENAME if no remapping was performed. */
156 remap_profile_filename (const char *filename
)
158 return remap_filename (profile_prefix_maps
, filename
);