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/* Implementation of file prefix remapping support (-f*-prefix-map options).
Copyright (C) 2017-2020 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);
}
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