+/* ??? This is probably the wrong place for these. */
+/* 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;
+
+ p = strchr (arg, '=');
+ if (!p)
+ {
+ error ("invalid argument %qs to -fdebug-prefix-map", arg);
+ return;
+ }
+ map = XNEW (debug_prefix_map);
+ map->old_prefix = ggc_alloc_string (arg, p - arg);
+ map->old_len = p - arg;
+ p++;
+ map->new_prefix = ggc_strdup (p);
+ map->new_len = strlen (p);
+ map->next = debug_prefix_maps;
+ debug_prefix_maps = map;
+}
+
+/* Perform user-specified mapping of debug filename prefixes. Return
+ the new name corresponding to FILENAME. */
+
+const char *
+remap_debug_filename (const char *filename)
+{
+ debug_prefix_map *map;
+ char *s;
+ const char *name;
+ size_t name_len;
+
+ for (map = debug_prefix_maps; map; map = map->next)
+ if (strncmp (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 *) alloca (name_len + map->new_len);
+ memcpy (s, map->new_prefix, map->new_len);
+ memcpy (s + map->new_len, name, name_len);
+ return ggc_strdup (s);
+}
+\f
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