debug/dwarf: formStrp uses a 64-bit value for 64-bit DWARF
[official-gcc.git] / gcc / prefix.c
blob596649513818aca3c6ef2ba3c515e61807c81452
1 /* Utility to update paths from internal to external forms.
2 Copyright (C) 1997-2018 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU Library General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or (at
9 your option) any later version.
11 GCC 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 GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* This file contains routines to update a path, both to canonicalize
21 the directory format and to handle any prefix translation.
23 This file must be compiled with -DPREFIX= to specify the "prefix"
24 value used by configure. If a filename does not begin with this
25 prefix, it will not be affected other than by directory canonicalization.
27 Each caller of 'update_path' may specify both a filename and
28 a translation prefix and consist of the name of the package that contains
29 the file ("@GCC", "@BINUTIL", "@GNU", etc).
31 If the prefix is not specified, the filename will only undergo
32 directory canonicalization.
34 If it is specified, the string given by PREFIX will be replaced
35 by the specified prefix (with a '@' in front unless the prefix begins
36 with a '$') and further translation will be done as follows
37 until none of the two conditions below are met:
39 1) If the filename begins with '@', the string between the '@' and
40 the end of the name or the first '/' or directory separator will
41 be considered a "key" and looked up as follows:
43 -- If this is a Win32 OS, then the Registry will be examined for
44 an entry of "key" in
46 HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\<KEY>
48 if found, that value will be used. <KEY> defaults to GCC version
49 string, but can be overridden at configuration time.
51 -- If not found (or not a Win32 OS), the environment variable
52 key_ROOT (the value of "key" concatenated with the constant "_ROOT")
53 is tried. If that fails, then PREFIX (see above) is used.
55 2) If the filename begins with a '$', the rest of the string up
56 to the end or the first '/' or directory separator will be used
57 as an environment variable, whose value will be returned.
59 Once all this is done, any '/' will be converted to DIR_SEPARATOR,
60 if they are different.
62 NOTE: using resolve_keyed_path under Win32 requires linking with
63 advapi32.dll. */
66 #include "config.h"
67 #include "system.h"
68 #include "coretypes.h"
69 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
70 #include <windows.h>
71 #endif
72 #include "prefix.h"
73 #include "common/common-target.h"
75 static const char *std_prefix = PREFIX;
77 static const char *get_key_value (char *);
78 static char *translate_name (char *);
79 static char *save_string (const char *, int);
80 static void tr (char *, int, int);
82 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
83 static char *lookup_key (char *);
84 static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
85 #endif
87 /* Given KEY, as above, return its value. */
89 static const char *
90 get_key_value (char *key)
92 const char *prefix = 0;
93 char *temp = 0;
95 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
96 prefix = lookup_key (key);
97 #endif
99 if (prefix == 0)
100 prefix = getenv (temp = concat (key, "_ROOT", NULL));
102 if (prefix == 0)
103 prefix = std_prefix;
105 free (temp);
107 return prefix;
110 /* Return a copy of a string that has been placed in the heap. */
112 static char *
113 save_string (const char *s, int len)
115 char *result = XNEWVEC (char, len + 1);
117 memcpy (result, s, len);
118 result[len] = 0;
119 return result;
122 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
124 #ifndef WIN32_REGISTRY_KEY
125 # define WIN32_REGISTRY_KEY BASEVER
126 #endif
128 /* Look up "key" in the registry, as above. */
130 static char *
131 lookup_key (char *key)
133 char *dst;
134 DWORD size;
135 DWORD type;
136 LONG res;
138 if (reg_key == (HKEY) INVALID_HANDLE_VALUE)
140 res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0,
141 KEY_READ, &reg_key);
143 if (res == ERROR_SUCCESS)
144 res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0,
145 KEY_READ, &reg_key);
147 if (res == ERROR_SUCCESS)
148 res = RegOpenKeyExA (reg_key, WIN32_REGISTRY_KEY, 0,
149 KEY_READ, &reg_key);
151 if (res != ERROR_SUCCESS)
153 reg_key = (HKEY) INVALID_HANDLE_VALUE;
154 return 0;
158 size = 32;
159 dst = XNEWVEC (char, size);
161 res = RegQueryValueExA (reg_key, key, 0, &type, (LPBYTE) dst, &size);
162 if (res == ERROR_MORE_DATA && type == REG_SZ)
164 dst = XRESIZEVEC (char, dst, size);
165 res = RegQueryValueExA (reg_key, key, 0, &type, (LPBYTE) dst, &size);
168 if (type != REG_SZ || res != ERROR_SUCCESS)
170 free (dst);
171 dst = 0;
174 return dst;
176 #endif
178 /* If NAME, a malloc-ed string, starts with a '@' or '$', apply the
179 translation rules above and return a newly malloc-ed name.
180 Otherwise, return the given name. */
182 static char *
183 translate_name (char *name)
185 char code;
186 char *key, *old_name;
187 const char *prefix;
188 int keylen;
190 for (;;)
192 code = name[0];
193 if (code != '@' && code != '$')
194 break;
196 for (keylen = 0;
197 (name[keylen + 1] != 0 && !IS_DIR_SEPARATOR (name[keylen + 1]));
198 keylen++)
201 key = (char *) alloca (keylen + 1);
202 memcpy (key, &name[1], keylen);
203 key[keylen] = 0;
205 if (code == '@')
207 prefix = get_key_value (key);
208 if (prefix == 0)
209 prefix = std_prefix;
211 else
212 prefix = getenv (key);
214 if (prefix == 0)
215 prefix = PREFIX;
217 /* We used to strip trailing DIR_SEPARATORs here, but that can
218 sometimes yield a result with no separator when one was coded
219 and intended by the user, causing two path components to run
220 together. */
222 old_name = name;
223 name = concat (prefix, &name[keylen + 1], NULL);
224 free (old_name);
227 return name;
230 /* In a NUL-terminated STRING, replace character C1 with C2 in-place. */
231 static void
232 tr (char *string, int c1, int c2)
236 if (*string == c1)
237 *string = c2;
239 while (*string++);
242 /* Update PATH using KEY if PATH starts with PREFIX as a directory.
243 The returned string is always malloc-ed, and the caller is
244 responsible for freeing it. */
246 char *
247 update_path (const char *path, const char *key)
249 char *result, *p;
250 const int len = strlen (std_prefix);
252 if (! filename_ncmp (path, std_prefix, len)
253 && (IS_DIR_SEPARATOR (path[len])
254 || path[len] == '\0')
255 && key != 0)
257 bool free_key = false;
259 if (key[0] != '$')
261 key = concat ("@", key, NULL);
262 free_key = true;
265 result = concat (key, &path[len], NULL);
266 if (free_key)
267 free (CONST_CAST (char *, key));
268 result = translate_name (result);
270 else
271 result = xstrdup (path);
273 p = result;
274 while (1)
276 char *src, *dest;
278 p = strchr (p, '.');
279 if (p == NULL)
280 break;
281 /* Look for `/../' */
282 if (p[1] == '.'
283 && IS_DIR_SEPARATOR (p[2])
284 && (p != result && IS_DIR_SEPARATOR (p[-1])))
286 *p = 0;
287 if (!targetm_common.always_strip_dotdot
288 && access (result, X_OK) == 0)
290 *p = '.';
291 break;
293 else
295 /* We can't access the dir, so we won't be able to
296 access dir/.. either. Strip out `dir/../'. If `dir'
297 turns out to be `.', strip one more path component. */
298 dest = p;
301 --dest;
302 while (dest != result && IS_DIR_SEPARATOR (*dest))
303 --dest;
304 while (dest != result && !IS_DIR_SEPARATOR (dest[-1]))
305 --dest;
307 while (dest != result && *dest == '.');
308 /* If we have something like `./..' or `/..', don't
309 strip anything more. */
310 if (*dest == '.' || IS_DIR_SEPARATOR (*dest))
312 *p = '.';
313 break;
315 src = p + 3;
316 while (IS_DIR_SEPARATOR (*src))
317 ++src;
318 p = dest;
319 while ((*dest++ = *src++) != 0)
323 else
324 ++p;
327 #ifdef UPDATE_PATH_HOST_CANONICALIZE
328 /* Perform host dependent canonicalization when needed. */
329 UPDATE_PATH_HOST_CANONICALIZE (result);
330 #endif
332 #ifdef DIR_SEPARATOR_2
333 /* Convert DIR_SEPARATOR_2 to DIR_SEPARATOR. */
334 if (DIR_SEPARATOR_2 != DIR_SEPARATOR)
335 tr (result, DIR_SEPARATOR_2, DIR_SEPARATOR);
336 #endif
338 #if defined (DIR_SEPARATOR) && !defined (DIR_SEPARATOR_2)
339 if (DIR_SEPARATOR != '/')
340 tr (result, '/', DIR_SEPARATOR);
341 #endif
343 return result;
346 /* Reset the standard prefix. */
347 void
348 set_std_prefix (const char *prefix, int len)
350 std_prefix = save_string (prefix, len);