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bb09dca5 | 1 | /* Code to maintain a C++ template repository. |
b6c1bd72 | 2 | Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005, |
cfaf579d | 3 | 2006, 2007, 2008 Free Software Foundation, Inc. |
bb09dca5 | 4 | Contributed by Jason Merrill (jason@cygnus.com) |
5 | ||
6f0d25a6 | 6 | This file is part of GCC. |
bb09dca5 | 7 | |
6f0d25a6 | 8 | GCC is free software; you can redistribute it and/or modify |
bb09dca5 | 9 | it under the terms of the GNU General Public License as published by |
aa139c3f | 10 | the Free Software Foundation; either version 3, or (at your option) |
bb09dca5 | 11 | any later version. |
12 | ||
6f0d25a6 | 13 | GCC is distributed in the hope that it will be useful, |
bb09dca5 | 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
aa139c3f | 19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
bb09dca5 | 21 | |
22 | /* My strategy here is as follows: | |
23 | ||
24 | Everything should be emitted in a translation unit where it is used. | |
25 | The results of the automatic process should be easily reproducible with | |
11682839 | 26 | explicit code. */ |
bb09dca5 | 27 | |
11682839 | 28 | #include "config.h" |
b3ef7553 | 29 | #include "system.h" |
805e22b2 | 30 | #include "coretypes.h" |
31 | #include "tm.h" | |
bb09dca5 | 32 | #include "tree.h" |
33 | #include "cp-tree.h" | |
34 | #include "input.h" | |
3e1ffd94 | 35 | #include "obstack.h" |
2a4e40b0 | 36 | #include "toplev.h" |
a587b03b | 37 | #include "diagnostic.h" |
2c3e097e | 38 | #include "flags.h" |
bb09dca5 | 39 | |
26ac6687 | 40 | static char *extract_string (char **); |
41 | static const char *get_base_filename (const char *); | |
8b35a404 | 42 | static FILE *open_repo_file (const char *); |
26ac6687 | 43 | static char *afgets (FILE *); |
8b35a404 | 44 | static FILE *reopen_repo_file_for_write (void); |
bb09dca5 | 45 | |
1f3233d1 | 46 | static GTY(()) tree pending_repo; |
3f7d79e4 | 47 | static char *repo_name; |
bb09dca5 | 48 | |
17dd1766 | 49 | static const char *old_args, *old_dir, *old_main; |
6686e84d | 50 | |
d7c47c0e | 51 | static struct obstack temporary_obstack; |
caa6fdce | 52 | static bool temporary_obstack_initialized_p; |
dc76caae | 53 | |
6686e84d | 54 | /* Parse a reasonable subset of shell quoting syntax. */ |
55 | ||
56 | static char * | |
26ac6687 | 57 | extract_string (char **pp) |
6686e84d | 58 | { |
59 | char *p = *pp; | |
60 | int backquote = 0; | |
61 | int inside = 0; | |
62 | ||
63 | for (;;) | |
64 | { | |
65 | char c = *p; | |
66 | if (c == '\0') | |
67 | break; | |
68 | ++p; | |
69 | if (backquote) | |
4840a255 | 70 | { |
71 | obstack_1grow (&temporary_obstack, c); | |
72 | backquote = 0; | |
73 | } | |
6686e84d | 74 | else if (! inside && c == ' ') |
75 | break; | |
76 | else if (! inside && c == '\\') | |
77 | backquote = 1; | |
78 | else if (c == '\'') | |
79 | inside = !inside; | |
80 | else | |
81 | obstack_1grow (&temporary_obstack, c); | |
82 | } | |
83 | ||
84 | obstack_1grow (&temporary_obstack, '\0'); | |
85 | *pp = p; | |
4e41d774 | 86 | return (char *) obstack_finish (&temporary_obstack); |
6686e84d | 87 | } |
88 | ||
9140e457 | 89 | static const char * |
26ac6687 | 90 | get_base_filename (const char *filename) |
11682839 | 91 | { |
92 | char *p = getenv ("COLLECT_GCC_OPTIONS"); | |
6686e84d | 93 | char *output = NULL; |
11682839 | 94 | int compiling = 0; |
95 | ||
6686e84d | 96 | while (p && *p) |
97 | { | |
98 | char *q = extract_string (&p); | |
11682839 | 99 | |
6686e84d | 100 | if (strcmp (q, "-o") == 0) |
101 | output = extract_string (&p); | |
102 | else if (strcmp (q, "-c") == 0) | |
103 | compiling = 1; | |
4840a255 | 104 | } |
11682839 | 105 | |
106 | if (compiling && output) | |
107 | return output; | |
108 | ||
3e1ffd94 | 109 | if (p && ! compiling) |
110 | { | |
c3ceba8e | 111 | warning (0, "-frepo must be used with -c"); |
3e1ffd94 | 112 | flag_use_repository = 0; |
113 | return NULL; | |
114 | } | |
115 | ||
40275504 | 116 | return lbasename (filename); |
9031d10b | 117 | } |
11682839 | 118 | |
8b35a404 | 119 | static FILE * |
26ac6687 | 120 | open_repo_file (const char *filename) |
bb09dca5 | 121 | { |
cd16867a | 122 | const char *p; |
e1721763 | 123 | const char *s = get_base_filename (filename); |
3e1ffd94 | 124 | |
3f7d79e4 | 125 | if (s == NULL) |
8b35a404 | 126 | return NULL; |
3e1ffd94 | 127 | |
40275504 | 128 | p = lbasename (s); |
78dbff7c | 129 | p = strrchr (p, '.'); |
3f7d79e4 | 130 | if (! p) |
131 | p = s + strlen (s); | |
bb09dca5 | 132 | |
56e60747 | 133 | repo_name = XNEWVEC (char, p - s + 5); |
92192583 | 134 | memcpy (repo_name, s, p - s); |
135 | memcpy (repo_name + (p - s), ".rpo", 5); | |
bb09dca5 | 136 | |
8b35a404 | 137 | return fopen (repo_name, "r"); |
bb09dca5 | 138 | } |
139 | ||
3f7d79e4 | 140 | static char * |
26ac6687 | 141 | afgets (FILE *stream) |
3f7d79e4 | 142 | { |
143 | int c; | |
144 | while ((c = getc (stream)) != EOF && c != '\n') | |
145 | obstack_1grow (&temporary_obstack, c); | |
146 | if (obstack_object_size (&temporary_obstack) == 0) | |
147 | return NULL; | |
148 | obstack_1grow (&temporary_obstack, '\0'); | |
4e41d774 | 149 | return (char *) obstack_finish (&temporary_obstack); |
3f7d79e4 | 150 | } |
151 | ||
bb09dca5 | 152 | void |
caa6fdce | 153 | init_repo (void) |
bb09dca5 | 154 | { |
3f7d79e4 | 155 | char *buf; |
8b35a404 | 156 | FILE *repo_file; |
bb09dca5 | 157 | |
158 | if (! flag_use_repository) | |
159 | return; | |
160 | ||
caa6fdce | 161 | /* When a PCH file is loaded, the entire identifier table is |
162 | replaced, with the result that IDENTIFIER_REPO_CHOSEN is cleared. | |
163 | So, we have to reread the repository file. */ | |
164 | lang_post_pch_load = init_repo; | |
165 | ||
166 | if (!temporary_obstack_initialized_p) | |
167 | gcc_obstack_init (&temporary_obstack); | |
1e4853c2 | 168 | |
8b35a404 | 169 | repo_file = open_repo_file (main_input_filename); |
bb09dca5 | 170 | |
171 | if (repo_file == 0) | |
172 | return; | |
173 | ||
034b484a | 174 | while ((buf = afgets (repo_file))) |
bb09dca5 | 175 | { |
bb09dca5 | 176 | switch (buf[0]) |
177 | { | |
178 | case 'A': | |
92192583 | 179 | old_args = ggc_strdup (buf + 2); |
6686e84d | 180 | break; |
3f7d79e4 | 181 | case 'D': |
92192583 | 182 | old_dir = ggc_strdup (buf + 2); |
6686e84d | 183 | break; |
bb09dca5 | 184 | case 'M': |
92192583 | 185 | old_main = ggc_strdup (buf + 2); |
bb09dca5 | 186 | break; |
bb09dca5 | 187 | case 'O': |
caa6fdce | 188 | /* A symbol that we were able to define the last time this |
189 | file was compiled. */ | |
190 | break; | |
191 | case 'C': | |
192 | /* A symbol that the prelinker has requested that we | |
193 | define. */ | |
bb09dca5 | 194 | { |
3f7d79e4 | 195 | tree id = get_identifier (buf + 2); |
caa6fdce | 196 | IDENTIFIER_REPO_CHOSEN (id) = 1; |
bb09dca5 | 197 | } |
198 | break; | |
199 | default: | |
905d4035 | 200 | error ("mysterious repository information in %s", repo_name); |
bb09dca5 | 201 | } |
3f7d79e4 | 202 | obstack_free (&temporary_obstack, buf); |
bb09dca5 | 203 | } |
caa6fdce | 204 | fclose (repo_file); |
b6c1bd72 | 205 | |
206 | if (old_args && !get_random_seed (true) | |
207 | && (buf = strstr (old_args, "'-frandom-seed="))) | |
208 | set_random_seed (extract_string (&buf) + strlen ("-frandom-seed=")); | |
bb09dca5 | 209 | } |
210 | ||
8b35a404 | 211 | static FILE * |
26ac6687 | 212 | reopen_repo_file_for_write (void) |
bb09dca5 | 213 | { |
8b35a404 | 214 | FILE *repo_file = fopen (repo_name, "w"); |
bb09dca5 | 215 | |
216 | if (repo_file == 0) | |
217 | { | |
44ed1032 | 218 | error ("can't create repository information file %qs", repo_name); |
bb09dca5 | 219 | flag_use_repository = 0; |
220 | } | |
8b35a404 | 221 | |
222 | return repo_file; | |
bb09dca5 | 223 | } |
224 | ||
225 | /* Emit any pending repos. */ | |
226 | ||
227 | void | |
26ac6687 | 228 | finish_repo (void) |
bb09dca5 | 229 | { |
230 | tree t; | |
6686e84d | 231 | char *dir, *args; |
8b35a404 | 232 | FILE *repo_file; |
bb09dca5 | 233 | |
26ac6687 | 234 | if (!flag_use_repository) |
bb09dca5 | 235 | return; |
236 | ||
caa6fdce | 237 | if (errorcount || sorrycount) |
8b35a404 | 238 | return; |
bb09dca5 | 239 | |
8b35a404 | 240 | repo_file = reopen_repo_file_for_write (); |
bb09dca5 | 241 | if (repo_file == 0) |
242 | goto out; | |
243 | ||
11682839 | 244 | fprintf (repo_file, "M %s\n", main_input_filename); |
caa6fdce | 245 | dir = getpwd (); |
6686e84d | 246 | fprintf (repo_file, "D %s\n", dir); |
caa6fdce | 247 | args = getenv ("COLLECT_GCC_OPTIONS"); |
6686e84d | 248 | if (args) |
2c3e097e | 249 | { |
250 | fprintf (repo_file, "A %s", args); | |
251 | /* If -frandom-seed is not among the ARGS, then add the value | |
252 | that we chose. That will ensure that the names of types from | |
253 | anonymous namespaces will get the same mangling when this | |
254 | file is recompiled. */ | |
255 | if (!strstr (args, "'-frandom-seed=")) | |
b6c1bd72 | 256 | fprintf (repo_file, " '-frandom-seed=%s'", get_random_seed (false)); |
2c3e097e | 257 | fprintf (repo_file, "\n"); |
258 | } | |
11682839 | 259 | |
bb09dca5 | 260 | for (t = pending_repo; t; t = TREE_CHAIN (t)) |
261 | { | |
262 | tree val = TREE_VALUE (t); | |
caa6fdce | 263 | tree name = DECL_ASSEMBLER_NAME (val); |
264 | char type = IDENTIFIER_REPO_CHOSEN (name) ? 'C' : 'O'; | |
265 | fprintf (repo_file, "%c %s\n", type, IDENTIFIER_POINTER (name)); | |
bb09dca5 | 266 | } |
267 | ||
268 | out: | |
269 | if (repo_file) | |
270 | fclose (repo_file); | |
271 | } | |
1f3233d1 | 272 | |
caa6fdce | 273 | /* DECL is a FUNCTION_DECL or VAR_DECL with vague linkage whose |
274 | definition is available in this translation unit. Returns 0 if | |
275 | this definition should not be emitted in this translation unit | |
276 | because it will be emitted elsewhere. Returns 1 if the repository | |
277 | file indicates that that DECL should be emitted in this translation | |
278 | unit, or 2 if the repository file is not in use. */ | |
279 | ||
280 | int | |
281 | repo_emit_p (tree decl) | |
282 | { | |
7133f4fc | 283 | int ret = 0; |
b4df430b | 284 | gcc_assert (TREE_PUBLIC (decl)); |
285 | gcc_assert (TREE_CODE (decl) == FUNCTION_DECL | |
286 | || TREE_CODE (decl) == VAR_DECL); | |
287 | gcc_assert (!DECL_REALLY_EXTERN (decl)); | |
caa6fdce | 288 | |
289 | /* When not using the repository, emit everything. */ | |
290 | if (!flag_use_repository) | |
291 | return 2; | |
292 | ||
293 | /* Only template instantiations are managed by the repository. This | |
294 | is an artificial restriction; the code in the prelinker and here | |
295 | will work fine if all entities with vague linkage are managed by | |
296 | the repository. */ | |
297 | if (TREE_CODE (decl) == VAR_DECL) | |
298 | { | |
299 | tree type = NULL_TREE; | |
300 | if (DECL_VTABLE_OR_VTT_P (decl)) | |
301 | type = DECL_CONTEXT (decl); | |
302 | else if (DECL_TINFO_P (decl)) | |
303 | type = TREE_TYPE (DECL_NAME (decl)); | |
304 | if (!DECL_TEMPLATE_INSTANTIATION (decl) | |
c40c1730 | 305 | && (!TYPE_LANG_SPECIFIC (type) |
306 | || !CLASSTYPE_TEMPLATE_INSTANTIATION (type))) | |
caa6fdce | 307 | return 2; |
af3f756d | 308 | /* Const static data members initialized by constant expressions must |
b3cee199 | 309 | be processed where needed so that their definitions are |
7133f4fc | 310 | available. Still record them into *.rpo files, so if they |
311 | weren't actually emitted and collect2 requests them, they can | |
312 | be provided. */ | |
af3f756d | 313 | if (DECL_INTEGRAL_CONSTANT_VAR_P (decl) |
b3cee199 | 314 | && DECL_CLASS_SCOPE_P (decl)) |
7133f4fc | 315 | ret = 2; |
caa6fdce | 316 | } |
317 | else if (!DECL_TEMPLATE_INSTANTIATION (decl)) | |
318 | return 2; | |
319 | ||
af3f756d | 320 | if (DECL_EXPLICIT_INSTANTIATION (decl)) |
321 | return 2; | |
322 | ||
caa6fdce | 323 | /* For constructors and destructors, the repository contains |
324 | information about the clones -- not the original function -- | |
325 | because only the clones are emitted in the object file. */ | |
326 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl) | |
327 | || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl)) | |
328 | { | |
329 | int emit_p = 0; | |
330 | tree clone; | |
331 | /* There is no early exit from this loop because we want to | |
332 | ensure that all of the clones are marked as available in this | |
333 | object file. */ | |
334 | FOR_EACH_CLONE (clone, decl) | |
335 | /* The only possible results from the recursive call to | |
336 | repo_emit_p are 0 or 1. */ | |
337 | if (repo_emit_p (clone)) | |
338 | emit_p = 1; | |
339 | return emit_p; | |
340 | } | |
341 | ||
342 | /* Keep track of all available entities. */ | |
343 | if (!DECL_REPO_AVAILABLE_P (decl)) | |
344 | { | |
345 | DECL_REPO_AVAILABLE_P (decl) = 1; | |
346 | pending_repo = tree_cons (NULL_TREE, decl, pending_repo); | |
347 | } | |
348 | ||
7133f4fc | 349 | return IDENTIFIER_REPO_CHOSEN (DECL_ASSEMBLER_NAME (decl)) ? 1 : ret; |
caa6fdce | 350 | } |
351 | ||
352 | /* Returns true iff the prelinker has explicitly marked CLASS_TYPE for | |
353 | export from this translation unit. */ | |
354 | ||
355 | bool | |
9f627b1a | 356 | repo_export_class_p (const_tree class_type) |
caa6fdce | 357 | { |
358 | if (!flag_use_repository) | |
359 | return false; | |
360 | if (!CLASSTYPE_VTABLES (class_type)) | |
361 | return false; | |
362 | /* If the virtual table has been assigned to this translation unit, | |
363 | export the class. */ | |
9031d10b | 364 | return (IDENTIFIER_REPO_CHOSEN |
caa6fdce | 365 | (DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (class_type)))); |
366 | } | |
367 | ||
1f3233d1 | 368 | #include "gt-cp-repo.h" |