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bb09dca5 | 1 | /* Code to maintain a C++ template repository. |
99ae5467 | 2 | Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005 |
06fb4c5c | 3 | 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 |
10 | the Free Software Foundation; either version 2, or (at your option) | |
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 | |
6f0d25a6 | 19 | along with GCC; see the file COPYING. If not, write to |
beaeca68 | 20 | the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
bb09dca5 | 22 | |
23 | /* My strategy here is as follows: | |
24 | ||
25 | Everything should be emitted in a translation unit where it is used. | |
26 | The results of the automatic process should be easily reproducible with | |
11682839 | 27 | explicit code. */ |
bb09dca5 | 28 | |
11682839 | 29 | #include "config.h" |
b3ef7553 | 30 | #include "system.h" |
805e22b2 | 31 | #include "coretypes.h" |
32 | #include "tm.h" | |
bb09dca5 | 33 | #include "tree.h" |
34 | #include "cp-tree.h" | |
35 | #include "input.h" | |
3e1ffd94 | 36 | #include "obstack.h" |
2a4e40b0 | 37 | #include "toplev.h" |
a587b03b | 38 | #include "diagnostic.h" |
2c3e097e | 39 | #include "flags.h" |
bb09dca5 | 40 | |
26ac6687 | 41 | static char *extract_string (char **); |
42 | static const char *get_base_filename (const char *); | |
43 | static void open_repo_file (const char *); | |
44 | static char *afgets (FILE *); | |
45 | static void reopen_repo_file_for_write (void); | |
bb09dca5 | 46 | |
1f3233d1 | 47 | static GTY(()) tree pending_repo; |
3f7d79e4 | 48 | static char *repo_name; |
bb09dca5 | 49 | static FILE *repo_file; |
50 | ||
17dd1766 | 51 | static const char *old_args, *old_dir, *old_main; |
6686e84d | 52 | |
d7c47c0e | 53 | static struct obstack temporary_obstack; |
caa6fdce | 54 | static bool temporary_obstack_initialized_p; |
dc76caae | 55 | |
6686e84d | 56 | /* Parse a reasonable subset of shell quoting syntax. */ |
57 | ||
58 | static char * | |
26ac6687 | 59 | extract_string (char **pp) |
6686e84d | 60 | { |
61 | char *p = *pp; | |
62 | int backquote = 0; | |
63 | int inside = 0; | |
64 | ||
65 | for (;;) | |
66 | { | |
67 | char c = *p; | |
68 | if (c == '\0') | |
69 | break; | |
70 | ++p; | |
71 | if (backquote) | |
4840a255 | 72 | { |
73 | obstack_1grow (&temporary_obstack, c); | |
74 | backquote = 0; | |
75 | } | |
6686e84d | 76 | else if (! inside && c == ' ') |
77 | break; | |
78 | else if (! inside && c == '\\') | |
79 | backquote = 1; | |
80 | else if (c == '\'') | |
81 | inside = !inside; | |
82 | else | |
83 | obstack_1grow (&temporary_obstack, c); | |
84 | } | |
85 | ||
86 | obstack_1grow (&temporary_obstack, '\0'); | |
87 | *pp = p; | |
88 | return obstack_finish (&temporary_obstack); | |
89 | } | |
90 | ||
9140e457 | 91 | static const char * |
26ac6687 | 92 | get_base_filename (const char *filename) |
11682839 | 93 | { |
94 | char *p = getenv ("COLLECT_GCC_OPTIONS"); | |
6686e84d | 95 | char *output = NULL; |
11682839 | 96 | int compiling = 0; |
97 | ||
6686e84d | 98 | while (p && *p) |
99 | { | |
100 | char *q = extract_string (&p); | |
11682839 | 101 | |
6686e84d | 102 | if (strcmp (q, "-o") == 0) |
103 | output = extract_string (&p); | |
104 | else if (strcmp (q, "-c") == 0) | |
105 | compiling = 1; | |
4840a255 | 106 | } |
11682839 | 107 | |
108 | if (compiling && output) | |
109 | return output; | |
110 | ||
3e1ffd94 | 111 | if (p && ! compiling) |
112 | { | |
c3ceba8e | 113 | warning (0, "-frepo must be used with -c"); |
3e1ffd94 | 114 | flag_use_repository = 0; |
115 | return NULL; | |
116 | } | |
117 | ||
40275504 | 118 | return lbasename (filename); |
9031d10b | 119 | } |
11682839 | 120 | |
bb09dca5 | 121 | static void |
26ac6687 | 122 | open_repo_file (const char *filename) |
bb09dca5 | 123 | { |
cd16867a | 124 | const char *p; |
e1721763 | 125 | const char *s = get_base_filename (filename); |
3e1ffd94 | 126 | |
3f7d79e4 | 127 | if (s == NULL) |
3e1ffd94 | 128 | return; |
129 | ||
40275504 | 130 | p = lbasename (s); |
78dbff7c | 131 | p = strrchr (p, '.'); |
3f7d79e4 | 132 | if (! p) |
133 | p = s + strlen (s); | |
bb09dca5 | 134 | |
56e60747 | 135 | repo_name = XNEWVEC (char, p - s + 5); |
92192583 | 136 | memcpy (repo_name, s, p - s); |
137 | memcpy (repo_name + (p - s), ".rpo", 5); | |
bb09dca5 | 138 | |
139 | repo_file = fopen (repo_name, "r"); | |
140 | } | |
141 | ||
3f7d79e4 | 142 | static char * |
26ac6687 | 143 | afgets (FILE *stream) |
3f7d79e4 | 144 | { |
145 | int c; | |
146 | while ((c = getc (stream)) != EOF && c != '\n') | |
147 | obstack_1grow (&temporary_obstack, c); | |
148 | if (obstack_object_size (&temporary_obstack) == 0) | |
149 | return NULL; | |
150 | obstack_1grow (&temporary_obstack, '\0'); | |
151 | return obstack_finish (&temporary_obstack); | |
152 | } | |
153 | ||
bb09dca5 | 154 | void |
caa6fdce | 155 | init_repo (void) |
bb09dca5 | 156 | { |
3f7d79e4 | 157 | char *buf; |
bb09dca5 | 158 | |
159 | if (! flag_use_repository) | |
160 | return; | |
161 | ||
caa6fdce | 162 | /* When a PCH file is loaded, the entire identifier table is |
163 | replaced, with the result that IDENTIFIER_REPO_CHOSEN is cleared. | |
164 | So, we have to reread the repository file. */ | |
165 | lang_post_pch_load = init_repo; | |
166 | ||
167 | if (!temporary_obstack_initialized_p) | |
168 | gcc_obstack_init (&temporary_obstack); | |
1e4853c2 | 169 | |
caa6fdce | 170 | open_repo_file (main_input_filename); |
bb09dca5 | 171 | |
172 | if (repo_file == 0) | |
173 | return; | |
174 | ||
034b484a | 175 | while ((buf = afgets (repo_file))) |
bb09dca5 | 176 | { |
bb09dca5 | 177 | switch (buf[0]) |
178 | { | |
179 | case 'A': | |
92192583 | 180 | old_args = ggc_strdup (buf + 2); |
6686e84d | 181 | break; |
3f7d79e4 | 182 | case 'D': |
92192583 | 183 | old_dir = ggc_strdup (buf + 2); |
6686e84d | 184 | break; |
bb09dca5 | 185 | case 'M': |
92192583 | 186 | old_main = ggc_strdup (buf + 2); |
bb09dca5 | 187 | break; |
bb09dca5 | 188 | case 'O': |
caa6fdce | 189 | /* A symbol that we were able to define the last time this |
190 | file was compiled. */ | |
191 | break; | |
192 | case 'C': | |
193 | /* A symbol that the prelinker has requested that we | |
194 | define. */ | |
bb09dca5 | 195 | { |
3f7d79e4 | 196 | tree id = get_identifier (buf + 2); |
caa6fdce | 197 | IDENTIFIER_REPO_CHOSEN (id) = 1; |
bb09dca5 | 198 | } |
199 | break; | |
200 | default: | |
905d4035 | 201 | error ("mysterious repository information in %s", repo_name); |
bb09dca5 | 202 | } |
3f7d79e4 | 203 | obstack_free (&temporary_obstack, buf); |
bb09dca5 | 204 | } |
caa6fdce | 205 | fclose (repo_file); |
bb09dca5 | 206 | } |
207 | ||
208 | static void | |
26ac6687 | 209 | reopen_repo_file_for_write (void) |
bb09dca5 | 210 | { |
bb09dca5 | 211 | repo_file = fopen (repo_name, "w"); |
212 | ||
213 | if (repo_file == 0) | |
214 | { | |
44ed1032 | 215 | error ("can't create repository information file %qs", repo_name); |
bb09dca5 | 216 | flag_use_repository = 0; |
217 | } | |
218 | } | |
219 | ||
220 | /* Emit any pending repos. */ | |
221 | ||
222 | void | |
26ac6687 | 223 | finish_repo (void) |
bb09dca5 | 224 | { |
225 | tree t; | |
6686e84d | 226 | char *dir, *args; |
bb09dca5 | 227 | |
26ac6687 | 228 | if (!flag_use_repository) |
bb09dca5 | 229 | return; |
230 | ||
caa6fdce | 231 | if (errorcount || sorrycount) |
bb09dca5 | 232 | goto out; |
233 | ||
234 | reopen_repo_file_for_write (); | |
bb09dca5 | 235 | if (repo_file == 0) |
236 | goto out; | |
237 | ||
11682839 | 238 | fprintf (repo_file, "M %s\n", main_input_filename); |
caa6fdce | 239 | dir = getpwd (); |
6686e84d | 240 | fprintf (repo_file, "D %s\n", dir); |
caa6fdce | 241 | args = getenv ("COLLECT_GCC_OPTIONS"); |
6686e84d | 242 | if (args) |
2c3e097e | 243 | { |
244 | fprintf (repo_file, "A %s", args); | |
245 | /* If -frandom-seed is not among the ARGS, then add the value | |
246 | that we chose. That will ensure that the names of types from | |
247 | anonymous namespaces will get the same mangling when this | |
248 | file is recompiled. */ | |
249 | if (!strstr (args, "'-frandom-seed=")) | |
250 | fprintf (repo_file, " '-frandom-seed=%s'", flag_random_seed); | |
251 | fprintf (repo_file, "\n"); | |
252 | } | |
11682839 | 253 | |
bb09dca5 | 254 | for (t = pending_repo; t; t = TREE_CHAIN (t)) |
255 | { | |
256 | tree val = TREE_VALUE (t); | |
caa6fdce | 257 | tree name = DECL_ASSEMBLER_NAME (val); |
258 | char type = IDENTIFIER_REPO_CHOSEN (name) ? 'C' : 'O'; | |
259 | fprintf (repo_file, "%c %s\n", type, IDENTIFIER_POINTER (name)); | |
bb09dca5 | 260 | } |
261 | ||
262 | out: | |
263 | if (repo_file) | |
264 | fclose (repo_file); | |
265 | } | |
1f3233d1 | 266 | |
caa6fdce | 267 | /* DECL is a FUNCTION_DECL or VAR_DECL with vague linkage whose |
268 | definition is available in this translation unit. Returns 0 if | |
269 | this definition should not be emitted in this translation unit | |
270 | because it will be emitted elsewhere. Returns 1 if the repository | |
271 | file indicates that that DECL should be emitted in this translation | |
272 | unit, or 2 if the repository file is not in use. */ | |
273 | ||
274 | int | |
275 | repo_emit_p (tree decl) | |
276 | { | |
b4df430b | 277 | gcc_assert (TREE_PUBLIC (decl)); |
278 | gcc_assert (TREE_CODE (decl) == FUNCTION_DECL | |
279 | || TREE_CODE (decl) == VAR_DECL); | |
280 | gcc_assert (!DECL_REALLY_EXTERN (decl)); | |
caa6fdce | 281 | |
282 | /* When not using the repository, emit everything. */ | |
283 | if (!flag_use_repository) | |
284 | return 2; | |
285 | ||
286 | /* Only template instantiations are managed by the repository. This | |
287 | is an artificial restriction; the code in the prelinker and here | |
288 | will work fine if all entities with vague linkage are managed by | |
289 | the repository. */ | |
290 | if (TREE_CODE (decl) == VAR_DECL) | |
291 | { | |
292 | tree type = NULL_TREE; | |
293 | if (DECL_VTABLE_OR_VTT_P (decl)) | |
294 | type = DECL_CONTEXT (decl); | |
295 | else if (DECL_TINFO_P (decl)) | |
296 | type = TREE_TYPE (DECL_NAME (decl)); | |
297 | if (!DECL_TEMPLATE_INSTANTIATION (decl) | |
c40c1730 | 298 | && (!TYPE_LANG_SPECIFIC (type) |
299 | || !CLASSTYPE_TEMPLATE_INSTANTIATION (type))) | |
caa6fdce | 300 | return 2; |
301 | } | |
302 | else if (!DECL_TEMPLATE_INSTANTIATION (decl)) | |
303 | return 2; | |
304 | ||
305 | /* For constructors and destructors, the repository contains | |
306 | information about the clones -- not the original function -- | |
307 | because only the clones are emitted in the object file. */ | |
308 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl) | |
309 | || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl)) | |
310 | { | |
311 | int emit_p = 0; | |
312 | tree clone; | |
313 | /* There is no early exit from this loop because we want to | |
314 | ensure that all of the clones are marked as available in this | |
315 | object file. */ | |
316 | FOR_EACH_CLONE (clone, decl) | |
317 | /* The only possible results from the recursive call to | |
318 | repo_emit_p are 0 or 1. */ | |
319 | if (repo_emit_p (clone)) | |
320 | emit_p = 1; | |
321 | return emit_p; | |
322 | } | |
323 | ||
324 | /* Keep track of all available entities. */ | |
325 | if (!DECL_REPO_AVAILABLE_P (decl)) | |
326 | { | |
327 | DECL_REPO_AVAILABLE_P (decl) = 1; | |
328 | pending_repo = tree_cons (NULL_TREE, decl, pending_repo); | |
329 | } | |
330 | ||
331 | return IDENTIFIER_REPO_CHOSEN (DECL_ASSEMBLER_NAME (decl)); | |
332 | } | |
333 | ||
334 | /* Returns true iff the prelinker has explicitly marked CLASS_TYPE for | |
335 | export from this translation unit. */ | |
336 | ||
337 | bool | |
338 | repo_export_class_p (tree class_type) | |
339 | { | |
340 | if (!flag_use_repository) | |
341 | return false; | |
342 | if (!CLASSTYPE_VTABLES (class_type)) | |
343 | return false; | |
344 | /* If the virtual table has been assigned to this translation unit, | |
345 | export the class. */ | |
9031d10b | 346 | return (IDENTIFIER_REPO_CHOSEN |
caa6fdce | 347 | (DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (class_type)))); |
348 | } | |
349 | ||
1f3233d1 | 350 | #include "gt-cp-repo.h" |