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bb09dca5 | 1 | /* Code to maintain a C++ template repository. |
711789cc | 2 | Copyright (C) 1995-2013 Free Software Foundation, Inc. |
bb09dca5 | 3 | Contributed by Jason Merrill (jason@cygnus.com) |
4 | ||
6f0d25a6 | 5 | This file is part of GCC. |
bb09dca5 | 6 | |
6f0d25a6 | 7 | GCC is free software; you can redistribute it and/or modify |
bb09dca5 | 8 | it under the terms of the GNU General Public License as published by |
aa139c3f | 9 | the Free Software Foundation; either version 3, or (at your option) |
bb09dca5 | 10 | any later version. |
11 | ||
6f0d25a6 | 12 | GCC is distributed in the hope that it will be useful, |
bb09dca5 | 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
aa139c3f | 18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
bb09dca5 | 20 | |
21 | /* My strategy here is as follows: | |
22 | ||
23 | Everything should be emitted in a translation unit where it is used. | |
24 | The results of the automatic process should be easily reproducible with | |
11682839 | 25 | explicit code. */ |
bb09dca5 | 26 | |
11682839 | 27 | #include "config.h" |
b3ef7553 | 28 | #include "system.h" |
805e22b2 | 29 | #include "coretypes.h" |
30 | #include "tm.h" | |
bb09dca5 | 31 | #include "tree.h" |
32 | #include "cp-tree.h" | |
33 | #include "input.h" | |
3e1ffd94 | 34 | #include "obstack.h" |
2a4e40b0 | 35 | #include "toplev.h" |
852f689e | 36 | #include "diagnostic-core.h" |
2c3e097e | 37 | #include "flags.h" |
bb09dca5 | 38 | |
3f24af9b | 39 | static const char *extract_string (const char **); |
26ac6687 | 40 | static const char *get_base_filename (const char *); |
8b35a404 | 41 | static FILE *open_repo_file (const char *); |
26ac6687 | 42 | static char *afgets (FILE *); |
8b35a404 | 43 | static FILE *reopen_repo_file_for_write (void); |
bb09dca5 | 44 | |
f1f41a6c | 45 | static GTY(()) vec<tree, va_gc> *pending_repo; |
3f7d79e4 | 46 | static char *repo_name; |
bb09dca5 | 47 | |
17dd1766 | 48 | static const char *old_args, *old_dir, *old_main; |
6686e84d | 49 | |
d7c47c0e | 50 | static struct obstack temporary_obstack; |
caa6fdce | 51 | static bool temporary_obstack_initialized_p; |
dc76caae | 52 | |
6686e84d | 53 | /* Parse a reasonable subset of shell quoting syntax. */ |
54 | ||
3f24af9b | 55 | static const char * |
56 | extract_string (const char **pp) | |
6686e84d | 57 | { |
3f24af9b | 58 | const char *p = *pp; |
6686e84d | 59 | int backquote = 0; |
60 | int inside = 0; | |
61 | ||
62 | for (;;) | |
63 | { | |
64 | char c = *p; | |
65 | if (c == '\0') | |
66 | break; | |
67 | ++p; | |
68 | if (backquote) | |
4840a255 | 69 | { |
70 | obstack_1grow (&temporary_obstack, c); | |
71 | backquote = 0; | |
72 | } | |
6686e84d | 73 | else if (! inside && c == ' ') |
74 | break; | |
75 | else if (! inside && c == '\\') | |
76 | backquote = 1; | |
77 | else if (c == '\'') | |
78 | inside = !inside; | |
79 | else | |
80 | obstack_1grow (&temporary_obstack, c); | |
81 | } | |
82 | ||
83 | obstack_1grow (&temporary_obstack, '\0'); | |
84 | *pp = p; | |
4e41d774 | 85 | return (char *) obstack_finish (&temporary_obstack); |
6686e84d | 86 | } |
87 | ||
9140e457 | 88 | static const char * |
26ac6687 | 89 | get_base_filename (const char *filename) |
11682839 | 90 | { |
3f24af9b | 91 | const char *p = getenv ("COLLECT_GCC_OPTIONS"); |
71278019 | 92 | const char *output = NULL; |
11682839 | 93 | int compiling = 0; |
94 | ||
6686e84d | 95 | while (p && *p) |
96 | { | |
3f24af9b | 97 | const char *q = extract_string (&p); |
11682839 | 98 | |
6686e84d | 99 | if (strcmp (q, "-o") == 0) |
71278019 | 100 | { |
101 | if (flag_compare_debug) | |
102 | /* Just in case aux_base_name was based on a name with two | |
103 | or more '.'s, add an arbitrary extension that will be | |
104 | stripped by the caller. */ | |
105 | output = concat (aux_base_name, ".o", NULL); | |
106 | else | |
107 | output = extract_string (&p); | |
108 | } | |
6686e84d | 109 | else if (strcmp (q, "-c") == 0) |
110 | compiling = 1; | |
4840a255 | 111 | } |
11682839 | 112 | |
113 | if (compiling && output) | |
114 | return output; | |
115 | ||
3e1ffd94 | 116 | if (p && ! compiling) |
117 | { | |
c3ceba8e | 118 | warning (0, "-frepo must be used with -c"); |
3e1ffd94 | 119 | flag_use_repository = 0; |
120 | return NULL; | |
121 | } | |
122 | ||
40275504 | 123 | return lbasename (filename); |
9031d10b | 124 | } |
11682839 | 125 | |
8b35a404 | 126 | static FILE * |
26ac6687 | 127 | open_repo_file (const char *filename) |
bb09dca5 | 128 | { |
cd16867a | 129 | const char *p; |
e1721763 | 130 | const char *s = get_base_filename (filename); |
3e1ffd94 | 131 | |
3f7d79e4 | 132 | if (s == NULL) |
8b35a404 | 133 | return NULL; |
3e1ffd94 | 134 | |
40275504 | 135 | p = lbasename (s); |
78dbff7c | 136 | p = strrchr (p, '.'); |
3f7d79e4 | 137 | if (! p) |
138 | p = s + strlen (s); | |
bb09dca5 | 139 | |
56e60747 | 140 | repo_name = XNEWVEC (char, p - s + 5); |
92192583 | 141 | memcpy (repo_name, s, p - s); |
142 | memcpy (repo_name + (p - s), ".rpo", 5); | |
bb09dca5 | 143 | |
8b35a404 | 144 | return fopen (repo_name, "r"); |
bb09dca5 | 145 | } |
146 | ||
3f7d79e4 | 147 | static char * |
26ac6687 | 148 | afgets (FILE *stream) |
3f7d79e4 | 149 | { |
150 | int c; | |
151 | while ((c = getc (stream)) != EOF && c != '\n') | |
152 | obstack_1grow (&temporary_obstack, c); | |
153 | if (obstack_object_size (&temporary_obstack) == 0) | |
154 | return NULL; | |
155 | obstack_1grow (&temporary_obstack, '\0'); | |
4e41d774 | 156 | return (char *) obstack_finish (&temporary_obstack); |
3f7d79e4 | 157 | } |
158 | ||
bb09dca5 | 159 | void |
caa6fdce | 160 | init_repo (void) |
bb09dca5 | 161 | { |
3f7d79e4 | 162 | char *buf; |
3f24af9b | 163 | const char *p; |
8b35a404 | 164 | FILE *repo_file; |
bb09dca5 | 165 | |
166 | if (! flag_use_repository) | |
167 | return; | |
168 | ||
caa6fdce | 169 | /* When a PCH file is loaded, the entire identifier table is |
170 | replaced, with the result that IDENTIFIER_REPO_CHOSEN is cleared. | |
171 | So, we have to reread the repository file. */ | |
172 | lang_post_pch_load = init_repo; | |
173 | ||
174 | if (!temporary_obstack_initialized_p) | |
175 | gcc_obstack_init (&temporary_obstack); | |
1e4853c2 | 176 | |
8b35a404 | 177 | repo_file = open_repo_file (main_input_filename); |
bb09dca5 | 178 | |
179 | if (repo_file == 0) | |
180 | return; | |
181 | ||
034b484a | 182 | while ((buf = afgets (repo_file))) |
bb09dca5 | 183 | { |
bb09dca5 | 184 | switch (buf[0]) |
185 | { | |
186 | case 'A': | |
92192583 | 187 | old_args = ggc_strdup (buf + 2); |
6686e84d | 188 | break; |
3f7d79e4 | 189 | case 'D': |
92192583 | 190 | old_dir = ggc_strdup (buf + 2); |
6686e84d | 191 | break; |
bb09dca5 | 192 | case 'M': |
92192583 | 193 | old_main = ggc_strdup (buf + 2); |
bb09dca5 | 194 | break; |
bb09dca5 | 195 | case 'O': |
caa6fdce | 196 | /* A symbol that we were able to define the last time this |
197 | file was compiled. */ | |
198 | break; | |
199 | case 'C': | |
200 | /* A symbol that the prelinker has requested that we | |
201 | define. */ | |
bb09dca5 | 202 | { |
3f7d79e4 | 203 | tree id = get_identifier (buf + 2); |
caa6fdce | 204 | IDENTIFIER_REPO_CHOSEN (id) = 1; |
bb09dca5 | 205 | } |
206 | break; | |
207 | default: | |
905d4035 | 208 | error ("mysterious repository information in %s", repo_name); |
bb09dca5 | 209 | } |
3f7d79e4 | 210 | obstack_free (&temporary_obstack, buf); |
bb09dca5 | 211 | } |
caa6fdce | 212 | fclose (repo_file); |
b6c1bd72 | 213 | |
214 | if (old_args && !get_random_seed (true) | |
3f24af9b | 215 | && (p = strstr (old_args, "'-frandom-seed="))) |
216 | set_random_seed (extract_string (&p) + strlen ("-frandom-seed=")); | |
bb09dca5 | 217 | } |
218 | ||
8b35a404 | 219 | static FILE * |
26ac6687 | 220 | reopen_repo_file_for_write (void) |
bb09dca5 | 221 | { |
8b35a404 | 222 | FILE *repo_file = fopen (repo_name, "w"); |
bb09dca5 | 223 | |
224 | if (repo_file == 0) | |
225 | { | |
bf776685 | 226 | error ("can%'t create repository information file %qs", repo_name); |
bb09dca5 | 227 | flag_use_repository = 0; |
228 | } | |
8b35a404 | 229 | |
230 | return repo_file; | |
bb09dca5 | 231 | } |
232 | ||
233 | /* Emit any pending repos. */ | |
234 | ||
235 | void | |
26ac6687 | 236 | finish_repo (void) |
bb09dca5 | 237 | { |
b640afb8 | 238 | tree val; |
6686e84d | 239 | char *dir, *args; |
8b35a404 | 240 | FILE *repo_file; |
b640afb8 | 241 | unsigned ix; |
bb09dca5 | 242 | |
71278019 | 243 | if (!flag_use_repository || flag_compare_debug) |
bb09dca5 | 244 | return; |
245 | ||
852f689e | 246 | if (seen_error ()) |
8b35a404 | 247 | return; |
bb09dca5 | 248 | |
8b35a404 | 249 | repo_file = reopen_repo_file_for_write (); |
bb09dca5 | 250 | if (repo_file == 0) |
251 | goto out; | |
252 | ||
11682839 | 253 | fprintf (repo_file, "M %s\n", main_input_filename); |
caa6fdce | 254 | dir = getpwd (); |
6686e84d | 255 | fprintf (repo_file, "D %s\n", dir); |
caa6fdce | 256 | args = getenv ("COLLECT_GCC_OPTIONS"); |
6686e84d | 257 | if (args) |
2c3e097e | 258 | { |
259 | fprintf (repo_file, "A %s", args); | |
260 | /* If -frandom-seed is not among the ARGS, then add the value | |
261 | that we chose. That will ensure that the names of types from | |
262 | anonymous namespaces will get the same mangling when this | |
263 | file is recompiled. */ | |
264 | if (!strstr (args, "'-frandom-seed=")) | |
badc6cfa | 265 | fprintf (repo_file, " '-frandom-seed=" HOST_WIDE_INT_PRINT_HEX_PURE "'", |
266 | get_random_seed (false)); | |
2c3e097e | 267 | fprintf (repo_file, "\n"); |
268 | } | |
11682839 | 269 | |
f1f41a6c | 270 | FOR_EACH_VEC_SAFE_ELT_REVERSE (pending_repo, ix, val) |
bb09dca5 | 271 | { |
caa6fdce | 272 | tree name = DECL_ASSEMBLER_NAME (val); |
273 | char type = IDENTIFIER_REPO_CHOSEN (name) ? 'C' : 'O'; | |
274 | fprintf (repo_file, "%c %s\n", type, IDENTIFIER_POINTER (name)); | |
bb09dca5 | 275 | } |
276 | ||
277 | out: | |
278 | if (repo_file) | |
279 | fclose (repo_file); | |
280 | } | |
1f3233d1 | 281 | |
caa6fdce | 282 | /* DECL is a FUNCTION_DECL or VAR_DECL with vague linkage whose |
283 | definition is available in this translation unit. Returns 0 if | |
284 | this definition should not be emitted in this translation unit | |
285 | because it will be emitted elsewhere. Returns 1 if the repository | |
286 | file indicates that that DECL should be emitted in this translation | |
287 | unit, or 2 if the repository file is not in use. */ | |
288 | ||
289 | int | |
290 | repo_emit_p (tree decl) | |
291 | { | |
7133f4fc | 292 | int ret = 0; |
b4df430b | 293 | gcc_assert (TREE_PUBLIC (decl)); |
4cace8cb | 294 | gcc_assert (VAR_OR_FUNCTION_DECL_P (decl)); |
b4df430b | 295 | gcc_assert (!DECL_REALLY_EXTERN (decl)); |
caa6fdce | 296 | |
297 | /* When not using the repository, emit everything. */ | |
298 | if (!flag_use_repository) | |
299 | return 2; | |
300 | ||
301 | /* Only template instantiations are managed by the repository. This | |
302 | is an artificial restriction; the code in the prelinker and here | |
303 | will work fine if all entities with vague linkage are managed by | |
304 | the repository. */ | |
305 | if (TREE_CODE (decl) == VAR_DECL) | |
306 | { | |
307 | tree type = NULL_TREE; | |
308 | if (DECL_VTABLE_OR_VTT_P (decl)) | |
309 | type = DECL_CONTEXT (decl); | |
310 | else if (DECL_TINFO_P (decl)) | |
311 | type = TREE_TYPE (DECL_NAME (decl)); | |
312 | if (!DECL_TEMPLATE_INSTANTIATION (decl) | |
c40c1730 | 313 | && (!TYPE_LANG_SPECIFIC (type) |
314 | || !CLASSTYPE_TEMPLATE_INSTANTIATION (type))) | |
caa6fdce | 315 | return 2; |
af3f756d | 316 | /* Const static data members initialized by constant expressions must |
b3cee199 | 317 | be processed where needed so that their definitions are |
7133f4fc | 318 | available. Still record them into *.rpo files, so if they |
319 | weren't actually emitted and collect2 requests them, they can | |
320 | be provided. */ | |
d58b8a94 | 321 | if (decl_maybe_constant_var_p (decl) |
b3cee199 | 322 | && DECL_CLASS_SCOPE_P (decl)) |
7133f4fc | 323 | ret = 2; |
caa6fdce | 324 | } |
325 | else if (!DECL_TEMPLATE_INSTANTIATION (decl)) | |
326 | return 2; | |
327 | ||
af3f756d | 328 | if (DECL_EXPLICIT_INSTANTIATION (decl)) |
329 | return 2; | |
330 | ||
caa6fdce | 331 | /* For constructors and destructors, the repository contains |
332 | information about the clones -- not the original function -- | |
333 | because only the clones are emitted in the object file. */ | |
334 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl) | |
335 | || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl)) | |
336 | { | |
337 | int emit_p = 0; | |
338 | tree clone; | |
339 | /* There is no early exit from this loop because we want to | |
340 | ensure that all of the clones are marked as available in this | |
341 | object file. */ | |
342 | FOR_EACH_CLONE (clone, decl) | |
343 | /* The only possible results from the recursive call to | |
344 | repo_emit_p are 0 or 1. */ | |
345 | if (repo_emit_p (clone)) | |
346 | emit_p = 1; | |
347 | return emit_p; | |
348 | } | |
349 | ||
350 | /* Keep track of all available entities. */ | |
351 | if (!DECL_REPO_AVAILABLE_P (decl)) | |
352 | { | |
353 | DECL_REPO_AVAILABLE_P (decl) = 1; | |
f1f41a6c | 354 | vec_safe_push (pending_repo, decl); |
caa6fdce | 355 | } |
356 | ||
7133f4fc | 357 | return IDENTIFIER_REPO_CHOSEN (DECL_ASSEMBLER_NAME (decl)) ? 1 : ret; |
caa6fdce | 358 | } |
359 | ||
360 | /* Returns true iff the prelinker has explicitly marked CLASS_TYPE for | |
361 | export from this translation unit. */ | |
362 | ||
363 | bool | |
9f627b1a | 364 | repo_export_class_p (const_tree class_type) |
caa6fdce | 365 | { |
366 | if (!flag_use_repository) | |
367 | return false; | |
368 | if (!CLASSTYPE_VTABLES (class_type)) | |
369 | return false; | |
370 | /* If the virtual table has been assigned to this translation unit, | |
371 | export the class. */ | |
9031d10b | 372 | return (IDENTIFIER_REPO_CHOSEN |
caa6fdce | 373 | (DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (class_type)))); |
374 | } | |
375 | ||
1f3233d1 | 376 | #include "gt-cp-repo.h" |