gcc/cp/repo.c

   1 /* Code to maintain a C++ template repository.
   2    Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003
   3    Free Software Foundation, Inc.
   4    Contributed by Jason Merrill (jason@cygnus.com)
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   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
  13 GCC is distributed in the hope that it will be useful,
  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
  19 along with GCC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  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
  27    explicit code.  */
  28
  29 #include "config.h"
  30 #include "system.h"
  31 #include "coretypes.h"
  32 #include "tm.h"
  33 #include "tree.h"
  34 #include "cp-tree.h"
  35 #include "input.h"
  36 #include "obstack.h"
  37 #include "toplev.h"
  38 #include "diagnostic.h"
  39
  40 static tree repo_get_id (tree);
  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);
  46
  47 static GTY(()) tree pending_repo;
  48 static GTY(()) tree original_repo;
  49 static char *repo_name;
  50 static FILE *repo_file;
  51
  52 static const char *old_args, *old_dir, *old_main;
  53
  54 static struct obstack temporary_obstack;
  55
  56 #define IDENTIFIER_REPO_USED(NODE)   (TREE_LANG_FLAG_3 (NODE))
  57 #define IDENTIFIER_REPO_CHOSEN(NODE) (TREE_LANG_FLAG_4 (NODE))
  58
  59 #if 0
  60 /* Record the flags used to compile this translation unit.  */
  61
  62 void
  63 repo_compile_flags (int argc, char **argv)
  64 {
  65 }
  66
  67 /* If this template has not been seen before, add a note to the repository
  68    saying where the declaration was.  This may be used to find the
  69    definition at link time.  */
  70
  71 void
  72 repo_template_declared (tree t)
  73 {}
  74
  75 /* Note where the definition of a template lives so that instantiations can
  76    be generated later.  */
  77
  78 void
  79 repo_template_defined (tree t)
  80 {}
  81
  82 /* Note where the definition of a class lives to that template
  83    instantiations can use it.  */
  84
  85 void
  86 repo_class_defined (tree t)
  87 {}
  88 #endif
  89
  90 static tree
  91 repo_get_id (tree t)
  92 {
  93   if (TYPE_P (t))
  94     {
  95       tree vtable;
  96
  97       /* If we're not done setting up the class, we may not have set up
  98          the vtable, so going ahead would give the wrong answer.
  99          See g++.pt/instantiate4.C.  */
 100       if (!COMPLETE_TYPE_P (t) || TYPE_BEING_DEFINED (t))
 101         abort ();
 102
 103       vtable = get_vtbl_decl_for_binfo (TYPE_BINFO (t));
 104
 105       t = vtable;
 106       if (t == NULL_TREE)
 107         return t;
 108     }
 109   return DECL_ASSEMBLER_NAME (t);
 110 }
 111
 112 /* Note that a template has been used.  If we can see the definition, offer
 113    to emit it.  */
 114
 115 void
 116 repo_template_used (tree t)
 117 {
 118   tree id;
 119
 120   if (! flag_use_repository)
 121     return;
 122
 123   id = repo_get_id (t);
 124   if (id == NULL_TREE)
 125     return;
 126
 127   if (TYPE_P (t))
 128     {
 129       if (IDENTIFIER_REPO_CHOSEN (id))
 130         mark_class_instantiated (t, 0);
 131     }
 132   else if (DECL_P (t))
 133     {
 134       if (IDENTIFIER_REPO_CHOSEN (id))
 135         /* It doesn't make sense to instantiate a clone, so we
 136            instantiate the cloned function instead.  Note that this
 137            approach will not work correctly if collect2 assigns
 138            different clones to different files -- but it shouldn't.  */
 139         mark_decl_instantiated (DECL_CLONED_FUNCTION_P (t)
 140                                 ? DECL_CLONED_FUNCTION (t) : t,
 141                                 0);
 142     }
 143   else
 144     abort ();
 145
 146   if (! IDENTIFIER_REPO_USED (id))
 147     {
 148       IDENTIFIER_REPO_USED (id) = 1;
 149       pending_repo = tree_cons (NULL_TREE, id, pending_repo);
 150     }
 151 }
 152
 153 #if 0
 154 /* Note that the vtable for a class has been used, and offer to emit it.  */
 155
 156 static void
 157 repo_vtable_used (tree t)
 158 {
 159   if (! flag_use_repository)
 160     return;
 161
 162   pending_repo = tree_cons (NULL_TREE, t, pending_repo);
 163 }
 164
 165 /* Note that an inline with external linkage has been used, and offer to
 166    emit it.  */
 167
 168 void
 169 repo_inline_used (tree fn)
 170 {
 171   if (! flag_use_repository)
 172     return;
 173
 174   /* Member functions of polymorphic classes go with their vtables.  */
 175   if (DECL_FUNCTION_MEMBER_P (fn)
 176       && TYPE_POLYMORPHIC_P (DECL_CONTEXT (fn)))
 177     {
 178       repo_vtable_used (DECL_CONTEXT (fn));
 179       return;
 180     }
 181
 182   pending_repo = tree_cons (NULL_TREE, fn, pending_repo);
 183 }
 184
 185 /* Note that a particular typeinfo node has been used, and offer to
 186    emit it.  */
 187
 188 void
 189 repo_tinfo_used (tree ti)
 190 {
 191 }
 192 #endif
 193
 194 void
 195 repo_template_instantiated (tree t, bool extern_p)
 196 {
 197   if (! extern_p)
 198     {
 199       tree id = repo_get_id (t);
 200       if (id)
 201         IDENTIFIER_REPO_CHOSEN (id) = 1;
 202     }
 203 }
 204
 205 /* Parse a reasonable subset of shell quoting syntax.  */
 206
 207 static char *
 208 extract_string (char **pp)
 209 {
 210   char *p = *pp;
 211   int backquote = 0;
 212   int inside = 0;
 213
 214   for (;;)
 215     {
 216       char c = *p;
 217       if (c == '\0')
 218         break;
 219       ++p;
 220       if (backquote)
 221         obstack_1grow (&temporary_obstack, c);
 222       else if (! inside && c == ' ')
 223         break;
 224       else if (! inside && c == '\\')
 225         backquote = 1;
 226       else if (c == '\'')
 227         inside = !inside;
 228       else
 229         obstack_1grow (&temporary_obstack, c);
 230     }
 231
 232   obstack_1grow (&temporary_obstack, '\0');
 233   *pp = p;
 234   return obstack_finish (&temporary_obstack);
 235 }
 236
 237 static const char *
 238 get_base_filename (const char *filename)
 239 {
 240   char *p = getenv ("COLLECT_GCC_OPTIONS");
 241   char *output = NULL;
 242   int compiling = 0;
 243
 244   while (p && *p)
 245     {
 246       char *q = extract_string (&p);
 247
 248       if (strcmp (q, "-o") == 0)
 249         output = extract_string (&p);
 250       else if (strcmp (q, "-c") == 0)
 251         compiling = 1;
 252       }
 253
 254   if (compiling && output)
 255     return output;
 256
 257   if (p && ! compiling)
 258     {
 259       warning ("-frepo must be used with -c");
 260       flag_use_repository = 0;
 261       return NULL;
 262     }
 263
 264   return lbasename (filename);
 265 }
 266
 267 static void
 268 open_repo_file (const char *filename)
 269 {
 270   const char *p;
 271   const char *s = get_base_filename (filename);
 272
 273   if (s == NULL)
 274     return;
 275
 276   p = lbasename (s);
 277   p = strrchr (p, '.');
 278   if (! p)
 279     p = s + strlen (s);
 280
 281   repo_name = xmalloc (p - s + 5);
 282   memcpy (repo_name, s, p - s);
 283   memcpy (repo_name + (p - s), ".rpo", 5);
 284
 285   repo_file = fopen (repo_name, "r");
 286 }
 287
 288 static char *
 289 afgets (FILE *stream)
 290 {
 291   int c;
 292   while ((c = getc (stream)) != EOF && c != '\n')
 293     obstack_1grow (&temporary_obstack, c);
 294   if (obstack_object_size (&temporary_obstack) == 0)
 295     return NULL;
 296   obstack_1grow (&temporary_obstack, '\0');
 297   return obstack_finish (&temporary_obstack);
 298 }
 299
 300 void
 301 init_repo (const char *filename)
 302 {
 303   char *buf;
 304
 305   if (! flag_use_repository)
 306     return;
 307
 308   gcc_obstack_init (&temporary_obstack);
 309
 310   open_repo_file (filename);
 311
 312   if (repo_file == 0)
 313     return;
 314
 315   while ((buf = afgets (repo_file)))
 316     {
 317       switch (buf[0])
 318         {
 319         case 'A':
 320           old_args = ggc_strdup (buf + 2);
 321           break;
 322         case 'D':
 323           old_dir = ggc_strdup (buf + 2);
 324           break;
 325         case 'M':
 326           old_main = ggc_strdup (buf + 2);
 327           break;
 328         case 'C':
 329         case 'O':
 330           {
 331             tree id = get_identifier (buf + 2);
 332             tree orig;
 333
 334             if (buf[0] == 'C')
 335               {
 336                 IDENTIFIER_REPO_CHOSEN (id) = 1;
 337                 orig = integer_one_node;
 338               }
 339             else
 340               orig = NULL_TREE;
 341
 342             original_repo = tree_cons (orig, id, original_repo);
 343           }
 344           break;
 345         default:
 346           error ("mysterious repository information in %s", repo_name);
 347         }
 348       obstack_free (&temporary_obstack, buf);
 349     }
 350 }
 351
 352 static void
 353 reopen_repo_file_for_write (void)
 354 {
 355   if (repo_file)
 356     fclose (repo_file);
 357   repo_file = fopen (repo_name, "w");
 358
 359   if (repo_file == 0)
 360     {
 361       error ("can't create repository information file `%s'", repo_name);
 362       flag_use_repository = 0;
 363     }
 364 }
 365
 366 /* Emit any pending repos.  */
 367
 368 void
 369 finish_repo (void)
 370 {
 371   tree t;
 372   bool repo_changed = false;
 373   char *dir, *args;
 374
 375   if (!flag_use_repository)
 376     return;
 377
 378   /* Do we have to write out a new info file?  */
 379
 380   /* Are there any old templates that aren't used any longer or that are
 381      newly chosen?  */
 382
 383   for (t = original_repo; t; t = TREE_CHAIN (t))
 384     {
 385       if (!IDENTIFIER_REPO_USED (TREE_VALUE (t))
 386           || (!TREE_PURPOSE (t) && IDENTIFIER_REPO_CHOSEN (TREE_VALUE (t))))
 387         {
 388           repo_changed = true;
 389           break;
 390         }
 391       IDENTIFIER_REPO_USED (TREE_VALUE (t)) = 0;
 392     }
 393
 394   /* Are there any templates that are newly used?  */
 395
 396   if (!repo_changed)
 397     for (t = pending_repo; t; t = TREE_CHAIN (t))
 398       {
 399         if (IDENTIFIER_REPO_USED (TREE_VALUE (t)))
 400           {
 401             repo_changed = true;
 402             break;
 403           }
 404       }
 405
 406   dir = getpwd ();
 407   args = getenv ("COLLECT_GCC_OPTIONS");
 408
 409   if (!repo_changed && pending_repo)
 410     if (strcmp (old_main, main_input_filename) != 0
 411         || strcmp (old_dir, dir) != 0
 412         || (args == NULL) != (old_args == NULL)
 413         || (args && strcmp (old_args, args) != 0))
 414       repo_changed = true;
 415
 416   if (!repo_changed || errorcount || sorrycount)
 417     goto out;
 418
 419   reopen_repo_file_for_write ();
 420
 421   if (repo_file == 0)
 422     goto out;
 423
 424   fprintf (repo_file, "M %s\n", main_input_filename);
 425   fprintf (repo_file, "D %s\n", dir);
 426   if (args)
 427     fprintf (repo_file, "A %s\n", args);
 428
 429   for (t = pending_repo; t; t = TREE_CHAIN (t))
 430     {
 431       tree val = TREE_VALUE (t);
 432       char type = IDENTIFIER_REPO_CHOSEN (val) ? 'C' : 'O';
 433
 434       fprintf (repo_file, "%c %s\n", type, IDENTIFIER_POINTER (val));
 435     }
 436
 437  out:
 438   if (repo_file)
 439     fclose (repo_file);
 440 }
 441
 442 #include "gt-cp-repo.h"