gcc/plugin.c

   1 /* Support for GCC plugin mechanism.
   2    Copyright (C) 2009-2014 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  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
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 /* This file contains the support for GCC plugin mechanism based on the
  21    APIs described in doc/plugin.texi.  */
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "hash-table.h"
  27 #include "diagnostic-core.h"
  28 #include "tree.h"
  29 #include "tree-pass.h"
  30 #include "intl.h"
  31 #include "plugin.h"
  32 #include "ggc.h"
  33
  34 #ifdef ENABLE_PLUGIN
  35 #include "plugin-version.h"
  36 #endif
  37
  38 #define GCC_PLUGIN_STRINGIFY0(X) #X
  39 #define GCC_PLUGIN_STRINGIFY1(X) GCC_PLUGIN_STRINGIFY0 (X)
  40
  41 /* Event names as strings.  Keep in sync with enum plugin_event.  */
  42 static const char *plugin_event_name_init[] =
  43 {
  44 # define DEFEVENT(NAME) GCC_PLUGIN_STRINGIFY1 (NAME),
  45 # include "plugin.def"
  46 # undef DEFEVENT
  47 };
  48
  49 /* A printf format large enough for the largest event above.  */
  50 #define FMT_FOR_PLUGIN_EVENT "%-32s"
  51
  52 const char **plugin_event_name = plugin_event_name_init;
  53
  54 /* Event hashtable helpers.  */
  55
  56 struct event_hasher : typed_noop_remove <const char *>
  57 {
  58   typedef const char *value_type;
  59   typedef const char *compare_type;
  60   static inline hashval_t hash (const value_type *);
  61   static inline bool equal (const value_type *, const compare_type *);
  62 };
  63
  64 /* Helper function for the event hash table that hashes the entry V.  */
  65
  66 inline hashval_t
  67 event_hasher::hash (const value_type *v)
  68 {
  69   return htab_hash_string (*v);
  70 }
  71
  72 /* Helper function for the event hash table that compares the name of an
  73    existing entry (S1) with the given string (S2).  */
  74
  75 inline bool
  76 event_hasher::equal (const value_type *s1, const compare_type *s2)
  77 {
  78   return !strcmp (*s1, *s2);
  79 }
  80
  81 /* A hash table to map event names to the position of the names in the
  82    plugin_event_name table.  */
  83 static hash_table<event_hasher> *event_tab;
  84
  85 /* Keep track of the limit of allocated events and space ready for
  86    allocating events.  */
  87 static int event_last = PLUGIN_EVENT_FIRST_DYNAMIC;
  88 static int event_horizon = PLUGIN_EVENT_FIRST_DYNAMIC;
  89
  90 /* Hash table for the plugin_name_args objects created during command-line
  91    parsing.  */
  92 static htab_t plugin_name_args_tab = NULL;
  93
  94 /* List node for keeping track of plugin-registered callback.  */
  95 struct callback_info
  96 {
  97   const char *plugin_name;   /* Name of plugin that registers the callback.  */
  98   plugin_callback_func func; /* Callback to be called.  */
  99   void *user_data;           /* plugin-specified data.  */
 100   struct callback_info *next;
 101 };
 102
 103 /* An array of lists of 'callback_info' objects indexed by the event id.  */
 104 static struct callback_info *plugin_callbacks_init[PLUGIN_EVENT_FIRST_DYNAMIC];
 105 static struct callback_info **plugin_callbacks = plugin_callbacks_init;
 106
 107 /* For invoke_plugin_callbacks(), see plugin.h.  */
 108 bool flag_plugin_added = false;
 109
 110 #ifdef ENABLE_PLUGIN
 111 /* Each plugin should define an initialization function with exactly
 112    this name.  */
 113 static const char *str_plugin_init_func_name = "plugin_init";
 114
 115 /* Each plugin should define this symbol to assert that it is
 116    distributed under a GPL-compatible license.  */
 117 static const char *str_license = "plugin_is_GPL_compatible";
 118 #endif
 119
 120 /* Helper function for the hash table that compares the base_name of the
 121    existing entry (S1) with the given string (S2).  */
 122
 123 static int
 124 htab_str_eq (const void *s1, const void *s2)
 125 {
 126   const struct plugin_name_args *plugin = (const struct plugin_name_args *) s1;
 127   return !strcmp (plugin->base_name, (const char *) s2);
 128 }
 129
 130
 131 /* Given a plugin's full-path name FULL_NAME, e.g. /pass/to/NAME.so,
 132    return NAME.  */
 133
 134 static char *
 135 get_plugin_base_name (const char *full_name)
 136 {
 137   /* First get the base name part of the full-path name, i.e. NAME.so.  */
 138   char *base_name = xstrdup (lbasename (full_name));
 139
 140   /* Then get rid of '.so' part of the name.  */
 141   strip_off_ending (base_name, strlen (base_name));
 142
 143   return base_name;
 144 }
 145
 146
 147 /* Create a plugin_name_args object for the given plugin and insert it
 148    to the hash table. This function is called when
 149    -fplugin=/path/to/NAME.so or -fplugin=NAME option is processed.  */
 150
 151 void
 152 add_new_plugin (const char* plugin_name)
 153 {
 154   struct plugin_name_args *plugin;
 155   void **slot;
 156   char *base_name;
 157   bool name_is_short;
 158   const char *pc;
 159
 160   flag_plugin_added = true;
 161
 162   /* Replace short names by their full path when relevant.  */
 163   name_is_short  = !IS_ABSOLUTE_PATH (plugin_name);
 164   for (pc = plugin_name; name_is_short && *pc; pc++)
 165     if (*pc == '.' || IS_DIR_SEPARATOR (*pc))
 166       name_is_short = false;
 167
 168   if (name_is_short)
 169     {
 170       base_name = CONST_CAST (char*, plugin_name);
 171       /* FIXME: the ".so" suffix is currently builtin, since plugins
 172          only work on ELF host systems like e.g. Linux or Solaris.
 173          When plugins shall be available on non ELF systems such as
 174          Windows or MacOS, this code has to be greatly improved.  */
 175       plugin_name = concat (default_plugin_dir_name (), "/",
 176                             plugin_name, ".so", NULL);
 177       if (access (plugin_name, R_OK))
 178         fatal_error
 179           ("inaccessible plugin file %s expanded from short plugin name %s: %m",
 180            plugin_name, base_name);
 181     }
 182   else
 183     base_name = get_plugin_base_name (plugin_name);
 184
 185   /* If this is the first -fplugin= option we encounter, create
 186      'plugin_name_args_tab' hash table.  */
 187   if (!plugin_name_args_tab)
 188     plugin_name_args_tab = htab_create (10, htab_hash_string, htab_str_eq,
 189                                         NULL);
 190
 191   slot = htab_find_slot (plugin_name_args_tab, base_name, INSERT);
 192
 193   /* If the same plugin (name) has been specified earlier, either emit an
 194      error or a warning message depending on if they have identical full
 195      (path) names.  */
 196   if (*slot)
 197     {
 198       plugin = (struct plugin_name_args *) *slot;
 199       if (strcmp (plugin->full_name, plugin_name))
 200         error ("plugin %s was specified with different paths:\n%s\n%s",
 201                plugin->base_name, plugin->full_name, plugin_name);
 202       return;
 203     }
 204
 205   plugin = XCNEW (struct plugin_name_args);
 206   plugin->base_name = base_name;
 207   plugin->full_name = plugin_name;
 208
 209   *slot = plugin;
 210 }
 211
 212
 213 /* Parse the -fplugin-arg-<name>-<key>[=<value>] option and create a
 214    'plugin_argument' object for the parsed key-value pair. ARG is
 215    the <name>-<key>[=<value>] part of the option.  */
 216
 217 void
 218 parse_plugin_arg_opt (const char *arg)
 219 {
 220   size_t len = 0, name_len = 0, key_len = 0, value_len = 0;
 221   const char *ptr, *name_start = arg, *key_start = NULL, *value_start = NULL;
 222   char *name, *key, *value;
 223   void **slot;
 224   bool name_parsed = false, key_parsed = false;
 225
 226   /* Iterate over the ARG string and identify the starting character position
 227      of 'name', 'key', and 'value' and their lengths.  */
 228   for (ptr = arg; *ptr; ++ptr)
 229     {
 230       /* Only the first '-' encountered is considered a separator between
 231          'name' and 'key'. All the subsequent '-'s are considered part of
 232          'key'. For example, given -fplugin-arg-foo-bar-primary-key=value,
 233          the plugin name is 'foo' and the key is 'bar-primary-key'.  */
 234       if (*ptr == '-' && !name_parsed)
 235         {
 236           name_len = len;
 237           len = 0;
 238           key_start = ptr + 1;
 239           name_parsed = true;
 240           continue;
 241         }
 242       else if (*ptr == '=')
 243         {
 244           if (!key_parsed)
 245             {
 246               key_len = len;
 247               len = 0;
 248               value_start = ptr + 1;
 249               key_parsed = true;
 250             }
 251           continue;
 252         }
 253       else
 254         ++len;
 255     }
 256
 257   if (!key_start)
 258     {
 259       error ("malformed option -fplugin-arg-%s (missing -<key>[=<value>])",
 260              arg);
 261       return;
 262     }
 263
 264   /* If the option doesn't contain the 'value' part, LEN is the KEY_LEN.
 265      Otherwise, it is the VALUE_LEN.  */
 266   if (!value_start)
 267     key_len = len;
 268   else
 269     value_len = len;
 270
 271   name = XNEWVEC (char, name_len + 1);
 272   strncpy (name, name_start, name_len);
 273   name[name_len] = '\0';
 274
 275   /* Check if the named plugin has already been specified earlier in the
 276      command-line.  */
 277   if (plugin_name_args_tab
 278       && ((slot = htab_find_slot (plugin_name_args_tab, name, NO_INSERT))
 279           != NULL))
 280     {
 281       struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
 282
 283       key = XNEWVEC (char, key_len + 1);
 284       strncpy (key, key_start, key_len);
 285       key[key_len] = '\0';
 286       if (value_start)
 287         {
 288           value = XNEWVEC (char, value_len + 1);
 289           strncpy (value, value_start, value_len);
 290           value[value_len] = '\0';
 291         }
 292       else
 293         value = NULL;
 294
 295       /* Create a plugin_argument object for the parsed key-value pair.
 296          If there are already arguments for this plugin, we will need to
 297          adjust the argument array size by creating a new array and deleting
 298          the old one. If the performance ever becomes an issue, we can
 299          change the code by pre-allocating a larger array first.  */
 300       if (plugin->argc > 0)
 301         {
 302           struct plugin_argument *args = XNEWVEC (struct plugin_argument,
 303                                                   plugin->argc + 1);
 304           memcpy (args, plugin->argv,
 305                   sizeof (struct plugin_argument) * plugin->argc);
 306           XDELETEVEC (plugin->argv);
 307           plugin->argv = args;
 308           ++plugin->argc;
 309         }
 310       else
 311         {
 312           gcc_assert (plugin->argv == NULL);
 313           plugin->argv = XNEWVEC (struct plugin_argument, 1);
 314           plugin->argc = 1;
 315         }
 316
 317       plugin->argv[plugin->argc - 1].key = key;
 318       plugin->argv[plugin->argc - 1].value = value;
 319     }
 320   else
 321     error ("plugin %s should be specified before -fplugin-arg-%s "
 322            "in the command line", name, arg);
 323
 324   /* We don't need the plugin's name anymore. Just release it.  */
 325   XDELETEVEC (name);
 326 }
 327
 328 /* Register additional plugin information. NAME is the name passed to
 329    plugin_init. INFO is the information that should be registered. */
 330
 331 static void
 332 register_plugin_info (const char* name, struct plugin_info *info)
 333 {
 334   void **slot = htab_find_slot (plugin_name_args_tab, name, NO_INSERT);
 335   struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
 336   plugin->version = info->version;
 337   plugin->help = info->help;
 338 }
 339
 340 /* Look up the event id for NAME.  If the name is not found, return -1
 341    if INSERT is NO_INSERT.  */
 342
 343 int
 344 get_named_event_id (const char *name, enum insert_option insert)
 345 {
 346   const char ***slot;
 347
 348   if (!event_tab)
 349     {
 350       int i;
 351
 352       event_tab = new hash_table<event_hasher> (150);
 353       for (i = 0; i < event_last; i++)
 354         {
 355           slot = event_tab->find_slot (&plugin_event_name[i], INSERT);
 356           gcc_assert (*slot == HTAB_EMPTY_ENTRY);
 357           *slot = &plugin_event_name[i];
 358         }
 359     }
 360   slot = event_tab->find_slot (&name, insert);
 361   if (slot == NULL)
 362     return -1;
 363   if (*slot != HTAB_EMPTY_ENTRY)
 364     return *slot - &plugin_event_name[0];
 365
 366   if (event_last >= event_horizon)
 367     {
 368       event_horizon = event_last * 2;
 369       if (plugin_event_name == plugin_event_name_init)
 370         {
 371           plugin_event_name = XNEWVEC (const char *, event_horizon);
 372           memcpy (plugin_event_name, plugin_event_name_init,
 373                   sizeof plugin_event_name_init);
 374           plugin_callbacks = XNEWVEC (struct callback_info *, event_horizon);
 375           memcpy (plugin_callbacks, plugin_callbacks_init,
 376                   sizeof plugin_callbacks_init);
 377         }
 378       else
 379         {
 380           plugin_event_name
 381             = XRESIZEVEC (const char *, plugin_event_name, event_horizon);
 382           plugin_callbacks = XRESIZEVEC (struct callback_info *,
 383                                          plugin_callbacks, event_horizon);
 384         }
 385       /* All the pointers in the hash table will need to be updated.  */
 386       delete event_tab;
 387       event_tab = NULL;
 388     }
 389   else
 390     *slot = &plugin_event_name[event_last];
 391   plugin_event_name[event_last] = name;
 392   return event_last++;
 393 }
 394
 395 /* Called from the plugin's initialization code. Register a single callback.
 396    This function can be called multiple times.
 397
 398    PLUGIN_NAME - display name for this plugin
 399    EVENT       - which event the callback is for
 400    CALLBACK    - the callback to be called at the event
 401    USER_DATA   - plugin-provided data   */
 402
 403 void
 404 register_callback (const char *plugin_name,
 405                    int event,
 406                    plugin_callback_func callback,
 407                    void *user_data)
 408 {
 409   switch (event)
 410     {
 411       case PLUGIN_PASS_MANAGER_SETUP:
 412         gcc_assert (!callback);
 413         register_pass ((struct register_pass_info *) user_data);
 414         break;
 415       case PLUGIN_INFO:
 416         gcc_assert (!callback);
 417         register_plugin_info (plugin_name, (struct plugin_info *) user_data);
 418         break;
 419       case PLUGIN_REGISTER_GGC_ROOTS:
 420         gcc_assert (!callback);
 421         ggc_register_root_tab ((const struct ggc_root_tab*) user_data);
 422         break;
 423       case PLUGIN_REGISTER_GGC_CACHES:
 424         gcc_assert (!callback);
 425         ggc_register_cache_tab ((const struct ggc_cache_tab*) user_data);
 426         break;
 427       case PLUGIN_EVENT_FIRST_DYNAMIC:
 428       default:
 429         if (event < PLUGIN_EVENT_FIRST_DYNAMIC || event >= event_last)
 430           {
 431             error ("unknown callback event registered by plugin %s",
 432                    plugin_name);
 433             return;
 434           }
 435       /* Fall through.  */
 436       case PLUGIN_FINISH_TYPE:
 437       case PLUGIN_FINISH_DECL:
 438       case PLUGIN_START_UNIT:
 439       case PLUGIN_FINISH_UNIT:
 440       case PLUGIN_PRE_GENERICIZE:
 441       case PLUGIN_GGC_START:
 442       case PLUGIN_GGC_MARKING:
 443       case PLUGIN_GGC_END:
 444       case PLUGIN_ATTRIBUTES:
 445       case PLUGIN_PRAGMAS:
 446       case PLUGIN_FINISH:
 447       case PLUGIN_ALL_PASSES_START:
 448       case PLUGIN_ALL_PASSES_END:
 449       case PLUGIN_ALL_IPA_PASSES_START:
 450       case PLUGIN_ALL_IPA_PASSES_END:
 451       case PLUGIN_OVERRIDE_GATE:
 452       case PLUGIN_PASS_EXECUTION:
 453       case PLUGIN_EARLY_GIMPLE_PASSES_START:
 454       case PLUGIN_EARLY_GIMPLE_PASSES_END:
 455       case PLUGIN_NEW_PASS:
 456       case PLUGIN_INCLUDE_FILE:
 457         {
 458           struct callback_info *new_callback;
 459           if (!callback)
 460             {
 461               error ("plugin %s registered a null callback function "
 462                      "for event %s", plugin_name, plugin_event_name[event]);
 463               return;
 464             }
 465           new_callback = XNEW (struct callback_info);
 466           new_callback->plugin_name = plugin_name;
 467           new_callback->func = callback;
 468           new_callback->user_data = user_data;
 469           new_callback->next = plugin_callbacks[event];
 470           plugin_callbacks[event] = new_callback;
 471         }
 472         break;
 473     }
 474 }
 475
 476 /* Remove a callback for EVENT which has been registered with for a plugin
 477    PLUGIN_NAME.  Return PLUGEVT_SUCCESS if a matching callback was
 478    found & removed, PLUGEVT_NO_CALLBACK if the event does not have a matching
 479    callback, and PLUGEVT_NO_SUCH_EVENT if EVENT is invalid.  */
 480 int
 481 unregister_callback (const char *plugin_name, int event)
 482 {
 483   struct callback_info *callback, **cbp;
 484
 485   if (event >= event_last)
 486     return PLUGEVT_NO_SUCH_EVENT;
 487
 488   for (cbp = &plugin_callbacks[event]; (callback = *cbp); cbp = &callback->next)
 489     if (strcmp (callback->plugin_name, plugin_name) == 0)
 490       {
 491         *cbp = callback->next;
 492         return PLUGEVT_SUCCESS;
 493       }
 494   return PLUGEVT_NO_CALLBACK;
 495 }
 496
 497 /* Invoke all plugin callbacks registered with the specified event,
 498    called from invoke_plugin_callbacks().  */
 499
 500 int
 501 invoke_plugin_callbacks_full (int event, void *gcc_data)
 502 {
 503   int retval = PLUGEVT_SUCCESS;
 504
 505   timevar_push (TV_PLUGIN_RUN);
 506
 507   switch (event)
 508     {
 509       case PLUGIN_EVENT_FIRST_DYNAMIC:
 510       default:
 511         gcc_assert (event >= PLUGIN_EVENT_FIRST_DYNAMIC);
 512         gcc_assert (event < event_last);
 513       /* Fall through.  */
 514       case PLUGIN_FINISH_TYPE:
 515       case PLUGIN_FINISH_DECL:
 516       case PLUGIN_START_UNIT:
 517       case PLUGIN_FINISH_UNIT:
 518       case PLUGIN_PRE_GENERICIZE:
 519       case PLUGIN_ATTRIBUTES:
 520       case PLUGIN_PRAGMAS:
 521       case PLUGIN_FINISH:
 522       case PLUGIN_GGC_START:
 523       case PLUGIN_GGC_MARKING:
 524       case PLUGIN_GGC_END:
 525       case PLUGIN_ALL_PASSES_START:
 526       case PLUGIN_ALL_PASSES_END:
 527       case PLUGIN_ALL_IPA_PASSES_START:
 528       case PLUGIN_ALL_IPA_PASSES_END:
 529       case PLUGIN_OVERRIDE_GATE:
 530       case PLUGIN_PASS_EXECUTION:
 531       case PLUGIN_EARLY_GIMPLE_PASSES_START:
 532       case PLUGIN_EARLY_GIMPLE_PASSES_END:
 533       case PLUGIN_NEW_PASS:
 534       case PLUGIN_INCLUDE_FILE:
 535         {
 536           /* Iterate over every callback registered with this event and
 537              call it.  */
 538           struct callback_info *callback = plugin_callbacks[event];
 539
 540           if (!callback)
 541             retval = PLUGEVT_NO_CALLBACK;
 542           for ( ; callback; callback = callback->next)
 543             (*callback->func) (gcc_data, callback->user_data);
 544         }
 545         break;
 546
 547       case PLUGIN_PASS_MANAGER_SETUP:
 548       case PLUGIN_REGISTER_GGC_ROOTS:
 549       case PLUGIN_REGISTER_GGC_CACHES:
 550         gcc_assert (false);
 551     }
 552
 553   timevar_pop (TV_PLUGIN_RUN);
 554   return retval;
 555 }
 556
 557 #ifdef ENABLE_PLUGIN
 558 /* We need a union to cast dlsym return value to a function pointer
 559    as ISO C forbids assignment between function pointer and 'void *'.
 560    Use explicit union instead of __extension__(<union_cast>) for
 561    portability.  */
 562 #define PTR_UNION_TYPE(TOTYPE) union { void *_q; TOTYPE _nq; }
 563 #define PTR_UNION_AS_VOID_PTR(NAME) (NAME._q)
 564 #define PTR_UNION_AS_CAST_PTR(NAME) (NAME._nq)
 565
 566 /* Try to initialize PLUGIN. Return true if successful. */
 567
 568 static bool
 569 try_init_one_plugin (struct plugin_name_args *plugin)
 570 {
 571   void *dl_handle;
 572   plugin_init_func plugin_init;
 573   const char *err;
 574   PTR_UNION_TYPE (plugin_init_func) plugin_init_union;
 575
 576   /* We use RTLD_NOW to accelerate binding and detect any mismatch
 577      between the API expected by the plugin and the GCC API; we use
 578      RTLD_GLOBAL which is useful to plugins which themselves call
 579      dlopen.  */
 580   dl_handle = dlopen (plugin->full_name, RTLD_NOW | RTLD_GLOBAL);
 581   if (!dl_handle)
 582     {
 583       error ("cannot load plugin %s\n%s", plugin->full_name, dlerror ());
 584       return false;
 585     }
 586
 587   /* Clear any existing error.  */
 588   dlerror ();
 589
 590   /* Check the plugin license.  */
 591   if (dlsym (dl_handle, str_license) == NULL)
 592     fatal_error ("plugin %s is not licensed under a GPL-compatible license\n"
 593                  "%s", plugin->full_name, dlerror ());
 594
 595   PTR_UNION_AS_VOID_PTR (plugin_init_union) =
 596       dlsym (dl_handle, str_plugin_init_func_name);
 597   plugin_init = PTR_UNION_AS_CAST_PTR (plugin_init_union);
 598
 599   if ((err = dlerror ()) != NULL)
 600     {
 601       error ("cannot find %s in plugin %s\n%s", str_plugin_init_func_name,
 602              plugin->full_name, err);
 603       return false;
 604     }
 605
 606   /* Call the plugin-provided initialization routine with the arguments.  */
 607   if ((*plugin_init) (plugin, &gcc_version))
 608     {
 609       error ("fail to initialize plugin %s", plugin->full_name);
 610       return false;
 611     }
 612
 613   return true;
 614 }
 615
 616
 617 /* Routine to dlopen and initialize one plugin. This function is passed to
 618    (and called by) the hash table traverse routine. Return 1 for the
 619    htab_traverse to continue scan, 0 to stop.
 620
 621    SLOT - slot of the hash table element
 622    INFO - auxiliary pointer handed to hash table traverse routine
 623           (unused in this function)  */
 624
 625 static int
 626 init_one_plugin (void **slot, void * ARG_UNUSED (info))
 627 {
 628   struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
 629   bool ok = try_init_one_plugin (plugin);
 630   if (!ok)
 631     {
 632       htab_remove_elt (plugin_name_args_tab, plugin->base_name);
 633       XDELETE (plugin);
 634     }
 635   return 1;
 636 }
 637
 638 #endif  /* ENABLE_PLUGIN  */
 639
 640 /* Main plugin initialization function.  Called from compile_file() in
 641    toplev.c.  */
 642
 643 void
 644 initialize_plugins (void)
 645 {
 646   /* If no plugin was specified in the command-line, simply return.  */
 647   if (!plugin_name_args_tab)
 648     return;
 649
 650   timevar_push (TV_PLUGIN_INIT);
 651
 652 #ifdef ENABLE_PLUGIN
 653   /* Traverse and initialize each plugin specified in the command-line.  */
 654   htab_traverse_noresize (plugin_name_args_tab, init_one_plugin, NULL);
 655 #endif
 656
 657   timevar_pop (TV_PLUGIN_INIT);
 658 }
 659
 660 /* Release memory used by one plugin. */
 661
 662 static int
 663 finalize_one_plugin (void **slot, void * ARG_UNUSED (info))
 664 {
 665   struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
 666   XDELETE (plugin);
 667   return 1;
 668 }
 669
 670 /* Free memory allocated by the plugin system. */
 671
 672 void
 673 finalize_plugins (void)
 674 {
 675   if (!plugin_name_args_tab)
 676     return;
 677
 678   /* We can now delete the plugin_name_args object as it will no longer
 679      be used. Note that base_name and argv fields (both of which were also
 680      dynamically allocated) are not freed as they could still be used by
 681      the plugin code.  */
 682
 683   htab_traverse_noresize (plugin_name_args_tab, finalize_one_plugin, NULL);
 684
 685   /* PLUGIN_NAME_ARGS_TAB is no longer needed, just delete it.  */
 686   htab_delete (plugin_name_args_tab);
 687   plugin_name_args_tab = NULL;
 688 }
 689
 690 /* Used to pass options to htab_traverse callbacks. */
 691
 692 struct print_options
 693 {
 694   FILE *file;
 695   const char *indent;
 696 };
 697
 698 /* Print the version of one plugin. */
 699
 700 static int
 701 print_version_one_plugin (void **slot, void *data)
 702 {
 703   struct print_options *opt = (struct print_options *) data;
 704   struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
 705   const char *version = plugin->version ? plugin->version : "Unknown version.";
 706
 707   fprintf (opt->file, " %s%s: %s\n", opt->indent, plugin->base_name, version);
 708   return 1;
 709 }
 710
 711 /* Print the version of each plugin. */
 712
 713 void
 714 print_plugins_versions (FILE *file, const char *indent)
 715 {
 716   struct print_options opt;
 717   opt.file = file;
 718   opt.indent = indent;
 719   if (!plugin_name_args_tab || htab_elements (plugin_name_args_tab) == 0)
 720     return;
 721
 722   fprintf (file, "%sVersions of loaded plugins:\n", indent);
 723   htab_traverse_noresize (plugin_name_args_tab, print_version_one_plugin, &opt);
 724 }
 725
 726 /* Print help for one plugin. SLOT is the hash table slot. DATA is the
 727    argument to htab_traverse_noresize. */
 728
 729 static int
 730 print_help_one_plugin (void **slot, void *data)
 731 {
 732   struct print_options *opt = (struct print_options *) data;
 733   struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
 734   const char *help = plugin->help ? plugin->help : "No help available .";
 735
 736   char *dup = xstrdup (help);
 737   char *p, *nl;
 738   fprintf (opt->file, " %s%s:\n", opt->indent, plugin->base_name);
 739
 740   for (p = nl = dup; nl; p = nl)
 741     {
 742       nl = strchr (nl, '\n');
 743       if (nl)
 744         {
 745           *nl = '\0';
 746           nl++;
 747         }
 748       fprintf (opt->file, "   %s %s\n", opt->indent, p);
 749     }
 750
 751   free (dup);
 752   return 1;
 753 }
 754
 755 /* Print help for each plugin. The output goes to FILE and every line starts
 756    with INDENT. */
 757
 758 void
 759 print_plugins_help (FILE *file, const char *indent)
 760 {
 761   struct print_options opt;
 762   opt.file = file;
 763   opt.indent = indent;
 764   if (!plugin_name_args_tab || htab_elements (plugin_name_args_tab) == 0)
 765     return;
 766
 767   fprintf (file, "%sHelp for the loaded plugins:\n", indent);
 768   htab_traverse_noresize (plugin_name_args_tab, print_help_one_plugin, &opt);
 769 }
 770
 771
 772 /* Return true if plugins have been loaded.  */
 773
 774 bool
 775 plugins_active_p (void)
 776 {
 777   int event;
 778
 779   for (event = PLUGIN_PASS_MANAGER_SETUP; event < event_last; event++)
 780     if (plugin_callbacks[event])
 781       return true;
 782
 783   return false;
 784 }
 785
 786
 787 /* Dump to FILE the names and associated events for all the active
 788    plugins.  */
 789
 790 DEBUG_FUNCTION void
 791 dump_active_plugins (FILE *file)
 792 {
 793   int event;
 794
 795   if (!plugins_active_p ())
 796     return;
 797
 798   fprintf (file, FMT_FOR_PLUGIN_EVENT " | %s\n", _("Event"), _("Plugins"));
 799   for (event = PLUGIN_PASS_MANAGER_SETUP; event < event_last; event++)
 800     if (plugin_callbacks[event])
 801       {
 802         struct callback_info *ci;
 803
 804         fprintf (file, FMT_FOR_PLUGIN_EVENT " |", plugin_event_name[event]);
 805
 806         for (ci = plugin_callbacks[event]; ci; ci = ci->next)
 807           fprintf (file, " %s", ci->plugin_name);
 808
 809         putc ('\n', file);
 810       }
 811 }
 812
 813
 814 /* Dump active plugins to stderr.  */
 815
 816 DEBUG_FUNCTION void
 817 debug_active_plugins (void)
 818 {
 819   dump_active_plugins (stderr);
 820 }
 821
 822 /* Give a warning if plugins are present, before an ICE message asking
 823    to submit a bug report.  */
 824
 825 void
 826 warn_if_plugins (void)
 827 {
 828   if (plugins_active_p ())
 829     {
 830       fnotice (stderr, "*** WARNING *** there are active plugins, do not report"
 831                " this as a bug unless you can reproduce it without enabling"
 832                " any plugins.\n");
 833       dump_active_plugins (stderr);
 834     }
 835
 836 }
 837
 838 /* Likewise, as a callback from the diagnostics code.  */
 839
 840 void
 841 plugins_internal_error_function (diagnostic_context *context ATTRIBUTE_UNUSED,
 842                                  const char *msgid ATTRIBUTE_UNUSED,
 843                                  va_list *ap ATTRIBUTE_UNUSED)
 844 {
 845   warn_if_plugins ();
 846 }
 847
 848 /* The default version check. Compares every field in VERSION. */
 849
 850 bool
 851 plugin_default_version_check (struct plugin_gcc_version *gcc_version,
 852                               struct plugin_gcc_version *plugin_version)
 853 {
 854   if (!gcc_version || !plugin_version)
 855     return false;
 856
 857   if (strcmp (gcc_version->basever, plugin_version->basever))
 858     return false;
 859   if (strcmp (gcc_version->datestamp, plugin_version->datestamp))
 860     return false;
 861   if (strcmp (gcc_version->devphase, plugin_version->devphase))
 862     return false;
 863   if (strcmp (gcc_version->revision, plugin_version->revision))
 864     return false;
 865   if (strcmp (gcc_version->configuration_arguments,
 866               plugin_version->configuration_arguments))
 867     return false;
 868   return true;
 869 }
 870
 871
 872 /* Return the current value of event_last, so that plugins which provide
 873    additional functionality for events for the benefit of high-level plugins
 874    know how many valid entries plugin_event_name holds.  */
 875
 876 int
 877 get_event_last (void)
 878 {
 879   return event_last;
 880 }
 881
 882
 883 /* Retrieve the default plugin directory.  The gcc driver should have passed
 884    it as -iplugindir <dir> to the cc1 program, and it is queriable through the
 885    -print-file-name=plugin option to gcc.  */
 886 const char*
 887 default_plugin_dir_name (void)
 888 {
 889   if (!plugindir_string)
 890     fatal_error ("-iplugindir <dir> option not passed from the gcc driver");
 891   return plugindir_string;
 892 }