1 /* Support for GCC plugin mechanism.
2 Copyright (C) 2009 Free Software Foundation, Inc.
4 This file is part of GCC.
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)
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.
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/>. */
20 /* This file contains the support for GCC plugin mechanism based on the
21 APIs described in doc/plugin.texi. */
26 /* If plugin support is not enabled, do not try to execute any code
27 that may reference libdl. The generic code is still compiled in to
28 avoid including to many conditional compilation paths in the rest
34 #include "coretypes.h"
37 #include "tree-pass.h"
42 #include "plugin-version.h"
45 /* Event names as strings. Keep in sync with enum plugin_event. */
46 const char *plugin_event_name[] =
48 "PLUGIN_PASS_MANAGER_SETUP",
51 "PLUGIN_CXX_CP_PRE_GENERICIZE",
57 /* Hash table for the plugin_name_args objects created during command-line
59 static htab_t plugin_name_args_tab = NULL;
61 /* List node for keeping track of plugin-registered callback. */
64 const char *plugin_name; /* Name of plugin that registers the callback. */
65 plugin_callback_func func; /* Callback to be called. */
66 void *user_data; /* plugin-specified data. */
67 struct callback_info *next;
70 /* An array of lists of 'callback_info' objects indexed by the event id. */
71 static struct callback_info *plugin_callbacks[PLUGIN_EVENT_LAST] = { NULL };
73 /* List node for an inserted pass instance. We need to keep track of all
74 the newly-added pass instances (with 'added_pass_nodes' defined below)
75 so that we can register their dump files after pass-positioning is finished.
76 Registering dumping files needs to be post-processed or the
77 static_pass_number of the opt_pass object would be modified and mess up
78 the dump file names of future pass instances to be added. */
81 struct opt_pass *pass;
82 struct pass_list_node *next;
85 static struct pass_list_node *added_pass_nodes = NULL;
86 static struct pass_list_node *prev_added_pass_node;
89 /* Each plugin should define an initialization function with exactly
91 static const char *str_plugin_init_func_name = "plugin_init";
94 /* Helper function for the hash table that compares the base_name of the
95 existing entry (S1) with the given string (S2). */
98 htab_str_eq (const void *s1, const void *s2)
100 const struct plugin_name_args *plugin = (const struct plugin_name_args *) s1;
101 return !strcmp (plugin->base_name, (const char *) s2);
105 /* Given a plugin's full-path name FULL_NAME, e.g. /pass/to/NAME.so,
109 get_plugin_base_name (const char *full_name)
111 /* First get the base name part of the full-path name, i.e. NAME.so. */
112 char *base_name = xstrdup (lbasename (full_name));
114 /* Then get rid of '.so' part of the name. */
115 strip_off_ending (base_name, strlen (base_name));
121 /* Create a plugin_name_args object for the give plugin and insert it to
122 the hash table. This function is called when -fplugin=/path/to/NAME.so
123 option is processed. */
126 add_new_plugin (const char* plugin_name)
128 struct plugin_name_args *plugin;
130 char *base_name = get_plugin_base_name (plugin_name);
132 /* If this is the first -fplugin= option we encounter, create
133 'plugin_name_args_tab' hash table. */
134 if (!plugin_name_args_tab)
135 plugin_name_args_tab = htab_create (10, htab_hash_string, htab_str_eq,
138 slot = htab_find_slot (plugin_name_args_tab, base_name, INSERT);
140 /* If the same plugin (name) has been specified earlier, either emit an
141 error or a warning message depending on if they have identical full
145 plugin = (struct plugin_name_args *) *slot;
146 if (strcmp (plugin->full_name, plugin_name))
147 error ("Plugin %s was specified with different paths:\n%s\n%s",
148 plugin->base_name, plugin->full_name, plugin_name);
152 plugin = XCNEW (struct plugin_name_args);
153 plugin->base_name = base_name;
154 plugin->full_name = plugin_name;
160 /* Parse the -fplugin-arg-<name>-<key>[=<value>] option and create a
161 'plugin_argument' object for the parsed key-value pair. ARG is
162 the <name>-<key>[=<value>] part of the option. */
165 parse_plugin_arg_opt (const char *arg)
167 size_t len = 0, name_len = 0, key_len = 0, value_len = 0;
168 const char *ptr, *name_start = arg, *key_start = NULL, *value_start = NULL;
169 char *name, *key, *value;
171 bool name_parsed = false, key_parsed = false;
173 /* Iterate over the ARG string and identify the starting character position
174 of 'name', 'key', and 'value' and their lengths. */
175 for (ptr = arg; *ptr; ++ptr)
177 /* Only the first '-' encountered is considered a separator between
178 'name' and 'key'. All the subsequent '-'s are considered part of
179 'key'. For example, given -fplugin-arg-foo-bar-primary-key=value,
180 the plugin name is 'foo' and the key is 'bar-primary-key'. */
181 if (*ptr == '-' && !name_parsed)
189 else if (*ptr == '=')
193 error ("Malformed option -fplugin-arg-%s (multiple '=' signs)",
199 value_start = ptr + 1;
209 error ("Malformed option -fplugin-arg-%s (missing -<key>[=<value>])",
214 /* If the option doesn't contain the 'value' part, LEN is the KEY_LEN.
215 Otherwise, it is the VALUE_LEN. */
221 name = XNEWVEC (char, name_len + 1);
222 strncpy (name, name_start, name_len);
223 name[name_len] = '\0';
225 /* Check if the named plugin has already been specified earlier in the
227 if (plugin_name_args_tab
228 && ((slot = htab_find_slot (plugin_name_args_tab, name, NO_INSERT))
231 struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
233 key = XNEWVEC (char, key_len + 1);
234 strncpy (key, key_start, key_len);
238 value = XNEWVEC (char, value_len + 1);
239 strncpy (value, value_start, value_len);
240 value[value_len] = '\0';
245 /* Create a plugin_argument object for the parsed key-value pair.
246 If there are already arguments for this plugin, we will need to
247 adjust the argument array size by creating a new array and deleting
248 the old one. If the performance ever becomes an issue, we can
249 change the code by pre-allocating a larger array first. */
250 if (plugin->argc > 0)
252 struct plugin_argument *args = XNEWVEC (struct plugin_argument,
254 memcpy (args, plugin->argv,
255 sizeof (struct plugin_argument) * plugin->argc);
256 XDELETEVEC (plugin->argv);
262 gcc_assert (plugin->argv == NULL);
263 plugin->argv = XNEWVEC (struct plugin_argument, 1);
267 plugin->argv[plugin->argc - 1].key = key;
268 plugin->argv[plugin->argc - 1].value = value;
271 error ("Plugin %s should be specified before -fplugin-arg-%s "
272 "in the command line", name, arg);
274 /* We don't need the plugin's name anymore. Just release it. */
279 /* Insert the plugin pass at the proper position. Return true if the pass
280 is successfully added.
282 PLUGIN_PASS_INFO - new pass to be inserted
283 PASS_LIST - root of the pass list to insert the new pass to */
286 position_pass (struct plugin_pass *plugin_pass_info,
287 struct opt_pass **pass_list)
289 struct opt_pass *pass = *pass_list, *prev_pass = NULL;
290 bool success = false;
292 for ( ; pass; prev_pass = pass, pass = pass->next)
294 /* Check if the current pass is of the same type as the new pass and
295 matches the name and the instance number of the reference pass. */
296 if (pass->type == plugin_pass_info->pass->type
298 && !strcmp (pass->name, plugin_pass_info->reference_pass_name)
299 && ((plugin_pass_info->ref_pass_instance_number == 0)
300 || (plugin_pass_info->ref_pass_instance_number ==
301 pass->static_pass_number)
302 || (plugin_pass_info->ref_pass_instance_number == 1
303 && pass->todo_flags_start & TODO_mark_first_instance)))
305 struct opt_pass *new_pass = plugin_pass_info->pass;
306 struct pass_list_node *new_pass_node;
308 /* The following code (if-statement) is adopted from next_pass_1. */
309 if (new_pass->static_pass_number)
311 new_pass = XNEW (struct opt_pass);
312 memcpy (new_pass, plugin_pass_info->pass, sizeof (*new_pass));
313 new_pass->next = NULL;
315 new_pass->todo_flags_start &= ~TODO_mark_first_instance;
317 plugin_pass_info->pass->static_pass_number -= 1;
318 new_pass->static_pass_number =
319 -plugin_pass_info->pass->static_pass_number;
323 new_pass->todo_flags_start |= TODO_mark_first_instance;
324 new_pass->static_pass_number = -1;
327 /* Insert the new pass instance based on the positioning op. */
328 switch (plugin_pass_info->pos_op)
330 case PASS_POS_INSERT_AFTER:
331 new_pass->next = pass->next;
332 pass->next = new_pass;
334 case PASS_POS_INSERT_BEFORE:
335 new_pass->next = pass;
337 prev_pass->next = new_pass;
339 *pass_list = new_pass;
341 case PASS_POS_REPLACE:
342 new_pass->next = pass->next;
344 prev_pass->next = new_pass;
346 *pass_list = new_pass;
347 new_pass->sub = pass->sub;
348 new_pass->tv_id = pass->tv_id;
352 error ("Invalid pass positioning operation");
356 /* Save the newly added pass (instance) in the added_pass_nodes
357 list so that we can register its dump file later. Note that
358 we cannot register the dump file now because doing so will modify
359 the static_pass_number of the opt_pass object and therefore
360 mess up the dump file name of future instances. */
361 new_pass_node = XCNEW (struct pass_list_node);
362 new_pass_node->pass = new_pass;
363 if (!added_pass_nodes)
364 added_pass_nodes = new_pass_node;
366 prev_added_pass_node->next = new_pass_node;
367 prev_added_pass_node = new_pass_node;
372 if (pass->sub && position_pass (plugin_pass_info, &pass->sub))
380 /* Hook into the pass lists (trees) a new pass registered by a plugin.
382 PLUGIN_NAME - display name for the plugin
383 PASS_INFO - plugin pass information that specifies the opt_pass object,
384 reference pass, instance number, and how to position
388 register_pass (const char *plugin_name, struct plugin_pass *pass_info)
390 if (!pass_info->pass)
392 error ("No pass specified when registering a new pass in plugin %s",
397 if (!pass_info->reference_pass_name)
399 error ("No reference pass specified for positioning the pass "
400 " from plugin %s", plugin_name);
404 /* Try to insert the new pass to the pass lists. We need to check all
405 three lists as the reference pass could be in one (or all) of them. */
406 if (!position_pass (pass_info, &all_lowering_passes)
407 && !position_pass (pass_info, &all_ipa_passes)
408 && !position_pass (pass_info, &all_passes))
409 error ("Failed to position pass %s registered by plugin %s. "
410 "Cannot find the (specified instance of) reference pass %s",
411 pass_info->pass->name, plugin_name, pass_info->reference_pass_name);
414 /* OK, we have successfully inserted the new pass. We need to register
415 the dump files for the newly added pass and its duplicates (if any).
416 Because the registration of plugin passes happens after the
417 command-line options are parsed, the options that specify single
418 pass dumping (e.g. -fdump-tree-PASSNAME) cannot be used for new
419 plugin passes. Therefore we currently can only enable dumping of
420 new plugin passes when the 'dump-all' flags (e.g. -fdump-tree-all)
421 are specified. While doing so, we also delete the pass_list_node
422 objects created during pass positioning. */
423 while (added_pass_nodes)
425 struct pass_list_node *next_node = added_pass_nodes->next;
426 enum tree_dump_index tdi;
427 register_one_dump_file (added_pass_nodes->pass);
428 if (added_pass_nodes->pass->type == SIMPLE_IPA_PASS
429 || added_pass_nodes->pass->type == IPA_PASS)
431 else if (added_pass_nodes->pass->type == GIMPLE_PASS)
435 /* Check if dump-all flag is specified. */
436 if (get_dump_file_info (tdi)->state)
437 get_dump_file_info (added_pass_nodes->pass->static_pass_number)
438 ->state = get_dump_file_info (tdi)->state;
439 XDELETE (added_pass_nodes);
440 added_pass_nodes = next_node;
446 /* Register additional plugin information. NAME is the name passed to
447 plugin_init. INFO is the information that should be registered. */
450 register_plugin_info (const char* name, struct plugin_info *info)
452 void **slot = htab_find_slot (plugin_name_args_tab, name, NO_INSERT);
453 struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
454 plugin->version = info->version;
455 plugin->help = info->help;
458 /* Called from the plugin's initialization code. Register a single callback.
459 This function can be called multiple times.
461 PLUGIN_NAME - display name for this plugin
462 EVENT - which event the callback is for
463 CALLBACK - the callback to be called at the event
464 USER_DATA - plugin-provided data */
467 register_callback (const char *plugin_name,
468 enum plugin_event event,
469 plugin_callback_func callback,
474 case PLUGIN_PASS_MANAGER_SETUP:
475 register_pass (plugin_name, (struct plugin_pass *) user_data);
478 register_plugin_info (plugin_name, (struct plugin_info *) user_data);
480 case PLUGIN_FINISH_TYPE:
481 case PLUGIN_FINISH_UNIT:
482 case PLUGIN_CXX_CP_PRE_GENERICIZE:
483 case PLUGIN_ATTRIBUTES:
486 struct callback_info *new_callback;
489 error ("Plugin %s registered a null callback function "
490 "for event %s", plugin_name, plugin_event_name[event]);
493 new_callback = XNEW (struct callback_info);
494 new_callback->plugin_name = plugin_name;
495 new_callback->func = callback;
496 new_callback->user_data = user_data;
497 new_callback->next = plugin_callbacks[event];
498 plugin_callbacks[event] = new_callback;
501 case PLUGIN_EVENT_LAST:
503 error ("Unkown callback event registered by plugin %s",
509 /* Called from inside GCC. Invoke all plug-in callbacks registered with
512 EVENT - the event identifier
513 GCC_DATA - event-specific data provided by the compiler */
516 invoke_plugin_callbacks (enum plugin_event event, void *gcc_data)
518 timevar_push (TV_PLUGIN_RUN);
522 case PLUGIN_FINISH_TYPE:
523 case PLUGIN_FINISH_UNIT:
524 case PLUGIN_CXX_CP_PRE_GENERICIZE:
525 case PLUGIN_ATTRIBUTES:
528 /* Iterate over every callback registered with this event and
530 struct callback_info *callback = plugin_callbacks[event];
531 for ( ; callback; callback = callback->next)
532 (*callback->func) (gcc_data, callback->user_data);
536 case PLUGIN_PASS_MANAGER_SETUP:
537 case PLUGIN_EVENT_LAST:
542 timevar_pop (TV_PLUGIN_RUN);
546 /* We need a union to cast dlsym return value to a function pointer
547 as ISO C forbids assignment between function pointer and 'void *'.
548 Use explicit union instead of __extension__(<union_cast>) for
550 #define PTR_UNION_TYPE(TOTYPE) union { void *_q; TOTYPE _nq; }
551 #define PTR_UNION_AS_VOID_PTR(NAME) (NAME._q)
552 #define PTR_UNION_AS_CAST_PTR(NAME) (NAME._nq)
554 /* Try to initialize PLUGIN. Return true if successful. */
557 try_init_one_plugin (struct plugin_name_args *plugin)
560 plugin_init_func plugin_init;
562 PTR_UNION_TYPE (plugin_init_func) plugin_init_union;
564 dl_handle = dlopen (plugin->full_name, RTLD_NOW);
567 error ("Cannot load plugin %s\n%s", plugin->full_name, dlerror ());
571 /* Clear any existing error. */
574 PTR_UNION_AS_VOID_PTR (plugin_init_union) =
575 dlsym (dl_handle, str_plugin_init_func_name);
576 plugin_init = PTR_UNION_AS_CAST_PTR (plugin_init_union);
578 if ((err = dlerror ()) != NULL)
580 error ("Cannot find %s in plugin %s\n%s", str_plugin_init_func_name,
581 plugin->full_name, err);
585 /* Call the plugin-provided initialization routine with the arguments. */
586 if ((*plugin_init) (plugin, &gcc_version))
588 error ("Fail to initialize plugin %s", plugin->full_name);
596 /* Routine to dlopen and initialize one plugin. This function is passed to
597 (and called by) the hash table traverse routine. Return 1 for the
598 htab_traverse to continue scan, 0 to stop.
600 SLOT - slot of the hash table element
601 INFO - auxiliary pointer handed to hash table traverse routine
602 (unused in this function) */
605 init_one_plugin (void **slot, void * ARG_UNUSED (info))
607 struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
608 bool ok = try_init_one_plugin (plugin);
611 htab_remove_elt (plugin_name_args_tab, plugin->base_name);
617 #endif /* ENABLE_PLUGIN */
619 /* Main plugin initialization function. Called from compile_file() in
623 initialize_plugins (void)
625 /* If no plugin was specified in the command-line, simply return. */
626 if (!plugin_name_args_tab)
629 timevar_push (TV_PLUGIN_INIT);
632 /* Traverse and initialize each plugin specified in the command-line. */
633 htab_traverse_noresize (plugin_name_args_tab, init_one_plugin, NULL);
636 timevar_pop (TV_PLUGIN_INIT);
639 /* Release memory used by one plugin. */
642 finalize_one_plugin (void **slot, void * ARG_UNUSED (info))
644 struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
649 /* Free memory allocated by the plugin system. */
652 finalize_plugins (void)
654 if (!plugin_name_args_tab)
657 /* We can now delete the plugin_name_args object as it will no longer
658 be used. Note that base_name and argv fields (both of which were also
659 dynamically allocated) are not freed as they could still be used by
662 htab_traverse_noresize (plugin_name_args_tab, finalize_one_plugin, NULL);
664 /* PLUGIN_NAME_ARGS_TAB is no longer needed, just delete it. */
665 htab_delete (plugin_name_args_tab);
666 plugin_name_args_tab = NULL;
669 /* Used to pass options to htab_traverse callbacks. */
677 /* Print the version of one plugin. */
680 print_version_one_plugin (void **slot, void *data)
682 struct print_options *opt = (struct print_options *) data;
683 struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
684 const char *version = plugin->version ? plugin->version : "Unknown version.";
686 fprintf (opt->file, " %s%s: %s\n", opt->indent, plugin->base_name, version);
690 /* Print the version of each plugin. */
693 print_plugins_versions (FILE *file, const char *indent)
695 struct print_options opt;
698 if (!plugin_name_args_tab || htab_elements (plugin_name_args_tab) == 0)
701 fprintf (file, "%sVersions of loaded plugins:\n", indent);
702 htab_traverse_noresize (plugin_name_args_tab, print_version_one_plugin, &opt);
705 /* Print help for one plugin. SLOT is the hash table slot. DATA is the
706 argument to htab_traverse_noresize. */
709 print_help_one_plugin (void **slot, void *data)
711 struct print_options *opt = (struct print_options *) data;
712 struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
713 const char *help = plugin->help ? plugin->help : "No help available .";
715 char *dup = xstrdup (help);
717 fprintf (opt->file, " %s%s:\n", opt->indent, plugin->base_name);
719 for (p = nl = dup; nl; p = nl)
721 nl = strchr (nl, '\n');
727 fprintf (opt->file, " %s %s\n", opt->indent, p);
734 /* Print help for each plugin. The output goes to FILE and every line starts
738 print_plugins_help (FILE *file, const char *indent)
740 struct print_options opt;
743 if (!plugin_name_args_tab || htab_elements (plugin_name_args_tab) == 0)
746 fprintf (file, "%sHelp for the loaded plugins:\n", indent);
747 htab_traverse_noresize (plugin_name_args_tab, print_help_one_plugin, &opt);
751 /* Return true if plugins have been loaded. */
754 plugins_active_p (void)
758 for (event = PLUGIN_PASS_MANAGER_SETUP; event < PLUGIN_EVENT_LAST; event++)
759 if (plugin_callbacks[event])
766 /* Dump to FILE the names and associated events for all the active
770 dump_active_plugins (FILE *file)
774 if (!plugins_active_p ())
777 fprintf (stderr, "Event\t\t\tPlugins\n");
778 for (event = PLUGIN_PASS_MANAGER_SETUP; event < PLUGIN_EVENT_LAST; event++)
779 if (plugin_callbacks[event])
781 struct callback_info *ci;
783 fprintf (file, "%s\t", plugin_event_name[event]);
785 for (ci = plugin_callbacks[event]; ci; ci = ci->next)
786 fprintf (file, "%s ", ci->plugin_name);
788 fprintf (file, "\n");
793 /* Dump active plugins to stderr. */
796 debug_active_plugins (void)
798 dump_active_plugins (stderr);
801 /* The default version check. Compares every field in VERSION. */
804 plugin_default_version_check (struct plugin_gcc_version *gcc_version,
805 struct plugin_gcc_version *plugin_version)
807 if (!gcc_version || !plugin_version)
810 if (strcmp (gcc_version->basever, plugin_version->basever))
812 if (strcmp (gcc_version->datestamp, plugin_version->datestamp))
814 if (strcmp (gcc_version->devphase, plugin_version->devphase))
816 if (strcmp (gcc_version->revision, plugin_version->revision))
818 if (strcmp (gcc_version->configuration_arguments,
819 plugin_version->configuration_arguments))