commit gcc-4.4.3 which is used to build gcc-4.4.3 Android toolchain in master.

The source is based on fsf gcc-4.4.3 and contains local patches which
are recorded in gcc-4.4.3/README.google.

Change-Id: Id8c6d6927df274ae9749196a1cc24dbd9abc9887

1 files changed, 850 insertions, 0 deletions

diff --git a/gcc-4.4.3/gcc/plugin.c b/gcc-4.4.3/gcc/plugin.c
new file mode 100644
index 000000000..c692f3c1b
--- /dev/null
+++ b/gcc-4.4.3/gcc/plugin.c
@@ -0,0 +1,850 @@
+/* Support for GCC plugin mechanism.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* This file contains the support for GCC plugin mechanism based on the
+   APIs described in doc/plugin.texi.  */
+
+#include "config.h"
+#include "system.h"
+
+/* If plugin support is not enabled, do not try to execute any code
+   that may reference libdl.  The generic code is still compiled in to
+   avoid including to many conditional compilation paths in the rest
+   of the compiler.  */
+#ifdef ENABLE_PLUGIN
+#include <dlfcn.h>
+#endif
+
+#include "coretypes.h"
+#include "toplev.h"
+#include "tree.h"
+#include "tree-pass.h"
+#include "intl.h"
+#include "plugin.h"
+#include "timevar.h"
+#include "ggc.h"
+
+#ifdef ENABLE_PLUGIN
+#include "plugin-version.h"
+#endif
+
+/* Event names as strings.  Keep in sync with enum plugin_event.  */
+const char *plugin_event_name[] =
+{
+  "PLUGIN_PASS_MANAGER_SETUP",
+  "PLUGIN_FINISH_TYPE",
+  "PLUGIN_FINISH_UNIT",
+  "PLUGIN_CXX_CP_PRE_GENERICIZE",
+  "PLUGIN_FINISH",
+  "PLUGIN_INFO",
+  "PLUGIN_GGC_START",
+  "PLUGIN_GGC_MARKING",
+  "PLUGIN_GGC_END",
+  "PLUGIN_REGISTER_GGC_ROOTS",
+  "PLUGIN_START_UNIT", 
+  "PLUGIN_EVENT_LAST"
+};
+
+/* Hash table for the plugin_name_args objects created during command-line
+   parsing.  */
+static htab_t plugin_name_args_tab = NULL;
+
+/* List node for keeping track of plugin-registered callback.  */
+struct callback_info
+{
+  const char *plugin_name;   /* Name of plugin that registers the callback.  */
+  plugin_callback_func func; /* Callback to be called.  */
+  void *user_data;           /* plugin-specified data.  */
+  struct callback_info *next;
+};
+
+/* An array of lists of 'callback_info' objects indexed by the event id.  */
+static struct callback_info *plugin_callbacks[PLUGIN_EVENT_LAST] = { NULL };
+
+/* List node for an inserted pass instance. We need to keep track of all
+   the newly-added pass instances (with 'added_pass_nodes' defined below)
+   so that we can register their dump files after pass-positioning is finished.
+   Registering dumping files needs to be post-processed or the
+   static_pass_number of the opt_pass object would be modified and mess up
+   the dump file names of future pass instances to be added.  */
+struct pass_list_node
+{
+  struct opt_pass *pass;
+  struct pass_list_node *next;
+};
+
+static struct pass_list_node *added_pass_nodes = NULL;
+static struct pass_list_node *prev_added_pass_node;
+
+#ifdef ENABLE_PLUGIN
+/* Each plugin should define an initialization function with exactly
+   this name.  */
+static const char *str_plugin_init_func_name = "plugin_init";
+#endif
+
+/* Helper function for the hash table that compares the base_name of the
+   existing entry (S1) with the given string (S2).  */
+
+static int
+htab_str_eq (const void *s1, const void *s2)
+{
+  const struct plugin_name_args *plugin = (const struct plugin_name_args *) s1;
+  return !strcmp (plugin->base_name, (const char *) s2);
+}
+
+
+/* Given a plugin's full-path name FULL_NAME, e.g. /pass/to/NAME.so,
+   return NAME.  */
+
+static char *
+get_plugin_base_name (const char *full_name)
+{
+  /* First get the base name part of the full-path name, i.e. NAME.so.  */
+  char *base_name = xstrdup (lbasename (full_name));
+
+  /* Then get rid of '.so' part of the name.  */
+  strip_off_ending (base_name, strlen (base_name));
+
+  return base_name;
+}
+
+
+/* Create a plugin_name_args object for the give plugin and insert it to
+   the hash table. This function is called when -fplugin=/path/to/NAME.so
+   option is processed.  */
+
+void
+add_new_plugin (const char* plugin_name)
+{
+  struct plugin_name_args *plugin;
+  void **slot;
+  char *base_name = get_plugin_base_name (plugin_name);
+
+  /* If this is the first -fplugin= option we encounter, create 
+     'plugin_name_args_tab' hash table.  */
+  if (!plugin_name_args_tab)
+    plugin_name_args_tab = htab_create (10, htab_hash_string, htab_str_eq,
+                                        NULL);
+
+  slot = htab_find_slot (plugin_name_args_tab, base_name, INSERT);
+
+  /* If the same plugin (name) has been specified earlier, either emit an
+     error or a warning message depending on if they have identical full
+     (path) names.  */
+  if (*slot)
+    {
+      plugin = (struct plugin_name_args *) *slot;
+      if (strcmp (plugin->full_name, plugin_name))
+        error ("Plugin %s was specified with different paths:\n%s\n%s",
+               plugin->base_name, plugin->full_name, plugin_name);
+      return;
+    }
+
+  plugin = XCNEW (struct plugin_name_args);
+  plugin->base_name = base_name;
+  plugin->full_name = plugin_name;
+
+  *slot = plugin;
+}
+
+
+/* Parse the -fplugin-arg-<name>-<key>[=<value>] option and create a
+   'plugin_argument' object for the parsed key-value pair. ARG is
+   the <name>-<key>[=<value>] part of the option.  */
+
+void
+parse_plugin_arg_opt (const char *arg)
+{
+  size_t len = 0, name_len = 0, key_len = 0, value_len = 0;
+  const char *ptr, *name_start = arg, *key_start = NULL, *value_start = NULL;
+  char *name, *key, *value;
+  void **slot;
+  bool name_parsed = false, key_parsed = false;
+
+  /* Iterate over the ARG string and identify the starting character position
+     of 'name', 'key', and 'value' and their lengths.  */
+  for (ptr = arg; *ptr; ++ptr)
+    {
+      /* Only the first '-' encountered is considered a separator between
+         'name' and 'key'. All the subsequent '-'s are considered part of
+         'key'. For example, given -fplugin-arg-foo-bar-primary-key=value,
+         the plugin name is 'foo' and the key is 'bar-primary-key'.  */
+      if (*ptr == '-' && !name_parsed)
+        {
+          name_len = len;
+          len = 0;
+          key_start = ptr + 1;
+          name_parsed = true;
+          continue;
+        }
+      else if (*ptr == '=')
+        {
+          if (key_parsed)
+            {
+              error ("Malformed option -fplugin-arg-%s (multiple '=' signs)",
+		     arg);
+              return;
+            }
+          key_len = len;
+          len = 0;
+          value_start = ptr + 1;
+          key_parsed = true;
+          continue;
+        }
+      else
+        ++len;
+    }
+
+  if (!key_start)
+    {
+      error ("Malformed option -fplugin-arg-%s (missing -<key>[=<value>])",
+             arg);
+      return;
+    }
+
+  /* If the option doesn't contain the 'value' part, LEN is the KEY_LEN.
+     Otherwise, it is the VALUE_LEN.  */
+  if (!value_start)
+    key_len = len;
+  else
+    value_len = len;
+
+  name = XNEWVEC (char, name_len + 1);
+  strncpy (name, name_start, name_len);
+  name[name_len] = '\0';
+
+  /* Check if the named plugin has already been specified earlier in the
+     command-line.  */
+  if (plugin_name_args_tab
+      && ((slot = htab_find_slot (plugin_name_args_tab, name, NO_INSERT))
+          != NULL))
+    {
+      struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
+
+      key = XNEWVEC (char, key_len + 1);
+      strncpy (key, key_start, key_len);
+      key[key_len] = '\0';
+      if (value_start)
+        {
+          value = XNEWVEC (char, value_len + 1);
+          strncpy (value, value_start, value_len);
+          value[value_len] = '\0';
+        }
+      else
+        value = NULL;
+
+      /* Create a plugin_argument object for the parsed key-value pair.
+         If there are already arguments for this plugin, we will need to
+         adjust the argument array size by creating a new array and deleting
+         the old one. If the performance ever becomes an issue, we can
+         change the code by pre-allocating a larger array first.  */
+      if (plugin->argc > 0)
+        {
+          struct plugin_argument *args = XNEWVEC (struct plugin_argument,
+                                                  plugin->argc + 1);
+          memcpy (args, plugin->argv,
+                  sizeof (struct plugin_argument) * plugin->argc);
+          XDELETEVEC (plugin->argv);
+          plugin->argv = args;
+          ++plugin->argc;
+        }
+      else
+        {
+          gcc_assert (plugin->argv == NULL);
+          plugin->argv = XNEWVEC (struct plugin_argument, 1);
+          plugin->argc = 1;
+        }
+
+      plugin->argv[plugin->argc - 1].key = key;
+      plugin->argv[plugin->argc - 1].value = value;
+    }
+  else
+    error ("Plugin %s should be specified before -fplugin-arg-%s "
+           "in the command line", name, arg);
+
+  /* We don't need the plugin's name anymore. Just release it.  */
+  XDELETEVEC (name);
+}
+
+
+/* Insert the plugin pass at the proper position. Return true if the pass 
+   is successfully added.
+
+   PLUGIN_PASS_INFO - new pass to be inserted
+   PASS_LIST        - root of the pass list to insert the new pass to  */
+
+static bool
+position_pass (struct plugin_pass *plugin_pass_info,
+               struct opt_pass **pass_list)
+{
+  struct opt_pass *pass = *pass_list, *prev_pass = NULL;
+  bool success = false;
+
+  for ( ; pass; prev_pass = pass, pass = pass->next)
+    {
+      /* Check if the current pass is of the same type as the new pass and
+         matches the name and the instance number of the reference pass.  */
+      if (pass->type == plugin_pass_info->pass->type
+          && pass->name
+          && !strcmp (pass->name, plugin_pass_info->reference_pass_name)
+          && ((plugin_pass_info->ref_pass_instance_number == 0)
+              || (plugin_pass_info->ref_pass_instance_number ==
+                  pass->static_pass_number)
+              || (plugin_pass_info->ref_pass_instance_number == 1
+                  && pass->todo_flags_start & TODO_mark_first_instance)))
+        {
+          struct opt_pass *new_pass = plugin_pass_info->pass;
+          struct pass_list_node *new_pass_node;
+
+          /* The following code (if-statement) is adopted from next_pass_1.  */
+          if (new_pass->static_pass_number)
+            {
+              new_pass = XNEW (struct opt_pass);
+              memcpy (new_pass, plugin_pass_info->pass, sizeof (*new_pass));
+              new_pass->next = NULL;
+
+              new_pass->todo_flags_start &= ~TODO_mark_first_instance;
+
+              plugin_pass_info->pass->static_pass_number -= 1;
+              new_pass->static_pass_number =
+                  -plugin_pass_info->pass->static_pass_number;
+            }
+          else
+            {
+              new_pass->todo_flags_start |= TODO_mark_first_instance;
+              new_pass->static_pass_number = -1;
+            }
+
+          /* Insert the new pass instance based on the positioning op.  */
+          switch (plugin_pass_info->pos_op)
+            {
+              case PASS_POS_INSERT_AFTER:
+                new_pass->next = pass->next;
+                pass->next = new_pass;
+
+		/* Skip newly inserted pass to avoid repeated
+		   insertions in the case where the new pass and the
+		   existing one have the same name.  */
+                pass = new_pass; 
+                break;
+              case PASS_POS_INSERT_BEFORE:
+                new_pass->next = pass;
+                if (prev_pass)
+                  prev_pass->next = new_pass;
+                else
+                  *pass_list = new_pass;
+                break;
+              case PASS_POS_REPLACE:
+                new_pass->next = pass->next;
+                if (prev_pass)
+                  prev_pass->next = new_pass;
+                else
+                  *pass_list = new_pass;
+                new_pass->sub = pass->sub;
+                new_pass->tv_id = pass->tv_id;
+                pass = new_pass;
+                break;
+              default:
+                error ("Invalid pass positioning operation");
+                return false;
+            }
+
+          /* Save the newly added pass (instance) in the added_pass_nodes
+             list so that we can register its dump file later. Note that
+             we cannot register the dump file now because doing so will modify
+             the static_pass_number of the opt_pass object and therefore
+             mess up the dump file name of future instances.  */
+          new_pass_node = XCNEW (struct pass_list_node);
+          new_pass_node->pass = new_pass;
+          if (!added_pass_nodes)
+            added_pass_nodes = new_pass_node;
+          else
+            prev_added_pass_node->next = new_pass_node;
+          prev_added_pass_node = new_pass_node;
+
+          success = true;
+        }
+
+      if (pass->sub && position_pass (plugin_pass_info, &pass->sub))
+        success = true;
+    }
+
+  return success;
+}
+
+
+/* Hook into the pass lists (trees) a new pass registered by a plugin.
+
+   PLUGIN_NAME - display name for the plugin
+   PASS_INFO   - plugin pass information that specifies the opt_pass object,
+                 reference pass, instance number, and how to position
+                 the pass  */
+
+static void
+register_pass (const char *plugin_name, struct plugin_pass *pass_info)
+{
+  if (!pass_info->pass)
+    {
+      error ("No pass specified when registering a new pass in plugin %s",
+             plugin_name);
+      return;
+    }
+
+  if (!pass_info->reference_pass_name)
+    {
+      error ("No reference pass specified for positioning the pass "
+             " from plugin %s", plugin_name);
+      return;
+    }
+
+  /* Try to insert the new pass to the pass lists. We need to check all
+     three lists as the reference pass could be in one (or all) of them.  */
+  if (!position_pass (pass_info, &all_lowering_passes)
+      && !position_pass (pass_info, &all_ipa_passes)
+      && !position_pass (pass_info, &all_passes))
+    error ("Failed to position pass %s registered by plugin %s. "
+           "Cannot find the (specified instance of) reference pass %s",
+           pass_info->pass->name, plugin_name, pass_info->reference_pass_name);
+  else
+    {
+      /* OK, we have successfully inserted the new pass. We need to register
+         the dump files for the newly added pass and its duplicates (if any).
+         Because the registration of plugin passes happens after the
+         command-line options are parsed, the options that specify single
+         pass dumping (e.g. -fdump-tree-PASSNAME) cannot be used for new
+         plugin passes. Therefore we currently can only enable dumping of
+         new plugin passes when the 'dump-all' flags (e.g. -fdump-tree-all)
+         are specified. While doing so, we also delete the pass_list_node
+         objects created during pass positioning.  */
+      while (added_pass_nodes)
+        {
+          struct pass_list_node *next_node = added_pass_nodes->next;
+          enum tree_dump_index tdi;
+          register_one_dump_file (added_pass_nodes->pass);
+          if (added_pass_nodes->pass->type == SIMPLE_IPA_PASS
+              || added_pass_nodes->pass->type == IPA_PASS)
+            tdi = TDI_ipa_all;
+          else if (added_pass_nodes->pass->type == GIMPLE_PASS)
+            tdi = TDI_tree_all;
+          else
+            tdi = TDI_rtl_all;
+          /* Check if dump-all flag is specified.  */
+          if (get_dump_file_info (tdi)->state)
+            get_dump_file_info (added_pass_nodes->pass->static_pass_number)
+                ->state = get_dump_file_info (tdi)->state;
+          XDELETE (added_pass_nodes);
+          added_pass_nodes = next_node;
+        }
+    }
+}
+
+
+/* Register additional plugin information. NAME is the name passed to
+   plugin_init. INFO is the information that should be registered. */
+
+static void
+register_plugin_info (const char* name, struct plugin_info *info)
+{
+  void **slot = htab_find_slot (plugin_name_args_tab, name, NO_INSERT);
+  struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
+  plugin->version = info->version;
+  plugin->help = info->help;
+}
+
+/* Called from the plugin's initialization code. Register a single callback.
+   This function can be called multiple times.
+
+   PLUGIN_NAME - display name for this plugin
+   EVENT       - which event the callback is for
+   CALLBACK    - the callback to be called at the event
+   USER_DATA   - plugin-provided data   */
+
+void
+register_callback (const char *plugin_name,
+                   enum plugin_event event,
+                   plugin_callback_func callback,
+                   void *user_data)
+{
+  switch (event)
+    {
+      case PLUGIN_PASS_MANAGER_SETUP:
+	gcc_assert (!callback);
+        register_pass (plugin_name, (struct plugin_pass *) user_data);
+        break;
+      case PLUGIN_INFO:
+	gcc_assert (!callback);
+	register_plugin_info (plugin_name, (struct plugin_info *) user_data);
+	break;
+      case PLUGIN_REGISTER_GGC_ROOTS:
+	gcc_assert (!callback);
+        ggc_register_root_tab ((const struct ggc_root_tab*) user_data);
+	break;
+      case PLUGIN_FINISH_TYPE:
+      case PLUGIN_START_UNIT:
+      case PLUGIN_FINISH_UNIT:
+      case PLUGIN_CXX_CP_PRE_GENERICIZE:
+      case PLUGIN_GGC_START:
+      case PLUGIN_GGC_MARKING:
+      case PLUGIN_GGC_END:
+      case PLUGIN_ATTRIBUTES:
+      case PLUGIN_FINISH:
+        {
+          struct callback_info *new_callback;
+          if (!callback)
+            {
+              error ("Plugin %s registered a null callback function "
+		     "for event %s", plugin_name, plugin_event_name[event]);
+              return;
+            }
+          new_callback = XNEW (struct callback_info);
+          new_callback->plugin_name = plugin_name;
+          new_callback->func = callback;
+          new_callback->user_data = user_data;
+          new_callback->next = plugin_callbacks[event];
+          plugin_callbacks[event] = new_callback;
+        }
+        break;
+      case PLUGIN_EVENT_LAST:
+      default:
+        error ("Unkown callback event registered by plugin %s",
+               plugin_name);
+    }
+}
+
+
+/* Called from inside GCC.  Invoke all plug-in callbacks registered with
+   the specified event.
+
+   EVENT    - the event identifier
+   GCC_DATA - event-specific data provided by the compiler  */
+
+void
+invoke_plugin_callbacks (enum plugin_event event, void *gcc_data)
+{
+  timevar_push (TV_PLUGIN_RUN);
+
+  switch (event)
+    {
+      case PLUGIN_FINISH_TYPE:
+      case PLUGIN_START_UNIT:
+      case PLUGIN_FINISH_UNIT:
+      case PLUGIN_CXX_CP_PRE_GENERICIZE:
+      case PLUGIN_ATTRIBUTES:
+      case PLUGIN_FINISH:
+      case PLUGIN_GGC_START:
+      case PLUGIN_GGC_MARKING:
+      case PLUGIN_GGC_END:
+        {
+          /* Iterate over every callback registered with this event and
+             call it.  */
+          struct callback_info *callback = plugin_callbacks[event];
+          for ( ; callback; callback = callback->next)
+            (*callback->func) (gcc_data, callback->user_data);
+        }
+        break;
+
+      case PLUGIN_PASS_MANAGER_SETUP:
+      case PLUGIN_EVENT_LAST:
+      case PLUGIN_REGISTER_GGC_ROOTS:
+      default:
+        gcc_assert (false);
+    }
+
+  timevar_pop (TV_PLUGIN_RUN);
+}
+
+#ifdef ENABLE_PLUGIN
+/* We need a union to cast dlsym return value to a function pointer
+   as ISO C forbids assignment between function pointer and 'void *'.
+   Use explicit union instead of __extension__(<union_cast>) for
+   portability.  */
+#define PTR_UNION_TYPE(TOTYPE) union { void *_q; TOTYPE _nq; }
+#define PTR_UNION_AS_VOID_PTR(NAME) (NAME._q)
+#define PTR_UNION_AS_CAST_PTR(NAME) (NAME._nq)
+
+/* Try to initialize PLUGIN. Return true if successful. */
+
+static bool
+try_init_one_plugin (struct plugin_name_args *plugin)
+{
+  void *dl_handle;
+  plugin_init_func plugin_init;
+  char *err;
+  PTR_UNION_TYPE (plugin_init_func) plugin_init_union;
+
+  dl_handle = dlopen (plugin->full_name, RTLD_NOW);
+  if (!dl_handle)
+    {
+      error ("Cannot load plugin %s\n%s", plugin->full_name, dlerror ());
+      return false;
+    }
+
+  /* Clear any existing error.  */
+  dlerror ();
+
+  PTR_UNION_AS_VOID_PTR (plugin_init_union) =
+      dlsym (dl_handle, str_plugin_init_func_name);
+  plugin_init = PTR_UNION_AS_CAST_PTR (plugin_init_union);
+
+  if ((err = dlerror ()) != NULL)
+    {
+      error ("Cannot find %s in plugin %s\n%s", str_plugin_init_func_name,
+             plugin->full_name, err);
+      return false;
+    }
+
+  /* Call the plugin-provided initialization routine with the arguments.  */
+  if ((*plugin_init) (plugin, &gcc_version))
+    {
+      error ("Fail to initialize plugin %s", plugin->full_name);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* Routine to dlopen and initialize one plugin. This function is passed to
+   (and called by) the hash table traverse routine. Return 1 for the
+   htab_traverse to continue scan, 0 to stop.
+
+   SLOT - slot of the hash table element
+   INFO - auxiliary pointer handed to hash table traverse routine
+          (unused in this function)  */
+
+static int
+init_one_plugin (void **slot, void * ARG_UNUSED (info))
+{
+  struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
+  bool ok = try_init_one_plugin (plugin);
+  if (!ok)
+    {
+      htab_remove_elt (plugin_name_args_tab, plugin->base_name);
+      XDELETE (plugin);
+    }
+  return 1;
+}
+
+#endif	/* ENABLE_PLUGIN  */
+
+/* Main plugin initialization function.  Called from compile_file() in
+   toplev.c.  */
+
+void
+initialize_plugins (void)
+{
+  /* If no plugin was specified in the command-line, simply return.  */
+  if (!plugin_name_args_tab)
+    return;
+
+  timevar_push (TV_PLUGIN_INIT);
+ 
+#ifdef ENABLE_PLUGIN
+  /* Traverse and initialize each plugin specified in the command-line.  */
+  htab_traverse_noresize (plugin_name_args_tab, init_one_plugin, NULL);
+#endif
+
+  timevar_pop (TV_PLUGIN_INIT);
+}
+
+/* Release memory used by one plugin. */
+
+static int
+finalize_one_plugin (void **slot, void * ARG_UNUSED (info))
+{
+  struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
+  XDELETE (plugin);
+  return 1;
+}
+
+/* Free memory allocated by the plugin system. */
+
+void
+finalize_plugins (void)
+{
+  if (!plugin_name_args_tab)
+    return;
+
+  /* We can now delete the plugin_name_args object as it will no longer
+     be used. Note that base_name and argv fields (both of which were also
+     dynamically allocated) are not freed as they could still be used by
+     the plugin code.  */
+
+  htab_traverse_noresize (plugin_name_args_tab, finalize_one_plugin, NULL);
+
+  /* PLUGIN_NAME_ARGS_TAB is no longer needed, just delete it.  */
+  htab_delete (plugin_name_args_tab);
+  plugin_name_args_tab = NULL;
+}
+
+/* Used to pass options to htab_traverse callbacks. */
+
+struct print_options
+{
+  FILE *file;
+  const char *indent;
+};
+
+/* Print the version of one plugin. */
+
+static int
+print_version_one_plugin (void **slot, void *data)
+{
+  struct print_options *opt = (struct print_options *) data;
+  struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
+  const char *version = plugin->version ? plugin->version : "Unknown version.";
+
+  fprintf (opt->file, " %s%s: %s\n", opt->indent, plugin->base_name, version);
+  return 1;
+}
+
+/* Print the version of each plugin. */
+
+void
+print_plugins_versions (FILE *file, const char *indent)
+{
+  struct print_options opt;
+  opt.file = file;
+  opt.indent = indent;
+  if (!plugin_name_args_tab || htab_elements (plugin_name_args_tab) == 0)
+    return;
+
+  fprintf (file, "%sVersions of loaded plugins:\n", indent);
+  htab_traverse_noresize (plugin_name_args_tab, print_version_one_plugin, &opt);
+}
+
+/* Print help for one plugin. SLOT is the hash table slot. DATA is the
+   argument to htab_traverse_noresize. */
+
+static int
+print_help_one_plugin (void **slot, void *data)
+{
+  struct print_options *opt = (struct print_options *) data;
+  struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
+  const char *help = plugin->help ? plugin->help : "No help available .";
+
+  char *dup = xstrdup (help);
+  char *p, *nl;
+  fprintf (opt->file, " %s%s:\n", opt->indent, plugin->base_name);
+
+  for (p = nl = dup; nl; p = nl)
+    {
+      nl = strchr (nl, '\n');
+      if (nl)
+	{
+	  *nl = '\0';
+	  nl++;
+	}
+      fprintf (opt->file, "   %s %s\n", opt->indent, p);
+    }
+
+  free (dup);
+  return 1;
+}
+
+/* Print help for each plugin. The output goes to FILE and every line starts
+   with INDENT. */
+
+void
+print_plugins_help (FILE *file, const char *indent)
+{
+  struct print_options opt;
+  opt.file = file;
+  opt.indent = indent;
+  if (!plugin_name_args_tab || htab_elements (plugin_name_args_tab) == 0)
+    return;
+
+  fprintf (file, "%sHelp for the loaded plugins:\n", indent);
+  htab_traverse_noresize (plugin_name_args_tab, print_help_one_plugin, &opt);
+}
+
+
+/* Return true if plugins have been loaded.  */
+
+bool
+plugins_active_p (void)
+{
+  enum plugin_event event;
+
+  for (event = PLUGIN_PASS_MANAGER_SETUP; event < PLUGIN_EVENT_LAST; event++)
+    if (plugin_callbacks[event])
+      return true;
+
+  return false;
+}
+
+
+/* Dump to FILE the names and associated events for all the active
+   plugins.  */
+
+void
+dump_active_plugins (FILE *file)
+{
+  enum plugin_event event;
+
+  if (!plugins_active_p ())
+    return;
+
+  fprintf (stderr, "Event\t\t\tPlugins\n");
+  for (event = PLUGIN_PASS_MANAGER_SETUP; event < PLUGIN_EVENT_LAST; event++)
+    if (plugin_callbacks[event])
+      {
+	struct callback_info *ci;
+
+	fprintf (file, "%s\t", plugin_event_name[event]);
+
+	for (ci = plugin_callbacks[event]; ci; ci = ci->next)
+	  fprintf (file, "%s ", ci->plugin_name);
+
+	fprintf (file, "\n");
+      }
+}
+
+
+/* Dump active plugins to stderr.  */
+
+void
+debug_active_plugins (void)
+{
+  dump_active_plugins (stderr);
+}
+
+/* The default version check. Compares every field in VERSION. */
+
+bool
+plugin_default_version_check (struct plugin_gcc_version *gcc_version,
+			      struct plugin_gcc_version *plugin_version)
+{
+  /* version is NULL if the plugin was not linked with plugin-version.o */
+  if (!gcc_version || !plugin_version)
+    return false;
+
+  if (strcmp (gcc_version->basever, plugin_version->basever))
+    return false;
+  if (strcmp (gcc_version->datestamp, plugin_version->datestamp))
+    return false;
+  if (strcmp (gcc_version->devphase, plugin_version->devphase))
+    return false;
+  if (strcmp (gcc_version->revision, plugin_version->revision))
+    return false;
+  if (strcmp (gcc_version->configuration_arguments,
+	      plugin_version->configuration_arguments))
+    return false;
+  return true;
+}