2009-04-16 Rafael Avila de Espindola <espindola@google.com>

	* common.opt (fhelp): Add Var(help_flag).
	* gcc-plugin.h (plugin_info): Add help.
	* plugin.c (plugin_name_args): Add help.
	(register_plugin_info): Set plugin->help.
	(print_help_one_plugin): New.
	(print_plugins_help): New.
	* plugin.h (print_plugins_help): New.
	* toplev.c (toplev_main): Call print_plugins_help if needed.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@146195 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 47 insertions, 0 deletions

diff --git a/gcc/plugin.c b/gcc/plugin.c
index 95297a7d395..4d4addd3bd8 100644
--- a/gcc/plugin.c
+++ b/gcc/plugin.c
@@ -61,6 +61,7 @@ struct plugin_name_args
   int argc;
   struct plugin_argument *argv;
   const char *version;
+  const char *help;
 };
 
 /* Hash table for the plugin_name_args objects created during command-line
@@ -461,6 +462,7 @@ 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.
@@ -708,6 +710,51 @@ print_plugins_versions (FILE *file, const char *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.  */