1 files changed, 66 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/plugin/attribute_plugin.c b/gcc/testsuite/g++.dg/plugin/attribute_plugin.c
new file mode 100644
index 00000000000..d071762102b
--- /dev/null
+++ b/gcc/testsuite/g++.dg/plugin/attribute_plugin.c
@@ -0,0 +1,66 @@
+/* Demonstrates how to add custom attributes */
+
+#include <stdlib.h>
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tree.h"
+#include "tree-pass.h"
+#include "intl.h"
+#include "gcc-plugin.h"
+
+/* Attribute handler callback */
+
+static tree
+handle_user_attribute (tree *node, tree name, tree args,
+			int flags, bool *no_add_attrs)
+{
+  return NULL_TREE;
+}
+
+/* Attribute definition */
+
+static struct attribute_spec user_attr =
+  { "user", 1, 1, false,  false, false, handle_user_attribute };
+
+/* Plugin callback called during attribute registration */
+
+static void 
+register_attributes (void *event_data, void *data) 
+{
+  warning (0, G_("Callback to register attributes"));
+  register_attribute (&user_attr);
+}
+
+/* Callback function to invoke before the function body is genericized.  */ 
+
+void
+handle_pre_generic (void *event_data, void *data)
+{
+  tree fndecl = (tree) event_data;
+  tree arg;
+  for (arg = DECL_ARGUMENTS(fndecl); arg; arg = TREE_CHAIN (arg)) {
+      tree attr;
+      for (attr = DECL_ATTRIBUTES (arg); attr; attr = TREE_CHAIN (attr)) {
+          tree attrname = TREE_PURPOSE (attr);
+          tree attrargs = TREE_VALUE (attr);
+          warning (0, G_("attribute '%s' on param '%s' of function %s"),
+                   IDENTIFIER_POINTER (attrname),
+                   IDENTIFIER_POINTER (DECL_NAME (arg)),
+                   IDENTIFIER_POINTER (DECL_NAME (fndecl))
+                   );
+      }
+  }
+}
+
+int
+plugin_init (const char *plugin_name,
+             struct plugin_gcc_version *version,
+             int argc, struct plugin_argument *argv)
+{
+  register_callback (plugin_name, PLUGIN_CXX_CP_PRE_GENERICIZE,
+                     handle_pre_generic, NULL);
+
+  register_callback (plugin_name, PLUGIN_ATTRIBUTES, register_attributes, NULL);
+  return 0;
+}