1  /* Demonstrates how to add custom attributes */
       2  
       3  #include "gcc-plugin.h"
       4  #include <stdlib.h>
       5  #include "config.h"
       6  #include "system.h"
       7  #include "coretypes.h"
       8  #include "tree.h"
       9  #include "tree-pass.h"
      10  #include "intl.h"
      11  #include "toplev.h"
      12  #include "plugin.h"
      13  #include "diagnostic.h"
      14  
      15  int plugin_is_GPL_compatible;
      16  
      17  /* Attribute handler callback */
      18  
      19  static tree
      20  handle_user_attribute (tree *node, tree name, tree args,
      21  			int flags, bool *no_add_attrs)
      22  {
      23    return NULL_TREE;
      24  }
      25  
      26  /* Attribute definition */
      27  
      28  static struct attribute_spec user_attr =
      29    { "user", 1, 1, false,  false, false, false, handle_user_attribute, NULL };
      30  
      31  /* Plugin callback called during attribute registration */
      32  
      33  static void 
      34  register_attributes (void *event_data, void *data) 
      35  {
      36    warning (0, G_("Callback to register attributes"));
      37    register_attribute (&user_attr);
      38  }
      39  
      40  /* Callback function to invoke before the function body is genericized.  */ 
      41  
      42  void
      43  handle_pre_generic (void *event_data, void *data)
      44  {
      45    tree fndecl = (tree) event_data;
      46    tree arg;
      47    for (arg = DECL_ARGUMENTS(fndecl); arg; arg = DECL_CHAIN (arg)) {
      48        tree attr;
      49        for (attr = DECL_ATTRIBUTES (arg); attr; attr = TREE_CHAIN (attr)) {
      50            tree attrname = TREE_PURPOSE (attr);
      51            tree attrargs = TREE_VALUE (attr);
      52            warning (0, G_("attribute '%s' on param '%s' of function %s"),
      53                     IDENTIFIER_POINTER (attrname),
      54                     IDENTIFIER_POINTER (DECL_NAME (arg)),
      55                     IDENTIFIER_POINTER (DECL_NAME (fndecl))
      56                     );
      57        }
      58    }
      59  }
      60  
      61  int
      62  plugin_init (struct plugin_name_args *plugin_info,
      63               struct plugin_gcc_version *version)
      64  {
      65    const char *plugin_name = plugin_info->base_name;
      66    register_callback (plugin_name, PLUGIN_PRE_GENERICIZE,
      67                       handle_pre_generic, NULL);
      68  
      69    register_callback (plugin_name, PLUGIN_ATTRIBUTES, register_attributes, NULL);
      70    return 0;
      71  }