gcc/objc/objc-tree.def

   1 /* This file contains the definitions and documentation for the
   2    additional tree codes used in the Objective C front end (see tree.def
   3    for the standard codes).
   4    Copyright (C) 1990-2017 Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22
  23 /* Objective-C types.  */
  24 DEFTREECODE (CLASS_INTERFACE_TYPE, "class_interface_type", tcc_type, 0)
  25 DEFTREECODE (CLASS_IMPLEMENTATION_TYPE, "class_implementation_type",
  26              tcc_type, 0)
  27 DEFTREECODE (CATEGORY_INTERFACE_TYPE, "category_interface_type", tcc_type, 0)
  28 DEFTREECODE (CATEGORY_IMPLEMENTATION_TYPE,"category_implementation_type",
  29              tcc_type, 0)
  30 DEFTREECODE (PROTOCOL_INTERFACE_TYPE, "protocol_interface_type", tcc_type, 0)
  31
  32 /* Objective-C decls.  */
  33 DEFTREECODE (KEYWORD_DECL, "keyword_decl", tcc_declaration, 0)
  34 DEFTREECODE (INSTANCE_METHOD_DECL, "instance_method_decl", tcc_declaration, 0)
  35 DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", tcc_declaration, 0)
  36 DEFTREECODE (PROPERTY_DECL, "property_decl", tcc_declaration, 0)
  37
  38 /* Objective-C expressions.  */
  39 DEFTREECODE (MESSAGE_SEND_EXPR, "message_send_expr", tcc_expression, 3)
  40 DEFTREECODE (CLASS_REFERENCE_EXPR, "class_reference_expr", tcc_expression, 1)
  41
  42 /* This tree is used to represent the expression 'object.property',
  43    where 'object' is an Objective-C object and 'property' is an
  44    Objective-C property.  Operand 0 is the object (the tree
  45    representing the expression), and Operand 1 is the property (the
  46    PROPERTY_DECL).  Operand 2 is the 'getter' call, ready to be used;
  47    we pregenerate it because it is hard to generate it properly later
  48    on.  Operand 3 records whether using the 'getter' call should
  49    generate a deprecation warning or not.
  50
  51    A PROPERTY_REF tree needs to be transformed into 'setter' and
  52    'getter' calls at some point; at the moment this happens in two
  53    places:
  54
  55      * if we detect that a modify expression is being applied to a
  56        PROPERTY_REF, then we transform that into a 'getter' call (this
  57        happens in build_modify_expr() or cp_build_modify_expr()).
  58
  59     * else, it will remain as a PROPERTY_REF until we get to
  60       gimplification; at that point, we convert each PROPERTY_REF into
  61       a 'getter' call during ObjC/ObjC++ gimplify.  At that point, it
  62       is quite hard to build a 'getter' call, but we have already built
  63       it and we just need to swap Operand 2 in, and emit the deprecation
  64       warnings from Operand 3 if needed.
  65
  66   Please note that when the Objective-C 2.0 "dot-syntax" 'object.component'
  67   is encountered, where 'component' is not a property but there are valid
  68   setter/getter methods for it, an artificial PROPERTY_DECL is generated
  69   and used in the PROPERTY_REF.  */
  70 DEFTREECODE (PROPERTY_REF, "property_ref", tcc_expression, 4)
  71
  72 /*
  73 Local variables:
  74 mode:c
  75 End:
  76 */