gcc/cp/type-utils.h

   1 /* Utilities for querying and manipulating type trees.
   2    Copyright (C) 2013-2018 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_CP_TYPE_UTILS_H
  21 #define GCC_CP_TYPE_UTILS_H
  22
  23 /* Returns the first tree within T that is directly matched by PRED.  T may be a
  24    type or PARM_DECL and is incrementally decomposed toward its type-specifier
  25    until a match is found.  NULL_TREE is returned if PRED does not match any
  26    part of T.
  27
  28    This is primarily intended for detecting whether T uses `auto' or a concept
  29    identifier.  Since either of these can only appear as a type-specifier for
  30    the declaration in question, only top-level qualifications are traversed;
  31    find_type_usage does not look through the whole type.  */
  32
  33 inline tree
  34 find_type_usage (tree t, bool (*pred) (const_tree))
  35 {
  36   enum tree_code code;
  37   if (pred (t))
  38     return t;
  39
  40   code = TREE_CODE (t);
  41
  42   if (code == POINTER_TYPE || code == REFERENCE_TYPE
  43       || code == PARM_DECL || code == OFFSET_TYPE
  44       || code == FUNCTION_TYPE || code == METHOD_TYPE
  45       || code == ARRAY_TYPE)
  46     return find_type_usage (TREE_TYPE (t), pred);
  47
  48   if (TYPE_PTRMEMFUNC_P (t))
  49     return find_type_usage
  50       (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (t)), pred);
  51
  52   return NULL_TREE;
  53 }
  54
  55 #endif // GCC_CP_TYPE_UTILS_H