1  /* Utilities for querying and manipulating type trees.
       2     Copyright (C) 2013-2023 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 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    if (pred (t))
      37      return t;
      38  
      39    enum tree_code code = TREE_CODE (t);
      40  
      41    if (code == POINTER_TYPE || code == REFERENCE_TYPE
      42        || code == PARM_DECL || code == OFFSET_TYPE
      43        || code == FUNCTION_TYPE || code == METHOD_TYPE
      44        || code == ARRAY_TYPE)
      45      return find_type_usage (TREE_TYPE (t), pred);
      46  
      47    if (TYPE_PTRMEMFUNC_P (t))
      48      return find_type_usage
      49        (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (t)), pred);
      50  
      51    return NULL_TREE;
      52  }
      53  
      54  #endif // GCC_CP_TYPE_UTILS_H