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1 /* Utilities for querying and manipulating type trees.
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2 Copyright (C) 2013-2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 GCC is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef GCC_CP_TYPE_UTILS_H
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21 #define GCC_CP_TYPE_UTILS_H
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22
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23 /* Returns the first tree within T that is directly matched by PRED. T may be a
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24 type or PARM_DECL and is incrementally decomposed toward its type-specifier
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25 until a match is found. NULL_TREE is returned if PRED does not match any
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26 part of T.
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27
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28 This is primarily intended for detecting whether T uses `auto' or a concept
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29 identifier. Since either of these can only appear as a type-specifier for
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30 the declaration in question, only top-level qualifications are traversed;
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31 find_type_usage does not look through the whole type. */
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32
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33 inline tree
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34 find_type_usage (tree t, bool (*pred) (const_tree))
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35 {
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36 enum tree_code code;
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37 if (pred (t))
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38 return t;
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39
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40 code = TREE_CODE (t);
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41
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42 if (code == POINTER_TYPE || code == REFERENCE_TYPE
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43 || code == PARM_DECL || code == OFFSET_TYPE
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44 || code == FUNCTION_TYPE || code == METHOD_TYPE
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45 || code == ARRAY_TYPE)
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46 return find_type_usage (TREE_TYPE (t), pred);
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47
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48 if (TYPE_PTRMEMFUNC_P (t))
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49 return find_type_usage
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50 (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (t)), pred);
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51
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52 return NULL_TREE;
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53 }
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54
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55 #endif // GCC_CP_TYPE_UTILS_H
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