/* Traits for hashing trees.
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Copyright (C) 2014-2017 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef tree_hash_traits_h
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#define tree_hash_traits_h
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/* Hash for trees based on operand_equal_p. */
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struct tree_operand_hash : ggc_ptr_hash <tree_node>
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{
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static inline hashval_t hash (const value_type &);
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static inline bool equal (const value_type &,
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const compare_type &);
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};
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inline hashval_t
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tree_operand_hash::hash (const value_type &t)
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{
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return iterative_hash_expr (t, 0);
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}
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inline bool
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tree_operand_hash::equal (const value_type &t1,
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const compare_type &t2)
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{
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return operand_equal_p (t1, t2, 0);
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}
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/* Hasher for tree decls. Pointer equality is enough here, but the DECL_UID
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is a better hash than the pointer value and gives a predictable traversal
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order. */
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struct tree_decl_hash : ggc_ptr_hash <tree_node>
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{
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static inline hashval_t hash (tree);
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};
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inline hashval_t
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tree_decl_hash::hash (tree t)
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{
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return DECL_UID (t);
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}
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/* Hash for SSA_NAMEs in the same function. Pointer equality is enough
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here, but the SSA_NAME_VERSION is a better hash than the pointer
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value and gives a predictable traversal order. */
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struct tree_ssa_name_hash : ggc_ptr_hash <tree_node>
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{
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static inline hashval_t hash (tree);
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};
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inline hashval_t
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tree_ssa_name_hash::hash (tree t)
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{
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return SSA_NAME_VERSION (t);
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}
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/* Hasher for general trees, based on their TREE_HASH. */
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struct tree_hash : ggc_ptr_hash <tree_node>
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{
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static hashval_t hash (tree);
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};
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inline hashval_t
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tree_hash::hash (tree t)
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{
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return TREE_HASH (t);
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}
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#endif
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