216 lines
4.9 KiB
C
216 lines
4.9 KiB
C
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/* Copyright (C) 2009-2022 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU Transactional Memory Library (libitm).
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Libitm is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libitm 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 FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Implements an AA tree (http://en.wikipedia.org/wiki/AA_tree) with an
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integer key, and data attached to the node via flexible array member. */
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#ifndef LIBITM_AATREE_H
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#define LIBITM_AATREE_H 1
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namespace GTM HIDDEN {
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template<typename KEY> class aa_tree_key;
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class aa_node_base
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{
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public:
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static const bool L = false;
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static const bool R = true;
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private:
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typedef unsigned int level_type;
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aa_node_base *m_link[2];
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level_type m_level;
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static const aa_node_base s_nil;
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public:
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aa_node_base(level_type l = 1)
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: m_link { const_cast<aa_node_base *>(&s_nil),
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const_cast<aa_node_base *>(&s_nil) },
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m_level(l)
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{ }
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bool is_nil() const { return this == &s_nil; }
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aa_node_base * link(bool d) { return m_link[d]; }
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void set_link(bool d, aa_node_base *val) { m_link[d] = val; }
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aa_node_base *skew();
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aa_node_base *split();
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void decrease_level();
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static void *operator new (size_t s) { return xmalloc (s); }
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static void operator delete (void *p) { free (p); }
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};
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template<typename KEY>
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struct aa_node_key : public aa_node_base
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{
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typedef aa_node_base base;
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KEY key;
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explicit aa_node_key(KEY k) : key(k) { }
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aa_node_key * link(bool d)
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{
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return static_cast<aa_node_key *>(base::link(d));
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}
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aa_node_key *skew() { return static_cast<aa_node_key *>(base::skew()); }
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aa_node_key *split() { return static_cast<aa_node_key *>(base::split()); }
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};
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template<typename KEY, typename DATA>
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struct aa_node : public aa_node_key<KEY>
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{
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typedef aa_node_key<KEY> base;
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DATA data;
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explicit aa_node(KEY k) : base(k) { }
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aa_node * link(bool d)
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{
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return static_cast<aa_node *>(base::link(d));
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}
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};
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template<typename KEY>
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class aa_tree_key
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{
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public:
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typedef aa_node_key<KEY> node;
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typedef node *node_ptr;
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protected:
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node_ptr m_tree;
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protected:
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aa_tree_key() : m_tree(0) { }
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node_ptr find(KEY k) const;
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static node_ptr insert_1 (node_ptr t, node_ptr n);
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void insert(node_ptr n);
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static node_ptr erase_1 (node_ptr t, KEY k, node_ptr *pfree);
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node_ptr erase(KEY k);
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};
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extern template class aa_tree_key<uintptr_t>;
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template<typename KEY, typename DATA>
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class aa_tree : public aa_tree_key<KEY>
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{
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public:
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typedef aa_tree_key<KEY> base;
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typedef aa_node<KEY, DATA> node;
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typedef node *node_ptr;
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typedef void (*trav_callback)(KEY, DATA *, void *);
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private:
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static void clear_1 (node_ptr);
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static void traverse_1 (node_ptr, trav_callback, void *);
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public:
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aa_tree() = default;
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~aa_tree() { clear(); }
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static void *operator new (size_t s, aa_tree<KEY, DATA>* p) { return p; }
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DATA *find(KEY k) const
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{
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node_ptr n = static_cast<node_ptr>(base::find (k));
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return n ? &n->data : 0;
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}
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DATA *insert(KEY k)
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{
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node_ptr n = new node(k);
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base::insert(n);
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return &n->data;
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}
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void erase(KEY k)
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{
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node_ptr n = static_cast<node_ptr>(base::erase (k));
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delete n;
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}
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node_ptr remove(KEY k, DATA** data)
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{
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node_ptr n = static_cast<node_ptr>(base::erase (k));
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*data = (n ? &n->data : 0);
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return n;
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}
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void clear()
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{
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node_ptr n = static_cast<node_ptr>(this->m_tree);
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if (n)
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{
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this->m_tree = 0;
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clear_1 (n);
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}
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}
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void traverse (trav_callback cb, void *cb_data)
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{
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node_ptr t = static_cast<node_ptr>(this->m_tree);
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if (t != 0)
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traverse_1 (t, cb, cb_data);
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}
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};
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template<typename KEY, typename DATA>
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void
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aa_tree<KEY, DATA>::clear_1 (node_ptr t)
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{
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if (t->is_nil())
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return;
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clear_1 (t->link(node::L));
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clear_1 (t->link(node::R));
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delete t;
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}
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template<typename KEY, typename DATA>
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void
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aa_tree<KEY, DATA>::traverse_1 (node_ptr t, trav_callback cb, void *cb_data)
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{
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if (t->is_nil())
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return;
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cb (t->key, &t->data, cb_data);
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traverse_1 (t->link(node::L), cb, cb_data);
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traverse_1 (t->link(node::R), cb, cb_data);
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}
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} // namespace GTM
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#endif // LIBITM_AATREE_H
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