1 /* A type-safe hash map.
2 Copyright (C) 2014-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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/>. */
24 template<typename KeyId
, typename Value
,
26 class GTY((user
)) hash_map
28 typedef typename
Traits::key_type Key
;
34 typedef hash_entry value_type
;
35 typedef Key compare_type
;
37 static hashval_t
hash (const hash_entry
&e
)
39 return Traits::hash (e
.m_key
);
42 static bool equal (const hash_entry
&a
, const Key
&b
)
44 return Traits::equal_keys (a
.m_key
, b
);
47 static void remove (hash_entry
&e
) { Traits::remove (e
); }
49 static void mark_deleted (hash_entry
&e
) { Traits::mark_deleted (e
); }
51 static bool is_deleted (const hash_entry
&e
)
53 return Traits::is_deleted (e
);
56 static void mark_empty (hash_entry
&e
) { Traits::mark_empty (e
); }
57 static bool is_empty (const hash_entry
&e
) { return Traits::is_empty (e
); }
59 static void ggc_mx (hash_entry
&e
)
62 gt_ggc_mx (e
.m_value
);
65 static void pch_nx (hash_entry
&e
)
68 gt_pch_nx (e
.m_value
);
71 static void pch_nx (hash_entry
&e
, gt_pointer_operator op
, void *c
)
73 pch_nx_helper (e
.m_key
, op
, c
);
74 pch_nx_helper (e
.m_value
, op
, c
);
80 pch_nx_helper (T
&x
, gt_pointer_operator op
, void *cookie
)
82 gt_pch_nx (&x
, op
, cookie
);
86 pch_nx_helper (int, gt_pointer_operator
, void *)
91 pch_nx_helper (unsigned int, gt_pointer_operator
, void *)
96 pch_nx_helper (bool, gt_pointer_operator
, void *)
102 pch_nx_helper (T
*&x
, gt_pointer_operator op
, void *cookie
)
109 explicit hash_map (size_t n
= 13, bool ggc
= false,
110 bool gather_mem_stats
= true CXX_MEM_STAT_INFO
)
111 : m_table (n
, ggc
, gather_mem_stats
, HASH_MAP_ORIGIN PASS_MEM_STAT
) {}
113 /* Create a hash_map in ggc memory. */
114 static hash_map
*create_ggc (size_t size
, bool gather_mem_stats
= true
117 hash_map
*map
= ggc_alloc
<hash_map
> ();
118 new (map
) hash_map (size
, true, gather_mem_stats PASS_MEM_STAT
);
122 /* If key k isn't already in the map add key k with value v to the map, and
123 return false. Otherwise set the value of the entry for key k to be v and
126 bool put (const Key
&k
, const Value
&v
)
128 hash_entry
*e
= m_table
.find_slot_with_hash (k
, Traits::hash (k
),
130 bool existed
= !hash_entry::is_empty (*e
);
138 /* if the passed in key is in the map return its value otherwise NULL. */
140 Value
*get (const Key
&k
)
142 hash_entry
&e
= m_table
.find_with_hash (k
, Traits::hash (k
));
143 return Traits::is_empty (e
) ? NULL
: &e
.m_value
;
146 /* Return a reference to the value for the passed in key, creating the entry
147 if it doesn't already exist. If existed is not NULL then it is set to false
148 if the key was not previously in the map, and true otherwise. */
150 Value
&get_or_insert (const Key
&k
, bool *existed
= NULL
)
152 hash_entry
*e
= m_table
.find_slot_with_hash (k
, Traits::hash (k
),
154 bool ins
= Traits::is_empty (*e
);
164 void remove (const Key
&k
)
166 m_table
.remove_elt_with_hash (k
, Traits::hash (k
));
169 /* Call the call back on each pair of key and value with the passed in
172 template<typename Arg
, bool (*f
)(const typename
Traits::key_type
&,
174 void traverse (Arg a
) const
176 for (typename hash_table
<hash_entry
>::iterator iter
= m_table
.begin ();
177 iter
!= m_table
.end (); ++iter
)
178 f ((*iter
).m_key
, (*iter
).m_value
, a
);
181 template<typename Arg
, bool (*f
)(const typename
Traits::key_type
&,
183 void traverse (Arg a
) const
185 for (typename hash_table
<hash_entry
>::iterator iter
= m_table
.begin ();
186 iter
!= m_table
.end (); ++iter
)
187 if (!f ((*iter
).m_key
, &(*iter
).m_value
, a
))
191 size_t elements () const { return m_table
.elements (); }
196 explicit iterator (const typename hash_table
<hash_entry
>::iterator
&iter
) :
199 iterator
&operator++ ()
205 std::pair
<Key
, Value
> operator* ()
207 hash_entry
&e
= *m_iter
;
208 return std::pair
<Key
, Value
> (e
.m_key
, e
.m_value
);
212 operator != (const iterator
&other
) const
214 return m_iter
!= other
.m_iter
;
218 typename hash_table
<hash_entry
>::iterator m_iter
;
221 /* Standard iterator retrieval methods. */
223 iterator
begin () const { return iterator (m_table
.begin ()); }
224 iterator
end () const { return iterator (m_table
.end ()); }
228 template<typename T
, typename U
, typename V
> friend void gt_ggc_mx (hash_map
<T
, U
, V
> *);
229 template<typename T
, typename U
, typename V
> friend void gt_pch_nx (hash_map
<T
, U
, V
> *);
230 template<typename T
, typename U
, typename V
> friend void gt_pch_nx (hash_map
<T
, U
, V
> *, gt_pointer_operator
, void *);
232 hash_table
<hash_entry
> m_table
;
235 /* ggc marking routines. */
237 template<typename K
, typename V
, typename H
>
239 gt_ggc_mx (hash_map
<K
, V
, H
> *h
)
241 gt_ggc_mx (&h
->m_table
);
244 template<typename K
, typename V
, typename H
>
246 gt_pch_nx (hash_map
<K
, V
, H
> *h
)
248 gt_pch_nx (&h
->m_table
);
251 template<typename K
, typename V
, typename H
>
253 gt_pch_nx (hash_map
<K
, V
, H
> *h
, gt_pointer_operator op
, void *cookie
)
255 op (&h
->m_table
.m_entries
, cookie
);