libstdc++
cc_hash_table_map_/resize_fn_imps.hpp
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1// -*- C++ -*-
2
3// Copyright (C) 2005-2019 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the terms
7// of the GNU General Public License as published by the Free Software
8// Foundation; either version 3, or (at your option) any later
9// version.
10
11// This library is distributed in the hope that it will be useful, but
12// WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14// General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
26
27// Permission to use, copy, modify, sell, and distribute this software
28// is hereby granted without fee, provided that the above copyright
29// notice appears in all copies, and that both that copyright notice
30// and this permission notice appear in supporting documentation. None
31// of the above authors, nor IBM Haifa Research Laboratories, make any
32// representation about the suitability of this software for any
33// purpose. It is provided "as is" without express or implied
34// warranty.
35
36/**
37 * @file cc_hash_table_map_/resize_fn_imps.hpp
38 * Contains implementations of cc_ht_map_'s resize related functions.
39 */
40
41PB_DS_CLASS_T_DEC
42inline bool
43PB_DS_CLASS_C_DEC::
44do_resize_if_needed()
45{
46 if (!resize_base::is_resize_needed())
47 return false;
48 resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
49 return true;
50}
51
52PB_DS_CLASS_T_DEC
53void
54PB_DS_CLASS_C_DEC::
55do_resize(size_type len)
56{ resize_imp(resize_base::get_nearest_larger_size(len)); }
57
58PB_DS_CLASS_T_DEC
59inline void
60PB_DS_CLASS_C_DEC::
61do_resize_if_needed_no_throw()
62{
63 if (!resize_base::is_resize_needed())
64 return;
65
66 __try
67 {
68 resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
69 }
70 __catch(...)
71 { }
72
73 PB_DS_ASSERT_VALID((*this))
74}
75
76PB_DS_CLASS_T_DEC
77void
78PB_DS_CLASS_C_DEC::
79resize_imp(size_type new_size)
80{
81 PB_DS_ASSERT_VALID((*this))
82 if (new_size == m_num_e)
83 return;
84
85 const size_type old_size = m_num_e;
86 entry_pointer_array a_p_entries_resized;
87
88 // Following line might throw an exception.
89 ranged_hash_fn_base::notify_resized(new_size);
90
91 __try
92 {
93 // Following line might throw an exception.
94 a_p_entries_resized = s_entry_pointer_allocator.allocate(new_size);
95 m_num_e = new_size;
96 }
97 __catch(...)
98 {
99 ranged_hash_fn_base::notify_resized(old_size);
100 __throw_exception_again;
101 }
102
103 // At this point no exceptions can be thrown.
104 resize_imp_no_exceptions(new_size, a_p_entries_resized, old_size);
105 Resize_Policy::notify_resized(new_size);
106 PB_DS_ASSERT_VALID((*this))
107}
108
109PB_DS_CLASS_T_DEC
110void
111PB_DS_CLASS_C_DEC::
112resize_imp_no_exceptions(size_type new_size, entry_pointer_array a_p_entries_resized, size_type old_size)
113{
114 std::fill(a_p_entries_resized, a_p_entries_resized + m_num_e,
115 entry_pointer(0));
116
117 for (size_type pos = 0; pos < old_size; ++pos)
118 {
119 entry_pointer p_e = m_entries[pos];
120 while (p_e != 0)
121 p_e = resize_imp_no_exceptions_reassign_pointer(p_e, a_p_entries_resized, traits_base::m_store_extra_indicator);
122 }
123
124 m_num_e = new_size;
125 _GLIBCXX_DEBUG_ONLY(assert_entry_pointer_array_valid(a_p_entries_resized,
126 __FILE__, __LINE__);)
127 s_entry_pointer_allocator.deallocate(m_entries, old_size);
128 m_entries = a_p_entries_resized;
129 PB_DS_ASSERT_VALID((*this))
130}
131
134