1 // -*- C++ -*- 2 3 // Copyright (C) 2005, 2006, 2007, 2008, 2009 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 hash_load_check_resize_trigger_imp.hpp 38 * Contains a resize trigger implementation. 39 */ 40 41 PB_DS_CLASS_T_DEC 42 PB_DS_CLASS_C_DEC:: 43 hash_load_check_resize_trigger(float load_min, float load_max) 44 : m_load_min(load_min), m_load_max(load_max), m_next_shrink_size(0), 45 m_next_grow_size(0), m_resize_needed(false) 46 { _GLIBCXX_DEBUG_ONLY(assert_valid();) } 47 48 PB_DS_CLASS_T_DEC 49 inline void 50 PB_DS_CLASS_C_DEC:: 51 notify_find_search_start() 52 { _GLIBCXX_DEBUG_ONLY(assert_valid();) } 53 54 PB_DS_CLASS_T_DEC 55 inline void 56 PB_DS_CLASS_C_DEC:: 57 notify_find_search_collision() 58 { _GLIBCXX_DEBUG_ONLY(assert_valid();) } 59 60 PB_DS_CLASS_T_DEC 61 inline void 62 PB_DS_CLASS_C_DEC:: 63 notify_find_search_end() 64 { _GLIBCXX_DEBUG_ONLY(assert_valid();) } 65 66 PB_DS_CLASS_T_DEC 67 inline void 68 PB_DS_CLASS_C_DEC:: 69 notify_insert_search_start() 70 { _GLIBCXX_DEBUG_ONLY(assert_valid();) } 71 72 PB_DS_CLASS_T_DEC 73 inline void 74 PB_DS_CLASS_C_DEC:: 75 notify_insert_search_collision() 76 { _GLIBCXX_DEBUG_ONLY(assert_valid();) } 77 78 PB_DS_CLASS_T_DEC 79 inline void 80 PB_DS_CLASS_C_DEC:: 81 notify_insert_search_end() 82 { _GLIBCXX_DEBUG_ONLY(assert_valid();) } 83 84 PB_DS_CLASS_T_DEC 85 inline void 86 PB_DS_CLASS_C_DEC:: 87 notify_erase_search_start() 88 { _GLIBCXX_DEBUG_ONLY(assert_valid();) } 89 90 PB_DS_CLASS_T_DEC 91 inline void 92 PB_DS_CLASS_C_DEC:: 93 notify_erase_search_collision() 94 { _GLIBCXX_DEBUG_ONLY(assert_valid();) } 95 96 PB_DS_CLASS_T_DEC 97 inline void 98 PB_DS_CLASS_C_DEC:: 99 notify_erase_search_end() 100 { _GLIBCXX_DEBUG_ONLY(assert_valid();) } 101 102 PB_DS_CLASS_T_DEC 103 inline void 104 PB_DS_CLASS_C_DEC:: 105 notify_inserted(size_type num_entries) 106 { 107 m_resize_needed = (num_entries >= m_next_grow_size); 108 size_base::set_size(num_entries); 109 _GLIBCXX_DEBUG_ONLY(assert_valid();) 110 } 111 112 PB_DS_CLASS_T_DEC 113 inline void 114 PB_DS_CLASS_C_DEC:: 115 notify_erased(size_type num_entries) 116 { 117 size_base::set_size(num_entries); 118 m_resize_needed = num_entries <= m_next_shrink_size; 119 _GLIBCXX_DEBUG_ONLY(assert_valid();) 120 } 121 122 PB_DS_CLASS_T_DEC 123 inline bool 124 PB_DS_CLASS_C_DEC:: 125 is_resize_needed() const 126 { 127 _GLIBCXX_DEBUG_ONLY(assert_valid();) 128 return m_resize_needed; 129 } 130 131 PB_DS_CLASS_T_DEC 132 inline bool 133 PB_DS_CLASS_C_DEC:: 134 is_grow_needed(size_type /*size*/, size_type num_entries) const 135 { 136 _GLIBCXX_DEBUG_ASSERT(m_resize_needed); 137 return num_entries >= m_next_grow_size; 138 } 139 140 PB_DS_CLASS_T_DEC 141 PB_DS_CLASS_C_DEC:: 142 ~hash_load_check_resize_trigger() { } 143 144 PB_DS_CLASS_T_DEC 145 void 146 PB_DS_CLASS_C_DEC:: 147 notify_resized(size_type new_size) 148 { 149 m_resize_needed = false; 150 m_next_grow_size = size_type(m_load_max * new_size - 1); 151 m_next_shrink_size = size_type(m_load_min * new_size); 152 153 #ifdef PB_DS_HT_MAP_RESIZE_TRACE_ 154 std::cerr << "hlcrt::notify_resized " << 155 static_cast<unsigned long>(new_size) << " " << 156 static_cast<unsigned long>(m_load_min) << " " << 157 static_cast<unsigned long>(m_load_max) << " " << 158 static_cast<unsigned long>(m_next_shrink_size) << " " << 159 static_cast<unsigned long>(m_next_grow_size) << " " << std::endl; 160 #endif 161 162 _GLIBCXX_DEBUG_ONLY(assert_valid();) 163 } 164 165 PB_DS_CLASS_T_DEC 166 void 167 PB_DS_CLASS_C_DEC:: 168 notify_externally_resized(size_type new_size) 169 { 170 m_resize_needed = false; 171 size_type new_grow_size = size_type(m_load_max * new_size - 1); 172 size_type new_shrink_size = size_type(m_load_min * new_size); 173 if (new_grow_size >= m_next_grow_size) 174 { 175 _GLIBCXX_DEBUG_ASSERT(new_shrink_size > m_next_shrink_size); 176 m_next_grow_size = new_grow_size; 177 _GLIBCXX_DEBUG_ONLY(assert_valid();) 178 179 #ifdef PB_DS_HT_MAP_RESIZE_TRACE_ 180 std::cerr << "hlcrt::notify_externally_resized1 " << 181 static_cast<unsigned long>(new_size) << " " << 182 static_cast<unsigned long>(m_load_min) << " " << 183 static_cast<unsigned long>(m_load_max) << " " << 184 static_cast<unsigned long>(m_next_shrink_size) << " " << 185 static_cast<unsigned long>(m_next_grow_size) << " " << std::endl; 186 #endif 187 return; 188 } 189 190 _GLIBCXX_DEBUG_ASSERT(new_shrink_size <= m_next_shrink_size); 191 m_next_shrink_size = new_shrink_size; 192 193 #ifdef PB_DS_HT_MAP_RESIZE_TRACE_ 194 std::cerr << "hlcrt::notify_externally_resized2 " << 195 static_cast<unsigned long>(new_size) << " " << 196 static_cast<unsigned long>(m_load_min) << " " << 197 static_cast<unsigned long>(m_load_max) << " " << 198 static_cast<unsigned long>(m_next_shrink_size) << " " << 199 static_cast<unsigned long>(m_next_grow_size) << " " << std::endl; 200 #endif 201 202 _GLIBCXX_DEBUG_ONLY(assert_valid();) 203 } 204 205 PB_DS_CLASS_T_DEC 206 void 207 PB_DS_CLASS_C_DEC:: 208 notify_cleared() 209 { 210 _GLIBCXX_DEBUG_ONLY(assert_valid();) 211 size_base::set_size(0); 212 m_resize_needed = (0 < m_next_shrink_size); 213 _GLIBCXX_DEBUG_ONLY(assert_valid();) 214 } 215 216 PB_DS_CLASS_T_DEC 217 void 218 PB_DS_CLASS_C_DEC:: 219 swap(PB_DS_CLASS_C_DEC& other) 220 { 221 _GLIBCXX_DEBUG_ONLY(assert_valid();) 222 _GLIBCXX_DEBUG_ONLY(other.assert_valid();) 223 224 size_base::swap(other); 225 std::swap(m_load_min, other.m_load_min); 226 std::swap(m_load_max, other.m_load_max); 227 std::swap(m_resize_needed, other.m_resize_needed); 228 std::swap(m_next_grow_size, other.m_next_grow_size); 229 std::swap(m_next_shrink_size, other.m_next_shrink_size); 230 231 _GLIBCXX_DEBUG_ONLY(assert_valid();) 232 _GLIBCXX_DEBUG_ONLY(other.assert_valid();) 233 } 234 235 PB_DS_CLASS_T_DEC 236 inline std::pair<float, float> 237 PB_DS_CLASS_C_DEC:: 238 get_loads() const 239 { 240 PB_DS_STATIC_ASSERT(access, external_load_access); 241 return std::make_pair(m_load_min, m_load_max); 242 } 243 244 PB_DS_CLASS_T_DEC 245 void 246 PB_DS_CLASS_C_DEC:: 247 set_loads(std::pair<float, float> load_pair) 248 { 249 PB_DS_STATIC_ASSERT(access, external_load_access); 250 const float old_load_min = m_load_min; 251 const float old_load_max = m_load_max; 252 const size_type old_next_shrink_size = m_next_shrink_size; 253 const size_type old_next_grow_size = m_next_grow_size; 254 const bool old_resize_needed = m_resize_needed; 255 256 __try 257 { 258 m_load_min = load_pair.first; 259 m_load_max = load_pair.second; 260 do_resize(static_cast<size_type>(size_base::get_size() / ((m_load_min + m_load_max) / 2))); 261 } 262 __catch(...) 263 { 264 m_load_min = old_load_min; 265 m_load_max = old_load_max; 266 m_next_shrink_size = old_next_shrink_size; 267 m_next_grow_size = old_next_grow_size; 268 m_resize_needed = old_resize_needed; 269 __throw_exception_again; 270 } 271 } 272 273 PB_DS_CLASS_T_DEC 274 void 275 PB_DS_CLASS_C_DEC:: 276 do_resize(size_type) 277 { std::abort(); } 278 279 #ifdef _GLIBCXX_DEBUG 280 PB_DS_CLASS_T_DEC 281 void 282 PB_DS_CLASS_C_DEC:: 283 assert_valid() const 284 { 285 _GLIBCXX_DEBUG_ASSERT(m_load_max > m_load_min); 286 _GLIBCXX_DEBUG_ASSERT(m_next_grow_size >= m_next_shrink_size); 287 } 288 #endif 289 290
