libstdc++
gp_hash_table_map_/resize_fn_imps.hpp
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1 // -*- C++ -*-
2 
3 // Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
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5 //
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12 // This library is distributed in the hope that it will be useful, but
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17 // Under Section 7 of GPL version 3, you are granted additional
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19 // 3.1, as published by the Free Software Foundation.
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25 
26 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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28 // Permission to use, copy, modify, sell, and distribute this software
29 // is hereby granted without fee, provided that the above copyright
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36 
37 /**
38  * @file gp_hash_table_map_/resize_fn_imps.hpp
39  * Contains implementations of gp_ht_map_'s resize related functions.
40  */
41 
42 PB_DS_CLASS_T_DEC
43 inline bool
44 PB_DS_CLASS_C_DEC::
45 do_resize_if_needed()
46 {
47  if (!resize_base::is_resize_needed())
48  return false;
49  resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
50  return true;
51 }
52 
53 PB_DS_CLASS_T_DEC
54 void
55 PB_DS_CLASS_C_DEC::
56 do_resize(size_type n)
57 { resize_imp(resize_base::get_nearest_larger_size(n)); }
58 
59 PB_DS_CLASS_T_DEC
60 inline void
61 PB_DS_CLASS_C_DEC::
62 do_resize_if_needed_no_throw()
63 {
64  if (!resize_base::is_resize_needed())
65  return;
66 
67  __try
68  {
69  resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
70  }
71  __catch(...)
72  { }
73 
74  PB_DS_ASSERT_VALID((*this))
75 }
76 
77 PB_DS_CLASS_T_DEC
78 void
79 PB_DS_CLASS_C_DEC::
80 resize_imp(size_type new_size)
81 {
82 #ifdef PB_DS_REGRESSION
83  typename _Alloc::group_adjustor adjust(m_num_e);
84 #endif
85 
86  if (new_size == m_num_e)
87  return;
88 
89  PB_DS_ASSERT_VALID((*this))
90  const size_type old_size = m_num_e;
91  entry_array a_entries_resized = 0;
92 
93  // Following line might throw an exception.
94  a_entries_resized = s_entry_allocator.allocate(new_size);
95 
96  ranged_probe_fn_base::notify_resized(new_size);
97  m_num_e = new_size;
98 
99  for (size_type i = 0; i < m_num_e; ++i)
100  a_entries_resized[i].m_stat = empty_entry_status;
101 
102  __try
103  {
104  resize_imp(a_entries_resized, old_size);
105  }
106  __catch(...)
107  {
108  erase_all_valid_entries(a_entries_resized, new_size);
109  m_num_e = old_size;
110  s_entry_allocator.deallocate(a_entries_resized, new_size);
111  ranged_probe_fn_base::notify_resized(old_size);
112  __throw_exception_again;
113  }
114 
115  // At this point no exceptions can be thrown.
116  _GLIBCXX_DEBUG_ONLY(assert_entry_array_valid(a_entries_resized,
117  traits_base::m_store_extra_indicator,
118  __FILE__, __LINE__);)
119 
120  Resize_Policy::notify_resized(new_size);
121  erase_all_valid_entries(m_entries, old_size);
122  s_entry_allocator.deallocate(m_entries, old_size);
123  m_entries = a_entries_resized;
124  PB_DS_ASSERT_VALID((*this))
125 }
126 
127 PB_DS_CLASS_T_DEC
128 void
129 PB_DS_CLASS_C_DEC::
130 resize_imp(entry_array a_entries_resized, size_type old_size)
131 {
132  for (size_type pos = 0; pos < old_size; ++pos)
133  if (m_entries[pos].m_stat == valid_entry_status)
134  resize_imp_reassign(m_entries + pos, a_entries_resized,
135  traits_base::m_store_extra_indicator);
136 }
137 
140