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annotate liboctave/util/oct-locbuf.h @ 19731:4197fc428c7d

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maint: Update copyright notices for 2015.
author John W. Eaton <jwe@octave.org>
date Wed, 11 Feb 2015 14:19:08 -0500
parents ebb3ef964372
children
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1 /*
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2
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3 Copyright (C) 2008-2015 Jaroslav Hajek
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if !defined (octave_oct_locbuf_h)
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24 #define octave_oct_locbuf_h 1
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25
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26 #include <cstddef>
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27 #include "oct-cmplx.h"
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28
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29 // The default local buffer simply encapsulates an *array* pointer
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30 // that gets deleted automatically. For common POD types, we provide
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31 // specializations.
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32
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33 template <class T>
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34 class octave_local_buffer
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35 {
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36 public:
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37 octave_local_buffer (size_t size)
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38 : data (0)
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39 {
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40 if (size)
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41 data = new T [size];
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42 }
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43 ~octave_local_buffer (void) { delete [] data; }
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44 operator T *() const { return data; }
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45
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46 private:
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47 T *data;
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48
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49 // No copying!
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50 octave_local_buffer (const octave_local_buffer&);
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51 octave_local_buffer& operator = (const octave_local_buffer&);
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52 };
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53
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54 // For buffers of POD types, we'll be smarter. There is one thing
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55 // that differentiates a local buffer from a dynamic array - the local
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56 // buffers, if not manipulated improperly, have a FIFO semantics,
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57 // meaning that if buffer B is allocated after buffer A, B *must* be
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58 // deallocated before A. This is *guaranteed* if you use local buffer
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59 // exclusively through the OCTAVE_LOCAL_BUFFER macro, because the C++
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60 // standard requires that explicit local objects be destroyed in
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61 // reverse order of declaration. Therefore, we can avoid memory
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62 // fragmentation by allocating fairly large chunks of memory and
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63 // serving local buffers from them in a stack-like manner. The first
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64 // returning buffer in previous chunk will be responsible for
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65 // deallocating the chunk.
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66
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67 class octave_chunk_buffer
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68 {
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69 public:
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70
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71 OCTAVE_API octave_chunk_buffer (size_t size);
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72
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73 OCTAVE_API virtual ~octave_chunk_buffer (void);
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74
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75 char *data (void) const { return dat; }
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76
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77 static OCTAVE_API void clear (void);
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78
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79 private:
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80
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81 // The number of bytes we allocate for each large chunk of memory we
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82 // manage.
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83 static const size_t chunk_size;
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84
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85 // Pointer to the end end of the last allocation.
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86 static char *top;
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87
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88 // Pointer to the current active chunk.
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89 static char *chunk;
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90
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91 // The number of bytes remaining in the active chunk.
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92 static size_t left;
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93
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94 // The number of active allocations.
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95 static size_t active;
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96
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97 // Pointer to the current chunk.
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98 char *cnk;
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99
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100 // Pointer to the beginning of the most recent allocation.
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101 char *dat;
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102
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103 // No copying!
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104 octave_chunk_buffer (const octave_chunk_buffer&);
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105 octave_chunk_buffer& operator = (const octave_chunk_buffer&);
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106 };
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107
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108 // This specializes octave_local_buffer to use the chunked buffer
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109 // mechanism for POD types.
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110 #define SPECIALIZE_POD_BUFFER(TYPE) \
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111 template <> \
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112 class octave_local_buffer<TYPE> : private octave_chunk_buffer \
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113 { \
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114 public: \
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115 octave_local_buffer (size_t size) \
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116 : octave_chunk_buffer (size * sizeof (TYPE)) { } \
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117 \
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118 operator TYPE *() const \
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119 { \
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120 return reinterpret_cast<TYPE *> (this->data ()); \
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121 } \
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122 }
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123
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124 SPECIALIZE_POD_BUFFER (bool);
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125 SPECIALIZE_POD_BUFFER (char);
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126 SPECIALIZE_POD_BUFFER (unsigned short);
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127 SPECIALIZE_POD_BUFFER (short);
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128 SPECIALIZE_POD_BUFFER (int);
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129 SPECIALIZE_POD_BUFFER (unsigned int);
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130 SPECIALIZE_POD_BUFFER (long);
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131 SPECIALIZE_POD_BUFFER (unsigned long);
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132 SPECIALIZE_POD_BUFFER (float);
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133 SPECIALIZE_POD_BUFFER (double);
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134 // FIXME: Are these guaranteed to be POD and satisfy alignment?
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135 SPECIALIZE_POD_BUFFER (Complex);
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136 SPECIALIZE_POD_BUFFER (FloatComplex);
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137 // MORE ?
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138
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139 // All pointers and const pointers are also POD types.
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140 template <class T>
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141 class octave_local_buffer<T *> : private octave_chunk_buffer
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142 {
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143 public:
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144 octave_local_buffer (size_t size)
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145 : octave_chunk_buffer (size * sizeof (T *))
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146 { }
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147
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148 operator T **() const { return reinterpret_cast<T **> (this->data ()); }
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149 };
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150
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151 template <class T>
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152 class octave_local_buffer<const T *> : private octave_chunk_buffer
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153 {
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154 public:
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155 octave_local_buffer (size_t size)
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156 : octave_chunk_buffer (size * sizeof (const T *))
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157 { }
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158
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159 operator const T **() const
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160 {
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161 return reinterpret_cast<const T **> (this->data ());
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162 }
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163 };
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164
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165 // If the compiler supports dynamic stack arrays, we can use the
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166 // attached hack to place small buffer arrays on the stack. It may be
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167 // even faster than our obstack-like optimization, but is dangerous
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168 // because stack is a very limited resource, so we disable it.
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169
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170 #if 0 // defined (HAVE_DYNAMIC_AUTO_ARRAYS)
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171
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172 // Maximum buffer size (in bytes) to be placed on the stack.
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173
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174 #define OCTAVE_LOCAL_BUFFER_MAX_STACK_SIZE 8192
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175
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176 // If we have automatic arrays, we use an automatic array if the size
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177 // is small enough. To avoid possibly evaluating 'size' multiple
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178 // times, we first cache it. Note that we always construct both the
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179 // stack array and the octave_local_buffer object, but only one of
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180 // them will be nonempty.
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181
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182 #define OCTAVE_LOCAL_BUFFER(T, buf, size) \
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183 const size_t _bufsize_ ## buf = size; \
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184 const bool _lbufaut_ ## buf = _bufsize_ ## buf * sizeof (T) \
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185 <= OCTAVE_LOCAL_BUFFER_MAX_STACK_SIZE; \
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186 T _bufaut_ ## buf [_lbufaut_ ## buf ? _bufsize_ ## buf : 0]; \
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187 octave_local_buffer<T> _bufheap_ ## buf \
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188 (!_lbufaut_ ## buf ? _bufsize_ ## buf : 0); \
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189 T *buf = _lbufaut_ ## buf \
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190 ? _bufaut_ ## buf : static_cast<T *> (_bufheap_ ## buf)
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191
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192 #else
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193
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194 // If we don't have automatic arrays, we simply always use
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195 // octave_local_buffer.
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196
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197 #define OCTAVE_LOCAL_BUFFER(T, buf, size) \
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198 octave_local_buffer<T> _buffer_ ## buf (size); \
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199 T *buf = _buffer_ ## buf
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200
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201 #endif
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202
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203 // Note: we use weird variables in the for loop to avoid warnings
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204 // about shadowed parameters.
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205
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206 #define OCTAVE_LOCAL_BUFFER_INIT(T, buf, size, value) \
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207 OCTAVE_LOCAL_BUFFER (T, buf, size); \
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208 for (size_t _buf_iter = 0, _buf_size = size; \
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209 _buf_iter < _buf_size; _buf_iter++) \
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210 buf[_buf_iter] = value
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211
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212 #endif
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213