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annotate druntime/src/common/core/memory.d @ 1458:e0b2d67cfe7c

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Added druntime (this should be removed once it works).
author Robert Clipsham <robert@octarineparrot.com>
date Tue, 02 Jun 2009 17:43:06 +0100
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1458
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1 /**
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2 * The memory module provides an interface to the garbage collector and to
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3 * any other OS or API-level memory management facilities.
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4 *
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5 * Copyright: Copyright Sean Kelly 2005 - 2009.
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6 * License: <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>.
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7 * Authors: Sean Kelly
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8 *
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9 * Copyright Sean Kelly 2005 - 2009.
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10 * Distributed under the Boost Software License, Version 1.0.
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11 * (See accompanying file LICENSE_1_0.txt or copy at
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12 * http://www.boost.org/LICENSE_1_0.txt)
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13 */
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14 module core.memory;
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15
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16
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17 private
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18 {
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19 extern (C) void gc_init();
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20 extern (C) void gc_term();
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21
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22 extern (C) void gc_enable();
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23 extern (C) void gc_disable();
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24 extern (C) void gc_collect();
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25 extern (C) void gc_minimize();
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26
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27 extern (C) uint gc_getAttr( void* p );
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28 extern (C) uint gc_setAttr( void* p, uint a );
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29 extern (C) uint gc_clrAttr( void* p, uint a );
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30
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31 extern (C) void* gc_malloc( size_t sz, uint ba = 0 );
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32 extern (C) void* gc_calloc( size_t sz, uint ba = 0 );
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33 extern (C) void* gc_realloc( void* p, size_t sz, uint ba = 0 );
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34 extern (C) size_t gc_extend( void* p, size_t mx, size_t sz );
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35 extern (C) size_t gc_reserve( size_t sz );
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36 extern (C) void gc_free( void* p );
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37
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38 extern (C) void* gc_addrOf( void* p );
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39 extern (C) size_t gc_sizeOf( void* p );
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40
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41 struct BlkInfo_
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42 {
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43 void* base;
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44 size_t size;
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45 uint attr;
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46 }
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47
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48 extern (C) BlkInfo_ gc_query( void* p );
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49
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50 extern (C) void gc_addRoot( void* p );
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51 extern (C) void gc_addRange( void* p, size_t sz );
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52
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53 extern (C) void gc_removeRoot( void* p );
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54 extern (C) void gc_removeRange( void* p );
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55 }
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56
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57
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58 /**
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59 * This struct encapsulates all garbage collection functionality for the D
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60 * programming language.
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61 */
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62 struct GC
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63 {
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64 /**
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65 * Enables automatic garbage collection behavior if collections have
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66 * previously been suspended by a call to disable. This function is
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67 * reentrant, and must be called once for every call to disable before
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68 * automatic collections are enabled.
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69 */
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70 static void enable()
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71 {
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72 gc_enable();
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73 }
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74
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75
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76 /**
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77 * Disables automatic garbage collections performed to minimize the
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78 * process footprint. Collections may continue to occur in instances
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79 * where the implementation deems necessary for correct program behavior,
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80 * such as during an out of memory condition. This function is reentrant,
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81 * but enable must be called once for each call to disable.
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82 */
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83 static void disable()
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84 {
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85 gc_disable();
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86 }
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87
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88
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89 /**
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90 * Begins a full collection. While the meaning of this may change based
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91 * on the garbage collector implementation, typical behavior is to scan
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92 * all stack segments for roots, mark accessible memory blocks as alive,
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93 * and then to reclaim free space. This action may need to suspend all
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94 * running threads for at least part of the collection process.
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95 */
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96 static void collect()
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97 {
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98 gc_collect();
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99 }
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100
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101 /**
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102 * Indicates that the managed memory space be minimized by returning free
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103 * physical memory to the operating system. The amount of free memory
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104 * returned depends on the allocator design and on program behavior.
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105 */
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106 static void minimize()
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107 {
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108 gc_minimize();
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109 }
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110
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111
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112 /**
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113 * Elements for a bit field representing memory block attributes. These
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114 * are manipulated via the getAttr, setAttr, clrAttr functions.
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115 */
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116 enum BlkAttr : uint
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117 {
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118 FINALIZE = 0b0000_0001, /// Finalize the data in this block on collect.
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119 NO_SCAN = 0b0000_0010, /// Do not scan through this block on collect.
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120 NO_MOVE = 0b0000_0100 /// Do not move this memory block on collect.
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121 }
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122
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123
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124 /**
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125 * Contains aggregate information about a block of managed memory. The
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126 * purpose of this struct is to support a more efficient query style in
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127 * instances where detailed information is needed.
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128 *
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129 * base = A pointer to the base of the block in question.
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130 * size = The size of the block, calculated from base.
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131 * attr = Attribute bits set on the memory block.
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132 */
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133 alias BlkInfo_ BlkInfo;
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134
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135
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136 /**
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137 * Returns a bit field representing all block attributes set for the memory
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138 * referenced by p. If p references memory not originally allocated by
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139 * this garbage collector, points to the interior of a memory block, or if
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140 * p is null, zero will be returned.
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141 *
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142 * Params:
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143 * p = A pointer to the root of a valid memory block or to null.
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144 *
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145 * Returns:
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146 * A bit field containing any bits set for the memory block referenced by
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147 * p or zero on error.
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148 */
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149 static uint getAttr( void* p )
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150 {
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151 return gc_getAttr( p );
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152 }
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153
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154
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155 /**
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156 * Sets the specified bits for the memory references by p. If p references
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157 * memory not originally allocated by this garbage collector, points to the
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158 * interior of a memory block, or if p is null, no action will be
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159 * performed.
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160 *
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161 * Params:
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162 * p = A pointer to the root of a valid memory block or to null.
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163 * a = A bit field containing any bits to set for this memory block.
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164 *
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165 * The result of a call to getAttr after the specified bits have been
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166 * set.
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167 */
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168 static uint setAttr( void* p, uint a )
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169 {
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170 return gc_setAttr( p, a );
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171 }
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172
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173
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174 /**
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175 * Clears the specified bits for the memory references by p. If p
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176 * references memory not originally allocated by this garbage collector,
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177 * points to the interior of a memory block, or if p is null, no action
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178 * will be performed.
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179 *
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180 * Params:
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181 * p = A pointer to the root of a valid memory block or to null.
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182 * a = A bit field containing any bits to clear for this memory block.
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183 *
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184 * Returns:
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185 * The result of a call to getAttr after the specified bits have been
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186 * cleared.
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187 */
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188 static uint clrAttr( void* p, uint a )
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189 {
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190 return gc_clrAttr( p, a );
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191 }
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192
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193
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194 /**
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195 * Requests an aligned block of managed memory from the garbage collector.
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196 * This memory may be deleted at will with a call to free, or it may be
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197 * discarded and cleaned up automatically during a collection run. If
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198 * allocation fails, this function will call onOutOfMemory which is
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199 * expected to throw an OutOfMemoryException.
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200 *
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201 * Params:
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202 * sz = The desired allocation size in bytes.
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203 * ba = A bitmask of the attributes to set on this block.
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204 *
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205 * Returns:
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206 * A reference to the allocated memory or null if insufficient memory
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207 * is available.
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208 *
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209 * Throws:
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210 * OutOfMemoryException on allocation failure.
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211 */
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212 static void* malloc( size_t sz, uint ba = 0 )
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213 {
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214 return gc_malloc( sz, ba );
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215 }
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216
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217
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218 /**
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219 * Requests an aligned block of managed memory from the garbage collector,
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220 * which is initialized with all bits set to zero. This memory may be
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221 * deleted at will with a call to free, or it may be discarded and cleaned
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222 * up automatically during a collection run. If allocation fails, this
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223 * function will call onOutOfMemory which is expected to throw an
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224 * OutOfMemoryException.
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225 *
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226 * Params:
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227 * sz = The desired allocation size in bytes.
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228 * ba = A bitmask of the attributes to set on this block.
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229 *
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230 * Returns:
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231 * A reference to the allocated memory or null if insufficient memory
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232 * is available.
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233 *
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234 * Throws:
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235 * OutOfMemoryException on allocation failure.
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236 */
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237 static void* calloc( size_t sz, uint ba = 0 )
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238 {
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239 return gc_calloc( sz, ba );
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240 }
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241
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242
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243 /**
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244 * If sz is zero, the memory referenced by p will be deallocated as if
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245 * by a call to free. A new memory block of size sz will then be
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246 * allocated as if by a call to malloc, or the implementation may instead
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247 * resize the memory block in place. The contents of the new memory block
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248 * will be the same as the contents of the old memory block, up to the
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249 * lesser of the new and old sizes. Note that existing memory will only
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250 * be freed by realloc if sz is equal to zero. The garbage collector is
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251 * otherwise expected to later reclaim the memory block if it is unused.
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252 * If allocation fails, this function will call onOutOfMemory which is
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253 * expected to throw an OutOfMemoryException. If p references memory not
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254 * originally allocated by this garbage collector, or if it points to the
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255 * interior of a memory block, no action will be taken. If ba is zero
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256 * (the default) and p references the head of a valid, known memory block
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257 * then any bits set on the current block will be set on the new block if a
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258 * reallocation is required. If ba is not zero and p references the head
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259 * of a valid, known memory block then the bits in ba will replace those on
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260 * the current memory block and will also be set on the new block if a
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261 * reallocation is required.
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262 *
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263 * Params:
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264 * p = A pointer to the root of a valid memory block or to null.
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265 * sz = The desired allocation size in bytes.
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266 * ba = A bitmask of the attributes to set on this block.
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267 *
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268 * Returns:
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269 * A reference to the allocated memory on success or null if sz is
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270 * zero. On failure, the original value of p is returned.
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271 *
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272 * Throws:
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273 * OutOfMemoryException on allocation failure.
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274 */
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275 static void* realloc( void* p, size_t sz, uint ba = 0 )
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276 {
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277 return gc_realloc( p, sz, ba );
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278 }
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279
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280
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281 /**
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282 * Requests that the managed memory block referenced by p be extended in
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283 * place by at least mx bytes, with a desired extension of sz bytes. If an
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284 * extension of the required size is not possible, if p references memory
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285 * not originally allocated by this garbage collector, or if p points to
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286 * the interior of a memory block, no action will be taken.
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287 *
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288 * Params:
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289 * mx = The minimum extension size in bytes.
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290 * sz = The desired extension size in bytes.
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291 *
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292 * Returns:
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293 * The size in bytes of the extended memory block referenced by p or zero
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294 * if no extension occurred.
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295 */
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296 static size_t extend( void* p, size_t mx, size_t sz )
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297 {
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298 return gc_extend( p, mx, sz );
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299 }
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300
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301
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302 /**
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303 * Requests that at least sz bytes of memory be obtained from the operating
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304 * system and marked as free.
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305 *
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306 * Params:
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307 * sz = The desired size in bytes.
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308 *
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309 * Returns:
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310 * The actual number of bytes reserved or zero on error.
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311 */
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312 static size_t reserve( size_t sz )
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313 {
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314 return gc_reserve( sz );
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315 }
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316
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317
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318 /**
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319 * Deallocates the memory referenced by p. If p is null, no action
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320 * occurs. If p references memory not originally allocated by this
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321 * garbage collector, or if it points to the interior of a memory block,
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322 * no action will be taken. The block will not be finalized regardless
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323 * of whether the FINALIZE attribute is set. If finalization is desired,
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324 * use delete instead.
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325 *
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326 * Params:
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327 * p = A pointer to the root of a valid memory block or to null.
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328 */
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329 static void free( void* p )
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330 {
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331 gc_free( p );
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332 }
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333
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334
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335 /**
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336 * Returns the base address of the memory block containing p. This value
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337 * is useful to determine whether p is an interior pointer, and the result
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338 * may be passed to routines such as sizeOf which may otherwise fail. If p
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339 * references memory not originally allocated by this garbage collector, if
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340 * p is null, or if the garbage collector does not support this operation,
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341 * null will be returned.
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342 *
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343 * Params:
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344 * p = A pointer to the root or the interior of a valid memory block or to
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345 * null.
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346 *
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347 * Returns:
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348 * The base address of the memory block referenced by p or null on error.
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349 */
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350 static void* addrOf( void* p )
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351 {
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352 return gc_addrOf( p );
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353 }
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354
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355
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356 /**
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357 * Returns the true size of the memory block referenced by p. This value
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358 * represents the maximum number of bytes for which a call to realloc may
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359 * resize the existing block in place. If p references memory not
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360 * originally allocated by this garbage collector, points to the interior
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361 * of a memory block, or if p is null, zero will be returned.
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362 *
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363 * Params:
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364 * p = A pointer to the root of a valid memory block or to null.
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365 *
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366 * Returns:
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367 * The size in bytes of the memory block referenced by p or zero on error.
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368 */
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369 static size_t sizeOf( void* p )
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370 {
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371 return gc_sizeOf( p );
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372 }
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373
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374
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375 /**
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376 * Returns aggregate information about the memory block containing p. If p
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377 * references memory not originally allocated by this garbage collector, if
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378 * p is null, or if the garbage collector does not support this operation,
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379 * BlkInfo.init will be returned. Typically, support for this operation
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380 * is dependent on support for addrOf.
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381 *
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382 * Params:
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383 * p = A pointer to the root or the interior of a valid memory block or to
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384 * null.
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385 *
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386 * Returns:
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387 * Information regarding the memory block referenced by p or BlkInfo.init
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388 * on error.
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389 */
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390 static BlkInfo query( void* p )
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391 {
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392 return gc_query( p );
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393 }
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394
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395
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396 /**
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397 * Adds the memory address referenced by p to an internal list of roots to
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398 * be scanned during a collection. If p is null, no operation is
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399 * performed.
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400 *
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401 * Params:
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402 * p = A pointer to a valid memory address or to null.
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403 */
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404 static void addRoot( void* p )
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405 {
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406 gc_addRoot( p );
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407 }
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408
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409
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410 /**
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411 * Adds the memory block referenced by p and of size sz to an internal list
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412 * of ranges to be scanned during a collection. If p is null, no operation
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413 * is performed.
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414 *
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415 * Params:
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416 * p = A pointer to a valid memory address or to null.
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417 * sz = The size in bytes of the block to add. If sz is zero then the
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418 * no operation will occur. If p is null then sz must be zero.
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419 */
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420 static void addRange( void* p, size_t sz )
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421 {
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422 gc_addRange( p, sz );
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423 }
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424
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425
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426 /**
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427 * Removes the memory block referenced by p from an internal list of roots
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428 * to be scanned during a collection. If p is null or does not represent
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429 * a value previously passed to add(void*) then no operation is performed.
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430 *
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431 * p = A pointer to a valid memory address or to null.
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432 */
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433 static void removeRoot( void* p )
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434 {
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435 gc_removeRoot( p );
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436 }
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437
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438
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439 /**
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440 * Removes the memory block referenced by p from an internal list of ranges
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441 * to be scanned during a collection. If p is null or does not represent
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442 * a value previously passed to add(void*, size_t) then no operation is
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443 * performed.
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444 *
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445 * Params:
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446 * p = A pointer to a valid memory address or to null.
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447 */
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448 static void removeRange( void* p )
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449 {
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450 gc_removeRange( p );
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451 }
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452 }