Mercurial > projects > ldc
annotate druntime/src/common/core/memory.d @ 759:d3eb054172f9
Added copy of druntime from DMD 2.020 modified for LDC.
author | Tomas Lindquist Olsen <tomas.l.olsen@gmail.com> |
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date | Tue, 11 Nov 2008 01:52:37 +0100 |
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d3eb054172f9
Added copy of druntime from DMD 2.020 modified for LDC.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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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 (c) 2005-2008, The D Runtime Project |
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6 * License: BSD Style, see LICENSE |
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7 * Authors: Sean Kelly |
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8 */ |
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9 module core.memory; |
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10 |
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11 |
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12 private |
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13 { |
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14 extern (C) void gc_init(); |
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15 extern (C) void gc_term(); |
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16 |
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17 extern (C) void gc_enable(); |
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18 extern (C) void gc_disable(); |
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19 extern (C) void gc_collect(); |
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20 extern (C) void gc_minimize(); |
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21 |
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22 extern (C) uint gc_getAttr( void* p ); |
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23 extern (C) uint gc_setAttr( void* p, uint a ); |
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24 extern (C) uint gc_clrAttr( void* p, uint a ); |
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25 |
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26 extern (C) void* gc_malloc( size_t sz, uint ba = 0 ); |
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27 extern (C) void* gc_calloc( size_t sz, uint ba = 0 ); |
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28 extern (C) void* gc_realloc( void* p, size_t sz, uint ba = 0 ); |
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29 extern (C) size_t gc_extend( void* p, size_t mx, size_t sz ); |
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30 extern (C) size_t gc_reserve( size_t sz ); |
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31 extern (C) void gc_free( void* p ); |
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32 |
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33 extern (C) void* gc_addrOf( void* p ); |
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34 extern (C) size_t gc_sizeOf( void* p ); |
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35 |
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36 struct BlkInfo_ |
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37 { |
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38 void* base; |
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39 size_t size; |
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40 uint attr; |
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41 } |
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42 |
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43 extern (C) BlkInfo_ gc_query( void* p ); |
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44 |
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45 extern (C) void gc_addRoot( void* p ); |
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46 extern (C) void gc_addRange( void* p, size_t sz ); |
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47 |
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48 extern (C) void gc_removeRoot( void* p ); |
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49 extern (C) void gc_removeRange( void* p ); |
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50 |
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51 extern (C) void* gc_getHandle(); |
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52 extern (C) void gc_setHandle( void* p ); |
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53 extern (C) void gc_endHandle(); |
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54 } |
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55 |
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56 |
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57 /** |
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58 * This struct encapsulates all garbage collection functionality for the D |
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59 * programming language. |
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60 */ |
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61 struct GC |
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62 { |
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63 /** |
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64 * Enables the garbage collector if collections have previously been |
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65 * suspended by a call to disable. This function is reentrant, and |
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66 * must be called once for every call to disable before the garbage |
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67 * collector is enabled. |
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68 */ |
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69 static void enable() |
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70 { |
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71 gc_enable(); |
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72 } |
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73 |
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74 |
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75 /** |
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76 * Disables the garbage collector. This function is reentrant, but |
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77 * enable must be called once for each call to disable. |
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78 */ |
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79 static void disable() |
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80 { |
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81 gc_disable(); |
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82 } |
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83 |
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84 |
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85 /** |
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86 * Begins a full collection. While the meaning of this may change based |
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87 * on the garbage collector implementation, typical behavior is to scan |
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88 * all stack segments for roots, mark accessible memory blocks as alive, |
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89 * and then to reclaim free space. This action may need to suspend all |
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90 * running threads for at least part of the collection process. |
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91 */ |
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92 static void collect() |
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93 { |
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94 gc_collect(); |
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95 } |
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96 |
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97 /** |
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98 * Indicates that the managed memory space be minimized by returning free |
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99 * physical memory to the operating system. The amount of free memory |
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100 * returned depends on the allocator design and on program behavior. |
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101 */ |
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102 static void minimize() |
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103 { |
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104 gc_minimize(); |
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105 } |
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106 |
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107 |
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108 /** |
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109 * Elements for a bit field representing memory block attributes. These |
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110 * are manipulated via the getAttr, setAttr, clrAttr functions. |
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111 */ |
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112 enum BlkAttr : uint |
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113 { |
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114 FINALIZE = 0b0000_0001, /// Finalize the data in this block on collect. |
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115 NO_SCAN = 0b0000_0010, /// Do not scan through this block on collect. |
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116 NO_MOVE = 0b0000_0100 /// Do not move this memory block on collect. |
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117 } |
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118 |
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119 |
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120 /** |
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121 * Contains aggregate information about a block of managed memory. The |
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122 * purpose of this struct is to support a more efficient query style in |
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123 * instances where detailed information is needed. |
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124 * |
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125 * base = A pointer to the base of the block in question. |
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126 * size = The size of the block, calculated from base. |
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127 * attr = Attribute bits set on the memory block. |
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128 */ |
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129 alias BlkInfo_ BlkInfo; |
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130 |
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131 |
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132 /** |
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133 * Returns a bit field representing all block attributes set for the memory |
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134 * referenced by p. If p references memory not originally allocated by |
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135 * this garbage collector, points to the interior of a memory block, or if |
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136 * p is null, zero will be returned. |
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137 * |
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138 * Params: |
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139 * p = A pointer to the root of a valid memory block or to null. |
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140 * |
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141 * Returns: |
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142 * A bit field containing any bits set for the memory block referenced by |
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143 * p or zero on error. |
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144 */ |
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145 static uint getAttr( void* p ) |
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146 { |
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147 return gc_getAttr( p ); |
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148 } |
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149 |
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150 |
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151 /** |
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152 * Sets the specified bits for the memory references by p. If p references |
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153 * memory not originally allocated by this garbage collector, points to the |
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154 * interior of a memory block, or if p is null, no action will be |
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155 * performed. |
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156 * |
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157 * Params: |
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158 * p = A pointer to the root of a valid memory block or to null. |
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159 * a = A bit field containing any bits to set for this memory block. |
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160 * |
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161 * The result of a call to getAttr after the specified bits have been |
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162 * set. |
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163 */ |
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164 static uint setAttr( void* p, uint a ) |
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165 { |
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166 return gc_setAttr( p, a ); |
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167 } |
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168 |
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169 |
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170 /** |
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171 * Clears the specified bits for the memory references by p. If p |
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172 * references memory not originally allocated by this garbage collector, |
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173 * points to the interior of a memory block, or if p is null, no action |
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174 * will be performed. |
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175 * |
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176 * Params: |
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177 * p = A pointer to the root of a valid memory block or to null. |
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178 * a = A bit field containing any bits to clear for this memory block. |
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179 * |
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180 * Returns: |
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181 * The result of a call to getAttr after the specified bits have been |
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182 * cleared. |
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183 */ |
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184 static uint clrAttr( void* p, uint a ) |
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185 { |
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186 return gc_clrAttr( p, a ); |
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187 } |
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188 |
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189 |
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190 /** |
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191 * Requests an aligned block of managed memory from the garbage collector. |
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192 * This memory may be deleted at will with a call to free, or it may be |
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193 * discarded and cleaned up automatically during a collection run. If |
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194 * allocation fails, this function will call onOutOfMemory which is |
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195 * expected to throw an OutOfMemoryException. |
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196 * |
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197 * Params: |
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198 * sz = The desired allocation size in bytes. |
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199 * ba = A bitmask of the attributes to set on this block. |
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200 * |
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201 * Returns: |
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202 * A reference to the allocated memory or null if insufficient memory |
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203 * is available. |
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204 * |
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205 * Throws: |
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206 * OutOfMemoryException on allocation failure. |
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207 */ |
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208 static void* malloc( size_t sz, uint ba = 0 ) |
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209 { |
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210 return gc_malloc( sz, ba ); |
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211 } |
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212 |
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213 |
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214 /** |
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215 * Requests an aligned block of managed memory from the garbage collector, |
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216 * which is initialized with all bits set to zero. This memory may be |
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217 * deleted at will with a call to free, or it may be discarded and cleaned |
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218 * up automatically during a collection run. If allocation fails, this |
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219 * function will call onOutOfMemory which is expected to throw an |
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220 * OutOfMemoryException. |
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221 * |
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222 * Params: |
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223 * sz = The desired allocation size in bytes. |
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224 * ba = A bitmask of the attributes to set on this block. |
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225 * |
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226 * Returns: |
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227 * A reference to the allocated memory or null if insufficient memory |
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228 * is available. |
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229 * |
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230 * Throws: |
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231 * OutOfMemoryException on allocation failure. |
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232 */ |
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233 static void* calloc( size_t sz, uint ba = 0 ) |
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234 { |
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235 return gc_calloc( sz, ba ); |
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236 } |
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237 |
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238 |
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239 /** |
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240 * If sz is zero, the memory referenced by p will be deallocated as if |
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241 * by a call to free. A new memory block of size sz will then be |
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242 * allocated as if by a call to malloc, or the implementation may instead |
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243 * resize the memory block in place. The contents of the new memory block |
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244 * will be the same as the contents of the old memory block, up to the |
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245 * lesser of the new and old sizes. Note that existing memory will only |
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246 * be freed by realloc if sz is equal to zero. The garbage collector is |
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247 * otherwise expected to later reclaim the memory block if it is unused. |
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248 * If allocation fails, this function will call onOutOfMemory which is |
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249 * expected to throw an OutOfMemoryException. If p references memory not |
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250 * originally allocated by this garbage collector, or if it points to the |
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251 * interior of a memory block, no action will be taken. If ba is zero |
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252 * (the default) and p references the head of a valid, known memory block |
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253 * then any bits set on the current block will be set on the new block if a |
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254 * reallocation is required. If ba is not zero and p references the head |
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255 * of a valid, known memory block then the bits in ba will replace those on |
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256 * the current memory block and will also be set on the new block if a |
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257 * reallocation is required. |
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258 * |
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259 * Params: |
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260 * p = A pointer to the root of a valid memory block or to null. |
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261 * sz = The desired allocation size in bytes. |
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262 * ba = A bitmask of the attributes to set on this block. |
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263 * |
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264 * Returns: |
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265 * A reference to the allocated memory on success or null if sz is |
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266 * zero. On failure, the original value of p is returned. |
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267 * |
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268 * Throws: |
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269 * OutOfMemoryException on allocation failure. |
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270 */ |
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271 static void* realloc( void* p, size_t sz, uint ba = 0 ) |
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272 { |
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273 return gc_realloc( p, sz, ba ); |
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274 } |
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275 |
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276 |
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277 /** |
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278 * Requests that the managed memory block referenced by p be extended in |
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279 * place by at least mx bytes, with a desired extension of sz bytes. If an |
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280 * extension of the required size is not possible, if p references memory |
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281 * not originally allocated by this garbage collector, or if p points to |
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282 * the interior of a memory block, no action will be taken. |
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283 * |
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284 * Params: |
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285 * mx = The minimum extension size in bytes. |
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286 * sz = The desired extension size in bytes. |
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287 * |
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288 * Returns: |
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289 * The size in bytes of the extended memory block referenced by p or zero |
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290 * if no extension occurred. |
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291 */ |
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292 static size_t extend( void* p, size_t mx, size_t sz ) |
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293 { |
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294 return gc_extend( p, mx, sz ); |
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295 } |
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296 |
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297 |
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298 /** |
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299 * Requests that at least sz bytes of memory be obtained from the operating |
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300 * system and marked as free. |
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301 * |
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302 * Params: |
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303 * sz = The desired size in bytes. |
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304 * |
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305 * Returns: |
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306 * The actual number of bytes reserved or zero on error. |
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307 */ |
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308 static size_t reserve( size_t sz ) |
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309 { |
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310 return gc_reserve( sz ); |
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311 } |
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312 |
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313 |
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314 /** |
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315 * Deallocates the memory referenced by p. If p is null, no action |
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316 * occurs. If p references memory not originally allocated by this |
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317 * garbage collector, or if it points to the interior of a memory block, |
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318 * no action will be taken. The block will not be finalized regardless |
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319 * of whether the FINALIZE attribute is set. If finalization is desired, |
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320 * use delete instead. |
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321 * |
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322 * Params: |
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323 * p = A pointer to the root of a valid memory block or to null. |
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324 */ |
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325 static void free( void* p ) |
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326 { |
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327 gc_free( p ); |
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328 } |
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329 |
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330 |
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331 /** |
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332 * Returns the base address of the memory block containing p. This value |
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333 * is useful to determine whether p is an interior pointer, and the result |
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334 * may be passed to routines such as sizeOf which may otherwise fail. If p |
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335 * references memory not originally allocated by this garbage collector, if |
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336 * p is null, or if the garbage collector does not support this operation, |
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337 * null will be returned. |
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338 * |
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339 * Params: |
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340 * p = A pointer to the root or the interior of a valid memory block or to |
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341 * null. |
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342 * |
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343 * Returns: |
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344 * The base address of the memory block referenced by p or null on error. |
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345 */ |
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346 static void* addrOf( void* p ) |
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347 { |
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348 return gc_addrOf( p ); |
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349 } |
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350 |
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351 |
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352 /** |
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353 * Returns the true size of the memory block referenced by p. This value |
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354 * represents the maximum number of bytes for which a call to realloc may |
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355 * resize the existing block in place. If p references memory not |
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356 * originally allocated by this garbage collector, points to the interior |
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357 * of a memory block, or if p is null, zero will be returned. |
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358 * |
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359 * Params: |
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360 * p = A pointer to the root of a valid memory block or to null. |
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361 * |
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362 * Returns: |
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363 * The size in bytes of the memory block referenced by p or zero on error. |
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364 */ |
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365 static size_t sizeOf( void* p ) |
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366 { |
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367 return gc_sizeOf( p ); |
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368 } |
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369 |
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370 |
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371 /** |
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372 * Returns aggregate information about the memory block containing p. If p |
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373 * references memory not originally allocated by this garbage collector, if |
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374 * p is null, or if the garbage collector does not support this operation, |
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375 * BlkInfo.init will be returned. Typically, support for this operation |
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376 * is dependent on support for addrOf. |
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|
377 * |
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378 * Params: |
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379 * p = A pointer to the root or the interior of a valid memory block or to |
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parents:
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380 * null. |
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381 * |
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382 * Returns: |
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383 * Information regarding the memory block referenced by p or BlkInfo.init |
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384 * on error. |
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385 */ |
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386 static BlkInfo query( void* p ) |
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387 { |
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388 return gc_query( p ); |
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389 } |
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390 |
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391 |
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392 /** |
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393 * Adds the memory address referenced by p to an internal list of roots to |
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Added copy of druntime from DMD 2.020 modified for LDC.
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394 * be scanned during a collection. If p is null, no operation is |
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395 * performed. |
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396 * |
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397 * Params: |
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398 * p = A pointer to a valid memory address or to null. |
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parents:
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|
399 */ |
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400 static void addRoot( void* p ) |
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401 { |
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402 gc_addRoot( p ); |
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403 } |
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|
404 |
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405 |
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|
406 /** |
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407 * Adds the memory block referenced by p and of size sz to an internal list |
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408 * of ranges to be scanned during a collection. If p is null, no operation |
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409 * is performed. |
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410 * |
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411 * Params: |
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412 * p = A pointer to a valid memory address or to null. |
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|
413 * sz = The size in bytes of the block to add. If sz is zero then the |
d3eb054172f9
Added copy of druntime from DMD 2.020 modified for LDC.
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414 * no operation will occur. If p is null then sz must be zero. |
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|
415 */ |
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416 static void addRange( void* p, size_t sz ) |
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417 { |
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418 gc_addRange( p, sz ); |
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419 } |
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420 |
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421 |
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422 /** |
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423 * Removes the memory block referenced by p from an internal list of roots |
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424 * to be scanned during a collection. If p is null or does not represent |
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Added copy of druntime from DMD 2.020 modified for LDC.
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425 * a value previously passed to add(void*) then no operation is performed. |
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|
426 * |
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427 * p = A pointer to a valid memory address or to null. |
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|
428 */ |
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429 static void removeRoot( void* p ) |
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430 { |
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431 gc_removeRoot( p ); |
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432 } |
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433 |
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434 |
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435 /** |
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diff
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436 * Removes the memory block referenced by p from an internal list of ranges |
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parents:
diff
changeset
|
437 * to be scanned during a collection. If p is null or does not represent |
d3eb054172f9
Added copy of druntime from DMD 2.020 modified for LDC.
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parents:
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438 * a value previously passed to add(void*, size_t) then no operation is |
d3eb054172f9
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parents:
diff
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|
439 * performed. |
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changeset
|
440 * |
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parents:
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changeset
|
441 * Params: |
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442 * p = A pointer to a valid memory address or to null. |
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parents:
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|
443 */ |
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444 static void removeRange( void* p ) |
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445 { |
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446 gc_removeRange( p ); |
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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447 } |
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448 |
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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449 /** |
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450 * Get handle to the collector. |
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parents:
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451 * The only thing that can be done with this handle is pass it to |
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452 * setHandle(). getHandle/setHandle/endHandle work together so that |
d3eb054172f9
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parents:
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453 * if there are multiple instances of the gc running, only one instance |
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454 * can be set to run. |
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455 * The most common case of this is under Windows where a D application |
d3eb054172f9
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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456 * calls functions in a DLL that is implemented in D. |
d3eb054172f9
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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457 */ |
d3eb054172f9
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458 |
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459 static void* getHandle() |
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460 { |
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461 return gc_getHandle(); |
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462 } |
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463 |
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464 /** |
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465 * Set handle to the collector. |
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466 * The handle p is an opaque handle, acquired by a call to |
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467 * getHandle(). |
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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468 */ |
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469 |
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470 static void setHandle(void* p) |
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471 { |
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472 gc_setHandle(p); |
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473 } |
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474 |
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475 /** |
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476 * Call when done using the collector specified by the |
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477 * call to setHandle(). |
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478 */ |
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479 |
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480 static void endHandle() |
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481 { |
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482 gc_endHandle(); |
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483 } |
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484 } |