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annotate druntime/src/gc/stub/gc.d @ 759:d3eb054172f9

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Added copy of druntime from DMD 2.020 modified for LDC.
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Tue, 11 Nov 2008 01:52:37 +0100
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759
d3eb054172f9 Added copy of druntime from DMD 2.020 modified for LDC.
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1 /**
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2 * This module contains a minimal garbage collector implementation according to
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3 * published requirements. This library is mostly intended to serve as an
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4 * example, but it is usable in applications which do not rely on a garbage
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5 * collector to clean up memory (ie. when dynamic array resizing is not used,
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6 * and all memory allocated with 'new' is freed deterministically with
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7 * 'delete').
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8 *
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9 * Please note that block attribute data must be tracked, or at a minimum, the
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10 * FINALIZE bit must be tracked for any allocated memory block because calling
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11 * rt_finalize on a non-object block can result in an access violation. In the
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12 * allocator below, this tracking is done via a leading uint bitmask. A real
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13 * allocator may do better to store this data separately, similar to the basic
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14 * GC.
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15 *
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16 * Copyright: Public Domain
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17 * License: Public Domain
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18 * Authors: Sean Kelly
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19 */
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20
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21 module gc.gc;
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22
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23 private import stdc.stdlib;
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24
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25 private
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26 {
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27 enum BlkAttr : uint
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28 {
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29 FINALIZE = 0b0000_0001,
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30 NO_SCAN = 0b0000_0010,
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31 NO_MOVE = 0b0000_0100,
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32 ALL_BITS = 0b1111_1111
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33 }
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34
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35 struct BlkInfo
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36 {
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37 void* base;
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38 size_t size;
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39 uint attr;
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40 }
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41
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42 extern (C) void thread_init();
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43 extern (C) void onOutOfMemoryError();
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44 }
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45
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46 extern (C) void gc_init()
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47 {
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48 // NOTE: The GC must initialize the thread library before its first
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49 // collection, and always before returning from gc_init().
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50 thread_init();
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51 }
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52
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53 extern (C) void gc_term()
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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 extern (C) void gc_enable()
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59 {
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60
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61 }
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62
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63 extern (C) void gc_disable()
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64 {
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65
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66 }
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67
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68 extern (C) void gc_collect()
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69 {
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70
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71 }
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72
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73 extern (C) void gc_minimize()
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74 {
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75
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76 }
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77
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78 extern (C) uint gc_getAttr( void* p )
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79 {
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80 return 0;
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81 }
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82
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83 extern (C) uint gc_setAttr( void* p, uint a )
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84 {
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85 return 0;
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86 }
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87
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88 extern (C) uint gc_clrAttr( void* p, uint a )
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89 {
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90 return 0;
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91 }
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92
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93 extern (C) void* gc_malloc( size_t sz, uint ba = 0 )
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94 {
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95 void* p = malloc( sz );
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96
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97 if( sz && p is null )
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98 onOutOfMemoryError();
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99 return p;
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100 }
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101
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102 extern (C) void* gc_calloc( size_t sz, uint ba = 0 )
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103 {
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104 void* p = calloc( 1, sz );
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105
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106 if( sz && p is null )
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107 onOutOfMemoryError();
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108 return p;
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109 }
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110
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111 extern (C) void* gc_realloc( void* p, size_t sz, uint ba = 0 )
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112 {
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113 p = realloc( p, sz );
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114
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115 if( sz && p is null )
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116 onOutOfMemoryError();
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117 return p;
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118 }
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119
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120 extern (C) size_t gc_extend( void* p, size_t mx, size_t sz )
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121 {
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122 return 0;
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123 }
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124
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125 extern (C) size_t gc_reserve( size_t sz )
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126 {
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127 return 0;
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128 }
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129
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130 extern (C) void gc_free( void* p )
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131 {
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132 free( p );
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133 }
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134
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135 extern (C) void* gc_addrOf( void* p )
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136 {
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137 return null;
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138 }
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139
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140 extern (C) size_t gc_sizeOf( void* p )
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141 {
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142 return 0;
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143 }
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144
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145 extern (C) BlkInfo gc_query( void* p )
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146 {
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147 return BlkInfo.init;
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148 }
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149
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150 extern (C) void gc_addRoot( void* p )
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151 {
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152
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153 }
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154
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155 extern (C) void gc_addRange( void* p, size_t sz )
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156 {
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157
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158 }
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159
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160 extern (C) void gc_removeRoot( void *p )
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161 {
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162
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163 }
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164
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165 extern (C) void gc_removeRange( void *p )
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166 {
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167
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168 }
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169
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170 extern (C) void* gc_getHandle()
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171 {
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172 return null;
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173 }
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174
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175 extern (C) void gc_setHandle(void* p)
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176 {
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177 }
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178
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179 extern (C) void gc_endHandle()
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180 {
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181 }
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182