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annotate druntime/src/gc/stub/gc.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 * 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: Copyright Sean Kelly 2005 - 2009.
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17 * License: <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>.
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18 * Authors: Sean Kelly
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19 *
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20 * Copyright Sean Kelly 2005 - 2009.
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21 * Distributed under the Boost Software License, Version 1.0.
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22 * (See accompanying file LICENSE_1_0.txt or copy at
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23 * http://www.boost.org/LICENSE_1_0.txt)
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24 */
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25 module gc.gc;
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26
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27 private
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28 {
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29 import core.stdc.stdlib;
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30
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31 enum BlkAttr : uint
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32 {
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33 FINALIZE = 0b0000_0001,
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34 NO_SCAN = 0b0000_0010,
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35 NO_MOVE = 0b0000_0100,
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36 ALL_BITS = 0b1111_1111
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37 }
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38
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39 struct BlkInfo
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40 {
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41 void* base;
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42 size_t size;
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43 uint attr;
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44 }
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45
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46 extern (C) void thread_init();
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47 extern (C) void onOutOfMemoryError();
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48
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49 struct Proxy
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50 {
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51 extern (C) void function() gc_enable;
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52 extern (C) void function() gc_disable;
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53 extern (C) void function() gc_collect;
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54 extern (C) void function() gc_minimize;
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55
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56 extern (C) uint function(void*) gc_getAttr;
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57 extern (C) uint function(void*, uint) gc_setAttr;
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58 extern (C) uint function(void*, uint) gc_clrAttr;
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59
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60 extern (C) void* function(size_t, uint) gc_malloc;
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61 extern (C) void* function(size_t, uint) gc_calloc;
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62 extern (C) void* function(void*, size_t, uint ba) gc_realloc;
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63 extern (C) size_t function(void*, size_t, size_t) gc_extend;
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64 extern (C) size_t function(size_t) gc_reserve;
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65 extern (C) void function(void*) gc_free;
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66
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67 extern (C) void* function(void*) gc_addrOf;
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68 extern (C) size_t function(void*) gc_sizeOf;
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69
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70 extern (C) BlkInfo function(void*) gc_query;
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71
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72 extern (C) void function(void*) gc_addRoot;
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73 extern (C) void function(void*, size_t) gc_addRange;
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74
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75 extern (C) void function(void*) gc_removeRoot;
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76 extern (C) void function(void*) gc_removeRange;
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77 }
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78
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79 __gshared Proxy pthis;
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80 __gshared Proxy* proxy;
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81
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82 void initProxy()
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83 {
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84 pthis.gc_enable = &gc_enable;
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85 pthis.gc_disable = &gc_disable;
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86 pthis.gc_collect = &gc_collect;
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87 pthis.gc_minimize = &gc_minimize;
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88
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89 pthis.gc_getAttr = &gc_getAttr;
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90 pthis.gc_setAttr = &gc_setAttr;
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91 pthis.gc_clrAttr = &gc_clrAttr;
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92
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93 pthis.gc_malloc = &gc_malloc;
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94 pthis.gc_calloc = &gc_calloc;
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95 pthis.gc_realloc = &gc_realloc;
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96 pthis.gc_extend = &gc_extend;
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97 pthis.gc_reserve = &gc_reserve;
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98 pthis.gc_free = &gc_free;
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99
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100 pthis.gc_addrOf = &gc_addrOf;
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101 pthis.gc_sizeOf = &gc_sizeOf;
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102
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103 pthis.gc_query = &gc_query;
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104
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105 pthis.gc_addRoot = &gc_addRoot;
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106 pthis.gc_addRange = &gc_addRange;
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107
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108 pthis.gc_removeRoot = &gc_removeRoot;
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109 pthis.gc_removeRange = &gc_removeRange;
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110 }
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111
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112 __gshared void** roots = null;
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113 __gshared size_t nroots = 0;
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114
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115 struct Range
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116 {
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117 void* pos;
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118 size_t len;
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119 }
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120
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121 __gshared Range* ranges = null;
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122 __gshared size_t nranges = 0;
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123 }
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124
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125 extern (C) void gc_init()
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126 {
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127 // NOTE: The GC must initialize the thread library before its first
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128 // collection, and always before returning from gc_init().
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129 thread_init();
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parents:
diff changeset
130 initProxy();
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
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131 }
e0b2d67cfe7c Added druntime (this should be removed once it works).
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diff changeset
132
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
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diff changeset
133 extern (C) void gc_term()
e0b2d67cfe7c Added druntime (this should be removed once it works).
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diff changeset
134 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
135 free( roots );
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
136 free( ranges );
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
137 }
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
138
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
139 extern (C) void gc_enable()
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
140 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
141 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
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142 return;
e0b2d67cfe7c Added druntime (this should be removed once it works).
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143 return proxy.gc_enable();
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
144 }
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diff changeset
145
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Robert Clipsham <robert@octarineparrot.com>
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diff changeset
146 extern (C) void gc_disable()
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
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diff changeset
147 {
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diff changeset
148 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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149 return;
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150 return proxy.gc_disable();
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
151 }
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152
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Robert Clipsham <robert@octarineparrot.com>
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diff changeset
153 extern (C) void gc_collect()
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
154 {
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Robert Clipsham <robert@octarineparrot.com>
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diff changeset
155 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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156 return;
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157 return proxy.gc_collect();
e0b2d67cfe7c Added druntime (this should be removed once it works).
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158 }
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159
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Robert Clipsham <robert@octarineparrot.com>
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diff changeset
160 extern (C) void gc_minimize()
e0b2d67cfe7c Added druntime (this should be removed once it works).
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161 {
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Robert Clipsham <robert@octarineparrot.com>
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diff changeset
162 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
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163 return;
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164 return proxy.gc_minimize();
e0b2d67cfe7c Added druntime (this should be removed once it works).
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165 }
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166
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167 extern (C) uint gc_getAttr( void* p )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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168 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
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169 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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170 return 0;
e0b2d67cfe7c Added druntime (this should be removed once it works).
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171 return proxy.gc_getAttr( p );
e0b2d67cfe7c Added druntime (this should be removed once it works).
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172 }
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173
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174 extern (C) uint gc_setAttr( void* p, uint a )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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175 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
176 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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177 return 0;
e0b2d67cfe7c Added druntime (this should be removed once it works).
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178 return proxy.gc_setAttr( p, a );
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179 }
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180
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diff changeset
181 extern (C) uint gc_clrAttr( void* p, uint a )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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182 {
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parents:
diff changeset
183 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
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184 return 0;
e0b2d67cfe7c Added druntime (this should be removed once it works).
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185 return proxy.gc_clrAttr( p, a );
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186 }
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187
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188 extern (C) void* gc_malloc( size_t sz, uint ba = 0 )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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189 {
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parents:
diff changeset
190 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
191 {
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192 void* p = malloc( sz );
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193
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
194 if( sz && p is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
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195 onOutOfMemoryError();
e0b2d67cfe7c Added druntime (this should be removed once it works).
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196 return p;
e0b2d67cfe7c Added druntime (this should be removed once it works).
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197 }
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198 return proxy.gc_malloc( sz, ba );
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199 }
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200
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201 extern (C) void* gc_calloc( size_t sz, uint ba = 0 )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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202 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
203 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
204 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
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diff changeset
205 void* p = calloc( 1, sz );
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206
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Robert Clipsham <robert@octarineparrot.com>
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diff changeset
207 if( sz && p is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
208 onOutOfMemoryError();
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
209 return p;
e0b2d67cfe7c Added druntime (this should be removed once it works).
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210 }
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
211 return proxy.gc_calloc( sz, ba );
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
212 }
e0b2d67cfe7c Added druntime (this should be removed once it works).
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213
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
214 extern (C) void* gc_realloc( void* p, size_t sz, uint ba = 0 )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
215 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
216 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
217 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
218 p = realloc( p, sz );
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
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219
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
220 if( sz && p is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
221 onOutOfMemoryError();
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
222 return p;
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
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223 }
e0b2d67cfe7c Added druntime (this should be removed once it works).
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224 return proxy.gc_realloc( p, sz, ba );
e0b2d67cfe7c Added druntime (this should be removed once it works).
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225 }
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226
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227 extern (C) size_t gc_extend( void* p, size_t mx, size_t sz )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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diff changeset
228 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
229 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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230 return 0;
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
231 return proxy.gc_extend( p, mx, sz );
e0b2d67cfe7c Added druntime (this should be removed once it works).
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diff changeset
232 }
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
233
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
234 extern (C) size_t gc_reserve( size_t sz )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
235 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
236 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
237 return 0;
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
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238 return proxy.gc_reserve( sz );
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
239 }
e0b2d67cfe7c Added druntime (this should be removed once it works).
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240
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
241 extern (C) void gc_free( void* p )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
242 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
243 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
244 return free( p );
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
245 return proxy.gc_free( p );
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
246 }
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
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247
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
248 extern (C) void* gc_addrOf( void* p )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
249 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
250 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
251 return null;
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
252 return proxy.gc_addrOf( p );
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
253 }
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
254
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
255 extern (C) size_t gc_sizeOf( void* p )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
256 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
257 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
258 return 0;
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
259 return proxy.gc_sizeOf( p );
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
260 }
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
261
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
262 extern (C) BlkInfo gc_query( void* p )
e0b2d67cfe7c Added druntime (this should be removed once it works).
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parents:
diff changeset
263 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
264 if( proxy is null )
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
diff changeset
265 return BlkInfo.init;
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
parents:
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266 return proxy.gc_query( p );
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267 }
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268
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269 extern (C) void gc_addRoot( void* p )
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270 {
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271 if( proxy is null )
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272 {
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273 void** r = cast(void**) realloc( roots,
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274 (nroots+1) * roots[0].sizeof );
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275 if( r is null )
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276 onOutOfMemoryError();
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277 r[nroots++] = p;
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278 roots = r;
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279
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280 }
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281 return proxy.gc_addRoot( p );
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282 }
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283
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284 extern (C) void gc_addRange( void* p, size_t sz )
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285 {
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286 if( proxy is null )
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287 {
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288 Range* r = cast(Range*) realloc( ranges,
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289 (nranges+1) * ranges[0].sizeof );
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290 if( r is null )
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291 onOutOfMemoryError();
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292 r[nranges].pos = p;
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293 r[nranges].len = sz;
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294 ranges = r;
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295 ++nranges;
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296 }
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297 return proxy.gc_addRange( p, sz );
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298 }
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299
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300 extern (C) void gc_removeRoot( void *p )
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301 {
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302 if( proxy is null )
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303 {
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304 for( size_t i = 0; i < nroots; ++i )
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305 {
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306 if( roots[i] is p )
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307 {
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308 roots[i] = roots[--nroots];
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309 return;
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310 }
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311 }
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312 assert( false );
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313 }
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314 return proxy.gc_removeRoot( p );
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315 }
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316
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317 extern (C) void gc_removeRange( void *p )
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318 {
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319 if( proxy is null )
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320 {
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321 for( size_t i = 0; i < nranges; ++i )
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322 {
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323 if( ranges[i].pos is p )
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324 {
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325 ranges[i] = ranges[--nranges];
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326 return;
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327 }
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328 }
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329 assert( false );
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330 }
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331 return proxy.gc_removeRange( p );
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332 }
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333
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334 extern (C) Proxy* gc_getProxy()
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335 {
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336 return &pthis;
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337 }
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338
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339 export extern (C) void gc_setProxy( Proxy* p )
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340 {
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341 if( proxy !is null )
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342 {
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343 // TODO: Decide if this is an error condition.
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344 }
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345 proxy = p;
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diff changeset
346 foreach( r; roots[0 .. nroots] )
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diff changeset
347 proxy.gc_addRoot( r );
e0b2d67cfe7c Added druntime (this should be removed once it works).
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diff changeset
348 foreach( r; ranges[0 .. nranges] )
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diff changeset
349 proxy.gc_addRange( r.pos, r.len );
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350 }
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351
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diff changeset
352 export extern (C) void gc_clrProxy()
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diff changeset
353 {
e0b2d67cfe7c Added druntime (this should be removed once it works).
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diff changeset
354 foreach( r; ranges[0 .. nranges] )
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diff changeset
355 proxy.gc_removeRange( r.pos );
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diff changeset
356 foreach( r; roots[0 .. nroots] )
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diff changeset
357 proxy.gc_removeRoot( r );
e0b2d67cfe7c Added druntime (this should be removed once it works).
Robert Clipsham <robert@octarineparrot.com>
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diff changeset
358 proxy = null;
e0b2d67cfe7c Added druntime (this should be removed once it works).
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diff changeset
359 }