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annotate druntime/src/gc/basic/gcbits.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 * Contains a bitfield used by the GC.
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3 *
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4 * Copyright: Copyright Digital Mars 2005 - 2009.
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5 * License: <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>.
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6 * Authors: Walter Bright, David Friedman, Sean Kelly
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7 *
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8 * Copyright Digital Mars 2005 - 2009.
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9 * Distributed under the Boost Software License, Version 1.0.
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10 * (See accompanying file LICENSE_1_0.txt or copy at
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11 * http://www.boost.org/LICENSE_1_0.txt)
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12 */
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13 module gc.gcbits;
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14
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15
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16 private
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17 {
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18 import core.bitop;
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19 import core.stdc.string;
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20 import core.stdc.stdlib;
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21 extern (C) void onOutOfMemoryError();
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22 }
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23
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24
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25 version (DigitalMars)
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26 {
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27 version = bitops;
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28 }
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29 else version (GNU)
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30 {
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31 // use the unoptimized version
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32 }
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33 else version (D_InlineAsm_X86)
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34 {
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35 version = Asm86;
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36 }
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37
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38 struct GCBits
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39 {
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40 const int BITS_PER_WORD = 32;
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41 const int BITS_SHIFT = 5;
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42 const int BITS_MASK = 31;
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43
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44 uint* data = null;
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45 size_t nwords = 0; // allocated words in data[] excluding sentinals
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46 size_t nbits = 0; // number of bits in data[] excluding sentinals
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47
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48 void Dtor()
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49 {
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50 if (data)
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51 {
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52 free(data);
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53 data = null;
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54 }
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55 }
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56
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57 invariant()
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58 {
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59 if (data)
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60 {
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61 assert(nwords * data[0].sizeof * 8 >= nbits);
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62 }
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63 }
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64
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65 void alloc(size_t nbits)
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66 {
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67 this.nbits = nbits;
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68 nwords = (nbits + (BITS_PER_WORD - 1)) >> BITS_SHIFT;
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69 data = cast(uint*)calloc(nwords + 2, uint.sizeof);
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70 if (!data)
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71 onOutOfMemoryError();
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72 }
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73
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74 uint test(size_t i)
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75 in
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76 {
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77 assert(i < nbits);
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78 }
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79 body
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80 {
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81 //return (cast(bit *)(data + 1))[i];
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82 return data[1 + (i >> BITS_SHIFT)] & (1 << (i & BITS_MASK));
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83 }
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84
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85 void set(size_t i)
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86 in
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87 {
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88 assert(i < nbits);
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89 }
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90 body
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91 {
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92 //(cast(bit *)(data + 1))[i] = 1;
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93 data[1 + (i >> BITS_SHIFT)] |= (1 << (i & BITS_MASK));
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94 }
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95
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96 void clear(size_t i)
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97 in
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98 {
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99 assert(i < nbits);
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100 }
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101 body
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102 {
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103 //(cast(bit *)(data + 1))[i] = 0;
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104 data[1 + (i >> BITS_SHIFT)] &= ~(1 << (i & BITS_MASK));
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105 }
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106
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107 uint testClear(size_t i)
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108 {
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109 version (bitops)
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110 {
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111 return std.intrinsic.btr(data + 1, i);
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112 }
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113 else version (Asm86)
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114 {
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115 asm
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116 {
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117 naked ;
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118 mov EAX,data[EAX] ;
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119 mov ECX,i-4[ESP] ;
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120 btr 4[EAX],ECX ;
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121 sbb EAX,EAX ;
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122 ret 4 ;
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123 }
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124 }
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125 else
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126 { uint result;
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127
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128 //result = (cast(bit *)(data + 1))[i];
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129 //(cast(bit *)(data + 1))[i] = 0;
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130
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131 uint* p = &data[1 + (i >> BITS_SHIFT)];
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132 uint mask = (1 << (i & BITS_MASK));
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133 result = *p & mask;
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134 *p &= ~mask;
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135 return result;
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136 }
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137 }
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138
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139 void zero()
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140 {
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141 memset(data + 1, 0, nwords * uint.sizeof);
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142 }
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143
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144 void copy(GCBits *f)
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145 in
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146 {
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147 assert(nwords == f.nwords);
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148 }
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149 body
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150 {
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151 memcpy(data + 1, f.data + 1, nwords * uint.sizeof);
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152 }
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153
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154 uint* base()
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155 in
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156 {
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157 assert(data);
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158 }
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159 body
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160 {
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161 return data + 1;
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162 }
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163 }
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164
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165 unittest
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166 {
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167 GCBits b;
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168
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169 b.alloc(786);
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170 assert(b.test(123) == 0);
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171 assert(b.testClear(123) == 0);
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172 b.set(123);
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173 assert(b.test(123) != 0);
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174 assert(b.testClear(123) != 0);
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175 assert(b.test(123) == 0);
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176
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177 b.set(785);
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178 b.set(0);
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179 assert(b.test(785) != 0);
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180 assert(b.test(0) != 0);
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181 b.zero();
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182 assert(b.test(785) == 0);
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183 assert(b.test(0) == 0);
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184
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185 GCBits b2;
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186 b2.alloc(786);
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187 b2.set(38);
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188 b.copy(&b2);
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189 assert(b.test(38) != 0);
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190 b2.Dtor();
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191
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192 b.Dtor();
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193 }