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annotate druntime/src/compiler/ldc/arrayassign.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 * Implementation of array assignment support routines.
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3 *
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4 * Copyright: Copyright Digital Mars 2000 - 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
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7 *
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8 * Copyright Digital Mars 2000 - 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 rt.arrayassign;
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14
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15 private
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16 {
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17 import rt.util.string;
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18 import core.stdc.string;
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19 import core.stdc.stdlib;
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20 debug(PRINTF) import core.stdc.stdio;
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21 }
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22
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23 /**
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24 * Does array assignment (not construction) from another
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25 * array of the same element type.
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26 * ti is the element type.
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27 * Handles overlapping copies.
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28 */
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29 extern (C) void[] _d_arrayassign(TypeInfo ti, void[] from, void[] to)
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30 {
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31 debug(PRINTF) printf("_d_arrayassign(from = %p,%d, to = %p,%d) size = %d\n", from.ptr, from.length, to.ptr, to.length, ti.tsize());
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32
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33 if (to.length != from.length)
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34 {
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35 char[10] tmp = void;
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36 string msg = "lengths don't match for array copy,"c;
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37 msg ~= tmp.intToString(to.length) ~ " = " ~ tmp.intToString(from.length);
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38 throw new Exception(msg);
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39 }
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40
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41 auto element_size = ti.tsize();
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42
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43 /* Need a temporary buffer tmp[] big enough to hold one element
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44 */
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45 void[16] buf = void;
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46 void[] tmp;
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47 if (element_size > buf.sizeof)
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48 tmp = alloca(element_size)[0 .. element_size];
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49 else
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50 tmp = buf;
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51
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52
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53 if (to.ptr <= from.ptr)
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54 {
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55 foreach (i; 0 .. to.length)
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56 {
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57 void* pto = to.ptr + i * element_size;
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58 void* pfrom = from.ptr + i * element_size;
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59 memcpy(tmp.ptr, pto, element_size);
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60 memcpy(pto, pfrom, element_size);
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61 ti.postblit(pto);
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62 ti.destroy(tmp.ptr);
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63 }
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64 }
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65 else
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66 {
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67 for (int i = to.length; i--; )
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68 {
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69 void* pto = to.ptr + i * element_size;
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70 void* pfrom = from.ptr + i * element_size;
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71 memcpy(tmp.ptr, pto, element_size);
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72 memcpy(pto, pfrom, element_size);
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73 ti.postblit(pto);
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74 ti.destroy(tmp.ptr);
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75 }
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76 }
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77 return to;
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78 }
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79
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80 /**
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81 * Does array initialization (not assignment) from another
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82 * array of the same element type.
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83 * ti is the element type.
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84 */
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85 extern (C) void[] _d_arrayctor(TypeInfo ti, void[] from, void[] to)
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86 {
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87 debug(PRINTF) printf("_d_arrayctor(from = %p,%d, to = %p,%d) size = %d\n", from.ptr, from.length, to.ptr, to.length, ti.tsize());
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88
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89 if (to.length != from.length)
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90 {
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91 char[10] tmp = void;
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92 string msg = "lengths don't match for array initialization,"c;
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93 msg ~= tmp.intToString(to.length) ~ " = " ~ tmp.intToString(from.length);
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94 throw new Exception(msg);
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95 }
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96
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97 auto element_size = ti.tsize();
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98
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99 int i;
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100 try
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101 {
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102 for (i = 0; i < to.length; i++)
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103 {
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104 // Copy construction is defined as bit copy followed by postblit.
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105 memcpy(to.ptr + i * element_size, from.ptr + i * element_size, element_size);
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106 ti.postblit(to.ptr + i * element_size);
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107 }
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108 }
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109 catch (Object o)
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110 {
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111 /* Destroy, in reverse order, what we've constructed so far
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112 */
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113 while (i--)
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114 {
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115 ti.destroy(to.ptr + i * element_size);
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116 }
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117
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118 throw o;
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119 }
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120 return to;
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121 }
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122
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123
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124 /**
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125 * Do assignment to an array.
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126 * p[0 .. count] = value;
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127 */
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128 extern (C) void* _d_arraysetassign(void* p, void* value, int count, TypeInfo ti)
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129 {
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130 void* pstart = p;
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131
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132 auto element_size = ti.tsize();
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133
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134 //Need a temporary buffer tmp[] big enough to hold one element
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135 void[16] buf = void;
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136 void[] tmp;
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137 if (element_size > buf.sizeof)
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138 {
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139 tmp = alloca(element_size)[0 .. element_size];
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140 }
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141 else
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142 tmp = buf;
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143
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144 foreach (i; 0 .. count)
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145 {
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146 memcpy(tmp.ptr, p, element_size);
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147 memcpy(p, value, element_size);
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148 ti.postblit(p);
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149 ti.destroy(tmp.ptr);
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150 p += element_size;
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151 }
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152 return pstart;
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153 }
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154
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155 /**
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156 * Do construction of an array.
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157 * ti[count] p = value;
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158 */
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159 extern (C) void* _d_arraysetctor(void* p, void* value, int count, TypeInfo ti)
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160 {
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161 void* pstart = p;
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162 auto element_size = ti.tsize();
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163
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164 try
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165 {
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166 foreach (i; 0 .. count)
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167 {
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168 // Copy construction is defined as bit copy followed by postblit.
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169 memcpy(p, value, element_size);
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170 ti.postblit(p);
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171 p += element_size;
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172 }
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173 }
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174 catch (Object o)
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175 {
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176 // Destroy, in reverse order, what we've constructed so far
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177 while (p > pstart)
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178 {
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179 p -= element_size;
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180 ti.destroy(p);
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181 }
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182
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183 throw o;
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184 }
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185 return pstart;
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186 }