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annotate druntime/src/compiler/dmd/arrayassign.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 * Part of the D programming language runtime library.
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3 * http://www.digitalmars.com
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4 * Written by Walter Bright
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5 * Placed in the Public Domain
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6 */
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7 module rt.arrayassign;
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8
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9 private
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10 {
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11 import util.string;
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12 import stdc.string;
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13 import stdc.stdlib;
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14 debug(PRINTF) import stdc.stdio;
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15 }
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16
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17 /**
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18 * Does array assignment (not construction) from another
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19 * array of the same element type.
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20 * ti is the element type.
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21 * Handles overlapping copies.
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22 */
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23 extern (C) void[] _d_arrayassign(TypeInfo ti, void[] from, void[] to)
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24 {
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25 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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26
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27 if (to.length != from.length)
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28 {
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29 char[10] tmp = void;
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30 string msg = "lengths don't match for array copy,"c;
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31 msg ~= tmp.intToString(to.length) ~ " = " ~ tmp.intToString(from.length);
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32 throw new Exception(msg);
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33 }
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34
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35 auto element_size = ti.tsize();
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36
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37 /* Need a temporary buffer tmp[] big enough to hold one element
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38 */
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39 void[16] buf = void;
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40 void[] tmp;
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41 if (element_size > buf.sizeof)
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42 tmp = alloca(element_size)[0 .. element_size];
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43 else
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44 tmp = buf;
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45
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46
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47 if (to.ptr <= from.ptr)
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48 {
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49 foreach (i; 0 .. to.length)
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50 {
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51 void* pto = to.ptr + i * element_size;
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52 void* pfrom = from.ptr + i * element_size;
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53 memcpy(tmp.ptr, pto, element_size);
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54 memcpy(pto, pfrom, element_size);
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55 ti.postblit(pto);
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56 ti.destroy(tmp.ptr);
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57 }
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58 }
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59 else
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60 {
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61 for (int i = to.length; i--; )
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62 {
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63 void* pto = to.ptr + i * element_size;
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64 void* pfrom = from.ptr + i * element_size;
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65 memcpy(tmp.ptr, pto, element_size);
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66 memcpy(pto, pfrom, element_size);
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67 ti.postblit(pto);
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68 ti.destroy(tmp.ptr);
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69 }
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70 }
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71 return to;
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72 }
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73
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74 /**
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75 * Does array initialization (not assignment) from another
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76 * array of the same element type.
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77 * ti is the element type.
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78 */
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79 extern (C) void[] _d_arrayctor(TypeInfo ti, void[] from, void[] to)
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80 {
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81 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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82
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83 if (to.length != from.length)
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84 {
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85 char[10] tmp = void;
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86 string msg = "lengths don't match for array initialization,"c;
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87 msg ~= tmp.intToString(to.length) ~ " = " ~ tmp.intToString(from.length);
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88 throw new Exception(msg);
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89 }
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90
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91 auto element_size = ti.tsize();
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92
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93 int i;
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94 try
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95 {
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96 for (i = 0; i < to.length; i++)
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97 {
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98 // Copy construction is defined as bit copy followed by postblit.
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99 memcpy(to.ptr + i * element_size, from.ptr + i * element_size, element_size);
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100 ti.postblit(to.ptr + i * element_size);
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101 }
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102 }
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103 catch (Object o)
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104 {
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105 /* Destroy, in reverse order, what we've constructed so far
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106 */
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107 while (i--)
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108 {
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109 ti.destroy(to.ptr + i * element_size);
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110 }
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111
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112 throw o;
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113 }
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114 return to;
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115 }
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116
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117
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118 /**
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119 * Do assignment to an array.
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120 * p[0 .. count] = value;
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121 */
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122 extern (C) void* _d_arraysetassign(void* p, void* value, int count, TypeInfo ti)
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123 {
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124 void* pstart = p;
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125
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126 auto element_size = ti.tsize();
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127
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128 //Need a temporary buffer tmp[] big enough to hold one element
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129 void[16] buf = void;
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130 void[] tmp;
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131 if (element_size > buf.sizeof)
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132 {
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133 tmp = alloca(element_size)[0 .. element_size];
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134 }
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135 else
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136 tmp = buf;
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137
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138 foreach (i; 0 .. count)
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139 {
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140 memcpy(tmp.ptr, p, element_size);
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141 memcpy(p, value, element_size);
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142 ti.postblit(p);
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143 ti.destroy(tmp.ptr);
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144 p += element_size;
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145 }
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146 return pstart;
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147 }
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148
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149 /**
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150 * Do construction of an array.
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151 * ti[count] p = value;
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152 */
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153 extern (C) void* _d_arraysetctor(void* p, void* value, int count, TypeInfo ti)
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154 {
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155 void* pstart = p;
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156 auto element_size = ti.tsize();
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157
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158 try
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159 {
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160 foreach (i; 0 .. count)
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161 {
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162 // Copy construction is defined as bit copy followed by postblit.
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163 memcpy(p, value, element_size);
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164 ti.postblit(p);
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165 p += element_size;
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166 }
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167 }
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168 catch (Object o)
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169 {
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170 // Destroy, in reverse order, what we've constructed so far
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171 while (p > pstart)
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172 {
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173 p -= element_size;
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174 ti.destroy(p);
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175 }
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176
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177 throw o;
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178 }
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179 return pstart;
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180 }