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annotate druntime/src/compiler/dmd/memory.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 exposes functionality for inspecting and manipulating memory.
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3 *
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4 * Copyright: Copyright (C) 2005-2006 Digital Mars, www.digitalmars.com.
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5 * All rights reserved.
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6 * License:
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7 * This software is provided 'as-is', without any express or implied
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8 * warranty. In no event will the authors be held liable for any damages
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9 * arising from the use of this software.
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10 *
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11 * Permission is granted to anyone to use this software for any purpose,
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12 * including commercial applications, and to alter it and redistribute it
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13 * freely, in both source and binary form, subject to the following
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14 * restrictions:
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15 *
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16 * o The origin of this software must not be misrepresented; you must not
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17 * claim that you wrote the original software. If you use this software
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18 * in a product, an acknowledgment in the product documentation would be
d3eb054172f9 Added copy of druntime from DMD 2.020 modified for LDC.
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19 * appreciated but is not required.
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20 * o Altered source versions must be plainly marked as such, and must not
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21 * be misrepresented as being the original software.
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22 * o This notice may not be removed or altered from any source
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23 * distribution.
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24 * Authors: Walter Bright, Sean Kelly
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25 */
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26 module rt.memory;
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27
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28
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29 private
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30 {
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31 version( linux )
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32 {
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33 version = SimpleLibcStackEnd;
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34
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35 version( SimpleLibcStackEnd )
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36 {
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37 extern (C) extern void* __libc_stack_end;
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38 }
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39 }
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40 }
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41
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42
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43 /**
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44 *
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45 */
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46 extern (C) void* rt_stackBottom()
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47 {
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48 version( Windows )
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49 {
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50 asm
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51 {
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52 naked;
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53 mov EAX,FS:4;
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54 ret;
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55 }
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56 }
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57 else version( linux )
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58 {
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59 version( SimpleLibcStackEnd )
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60 {
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61 return __libc_stack_end;
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62 }
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63 else
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64 {
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65 // See discussion: http://autopackage.org/forums/viewtopic.php?t=22
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66 static void** libc_stack_end;
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67
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68 if( libc_stack_end == libc_stack_end.init )
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69 {
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70 void* handle = dlopen( null, RTLD_NOW );
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71 libc_stack_end = cast(void**) dlsym( handle, "__libc_stack_end" );
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72 dlclose( handle );
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73 }
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74 return *libc_stack_end;
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75 }
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76 }
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77 else
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78 {
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79 static assert( false, "Operating system not supported." );
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80 }
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81 }
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82
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83
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84 /**
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85 *
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86 */
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87 extern (C) void* rt_stackTop()
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88 {
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89 version( D_InlineAsm_X86 )
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90 {
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91 asm
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92 {
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93 naked;
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94 mov EAX, ESP;
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95 ret;
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96 }
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97 }
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98 else
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99 {
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100 static assert( false, "Architecture not supported." );
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101 }
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102 }
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103
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104
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105 private
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106 {
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107 version( Windows )
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108 {
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109 extern (C)
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110 {
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111 extern int _xi_a; // &_xi_a just happens to be start of data segment
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112 extern int _edata; // &_edata is start of BSS segment
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113 extern int _end; // &_end is past end of BSS
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114 }
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115 }
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116 else version( linux )
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117 {
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118 extern (C)
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119 {
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120 extern int _data;
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121 extern int __data_start;
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122 extern int _end;
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123 extern int _data_start__;
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124 extern int _data_end__;
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125 extern int _bss_start__;
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126 extern int _bss_end__;
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127 extern int __fini_array_end;
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128 }
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129
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130 alias __data_start Data_Start;
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131 alias _end Data_End;
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132 }
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133
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134 alias void delegate( void*, void* ) scanFn;
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135 }
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136
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137
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138 /**
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139 *
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140 */
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141 extern (C) void rt_scanStaticData( scanFn scan )
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142 {
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143 scan(rt_staticDataBottom(), rt_staticDataTop());
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144 }
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145
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146 /**
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147 *
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148 */
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149 extern (C) void* rt_staticDataBottom()
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150 {
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151 version( Windows )
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152 {
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153 return &_xi_a;
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154 }
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155 else version( linux )
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156 {
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157 return &__data_start;
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158 }
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159 else
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160 {
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161 static assert( false, "Operating system not supported." );
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162 }
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163 }
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164
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165 /**
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166 *
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167 */
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168 extern (C) void* rt_staticDataTop()
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169 {
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170 version( Windows )
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171 {
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172 return &_end;
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173 }
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174 else version( linux )
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175 {
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176 return &_end;
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177 }
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178 else
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179 {
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180 static assert( false, "Operating system not supported." );
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181 }
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182 }
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183
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184