Mercurial > projects > ldc
annotate runtime/internal/memory.d @ 829:0a31c60a6bc1
.. and fixed the install target (hopefully)
author | elrood |
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date | Fri, 05 Dec 2008 22:01:50 +0100 |
parents | 661384d6a936 |
children | aa953cc960b6 |
rev | line source |
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443
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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 |
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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 memory; |
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27 |
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28 version = GC_Use_Dynamic_Ranges; |
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29 |
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30 // does Posix suffice? |
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31 version(Posix) |
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32 { |
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33 version = GC_Use_Data_Proc_Maps; |
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34 } |
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35 |
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36 version(GC_Use_Data_Proc_Maps) |
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37 { |
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38 version(Posix) {} else { |
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39 static assert(false, "Proc Maps only supported on Posix systems"); |
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40 } |
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41 private import tango.stdc.posix.unistd; |
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42 private import tango.stdc.posix.fcntl; |
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43 private import tango.stdc.string; |
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44 |
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45 version = GC_Use_Dynamic_Ranges; |
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46 } |
443
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47 |
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48 private |
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49 { |
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50 version( linux ) |
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51 { |
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52 //version = SimpleLibcStackEnd; |
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53 |
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54 version( SimpleLibcStackEnd ) |
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55 { |
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56 extern (C) extern void* __libc_stack_end; |
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57 } |
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58 else |
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59 { |
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60 import tango.stdc.posix.dlfcn; |
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61 } |
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62 } |
664
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63 version(LDC) |
443
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64 { |
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65 pragma(intrinsic, "llvm.frameaddress") |
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66 { |
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67 void* llvm_frameaddress(uint level=0); |
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68 } |
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69 } |
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70 } |
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71 |
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72 |
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73 /** |
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74 * |
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75 */ |
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76 extern (C) void* rt_stackBottom() |
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77 { |
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78 version( Win32 ) |
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79 { |
578
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80 void* bottom; |
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81 asm |
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82 { |
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83 mov EAX, FS:4; |
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84 mov bottom, EAX; |
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85 } |
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86 return bottom; |
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87 } |
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88 else version( linux ) |
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89 { |
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90 version( SimpleLibcStackEnd ) |
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91 { |
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92 return __libc_stack_end; |
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93 } |
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94 else |
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95 { |
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96 // See discussion: http://autopackage.org/forums/viewtopic.php?t=22 |
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97 static void** libc_stack_end; |
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98 |
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99 if( libc_stack_end == libc_stack_end.init ) |
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100 { |
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101 void* handle = dlopen( null, RTLD_NOW ); |
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102 libc_stack_end = cast(void**) dlsym( handle, "__libc_stack_end" ); |
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103 dlclose( handle ); |
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104 } |
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105 return *libc_stack_end; |
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106 } |
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107 } |
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108 else version( darwin ) |
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109 { |
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110 // darwin has a fixed stack bottom |
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111 return cast(void*) 0xc0000000; |
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112 } |
443
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113 else |
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114 { |
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115 static assert( false, "Operating system not supported." ); |
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116 } |
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117 } |
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118 |
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119 |
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120 /** |
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121 * |
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122 */ |
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123 extern (C) void* rt_stackTop() |
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124 { |
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125 version(LDC) |
443
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126 { |
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127 return llvm_frameaddress(); |
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128 } |
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129 else version( D_InlineAsm_X86 ) |
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130 { |
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131 asm |
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132 { |
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133 naked; |
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134 mov EAX, ESP; |
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135 ret; |
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136 } |
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137 } |
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138 else |
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139 { |
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140 static assert( false, "Architecture not supported." ); |
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141 } |
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142 } |
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143 |
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144 |
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145 private |
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146 { |
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147 version( Win32 ) |
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148 { |
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149 extern (C) |
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150 { |
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151 extern int _data_start__; |
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152 extern int _bss_end__; |
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153 |
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154 alias _data_start__ Data_Start; |
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155 alias _bss_end__ Data_End; |
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156 } |
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157 } |
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158 else version( linux ) |
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159 { |
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160 extern (C) |
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161 { |
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162 extern int _data; |
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163 extern int __data_start; |
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164 extern int _end; |
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165 extern int _data_start__; |
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166 extern int _data_end__; |
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167 extern int _bss_start__; |
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168 extern int _bss_end__; |
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169 extern int __fini_array_end; |
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170 } |
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171 |
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172 alias __data_start Data_Start; |
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173 alias _end Data_End; |
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174 } |
577
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175 |
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176 version( GC_Use_Dynamic_Ranges ) |
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177 { |
577
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178 private import tango.stdc.stdlib; |
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179 |
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180 struct DataSeg |
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181 { |
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182 void* beg; |
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183 void* end; |
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184 } |
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185 |
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186 DataSeg* allSegs = null; |
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187 size_t numSegs = 0; |
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188 |
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189 extern (C) void _d_gc_add_range( void* beg, void* end ) |
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190 { |
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191 void* ptr = realloc( allSegs, (numSegs + 1) * DataSeg.sizeof ); |
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192 |
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193 if( ptr ) // if realloc fails, we have problems |
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194 { |
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195 allSegs = cast(DataSeg*) ptr; |
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196 allSegs[numSegs].beg = beg; |
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197 allSegs[numSegs].end = end; |
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198 numSegs++; |
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199 } |
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200 } |
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201 |
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202 extern (C) void _d_gc_remove_range( void* beg ) |
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203 { |
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204 for( size_t pos = 0; pos < numSegs; ++pos ) |
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205 { |
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206 if( beg == allSegs[pos].beg ) |
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207 { |
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208 while( ++pos < numSegs ) |
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209 { |
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210 allSegs[pos-1] = allSegs[pos]; |
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211 } |
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212 numSegs--; |
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213 return; |
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214 } |
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215 } |
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216 } |
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217 } |
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218 |
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219 alias void delegate( void*, void* ) scanFn; |
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220 |
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221 void* dataStart, dataEnd; |
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222 } |
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223 |
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224 |
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225 /** |
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226 * |
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227 */ |
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228 extern (C) void rt_scanStaticData( scanFn scan ) |
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229 { |
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230 scan( dataStart, dataEnd ); |
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231 |
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232 version( GC_Use_Dynamic_Ranges ) |
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233 { |
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234 for( size_t pos = 0; pos < numSegs; ++pos ) |
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235 { |
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236 scan( allSegs[pos].beg, allSegs[pos].end ); |
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237 } |
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238 } |
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239 } |
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240 |
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241 void initStaticDataPtrs() |
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242 { |
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243 const int S = (void*).sizeof; |
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244 |
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245 // Can't assume the input addresses are word-aligned |
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246 static void* adjust_up( void* p ) |
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247 { |
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248 return p + ((S - (cast(size_t)p & (S-1))) & (S-1)); // cast ok even if 64-bit |
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249 } |
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250 |
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251 static void * adjust_down( void* p ) |
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252 { |
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253 return p - (cast(size_t) p & (S-1)); |
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254 } |
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255 |
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256 version( Win32 ) |
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257 { |
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258 dataStart = adjust_up( &Data_Start ); |
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259 dataEnd = adjust_down( &Data_End ); |
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260 } |
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261 else version( GC_Use_Data_Proc_Maps ) |
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262 { |
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263 // TODO: Exclude zero-mapped regions |
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264 |
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265 int fd = open("/proc/self/maps", O_RDONLY); |
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266 ptrdiff_t count; // %% need to configure ret for read.. |
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267 char buf[2024]; |
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268 char* p; |
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269 char* e; |
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270 char* s; |
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271 void* start; |
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272 void* end; |
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273 |
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274 p = buf.ptr; |
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275 if (fd != -1) |
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276 { |
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277 while ( (count = read(fd, p, buf.sizeof - (p - buf.ptr))) > 0 ) |
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278 { |
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279 e = p + count; |
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280 p = buf.ptr; |
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281 while (true) |
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282 { |
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283 s = p; |
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284 while (p < e && *p != '\n') |
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285 p++; |
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286 if (p < e) |
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287 { |
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288 // parse the entry in [s, p) |
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289 static if( S == 4 ) |
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290 { |
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291 enum Ofs |
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292 { |
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293 Write_Prot = 19, |
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294 Start_Addr = 0, |
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295 End_Addr = 9, |
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296 Addr_Len = 8, |
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297 } |
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298 } |
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299 else static if( S == 8 ) |
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300 { |
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301 enum Ofs |
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302 { |
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303 Write_Prot = 35, |
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304 Start_Addr = 0, |
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305 End_Addr = 9, |
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306 Addr_Len = 17, |
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307 } |
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308 } |
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309 else |
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310 { |
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311 static assert( false ); |
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312 } |
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313 |
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314 // %% this is wrong for 64-bit: |
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315 // uint strtoul(char *,char **,int); |
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316 |
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317 if( s[Ofs.Write_Prot] == 'w' ) |
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318 { |
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319 s[Ofs.Start_Addr + Ofs.Addr_Len] = '\0'; |
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320 s[Ofs.End_Addr + Ofs.Addr_Len] = '\0'; |
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321 start = cast(void*) strtoul(s + Ofs.Start_Addr, null, 16); |
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322 end = cast(void*) strtoul(s + Ofs.End_Addr, null, 16); |
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323 |
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324 // 1. Exclude anything overlapping [dataStart, dataEnd) |
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325 // 2. Exclude stack |
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326 if ( ( !dataEnd || |
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327 !( dataStart >= start && dataEnd <= end ) ) && |
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328 !( &buf[0] >= start && &buf[0] < end ) ) |
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329 { |
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330 // we already have static data from this region. anything else |
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331 // is heap (%% check) |
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332 debug (ProcMaps) printf("Adding map range %p 0%p\n", start, end); |
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333 _d_gc_add_range(start, end); |
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334 } |
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335 } |
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336 p++; |
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337 } |
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338 else |
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339 { |
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340 count = p - s; |
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341 memmove(buf.ptr, s, cast(size_t)count); |
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342 p = buf.ptr + count; |
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343 break; |
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344 } |
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345 } |
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346 } |
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347 close(fd); |
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348 } |
443
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349 } |
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350 else version(linux) |
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351 { |
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352 dataStart = adjust_up( &Data_Start ); |
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353 dataEnd = adjust_down( &Data_End ); |
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354 } |
443
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355 else |
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356 { |
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357 static assert( false, "Operating system not supported." ); |
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358 } |
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359 } |