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annotate runtime/internal/memory.d @ 650:aa6a0b7968f7

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Added test case for bug #100 Removed dubious check for not emitting static private global in other modules without access. This should be handled properly somewhere else, it's causing unresolved global errors for stuff that should work (in MiniD)
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Sun, 05 Oct 2008 17:28:15 +0200
parents 8caa9adce5ae
children eef8ac26c66c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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
577
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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 }
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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 }
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63 version(LLVMDC)
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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 {
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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(LLVMDC)
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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 }
558
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217 }
443
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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 {
577
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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
443
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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 int 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, 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 }
577
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350 else version(linux)
558
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351 {
577
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352 dataStart = adjust_up( &Data_Start );
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353 dataEnd = adjust_down( &Data_End );
558
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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 }