Mercurial > projects > ldc
annotate runtime/internal/eh.d @ 984:4c0df37d0421
Removing ldc.conf. (IMPORTANT: run 'cmake .' after pull)
Added it to .hgignore.
This gets rid of spurious differences caused by CMake regenerating it differently.
Just run 'cmake .' to get it back in your local checkout.
author | Frits van Bommel <fvbommel wxs.nl> |
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date | Thu, 19 Feb 2009 13:50:05 +0100 |
parents | db3f8e7d79d2 |
children | 4a5eea0334e5 |
rev | line source |
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443
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1 /** |
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2 * This module contains functions and structures required for |
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3 * exception handling. |
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4 */ |
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5 module eh; |
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6 |
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7 import util.console; |
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8 import ldc.cstdarg; |
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9 |
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10 // debug = EH_personality; |
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11 |
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12 // current EH implementation works on x86 |
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13 // if it has a working unwind runtime |
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14 version(X86) { |
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15 version(linux) version=X86_UNWIND; |
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16 version(darwin) version=X86_UNWIND; |
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17 version(solaris) version=X86_UNWIND; |
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18 } |
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19 version(X86_64) { |
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20 version(linux) version=X86_UNWIND; |
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21 version(solaris) version=X86_UNWIND; |
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22 } |
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23 |
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24 //version = HP_LIBUNWIND; |
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25 |
443
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26 private extern(C) void abort(); |
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27 private extern(C) int printf(char*, ...); |
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28 private extern(C) int vprintf(char*, va_list va); |
443
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29 |
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30 // D runtime functions |
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31 extern(C) { |
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32 int _d_isbaseof(ClassInfo oc, ClassInfo c); |
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33 } |
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34 |
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35 // libunwind headers |
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36 extern(C) |
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37 { |
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38 enum _Unwind_Reason_Code |
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39 { |
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40 NO_REASON = 0, |
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41 FOREIGN_EXCEPTION_CAUGHT = 1, |
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42 FATAL_PHASE2_ERROR = 2, |
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43 FATAL_PHASE1_ERROR = 3, |
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44 NORMAL_STOP = 4, |
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45 END_OF_STACK = 5, |
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46 HANDLER_FOUND = 6, |
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47 INSTALL_CONTEXT = 7, |
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48 CONTINUE_UNWIND = 8 |
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49 } |
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50 |
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51 enum _Unwind_Action |
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52 { |
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53 SEARCH_PHASE = 1, |
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54 CLEANUP_PHASE = 2, |
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55 HANDLER_PHASE = 3, |
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56 FORCE_UNWIND = 4 |
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57 } |
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58 |
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59 alias void* _Unwind_Context_Ptr; |
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60 |
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61 alias void function(_Unwind_Reason_Code, _Unwind_Exception*) _Unwind_Exception_Cleanup_Fn; |
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62 |
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63 struct _Unwind_Exception |
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64 { |
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65 char[8] exception_class; |
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66 _Unwind_Exception_Cleanup_Fn exception_cleanup; |
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67 ptrdiff_t private_1; |
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68 ptrdiff_t private_2; |
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69 } |
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70 |
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71 // interface to HP's libunwind from http://www.nongnu.org/libunwind/ |
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72 version(HP_LIBUNWIND) |
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73 { |
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74 void __libunwind_Unwind_Resume(_Unwind_Exception *); |
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75 _Unwind_Reason_Code __libunwind_Unwind_RaiseException(_Unwind_Exception *); |
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76 ptrdiff_t __libunwind_Unwind_GetLanguageSpecificData(_Unwind_Context_Ptr |
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77 context); |
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78 ptrdiff_t __libunwind_Unwind_GetIP(_Unwind_Context_Ptr context); |
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79 ptrdiff_t __libunwind_Unwind_SetIP(_Unwind_Context_Ptr context, |
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80 ptrdiff_t new_value); |
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81 ptrdiff_t __libunwind_Unwind_SetGR(_Unwind_Context_Ptr context, int index, |
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82 ptrdiff_t new_value); |
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83 ptrdiff_t __libunwind_Unwind_GetRegionStart(_Unwind_Context_Ptr context); |
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84 |
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85 alias __libunwind_Unwind_Resume _Unwind_Resume; |
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86 alias __libunwind_Unwind_RaiseException _Unwind_RaiseException; |
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87 alias __libunwind_Unwind_GetLanguageSpecificData |
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88 _Unwind_GetLanguageSpecificData; |
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89 alias __libunwind_Unwind_GetIP _Unwind_GetIP; |
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90 alias __libunwind_Unwind_SetIP _Unwind_SetIP; |
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91 alias __libunwind_Unwind_SetGR _Unwind_SetGR; |
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92 alias __libunwind_Unwind_GetRegionStart _Unwind_GetRegionStart; |
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93 } |
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94 else version(X86_UNWIND) |
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95 { |
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96 void _Unwind_Resume(_Unwind_Exception*); |
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97 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception*); |
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98 ptrdiff_t _Unwind_GetLanguageSpecificData(_Unwind_Context_Ptr context); |
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99 ptrdiff_t _Unwind_GetIP(_Unwind_Context_Ptr context); |
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100 ptrdiff_t _Unwind_SetIP(_Unwind_Context_Ptr context, ptrdiff_t new_value); |
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101 ptrdiff_t _Unwind_SetGR(_Unwind_Context_Ptr context, int index, |
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102 ptrdiff_t new_value); |
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103 ptrdiff_t _Unwind_GetRegionStart(_Unwind_Context_Ptr context); |
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104 } |
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105 else |
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106 { |
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107 // runtime calls these directly |
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108 void _Unwind_Resume(_Unwind_Exception*) |
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109 { |
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110 console("_Unwind_Resume is not implemented on this platform.\n"); |
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111 } |
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112 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception*) |
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113 { |
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114 console("_Unwind_RaiseException is not implemented on this platform.\n"); |
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115 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
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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 // error and exit |
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122 extern(C) private void fatalerror(char* format, ...) |
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123 { |
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124 va_list args; |
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125 va_start(args, format); |
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126 printf("Fatal error in EH code: "); |
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127 vprintf(format, args); |
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128 printf("\n"); |
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129 abort(); |
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130 } |
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131 |
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132 |
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133 // helpers for reading certain DWARF data |
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134 private ubyte* get_uleb128(ubyte* addr, ref size_t res) |
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135 { |
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136 res = 0; |
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137 size_t bitsize = 0; |
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138 |
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139 // read as long as high bit is set |
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140 while(*addr & 0x80) { |
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141 res |= (*addr & 0x7f) << bitsize; |
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142 bitsize += 7; |
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143 addr += 1; |
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144 if(bitsize >= size_t.sizeof*8) |
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145 fatalerror("tried to read uleb128 that exceeded size of size_t"); |
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146 } |
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147 // read last |
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148 if(bitsize != 0 && *addr >= 1 << size_t.sizeof*8 - bitsize) |
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149 fatalerror("Fatal error in EH code: tried to read uleb128 that exceeded size of size_t"); |
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150 res |= (*addr) << bitsize; |
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151 |
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152 return addr + 1; |
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153 } |
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154 |
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155 private ubyte* get_sleb128(ubyte* addr, ref ptrdiff_t res) |
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156 { |
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157 res = 0; |
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158 size_t bitsize = 0; |
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159 |
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160 // read as long as high bit is set |
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161 while(*addr & 0x80) { |
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162 res |= (*addr & 0x7f) << bitsize; |
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163 bitsize += 7; |
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164 addr += 1; |
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165 if(bitsize >= size_t.sizeof*8) |
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166 fatalerror("tried to read sleb128 that exceeded size of size_t"); |
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167 } |
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168 // read last |
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169 if(bitsize != 0 && *addr >= 1 << size_t.sizeof*8 - bitsize) |
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170 fatalerror("tried to read sleb128 that exceeded size of size_t"); |
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171 res |= (*addr) << bitsize; |
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172 |
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173 // take care of sign |
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174 if(bitsize < size_t.sizeof*8 && ((*addr) & 0x40)) |
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175 res |= cast(ptrdiff_t)(-1) ^ ((1 << (bitsize+7)) - 1); |
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176 |
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177 return addr + 1; |
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178 } |
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179 |
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180 |
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181 // exception struct used by the runtime. |
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182 // _d_throw allocates a new instance and passes the address of its |
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183 // _Unwind_Exception member to the unwind call. The personality |
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184 // routine is then able to get the whole struct by looking at the data |
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185 // surrounding the unwind info. |
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186 struct _d_exception |
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187 { |
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188 Object exception_object; |
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189 _Unwind_Exception unwind_info; |
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190 } |
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191 |
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192 // the 8-byte string identifying the type of exception |
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193 // the first 4 are for vendor, the second 4 for language |
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194 //TODO: This may be the wrong way around |
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195 char[8] _d_exception_class = "LLDCD1\0\0"; |
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196 |
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197 |
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198 // |
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199 // x86 unwind specific implementation of personality function |
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200 // and helpers |
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201 // |
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202 version(X86_UNWIND) |
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203 { |
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204 |
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205 // the personality routine gets called by the unwind handler and is responsible for |
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206 // reading the EH tables and deciding what to do |
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207 extern(C) _Unwind_Reason_Code _d_eh_personality(int ver, _Unwind_Action actions, ulong exception_class, _Unwind_Exception* exception_info, _Unwind_Context_Ptr context) |
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208 { |
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209 // check ver: the C++ Itanium ABI only allows ver == 1 |
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210 if(ver != 1) |
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211 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
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212 |
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213 // check exceptionClass |
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214 //TODO: Treat foreign exceptions with more respect |
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215 if((cast(char*)&exception_class)[0..8] != _d_exception_class) |
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216 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
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217 |
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218 // find call site table, action table and classinfo table |
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219 // Note: callsite and action tables do not contain static-length |
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220 // data and will be parsed as needed |
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221 // Note: classinfo_table points past the end of the table |
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222 ubyte* callsite_table; |
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223 ubyte* action_table; |
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224 ClassInfo* classinfo_table; |
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225 _d_getLanguageSpecificTables(context, callsite_table, action_table, classinfo_table); |
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226 |
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227 |
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228 /* |
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229 find landing pad and action table index belonging to ip by walking |
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230 the callsite_table |
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231 */ |
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232 ubyte* callsite_walker = callsite_table; |
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233 |
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234 // get the instruction pointer |
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235 // will be used to find the right entry in the callsite_table |
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236 // -1 because it will point past the last instruction |
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237 ptrdiff_t ip = _Unwind_GetIP(context) - 1; |
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238 |
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239 // address block_start is relative to |
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240 ptrdiff_t region_start = _Unwind_GetRegionStart(context); |
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241 |
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242 // table entries |
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243 uint block_start_offset, block_size; |
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244 ptrdiff_t landing_pad; |
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245 size_t action_offset; |
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246 |
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247 while(true) { |
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248 // if we've gone through the list and found nothing... |
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249 if(callsite_walker >= action_table) |
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250 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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251 |
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252 block_start_offset = *cast(uint*)callsite_walker; |
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253 block_size = *(cast(uint*)callsite_walker + 1); |
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254 landing_pad = *(cast(uint*)callsite_walker + 2); |
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255 if(landing_pad) |
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256 landing_pad += region_start; |
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257 callsite_walker = get_uleb128(callsite_walker + 3*uint.sizeof, action_offset); |
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258 |
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259 debug(EH_personality_verbose) printf("ip=%llx %d %d %llx\n", ip, block_start_offset, block_size, landing_pad); |
443
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260 |
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261 // since the list is sorted, as soon as we're past the ip |
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262 // there's no handler to be found |
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263 if(ip < region_start + block_start_offset) |
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264 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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265 |
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266 // if we've found our block, exit |
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267 if(ip < region_start + block_start_offset + block_size) |
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268 break; |
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269 } |
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270 |
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271 debug(EH_personality) printf("Found correct landing pad and actionOffset %d\n", action_offset); |
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272 |
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273 // now we need the exception's classinfo to find a handler |
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274 // the exception_info is actually a member of a larger _d_exception struct |
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275 // the runtime allocated. get that now |
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276 _d_exception* exception_struct = cast(_d_exception*)(cast(ubyte*)exception_info - _d_exception.unwind_info.offsetof); |
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277 |
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278 // if there's no action offset and no landing pad, continue unwinding |
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279 if(!action_offset && !landing_pad) |
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280 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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281 |
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282 // if there's no action offset but a landing pad, this is a cleanup handler |
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283 else if(!action_offset && landing_pad) |
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284 return _d_eh_install_finally_context(actions, landing_pad, exception_struct, context); |
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285 |
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286 /* |
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287 walk action table chain, comparing classinfos using _d_isbaseof |
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288 */ |
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289 ubyte* action_walker = action_table + action_offset - 1; |
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290 |
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291 ptrdiff_t ti_offset, next_action_offset; |
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292 while(true) { |
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293 action_walker = get_sleb128(action_walker, ti_offset); |
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294 // it is intentional that we not modify action_walker here |
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295 // next_action_offset is from current action_walker position |
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296 get_sleb128(action_walker, next_action_offset); |
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297 |
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298 // negative are 'filters' which we don't use |
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299 if(!(ti_offset >= 0)) |
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300 fatalerror("Filter actions are unsupported"); |
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301 |
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302 // zero means cleanup, which we require to be the last action |
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303 if(ti_offset == 0) { |
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304 if(!(next_action_offset == 0)) |
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305 fatalerror("Cleanup action must be last in chain"); |
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306 return _d_eh_install_finally_context(actions, landing_pad, exception_struct, context); |
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307 } |
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308 |
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309 // get classinfo for action and check if the one in the |
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310 // exception structure is a base |
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311 ClassInfo catch_ci = *(classinfo_table - ti_offset); |
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312 debug(EH_personality) printf("Comparing catch %s to exception %s\n", catch_ci.name.ptr, exception_struct.exception_object.classinfo.name.ptr); |
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313 if(_d_isbaseof(exception_struct.exception_object.classinfo, catch_ci)) |
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314 return _d_eh_install_catch_context(actions, ti_offset, landing_pad, exception_struct, context); |
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315 |
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316 // we've walked through all actions and found nothing... |
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317 if(next_action_offset == 0) |
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318 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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319 else |
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320 action_walker += next_action_offset; |
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321 } |
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322 |
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323 fatalerror("reached unreachable"); |
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324 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
443
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325 } |
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326 |
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327 // These are the register numbers for SetGR that |
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328 // llvm's eh.exception and eh.selector intrinsics |
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329 // will pick up. |
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330 // Hints for these can be found by looking at the |
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331 // EH_RETURN_DATA_REGNO macro in GCC, careful testing |
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332 // is required though. |
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333 version (X86_64) |
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334 { |
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335 private int eh_exception_regno = 0; |
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336 private int eh_selector_regno = 1; |
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337 } else { |
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338 private int eh_exception_regno = 0; |
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339 private int eh_selector_regno = 2; |
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340 } |
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341 |
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342 private _Unwind_Reason_Code _d_eh_install_catch_context(_Unwind_Action actions, ptrdiff_t switchval, ptrdiff_t landing_pad, _d_exception* exception_struct, _Unwind_Context_Ptr context) |
443
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343 { |
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344 debug(EH_personality) printf("Found catch clause!\n"); |
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345 |
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346 if(actions & _Unwind_Action.SEARCH_PHASE) |
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347 return _Unwind_Reason_Code.HANDLER_FOUND; |
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348 |
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349 else if(actions & _Unwind_Action.HANDLER_PHASE) |
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350 { |
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351 debug(EH_personality) printf("Setting switch value to: %d!\n", switchval); |
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352 _Unwind_SetGR(context, eh_exception_regno, cast(ptrdiff_t)cast(void*)(exception_struct.exception_object)); |
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353 _Unwind_SetGR(context, eh_selector_regno, cast(ptrdiff_t)switchval); |
443
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354 _Unwind_SetIP(context, landing_pad); |
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355 return _Unwind_Reason_Code.INSTALL_CONTEXT; |
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356 } |
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357 |
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358 fatalerror("reached unreachable"); |
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359 return _Unwind_Reason_Code.FATAL_PHASE2_ERROR; |
443
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360 } |
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361 |
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362 private _Unwind_Reason_Code _d_eh_install_finally_context(_Unwind_Action actions, ptrdiff_t landing_pad, _d_exception* exception_struct, _Unwind_Context_Ptr context) |
443
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363 { |
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364 // if we're merely in search phase, continue |
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365 if(actions & _Unwind_Action.SEARCH_PHASE) |
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366 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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367 |
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368 debug(EH_personality) printf("Calling cleanup routine...\n"); |
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369 |
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370 _Unwind_SetGR(context, eh_exception_regno, cast(ptrdiff_t)exception_struct); |
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371 _Unwind_SetGR(context, eh_selector_regno, 0); |
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372 _Unwind_SetIP(context, landing_pad); |
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373 return _Unwind_Reason_Code.INSTALL_CONTEXT; |
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374 } |
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375 |
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376 private void _d_getLanguageSpecificTables(_Unwind_Context_Ptr context, ref ubyte* callsite, ref ubyte* action, ref ClassInfo* ci) |
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377 { |
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378 ubyte* data = cast(ubyte*)_Unwind_GetLanguageSpecificData(context); |
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379 |
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380 //TODO: Do proper DWARF reading here |
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381 if(*data++ != 0xff) |
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382 fatalerror("DWARF header has unexpected format 1"); |
443
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383 |
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384 if(*data++ != 0x00) |
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385 fatalerror("DWARF header has unexpected format 2"); |
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386 size_t cioffset; |
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387 data = get_uleb128(data, cioffset); |
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388 ci = cast(ClassInfo*)(data + cioffset); |
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389 |
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390 if(*data++ != 0x03) |
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391 fatalerror("DWARF header has unexpected format 3"); |
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392 size_t callsitelength; |
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393 data = get_uleb128(data, callsitelength); |
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394 action = data + callsitelength; |
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395 |
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396 callsite = data; |
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397 } |
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398 |
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399 } // end of x86 Linux specific implementation |
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400 |
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401 |
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402 extern(C) void _d_throw_exception(Object e) |
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403 { |
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404 if (e !is null) |
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405 { |
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406 _d_exception* exc_struct = new _d_exception; |
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407 exc_struct.unwind_info.exception_class[] = _d_exception_class; |
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408 exc_struct.exception_object = e; |
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409 _Unwind_Reason_Code ret = _Unwind_RaiseException(&exc_struct.unwind_info); |
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410 console("_Unwind_RaiseException failed with reason code: ")(ret)("\n"); |
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411 } |
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412 abort(); |
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413 } |
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414 |
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415 extern(C) void _d_eh_resume_unwind(_d_exception* exception_struct) |
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416 { |
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417 _Unwind_Resume(&exception_struct.unwind_info); |
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418 } |