Mercurial > projects > ldc
annotate lphobos/internal/eh.d @ 1613:8f50a13d09a0
Merge DMD r286: remove dead code
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dmd/interpret.c | 49 ++-----------------------------------------------
dmd/mars.c | 2 +-
2 files changed, 3 insertions(+), 48 deletions(-)
author | Leandro Lucarella <llucax@gmail.com> |
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date | Wed, 06 Jan 2010 15:18:21 -0300 |
parents | 88e23f8c2354 |
children |
rev | line source |
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473
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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 // debug = EH_personality; |
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8 // debug = EH_personality_verbose; |
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9 |
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10 // current EH implementation works on x86 linux only |
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11 version(X86) version(linux) version=X86_LINUX; |
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12 |
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13 private extern(C) void abort(); |
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14 private extern(C) int printf(char*, ...); |
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15 |
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16 // D runtime functions |
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17 extern(C) { |
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18 int _d_isbaseof(ClassInfo oc, ClassInfo c); |
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19 } |
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20 |
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21 // libunwind headers |
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22 extern(C) |
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23 { |
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24 enum _Unwind_Reason_Code |
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25 { |
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26 NO_REASON = 0, |
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27 FOREIGN_EXCEPTION_CAUGHT = 1, |
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28 FATAL_PHASE2_ERROR = 2, |
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29 FATAL_PHASE1_ERROR = 3, |
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30 NORMAL_STOP = 4, |
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31 END_OF_STACK = 5, |
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32 HANDLER_FOUND = 6, |
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33 INSTALL_CONTEXT = 7, |
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34 CONTINUE_UNWIND = 8 |
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35 } |
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36 |
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37 enum _Unwind_Action |
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38 { |
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39 SEARCH_PHASE = 1, |
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40 CLEANUP_PHASE = 2, |
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41 HANDLER_PHASE = 3, |
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42 FORCE_UNWIND = 4 |
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43 } |
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44 |
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45 alias void* _Unwind_Context_Ptr; |
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46 |
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47 alias void function(_Unwind_Reason_Code, _Unwind_Exception*) _Unwind_Exception_Cleanup_Fn; |
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48 |
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49 struct _Unwind_Exception |
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50 { |
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51 char[8] exception_class; |
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52 _Unwind_Exception_Cleanup_Fn exception_cleanup; |
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53 int private_1; |
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54 int private_2; |
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55 } |
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56 |
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57 version(X86_LINUX) |
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58 { |
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59 void _Unwind_Resume(_Unwind_Exception*); |
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60 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception*); |
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61 ulong _Unwind_GetLanguageSpecificData(_Unwind_Context_Ptr context); |
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62 ulong _Unwind_GetIP(_Unwind_Context_Ptr context); |
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63 ulong _Unwind_SetIP(_Unwind_Context_Ptr context, ulong new_value); |
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64 ulong _Unwind_SetGR(_Unwind_Context_Ptr context, int index, ulong new_value); |
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65 ulong _Unwind_GetRegionStart(_Unwind_Context_Ptr context); |
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66 } |
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67 else |
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68 { |
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69 // runtime calls these directly |
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70 void _Unwind_Resume(_Unwind_Exception*) |
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71 { |
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72 printf("_Unwind_Resume is not implemented on this platform.\n"); |
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73 } |
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74 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception*) |
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75 { |
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76 printf("_Unwind_RaiseException is not implemented on this platform.\n"); |
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77 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
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78 } |
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79 } |
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80 |
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81 } |
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82 |
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83 |
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84 // helpers for reading certain DWARF data |
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85 //TODO: It may not be a good idea to use exceptions for error handling within exception handling code |
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86 private ubyte* get_uleb128(ubyte* addr, ref size_t res) |
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87 { |
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88 res = 0; |
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89 size_t bitsize = 0; |
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90 |
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91 // read as long as high bit is set |
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92 while(*addr & 0x80) { |
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93 res |= (*addr & 0x7f) << bitsize; |
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94 bitsize += 7; |
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95 addr += 1; |
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96 if(bitsize >= size_t.sizeof*8) |
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97 throw new Exception("tried to read uleb128 that exceeded size of size_t"); |
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98 } |
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99 // read last |
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100 if(bitsize != 0 && *addr >= 1 << size_t.sizeof*8 - bitsize) |
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101 throw new Exception("tried to read uleb128 that exceeded size of size_t"); |
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102 res |= (*addr) << bitsize; |
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103 |
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104 return addr + 1; |
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105 } |
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106 |
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107 private ubyte* get_sleb128(ubyte* addr, ref ptrdiff_t res) |
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108 { |
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109 res = 0; |
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110 size_t bitsize = 0; |
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111 |
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112 // read as long as high bit is set |
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113 while(*addr & 0x80) { |
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114 res |= (*addr & 0x7f) << bitsize; |
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115 bitsize += 7; |
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116 addr += 1; |
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117 if(bitsize >= size_t.sizeof*8) |
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118 throw new Exception("tried to read sleb128 that exceeded size of size_t"); |
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119 } |
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120 // read last |
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121 if(bitsize != 0 && *addr >= 1 << size_t.sizeof*8 - bitsize) |
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122 throw new Exception("tried to read sleb128 that exceeded size of size_t"); |
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123 res |= (*addr) << bitsize; |
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124 |
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125 // take care of sign |
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126 if(bitsize < size_t.sizeof*8 && ((*addr) & 0x40)) |
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127 res |= cast(ptrdiff_t)(-1) ^ ((1 << (bitsize+7)) - 1); |
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128 |
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129 return addr + 1; |
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130 } |
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131 |
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132 |
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133 // exception struct used by the runtime. |
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134 // _d_throw allocates a new instance and passes the address of its |
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135 // _Unwind_Exception member to the unwind call. The personality |
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136 // routine is then able to get the whole struct by looking at the data |
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137 // surrounding the unwind info. |
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138 struct _d_exception |
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139 { |
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140 Object exception_object; |
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141 _Unwind_Exception unwind_info; |
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142 } |
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143 |
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144 // the 8-byte string identifying the type of exception |
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145 // the first 4 are for vendor, the second 4 for language |
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146 //TODO: This may be the wrong way around |
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147 char[8] _d_exception_class = "LLDCD1\0\0"; |
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148 |
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149 |
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150 // |
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151 // x86 Linux specific implementation of personality function |
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152 // and helpers |
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153 // |
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154 version(X86_LINUX) |
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155 { |
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156 |
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157 // the personality routine gets called by the unwind handler and is responsible for |
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158 // reading the EH tables and deciding what to do |
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159 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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160 { |
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161 printf("eh_personality is running\n"); |
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162 // check ver: the C++ Itanium ABI only allows ver == 1 |
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163 if(ver != 1) { |
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164 printf("Fatal Phase1 #1\n"); |
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165 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
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166 } |
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167 |
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168 // check exceptionClass |
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169 //TODO: Treat foreign exceptions with more respect |
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170 if((cast(char*)&exception_class)[0..8] != _d_exception_class) { |
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171 printf("Fatal Phase1 #2: %s != %s\n", cast(char*)&exception_class, cast(char*) _d_exception_class); |
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172 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
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173 } |
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174 |
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175 // find call site table, action table and classinfo table |
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176 // Note: callsite and action tables do not contain static-length |
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177 // data and will be parsed as needed |
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178 // Note: classinfo_table points past the end of the table |
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179 ubyte* callsite_table; |
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180 ubyte* action_table; |
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181 ClassInfo* classinfo_table; |
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182 _d_getLanguageSpecificTables(context, callsite_table, action_table, classinfo_table); |
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183 |
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184 |
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185 /* |
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186 find landing pad and action table index belonging to ip by walking |
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187 the callsite_table |
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188 */ |
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189 ubyte* callsite_walker = callsite_table; |
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190 |
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191 // get the instruction pointer |
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192 // will be used to find the right entry in the callsite_table |
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193 // -1 because it will point past the last instruction |
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194 ulong ip = _Unwind_GetIP(context) - 1; |
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195 |
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196 // address block_start is relative to |
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197 ulong region_start = _Unwind_GetRegionStart(context); |
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198 |
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199 // table entries |
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200 uint block_start_offset, block_size; |
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201 ulong landing_pad; |
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202 size_t action_offset; |
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203 |
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204 while(true) { |
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205 // if we've gone through the list and found nothing... |
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206 if(callsite_walker >= action_table) { |
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207 printf("Continue unwind #3\n"); |
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208 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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209 } |
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210 |
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211 block_start_offset = *cast(uint*)callsite_walker; |
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212 block_size = *(cast(uint*)callsite_walker + 1); |
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213 landing_pad = *(cast(uint*)callsite_walker + 2); |
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214 if(landing_pad) |
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215 landing_pad += region_start; |
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216 callsite_walker = get_uleb128(callsite_walker + 3*uint.sizeof, action_offset); |
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217 |
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218 /*debug(EH_personality_verbose) */printf("%d %d %d\n", block_start_offset, block_size, landing_pad); |
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219 |
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220 // since the list is sorted, as soon as we're past the ip |
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221 // there's no handler to be found |
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222 if(ip < region_start + block_start_offset) { |
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223 printf("Continue unwind #4\n"); |
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224 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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225 } |
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226 |
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227 // if we've found our block, exit |
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228 if(ip < region_start + block_start_offset + block_size) |
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229 break; |
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230 } |
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231 |
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232 /*debug(EH_personality) */printf("Found correct landing pad and actionOffset %d\n", action_offset); |
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233 |
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234 // now we need the exception's classinfo to find a handler |
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235 // the exception_info is actually a member of a larger _d_exception struct |
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236 // the runtime allocated. get that now |
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237 _d_exception* exception_struct = cast(_d_exception*)(cast(ubyte*)exception_info - _d_exception.unwind_info.offsetof); |
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238 |
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239 // if there's no action offset and no landing pad, continue unwinding |
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240 if(!action_offset && !landing_pad) { |
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241 printf("Continue unwind #5\n"); |
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242 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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243 } |
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244 |
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245 // if there's no action offset but a landing pad, this is a cleanup handler |
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246 else if(!action_offset && landing_pad) { |
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247 printf("Install cleanup handler #6\n"); |
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248 return _d_eh_install_finally_context(actions, landing_pad, exception_struct, context); |
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249 } |
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250 |
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251 /* |
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252 walk action table chain, comparing classinfos using _d_isbaseof |
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253 */ |
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254 ubyte* action_walker = action_table + action_offset - 1; |
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255 |
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256 ptrdiff_t ti_offset, next_action_offset; |
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257 while(true) { |
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258 action_walker = get_sleb128(action_walker, ti_offset); |
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259 // it is intentional that we not modify action_walker here |
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260 // next_action_offset is from current action_walker position |
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261 get_sleb128(action_walker, next_action_offset); |
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262 |
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263 // negative are 'filters' which we don't use |
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264 assert(ti_offset >= 0 && "Filter actions are unsupported"); |
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265 |
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266 // zero means cleanup, which we require to be the last action |
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267 if(ti_offset == 0) { |
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268 assert(next_action_offset == 0 && "Cleanup action must be last in chain"); |
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269 printf("Cleanup handler #7\n"); |
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270 return _d_eh_install_finally_context(actions, landing_pad, exception_struct, context); |
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271 } |
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272 |
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273 // get classinfo for action and check if the one in the |
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274 // exception structure is a base |
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275 ClassInfo catch_ci = classinfo_table[-ti_offset]; |
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276 /*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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277 if(_d_isbaseof(exception_struct.exception_object.classinfo, catch_ci)) { |
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278 printf("Install catch context #8\n"); |
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279 return _d_eh_install_catch_context(actions, ti_offset, landing_pad, exception_struct, context); |
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280 } |
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281 |
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282 // we've walked through all actions and found nothing... |
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283 if(next_action_offset == 0) { |
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284 printf("Continue unwind #9\n"); |
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285 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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286 } else |
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287 action_walker += next_action_offset; |
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288 } |
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289 |
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290 /*printf("Assertion failure ;_;\n"); |
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291 assert(false);*/ |
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292 } |
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293 |
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294 // These are the register numbers for SetGR that |
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295 // llvm's eh.exception and eh.selector intrinsics |
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296 // will pick up. |
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297 // Found by trial-and-error and probably platform dependent! |
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298 private int eh_exception_regno = 0; |
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299 private int eh_selector_regno = 2; |
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300 |
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301 private _Unwind_Reason_Code _d_eh_install_catch_context(_Unwind_Action actions, ptrdiff_t switchval, ulong landing_pad, _d_exception* exception_struct, _Unwind_Context_Ptr context) |
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302 { |
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303 debug(EH_personality) printf("Found catch clause!\n"); |
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304 |
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305 if(actions & _Unwind_Action.SEARCH_PHASE) |
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306 return _Unwind_Reason_Code.HANDLER_FOUND; |
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307 |
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308 else if(actions & _Unwind_Action.HANDLER_PHASE) |
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309 { |
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310 debug(EH_personality) printf("Setting switch value to: %d!\n", switchval); |
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311 _Unwind_SetGR(context, eh_exception_regno, cast(ulong)cast(void*)(exception_struct.exception_object)); |
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312 _Unwind_SetGR(context, eh_selector_regno, switchval); |
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313 _Unwind_SetIP(context, landing_pad); |
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314 return _Unwind_Reason_Code.INSTALL_CONTEXT; |
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315 } |
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316 |
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317 assert(false); |
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318 } |
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319 |
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320 private _Unwind_Reason_Code _d_eh_install_finally_context(_Unwind_Action actions, ulong landing_pad, _d_exception* exception_struct, _Unwind_Context_Ptr context) |
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321 { |
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322 // if we're merely in search phase, continue |
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323 if(actions & _Unwind_Action.SEARCH_PHASE) |
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324 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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325 |
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326 debug(EH_personality) printf("Calling cleanup routine...\n"); |
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327 |
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328 _Unwind_SetGR(context, eh_exception_regno, cast(ulong)exception_struct); |
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329 _Unwind_SetGR(context, eh_selector_regno, 0); |
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330 _Unwind_SetIP(context, landing_pad); |
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331 return _Unwind_Reason_Code.INSTALL_CONTEXT; |
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332 } |
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333 |
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334 private void _d_getLanguageSpecificTables(_Unwind_Context_Ptr context, ref ubyte* callsite, ref ubyte* action, ref ClassInfo* ci) |
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335 { |
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336 ubyte* data = cast(ubyte*)_Unwind_GetLanguageSpecificData(context); |
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337 |
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338 //TODO: Do proper DWARF reading here |
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339 assert(*data++ == 0xff); |
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340 |
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341 assert(*data++ == 0x00); |
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342 size_t cioffset; |
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343 data = get_uleb128(data, cioffset); |
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344 ci = cast(ClassInfo*)(data + cioffset); |
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345 |
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346 assert(*data++ == 0x03); |
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347 size_t callsitelength; |
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348 data = get_uleb128(data, callsitelength); |
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349 action = data + callsitelength; |
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350 |
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351 callsite = data; |
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352 } |
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353 |
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354 } // end of x86 Linux specific implementation |
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355 |
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356 extern(C) void* malloc(size_t size); |
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357 |
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358 extern(C) void _d_throw_exception(Object e) |
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359 { |
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360 if (e !is null) |
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361 { |
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362 // _d_exception* exc_struct = new _d_exception; |
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363 auto exc_struct = cast(_d_exception*)malloc(_d_exception.sizeof); |
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364 exc_struct.unwind_info.exception_class[] = _d_exception_class; |
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365 exc_struct.exception_object = e; |
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366 printf("Raising exception\n"); |
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367 _Unwind_Reason_Code ret = _Unwind_RaiseException(&exc_struct.unwind_info); |
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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368 printf("_Unwind_RaiseException failed with reason code: %i\n", ret); |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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369 } |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
370 abort(); |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
371 } |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
372 |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
373 extern(C) void _d_eh_resume_unwind(_d_exception* exception_struct) |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
374 { |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
375 _Unwind_Resume(&exception_struct.unwind_info); |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
376 } |