Mercurial > projects > ldc
annotate runtime/internal/eh.d @ 650:aa6a0b7968f7
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> |
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date | Sun, 05 Oct 2008 17:28:15 +0200 |
parents | aef77ae1d32c |
children | 6aaa3d3c1183 |
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 llvmdc.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 } |
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18 |
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19 private extern(C) void abort(); |
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20 private extern(C) int printf(char*, ...); |
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21 private extern(C) int vprintf(char*, va_list va); |
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22 |
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23 // D runtime functions |
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24 extern(C) { |
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25 int _d_isbaseof(ClassInfo oc, ClassInfo c); |
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26 } |
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27 |
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28 // libunwind headers |
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29 extern(C) |
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30 { |
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31 enum _Unwind_Reason_Code |
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32 { |
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33 NO_REASON = 0, |
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34 FOREIGN_EXCEPTION_CAUGHT = 1, |
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35 FATAL_PHASE2_ERROR = 2, |
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36 FATAL_PHASE1_ERROR = 3, |
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37 NORMAL_STOP = 4, |
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38 END_OF_STACK = 5, |
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39 HANDLER_FOUND = 6, |
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40 INSTALL_CONTEXT = 7, |
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41 CONTINUE_UNWIND = 8 |
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42 } |
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43 |
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44 enum _Unwind_Action |
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45 { |
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46 SEARCH_PHASE = 1, |
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47 CLEANUP_PHASE = 2, |
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48 HANDLER_PHASE = 3, |
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49 FORCE_UNWIND = 4 |
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50 } |
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51 |
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52 alias void* _Unwind_Context_Ptr; |
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53 |
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54 alias void function(_Unwind_Reason_Code, _Unwind_Exception*) _Unwind_Exception_Cleanup_Fn; |
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55 |
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56 struct _Unwind_Exception |
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57 { |
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58 char[8] exception_class; |
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59 _Unwind_Exception_Cleanup_Fn exception_cleanup; |
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60 int private_1; |
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61 int private_2; |
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62 } |
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63 |
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64 version(X86_UNWIND) |
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65 { |
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66 void _Unwind_Resume(_Unwind_Exception*); |
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67 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception*); |
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68 ulong _Unwind_GetLanguageSpecificData(_Unwind_Context_Ptr context); |
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69 ulong _Unwind_GetIP(_Unwind_Context_Ptr context); |
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70 ulong _Unwind_SetIP(_Unwind_Context_Ptr context, ulong new_value); |
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71 ulong _Unwind_SetGR(_Unwind_Context_Ptr context, int index, ulong new_value); |
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72 ulong _Unwind_GetRegionStart(_Unwind_Context_Ptr context); |
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73 } |
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74 else |
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75 { |
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76 // runtime calls these directly |
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77 void _Unwind_Resume(_Unwind_Exception*) |
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78 { |
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79 console("_Unwind_Resume is not implemented on this platform.\n"); |
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80 } |
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81 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception*) |
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82 { |
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83 console("_Unwind_RaiseException is not implemented on this platform.\n"); |
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84 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
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85 } |
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86 } |
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87 |
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88 } |
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89 |
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90 // error and exit |
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91 extern(C) private void fatalerror(char* format, ...) |
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92 { |
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93 va_list args; |
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94 va_start(args, format); |
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95 printf("Fatal error in EH code: "); |
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96 vprintf(format, args); |
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97 printf("\n"); |
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98 abort(); |
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99 } |
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100 |
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101 |
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102 // helpers for reading certain DWARF data |
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103 private ubyte* get_uleb128(ubyte* addr, ref size_t res) |
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104 { |
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105 res = 0; |
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106 size_t bitsize = 0; |
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107 |
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108 // read as long as high bit is set |
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109 while(*addr & 0x80) { |
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110 res |= (*addr & 0x7f) << bitsize; |
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111 bitsize += 7; |
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112 addr += 1; |
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113 if(bitsize >= size_t.sizeof*8) |
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114 fatalerror("tried to read uleb128 that exceeded size of size_t"); |
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115 } |
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116 // read last |
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117 if(bitsize != 0 && *addr >= 1 << size_t.sizeof*8 - bitsize) |
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118 fatalerror("Fatal error in EH code: tried to read uleb128 that exceeded size of size_t"); |
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119 res |= (*addr) << bitsize; |
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120 |
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121 return addr + 1; |
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122 } |
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123 |
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124 private ubyte* get_sleb128(ubyte* addr, ref ptrdiff_t res) |
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125 { |
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126 res = 0; |
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127 size_t bitsize = 0; |
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128 |
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129 // read as long as high bit is set |
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130 while(*addr & 0x80) { |
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131 res |= (*addr & 0x7f) << bitsize; |
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132 bitsize += 7; |
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133 addr += 1; |
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134 if(bitsize >= size_t.sizeof*8) |
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135 fatalerror("tried to read sleb128 that exceeded size of size_t"); |
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136 } |
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137 // read last |
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138 if(bitsize != 0 && *addr >= 1 << size_t.sizeof*8 - bitsize) |
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139 fatalerror("tried to read sleb128 that exceeded size of size_t"); |
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140 res |= (*addr) << bitsize; |
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141 |
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142 // take care of sign |
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143 if(bitsize < size_t.sizeof*8 && ((*addr) & 0x40)) |
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144 res |= cast(ptrdiff_t)(-1) ^ ((1 << (bitsize+7)) - 1); |
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145 |
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146 return addr + 1; |
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147 } |
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148 |
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149 |
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150 // exception struct used by the runtime. |
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151 // _d_throw allocates a new instance and passes the address of its |
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152 // _Unwind_Exception member to the unwind call. The personality |
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153 // routine is then able to get the whole struct by looking at the data |
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154 // surrounding the unwind info. |
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155 struct _d_exception |
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156 { |
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157 Object exception_object; |
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158 _Unwind_Exception unwind_info; |
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159 } |
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160 |
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161 // the 8-byte string identifying the type of exception |
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162 // the first 4 are for vendor, the second 4 for language |
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163 //TODO: This may be the wrong way around |
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164 char[8] _d_exception_class = "LLDCD1\0\0"; |
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165 |
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166 |
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167 // |
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168 // x86 unwind specific implementation of personality function |
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169 // and helpers |
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170 // |
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171 version(X86_UNWIND) |
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172 { |
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173 |
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174 // the personality routine gets called by the unwind handler and is responsible for |
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175 // reading the EH tables and deciding what to do |
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176 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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177 { |
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178 // check ver: the C++ Itanium ABI only allows ver == 1 |
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179 if(ver != 1) |
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180 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
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181 |
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182 // check exceptionClass |
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183 //TODO: Treat foreign exceptions with more respect |
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184 if((cast(char*)&exception_class)[0..8] != _d_exception_class) |
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185 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
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186 |
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187 // find call site table, action table and classinfo table |
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188 // Note: callsite and action tables do not contain static-length |
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189 // data and will be parsed as needed |
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190 // Note: classinfo_table points past the end of the table |
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191 ubyte* callsite_table; |
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192 ubyte* action_table; |
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193 ClassInfo* classinfo_table; |
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194 _d_getLanguageSpecificTables(context, callsite_table, action_table, classinfo_table); |
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195 |
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196 |
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197 /* |
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198 find landing pad and action table index belonging to ip by walking |
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199 the callsite_table |
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200 */ |
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201 ubyte* callsite_walker = callsite_table; |
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202 |
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203 // get the instruction pointer |
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204 // will be used to find the right entry in the callsite_table |
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205 // -1 because it will point past the last instruction |
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206 ulong ip = _Unwind_GetIP(context) - 1; |
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207 |
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208 // address block_start is relative to |
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209 ulong region_start = _Unwind_GetRegionStart(context); |
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210 |
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211 // table entries |
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212 uint block_start_offset, block_size; |
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213 ulong landing_pad; |
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214 size_t action_offset; |
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215 |
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216 while(true) { |
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217 // if we've gone through the list and found nothing... |
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218 if(callsite_walker >= action_table) |
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219 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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220 |
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221 block_start_offset = *cast(uint*)callsite_walker; |
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222 block_size = *(cast(uint*)callsite_walker + 1); |
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223 landing_pad = *(cast(uint*)callsite_walker + 2); |
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224 if(landing_pad) |
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225 landing_pad += region_start; |
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226 callsite_walker = get_uleb128(callsite_walker + 3*uint.sizeof, action_offset); |
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227 |
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228 debug(EH_personality_verbose) printf("%d %d %d\n", block_start_offset, block_size, landing_pad); |
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229 |
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230 // since the list is sorted, as soon as we're past the ip |
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231 // there's no handler to be found |
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232 if(ip < region_start + block_start_offset) |
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233 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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234 |
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235 // if we've found our block, exit |
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236 if(ip < region_start + block_start_offset + block_size) |
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237 break; |
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238 } |
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239 |
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240 debug(EH_personality) printf("Found correct landing pad and actionOffset %d\n", action_offset); |
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241 |
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242 // now we need the exception's classinfo to find a handler |
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243 // the exception_info is actually a member of a larger _d_exception struct |
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244 // the runtime allocated. get that now |
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245 _d_exception* exception_struct = cast(_d_exception*)(cast(ubyte*)exception_info - _d_exception.unwind_info.offsetof); |
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246 |
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247 // if there's no action offset and no landing pad, continue unwinding |
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248 if(!action_offset && !landing_pad) |
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249 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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250 |
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251 // if there's no action offset but a landing pad, this is a cleanup handler |
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252 else if(!action_offset && landing_pad) |
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253 return _d_eh_install_finally_context(actions, landing_pad, exception_struct, context); |
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254 |
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255 /* |
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256 walk action table chain, comparing classinfos using _d_isbaseof |
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257 */ |
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258 ubyte* action_walker = action_table + action_offset - 1; |
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259 |
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260 ptrdiff_t ti_offset, next_action_offset; |
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261 while(true) { |
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262 action_walker = get_sleb128(action_walker, ti_offset); |
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263 // it is intentional that we not modify action_walker here |
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264 // next_action_offset is from current action_walker position |
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265 get_sleb128(action_walker, next_action_offset); |
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266 |
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267 // negative are 'filters' which we don't use |
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268 if(!(ti_offset >= 0)) |
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269 fatalerror("Filter actions are unsupported"); |
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270 |
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271 // zero means cleanup, which we require to be the last action |
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272 if(ti_offset == 0) { |
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273 if(!(next_action_offset == 0)) |
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274 fatalerror("Cleanup action must be last in chain"); |
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275 return _d_eh_install_finally_context(actions, landing_pad, exception_struct, context); |
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276 } |
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277 |
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278 // get classinfo for action and check if the one in the |
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279 // exception structure is a base |
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280 ClassInfo catch_ci = classinfo_table[-ti_offset]; |
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281 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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282 if(_d_isbaseof(exception_struct.exception_object.classinfo, catch_ci)) |
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283 return _d_eh_install_catch_context(actions, ti_offset, landing_pad, exception_struct, context); |
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284 |
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285 // we've walked through all actions and found nothing... |
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286 if(next_action_offset == 0) |
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287 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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288 else |
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289 action_walker += next_action_offset; |
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290 } |
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291 |
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292 fatalerror("reached unreachable"); |
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293 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
443
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294 } |
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295 |
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296 // These are the register numbers for SetGR that |
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297 // llvm's eh.exception and eh.selector intrinsics |
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298 // will pick up. |
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299 // Found by trial-and-error and probably platform dependent! |
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300 private int eh_exception_regno = 0; |
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301 private int eh_selector_regno = 2; |
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302 |
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303 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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304 { |
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305 debug(EH_personality) printf("Found catch clause!\n"); |
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306 |
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307 if(actions & _Unwind_Action.SEARCH_PHASE) |
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308 return _Unwind_Reason_Code.HANDLER_FOUND; |
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309 |
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310 else if(actions & _Unwind_Action.HANDLER_PHASE) |
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311 { |
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312 debug(EH_personality) printf("Setting switch value to: %d!\n", switchval); |
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313 _Unwind_SetGR(context, eh_exception_regno, cast(ulong)cast(void*)(exception_struct.exception_object)); |
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314 _Unwind_SetGR(context, eh_selector_regno, switchval); |
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315 _Unwind_SetIP(context, landing_pad); |
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316 return _Unwind_Reason_Code.INSTALL_CONTEXT; |
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317 } |
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318 |
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319 fatalerror("reached unreachable"); |
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320 return _Unwind_Reason_Code.FATAL_PHASE2_ERROR; |
443
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321 } |
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322 |
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323 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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324 { |
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325 // if we're merely in search phase, continue |
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326 if(actions & _Unwind_Action.SEARCH_PHASE) |
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327 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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328 |
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329 debug(EH_personality) printf("Calling cleanup routine...\n"); |
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330 |
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331 _Unwind_SetGR(context, eh_exception_regno, cast(ulong)exception_struct); |
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332 _Unwind_SetGR(context, eh_selector_regno, 0); |
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333 _Unwind_SetIP(context, landing_pad); |
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334 return _Unwind_Reason_Code.INSTALL_CONTEXT; |
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335 } |
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336 |
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337 private void _d_getLanguageSpecificTables(_Unwind_Context_Ptr context, ref ubyte* callsite, ref ubyte* action, ref ClassInfo* ci) |
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338 { |
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339 ubyte* data = cast(ubyte*)_Unwind_GetLanguageSpecificData(context); |
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340 |
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341 //TODO: Do proper DWARF reading here |
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342 if(*data++ != 0xff) |
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343 fatalerror("DWARF header has unexpected format 1"); |
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344 |
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345 if(*data++ != 0x00) |
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346 fatalerror("DWARF header has unexpected format 2"); |
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347 size_t cioffset; |
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348 data = get_uleb128(data, cioffset); |
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349 ci = cast(ClassInfo*)(data + cioffset); |
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350 |
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351 if(*data++ != 0x03) |
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352 fatalerror("DWARF header has unexpected format 3"); |
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353 size_t callsitelength; |
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354 data = get_uleb128(data, callsitelength); |
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355 action = data + callsitelength; |
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356 |
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357 callsite = data; |
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358 } |
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359 |
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360 } // end of x86 Linux specific implementation |
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361 |
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362 |
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363 extern(C) void _d_throw_exception(Object e) |
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364 { |
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365 if (e !is null) |
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366 { |
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367 _d_exception* exc_struct = new _d_exception; |
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368 exc_struct.unwind_info.exception_class[] = _d_exception_class; |
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369 exc_struct.exception_object = e; |
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370 _Unwind_Reason_Code ret = _Unwind_RaiseException(&exc_struct.unwind_info); |
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371 console("_Unwind_RaiseException failed with reason code: ")(ret)("\n"); |
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372 } |
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373 abort(); |
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374 } |
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375 |
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376 extern(C) void _d_eh_resume_unwind(_d_exception* exception_struct) |
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377 { |
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378 _Unwind_Resume(&exception_struct.unwind_info); |
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379 } |