Mercurial > projects > ldc
annotate runtime/internal/eh.d @ 494:29b901b6b346
Get rid of exception usage in exception handling code.
author | Christian Kamm <kamm incasoftware de> |
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date | Sun, 10 Aug 2008 21:57:29 +0200 |
parents | 44f08170f4ef |
children | d94655ccbe4d |
rev | line source |
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443
44f08170f4ef
Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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1 /** |
44f08170f4ef
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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2 * This module contains functions and structures required for |
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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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 linux only |
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13 version(X86) version(linux) version=X86_LINUX; |
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14 |
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15 private extern(C) void abort(); |
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16 private extern(C) int printf(char*, ...); |
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17 |
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18 // D runtime functions |
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19 extern(C) { |
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20 int _d_isbaseof(ClassInfo oc, ClassInfo c); |
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21 } |
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22 |
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23 // libunwind headers |
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24 extern(C) |
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25 { |
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26 enum _Unwind_Reason_Code |
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27 { |
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28 NO_REASON = 0, |
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29 FOREIGN_EXCEPTION_CAUGHT = 1, |
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30 FATAL_PHASE2_ERROR = 2, |
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31 FATAL_PHASE1_ERROR = 3, |
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32 NORMAL_STOP = 4, |
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33 END_OF_STACK = 5, |
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34 HANDLER_FOUND = 6, |
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35 INSTALL_CONTEXT = 7, |
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36 CONTINUE_UNWIND = 8 |
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37 } |
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38 |
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39 enum _Unwind_Action |
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40 { |
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41 SEARCH_PHASE = 1, |
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42 CLEANUP_PHASE = 2, |
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43 HANDLER_PHASE = 3, |
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44 FORCE_UNWIND = 4 |
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45 } |
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46 |
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47 alias void* _Unwind_Context_Ptr; |
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48 |
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49 alias void function(_Unwind_Reason_Code, _Unwind_Exception*) _Unwind_Exception_Cleanup_Fn; |
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50 |
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51 struct _Unwind_Exception |
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52 { |
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53 char[8] exception_class; |
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54 _Unwind_Exception_Cleanup_Fn exception_cleanup; |
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55 int private_1; |
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56 int private_2; |
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57 } |
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58 |
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59 version(X86_LINUX) |
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60 { |
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61 void _Unwind_Resume(_Unwind_Exception*); |
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62 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception*); |
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63 ulong _Unwind_GetLanguageSpecificData(_Unwind_Context_Ptr context); |
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64 ulong _Unwind_GetIP(_Unwind_Context_Ptr context); |
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65 ulong _Unwind_SetIP(_Unwind_Context_Ptr context, ulong new_value); |
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66 ulong _Unwind_SetGR(_Unwind_Context_Ptr context, int index, ulong new_value); |
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67 ulong _Unwind_GetRegionStart(_Unwind_Context_Ptr context); |
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68 } |
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69 else |
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70 { |
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71 // runtime calls these directly |
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72 void _Unwind_Resume(_Unwind_Exception*) |
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73 { |
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74 console("_Unwind_Resume is not implemented on this platform.\n"); |
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75 } |
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76 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception*) |
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77 { |
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78 console("_Unwind_RaiseException is not implemented on this platform.\n"); |
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79 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
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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 |
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85 // error and exit |
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86 extern(C) private void fatalerror(char* format, ...) |
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87 { |
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88 va_list args; |
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89 va_start(args, format); |
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90 printf("Fatal error in EH code: "); |
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91 printf(format, args); |
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92 abort(); |
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93 } |
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94 |
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95 |
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96 // helpers for reading certain DWARF data |
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97 private ubyte* get_uleb128(ubyte* addr, ref size_t res) |
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98 { |
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99 res = 0; |
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100 size_t bitsize = 0; |
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101 |
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102 // read as long as high bit is set |
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103 while(*addr & 0x80) { |
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104 res |= (*addr & 0x7f) << bitsize; |
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105 bitsize += 7; |
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106 addr += 1; |
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107 if(bitsize >= size_t.sizeof*8) |
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108 fatalerror("tried to read uleb128 that exceeded size of size_t"); |
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109 } |
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110 // read last |
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111 if(bitsize != 0 && *addr >= 1 << size_t.sizeof*8 - bitsize) |
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112 fatalerror("Fatal error in EH code: tried to read uleb128 that exceeded size of size_t"); |
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113 res |= (*addr) << bitsize; |
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114 |
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115 return addr + 1; |
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116 } |
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117 |
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118 private ubyte* get_sleb128(ubyte* addr, ref ptrdiff_t res) |
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119 { |
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120 res = 0; |
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121 size_t bitsize = 0; |
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122 |
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123 // read as long as high bit is set |
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124 while(*addr & 0x80) { |
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125 res |= (*addr & 0x7f) << bitsize; |
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126 bitsize += 7; |
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127 addr += 1; |
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128 if(bitsize >= size_t.sizeof*8) |
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129 fatalerror("tried to read sleb128 that exceeded size of size_t"); |
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130 } |
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131 // read last |
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132 if(bitsize != 0 && *addr >= 1 << size_t.sizeof*8 - bitsize) |
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133 fatalerror("tried to read sleb128 that exceeded size of size_t"); |
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134 res |= (*addr) << bitsize; |
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135 |
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136 // take care of sign |
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137 if(bitsize < size_t.sizeof*8 && ((*addr) & 0x40)) |
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138 res |= cast(ptrdiff_t)(-1) ^ ((1 << (bitsize+7)) - 1); |
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139 |
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140 return addr + 1; |
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141 } |
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142 |
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143 |
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144 // exception struct used by the runtime. |
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145 // _d_throw allocates a new instance and passes the address of its |
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146 // _Unwind_Exception member to the unwind call. The personality |
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147 // routine is then able to get the whole struct by looking at the data |
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148 // surrounding the unwind info. |
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149 struct _d_exception |
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150 { |
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151 Object exception_object; |
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152 _Unwind_Exception unwind_info; |
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153 } |
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154 |
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155 // the 8-byte string identifying the type of exception |
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156 // the first 4 are for vendor, the second 4 for language |
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157 //TODO: This may be the wrong way around |
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158 char[8] _d_exception_class = "LLDCD1\0\0"; |
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159 |
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160 |
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161 // |
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162 // x86 Linux specific implementation of personality function |
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163 // and helpers |
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164 // |
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165 version(X86_LINUX) |
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166 { |
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167 |
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168 // the personality routine gets called by the unwind handler and is responsible for |
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169 // reading the EH tables and deciding what to do |
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170 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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171 { |
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172 // check ver: the C++ Itanium ABI only allows ver == 1 |
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173 if(ver != 1) |
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174 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
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175 |
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176 // check exceptionClass |
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177 //TODO: Treat foreign exceptions with more respect |
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178 if((cast(char*)&exception_class)[0..8] != _d_exception_class) |
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179 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
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180 |
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181 // find call site table, action table and classinfo table |
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182 // Note: callsite and action tables do not contain static-length |
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183 // data and will be parsed as needed |
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184 // Note: classinfo_table points past the end of the table |
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185 ubyte* callsite_table; |
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186 ubyte* action_table; |
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187 ClassInfo* classinfo_table; |
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188 _d_getLanguageSpecificTables(context, callsite_table, action_table, classinfo_table); |
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189 |
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190 |
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191 /* |
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192 find landing pad and action table index belonging to ip by walking |
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193 the callsite_table |
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194 */ |
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195 ubyte* callsite_walker = callsite_table; |
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196 |
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197 // get the instruction pointer |
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198 // will be used to find the right entry in the callsite_table |
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199 // -1 because it will point past the last instruction |
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200 ulong ip = _Unwind_GetIP(context) - 1; |
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201 |
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202 // address block_start is relative to |
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203 ulong region_start = _Unwind_GetRegionStart(context); |
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204 |
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205 // table entries |
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206 uint block_start_offset, block_size; |
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207 ulong landing_pad; |
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208 size_t action_offset; |
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209 |
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210 while(true) { |
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211 // if we've gone through the list and found nothing... |
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212 if(callsite_walker >= action_table) |
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213 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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214 |
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215 block_start_offset = *cast(uint*)callsite_walker; |
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216 block_size = *(cast(uint*)callsite_walker + 1); |
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217 landing_pad = *(cast(uint*)callsite_walker + 2); |
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218 if(landing_pad) |
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219 landing_pad += region_start; |
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220 callsite_walker = get_uleb128(callsite_walker + 3*uint.sizeof, action_offset); |
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221 |
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222 debug(EH_personality_verbose) printf("%d %d %d\n", block_start_offset, block_size, landing_pad); |
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223 |
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224 // since the list is sorted, as soon as we're past the ip |
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225 // there's no handler to be found |
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226 if(ip < region_start + block_start_offset) |
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227 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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228 |
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229 // if we've found our block, exit |
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230 if(ip < region_start + block_start_offset + block_size) |
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231 break; |
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232 } |
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233 |
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234 debug(EH_personality) printf("Found correct landing pad and actionOffset %d\n", action_offset); |
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235 |
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236 // now we need the exception's classinfo to find a handler |
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237 // the exception_info is actually a member of a larger _d_exception struct |
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238 // the runtime allocated. get that now |
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239 _d_exception* exception_struct = cast(_d_exception*)(cast(ubyte*)exception_info - _d_exception.unwind_info.offsetof); |
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240 |
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241 // if there's no action offset and no landing pad, continue unwinding |
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242 if(!action_offset && !landing_pad) |
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243 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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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 return _d_eh_install_finally_context(actions, landing_pad, exception_struct, context); |
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248 |
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249 /* |
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250 walk action table chain, comparing classinfos using _d_isbaseof |
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251 */ |
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252 ubyte* action_walker = action_table + action_offset - 1; |
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253 |
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254 ptrdiff_t ti_offset, next_action_offset; |
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255 while(true) { |
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256 action_walker = get_sleb128(action_walker, ti_offset); |
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257 // it is intentional that we not modify action_walker here |
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258 // next_action_offset is from current action_walker position |
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259 get_sleb128(action_walker, next_action_offset); |
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260 |
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261 // negative are 'filters' which we don't use |
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262 if(!(ti_offset >= 0)) |
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263 fatalerror("Filter actions are unsupported"); |
443
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264 |
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265 // zero means cleanup, which we require to be the last action |
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266 if(ti_offset == 0) { |
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267 if(!(next_action_offset == 0)) |
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268 fatalerror("Cleanup action must be last in chain"); |
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269 return _d_eh_install_finally_context(actions, landing_pad, exception_struct, context); |
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270 } |
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271 |
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272 // get classinfo for action and check if the one in the |
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273 // exception structure is a base |
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274 ClassInfo catch_ci = classinfo_table[-ti_offset]; |
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275 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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276 if(_d_isbaseof(exception_struct.exception_object.classinfo, catch_ci)) |
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277 return _d_eh_install_catch_context(actions, ti_offset, landing_pad, exception_struct, context); |
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278 |
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279 // we've walked through all actions and found nothing... |
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280 if(next_action_offset == 0) |
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281 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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282 else |
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283 action_walker += next_action_offset; |
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284 } |
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285 |
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286 fatalerror("reached unreachable"); |
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287 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR; |
443
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288 } |
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289 |
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290 // These are the register numbers for SetGR that |
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291 // llvm's eh.exception and eh.selector intrinsics |
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292 // will pick up. |
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293 // Found by trial-and-error and probably platform dependent! |
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294 private int eh_exception_regno = 0; |
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295 private int eh_selector_regno = 2; |
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296 |
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297 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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298 { |
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299 debug(EH_personality) printf("Found catch clause!\n"); |
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300 |
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301 if(actions & _Unwind_Action.SEARCH_PHASE) |
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302 return _Unwind_Reason_Code.HANDLER_FOUND; |
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303 |
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304 else if(actions & _Unwind_Action.HANDLER_PHASE) |
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305 { |
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306 debug(EH_personality) printf("Setting switch value to: %d!\n", switchval); |
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307 _Unwind_SetGR(context, eh_exception_regno, cast(ulong)cast(void*)(exception_struct.exception_object)); |
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308 _Unwind_SetGR(context, eh_selector_regno, switchval); |
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309 _Unwind_SetIP(context, landing_pad); |
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310 return _Unwind_Reason_Code.INSTALL_CONTEXT; |
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311 } |
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312 |
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313 fatalerror("reached unreachable"); |
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314 return _Unwind_Reason_Code.FATAL_PHASE2_ERROR; |
443
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315 } |
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316 |
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317 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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318 { |
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319 // if we're merely in search phase, continue |
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320 if(actions & _Unwind_Action.SEARCH_PHASE) |
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321 return _Unwind_Reason_Code.CONTINUE_UNWIND; |
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322 |
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323 debug(EH_personality) printf("Calling cleanup routine...\n"); |
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324 |
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325 _Unwind_SetGR(context, eh_exception_regno, cast(ulong)exception_struct); |
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326 _Unwind_SetGR(context, eh_selector_regno, 0); |
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327 _Unwind_SetIP(context, landing_pad); |
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328 return _Unwind_Reason_Code.INSTALL_CONTEXT; |
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329 } |
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330 |
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331 private void _d_getLanguageSpecificTables(_Unwind_Context_Ptr context, ref ubyte* callsite, ref ubyte* action, ref ClassInfo* ci) |
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332 { |
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333 ubyte* data = cast(ubyte*)_Unwind_GetLanguageSpecificData(context); |
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334 |
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335 //TODO: Do proper DWARF reading here |
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336 if(*data++ != 0xff) |
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337 fatalerror("DWARF header has unexpected format 1"); |
443
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338 |
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339 if(*data++ != 0x00) |
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340 fatalerror("DWARF header has unexpected format 2"); |
443
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341 size_t cioffset; |
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342 data = get_uleb128(data, cioffset); |
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343 ci = cast(ClassInfo*)(data + cioffset); |
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344 |
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345 if(*data++ != 0x03) |
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346 fatalerror("DWARF header has unexpected format 3"); |
443
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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 |
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357 extern(C) void _d_throw_exception(Object e) |
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358 { |
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359 if (e !is null) |
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360 { |
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361 _d_exception* exc_struct = new _d_exception; |
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362 exc_struct.unwind_info.exception_class[] = _d_exception_class; |
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363 exc_struct.exception_object = e; |
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364 _Unwind_Reason_Code ret = _Unwind_RaiseException(&exc_struct.unwind_info); |
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365 console("_Unwind_RaiseException failed with reason code: ")(ret)("\n"); |
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366 } |
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367 abort(); |
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368 } |
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369 |
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370 extern(C) void _d_eh_resume_unwind(_d_exception* exception_struct) |
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371 { |
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372 _Unwind_Resume(&exception_struct.unwind_info); |
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373 } |