Mercurial > projects > ldc
annotate runtime/internal/eh.d @ 733:cc8ba72c0350
Nested access to with statement should work now. fixes #105
author | Tomas Lindquist Olsen <tomas.l.olsen@gmail.com> |
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date | Mon, 27 Oct 2008 01:40:47 +0100 |
parents | 6aaa3d3c1183 |
children | 4ac97ec7c18e |
rev | line source |
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443
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1 /** |
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2 * This module contains functions and structures required for |
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3 * exception handling. |
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4 */ |
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5 module eh; |
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6 |
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7 import util.console; |
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8 import ldc.cstdarg; |
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9 |
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10 // debug = EH_personality; |
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11 |
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12 // current EH implementation works on x86 |
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13 // if it has a working unwind runtime |
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14 version(X86) { |
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15 version(linux) version=X86_UNWIND; |
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16 version(darwin) version=X86_UNWIND; |
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17 } |
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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) |
443
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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 } |