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annotate runtime/internal/eh.d @ 897:c6f16c3f377b

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Fix x86-64 exception handling #180. Thanks pcwalton!
author Christian Kamm <kamm incasoftware de>
date Thu, 22 Jan 2009 17:50:38 +0100
parents fb4853c46917
children db3f8e7d79d2
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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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7 import util.console;
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8 import ldc.cstdarg;
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10 // debug = EH_personality;
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11
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12 // current EH implementation works on x86
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13 // if it has a working unwind runtime
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14 version(X86) {
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15 version(linux) version=X86_UNWIND;
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16 version(darwin) version=X86_UNWIND;
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17 version(solaris) version=X86_UNWIND;
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18 }
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19 version(X86_64) {
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20 version(linux) version=X86_UNWIND;
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21 version(solaris) version=X86_UNWIND;
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22 }
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24 private extern(C) void abort();
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25 private extern(C) int printf(char*, ...);
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26 private extern(C) int vprintf(char*, va_list va);
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28 // D runtime functions
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29 extern(C) {
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30 int _d_isbaseof(ClassInfo oc, ClassInfo c);
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31 }
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32
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33 // libunwind headers
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34 extern(C)
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35 {
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36 enum _Unwind_Reason_Code
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37 {
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38 NO_REASON = 0,
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39 FOREIGN_EXCEPTION_CAUGHT = 1,
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40 FATAL_PHASE2_ERROR = 2,
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41 FATAL_PHASE1_ERROR = 3,
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42 NORMAL_STOP = 4,
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43 END_OF_STACK = 5,
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44 HANDLER_FOUND = 6,
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45 INSTALL_CONTEXT = 7,
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46 CONTINUE_UNWIND = 8
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47 }
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48
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49 enum _Unwind_Action
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50 {
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51 SEARCH_PHASE = 1,
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52 CLEANUP_PHASE = 2,
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53 HANDLER_PHASE = 3,
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54 FORCE_UNWIND = 4
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55 }
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56
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57 alias void* _Unwind_Context_Ptr;
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58
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59 alias void function(_Unwind_Reason_Code, _Unwind_Exception*) _Unwind_Exception_Cleanup_Fn;
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60
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61 struct _Unwind_Exception
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62 {
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63 char[8] exception_class;
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64 _Unwind_Exception_Cleanup_Fn exception_cleanup;
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65 ptrdiff_t private_1;
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66 ptrdiff_t private_2;
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67 }
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68
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69 version(X86_UNWIND)
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70 {
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71 void _Unwind_Resume(_Unwind_Exception*);
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72 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception*);
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73 ptrdiff_t _Unwind_GetLanguageSpecificData(_Unwind_Context_Ptr context);
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74 ptrdiff_t _Unwind_GetIP(_Unwind_Context_Ptr context);
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75 ptrdiff_t _Unwind_SetIP(_Unwind_Context_Ptr context, ptrdiff_t new_value);
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76 ptrdiff_t _Unwind_SetGR(_Unwind_Context_Ptr context, int index,
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77 ptrdiff_t new_value);
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78 ptrdiff_t _Unwind_GetRegionStart(_Unwind_Context_Ptr context);
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79 }
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80 else
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81 {
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82 // runtime calls these directly
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83 void _Unwind_Resume(_Unwind_Exception*)
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84 {
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85 console("_Unwind_Resume is not implemented on this platform.\n");
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86 }
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87 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception*)
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88 {
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89 console("_Unwind_RaiseException is not implemented on this platform.\n");
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90 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR;
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91 }
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92 }
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93
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94 }
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95
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96 // error and exit
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97 extern(C) private void fatalerror(char* format, ...)
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98 {
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99 va_list args;
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100 va_start(args, format);
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101 printf("Fatal error in EH code: ");
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102 vprintf(format, args);
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103 printf("\n");
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104 abort();
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105 }
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106
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107
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108 // helpers for reading certain DWARF data
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109 private ubyte* get_uleb128(ubyte* addr, ref size_t res)
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110 {
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111 res = 0;
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112 size_t bitsize = 0;
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113
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114 // read as long as high bit is set
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115 while(*addr & 0x80) {
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116 res |= (*addr & 0x7f) << bitsize;
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117 bitsize += 7;
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118 addr += 1;
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119 if(bitsize >= size_t.sizeof*8)
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120 fatalerror("tried to read uleb128 that exceeded size of size_t");
443
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121 }
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122 // read last
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123 if(bitsize != 0 && *addr >= 1 << size_t.sizeof*8 - bitsize)
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124 fatalerror("Fatal error in EH code: tried to read uleb128 that exceeded size of size_t");
443
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125 res |= (*addr) << bitsize;
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126
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127 return addr + 1;
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128 }
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129
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130 private ubyte* get_sleb128(ubyte* addr, ref ptrdiff_t res)
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131 {
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132 res = 0;
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133 size_t bitsize = 0;
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134
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135 // read as long as high bit is set
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136 while(*addr & 0x80) {
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137 res |= (*addr & 0x7f) << bitsize;
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138 bitsize += 7;
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139 addr += 1;
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140 if(bitsize >= size_t.sizeof*8)
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141 fatalerror("tried to read sleb128 that exceeded size of size_t");
443
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142 }
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143 // read last
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144 if(bitsize != 0 && *addr >= 1 << size_t.sizeof*8 - bitsize)
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145 fatalerror("tried to read sleb128 that exceeded size of size_t");
443
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146 res |= (*addr) << bitsize;
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147
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148 // take care of sign
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149 if(bitsize < size_t.sizeof*8 && ((*addr) & 0x40))
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150 res |= cast(ptrdiff_t)(-1) ^ ((1 << (bitsize+7)) - 1);
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151
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152 return addr + 1;
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153 }
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154
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155
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156 // exception struct used by the runtime.
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157 // _d_throw allocates a new instance and passes the address of its
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158 // _Unwind_Exception member to the unwind call. The personality
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159 // routine is then able to get the whole struct by looking at the data
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160 // surrounding the unwind info.
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161 struct _d_exception
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162 {
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163 Object exception_object;
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164 _Unwind_Exception unwind_info;
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165 }
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166
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167 // the 8-byte string identifying the type of exception
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168 // the first 4 are for vendor, the second 4 for language
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169 //TODO: This may be the wrong way around
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170 char[8] _d_exception_class = "LLDCD1\0\0";
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171
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172
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173 //
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174 // x86 unwind specific implementation of personality function
443
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175 // and helpers
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176 //
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177 version(X86_UNWIND)
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178 {
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179
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180 // the personality routine gets called by the unwind handler and is responsible for
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181 // reading the EH tables and deciding what to do
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182 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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183 {
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184 // check ver: the C++ Itanium ABI only allows ver == 1
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185 if(ver != 1)
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186 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR;
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187
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188 // check exceptionClass
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189 //TODO: Treat foreign exceptions with more respect
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190 if((cast(char*)&exception_class)[0..8] != _d_exception_class)
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191 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR;
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192
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193 // find call site table, action table and classinfo table
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194 // Note: callsite and action tables do not contain static-length
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195 // data and will be parsed as needed
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196 // Note: classinfo_table points past the end of the table
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197 ubyte* callsite_table;
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198 ubyte* action_table;
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199 ClassInfo* classinfo_table;
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200 _d_getLanguageSpecificTables(context, callsite_table, action_table, classinfo_table);
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201
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202
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203 /*
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204 find landing pad and action table index belonging to ip by walking
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205 the callsite_table
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206 */
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207 ubyte* callsite_walker = callsite_table;
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208
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209 // get the instruction pointer
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210 // will be used to find the right entry in the callsite_table
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211 // -1 because it will point past the last instruction
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212 ptrdiff_t ip = _Unwind_GetIP(context) - 1;
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213
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214 // address block_start is relative to
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215 ptrdiff_t region_start = _Unwind_GetRegionStart(context);
443
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216
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217 // table entries
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218 uint block_start_offset, block_size;
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219 ptrdiff_t landing_pad;
443
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220 size_t action_offset;
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221
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222 while(true) {
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223 // if we've gone through the list and found nothing...
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224 if(callsite_walker >= action_table)
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225 return _Unwind_Reason_Code.CONTINUE_UNWIND;
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226
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227 block_start_offset = *cast(uint*)callsite_walker;
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228 block_size = *(cast(uint*)callsite_walker + 1);
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229 landing_pad = *(cast(uint*)callsite_walker + 2);
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230 if(landing_pad)
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231 landing_pad += region_start;
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232 callsite_walker = get_uleb128(callsite_walker + 3*uint.sizeof, action_offset);
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233
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234 debug(EH_personality_verbose) printf("ip=%llx %d %d %llx\n", ip, block_start_offset, block_size, landing_pad);
443
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235
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236 // since the list is sorted, as soon as we're past the ip
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237 // there's no handler to be found
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238 if(ip < region_start + block_start_offset)
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239 return _Unwind_Reason_Code.CONTINUE_UNWIND;
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240
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241 // if we've found our block, exit
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242 if(ip < region_start + block_start_offset + block_size)
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243 break;
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244 }
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245
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246 debug(EH_personality) printf("Found correct landing pad and actionOffset %d\n", action_offset);
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247
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248 // now we need the exception's classinfo to find a handler
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249 // the exception_info is actually a member of a larger _d_exception struct
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250 // the runtime allocated. get that now
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251 _d_exception* exception_struct = cast(_d_exception*)(cast(ubyte*)exception_info - _d_exception.unwind_info.offsetof);
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252
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253 // if there's no action offset and no landing pad, continue unwinding
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254 if(!action_offset && !landing_pad)
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255 return _Unwind_Reason_Code.CONTINUE_UNWIND;
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256
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257 // if there's no action offset but a landing pad, this is a cleanup handler
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258 else if(!action_offset && landing_pad)
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259 return _d_eh_install_finally_context(actions, landing_pad, exception_struct, context);
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260
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261 /*
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262 walk action table chain, comparing classinfos using _d_isbaseof
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263 */
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264 ubyte* action_walker = action_table + action_offset - 1;
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265
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266 ptrdiff_t ti_offset, next_action_offset;
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267 while(true) {
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268 action_walker = get_sleb128(action_walker, ti_offset);
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269 // it is intentional that we not modify action_walker here
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270 // next_action_offset is from current action_walker position
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271 get_sleb128(action_walker, next_action_offset);
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272
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273 // negative are 'filters' which we don't use
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274 if(!(ti_offset >= 0))
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275 fatalerror("Filter actions are unsupported");
443
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276
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277 // zero means cleanup, which we require to be the last action
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278 if(ti_offset == 0) {
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279 if(!(next_action_offset == 0))
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280 fatalerror("Cleanup action must be last in chain");
443
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281 return _d_eh_install_finally_context(actions, landing_pad, exception_struct, context);
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282 }
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283
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284 // get classinfo for action and check if the one in the
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285 // exception structure is a base
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286 ClassInfo catch_ci = *(classinfo_table - ti_offset);
443
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287 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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288 if(_d_isbaseof(exception_struct.exception_object.classinfo, catch_ci))
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289 return _d_eh_install_catch_context(actions, ti_offset, landing_pad, exception_struct, context);
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290
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291 // we've walked through all actions and found nothing...
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292 if(next_action_offset == 0)
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293 return _Unwind_Reason_Code.CONTINUE_UNWIND;
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294 else
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295 action_walker += next_action_offset;
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296 }
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297
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298 fatalerror("reached unreachable");
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299 return _Unwind_Reason_Code.FATAL_PHASE1_ERROR;
443
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300 }
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301
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302 // These are the register numbers for SetGR that
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303 // llvm's eh.exception and eh.selector intrinsics
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304 // will pick up.
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305 // Hints for these can be found by looking at the
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306 // EH_RETURN_DATA_REGNO macro in GCC, careful testing
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307 // is required though.
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308 version (X86_64)
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309 {
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310 private int eh_exception_regno = 0;
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311 private int eh_selector_regno = 1;
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312 } else {
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313 private int eh_exception_regno = 0;
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314 private int eh_selector_regno = 2;
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315 }
443
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316
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317 private _Unwind_Reason_Code _d_eh_install_catch_context(_Unwind_Action actions, ptrdiff_t switchval, ptrdiff_t landing_pad, _d_exception* exception_struct, _Unwind_Context_Ptr context)
443
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318 {
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319 debug(EH_personality) printf("Found catch clause!\n");
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320
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321 if(actions & _Unwind_Action.SEARCH_PHASE)
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322 return _Unwind_Reason_Code.HANDLER_FOUND;
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323
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324 else if(actions & _Unwind_Action.HANDLER_PHASE)
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325 {
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326 debug(EH_personality) printf("Setting switch value to: %d!\n", switchval);
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327 _Unwind_SetGR(context, eh_exception_regno, cast(ptrdiff_t)cast(void*)(exception_struct.exception_object));
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328 _Unwind_SetGR(context, eh_selector_regno, cast(ptrdiff_t)switchval);
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329 _Unwind_SetIP(context, landing_pad);
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330 return _Unwind_Reason_Code.INSTALL_CONTEXT;
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331 }
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332
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333 fatalerror("reached unreachable");
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334 return _Unwind_Reason_Code.FATAL_PHASE2_ERROR;
443
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335 }
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336
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337 private _Unwind_Reason_Code _d_eh_install_finally_context(_Unwind_Action actions, ptrdiff_t landing_pad, _d_exception* exception_struct, _Unwind_Context_Ptr context)
443
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338 {
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339 // if we're merely in search phase, continue
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340 if(actions & _Unwind_Action.SEARCH_PHASE)
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341 return _Unwind_Reason_Code.CONTINUE_UNWIND;
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342
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343 debug(EH_personality) printf("Calling cleanup routine...\n");
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344
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345 _Unwind_SetGR(context, eh_exception_regno, cast(ptrdiff_t)exception_struct);
443
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346 _Unwind_SetGR(context, eh_selector_regno, 0);
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347 _Unwind_SetIP(context, landing_pad);
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348 return _Unwind_Reason_Code.INSTALL_CONTEXT;
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349 }
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350
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351 private void _d_getLanguageSpecificTables(_Unwind_Context_Ptr context, ref ubyte* callsite, ref ubyte* action, ref ClassInfo* ci)
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352 {
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353 ubyte* data = cast(ubyte*)_Unwind_GetLanguageSpecificData(context);
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354
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355 //TODO: Do proper DWARF reading here
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356 if(*data++ != 0xff)
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357 fatalerror("DWARF header has unexpected format 1");
443
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358
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359 if(*data++ != 0x00)
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360 fatalerror("DWARF header has unexpected format 2");
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361 size_t cioffset;
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362 data = get_uleb128(data, cioffset);
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363 ci = cast(ClassInfo*)(data + cioffset);
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364
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365 if(*data++ != 0x03)
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366 fatalerror("DWARF header has unexpected format 3");
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367 size_t callsitelength;
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368 data = get_uleb128(data, callsitelength);
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369 action = data + callsitelength;
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370
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371 callsite = data;
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372 }
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373
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374 } // end of x86 Linux specific implementation
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375
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376
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377 extern(C) void _d_throw_exception(Object e)
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378 {
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379 if (e !is null)
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380 {
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381 _d_exception* exc_struct = new _d_exception;
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382 exc_struct.unwind_info.exception_class[] = _d_exception_class;
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383 exc_struct.exception_object = e;
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384 _Unwind_Reason_Code ret = _Unwind_RaiseException(&exc_struct.unwind_info);
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385 console("_Unwind_RaiseException failed with reason code: ")(ret)("\n");
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386 }
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387 abort();
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388 }
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389
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390 extern(C) void _d_eh_resume_unwind(_d_exception* exception_struct)
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391 {
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392 _Unwind_Resume(&exception_struct.unwind_info);
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393 }