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annotate druntime/src/compiler/dmd/deh2.d @ 759:d3eb054172f9

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Added copy of druntime from DMD 2.020 modified for LDC.
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Tue, 11 Nov 2008 01:52:37 +0100
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759
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1 /*
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2 * Copyright (C) 1999-2005 by Digital Mars, www.digitalmars.com
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3 * Written by Walter Bright
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4 *
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5 * This software is provided 'as-is', without any express or implied
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6 * warranty. In no event will the authors be held liable for any damages
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7 * arising from the use of this software.
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8 *
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9 * Permission is granted to anyone to use this software for any purpose,
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10 * including commercial applications, and to alter it and redistribute it
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11 * freely, in both source and binary form, subject to the following
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12 * restrictions:
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13 *
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14 * o The origin of this software must not be misrepresented; you must not
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15 * claim that you wrote the original software. If you use this software
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16 * in a product, an acknowledgment in the product documentation would be
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17 * appreciated but is not required.
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18 * o Altered source versions must be plainly marked as such, and must not
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19 * be misrepresented as being the original software.
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20 * o This notice may not be removed or altered from any source
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21 * distribution.
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22 */
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23
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24 module rt.deh2;
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25
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26 // Exception handling support for linux
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27
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28 //debug=1;
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29
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30 extern (C)
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31 {
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32 extern void* _deh_beg;
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33 extern void* _deh_end;
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34
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35 int _d_isbaseof(ClassInfo oc, ClassInfo c);
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36 }
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37
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38 alias int (*fp_t)(); // function pointer in ambient memory model
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39
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40 struct DHandlerInfo
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41 {
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42 uint offset; // offset from function address to start of guarded section
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43 uint endoffset; // offset of end of guarded section
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44 int prev_index; // previous table index
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45 uint cioffset; // offset to DCatchInfo data from start of table (!=0 if try-catch)
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46 void *finally_code; // pointer to finally code to execute
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47 // (!=0 if try-finally)
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48 }
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49
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50 // Address of DHandlerTable, searched for by eh_finddata()
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51
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52 struct DHandlerTable
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53 {
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54 void *fptr; // pointer to start of function
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55 uint espoffset; // offset of ESP from EBP
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56 uint retoffset; // offset from start of function to return code
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57 uint nhandlers; // dimension of handler_info[]
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58 DHandlerInfo handler_info[1];
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59 }
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60
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61 struct DCatchBlock
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62 {
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63 ClassInfo type; // catch type
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64 uint bpoffset; // EBP offset of catch var
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65 void *code; // catch handler code
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66 }
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67
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68 // Create one of these for each try-catch
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69 struct DCatchInfo
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70 {
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71 uint ncatches; // number of catch blocks
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72 DCatchBlock catch_block[1]; // data for each catch block
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73 }
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74
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75 // One of these is generated for each function with try-catch or try-finally
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76
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77 struct FuncTable
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78 {
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79 void *fptr; // pointer to start of function
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80 DHandlerTable *handlertable; // eh data for this function
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81 uint fsize; // size of function in bytes
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82 }
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83
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84 void terminate()
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85 {
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86 asm
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87 {
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88 hlt ;
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89 }
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90 }
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91
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92 /*******************************************
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93 * Given address that is inside a function,
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94 * figure out which function it is in.
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95 * Return DHandlerTable if there is one, NULL if not.
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96 */
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97
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98 DHandlerTable *__eh_finddata(void *address)
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99 {
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100 FuncTable *ft;
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101
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102 // debug printf("__eh_finddata(address = x%x)\n", address);
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103 // debug printf("_deh_beg = x%x, _deh_end = x%x\n", &_deh_beg, &_deh_end);
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104 for (ft = cast(FuncTable *)&_deh_beg;
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105 ft < cast(FuncTable *)&_deh_end;
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106 ft++)
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107 {
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108 // debug printf("\tfptr = x%x, fsize = x%03x, handlertable = x%x\n",
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109 // ft.fptr, ft.fsize, ft.handlertable);
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110
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111 if (ft.fptr <= address &&
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112 address < cast(void *)(cast(char *)ft.fptr + ft.fsize))
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113 {
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114 // debug printf("\tfound handler table\n");
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115 return ft.handlertable;
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116 }
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117 }
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118 // debug printf("\tnot found\n");
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119 return null;
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120 }
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121
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122
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123 /******************************
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124 * Given EBP, find return address to caller, and caller's EBP.
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125 * Input:
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126 * regbp Value of EBP for current function
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127 * *pretaddr Return address
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128 * Output:
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129 * *pretaddr return address to caller
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130 * Returns:
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131 * caller's EBP
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132 */
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133
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134 uint __eh_find_caller(uint regbp, uint *pretaddr)
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135 {
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136 uint bp = *cast(uint *)regbp;
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137
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138 if (bp) // if not end of call chain
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139 {
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140 // Perform sanity checks on new EBP.
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141 // If it is screwed up, terminate() hopefully before we do more damage.
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142 if (bp <= regbp)
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143 // stack should grow to smaller values
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144 terminate();
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145
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146 *pretaddr = *cast(uint *)(regbp + int.sizeof);
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147 }
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148 return bp;
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149 }
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150
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151 /***********************************
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152 * Throw a D object.
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153 */
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154
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155 extern (Windows) void _d_throw(Object *h)
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156 {
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157 uint regebp;
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158
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159 debug
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160 {
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161 printf("_d_throw(h = %p, &h = %p)\n", h, &h);
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162 printf("\tvptr = %p\n", *cast(void **)h);
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163 }
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164
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165 asm
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166 {
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167 mov regebp,EBP ;
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168 }
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169
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170 //static uint abc;
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171 //if (++abc == 2) *(char *)0=0;
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172
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173 //int count = 0;
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174 while (1) // for each function on the stack
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175 {
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176 DHandlerTable *handler_table;
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177 FuncTable *pfunc;
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178 DHandlerInfo *phi;
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179 uint retaddr;
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180 uint funcoffset;
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181 uint spoff;
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182 uint retoffset;
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183 int index;
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184 int dim;
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185 int ndx;
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186 int prev_ndx;
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187
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188 regebp = __eh_find_caller(regebp,&retaddr);
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189 if (!regebp)
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190 { // if end of call chain
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191 debug printf("end of call chain\n");
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192 break;
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193 }
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194
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195 debug printf("found caller, EBP = x%x, retaddr = x%x\n", regebp, retaddr);
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196 //if (++count == 12) *(char*)0=0;
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197 handler_table = __eh_finddata(cast(void *)retaddr); // find static data associated with function
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198 if (!handler_table) // if no static data
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199 {
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200 debug printf("no handler table\n");
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201 continue;
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202 }
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203 funcoffset = cast(uint)handler_table.fptr;
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204 spoff = handler_table.espoffset;
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205 retoffset = handler_table.retoffset;
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206
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207 debug
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208 {
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209 printf("retaddr = x%x\n",cast(uint)retaddr);
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210 printf("regebp=x%04x, funcoffset=x%04x, spoff=x%x, retoffset=x%x\n",
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211 regebp,funcoffset,spoff,retoffset);
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212 }
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213
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214 // Find start index for retaddr in static data
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215 dim = handler_table.nhandlers;
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216
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217 debug
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218 {
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219 printf("handler_info[]:\n");
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220 for (int i = 0; i < dim; i++)
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221 {
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222 phi = &handler_table.handler_info[i];
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223 printf("\t[%d]: offset = x%04x, endoffset = x%04x, prev_index = %d, cioffset = x%04x, finally_code = %x\n",
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224 i, phi.offset, phi.endoffset, phi.prev_index, phi.cioffset, phi.finally_code);
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225 }
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226 }
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227
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228 index = -1;
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229 for (int i = 0; i < dim; i++)
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230 {
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231 phi = &handler_table.handler_info[i];
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232
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233 debug printf("i = %d, phi.offset = %04x\n", i, funcoffset + phi.offset);
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234 if (cast(uint)retaddr > funcoffset + phi.offset &&
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235 cast(uint)retaddr <= funcoffset + phi.endoffset)
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236 index = i;
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237 }
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238 debug printf("index = %d\n", index);
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239
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240 // walk through handler table, checking each handler
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241 // with an index smaller than the current table_index
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242 for (ndx = index; ndx != -1; ndx = prev_ndx)
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243 {
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244 phi = &handler_table.handler_info[ndx];
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245 prev_ndx = phi.prev_index;
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246 if (phi.cioffset)
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247 {
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248 // this is a catch handler (no finally)
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249 DCatchInfo *pci;
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250 int ncatches;
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251 int i;
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252
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253 pci = cast(DCatchInfo *)(cast(char *)handler_table + phi.cioffset);
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254 ncatches = pci.ncatches;
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255 for (i = 0; i < ncatches; i++)
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256 {
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257 DCatchBlock *pcb;
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258 ClassInfo ci = **cast(ClassInfo **)h;
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259
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260 pcb = &pci.catch_block[i];
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261
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262 if (_d_isbaseof(ci, pcb.type))
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263 { // Matched the catch type, so we've found the handler.
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264
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265 // Initialize catch variable
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266 *cast(void **)(regebp + (pcb.bpoffset)) = h;
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267
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268 // Jump to catch block. Does not return.
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269 {
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270 uint catch_esp;
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271 fp_t catch_addr;
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272
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273 catch_addr = cast(fp_t)(pcb.code);
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274 catch_esp = regebp - handler_table.espoffset - fp_t.sizeof;
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275 asm
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276 {
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277 mov EAX,catch_esp ;
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278 mov ECX,catch_addr ;
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279 mov [EAX],ECX ;
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280 mov EBP,regebp ;
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281 mov ESP,EAX ; // reset stack
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282 ret ; // jump to catch block
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283 }
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284 }
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285 }
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286 }
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287 }
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288 else if (phi.finally_code)
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289 { // Call finally block
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290 // Note that it is unnecessary to adjust the ESP, as the finally block
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291 // accesses all items on the stack as relative to EBP.
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292
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293 void *blockaddr = phi.finally_code;
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294
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295 asm
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296 {
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297 push EBX ;
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298 mov EBX,blockaddr ;
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299 push EBP ;
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300 mov EBP,regebp ;
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301 call EBX ;
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302 pop EBP ;
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303 pop EBX ;
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304 }
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305 }
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306 }
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307 }
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308 }