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1 // unwind-prot.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 #if defined (__GNUG__) |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #ifdef HAVE_CONFIG_H |
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29 #include <config.h> |
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30 #endif |
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31 |
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32 #include <stddef.h> |
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33 |
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34 #include "SLStack.h" |
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35 |
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36 #include "CMatrix.h" |
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37 |
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38 #include "unwind-prot.h" |
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39 #include "error.h" |
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40 #include "utils.h" |
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41 |
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42 unwind_elem::unwind_elem (void) |
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43 { |
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44 unwind_elem_tag = 0; |
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45 unwind_elem_fptr = 0; |
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46 unwind_elem_ptr = 0; |
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47 } |
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48 |
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49 unwind_elem::unwind_elem (char *t) |
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50 { |
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51 unwind_elem_tag = strsave (t); |
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52 unwind_elem_fptr = 0; |
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53 unwind_elem_ptr = 0; |
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54 } |
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55 |
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56 unwind_elem::unwind_elem (cleanup_func f, void *p) |
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57 { |
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58 unwind_elem_tag = 0; |
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59 unwind_elem_fptr = f; |
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60 unwind_elem_ptr = p; |
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61 } |
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62 |
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63 unwind_elem::unwind_elem (const unwind_elem& el) |
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64 { |
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65 unwind_elem_tag = strsave (el.unwind_elem_tag); |
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66 unwind_elem_fptr = el.unwind_elem_fptr; |
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67 unwind_elem_ptr = el.unwind_elem_ptr; |
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68 } |
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69 |
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70 unwind_elem::~unwind_elem (void) |
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71 { |
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72 delete [] unwind_elem_tag; |
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73 } |
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74 |
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75 unwind_elem& |
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76 unwind_elem::operator = (const unwind_elem& el) |
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77 { |
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78 unwind_elem_tag = strsave (el.unwind_elem_tag); |
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79 unwind_elem_fptr = el.unwind_elem_fptr; |
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80 unwind_elem_ptr = el.unwind_elem_ptr; |
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81 |
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82 return *this; |
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83 } |
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84 |
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85 char * |
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86 unwind_elem::tag (void) |
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87 { |
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88 return unwind_elem_tag; |
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89 } |
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90 |
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91 cleanup_func |
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92 unwind_elem::fptr (void) |
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93 { |
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94 return unwind_elem_fptr; |
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95 } |
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96 |
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97 void * |
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98 unwind_elem::ptr (void) |
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99 { |
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100 return unwind_elem_ptr; |
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101 } |
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102 |
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103 static SLStack <unwind_elem> unwind_protect_list; |
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104 |
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105 void |
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106 add_unwind_protect (cleanup_func fptr, void *ptr) |
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107 { |
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108 unwind_elem el (fptr, ptr); |
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109 unwind_protect_list.push (el); |
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110 } |
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111 |
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112 void |
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113 run_unwind_protect (void) |
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114 { |
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115 unwind_elem el = unwind_protect_list.pop (); |
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116 |
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117 cleanup_func f = el.fptr (); |
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118 if (f) |
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119 f (el.ptr ()); |
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120 } |
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121 |
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122 void |
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123 discard_unwind_protect (void) |
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124 { |
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125 unwind_protect_list.pop (); |
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126 } |
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127 |
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128 void |
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129 begin_unwind_frame (char *tag) |
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130 { |
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131 unwind_elem elem (tag); |
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132 unwind_protect_list.push (elem); |
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133 } |
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134 |
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135 void |
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136 run_unwind_frame (char *tag) |
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137 { |
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138 while (! unwind_protect_list.empty ()) |
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139 { |
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140 unwind_elem el = unwind_protect_list.pop (); |
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141 |
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142 cleanup_func f = el.fptr (); |
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143 if (f) |
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144 f (el.ptr ()); |
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145 |
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146 char *t = el.tag (); |
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147 if (t && strcmp (t, tag) == 0) |
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148 break; |
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149 } |
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150 } |
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151 |
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152 void |
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153 discard_unwind_frame (char *tag) |
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154 { |
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155 while (! unwind_protect_list.empty ()) |
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156 { |
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157 unwind_elem el = unwind_protect_list.pop (); |
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158 char *t = el.tag (); |
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159 if (t && strcmp (t, tag) == 0) |
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160 break; |
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161 } |
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162 } |
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163 |
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164 void |
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165 run_all_unwind_protects (void) |
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166 { |
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167 while (! unwind_protect_list.empty ()) |
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168 { |
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169 unwind_elem el = unwind_protect_list.pop (); |
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170 |
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171 cleanup_func f = el.fptr (); |
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172 if (f) |
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173 f (el.ptr ()); |
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174 } |
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175 } |
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176 |
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177 void |
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178 discard_all_unwind_protects (void) |
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179 { |
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180 unwind_protect_list.clear (); |
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181 } |
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182 |
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183 void |
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184 matrix_cleanup (void *m) |
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185 { |
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186 delete [] (double *) m; |
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187 } |
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188 |
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189 void |
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190 complex_matrix_cleanup (void *cm) |
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191 { |
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192 delete [] (ComplexMatrix *) cm; |
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193 } |
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194 |
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195 class saved_variable |
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196 { |
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197 public: |
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198 enum var_type { integer, generic_ptr, generic }; |
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199 |
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200 saved_variable (void); |
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201 saved_variable (int *p, int v); |
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202 saved_variable (void **p, void *v); |
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203 saved_variable (void *p, void *v, size_t sz); |
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204 ~saved_variable (void); |
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205 |
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206 void restore_value (void); |
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207 |
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208 private: |
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209 union |
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210 { |
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211 int *ptr_to_int; |
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212 void *gen_ptr; |
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213 void **ptr_to_gen_ptr; |
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214 }; |
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215 |
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216 union |
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217 { |
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218 int int_value; |
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219 void *gen_ptr_value; |
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220 }; |
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221 |
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222 var_type type_tag; |
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223 size_t size; |
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224 }; |
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225 |
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226 saved_variable::saved_variable (void) |
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227 { |
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228 gen_ptr = 0; |
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229 gen_ptr_value = 0; |
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230 type_tag = generic; |
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231 size = 0; |
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232 } |
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233 |
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234 saved_variable::saved_variable (int *p, int v) |
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235 { |
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236 type_tag = integer; |
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237 ptr_to_int = p; |
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238 int_value = v; |
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239 size = sizeof (int); |
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240 } |
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241 |
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242 saved_variable::saved_variable (void **p, void *v) |
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243 { |
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244 type_tag = generic_ptr; |
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245 ptr_to_gen_ptr = p; |
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246 gen_ptr_value = v; |
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247 size = sizeof (void *); |
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248 } |
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249 |
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250 saved_variable::saved_variable (void *p, void *v, size_t sz) |
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251 { |
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252 gen_ptr = v; |
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253 gen_ptr_value = new char [sz]; |
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254 memcpy (gen_ptr_value, v, sz); |
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255 size = sz; |
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256 } |
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257 |
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258 saved_variable::~saved_variable (void) |
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259 { |
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260 if (type_tag == generic) |
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261 delete [] gen_ptr_value; |
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262 } |
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263 |
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264 void |
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265 saved_variable::restore_value (void) |
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266 { |
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267 switch (type_tag) |
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268 { |
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269 case integer: |
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270 *ptr_to_int = int_value; |
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271 break; |
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272 |
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273 case generic_ptr: |
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274 *ptr_to_gen_ptr = gen_ptr_value; |
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275 break; |
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276 |
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277 case generic: |
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278 memcpy (gen_ptr, gen_ptr_value, size); |
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279 break; |
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280 |
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281 default: |
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282 panic_impossible (); |
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283 break; |
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284 } |
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285 } |
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286 |
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287 static void |
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288 restore_saved_variable (void *s) |
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289 { |
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290 saved_variable *sv = (saved_variable *) s; |
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291 sv->restore_value (); |
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292 delete sv; |
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293 } |
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294 |
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295 void |
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296 unwind_protect_int_internal (int *ptr, int value) |
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297 { |
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298 saved_variable *s = new saved_variable (ptr, value); |
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299 add_unwind_protect (restore_saved_variable, (void *) s); |
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300 } |
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301 |
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302 void |
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303 unwind_protect_ptr_internal (void **ptr, void *value) |
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304 { |
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305 saved_variable *s = new saved_variable (ptr, value); |
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306 add_unwind_protect (restore_saved_variable, (void *) s); |
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307 } |
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308 |
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309 void |
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310 unwind_protect_var_internal (void *ptr, void *value, size_t size) |
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311 { |
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312 saved_variable *s = new saved_variable (ptr, value, size); |
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313 add_unwind_protect (restore_saved_variable, (void *) s); |
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314 } |
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315 |
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316 /* |
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317 ;;; Local Variables: *** |
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318 ;;; mode: C++ *** |
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319 ;;; page-delimiter: "^/\\*" *** |
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320 ;;; End: *** |
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321 */ |
