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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if defined (__GNUG__) |
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24 #pragma implementation |
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25 #endif |
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26 |
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27 #ifdef HAVE_CONFIG_H |
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28 #include <config.h> |
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29 #endif |
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30 |
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31 #include <cstddef> |
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32 |
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33 #include <string> |
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34 |
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35 #include "SLStack.h" |
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36 |
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37 #include "CMatrix.h" |
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38 |
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39 #include "error.h" |
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40 #include "unwind-prot.h" |
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41 #include "utils.h" |
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42 |
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43 SLStack<unwind_elem> unwind_protect::list; |
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44 |
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45 class |
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46 saved_variable |
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47 { |
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48 public: |
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49 |
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50 enum var_type |
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51 { |
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52 boolean, |
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53 integer, |
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54 string_type, |
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55 generic_ptr, |
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56 generic |
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57 }; |
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58 |
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59 saved_variable (void); |
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60 |
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61 saved_variable (bool *p, bool v); |
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62 |
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63 saved_variable (int *p, int v); |
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64 |
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65 saved_variable (string *p, const string& v); |
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66 |
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67 saved_variable (void **p, void *v); |
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68 |
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69 ~saved_variable (void); |
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70 |
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71 void restore_value (void); |
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72 |
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73 static void restore (void *s); |
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74 |
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75 private: |
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76 |
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77 union |
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78 { |
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79 bool *ptr_to_bool; |
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80 int *ptr_to_int; |
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81 void *gen_ptr; |
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82 void **ptr_to_gen_ptr; |
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83 }; |
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84 |
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85 union |
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86 { |
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87 bool bool_value; |
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88 int int_value; |
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89 const string *str_value; |
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90 void *gen_ptr_value; |
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91 }; |
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92 |
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93 var_type type_tag; |
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94 |
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95 size_t size; |
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96 }; |
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97 |
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98 saved_variable::saved_variable (void) |
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99 { |
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100 gen_ptr = 0; |
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101 gen_ptr_value = 0; |
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102 type_tag = generic; |
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103 size = 0; |
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104 } |
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105 |
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106 saved_variable::saved_variable (bool *p, bool v) |
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107 { |
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108 type_tag = boolean; |
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109 ptr_to_bool = p; |
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110 bool_value = v; |
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111 size = sizeof (bool); // Is this necessary? |
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112 } |
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113 |
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114 saved_variable::saved_variable (int *p, int v) |
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115 { |
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116 type_tag = integer; |
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117 ptr_to_int = p; |
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118 int_value = v; |
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119 size = sizeof (int); // Is this necessary? |
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120 } |
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121 |
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122 saved_variable::saved_variable (string *p, const string& v) |
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123 { |
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124 type_tag = string_type; |
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125 gen_ptr = p; |
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126 str_value = new string (v); |
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127 size = sizeof (string); // Is this necessary? |
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128 } |
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129 |
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130 saved_variable::saved_variable (void **p, void *v) |
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131 { |
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132 type_tag = generic_ptr; |
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133 ptr_to_gen_ptr = p; |
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134 gen_ptr_value = v; |
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135 size = sizeof (void *); |
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136 } |
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137 |
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138 saved_variable::~saved_variable (void) |
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139 { |
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140 switch (type_tag) |
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141 { |
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142 case string_type: |
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143 delete str_value; |
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144 break; |
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145 |
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146 case generic: |
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147 delete [] gen_ptr_value; // Can this be right? |
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148 break; |
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149 |
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150 default: |
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151 break; |
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152 } |
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153 } |
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154 |
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155 void |
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156 saved_variable::restore_value (void) |
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157 { |
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158 switch (type_tag) |
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159 { |
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160 case boolean: |
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161 *ptr_to_bool = bool_value; |
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162 break; |
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163 |
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164 case integer: |
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165 *ptr_to_int = int_value; |
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166 break; |
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167 |
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168 case string_type: |
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169 (static_cast<string *> (gen_ptr)) -> assign (*str_value); |
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170 break; |
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171 |
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172 case generic_ptr: |
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173 *ptr_to_gen_ptr = gen_ptr_value; |
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174 break; |
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175 |
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176 case generic: |
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177 memcpy (gen_ptr, gen_ptr_value, size); |
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178 break; |
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179 |
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180 default: |
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181 panic_impossible (); |
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182 break; |
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183 } |
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184 } |
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185 |
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186 void |
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187 saved_variable::restore (void *s) |
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188 { |
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189 saved_variable *sv = static_cast<saved_variable *> (s); |
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190 sv->restore_value (); |
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191 delete sv; |
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192 } |
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193 |
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194 void |
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195 unwind_protect::add (unwind_elem::cleanup_func fptr, void *ptr) |
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196 { |
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197 unwind_elem el (fptr, ptr); |
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198 list.push (el); |
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199 } |
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200 |
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201 void |
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202 unwind_protect::run (void) |
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203 { |
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204 unwind_elem el = list.pop (); |
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205 |
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206 unwind_elem::cleanup_func f = el.fptr (); |
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207 |
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208 if (f) |
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209 f (el.ptr ()); |
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210 } |
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211 |
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212 void |
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213 unwind_protect::discard (void) |
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214 { |
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215 list.pop (); |
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216 } |
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217 |
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218 void |
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219 unwind_protect::begin_frame (const string& tag) |
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220 { |
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221 unwind_elem elem (tag); |
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222 list.push (elem); |
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223 } |
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224 |
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225 void |
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226 unwind_protect::run_frame (const string& tag) |
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227 { |
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228 while (! list.empty ()) |
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229 { |
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230 unwind_elem el = list.pop (); |
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231 |
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232 unwind_elem::cleanup_func f = el.fptr (); |
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233 |
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234 if (f) |
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235 f (el.ptr ()); |
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236 |
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237 if (tag == el.tag ()) |
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238 break; |
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239 } |
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240 } |
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241 |
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242 void |
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243 unwind_protect::discard_frame (const string& tag) |
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244 { |
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245 while (! list.empty ()) |
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246 { |
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247 unwind_elem el = list.pop (); |
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248 |
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249 if (tag == el.tag ()) |
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250 break; |
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251 } |
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252 } |
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253 |
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254 void |
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255 unwind_protect::run_all (void) |
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256 { |
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257 while (! list.empty ()) |
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258 { |
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259 unwind_elem el = list.pop (); |
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260 |
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261 unwind_elem::cleanup_func f = el.fptr (); |
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262 |
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263 if (f) |
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264 f (el.ptr ()); |
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265 } |
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266 } |
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267 |
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268 void |
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269 unwind_protect::discard_all (void) |
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270 { |
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271 list.clear (); |
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272 } |
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273 |
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274 void |
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275 unwind_protect::save_bool (bool *ptr, bool value) |
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276 { |
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277 saved_variable *s = new saved_variable (ptr, value); |
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278 add (saved_variable::restore, s); |
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279 } |
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280 |
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281 void |
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282 unwind_protect::save_int (int *ptr, int value) |
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283 { |
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284 saved_variable *s = new saved_variable (ptr, value); |
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285 add (saved_variable::restore, s); |
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286 } |
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287 |
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288 void |
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289 unwind_protect::save_str (string *ptr, const string& value) |
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290 { |
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291 saved_variable *s = new saved_variable (ptr, value); |
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292 add (saved_variable::restore, s); |
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293 } |
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294 |
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295 void |
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296 unwind_protect::save_ptr (void **ptr, void *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 (saved_variable::restore, s); |
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300 } |
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301 |
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302 /* |
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303 ;;; Local Variables: *** |
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304 ;;; mode: C++ *** |
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305 ;;; End: *** |
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306 */ |
