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1 /* |
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2 |
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3 Copyright (C) 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2002, 2004, |
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4 2005, 2006, 2007 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 3 of the License, or (at your |
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11 option) any 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, see |
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20 <http://www.gnu.org/licenses/>. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include <cstddef> |
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29 #include <cstring> |
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30 |
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31 #include "CMatrix.h" |
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32 |
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33 #include "error.h" |
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34 #include "unwind-prot.h" |
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35 #include "utils.h" |
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36 |
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37 std::stack<unwind_elem> unwind_protect::elt_list; |
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38 |
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39 class |
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40 saved_variable |
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41 { |
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42 public: |
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43 |
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44 enum var_type |
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45 { |
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46 boolean, |
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47 integer, |
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48 string_type, |
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49 generic_ptr, |
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50 generic |
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51 }; |
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52 |
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53 saved_variable (void); |
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54 |
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55 saved_variable (bool *p, bool v); |
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56 |
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57 saved_variable (int *p, int v); |
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58 |
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59 saved_variable (std::string *p, const std::string& v); |
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60 |
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61 saved_variable (void **p, void *v); |
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62 |
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63 ~saved_variable (void); |
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64 |
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65 void restore_value (void); |
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66 |
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67 static void restore (void *s); |
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68 |
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69 private: |
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70 |
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71 union |
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72 { |
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73 bool *ptr_to_bool; |
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74 int *ptr_to_int; |
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75 void *gen_ptr; |
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76 void **ptr_to_gen_ptr; |
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77 }; |
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78 |
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79 union |
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80 { |
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81 bool bool_value; |
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82 int int_value; |
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83 std::string *str_value; |
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84 void *gen_ptr_value; |
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85 }; |
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86 |
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87 var_type type_tag; |
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88 |
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89 size_t size; |
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90 }; |
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91 |
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92 saved_variable::saved_variable (void) |
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93 { |
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94 gen_ptr = 0; |
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95 gen_ptr_value = 0; |
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96 type_tag = generic; |
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97 size = 0; |
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98 } |
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99 |
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100 saved_variable::saved_variable (bool *p, bool v) |
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101 { |
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102 type_tag = boolean; |
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103 ptr_to_bool = p; |
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104 bool_value = v; |
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105 size = sizeof (bool); // Is this necessary? |
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106 } |
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107 |
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108 saved_variable::saved_variable (int *p, int v) |
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109 { |
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110 type_tag = integer; |
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111 ptr_to_int = p; |
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112 int_value = v; |
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113 size = sizeof (int); // Is this necessary? |
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114 } |
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115 |
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116 saved_variable::saved_variable (std::string *p, const std::string& v) |
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117 { |
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118 type_tag = string_type; |
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119 gen_ptr = p; |
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120 str_value = new std::string (v); |
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121 size = sizeof (std::string); // Is this necessary? |
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122 } |
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123 |
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124 saved_variable::saved_variable (void **p, void *v) |
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125 { |
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126 type_tag = generic_ptr; |
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127 ptr_to_gen_ptr = p; |
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128 gen_ptr_value = v; |
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129 size = sizeof (void *); |
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130 } |
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131 |
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132 saved_variable::~saved_variable (void) |
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133 { |
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134 switch (type_tag) |
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135 { |
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136 case string_type: |
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137 delete str_value; |
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138 break; |
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139 |
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140 case generic: |
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141 // FIXME |
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142 // delete [] gen_ptr_value; |
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143 break; |
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144 |
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145 default: |
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146 break; |
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147 } |
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148 } |
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149 |
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150 void |
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151 saved_variable::restore_value (void) |
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152 { |
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153 switch (type_tag) |
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154 { |
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155 case boolean: |
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156 *ptr_to_bool = bool_value; |
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157 break; |
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158 |
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159 case integer: |
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160 *ptr_to_int = int_value; |
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161 break; |
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162 |
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163 case string_type: |
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164 (static_cast<std::string *> (gen_ptr)) -> assign (*str_value); |
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165 break; |
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166 |
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167 case generic_ptr: |
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168 *ptr_to_gen_ptr = gen_ptr_value; |
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169 break; |
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170 |
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171 case generic: |
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172 memcpy (gen_ptr, gen_ptr_value, size); |
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173 break; |
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174 |
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175 default: |
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176 panic_impossible (); |
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177 break; |
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178 } |
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179 } |
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180 |
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181 void |
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182 saved_variable::restore (void *s) |
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183 { |
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184 saved_variable *sv = static_cast<saved_variable *> (s); |
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185 sv->restore_value (); |
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186 delete sv; |
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187 } |
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188 |
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189 void |
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190 unwind_protect::add (unwind_elem::cleanup_func fptr, void *ptr) |
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191 { |
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192 unwind_elem el (fptr, ptr); |
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193 elt_list.push (el); |
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194 } |
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195 |
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196 void |
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197 unwind_protect::run (void) |
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198 { |
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199 unwind_elem el = elt_list.top (); |
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200 |
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201 elt_list.pop (); |
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202 |
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203 unwind_elem::cleanup_func f = el.fptr (); |
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204 |
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205 if (f) |
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206 f (el.ptr ()); |
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207 } |
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208 |
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209 void |
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210 unwind_protect::discard (void) |
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211 { |
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212 elt_list.pop (); |
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213 } |
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214 |
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215 void |
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216 unwind_protect::begin_frame (const std::string& tag) |
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217 { |
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218 unwind_elem elem (tag); |
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219 elt_list.push (elem); |
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220 } |
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221 |
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222 void |
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223 unwind_protect::run_frame (const std::string& tag) |
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224 { |
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225 while (! elt_list.empty ()) |
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226 { |
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227 unwind_elem el = elt_list.top (); |
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228 |
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229 elt_list.pop (); |
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230 |
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231 unwind_elem::cleanup_func f = el.fptr (); |
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232 |
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233 if (f) |
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234 f (el.ptr ()); |
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235 |
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236 if (tag == el.tag ()) |
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237 break; |
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238 } |
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239 } |
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240 |
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241 void |
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242 unwind_protect::discard_frame (const std::string& tag) |
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243 { |
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244 while (! elt_list.empty ()) |
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245 { |
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246 unwind_elem el = elt_list.top (); |
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247 |
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248 elt_list.pop (); |
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249 |
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250 if (tag == el.tag ()) |
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251 break; |
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252 } |
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253 } |
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254 |
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255 void |
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256 unwind_protect::run_all (void) |
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257 { |
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258 while (! elt_list.empty ()) |
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259 { |
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260 unwind_elem el = elt_list.top (); |
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261 |
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262 elt_list.pop (); |
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263 |
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264 unwind_elem::cleanup_func f = el.fptr (); |
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265 |
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266 if (f) |
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267 f (el.ptr ()); |
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268 } |
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269 } |
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270 |
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271 void |
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272 unwind_protect::discard_all (void) |
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273 { |
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274 while (! elt_list.empty ()) |
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275 elt_list.pop (); |
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276 } |
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277 |
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278 void |
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279 unwind_protect::save_bool (bool *ptr, bool value) |
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280 { |
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281 saved_variable *s = new saved_variable (ptr, value); |
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282 add (saved_variable::restore, s); |
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283 } |
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284 |
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285 void |
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286 unwind_protect::save_int (int *ptr, int value) |
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287 { |
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288 saved_variable *s = new saved_variable (ptr, value); |
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289 add (saved_variable::restore, s); |
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290 } |
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291 |
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292 void |
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293 unwind_protect::save_str (std::string *ptr, const std::string& value) |
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294 { |
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295 saved_variable *s = new saved_variable (ptr, value); |
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296 add (saved_variable::restore, s); |
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297 } |
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298 |
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299 void |
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300 unwind_protect::save_ptr (void **ptr, void *value) |
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301 { |
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302 saved_variable *s = new saved_variable (ptr, value); |
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303 add (saved_variable::restore, s); |
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304 } |
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305 |
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306 /* |
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307 ;;; Local Variables: *** |
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308 ;;; mode: C++ *** |
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309 ;;; End: *** |
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310 */ |
