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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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240
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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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1343
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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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453
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37 #include "CMatrix.h" |
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38 |
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1352
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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 // XXX FIXME XXX -- this should really be static, but that causes |
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44 // problems on some systems. |
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45 SLStack <unwind_elem> unwind_protect_list; |
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46 |
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47 void |
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48 add_unwind_protect (cleanup_func fptr, void *ptr) |
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49 { |
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50 unwind_elem el (fptr, ptr); |
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51 unwind_protect_list.push (el); |
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52 } |
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53 |
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54 void |
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55 run_unwind_protect (void) |
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56 { |
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57 unwind_elem el = unwind_protect_list.pop (); |
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58 |
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59 cleanup_func f = el.fptr (); |
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60 |
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61 if (f) |
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62 f (el.ptr ()); |
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63 } |
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64 |
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65 void |
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66 discard_unwind_protect (void) |
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67 { |
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68 unwind_protect_list.pop (); |
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69 } |
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70 |
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71 void |
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72 begin_unwind_frame (const string& tag) |
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73 { |
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74 unwind_elem elem (tag); |
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75 unwind_protect_list.push (elem); |
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76 } |
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77 |
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78 void |
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79 run_unwind_frame (const string& tag) |
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80 { |
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81 while (! unwind_protect_list.empty ()) |
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82 { |
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83 unwind_elem el = unwind_protect_list.pop (); |
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84 |
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85 cleanup_func f = el.fptr (); |
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86 |
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87 if (f) |
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88 f (el.ptr ()); |
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89 |
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90 if (tag == el.tag ()) |
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91 break; |
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92 } |
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93 } |
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94 |
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95 void |
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96 discard_unwind_frame (const string& tag) |
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97 { |
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98 while (! unwind_protect_list.empty ()) |
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99 { |
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100 unwind_elem el = unwind_protect_list.pop (); |
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101 |
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102 if (tag == el.tag ()) |
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103 break; |
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104 } |
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105 } |
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106 |
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107 void |
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108 run_all_unwind_protects (void) |
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109 { |
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110 while (! unwind_protect_list.empty ()) |
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111 { |
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112 unwind_elem el = unwind_protect_list.pop (); |
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113 |
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114 cleanup_func f = el.fptr (); |
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115 |
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116 if (f) |
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117 f (el.ptr ()); |
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118 } |
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119 } |
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120 |
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121 void |
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122 discard_all_unwind_protects (void) |
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123 { |
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124 unwind_protect_list.clear (); |
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125 } |
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126 |
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127 class saved_variable |
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128 { |
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129 public: |
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130 enum var_type { integer, string_type, generic_ptr, generic }; |
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131 |
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132 saved_variable (void); |
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133 saved_variable (int *p, int v); |
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134 saved_variable (string *p, const string& v); |
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135 saved_variable (void **p, void *v); |
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136 ~saved_variable (void); |
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137 |
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138 void restore_value (void); |
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139 |
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140 private: |
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141 union |
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142 { |
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143 int *ptr_to_int; |
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144 void *gen_ptr; |
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145 void **ptr_to_gen_ptr; |
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146 }; |
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147 |
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148 union |
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149 { |
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150 int int_value; |
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151 const string *str_value; |
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152 void *gen_ptr_value; |
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153 }; |
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154 |
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155 var_type type_tag; |
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156 size_t size; |
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157 }; |
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158 |
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159 saved_variable::saved_variable (void) |
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160 { |
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161 gen_ptr = 0; |
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162 gen_ptr_value = 0; |
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163 type_tag = generic; |
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164 size = 0; |
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165 } |
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166 |
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167 saved_variable::saved_variable (int *p, int v) |
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168 { |
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169 type_tag = integer; |
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170 ptr_to_int = p; |
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171 int_value = v; |
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172 size = sizeof (int); // Is this necessary? |
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173 } |
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174 |
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175 saved_variable::saved_variable (string *p, const string& v) |
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176 { |
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177 type_tag = string_type; |
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178 gen_ptr = p; |
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179 str_value = new string (v); |
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180 size = sizeof (string); // Is this necessary? |
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181 } |
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182 |
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183 saved_variable::saved_variable (void **p, void *v) |
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184 { |
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185 type_tag = generic_ptr; |
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186 ptr_to_gen_ptr = p; |
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187 gen_ptr_value = v; |
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188 size = sizeof (void *); |
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189 } |
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190 |
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191 saved_variable::~saved_variable (void) |
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192 { |
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193 switch (type_tag) |
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194 { |
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195 case string_type: |
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196 delete str_value; |
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197 break; |
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198 |
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199 case generic: |
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200 delete [] gen_ptr_value; // Can this be right? |
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201 break; |
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202 |
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203 default: |
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204 break; |
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205 } |
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206 } |
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207 |
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208 void |
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209 saved_variable::restore_value (void) |
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210 { |
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211 switch (type_tag) |
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212 { |
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213 case integer: |
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214 *ptr_to_int = int_value; |
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215 break; |
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216 |
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217 case string_type: |
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218 (static_cast<string *> (gen_ptr)) -> assign (*str_value); |
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219 break; |
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220 |
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221 case generic_ptr: |
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222 *ptr_to_gen_ptr = gen_ptr_value; |
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223 break; |
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224 |
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225 case generic: |
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226 memcpy (gen_ptr, gen_ptr_value, size); |
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227 break; |
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228 |
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229 default: |
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230 panic_impossible (); |
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231 break; |
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232 } |
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233 } |
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234 |
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235 static void |
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236 restore_saved_variable (void *s) |
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237 { |
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238 saved_variable *sv = static_cast<saved_variable *> (s); |
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239 sv->restore_value (); |
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240 delete sv; |
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241 } |
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242 |
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243 void |
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244 unwind_protect_int_internal (int *ptr, int value) |
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245 { |
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246 saved_variable *s = new saved_variable (ptr, value); |
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247 add_unwind_protect (restore_saved_variable, s); |
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248 } |
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249 |
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250 void |
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251 unwind_protect_str_internal (string *ptr, const string& value) |
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252 { |
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253 saved_variable *s = new saved_variable (ptr, value); |
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254 add_unwind_protect (restore_saved_variable, s); |
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255 } |
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256 |
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257 void |
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258 unwind_protect_ptr_internal (void **ptr, void *value) |
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259 { |
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260 saved_variable *s = new saved_variable (ptr, value); |
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2800
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261 add_unwind_protect (restore_saved_variable, s); |
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262 } |
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263 |
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264 /* |
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265 ;;; Local Variables: *** |
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266 ;;; mode: C++ *** |
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267 ;;; End: *** |
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268 */ |
