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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 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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef __GNUG__ |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #include <stddef.h> |
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29 |
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30 #include "SLStack.h" |
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31 |
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32 #include "Matrix.h" |
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33 |
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34 #include "unwind-prot.h" |
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35 #include "error.h" |
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36 #include "utils.h" |
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37 |
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38 class unwind_elem |
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39 { |
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40 public: |
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41 unwind_elem (void); |
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42 unwind_elem (char *t); |
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43 unwind_elem (cleanup_func f, void *p); |
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44 unwind_elem (const unwind_elem& el); |
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45 ~unwind_elem (void); |
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46 |
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47 unwind_elem& operator = (const unwind_elem& el); |
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48 |
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49 char *tag (void); |
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50 cleanup_func fptr (void); |
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51 void *ptr (void); |
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52 |
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53 private: |
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54 char *_tag; |
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55 cleanup_func _fptr; |
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56 void *_ptr; |
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57 }; |
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58 |
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59 unwind_elem::unwind_elem (void) |
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60 { |
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61 _tag = (char *) NULL; |
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62 _fptr = (cleanup_func) NULL; |
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63 _ptr = (void *) NULL; |
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64 } |
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65 |
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66 unwind_elem::unwind_elem (char *t) |
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67 { |
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68 _tag = strsave (t); |
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69 _fptr = (cleanup_func) NULL; |
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70 _ptr = (void *) NULL; |
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71 } |
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72 |
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73 unwind_elem::unwind_elem (cleanup_func f, void *p) |
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74 { |
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75 _tag = (char *) NULL; |
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76 _fptr = f; |
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77 _ptr = p; |
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78 } |
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79 |
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80 unwind_elem::unwind_elem (const unwind_elem& el) |
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81 { |
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82 _tag = strsave (el._tag); |
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83 _fptr = el._fptr; |
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84 _ptr = el._ptr; |
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85 } |
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86 |
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87 unwind_elem::~unwind_elem (void) |
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88 { |
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89 delete [] _tag; |
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90 } |
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91 |
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92 unwind_elem& |
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93 unwind_elem::operator = (const unwind_elem& el) |
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94 { |
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95 _tag = strsave (el._tag); |
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96 _fptr = el._fptr; |
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97 _ptr = el._ptr; |
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98 |
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99 return *this; |
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100 } |
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101 |
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102 char * |
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103 unwind_elem::tag (void) |
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104 { |
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105 return _tag; |
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106 } |
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107 |
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108 cleanup_func |
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109 unwind_elem::fptr (void) |
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110 { |
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111 return _fptr; |
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112 } |
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113 |
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114 void * |
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115 unwind_elem::ptr (void) |
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116 { |
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117 return _ptr; |
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118 } |
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119 |
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120 static SLStack <unwind_elem> unwind_protect_list; |
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121 |
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122 void |
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123 add_unwind_protect (cleanup_func fptr, void *ptr) |
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124 { |
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125 unwind_elem el (fptr, ptr); |
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126 unwind_protect_list.push (el); |
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127 } |
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128 |
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129 void |
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130 run_unwind_protect (void) |
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131 { |
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132 unwind_elem el = unwind_protect_list.pop (); |
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133 |
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134 cleanup_func f = el.fptr (); |
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135 if (f != (cleanup_func) NULL) |
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136 f (el.ptr ()); |
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137 } |
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138 |
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139 void |
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140 discard_unwind_protect (void) |
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141 { |
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142 unwind_protect_list.pop (); |
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143 } |
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144 |
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145 void |
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146 begin_unwind_frame (char *tag) |
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147 { |
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148 unwind_elem elem (tag); |
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149 unwind_protect_list.push (elem); |
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150 } |
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151 |
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152 void |
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153 run_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 |
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159 cleanup_func f = el.fptr (); |
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160 if (f != (cleanup_func) NULL) |
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161 f (el.ptr ()); |
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162 |
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163 char *t = el.tag (); |
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164 if (t != (char *) NULL && strcmp (t, tag) == 0) |
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165 break; |
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166 } |
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167 } |
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168 |
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169 void |
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170 discard_unwind_frame (char *tag) |
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171 { |
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172 while (! unwind_protect_list.empty ()) |
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173 { |
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174 unwind_elem el = unwind_protect_list.pop (); |
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175 char *t = el.tag (); |
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176 if (t != (char *) NULL && strcmp (t, tag) == 0) |
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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 run_all_unwind_protects (void) |
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183 { |
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184 while (! unwind_protect_list.empty ()) |
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185 { |
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186 unwind_elem el = unwind_protect_list.pop (); |
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187 |
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188 cleanup_func f = el.fptr (); |
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189 if (f != (cleanup_func) NULL) |
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190 f (el.ptr ()); |
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191 } |
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192 } |
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193 |
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194 void |
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195 discard_all_unwind_protects (void) |
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196 { |
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197 unwind_protect_list.clear (); |
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198 } |
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199 |
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200 void |
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201 matrix_cleanup (void *m) |
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202 { |
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203 delete [] (double *) m; |
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204 } |
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205 |
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206 void |
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207 complex_matrix_cleanup (void *cm) |
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208 { |
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209 delete [] (ComplexMatrix *) cm; |
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210 } |
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211 |
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212 class saved_variable |
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213 { |
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214 public: |
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215 enum var_type { integer, generic_ptr, generic }; |
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216 |
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217 saved_variable (void); |
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218 saved_variable (int *p, int v); |
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219 saved_variable (void **p, void *v); |
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220 saved_variable (void *p, void *v, size_t sz); |
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221 ~saved_variable (void); |
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222 |
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223 void restore_value (void); |
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224 |
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225 private: |
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226 union |
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227 { |
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228 int *ptr_to_int; |
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229 void *gen_ptr; |
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230 void **ptr_to_gen_ptr; |
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231 }; |
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232 |
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233 union |
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234 { |
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235 int int_value; |
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236 void *gen_ptr_value; |
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237 }; |
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238 |
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239 var_type type_tag; |
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240 size_t size; |
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241 }; |
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242 |
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243 saved_variable::saved_variable (void) |
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244 { |
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245 gen_ptr = (void *) NULL; |
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246 gen_ptr_value = (void *) NULL; |
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247 type_tag = generic; |
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248 size = 0; |
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249 } |
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250 |
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251 saved_variable::saved_variable (int *p, int v) |
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252 { |
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253 type_tag = integer; |
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254 ptr_to_int = p; |
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255 int_value = v; |
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256 size = sizeof (int); |
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257 } |
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258 |
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259 saved_variable::saved_variable (void **p, void *v) |
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260 { |
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261 type_tag = generic_ptr; |
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262 ptr_to_gen_ptr = p; |
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263 gen_ptr_value = v; |
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264 size = sizeof (void *); |
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265 } |
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266 |
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267 saved_variable::saved_variable (void *p, void *v, size_t sz) |
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268 { |
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269 gen_ptr = v; |
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270 gen_ptr_value = new char [sz]; |
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271 memcpy (gen_ptr_value, v, sz); |
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272 size = sz; |
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273 } |
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274 |
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275 saved_variable::~saved_variable (void) |
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276 { |
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277 if (type_tag == generic) |
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278 delete [] gen_ptr_value; |
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279 } |
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280 |
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281 void |
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282 saved_variable::restore_value (void) |
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283 { |
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284 switch (type_tag) |
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285 { |
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286 case integer: |
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287 *ptr_to_int = int_value; |
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288 break; |
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289 case generic_ptr: |
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290 *ptr_to_gen_ptr = gen_ptr_value; |
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291 break; |
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292 case generic: |
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293 memcpy (gen_ptr, gen_ptr_value, size); |
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294 break; |
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295 default: |
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296 panic_impossible (); |
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297 } |
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298 } |
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299 |
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300 static void |
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301 restore_saved_variable (void *s) |
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302 { |
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303 saved_variable *sv = (saved_variable *) s; |
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304 sv->restore_value (); |
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305 delete sv; |
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306 } |
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307 |
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308 void |
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309 unwind_protect_int_internal (int *ptr, int value) |
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310 { |
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311 saved_variable *s = new saved_variable (ptr, value); |
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312 add_unwind_protect (restore_saved_variable, (void *) s); |
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313 } |
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314 |
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315 void |
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316 unwind_protect_ptr_internal (void **ptr, void *value) |
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317 { |
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318 saved_variable *s = new saved_variable (ptr, value); |
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319 add_unwind_protect (restore_saved_variable, (void *) s); |
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320 } |
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321 |
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322 void |
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323 unwind_protect_var_internal (void *ptr, void *value, size_t size) |
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324 { |
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325 saved_variable *s = new saved_variable (ptr, value, size); |
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326 add_unwind_protect (restore_saved_variable, (void *) s); |
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327 } |
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328 |
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329 /* |
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330 ;;; Local Variables: *** |
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331 ;;; mode: C++ *** |
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332 ;;; page-delimiter: "^/\\*" *** |
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333 ;;; End: *** |
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334 */ |
