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annotate src/unwind-prot.h @ 10066:2cd940306a06

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make unwind_protect frames local
author Jaroslav Hajek <highegg@gmail.com>
date Wed, 06 Jan 2010 13:18:41 +0100
parents 17af7cce7d1b
children cd96d29c5efa
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1 /*
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2
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3 Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2002, 2004,
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John W. Eaton <jwe@octave.org>
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4 2005, 2006, 2007, 2008 John W. Eaton
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5 Copyright (C) 2009, 2010 VZLU Prague
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6
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7 This file is part of Octave.
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8
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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9 Octave is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published by the
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11 Free Software Foundation; either version 3 of the License, or (at your
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12 option) any later version.
1
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14 Octave is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with Octave; see the file COPYING. If not, see
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21 <http://www.gnu.org/licenses/>.
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78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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23 */
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24
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25 #if !defined (octave_unwind_prot_h)
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26 #define octave_unwind_prot_h 1
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27
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28 #include <cstddef>
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29
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30 #include <string>
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31 #include <memory>
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32
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33 // This class allows registering cleanup actions.
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34 class
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35 OCTINTERP_API
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36 unwind_protect
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37 {
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38 public:
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39
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40 // A generic unwind_protect element. Knows how to run itself and discard itself.
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41 // Also, contains a pointer to the next element.
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42 class elem
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43 {
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44 elem *next;
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45
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46 public:
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47 virtual void run (void) { }
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48 virtual ~elem (void) { }
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49
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50 friend class unwind_protect;
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51 };
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52
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53 // An element that merely runs a void (*)(void) function.
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54
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55 class fcn_elem : public elem
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56 {
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57 public:
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58 fcn_elem (void (*fptr) (void))
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59 : e_fptr (fptr) { }
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60
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61 void run (void) { e_fptr (); }
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62
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63 private:
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64 void (*e_fptr) (void);
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65 };
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66
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67 // An element that stores a variable of type T along with a void (*) (T)
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68 // function pointer, and calls the function with the parameter.
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69
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70 template <class T>
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71 class fcn_arg_elem : public elem
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72 {
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73 public:
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74 fcn_arg_elem (void (*fcn) (T), T arg)
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75 : e_fcn (fcn), e_arg (arg) { }
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76
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77 void run (void) { e_fcn (e_arg); }
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78
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79 private:
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80 void (*e_fcn) (T);
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81 T e_arg;
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82 };
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83
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84 // An element for calling a member function.
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85
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86 template <class T>
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87 class method_elem : public elem
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88 {
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89 public:
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90 method_elem (T *obj, void (T::*method) (void))
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91 : e_obj (obj), e_method (method) { }
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92
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93 void run (void) { (e_obj->*e_method) (); }
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94
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95 private:
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96 T *e_obj;
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97 void (T::*e_method) (void);
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98 };
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99
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100 // An element that stores arbitrary variable, and restores it.
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101
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102 template <class T>
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103 class restore_var_elem : public elem
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104 {
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105 public:
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106 restore_var_elem (T& ref, const T& val)
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107 : e_ptr (&ref), e_val (val) { }
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108
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109 void run (void) { *e_ptr = e_val; }
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110
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111 private:
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112 T *e_ptr, e_val;
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113 };
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114
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115 // Deletes a class allocated using new.
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116
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117 template <class T>
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118 class delete_ptr_elem : public elem
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119 {
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120 public:
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121 delete_ptr_elem (T *ptr)
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122 : e_ptr (ptr) { }
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123
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124 void run (void) { delete e_ptr; }
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125
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126 private:
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127 T *e_ptr;
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128 };
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129
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130 unwind_protect (void) : head () { }
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131
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132 void add (elem *new_elem)
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133 {
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134 new_elem->next = head;
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135 head = new_elem;
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136 }
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137
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138 // For backward compatibility.
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139 void add (void (*fcn) (void *), void *ptr = 0)
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140 {
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141 add (new fcn_arg_elem<void *> (fcn, ptr));
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142 }
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143
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144 // Call to void func (void).
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145 void add_fcn (void (*fcn) (void))
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146 {
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147 add (new fcn_elem (fcn));
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148 }
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149
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150 // Call to void func (T).
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151 template <class T>
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152 void add_fcn (void (*action) (T), T val)
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153 {
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154 add (new fcn_arg_elem<T> (action, val));
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155 }
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156
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157 // Call to T::method (void).
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158 template <class T>
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159 void add_method (T *obj, void (T::*method) (void))
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160 {
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161 add (new method_elem<T> (obj, method));
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162 }
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163
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164 // Call to delete (T*).
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165
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166 template <class T>
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167 void add_delete (T *obj)
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168 {
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169 add (new delete_ptr_elem<T> (obj));
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170 }
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171
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172 // Protect any variable.
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173 template <class T>
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174 void protect_var (T& var)
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175 {
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176 add (new restore_var_elem<T> (var, var));
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177 }
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178
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179 // Protect any variable, value given.
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180 template <class T>
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181 void protect_var (T& var, const T& val)
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182 {
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183 add (new restore_var_elem<T> (var, val));
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184 }
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185
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186 operator bool (void) const
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187 {
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188 return head != 0;
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189 }
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190
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191 void run_top (void)
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192 {
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193 if (head)
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194 {
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195 // No leak on exception!
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196 std::auto_ptr<elem> ptr (head);
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197 head = ptr->next;
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198 ptr->run ();
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199 }
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200 }
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201
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202 void run_top (int num)
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203 {
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204 while (num-- > 0)
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205 run_top ();
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206 }
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207
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208 void discard_top (void)
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209 {
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210 if (head)
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211 {
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212 elem *ptr = head;
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213 head = ptr->next;
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214 delete ptr;
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215 }
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216 }
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217
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218 void discard_top (int num)
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219 {
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220 while (num-- > 0)
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221 discard_top ();
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222 }
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223
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224 void run (void)
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225 {
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226 while (head)
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227 run_top ();
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228 }
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229
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230 void discard (void)
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231 {
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232 while (head)
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233 discard_top ();
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234 }
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235
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236 // Destructor should not raise an exception, so all actions registered should
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237 // be exception-safe (but setting error_state is allowed). If you're not sure,
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238 // see unwind_protect_safe.
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239 ~unwind_protect (void)
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240 {
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241 run ();
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242 }
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243
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244 private:
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245
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246 elem *head;
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247 };
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248
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249 // Like unwind_protect, but this one will guard against the possibility of seeing
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250 // an exception (or interrupt) in the cleanup actions. Not that we can do much about
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251 // it, but at least we won't crash.
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252
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253 class unwind_protect_safe : public unwind_protect
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254 {
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255 static void gripe_exception (void);
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256
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257 public:
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258 ~unwind_protect_safe (void)
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259 {
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260 while (*this)
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261 {
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262 try
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263 {
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264 run_top ();
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265 }
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266 catch (...) // Yes, the black hole. Remember we're in a dtor.
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267 {
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268 gripe_exception ();
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269 }
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270 }
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271 }
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272 };
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273
1
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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274 #endif
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275
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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276 /*
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277 ;;; Local Variables: ***
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278 ;;; mode: C++ ***
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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279 ;;; End: ***
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280 */