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annotate src/unwind-prot.h @ 9394:b3ab22ee8544

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further improve unwind_protect
author Jaroslav Hajek <highegg@gmail.com>
date Thu, 25 Jun 2009 08:47:24 +0200
parents 8bec23396924
children 17af7cce7d1b
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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 VZLU Prague
1
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6
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7 This file is part of Octave.
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8
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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 <stack>
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32 #include <memory>
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33
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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 class elem
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42 {
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43 public:
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44 virtual void run (void) { }
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45 virtual ~elem (void) { }
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46 };
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47
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48 // An element that merely runs a void (*)(void *) function.
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49
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50 class fcn_elem : public elem
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51 {
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52 public:
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53 fcn_elem (void (*fptr) (void *), void *ptr)
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54 : e_fptr (fptr), e_ptr (ptr) { }
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55
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56 void run (void) { e_fptr (e_ptr); }
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57
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58 private:
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59 void (*e_fptr) (void *);
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60 void *e_ptr;
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61 };
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62
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63 // An element that stores arbitrary variable, and restores it.
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64
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65 template <class T>
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66 class restore_var_elem : public elem
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67 {
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68 public:
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69 restore_var_elem (T& ref, const T& val)
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70 : e_ptr (&ref), e_val (val) { }
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71
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72 void run (void) { *e_ptr = e_val; }
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73
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74 private:
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75 T *e_ptr, e_val;
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76 };
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77
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78 // An element that stores a variable of type T along with a void (*) (T)
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79 // function pointer, and calls the function with the parameter.
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80
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81 template <class T>
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82 class action_var_elem : public elem
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83 {
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84 public:
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85 action_var_elem (void (*fcn) (T), T val)
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86 : e_fcn (fcn), e_val (val) { }
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87
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88 void run (void) { e_fcn (e_val); }
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89
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90 private:
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91 void (*e_fcn) (T);
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92 T e_val;
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93 };
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94
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95 typedef size_t frame_id_t;
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96
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97 // Generic. Users may subclass elem to provide their own cleanup.
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98 static void add (elem *el)
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99 {
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100 elt_list.push (el);
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101 }
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102
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103 static bool empty (void)
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104 { return elt_list.empty (); }
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105
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106 static void run (void)
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107 {
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108 // Use auto_ptr, so that even if the following run () call throws an
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109 // exception, we still clean up the element.
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110 std::auto_ptr<elem> elt (elt_list.top ());
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111 elt_list.pop ();
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112
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113 elt->run ();
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114 }
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115
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116 static void discard (void)
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117 {
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118 // No need to use ato_ptr here.
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119 elem *elt = elt_list.top ();
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120 elt_list.pop ();
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121
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122 delete elt;
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123 }
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124
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125 static frame_id_t begin_frame ()
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126 {
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127 return elt_list.size ();
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128 }
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129
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130 static void run_frame (frame_id_t frame_id)
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131 {
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132 while (elt_list.size () > frame_id)
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133 run ();
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134 }
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135
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136 static void discard_frame (frame_id_t frame_id)
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137 {
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138 while (elt_list.size () > frame_id)
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139 discard ();
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140 }
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141
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142 // String tags are deprecated. Use the above trio.
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143
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144 static void begin_frame (const std::string& tag) GCC_ATTR_DEPRECATED;
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145
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146 static void run_frame (const std::string& tag) GCC_ATTR_DEPRECATED;
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147
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148 static void discard_frame (const std::string& tag) GCC_ATTR_DEPRECATED;
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149
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150 static void run_all (void)
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151 {
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152 run_frame (0);
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153 while (! tag_list.empty ())
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154 tag_list.pop ();
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155 }
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156
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157 static void discard_all (void)
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158 {
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159 discard_frame (0);
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160 while (! tag_list.empty ())
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161 tag_list.pop ();
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162 }
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163
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164 static void add (void (*fcn) (void *), void *ptr = 0)
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165 {
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166 elt_list.push (new fcn_elem (fcn, ptr));
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167 }
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168
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169 // Protect any variable.
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170 template <class T>
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171 static void protect_var (T& var)
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172 {
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173 elt_list.push (new restore_var_elem<T> (var, var));
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174 }
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175
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176 // Protect any variable, value given.
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177 template <class T>
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178 static void protect_var (T& var, const T& val)
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179 {
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180 elt_list.push (new restore_var_elem<T> (var, val));
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181 }
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182
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183 // Store a function pointer together with a single argument (passed by value).
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184 template <class T>
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185 static void add_action_var (void (*action) (T), T val)
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186 {
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187 elt_list.push (new action_var_elem<T> (action, val));
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188 }
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189
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190 private:
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191
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192 static std::stack<elem *> elt_list;
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193
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194 static std::stack<std::pair <std::string, frame_id_t> > tag_list;
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195 };
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196
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197 // Backward compatibility macros. Avoid them; use protect_var directly.
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198
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199 #define unwind_protect_bool(b) \
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200 unwind_protect::protect_var (b)
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201
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202 #define unwind_protect_int(i) \
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203 unwind_protect::protect_var (i)
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204
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205 #define unwind_protect_size_t(i) \
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206 unwind_protect::protect_var (i)
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207
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208 #define unwind_protect_str(s) \
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209 unwind_protect::protect_var (s)
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210
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211 #define unwind_protect_ptr(p) \
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212 unwind_protect::protect_var (p)
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213
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214 #define unwind_protect_fptr(p) \
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215 unwind_protect::protect_var (p)
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216
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217 #define unwind_protect_const_ptr(p) \
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218 unwind_protect::protect_var (p)
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219
1
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220 #endif
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221
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222 /*
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223 ;;; Local Variables: ***
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224 ;;; mode: C++ ***
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225 ;;; End: ***
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226 */