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annotate libinterp/interp-core/unwind-prot.h @ 15195:2fc554ffbc28

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split libinterp from src * libinterp: New directory. Move all files from src directory here except Makefile.am, main.cc, main-cli.cc, mkoctfile.in.cc, mkoctfilr.in.sh, octave-config.in.cc, octave-config.in.sh. * libinterp/Makefile.am: New file, extracted from src/Makefile.am. * src/Makefile.am: Delete everything except targets and definitions needed to build and link main and utility programs. * Makefile.am (SUBDIRS): Include libinterp in the list. * autogen.sh: Run config-module.sh in libinterp/dldfcn directory, not src/dldfcn directory. * configure.ac (AC_CONFIG_SRCDIR): Use libinterp/octave.cc, not src/octave.cc. (DL_LDFLAGS, LIBOCTINTERP): Use libinterp, not src. (AC_CONFIG_FILES): Include libinterp/Makefile in the list. * find-docstring-files.sh: Look in libinterp, not src. * gui/src/Makefile.am (liboctgui_la_CPPFLAGS): Find header files in libinterp, not src.
author John W. Eaton <jwe@octave.org>
date Sat, 18 Aug 2012 16:23:39 -0400
parents src/interp-core/unwind-prot.h@909a2797935b
children 1054ab58cd58
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1 /*
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2
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3 Copyright (C) 1993-2012 John W. Eaton
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4 Copyright (C) 2009-2010 VZLU Prague
1
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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.
1
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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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22 */
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23
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24 #if !defined (octave_unwind_prot_h)
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25 #define octave_unwind_prot_h 1
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27 #include <cstddef>
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29 #include <string>
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30 #include <memory>
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31
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32 // This class allows registering cleanup actions.
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33 class
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34 OCTINTERP_API
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35 unwind_protect
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36 {
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37 public:
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38
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39 // A generic unwind_protect element. Knows how to run itself and discard itself.
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40 // Also, contains a pointer to the next element.
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41 class elem
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42 {
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43 elem *next;
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44
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45 public:
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46 elem (void) : next (0) { }
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47
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48 virtual void run (void) { }
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49
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50 virtual ~elem (void) { }
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51
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52 friend class unwind_protect;
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53
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54 private:
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55
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56 // No copying!
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57
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58 elem (const elem&);
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59
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60 elem& operator = (const elem&);
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61 };
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62
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63 // An element that merely runs a void (*)(void) function.
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64
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65 class fcn_elem : public elem
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66 {
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67 public:
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68 fcn_elem (void (*fptr) (void))
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69 : e_fptr (fptr) { }
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70
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71 void run (void) { e_fptr (); }
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72
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73 private:
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74 void (*e_fptr) (void);
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75 };
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76
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77 // An element that stores a variable of type T along with a void (*) (T)
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78 // function pointer, and calls the function with the parameter.
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79
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80 template <class T>
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81 class fcn_arg_elem : public elem
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82 {
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83 public:
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84 fcn_arg_elem (void (*fcn) (T), T arg)
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85 : e_fcn (fcn), e_arg (arg) { }
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86
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87 void run (void) { e_fcn (e_arg); }
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88
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89 private:
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90
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91 // No copying!
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92
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93 fcn_arg_elem (const fcn_arg_elem&);
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94
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95 fcn_arg_elem& operator = (const fcn_arg_elem&);
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96
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97 void (*e_fcn) (T);
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98 T e_arg;
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99 };
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100
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101 // An element that stores a variable of type T along with a void (*) (const T&)
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102 // function pointer, and calls the function with the parameter.
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103
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104 template <class T>
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105 class fcn_crefarg_elem : public elem
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106 {
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107 public:
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108 fcn_crefarg_elem (void (*fcn) (const T&), T arg)
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109 : e_fcn (fcn), e_arg (arg) { }
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110
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111 void run (void) { e_fcn (e_arg); }
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112
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113 private:
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114 void (*e_fcn) (const T&);
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115 T e_arg;
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116 };
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117
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118 // An element for calling a member function.
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119
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120 template <class T>
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121 class method_elem : public elem
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122 {
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123 public:
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124 method_elem (T *obj, void (T::*method) (void))
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125 : e_obj (obj), e_method (method) { }
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126
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127 void run (void) { (e_obj->*e_method) (); }
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128
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129 private:
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130
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131 T *e_obj;
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132 void (T::*e_method) (void);
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133
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134 // No copying!
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135
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136 method_elem (const method_elem&);
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137
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138 method_elem operator = (const method_elem&);
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139 };
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140
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141 // An element that stores arbitrary variable, and restores it.
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142
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143 template <class T>
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144 class restore_var_elem : public elem
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145 {
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146 public:
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147 restore_var_elem (T& ref, const T& val)
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148 : e_ptr (&ref), e_val (val) { }
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149
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150 void run (void) { *e_ptr = e_val; }
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151
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152 private:
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153
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154 // No copying!
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155
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156 restore_var_elem (const restore_var_elem&);
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157
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158 restore_var_elem& operator = (const restore_var_elem&);
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159
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160 T *e_ptr, e_val;
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161 };
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162
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163 // Deletes a class allocated using new.
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164
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165 template <class T>
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166 class delete_ptr_elem : public elem
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167 {
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168 public:
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169 delete_ptr_elem (T *ptr)
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170 : e_ptr (ptr) { }
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171
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172 void run (void) { delete e_ptr; }
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173
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174 private:
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175
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176 T *e_ptr;
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177
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178 // No copying!
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179
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180 delete_ptr_elem (const delete_ptr_elem&);
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181
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182 delete_ptr_elem operator = (const delete_ptr_elem&);
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183 };
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184
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185 unwind_protect (void) : head () { }
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186
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187 void add (elem *new_elem)
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188 {
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189 new_elem->next = head;
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190 head = new_elem;
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191 }
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192
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193 // For backward compatibility.
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194 void add (void (*fcn) (void *), void *ptr = 0)
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195 {
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196 add (new fcn_arg_elem<void *> (fcn, ptr));
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197 }
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198
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199 // Call to void func (void).
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200 void add_fcn (void (*fcn) (void))
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201 {
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202 add (new fcn_elem (fcn));
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203 }
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204
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205 // Call to void func (T).
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206 template <class T>
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207 void add_fcn (void (*action) (T), T val)
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208 {
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209 add (new fcn_arg_elem<T> (action, val));
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210 }
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211
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212 // Call to void func (const T&).
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213 template <class T>
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214 void add_fcn (void (*action) (const T&), T val)
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215 {
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216 add (new fcn_crefarg_elem<T> (action, val));
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217 }
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218
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219 // Call to T::method (void).
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220 template <class T>
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221 void add_method (T *obj, void (T::*method) (void))
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222 {
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223 add (new method_elem<T> (obj, method));
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224 }
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225
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226 // Call to delete (T*).
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227
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228 template <class T>
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229 void add_delete (T *obj)
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230 {
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231 add (new delete_ptr_elem<T> (obj));
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232 }
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233
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234 // Protect any variable.
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235 template <class T>
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236 void protect_var (T& var)
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237 {
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238 add (new restore_var_elem<T> (var, var));
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239 }
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240
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241 // Protect any variable, value given.
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242 template <class T>
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243 void protect_var (T& var, const T& val)
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244 {
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245 add (new restore_var_elem<T> (var, val));
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246 }
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247
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248 operator bool (void) const
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249 {
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250 return head != 0;
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251 }
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252
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253 void run_top (void)
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254 {
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255 if (head)
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256 {
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257 // No leak on exception!
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258 std::auto_ptr<elem> ptr (head);
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259 head = ptr->next;
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260 ptr->run ();
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261 }
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262 }
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263
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264 void run_top (int num)
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265 {
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266 while (num-- > 0)
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267 run_top ();
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268 }
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269
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270 void discard_top (void)
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271 {
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272 if (head)
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273 {
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274 elem *ptr = head;
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275 head = ptr->next;
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276 delete ptr;
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277 }
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278 }
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279
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280 void discard_top (int num)
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281 {
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282 while (num-- > 0)
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283 discard_top ();
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284 }
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285
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286 void run (void)
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287 {
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288 while (head)
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289 run_top ();
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290 }
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291
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292 void discard (void)
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293 {
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294 while (head)
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295 discard_top ();
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296 }
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297
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298 // Destructor should not raise an exception, so all actions registered should
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299 // be exception-safe (but setting error_state is allowed). If you're not sure,
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300 // see unwind_protect_safe.
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301 ~unwind_protect (void)
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302 {
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303 run ();
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304 }
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305
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306 private:
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307
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308 elem *head;
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309
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310 // No copying!
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311
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312 unwind_protect (const unwind_protect&);
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313
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314 unwind_protect& operator = (const unwind_protect&);
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315 };
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316
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317 // Like unwind_protect, but this one will guard against the possibility of seeing
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318 // an exception (or interrupt) in the cleanup actions. Not that we can do much about
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319 // it, but at least we won't crash.
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320
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321 class
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322 OCTINTERP_API
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323 unwind_protect_safe : public unwind_protect
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324 {
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325 static void gripe_exception (void);
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326
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327 public:
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328 ~unwind_protect_safe (void)
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329 {
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330 while (*this)
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331 {
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332 try
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333 {
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334 run_top ();
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335 }
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336 catch (...) // Yes, the black hole. Remember we're in a dtor.
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337 {
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338 gripe_exception ();
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339 }
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340 }
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341 }
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342 };
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343
1
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344 #endif