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annotate libinterp/octave-value/ov-oncleanup.cc @ 19898:4197fc428c7d

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maint: Update copyright notices for 2015.
author John W. Eaton <jwe@octave.org>
date Wed, 11 Feb 2015 14:19:08 -0500
parents 972abb60c30f
children 09ed6f7538dd
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1 /*
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2
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3 Copyright (C) 2010-2015 VZLU Prague
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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 3 of the License, or (at your
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10 option) any 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, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include "defun.h"
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28 #include "ov-oncleanup.h"
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29 #include "ov-fcn.h"
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30 #include "ov-usr-fcn.h"
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31 #include "pt-misc.h"
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32 #include "toplev.h"
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33
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34 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_oncleanup, "onCleanup",
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35 "onCleanup");
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36
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37 octave_oncleanup::octave_oncleanup (const octave_value& f)
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38 : fcn (f)
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39 {
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40 if (f.is_function_handle ())
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41 {
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42 octave_function *fptr = f.function_value (true);
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43 if (fptr)
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44 {
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45 octave_user_function *uptr
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46 = dynamic_cast<octave_user_function *> (fptr);
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47
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48 if (uptr != 0)
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49 {
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50 tree_parameter_list *pl = uptr->parameter_list ();
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51
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52 if (pl != 0 && pl->length () > 0)
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53 warning ("onCleanup: cleanup action takes parameters");
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54 }
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55 }
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56 else
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57 error ("onCleanup: no default dispatch for function handle");
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58 }
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59 else
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60 {
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61 fcn = octave_value ();
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62 error ("onCleanup: argument must be a function handle");
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63 }
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64 }
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65
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66 octave_oncleanup::~octave_oncleanup (void)
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67 {
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68 if (fcn.is_undefined ())
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69 return;
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70
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71 unwind_protect frame;
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72
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73 // Clear interrupts.
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74 frame.protect_var (octave_interrupt_state);
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75 octave_interrupt_state = 0;
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76
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77 // Disallow quit().
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78 frame.protect_var (quit_allowed);
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79 quit_allowed = false;
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80
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81 // Clear errors.
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82 frame.protect_var (error_state);
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83 error_state = 0;
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84
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85 try
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86 {
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87 // Run the actual code.
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88 fcn.do_multi_index_op (0, octave_value_list ());
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89 }
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90 catch (octave_interrupt_exception)
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91 {
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92 // Swallow the interrupt.
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93 warning ("onCleanup: interrupt occured in cleanup action");
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94 }
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95 catch (...) // Yes, the black hole. We're in a d-tor.
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96 {
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97 // This shouldn't happen, in theory.
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98 error ("onCleanup: internal error: unhandled exception in cleanup action");
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99 }
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100
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101 // FIXME: can this happen now?
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102 if (error_state)
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103 frame.discard_first ();
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104 }
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105
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106 octave_scalar_map
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107 octave_oncleanup::scalar_map_value (void) const
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108 {
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109 octave_scalar_map retval;
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110 retval.setfield ("task", fcn);
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111 return retval;
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112 }
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113
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114 static void
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115 warn_save_load (void)
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116 {
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117 warning ("onCleanup: load and save not supported");
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118 }
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119
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120 bool
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121 octave_oncleanup::save_ascii (std::ostream& /* os */)
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122 {
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123 warn_save_load ();
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124 return true;
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125 }
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126
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127 bool
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128 octave_oncleanup::load_ascii (std::istream& /* is */)
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129 {
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130 warn_save_load ();
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131 return true;
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132 }
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133
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134 bool
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135 octave_oncleanup::save_binary (std::ostream& /* os */,
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136 bool& /* save_as_floats */)
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137 {
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138 warn_save_load ();
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139 return true;
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140 }
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141
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142 bool
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143 octave_oncleanup::load_binary (std::istream& /* is */, bool /* swap */,
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144 oct_mach_info::float_format /* fmt */)
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145 {
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146 warn_save_load ();
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147 return true;
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148 }
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149
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150 #if defined (HAVE_HDF5)
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151 bool
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152 octave_oncleanup::save_hdf5 (hid_t /* loc_id */, const char * /* name */,
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153 bool /* save_as_floats */)
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154 {
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155 warn_save_load ();
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156 return true;
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157 }
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158
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159 bool
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160 octave_oncleanup::load_hdf5 (hid_t /* loc_id */, const char * /* name */)
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161 {
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162 warn_save_load ();
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163 return true;
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164 }
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165 #endif
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166
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167 void
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168 octave_oncleanup::print (std::ostream& os, bool pr_as_read_syntax)
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169 {
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170 print_raw (os, pr_as_read_syntax);
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171 newline (os);
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172 }
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173
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174 void
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175 octave_oncleanup::print_raw (std::ostream& os, bool pr_as_read_syntax) const
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176 {
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177 os << "onCleanup (";
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178 if (fcn.is_defined ())
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179 fcn.print_raw (os, pr_as_read_syntax);
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180 os << ")";
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181 }
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182
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183 DEFUN (onCleanup, args, ,
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184 "-*- texinfo -*-\n\
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185 @deftypefn {Built-in Function} {@var{obj} =} onCleanup (@var{function})\n\
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186 Create a special object that executes a given function upon destruction.\n\
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187 If the object is copied to multiple variables (or cell or struct array\n\
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188 elements) or returned from a function, @var{function} will be executed after\n\
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189 clearing the last copy of the object. Note that if multiple local onCleanup\n\
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190 variables are created, the order in which they are called is unspecified.\n\
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191 For similar functionality @xref{The unwind_protect Statement}.\n\
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192 @end deftypefn")
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193 {
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194 octave_value retval;
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195
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196 if (args.length () == 1)
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197 retval = octave_value (new octave_oncleanup (args(0)));
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198 else
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199 print_usage ();
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200
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201 return retval;
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202 }
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203
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204 /*
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205 %!test
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206 %! old_wstate = warning ("query");
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207 %! unwind_protect
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208 %! trigger = onCleanup (@() warning ("on", "__MY_WARNING__"));
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209 %! warning ("off", "__MY_WARNING__");
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210 %! assert ((warning ("query", "__MY_WARNING__")).state, "off");
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211 %! clear trigger;
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212 %! assert ((warning ("query", "__MY_WARNING__")).state, "on");
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213 %! unwind_protect_cleanup
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214 %! warning (old_wstate);
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215 %! end_unwind_protect
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216 */