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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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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 #if !defined (octave_unwind_prot_h) |
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24 #define octave_unwind_prot_h 1 |
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25 |
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26 #include <cstddef> |
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27 |
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28 #include <string> |
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29 #include <stack> |
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30 |
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31 class |
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32 OCTINTERP_API |
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33 unwind_elem |
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34 { |
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35 public: |
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36 |
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37 typedef void (*cleanup_func) (void *ptr); |
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38 |
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39 unwind_elem (void) |
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40 : ue_tag (), ue_fptr (0), ue_ptr (0) { } |
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41 |
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42 unwind_elem (const std::string &t) |
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43 : ue_tag (t), ue_fptr (0), ue_ptr (0) { } |
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44 |
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45 unwind_elem (cleanup_func f, void *p) |
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46 : ue_tag (), ue_fptr (f), ue_ptr (p) { } |
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47 |
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48 unwind_elem (const unwind_elem& el) |
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49 : ue_tag (el.ue_tag), ue_fptr (el.ue_fptr), ue_ptr (el.ue_ptr) { } |
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50 |
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51 ~unwind_elem (void) { } |
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52 |
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53 unwind_elem& operator = (const unwind_elem& el) |
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54 { |
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55 ue_tag = el.ue_tag; |
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56 ue_fptr = el.ue_fptr; |
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57 ue_ptr = el.ue_ptr; |
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58 |
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59 return *this; |
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60 } |
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61 |
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62 std::string tag (void) { return ue_tag; } |
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63 |
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64 cleanup_func fptr (void) { return ue_fptr; } |
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65 |
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66 void *ptr (void) { return ue_ptr; } |
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67 |
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68 private: |
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69 |
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70 std::string ue_tag; |
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71 |
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72 cleanup_func ue_fptr; |
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73 |
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74 void *ue_ptr; |
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75 }; |
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76 |
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77 class |
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78 OCTINTERP_API |
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79 unwind_protect |
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80 { |
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81 public: |
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82 |
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83 static void add (unwind_elem::cleanup_func fptr, void *ptr); |
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84 |
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85 static void run (void); |
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86 |
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87 static void discard (void); |
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88 |
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89 static void begin_frame (const std::string& tag); |
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90 |
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91 static void run_frame (const std::string& tag); |
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92 |
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93 static void discard_frame (const std::string& tag); |
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94 |
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95 static void run_all (void); |
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96 |
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97 static void discard_all (void); |
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98 |
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99 // Ways to save variables. |
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100 |
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101 static void save_bool (bool *ptr, bool value); |
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102 |
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103 static void save_int (int *ptr, int value); |
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104 |
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105 static void save_str (std::string *ptr, const std::string& value); |
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106 |
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107 static void save_ptr (void **ptr, void *value); |
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108 |
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109 static void save_var (void *ptr, void *value, size_t size); |
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110 |
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111 static std::stack<unwind_elem> elt_list; |
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112 }; |
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113 |
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114 // We could get by without these macros, but they are nice to have... |
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115 |
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116 #define unwind_protect_bool(b) \ |
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117 unwind_protect::save_bool (&(b), (b)) |
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118 |
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119 #define unwind_protect_int(i) \ |
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120 unwind_protect::save_int (&(i), (i)) |
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121 |
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122 #define unwind_protect_str(s) \ |
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123 unwind_protect::save_str (&(s), (s)) |
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124 |
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125 #define unwind_protect_ptr(p) \ |
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126 unwind_protect::save_ptr (reinterpret_cast<void **> (&(p)), \ |
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127 reinterpret_cast<void *> (p)) |
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128 |
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129 #define unwind_protect_fptr(p) \ |
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130 unwind_protect::save_ptr (reinterpret_cast<void **> (&(p)), \ |
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131 FCN_PTR_CAST (void *, p)) |
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132 |
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133 #define unwind_protect_const_ptr(p) \ |
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134 unwind_protect::save_ptr (const_cast<void **> (reinterpret_cast<const void **> (&(p))), \ |
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135 const_cast<void *> (reinterpret_cast<const void *> (p))) |
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136 |
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137 #endif |
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138 |
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139 /* |
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140 ;;; Local Variables: *** |
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141 ;;; mode: C++ *** |
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142 ;;; End: *** |
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143 */ |
