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1 /* |
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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 2, or (at your option) any |
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10 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, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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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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26 |
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27 #include <cstddef> |
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28 |
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29 #include <string> |
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30 #include <stack> |
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31 |
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32 class |
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33 OCTINTERP_API |
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34 unwind_elem |
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35 { |
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36 public: |
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37 |
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38 typedef void (*cleanup_func) (void *ptr); |
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39 |
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40 unwind_elem (void) |
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41 : ue_tag (), ue_fptr (0), ue_ptr (0) { } |
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42 |
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43 unwind_elem (const std::string &t) |
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44 : ue_tag (t), ue_fptr (0), ue_ptr (0) { } |
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45 |
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46 unwind_elem (cleanup_func f, void *p) |
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47 : ue_tag (), ue_fptr (f), ue_ptr (p) { } |
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48 |
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49 unwind_elem (const unwind_elem& el) |
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50 : ue_tag (el.ue_tag), ue_fptr (el.ue_fptr), ue_ptr (el.ue_ptr) { } |
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51 |
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52 ~unwind_elem (void) { } |
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53 |
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54 unwind_elem& operator = (const unwind_elem& el) |
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55 { |
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56 ue_tag = el.ue_tag; |
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57 ue_fptr = el.ue_fptr; |
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58 ue_ptr = el.ue_ptr; |
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59 |
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60 return *this; |
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61 } |
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62 |
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63 std::string tag (void) { return ue_tag; } |
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64 |
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65 cleanup_func fptr (void) { return ue_fptr; } |
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66 |
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67 void *ptr (void) { return ue_ptr; } |
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68 |
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69 private: |
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70 |
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71 std::string ue_tag; |
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72 |
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73 cleanup_func ue_fptr; |
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74 |
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75 void *ue_ptr; |
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76 }; |
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77 |
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78 class |
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79 OCTINTERP_API |
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80 unwind_protect |
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81 { |
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82 public: |
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83 |
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84 static void add (unwind_elem::cleanup_func fptr, void *ptr); |
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85 |
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86 static void run (void); |
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87 |
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88 static void discard (void); |
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89 |
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90 static void begin_frame (const std::string& tag); |
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91 |
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92 static void run_frame (const std::string& tag); |
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93 |
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94 static void discard_frame (const std::string& tag); |
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95 |
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96 static void run_all (void); |
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97 |
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98 static void discard_all (void); |
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99 |
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100 // Ways to save variables. |
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101 |
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102 static void save_bool (bool *ptr, bool value); |
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103 |
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104 static void save_int (int *ptr, int value); |
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105 |
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106 static void save_str (std::string *ptr, const std::string& value); |
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107 |
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108 static void save_ptr (void **ptr, void *value); |
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109 |
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110 static void save_var (void *ptr, void *value, size_t size); |
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111 |
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112 static std::stack<unwind_elem> elt_list; |
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113 }; |
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114 |
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115 // We could get by without these macros, but they are nice to have... |
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116 |
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117 #define unwind_protect_bool(b) \ |
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118 unwind_protect::save_bool (&(b), (b)) |
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119 |
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120 #define unwind_protect_int(i) \ |
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121 unwind_protect::save_int (&(i), (i)) |
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122 |
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123 #define unwind_protect_str(s) \ |
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124 unwind_protect::save_str (&(s), (s)) |
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125 |
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126 #define unwind_protect_ptr(p) \ |
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127 unwind_protect::save_ptr (reinterpret_cast<void **> (&(p)), \ |
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128 reinterpret_cast<void *> (p)) |
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129 |
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130 #define unwind_protect_fptr(p) \ |
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131 unwind_protect::save_ptr (reinterpret_cast<void **> (&(p)), \ |
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132 FCN_PTR_CAST (void *, p)) |
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133 |
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134 #define unwind_protect_const_ptr(p) \ |
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135 unwind_protect::save_ptr (const_cast<void **> (reinterpret_cast<const void **> (&(p))), \ |
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136 const_cast<void *> (reinterpret_cast<const void *> (p))) |
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137 |
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138 #endif |
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139 |
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140 /* |
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141 ;;; Local Variables: *** |
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142 ;;; mode: C++ *** |
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143 ;;; End: *** |
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144 */ |
