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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 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_toplev_h) |
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24 #define octave_toplev_h 1 |
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25 |
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26 #include <cstdio> |
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27 |
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28 #include <list> |
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29 #include <string> |
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30 |
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31 class octave_value; |
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32 class octave_value_list; |
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33 class octave_function; |
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34 class octave_user_script; |
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35 class tree_statement_list; |
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36 class charMatrix; |
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37 |
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38 extern void |
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39 clean_up_and_exit (int) GCC_ATTR_NORETURN; |
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40 |
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41 extern int main_loop (void); |
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42 |
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43 extern void |
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44 do_octave_atexit (void); |
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45 |
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46 // Current command to execute. |
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47 extern tree_statement_list *global_command; |
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48 |
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49 // Pointer to parent function that is currently being evaluated. |
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50 extern octave_function *curr_parent_function; |
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51 |
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52 // TRUE means we are ready to interpret commands, but not everything |
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53 // is ready for interactive use. |
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54 extern bool octave_interpreter_ready; |
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55 |
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56 // TRUE means we've processed all the init code and we are good to go. |
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57 extern bool octave_initialized; |
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58 |
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59 class |
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60 octave_call_stack |
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61 { |
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62 protected: |
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63 |
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64 octave_call_stack (void) : cs () { } |
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65 |
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66 public: |
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67 |
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68 typedef std::list<octave_function *>::iterator iterator ; |
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69 |
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70 static bool instance_ok (void) |
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71 { |
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72 bool retval = true; |
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73 |
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74 if (! instance) |
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75 instance = new octave_call_stack (); |
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76 |
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77 if (! instance) |
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78 { |
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79 ::error ("unable to create call stack object!"); |
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80 |
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81 retval = false; |
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82 } |
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83 |
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84 return retval; |
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85 } |
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86 |
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87 // Current function (top of stack). |
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88 static octave_function *current (void) { return top (); } |
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89 |
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90 // Caller function, may be built-in. |
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91 static octave_function *caller (void) |
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92 { |
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93 return instance_ok () ? instance->do_caller (): 0; |
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94 } |
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95 |
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96 // First script on the stack. |
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97 static octave_user_script *caller_script (void) |
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98 { |
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99 return instance_ok () ? instance->do_caller_user_script (): 0; |
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100 } |
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101 |
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102 // First user-defined function on the stack. |
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103 static octave_user_function *caller_user_function (void) |
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104 { |
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105 return instance_ok () ? instance->do_caller_user_function (): 0; |
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106 } |
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107 |
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108 // First user-defined function on the stack. |
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109 static octave_function *caller_user_script_or_function (void) |
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110 { |
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111 return instance_ok () ? instance->do_caller_user_script_or_function (): 0; |
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112 } |
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113 |
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114 static void push (octave_function *f) |
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115 { |
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116 if (instance_ok ()) |
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117 instance->do_push (f); |
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118 } |
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119 |
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120 static octave_function *top (void) |
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121 { |
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122 return instance_ok () ? instance->do_top (): 0; |
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123 } |
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124 |
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125 static void pop (void) |
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126 { |
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127 if (instance_ok ()) |
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128 instance->do_pop (); |
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129 } |
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130 |
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131 // A function for popping the top of the call stack that is suitable |
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132 // for use as an unwind_protect handler. |
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133 static void unwind_pop (void *) { pop (); } |
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134 |
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135 // A function for popping an octave_user_script from the top of the |
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136 // call stack that is suitable for use as an unwind_protect handler. |
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137 static void unwind_pop_script (void *); |
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138 |
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139 static void clear (void) |
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140 { |
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141 if (instance_ok ()) |
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142 instance->do_clear (); |
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143 } |
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144 |
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145 private: |
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146 |
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147 // The current call stack. |
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148 std::list<octave_function *> cs; |
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149 |
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150 static octave_call_stack *instance; |
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151 |
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152 octave_function *do_caller (void); |
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153 |
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154 octave_user_script *do_caller_user_script (void); |
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155 |
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156 octave_user_function *do_caller_user_function (void); |
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157 |
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158 octave_function *do_caller_user_script_or_function (void); |
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159 |
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160 void do_push (octave_function *f) { cs.push_front (f); } |
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161 |
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162 octave_function *do_top (void) { return cs.empty () ? 0 : cs.front (); } |
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163 |
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164 void do_pop (void) |
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165 { |
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166 if (! cs.empty ()) |
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167 cs.pop_front (); |
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168 } |
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169 |
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170 void do_clear (void) { cs.clear (); } |
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171 }; |
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172 |
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173 #endif |
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174 |
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175 /* |
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176 ;;; Local Variables: *** |
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177 ;;; mode: C++ *** |
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178 ;;; End: *** |
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179 */ |
