annotate src/toplev.h @ 7736:a059b5679fbb

implement dbstack
author John W. Eaton <jwe@octave.org>
date Fri, 25 Apr 2008 15:11:03 -0400
parents 2dee19385d32
children 40c428ea3408
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1 /*
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2
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3 Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002,
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4 2003, 2004, 2005, 2006, 2007 John W. Eaton
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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.
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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_toplev_h)
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25 #define octave_toplev_h 1
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27 #include <cstdio>
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28
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29 #include <deque>
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30 #include <string>
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31
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32 class octave_value;
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33 class octave_value_list;
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34 class octave_function;
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35 class octave_user_script;
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36 class tree_statement;
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37 class tree_statement_list;
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38 class charMatrix;
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39
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40 #include "oct-map.h"
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41
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42 extern OCTINTERP_API void
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43 clean_up_and_exit (int) GCC_ATTR_NORETURN;
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45 extern OCTINTERP_API void recover_from_exception (void);
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46
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47 extern int main_loop (void);
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49 extern OCTINTERP_API void
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50 do_octave_atexit (void);
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51
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52 extern OCTINTERP_API void
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53 octave_add_atexit_function (const std::string& fname);
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54
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55 extern OCTINTERP_API bool
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56 octave_remove_atexit_function (const std::string& fname);
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57
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58 // Current command to execute.
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59 extern OCTINTERP_API tree_statement_list *global_command;
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61 // Pointer to parent function that is currently being evaluated.
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62 extern OCTINTERP_API octave_function *curr_parent_function;
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63
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64 // TRUE means we are ready to interpret commands, but not everything
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65 // is ready for interactive use.
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66 extern OCTINTERP_API bool octave_interpreter_ready;
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67
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68 // TRUE means we've processed all the init code and we are good to go.
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69 extern OCTINTERP_API bool octave_initialized;
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70
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71 class
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72 octave_call_stack
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73 {
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74 private:
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75
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76 struct call_stack_elt
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77 {
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78 call_stack_elt (octave_function *f) : fcn (f), stmt (0) { }
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79
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80 octave_function *fcn;
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81 tree_statement *stmt;
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82 };
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83
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84 protected:
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85
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86 octave_call_stack (void) : cs () { }
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87
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88 public:
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89
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90 typedef std::deque<call_stack_elt>::iterator iterator;
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91 typedef std::deque<call_stack_elt>::const_iterator const_iterator;
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92
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93 static bool instance_ok (void)
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94 {
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95 bool retval = true;
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96
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97 if (! instance)
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98 instance = new octave_call_stack ();
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99
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100 if (! instance)
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101 {
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102 ::error ("unable to create call stack object!");
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103
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104 retval = false;
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105 }
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106
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107 return retval;
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108 }
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109
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110 // Current function (top of stack).
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111 static octave_function *current (void) { return top (); }
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112
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113 // Current statement (top of stack).
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114 static tree_statement *current_statement (void) { return top_statement (); }
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115
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116 // Current line in current function.
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117 static int current_line (void)
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118 {
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119 return instance_ok () ? instance->do_current_line () : 0;
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120 }
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121
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122 // Current column in current function.
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123 static int current_column (void)
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124 {
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125 return instance_ok () ? instance->do_current_column () : 0;
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126 }
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127
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128 // Caller function, may be built-in.
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129 static octave_function *caller (void)
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130 {
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131 return element (1);
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132 }
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133
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134 // Function at location N on the call stack (N == 0 is current), may
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135 // be built-in.
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136 static octave_function *element (size_t n)
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137 {
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138 return instance_ok () ? instance->do_element (n) : 0;
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139 }
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140
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141 // First script on the stack.
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142 static octave_user_script *caller_script (void)
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143 {
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144 return instance_ok () ? instance->do_caller_user_script () : 0;
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145 }
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146
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147 // First user-defined function on the stack.
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148 static octave_user_function *caller_user_function (void)
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149 {
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150 return instance_ok () ? instance->do_caller_user_function () : 0;
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151 }
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152
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153 // First user-defined function on the stack.
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154 static octave_user_code *caller_user_code (void)
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155 {
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156 return instance_ok () ? instance->do_caller_user_code () : 0;
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157 }
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158
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159 static void push (octave_function *f)
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160 {
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161 if (instance_ok ())
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162 instance->do_push (f);
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163 }
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164
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165 static octave_function *top (void)
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166 {
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167 return instance_ok () ? instance->do_top (): 0;
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168 }
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169
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170 static tree_statement *top_statement (void)
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171 {
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172 return instance_ok () ? instance->do_top_statement (): 0;
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173 }
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174
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175 static void set_statement (tree_statement *s)
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176 {
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177 if (instance_ok ())
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178 instance->do_set_statement (s);
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179 }
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180
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181 static Octave_map backtrace (int n = 0)
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182 {
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183 return instance_ok () ? instance->do_backtrace (n) : Octave_map ();
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184 }
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185
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186 static void pop (void)
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187 {
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188 if (instance_ok ())
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189 instance->do_pop ();
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190 }
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191
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192 // A function for popping the top of the call stack that is suitable
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193 // for use as an unwind_protect handler.
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194 static void unwind_pop (void *) { pop (); }
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195
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196 static void clear (void)
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197 {
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198 if (instance_ok ())
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199 instance->do_clear ();
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200 }
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201
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202 private:
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203
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204 // The current call stack.
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205 std::deque<call_stack_elt> cs;
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206
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207 static octave_call_stack *instance;
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208
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209 int do_current_line (void) const;
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210
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211 int do_current_column (void) const;
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212
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213 octave_function *do_element (size_t n)
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214 {
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215 octave_function *retval = 0;
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216
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217 if (cs.size () > n)
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218 {
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219 call_stack_elt& elt = cs[n];
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220 retval = elt.fcn;
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221 }
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222
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223 return retval;
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224 }
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225
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226 octave_user_script *do_caller_user_script (void) const;
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227
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228 octave_user_function *do_caller_user_function (void) const;
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229
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230 octave_user_code *do_caller_user_code (void) const;
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231
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232 void do_push (octave_function *f)
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233 {
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234 cs.push_front (call_stack_elt (f));
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235 }
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236
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237 octave_function *do_top (void) const
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238 {
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239 octave_function *retval = 0;
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240
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241 if (! cs.empty ())
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242 {
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243 const call_stack_elt& elt = cs.front ();
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244 retval = elt.fcn;
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245 }
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246
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247 return retval;
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248 }
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249
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250 tree_statement *do_top_statement (void) const
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251 {
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252 tree_statement *retval = 0;
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253
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254 if (! cs.empty ())
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255 {
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256 const call_stack_elt& elt = cs.front ();
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257 retval = elt.stmt;
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258 }
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259
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260 return retval;
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261 }
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262
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263 void do_set_statement (tree_statement *s)
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264 {
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265 if (! cs.empty ())
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266 {
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267 call_stack_elt& elt = cs.front ();
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268 elt.stmt = s;
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269 }
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270 }
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271
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272 Octave_map do_backtrace (int n) const;
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273
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274 void do_pop (void)
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275 {
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276 if (! cs.empty ())
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277 cs.pop_front ();
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278 }
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279
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280 void do_clear (void) { cs.clear (); }
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281 };
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282
1
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283 #endif
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284
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285 /*
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286 ;;; Local Variables: ***
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287 ;;; mode: C++ ***
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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288 ;;; End: ***
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289 */