annotate src/toplev.h @ 7877:59031cfe331b

lasterror fixes
author John W. Eaton <jwe@octave.org>
date Mon, 09 Jun 2008 14:47:25 -0400
parents 6b521b1e3631
children 73ef513855e7
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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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21
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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 "input.h"
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41 #include "oct-map.h"
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42
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43 extern OCTINTERP_API void
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44 clean_up_and_exit (int) GCC_ATTR_NORETURN;
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45
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46 extern OCTINTERP_API void recover_from_exception (void);
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47
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48 extern int main_loop (void);
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49
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50 extern OCTINTERP_API void
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51 do_octave_atexit (void);
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52
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53 extern OCTINTERP_API void
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54 octave_add_atexit_function (const std::string& fname);
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55
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56 extern OCTINTERP_API bool
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57 octave_remove_atexit_function (const std::string& fname);
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58
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59 // Current command to execute.
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60 extern OCTINTERP_API tree_statement_list *global_command;
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61
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62 // Pointer to parent function that is currently being evaluated.
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63 extern OCTINTERP_API octave_function *curr_parent_function;
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64
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65 // TRUE means we are ready to interpret commands, but not everything
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66 // is ready for interactive use.
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67 extern OCTINTERP_API bool octave_interpreter_ready;
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68
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69 // TRUE means we've processed all the init code and we are good to go.
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70 extern OCTINTERP_API bool octave_initialized;
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71
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72 class
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73 octave_call_stack
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74 {
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75 private:
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76
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77 struct call_stack_elt
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78 {
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79 call_stack_elt (octave_function *f, symbol_table::scope_id s,
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80 symbol_table::context_id c)
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81 : fcn (f), stmt (0), scope (s), context (c) { }
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82
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83 octave_function *fcn;
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84 tree_statement *stmt;
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85 symbol_table::scope_id scope;
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86 symbol_table::context_id context;
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87 };
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88
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89 protected:
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90
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91 octave_call_stack (void) : cs (), curr_frame (0) { }
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92
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93 public:
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94
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95 typedef std::deque<call_stack_elt>::iterator iterator;
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96 typedef std::deque<call_stack_elt>::const_iterator const_iterator;
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97 typedef std::deque<call_stack_elt>::difference_type difference_type;
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98
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99 static bool instance_ok (void)
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100 {
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101 bool retval = true;
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102
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103 if (! instance)
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104 instance = new octave_call_stack ();
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105
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106 if (! instance)
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107 {
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108 ::error ("unable to create call stack object!");
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109
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110 retval = false;
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111 }
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112
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113 return retval;
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114 }
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115
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116 // Current function (top of stack).
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117 static octave_function *current (void) { return top (); }
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118
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119 // Current statement (top of stack).
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120 static tree_statement *current_statement (void) { return top_statement (); }
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121
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122 // Current line in current function.
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123 static int current_line (void)
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124 {
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125 return instance_ok () ? instance->do_current_line () : -1;
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126 }
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127
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128 // Current column in current function.
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129 static int current_column (void)
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130 {
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131 return instance_ok () ? instance->do_current_column () : -1;
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132 }
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133
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134 // Line in user code caller.
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135 static int caller_user_code_line (difference_type q = 0)
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136 {
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137 return instance_ok () ? instance->do_caller_user_code_line (q) : -1;
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138 }
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139
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140 // Column in user code caller.
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141 static int caller_user_code_column (difference_type q = 0)
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142 {
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143 return instance_ok () ? instance->do_caller_user_code_column (q) : -1;
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144 }
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145
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146 // Caller function, may be built-in.
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147 static octave_function *caller (void)
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148 {
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149 return element (1);
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150 }
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151
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152 static size_t current_frame (void)
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153 {
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154 return instance_ok () ? instance->do_current_frame () : 0;
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155 }
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156
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157 // Function at location N on the call stack (N == 0 is current), may
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158 // be built-in.
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159 static octave_function *element (size_t n)
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160 {
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161 return instance_ok () ? instance->do_element (n) : 0;
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162 }
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163
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164 // First script on the stack.
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165 static octave_user_script *caller_script (difference_type q = 0)
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166 {
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167 return instance_ok () ? instance->do_caller_user_script (q) : 0;
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168 }
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169
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170 // First user-defined function on the stack.
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171 static octave_user_function *caller_user_function (difference_type q = 0)
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172 {
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173 return instance_ok () ? instance->do_caller_user_function (q) : 0;
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174 }
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175
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176 // First user-defined function on the stack.
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177 static octave_user_code *caller_user_code (difference_type q = 0)
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178 {
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179 return instance_ok () ? instance->do_caller_user_code (q) : 0;
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180 }
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181
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182 static void
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183 push (octave_function *f,
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184 symbol_table::scope_id scope = symbol_table::current_scope (),
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185 symbol_table::context_id context = 0)
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186 {
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187 if (instance_ok ())
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188 instance->do_push (f, scope, context);
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189 }
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190
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191 static octave_function *top (void)
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192 {
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193 return instance_ok () ? instance->do_top (): 0;
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194 }
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195
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196 static tree_statement *top_statement (void)
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197 {
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198 return instance_ok () ? instance->do_top_statement (): 0;
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199 }
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200
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201 static void set_statement (tree_statement *s)
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202 {
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203 if (instance_ok ())
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204 instance->do_set_statement (s);
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205 }
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206
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207 static bool goto_frame (size_t n = 0, bool verbose = false)
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208 {
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209 return instance_ok () ? instance->do_goto_frame (n, verbose) : false;
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210 }
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211
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212 static bool goto_frame_relative (int n, bool verbose = false)
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213 {
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214 return instance_ok ()
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215 ? instance->do_goto_frame_relative (n, verbose) : false;
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216 }
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217
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218 static Octave_map backtrace (int n = 0)
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219 {
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220 return instance_ok () ? instance->do_backtrace (n) : Octave_map ();
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221 }
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222
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223 static void pop (void)
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224 {
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225 if (instance_ok ())
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226 instance->do_pop ();
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227 }
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228
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229 // A function for popping the top of the call stack that is suitable
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230 // for use as an unwind_protect handler.
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231 static void unwind_pop (void *) { pop (); }
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232
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233 static void clear (void)
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234 {
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235 if (instance_ok ())
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236 instance->do_clear ();
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237 }
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238
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239 private:
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240
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241 // The current call stack.
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242 std::deque<call_stack_elt> cs;
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243
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244 size_t curr_frame;
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245
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246 static octave_call_stack *instance;
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247
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248 int do_current_line (void) const;
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249
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250 int do_current_column (void) const;
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251
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252 int do_caller_user_code_line (difference_type q = 0) const;
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253
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254 int do_caller_user_code_column (difference_type q = 0) const;
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255
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256 size_t do_current_frame (void) { return curr_frame; }
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257
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258 octave_function *do_element (size_t n)
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259 {
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260 octave_function *retval = 0;
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261
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262 if (cs.size () > n)
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263 {
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264 call_stack_elt& elt = cs[n];
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265 retval = elt.fcn;
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266 }
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267
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268 return retval;
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269 }
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270
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271 octave_user_script *do_caller_user_script (difference_type q = 0) const;
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272
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273 octave_user_function *do_caller_user_function (difference_type q = 0) const;
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274
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275 octave_user_code *do_caller_user_code (difference_type q = 0) const;
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276
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277 void do_push (octave_function *f, symbol_table::scope_id scope,
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278 symbol_table::context_id context)
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279 {
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280 if (Vdebugging)
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281 curr_frame++;
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282
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283 cs.push_front (call_stack_elt (f, scope, context));
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284 }
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285
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286 octave_function *do_top (void) const
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287 {
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288 octave_function *retval = 0;
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289
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290 if (! cs.empty ())
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291 {
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292 const call_stack_elt& elt = cs.front ();
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293 retval = elt.fcn;
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294 }
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295
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296 return retval;
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297 }
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298
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299 tree_statement *do_top_statement (void) const
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300 {
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301 tree_statement *retval = 0;
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302
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303 if (! cs.empty ())
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304 {
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305 const call_stack_elt& elt = cs.front ();
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306 retval = elt.stmt;
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307 }
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308
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309 return retval;
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310 }
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311
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312 void do_set_statement (tree_statement *s)
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313 {
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314 if (! cs.empty ())
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315 {
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316 call_stack_elt& elt = cs.front ();
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317 elt.stmt = s;
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318 }
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319 }
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320
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321 Octave_map do_backtrace (int n) const;
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322
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323 bool do_goto_frame (size_t n, bool verbose);
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324
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325 bool do_goto_frame_relative (int n, bool verbose);
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326
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327 void do_pop (void)
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328 {
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329 if (! cs.empty ())
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330 {
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331 if (Vdebugging)
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332 curr_frame--;
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333
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334 cs.pop_front ();
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335 }
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336 }
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337
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338 void do_clear (void) { cs.clear (); }
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339 };
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340
1
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341 #endif
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342
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343 /*
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344 ;;; Local Variables: ***
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345 ;;; mode: C++ ***
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346 ;;; End: ***
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347 */