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annotate src/pt-eval.h @ 15536:2e8eb9ac43a5 stable rc-3-6-4-0

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3.6.4-rc0 release candidate * configure.ac (AC_INIT): Version is now 3.6.2-rc0. (OCTAVE_RELEASE_DATE): Now 2012-05-11.
author John W. Eaton <jwe@octave.org>
date Wed, 17 Oct 2012 10:05:44 -0400
parents 72c96de7a403
children 9e3983c8963c
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1 /*
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2
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3 Copyright (C) 2009-2012 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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21 */
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22
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23 #if !defined (octave_tree_eval_h)
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24 #define octave_tree_eval_h 1
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25
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26 #include <stack>
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27 #include <string>
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28
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29 #include "comment-list.h"
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30 #include "oct-obj.h"
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31 #include "pt-walk.h"
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32
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33 class tree_expression;
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34
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35 // How to evaluate the code that the parse trees represent.
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36
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37 class
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38 OCTINTERP_API
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39 tree_evaluator : public tree_walker
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40 {
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41 public:
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42
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43 typedef void (*decl_elt_init_fcn) (tree_decl_elt&);
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44
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45 tree_evaluator (void) { }
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46
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47 ~tree_evaluator (void) { }
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48
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49 void visit_anon_fcn_handle (tree_anon_fcn_handle&);
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50
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51 void visit_argument_list (tree_argument_list&);
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52
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53 void visit_binary_expression (tree_binary_expression&);
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54
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55 void visit_break_command (tree_break_command&);
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56
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57 void visit_colon_expression (tree_colon_expression&);
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58
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59 void visit_continue_command (tree_continue_command&);
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60
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61 void visit_global_command (tree_global_command&);
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62
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63 void visit_static_command (tree_static_command&);
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64
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65 void visit_decl_elt (tree_decl_elt&);
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66
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67 void visit_decl_init_list (tree_decl_init_list&);
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68
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69 void visit_simple_for_command (tree_simple_for_command&);
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70
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71 void visit_complex_for_command (tree_complex_for_command&);
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72
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73 void visit_octave_user_script (octave_user_script&);
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74
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75 void visit_octave_user_function (octave_user_function&);
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76
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77 void visit_octave_user_function_header (octave_user_function&);
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78
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79 void visit_octave_user_function_trailer (octave_user_function&);
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80
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81 void visit_function_def (tree_function_def&);
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82
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83 void visit_identifier (tree_identifier&);
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84
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85 void visit_if_clause (tree_if_clause&);
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86
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87 void visit_if_command (tree_if_command&);
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88
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89 void visit_if_command_list (tree_if_command_list&);
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90
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91 void visit_index_expression (tree_index_expression&);
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92
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93 void visit_matrix (tree_matrix&);
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94
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95 void visit_cell (tree_cell&);
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96
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97 void visit_multi_assignment (tree_multi_assignment&);
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98
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99 void visit_no_op_command (tree_no_op_command&);
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100
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101 void visit_constant (tree_constant&);
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102
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103 void visit_fcn_handle (tree_fcn_handle&);
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104
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105 void visit_parameter_list (tree_parameter_list&);
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106
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107 void visit_postfix_expression (tree_postfix_expression&);
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108
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109 void visit_prefix_expression (tree_prefix_expression&);
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110
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111 void visit_return_command (tree_return_command&);
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112
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113 void visit_return_list (tree_return_list&);
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114
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115 void visit_simple_assignment (tree_simple_assignment&);
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116
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117 void visit_statement (tree_statement&);
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118
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119 void visit_statement_list (tree_statement_list&);
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120
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121 void visit_switch_case (tree_switch_case&);
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122
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123 void visit_switch_case_list (tree_switch_case_list&);
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124
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125 void visit_switch_command (tree_switch_command&);
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126
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127 void visit_try_catch_command (tree_try_catch_command&);
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128
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129 void do_unwind_protect_cleanup_code (tree_statement_list *list);
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130
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131 void visit_unwind_protect_command (tree_unwind_protect_command&);
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132
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133 void visit_while_command (tree_while_command&);
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134
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135 void visit_do_until_command (tree_do_until_command&);
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136
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137 static void reset_debug_state (void);
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138
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139 // If > 0, stop executing at the (N-1)th stopping point, counting
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140 // from the the current execution point in the current frame.
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141 //
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142 // If < 0, stop executing at the next possible stopping point.
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143 static int dbstep_flag;
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144
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145 // The number of the stack frame we are currently debugging.
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146 static size_t current_frame;
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147
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148 static bool debug_mode;
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149
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150 // Possible types of evaluation contexts.
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151 enum stmt_list_type
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152 {
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153 function, // function body
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154 script, // script file
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155 other // command-line input or eval string
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156 };
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157
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158 // The context for the current evaluation.
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159 static stmt_list_type statement_context;
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160
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161 // TRUE means we are evaluating some kind of looping construct.
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162 static bool in_loop_command;
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163
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164 private:
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165
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166 void do_decl_init_list (decl_elt_init_fcn fcn,
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167 tree_decl_init_list *init_list);
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168
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169 void do_breakpoint (tree_statement& stmt) const;
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170
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171 void do_breakpoint (bool is_breakpoint,
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172 bool is_end_of_fcn_or_script = false) const;
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173
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174 virtual octave_value
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175 do_keyboard (const octave_value_list& args = octave_value_list ()) const;
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176
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177 // No copying!
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178
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179 tree_evaluator (const tree_evaluator&);
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180
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181 tree_evaluator& operator = (const tree_evaluator&);
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182 };
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183
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184 extern tree_evaluator *current_evaluator;
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185
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186 // Maximum nesting level for functions, scripts, or sourced files called
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187 // recursively.
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188 extern int Vmax_recursion_depth;
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189
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190 #endif