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1 /* |
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2 |
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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include "defun.h" |
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28 #include "error.h" |
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29 #include "pt-cmd.h" |
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30 #include "ov.h" |
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31 #include "oct-lvalue.h" |
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32 #include "pt-decl.h" |
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33 #include "pt-exp.h" |
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34 #include "pt-id.h" |
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35 #include "pt-walk.h" |
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36 #include "utils.h" |
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37 #include "variables.h" |
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38 |
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39 // Declarations (global, static, etc.). |
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40 |
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41 tree_decl_elt::~tree_decl_elt (void) |
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42 { |
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43 delete id; |
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44 delete expr; |
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45 } |
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46 |
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47 void |
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48 tree_decl_elt::accept (tree_walker& tw) |
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49 { |
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50 tw.visit_decl_elt (*this); |
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51 } |
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52 |
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53 // Initializer lists for declaration statements. |
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54 |
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55 void |
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56 tree_decl_init_list::eval (tree_decl_elt::eval_fcn f) |
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57 { |
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58 for (iterator p = begin (); p != end (); p++) |
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59 { |
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60 tree_decl_elt *elt = *p; |
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61 |
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62 f (*elt); |
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63 |
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64 if (error_state) |
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65 break; |
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66 } |
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67 } |
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68 |
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69 void |
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70 tree_decl_init_list::accept (tree_walker& tw) |
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71 { |
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72 tw.visit_decl_init_list (*this); |
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73 } |
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74 |
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75 // Base class for declaration commands (global, static). |
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76 |
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77 tree_decl_command::~tree_decl_command (void) |
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78 { |
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79 delete init_list; |
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80 } |
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81 |
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82 void |
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83 tree_decl_command::accept (tree_walker& tw) |
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84 { |
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85 tw.visit_decl_command (*this); |
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86 } |
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87 |
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88 // Global. |
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89 |
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90 void |
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91 tree_global_command::do_init (tree_decl_elt& elt) |
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92 { |
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93 tree_identifier *id = elt.ident (); |
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94 |
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95 if (id) |
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96 { |
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97 id->link_to_global (); |
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98 |
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99 if (! error_state) |
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100 { |
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101 octave_lvalue ult = id->lvalue (); |
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102 |
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103 if (ult.is_undefined ()) |
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104 { |
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105 tree_expression *expr = elt.expression (); |
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106 |
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107 octave_value init_val; |
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108 |
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109 if (expr) |
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110 init_val = expr->rvalue (); |
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111 else |
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112 init_val = Matrix (); |
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113 |
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114 ult.assign (octave_value::op_asn_eq, init_val); |
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115 } |
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116 } |
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117 } |
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118 } |
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119 |
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120 void |
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121 tree_global_command::eval (void) |
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122 { |
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123 if (init_list) |
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124 { |
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125 init_list->eval (do_init); |
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126 |
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127 initialized = true; |
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128 } |
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129 |
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130 if (error_state) |
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131 ::error ("evaluating global command near line %d, column %d", |
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132 line (), column ()); |
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133 } |
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134 |
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135 // Static. |
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136 |
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137 void |
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138 tree_static_command::do_init (tree_decl_elt& elt) |
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139 { |
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140 tree_identifier *id = elt.ident (); |
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141 |
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142 if (id) |
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143 { |
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144 id->mark_as_static (); |
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145 |
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146 octave_lvalue ult = id->lvalue (); |
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147 |
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148 if (ult.is_undefined ()) |
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149 { |
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150 tree_expression *expr = elt.expression (); |
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151 |
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152 octave_value init_val; |
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153 |
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154 if (expr) |
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155 init_val = expr->rvalue (); |
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156 else |
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157 init_val = Matrix (); |
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158 |
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159 ult.assign (octave_value::op_asn_eq, init_val); |
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160 } |
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161 } |
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162 } |
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163 |
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164 void |
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165 tree_static_command::eval (void) |
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166 { |
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167 // Static variables only need to be marked and initialized once. |
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168 |
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169 if (init_list && ! initialized) |
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170 { |
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171 init_list->eval (do_init); |
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172 |
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173 initialized = true; |
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174 |
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175 if (error_state) |
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176 ::error ("evaluating static command near line %d, column %d", |
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177 line (), column ()); |
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178 } |
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179 } |
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180 |
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181 /* |
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182 ;;; Local Variables: *** |
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183 ;;; mode: C++ *** |
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184 ;;; End: *** |
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185 */ |
