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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 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 #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 bool |
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48 tree_decl_elt::eval (void) |
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49 { |
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50 bool retval = false; |
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51 |
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52 if (id && expr) |
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53 { |
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54 octave_lvalue ult = id->lvalue (); |
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55 |
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56 octave_value init_val = expr->rvalue (); |
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57 |
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58 if (! error_state) |
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59 { |
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60 ult.assign (octave_value::op_asn_eq, init_val); |
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61 |
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62 retval = true; |
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63 } |
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64 } |
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65 |
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66 return retval; |
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67 } |
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68 |
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69 tree_decl_elt * |
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70 tree_decl_elt::dup (symbol_table *sym_tab) |
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71 { |
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72 return new tree_decl_elt (id ? id->dup (sym_tab) : 0, |
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73 expr ? expr->dup (sym_tab) : 0); |
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74 } |
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75 |
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76 void |
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77 tree_decl_elt::accept (tree_walker& tw) |
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78 { |
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79 tw.visit_decl_elt (*this); |
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80 } |
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81 |
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82 // Initializer lists for declaration statements. |
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83 |
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84 void |
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85 tree_decl_init_list::eval (tree_decl_elt::eval_fcn f) |
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86 { |
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87 for (iterator p = begin (); p != end (); p++) |
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88 { |
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89 tree_decl_elt *elt = *p; |
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90 |
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91 f (*elt); |
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92 |
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93 if (error_state) |
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94 break; |
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95 } |
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96 } |
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97 |
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98 tree_decl_init_list * |
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99 tree_decl_init_list::dup (symbol_table *sym_tab) |
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100 { |
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101 tree_decl_init_list *new_dil = new tree_decl_init_list (); |
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102 |
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103 for (iterator p = begin (); p != end (); p++) |
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104 { |
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105 tree_decl_elt *elt = *p; |
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106 |
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107 new_dil->append (elt ? elt->dup (sym_tab) : 0); |
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108 } |
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109 |
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110 return new_dil; |
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111 } |
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112 |
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113 void |
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114 tree_decl_init_list::accept (tree_walker& tw) |
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115 { |
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116 tw.visit_decl_init_list (*this); |
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117 } |
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118 |
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119 // Base class for declaration commands (global, static). |
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120 |
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121 tree_decl_command::~tree_decl_command (void) |
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122 { |
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123 delete init_list; |
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124 } |
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125 |
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126 void |
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127 tree_decl_command::accept (tree_walker& tw) |
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128 { |
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129 tw.visit_decl_command (*this); |
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130 } |
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131 |
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132 // Global. |
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133 |
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134 void |
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135 tree_global_command::do_init (tree_decl_elt& elt) |
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136 { |
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137 tree_identifier *id = elt.ident (); |
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138 |
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139 if (id) |
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140 { |
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141 id->link_to_global (); |
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142 |
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143 if (! error_state) |
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144 { |
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145 octave_lvalue ult = id->lvalue (); |
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146 |
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147 if (ult.is_undefined ()) |
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148 { |
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149 tree_expression *expr = elt.expression (); |
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150 |
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151 octave_value init_val; |
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152 |
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153 if (expr) |
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154 init_val = expr->rvalue (); |
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155 else |
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156 init_val = Matrix (); |
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157 |
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158 ult.assign (octave_value::op_asn_eq, init_val); |
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159 } |
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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_global_command::eval (void) |
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166 { |
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167 if (init_list) |
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168 { |
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169 init_list->eval (do_init); |
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170 |
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171 initialized = true; |
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172 } |
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173 |
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174 if (error_state) |
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175 ::error ("evaluating global command near line %d, column %d", |
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176 line (), column ()); |
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177 } |
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178 |
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179 tree_command * |
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180 tree_global_command::dup (symbol_table *sym_tab) |
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181 { |
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182 return new tree_global_command (init_list ? init_list->dup (sym_tab) : 0, |
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183 line (), column ()); |
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184 } |
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185 |
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186 // Static. |
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187 |
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188 void |
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189 tree_static_command::do_init (tree_decl_elt& elt) |
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190 { |
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191 tree_identifier *id = elt.ident (); |
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192 |
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193 if (id) |
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194 { |
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195 id->mark_as_static (); |
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196 |
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197 octave_lvalue ult = id->lvalue (); |
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198 |
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199 if (ult.is_undefined ()) |
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200 { |
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201 tree_expression *expr = elt.expression (); |
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202 |
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203 octave_value init_val; |
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204 |
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205 if (expr) |
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206 init_val = expr->rvalue (); |
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207 else |
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208 init_val = Matrix (); |
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209 |
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210 ult.assign (octave_value::op_asn_eq, init_val); |
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211 } |
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212 } |
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213 } |
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214 |
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215 void |
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216 tree_static_command::eval (void) |
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217 { |
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218 // Static variables only need to be marked and initialized once. |
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219 |
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220 if (init_list && ! initialized) |
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221 { |
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222 init_list->eval (do_init); |
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223 |
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224 initialized = true; |
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225 |
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226 if (error_state) |
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227 ::error ("evaluating static command near line %d, column %d", |
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228 line (), column ()); |
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229 } |
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230 } |
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231 |
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232 tree_command * |
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233 tree_static_command::dup (symbol_table *sym_tab) |
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234 { |
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235 return new tree_static_command (init_list ? init_list->dup (sym_tab) : 0, |
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236 line (), column ()); |
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237 } |
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238 |
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239 /* |
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240 ;;; Local Variables: *** |
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241 ;;; mode: C++ *** |
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242 ;;; End: *** |
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243 */ |
