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1 // tree-cmd.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994, 1995 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 2, or (at your option) any |
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11 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, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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1192
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include <iostream.h> |
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29 |
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30 // Nonzero means we're breaking out of a loop or function body. |
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31 int breaking = 0; |
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32 |
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33 // Nonzero means we're jumping to the end of a loop. |
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34 int continuing = 0; |
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35 |
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36 // Nonzero means we're returning from a function. Global because it |
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37 // is also needed in tree-expr.cc. |
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38 int returning = 0; |
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39 |
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40 #include "user-prefs.h" |
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41 #include "variables.h" |
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42 #include "oct-map.h" |
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494
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43 #include "symtab.h" |
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44 #include "error.h" |
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45 #include "gripes.h" |
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584
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46 #include "tree-base.h" |
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47 #include "tree-expr.h" |
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48 #include "tree-cmd.h" |
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49 #include "tree-misc.h" |
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50 #include "tree-const.h" |
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51 #include "unwind-prot.h" |
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52 |
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53 // Decide if it's time to quit a for or while loop. |
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54 static inline int |
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55 quit_loop_now (void) |
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56 { |
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57 // Maybe handle `continue N' someday... |
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58 |
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59 if (continuing) |
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60 continuing--; |
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61 |
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62 int quit = (returning || breaking || continuing); |
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63 |
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64 if (breaking) |
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65 breaking--; |
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66 |
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67 return quit; |
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68 } |
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69 |
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70 // But first, some extra functions used by the tree classes. |
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71 |
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72 // We seem to have no use for this now. Maybe it will be needed at |
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73 // some future date, so here it is. |
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74 #if 0 |
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75 |
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76 // Convert a linked list of trees to a vector of pointers to trees. |
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77 |
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78 static tree ** |
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79 list_to_vector (tree *list, int& len) |
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80 { |
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81 len = list->length () + 1; |
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82 |
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83 tree **args = new tree * [len]; |
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84 |
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1228
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85 // args[0] may eventually hold something useful, like the function |
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86 // name. |
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87 |
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494
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88 tree *tmp_list = list; |
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89 for (int k = 1; k < len; k++) |
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90 { |
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91 args[k] = tmp_list; |
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92 tmp_list = tmp_list->next_elem (); |
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93 } |
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94 return args; |
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95 } |
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96 #endif |
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97 |
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578
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98 // Global. |
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99 |
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578
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100 tree_global_command::~tree_global_command (void) |
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101 { |
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578
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102 delete init_list; |
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103 } |
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104 |
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105 void |
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578
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106 tree_global_command::eval (void) |
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107 { |
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578
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108 if (init_list) |
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109 init_list->eval (); |
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110 |
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111 if (error_state > 0) |
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112 ::error ("evaluating global command near line %d, column %d", |
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113 line (), column ()); |
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114 } |
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115 |
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581
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116 void |
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117 tree_global_command::print_code (ostream& os) |
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118 { |
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119 print_code_indent (os); |
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120 |
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121 os << "global "; |
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122 |
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123 if (init_list) |
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124 init_list->print_code (os); |
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125 } |
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126 |
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578
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127 // While. |
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128 |
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129 tree_while_command::~tree_while_command (void) |
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130 { |
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131 delete expr; |
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132 delete list; |
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133 } |
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134 |
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578
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135 void |
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136 tree_while_command::eval (void) |
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137 { |
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138 if (error_state) |
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139 return; |
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140 |
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141 for (;;) |
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142 { |
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143 int expr_value = 0; |
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144 if (! expr) |
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145 return; |
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494
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146 tree_constant t1 = expr->eval (0); |
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147 |
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148 if (error_state) |
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149 { |
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150 eval_error (); |
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578
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151 return; |
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494
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152 } |
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153 |
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154 if (t1.rows () == 0 || t1.columns () == 0) |
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155 { |
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156 int flag = user_pref.propagate_empty_matrices; |
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157 if (flag < 0) |
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158 warning ("while: empty matrix used in conditional"); |
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159 else if (flag == 0) |
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160 { |
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620
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161 ::error ("empty matrix used in while condition near line\ |
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162 %d, column %d", line (), column ()); |
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163 return; |
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164 } |
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165 t1 = tree_constant (0.0); |
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166 } |
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167 else if (! t1.is_scalar_type ()) |
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168 { |
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169 tree_constant t2 = t1.all (); |
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170 t1 = t2.all (); |
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171 } |
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172 |
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620
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173 if (t1.is_real_scalar ()) |
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174 expr_value = (int) t1.double_value (); |
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620
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175 else if (t1.is_complex_scalar ()) |
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176 expr_value = t1.complex_value () != 0.0; |
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177 else |
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620
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178 { |
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179 ::error ("invalid type used in while condition near line %d,\ |
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180 column %d", line (), column ()); |
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181 return; |
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182 } |
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183 |
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184 if (expr_value) |
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185 { |
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186 if (list) |
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187 { |
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188 list->eval (1); |
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189 if (error_state) |
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190 { |
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191 eval_error (); |
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192 return; |
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494
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193 } |
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194 } |
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195 |
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196 if (quit_loop_now ()) |
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197 break; |
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198 } |
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199 else |
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200 break; |
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201 } |
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202 } |
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203 |
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204 void |
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205 tree_while_command::eval_error (void) |
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206 { |
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207 if (error_state > 0) |
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208 ::error ("evaluating while command near line %d, column %d", |
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209 line (), column ()); |
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210 } |
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211 |
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581
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212 void |
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213 tree_while_command::print_code (ostream& os) |
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214 { |
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215 print_code_indent (os); |
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216 |
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217 os << "while "; |
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218 |
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219 if (expr) |
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220 expr->print_code (os); |
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221 |
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222 print_code_new_line (os); |
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223 |
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224 if (list) |
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225 { |
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226 increment_indent_level (); |
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227 list->print_code (os); |
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228 decrement_indent_level (); |
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229 } |
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230 |
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231 print_code_indent (os); |
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232 |
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233 os << "endwhile"; |
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234 } |
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235 |
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578
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236 // For. |
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237 |
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238 tree_for_command::~tree_for_command (void) |
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239 { |
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240 delete id; |
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241 delete id_list; |
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494
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242 delete expr; |
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243 delete list; |
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244 } |
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245 |
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246 inline void |
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1228
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247 tree_for_command::do_for_loop_once (tree_return_list *lst, |
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248 const Octave_object& rhs, int& quit) |
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249 { |
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250 quit = 0; |
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251 |
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252 tree_oct_obj *tmp = new tree_oct_obj (rhs); |
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253 tree_multi_assignment_expression tmp_ass (lst, tmp, 1); |
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254 tmp_ass.eval (0); |
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255 |
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256 if (error_state) |
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257 { |
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258 eval_error (); |
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259 return; |
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260 } |
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261 |
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262 if (list) |
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263 { |
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264 list->eval (1); |
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265 if (error_state) |
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266 { |
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267 eval_error (); |
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268 quit = 1; |
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269 return; |
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270 } |
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271 } |
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272 |
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273 quit = quit_loop_now (); |
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274 } |
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275 |
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276 inline void |
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277 tree_for_command::do_for_loop_once (tree_index_expression *idx_expr, |
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278 const tree_constant& rhs, int& quit) |
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1168
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279 { |
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280 quit = 0; |
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281 |
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282 tree_constant *tmp = new tree_constant (rhs); |
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1228
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283 tree_simple_assignment_expression tmp_ass (idx_expr, tmp, 1); |
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1168
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284 tmp_ass.eval (0); |
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285 |
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286 if (error_state) |
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287 { |
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288 eval_error (); |
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289 return; |
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290 } |
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291 |
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292 if (list) |
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293 { |
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294 list->eval (1); |
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295 if (error_state) |
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296 { |
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297 eval_error (); |
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298 quit = 1; |
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299 return; |
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300 } |
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301 } |
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302 |
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303 quit = quit_loop_now (); |
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304 } |
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305 |
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306 inline void |
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307 tree_for_command::do_for_loop_once (tree_identifier *ident, |
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308 tree_constant& rhs, int& quit) |
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309 { |
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310 quit = 0; |
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311 |
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312 ident->assign (rhs); |
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313 |
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314 if (error_state) |
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315 { |
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316 eval_error (); |
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317 return; |
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318 } |
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319 |
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320 if (list) |
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321 { |
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322 list->eval (1); |
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323 if (error_state) |
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324 { |
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325 eval_error (); |
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326 quit = 1; |
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327 return; |
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328 } |
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329 } |
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330 |
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331 quit = quit_loop_now (); |
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332 } |
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333 |
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334 #define DO_LOOP(val) \ |
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335 do \ |
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336 { \ |
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337 if (ident) \ |
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338 for (int i = 0; i < steps; i++) \ |
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339 { \ |
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340 tree_constant rhs (val); \ |
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341 int quit = 0; \ |
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342 do_for_loop_once (ident, rhs, quit); \ |
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343 if (quit) \ |
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344 break; \ |
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345 } \ |
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1228
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346 else if (id_list) \ |
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347 for (int i = 0; i < steps; i++) \ |
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348 { \ |
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349 Octave_object rhs (val); \ |
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350 int quit = 0; \ |
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351 do_for_loop_once (id_list, rhs, quit); \ |
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352 if (quit) \ |
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353 break; \ |
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354 } \ |
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1168
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355 else \ |
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356 for (int i = 0; i < steps; i++) \ |
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357 { \ |
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358 tree_constant rhs (val); \ |
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359 int quit = 0; \ |
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1228
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360 do_for_loop_once (tmp_id, rhs, quit); \ |
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1168
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361 if (quit) \ |
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362 break; \ |
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363 } \ |
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364 } \ |
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365 while (0) |
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366 |
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578
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367 void |
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368 tree_for_command::eval (void) |
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494
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369 { |
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529
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370 if (error_state || ! expr) |
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578
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371 return; |
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494
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372 |
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373 tree_constant tmp_expr = expr->eval (0); |
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374 |
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375 if (error_state || tmp_expr.is_undefined ()) |
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376 { |
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377 eval_error (); |
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578
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378 return; |
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494
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379 } |
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380 |
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1228
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381 tree_index_expression *tmp_id = id; |
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382 if (id_list && id_list->length () == 1) |
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383 tmp_id = id_list->front (); |
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384 |
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1168
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385 tree_identifier *ident = 0; |
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1228
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386 if (tmp_id && ! tmp_id->arg_list ()) |
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1168
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387 { |
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1228
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388 tree_indirect_ref *idr = tmp_id->ident (); |
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1168
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389 if (idr->is_identifier_only ()) |
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390 ident = idr->ident (); |
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391 } |
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392 |
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1234
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393 if (id_list && ! ident && ! tmp_expr.is_map ()) |
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1228
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394 { |
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395 error ("in statement `for [X, Y] = VAL', VAL must be a structure"); |
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396 return; |
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397 } |
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398 |
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620
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399 if (tmp_expr.is_scalar_type ()) |
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400 { |
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401 int quit = 0; |
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1168
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402 if (ident) |
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403 do_for_loop_once (ident, tmp_expr, quit); |
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1228
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404 else if (id_list) |
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405 { |
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406 Octave_object rhs (tmp_expr); |
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407 do_for_loop_once (id_list, rhs, quit); |
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408 } |
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1168
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409 else |
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1228
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410 do_for_loop_once (tmp_id, tmp_expr, quit); |
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620
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411 } |
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412 else if (tmp_expr.is_matrix_type ()) |
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494
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413 { |
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620
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414 Matrix m_tmp; |
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415 ComplexMatrix cm_tmp; |
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416 int nr; |
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417 int steps; |
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418 if (tmp_expr.is_real_matrix ()) |
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419 { |
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420 m_tmp = tmp_expr.matrix_value (); |
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421 nr = m_tmp.rows (); |
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422 steps = m_tmp.columns (); |
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423 } |
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424 else |
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425 { |
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426 cm_tmp = tmp_expr.complex_matrix_value (); |
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427 nr = cm_tmp.rows (); |
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428 steps = cm_tmp.columns (); |
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429 } |
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494
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430 |
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1168
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431 if (tmp_expr.is_real_matrix ()) |
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620
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432 { |
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433 if (nr == 1) |
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1168
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434 DO_LOOP(m_tmp (0, i)); |
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620
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435 else |
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1168
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436 DO_LOOP(m_tmp.extract (0, i, nr-1, i)); |
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437 } |
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438 else |
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439 { |
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440 if (nr == 1) |
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441 DO_LOOP(cm_tmp (0, i)); |
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442 else |
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443 DO_LOOP(cm_tmp.extract (0, i, nr-1, i)); |
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620
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444 } |
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445 } |
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446 else if (tmp_expr.is_string ()) |
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447 { |
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494
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448 gripe_string_invalid (); |
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620
|
449 } |
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450 else if (tmp_expr.is_range ()) |
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|
451 { |
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452 Range rng = tmp_expr.range_value (); |
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494
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453 |
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620
|
454 int steps = rng.nelem (); |
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455 double b = rng.base (); |
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456 double increment = rng.inc (); |
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494
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457 |
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1168
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458 if (ident) |
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620
|
459 { |
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1168
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460 for (int i = 0; i < steps; i++) |
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461 { |
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462 double tmp_val = b + i * increment; |
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463 |
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464 tree_constant rhs (tmp_val); |
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465 |
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466 int quit = 0; |
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|
467 do_for_loop_once (ident, rhs, quit); |
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494
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468 |
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1168
|
469 if (quit) |
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470 break; |
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471 } |
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472 } |
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1228
|
473 else if (id_list) |
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474 { |
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|
475 for (int i = 0; i < steps; i++) |
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476 { |
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477 double tmp_val = b + i * increment; |
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478 |
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479 Octave_object rhs (tmp_val); |
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480 |
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481 int quit = 0; |
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|
482 do_for_loop_once (id_list, rhs, quit); |
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483 |
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484 if (quit) |
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|
485 break; |
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486 } |
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487 } |
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1168
|
488 else |
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489 { |
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|
490 for (int i = 0; i < steps; i++) |
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491 { |
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|
492 double tmp_val = b + i * increment; |
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494
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493 |
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1168
|
494 tree_constant rhs (tmp_val); |
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|
495 |
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|
496 int quit = 0; |
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1228
|
497 do_for_loop_once (tmp_id, rhs, quit); |
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|
498 |
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|
499 if (quit) |
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|
500 break; |
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501 } |
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502 } |
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503 } |
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|
504 else if (tmp_expr.is_map ()) |
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505 { |
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|
506 if (ident) |
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|
507 { |
|
|
508 Octave_map tmp_val (tmp_expr.map_value ()); |
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|
509 |
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|
510 for (Pix p = tmp_val.first (); p != 0; tmp_val.next (p)) |
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|
511 { |
|
|
512 tree_constant rhs (tmp_val.contents (p)); |
|
|
513 |
|
|
514 int quit; |
|
|
515 do_for_loop_once (ident, rhs, quit); |
|
|
516 |
|
|
517 if (quit) |
|
|
518 break; |
|
|
519 } |
|
|
520 } |
|
|
521 else if (id_list) |
|
|
522 { |
|
|
523 // Cycle through structure elements. First element of |
|
|
524 // id_list is set to value and the second is set to the name |
|
|
525 // of the structure element. |
|
|
526 |
|
|
527 Octave_map tmp_val (tmp_expr.map_value ()); |
|
|
528 |
|
|
529 for (Pix p = tmp_val.first (); p != 0; tmp_val.next (p)) |
|
|
530 { |
|
|
531 Octave_object tmp; |
|
|
532 tmp (1) = tmp_val.key (p); |
|
|
533 tmp (0) = tmp_val.contents (p); |
|
|
534 |
|
|
535 int quit; |
|
|
536 do_for_loop_once (id_list, tmp, quit); |
|
|
537 |
|
|
538 if (quit) |
|
|
539 break; |
|
|
540 } |
|
|
541 } |
|
|
542 else |
|
|
543 { |
|
|
544 Octave_map tmp_val (tmp_expr.map_value ()); |
|
|
545 |
|
|
546 for (Pix p = tmp_val.first (); p != 0; tmp_val.next (p)) |
|
|
547 { |
|
|
548 tree_constant rhs = tmp_val.contents (p); |
|
|
549 |
|
|
550 int quit; |
|
|
551 do_for_loop_once (tmp_id, rhs, quit); |
|
1168
|
552 |
|
|
553 if (quit) |
|
|
554 break; |
|
|
555 } |
|
620
|
556 } |
|
|
557 } |
|
|
558 else |
|
|
559 { |
|
|
560 ::error ("invalid type in for loop expression near line %d, column %d", |
|
|
561 line (), column ()); |
|
494
|
562 } |
|
|
563 } |
|
|
564 |
|
|
565 void |
|
|
566 tree_for_command::eval_error (void) |
|
|
567 { |
|
|
568 if (error_state > 0) |
|
|
569 ::error ("evaluating for command near line %d, column %d", |
|
|
570 line (), column ()); |
|
|
571 } |
|
|
572 |
|
578
|
573 void |
|
581
|
574 tree_for_command::print_code (ostream& os) |
|
|
575 { |
|
|
576 print_code_indent (os); |
|
|
577 |
|
|
578 os << "for "; |
|
|
579 |
|
|
580 if (id) |
|
|
581 id->print_code (os); |
|
|
582 |
|
|
583 os << " = "; |
|
|
584 |
|
|
585 if (expr) |
|
|
586 expr->print_code (os); |
|
|
587 |
|
|
588 print_code_new_line (os); |
|
|
589 |
|
|
590 if (list) |
|
|
591 { |
|
|
592 increment_indent_level (); |
|
|
593 list->print_code (os); |
|
|
594 decrement_indent_level (); |
|
|
595 } |
|
|
596 |
|
|
597 print_code_indent (os); |
|
|
598 |
|
|
599 os << "endfor"; |
|
|
600 } |
|
|
601 |
|
578
|
602 // If. |
|
494
|
603 |
|
|
604 tree_if_command::~tree_if_command (void) |
|
|
605 { |
|
|
606 delete list; |
|
|
607 } |
|
|
608 |
|
|
609 void |
|
578
|
610 tree_if_command::eval (void) |
|
494
|
611 { |
|
578
|
612 if (list) |
|
|
613 list->eval (); |
|
|
614 |
|
494
|
615 if (error_state > 0) |
|
|
616 ::error ("evaluating if command near line %d, column %d", |
|
|
617 line (), column ()); |
|
|
618 } |
|
|
619 |
|
581
|
620 void |
|
|
621 tree_if_command::print_code (ostream& os) |
|
|
622 { |
|
|
623 print_code_indent (os); |
|
|
624 |
|
|
625 os << "if "; |
|
|
626 |
|
|
627 if (list) |
|
|
628 list->print_code (os); |
|
|
629 |
|
|
630 print_code_indent (os); |
|
|
631 |
|
|
632 os << "endif"; |
|
|
633 } |
|
|
634 |
|
916
|
635 // Simple exception handling. |
|
|
636 |
|
|
637 tree_unwind_protect_command::~tree_unwind_protect_command (void) |
|
|
638 { |
|
|
639 delete unwind_protect_code; |
|
|
640 delete cleanup_code; |
|
|
641 } |
|
|
642 |
|
|
643 static void |
|
|
644 do_unwind_protect_cleanup_code (void *ptr) |
|
|
645 { |
|
|
646 tree_statement_list *list = (tree_statement_list *) ptr; |
|
|
647 |
|
1228
|
648 // We want to run the cleanup code without error_state being set, |
|
|
649 // but we need to restore its value, so that any errors encountered |
|
|
650 // in the first part of the unwind_protect are not completely |
|
|
651 // ignored. |
|
916
|
652 |
|
|
653 unwind_protect_int (error_state); |
|
1266
|
654 error_state = 0; |
|
916
|
655 |
|
1266
|
656 // Similarly, if we have seen a return or break statement, allow all |
|
|
657 // the cleanup code to run before returning or handling the break. |
|
|
658 // We don't have to worry about continue statements because they can |
|
|
659 // only occur in loops. |
|
|
660 |
|
|
661 unwind_protect_int (returning); |
|
|
662 returning = 0; |
|
|
663 |
|
|
664 unwind_protect_int (breaking); |
|
|
665 breaking = 0; |
|
916
|
666 |
|
|
667 if (list) |
|
|
668 list->eval (1); |
|
|
669 |
|
1266
|
670 // This is the one for breaking. (The unwind_protects are popped |
|
|
671 // off the stack in the reverse of the order they are pushed on). |
|
|
672 |
|
|
673 // XXX FIXME XXX -- inside an unwind_protect, should break work like |
|
|
674 // a return, or just jump to the end of the unwind_protect block? |
|
|
675 // The following code makes it just jump to the end of the block. |
|
|
676 |
|
|
677 run_unwind_protect (); |
|
|
678 if (breaking) |
|
|
679 breaking--; |
|
|
680 |
|
|
681 // This is the one for returning. |
|
|
682 |
|
|
683 if (returning) |
|
|
684 discard_unwind_protect (); |
|
|
685 else |
|
|
686 run_unwind_protect (); |
|
|
687 |
|
1228
|
688 // We don't want to ignore errors that occur in the cleanup code, so |
|
|
689 // if an error is encountered there, leave error_state alone. |
|
|
690 // Otherwise, set it back to what it was before. |
|
916
|
691 |
|
|
692 if (error_state) |
|
|
693 discard_unwind_protect (); |
|
|
694 else |
|
|
695 run_unwind_protect (); |
|
|
696 } |
|
|
697 |
|
|
698 void |
|
|
699 tree_unwind_protect_command::eval (void) |
|
|
700 { |
|
|
701 add_unwind_protect (do_unwind_protect_cleanup_code, cleanup_code); |
|
|
702 |
|
|
703 if (unwind_protect_code) |
|
|
704 unwind_protect_code->eval (1); |
|
|
705 |
|
|
706 run_unwind_protect (); |
|
|
707 } |
|
|
708 |
|
|
709 void |
|
|
710 tree_unwind_protect_command::print_code (ostream& os) |
|
|
711 { |
|
|
712 print_code_indent (os); |
|
|
713 |
|
|
714 os << "unwind_protect"; |
|
|
715 |
|
|
716 print_code_new_line (os); |
|
|
717 |
|
|
718 if (unwind_protect_code) |
|
|
719 { |
|
|
720 increment_indent_level (); |
|
|
721 unwind_protect_code->print_code (os); |
|
|
722 decrement_indent_level (); |
|
|
723 } |
|
|
724 |
|
|
725 print_code_indent (os); |
|
|
726 |
|
|
727 os << "cleanup_code"; |
|
|
728 |
|
|
729 print_code_new_line (os); |
|
|
730 |
|
|
731 if (cleanup_code) |
|
|
732 { |
|
|
733 increment_indent_level (); |
|
|
734 cleanup_code->print_code (os); |
|
|
735 decrement_indent_level (); |
|
|
736 } |
|
|
737 |
|
|
738 print_code_indent (os); |
|
|
739 |
|
|
740 os << "end_unwind_protect"; |
|
|
741 } |
|
|
742 |
|
578
|
743 // Break. |
|
494
|
744 |
|
578
|
745 void |
|
|
746 tree_break_command::eval (void) |
|
494
|
747 { |
|
|
748 if (! error_state) |
|
|
749 breaking = 1; |
|
|
750 } |
|
|
751 |
|
581
|
752 void |
|
|
753 tree_break_command::print_code (ostream& os) |
|
|
754 { |
|
|
755 print_code_indent (os); |
|
|
756 |
|
|
757 os << "break"; |
|
|
758 } |
|
|
759 |
|
578
|
760 // Continue. |
|
494
|
761 |
|
578
|
762 void |
|
|
763 tree_continue_command::eval (void) |
|
494
|
764 { |
|
|
765 if (! error_state) |
|
|
766 continuing = 1; |
|
|
767 } |
|
|
768 |
|
581
|
769 void |
|
|
770 tree_continue_command::print_code (ostream& os) |
|
|
771 { |
|
|
772 print_code_indent (os); |
|
|
773 |
|
|
774 os << "continue"; |
|
|
775 } |
|
|
776 |
|
578
|
777 // Return. |
|
494
|
778 |
|
578
|
779 void |
|
|
780 tree_return_command::eval (void) |
|
494
|
781 { |
|
|
782 if (! error_state) |
|
|
783 returning = 1; |
|
|
784 } |
|
|
785 |
|
581
|
786 void |
|
|
787 tree_return_command::print_code (ostream& os) |
|
|
788 { |
|
|
789 print_code_indent (os); |
|
|
790 |
|
|
791 os << "return"; |
|
|
792 } |
|
|
793 |
|
494
|
794 /* |
|
|
795 ;;; Local Variables: *** |
|
|
796 ;;; mode: C++ *** |
|
|
797 ;;; page-delimiter: "^/\\*" *** |
|
|
798 ;;; End: *** |
|
|
799 */ |
