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1 /* |
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2 * (c) 2007 Mario de Sousa and Laurent Bessard |
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3 * |
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4 * Offered to the public under the terms of the GNU General Public License |
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5 * as published by the Free Software Foundation; either version 2 of the |
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6 * License, or (at your option) any later version. |
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7 * |
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8 * This program is distributed in the hope that it will be useful, but |
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9 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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11 * Public License for more details. |
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12 * |
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13 * This code is made available on the understanding that it will not be |
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14 * used in safety-critical situations without a full and competent review. |
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15 */ |
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16 |
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17 /* |
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18 * An IEC 61131-3 IL and ST compiler. |
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19 * |
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20 * Based on the |
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21 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) |
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22 * |
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23 */ |
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24 |
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25 /* |
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26 * This is one of the versions available for the 4th stage. |
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27 * |
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28 * This 4th stage generates a c++ source program equivalent |
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29 * to the IL and ST code. |
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30 */ |
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31 |
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32 //#include <stdio.h> /* required for NULL */ |
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33 //#include <string> |
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34 //#include <iostream> |
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35 |
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36 //#include "../../util/symtable.hh" |
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37 |
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38 |
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39 |
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40 |
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41 |
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42 |
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43 |
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44 |
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45 |
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46 /***********************************************************************/ |
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47 /***********************************************************************/ |
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48 /***********************************************************************/ |
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49 /***********************************************************************/ |
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50 /***********************************************************************/ |
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51 /***********************************************************************/ |
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52 /***********************************************************************/ |
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53 /***********************************************************************/ |
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54 |
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55 class generate_location_list_c: protected iterator_visitor_c { |
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56 |
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57 protected: |
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58 stage4out_c &s4o; |
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59 |
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60 private: |
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61 symbol_c *current_var_type_symbol; |
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62 generate_c_base_c *generate_c_base; |
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63 search_base_type_c search_base_type; |
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64 |
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65 public: |
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66 generate_location_list_c(stage4out_c *s4o_ptr): s4o(*s4o_ptr) { |
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67 generate_c_base = new generate_c_base_c(s4o_ptr); |
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68 current_var_type_symbol = NULL; |
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69 } |
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70 ~generate_location_list_c(void) { |
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71 delete generate_c_base; |
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72 } |
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73 |
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74 bool test_location_type(symbol_c *direct_variable) { |
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75 |
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76 token_c *location = dynamic_cast<token_c *>(direct_variable); |
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77 |
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78 if (location == NULL) |
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79 /* invalid identifiers... */ |
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80 return false; |
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81 |
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82 switch (location->value[2]) { |
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83 case 'X': // bit |
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84 if (typeid(*current_var_type_symbol) == typeid(bool_type_name_c)) return true; |
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85 break; |
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86 case 'B': // Byte, 8 bits |
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87 if (typeid(*current_var_type_symbol) == typeid(sint_type_name_c)) return true; |
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88 if (typeid(*current_var_type_symbol) == typeid(usint_type_name_c)) return true; |
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89 if (typeid(*current_var_type_symbol) == typeid(string_type_name_c)) return true; |
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90 if (typeid(*current_var_type_symbol) == typeid(byte_type_name_c)) return true; |
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91 break; |
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92 case 'W': // Word, 16 bits |
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93 if (typeid(*current_var_type_symbol) == typeid(int_type_name_c)) return true; |
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94 if (typeid(*current_var_type_symbol) == typeid(uint_type_name_c)) return true; |
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95 if (typeid(*current_var_type_symbol) == typeid(word_type_name_c)) return true; |
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96 if (typeid(*current_var_type_symbol) == typeid(wstring_type_name_c)) return true; |
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97 break; |
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98 case 'D': // Double, 32 bits |
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99 if (typeid(*current_var_type_symbol) == typeid(dint_type_name_c)) return true; |
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100 if (typeid(*current_var_type_symbol) == typeid(udint_type_name_c)) return true; |
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101 if (typeid(*current_var_type_symbol) == typeid(real_type_name_c)) return true; |
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102 if (typeid(*current_var_type_symbol) == typeid(dword_type_name_c)) return true; |
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103 break; |
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104 case 'L': // Long, 64 bits |
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105 if (typeid(*current_var_type_symbol) == typeid(lint_type_name_c)) return true; |
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106 if (typeid(*current_var_type_symbol) == typeid(ulint_type_name_c)) return true; |
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107 if (typeid(*current_var_type_symbol) == typeid(lreal_type_name_c)) return true; |
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108 if (typeid(*current_var_type_symbol) == typeid(lword_type_name_c)) return true; |
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109 break; |
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110 default: |
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111 if (typeid(*current_var_type_symbol) == typeid(bool_type_name_c)) return true; |
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112 } |
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113 return false; |
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114 } |
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115 |
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116 /********************************************/ |
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117 /* B.1.4.1 Directly Represented Variables */ |
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118 /********************************************/ |
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119 |
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120 void *visit(direct_variable_c *symbol) { |
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121 if (current_var_type_symbol) { |
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122 s4o.print("__LOCATED_VAR("); |
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123 current_var_type_symbol->accept(*generate_c_base); |
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124 s4o.print(","); |
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125 /* Do not use print_token() as it will change everything into uppercase */ |
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126 s4o.printlocation((symbol->value)+1); |
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127 s4o.print(","); |
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128 s4o.printlocation_comasep((symbol->value)+1); |
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129 s4o.print(")\n"); |
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130 } |
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131 return NULL; |
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132 } |
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133 |
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134 |
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135 /********************************************/ |
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136 /* B.1.4.3 Declaration and initilization */ |
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137 /********************************************/ |
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138 |
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139 /* [variable_name] location ':' located_var_spec_init */ |
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140 /* variable_name -> may be NULL ! */ |
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141 //SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused) |
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142 void *visit(located_var_decl_c *symbol) { |
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143 current_var_type_symbol = spec_init_sperator_c::get_spec(symbol->located_var_spec_init); |
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144 if (current_var_type_symbol == NULL) |
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145 ERROR; |
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146 |
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147 current_var_type_symbol = (symbol_c *)(current_var_type_symbol->accept(search_base_type)); |
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148 if (current_var_type_symbol == NULL) |
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149 ERROR; |
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150 |
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151 symbol->location->accept(*this); |
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152 |
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153 current_var_type_symbol = NULL; |
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154 return NULL; |
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155 } |
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156 |
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157 /*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */ |
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158 /* type_specification ->may be NULL ! */ |
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159 //SYM_REF2(global_var_decl_c, global_var_spec, type_specification) |
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160 void *visit(global_var_decl_c *symbol) { |
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161 current_var_type_symbol = spec_init_sperator_c::get_spec(symbol->type_specification); |
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162 if (current_var_type_symbol == NULL) |
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163 ERROR; |
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164 |
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165 current_var_type_symbol = (symbol_c *)(current_var_type_symbol->accept(search_base_type)); |
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166 if (current_var_type_symbol == NULL) |
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167 ERROR; |
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168 |
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169 symbol->global_var_spec->accept(*this); |
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170 |
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171 current_var_type_symbol = NULL; |
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172 return NULL; |
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173 } |
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174 |
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175 /* AT direct_variable */ |
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176 //SYM_REF2(location_c, direct_variable, unused) |
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177 void *visit(location_c *symbol) { |
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178 if (test_location_type(symbol->direct_variable)) |
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179 symbol->direct_variable->accept(*this); |
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180 else |
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181 ERROR; |
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182 return NULL; |
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183 } |
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184 |
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185 }; /* generate_location_list_c */ |