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1 /* |
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2 * (c) 2003 Mario de Sousa |
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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 /* Determine the data type on which another data type is based on. |
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27 * If a new default initial value is given, we DO NOT consider it a |
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28 * new base class, and continue looking further! |
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29 * |
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30 * E.g. TYPE new_int_t : INT; END_TYPE; |
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31 * TYPE new_int2_t : INT = 2; END_TYPE; |
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32 * TYPE new_subr_t : INT (4..5); END_TYPE; |
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33 * |
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34 * new_int_t is really an INT!! |
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35 * new_int2_t is also really an INT!! |
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36 * new_subr_t is also really an INT!! |
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37 */ |
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38 class search_base_type_c: public null_visitor_c { |
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39 private: |
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40 symbol_c *current_type_name; |
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41 |
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42 public: |
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43 search_base_type_c(void) {current_type_name = NULL;} |
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44 |
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45 public: |
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46 void *visit(identifier_c *type_name) { |
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47 this->current_type_name = type_name; |
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48 /* look up the type declaration... */ |
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49 symbol_c *type_decl = type_symtable.find_value(type_name); |
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50 if (type_decl == type_symtable.end_value()) |
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51 /* Type declaration not found!! */ |
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52 ERROR; |
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53 |
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54 return type_decl->accept(*this); |
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55 } |
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56 |
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57 /***********************************/ |
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58 /* B 1.3.1 - Elementary Data Types */ |
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59 /***********************************/ |
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60 void *visit(time_type_name_c *symbol) {return (void *)symbol;} |
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61 void *visit(bool_type_name_c *symbol) {return (void *)symbol;} |
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62 void *visit(sint_type_name_c *symbol) {return (void *)symbol;} |
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63 void *visit(int_type_name_c *symbol) {return (void *)symbol;} |
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64 void *visit(dint_type_name_c *symbol) {return (void *)symbol;} |
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65 void *visit(lint_type_name_c *symbol) {return (void *)symbol;} |
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66 void *visit(usint_type_name_c *symbol) {return (void *)symbol;} |
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67 void *visit(uint_type_name_c *symbol) {return (void *)symbol;} |
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68 void *visit(udint_type_name_c *symbol) {return (void *)symbol;} |
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69 void *visit(ulint_type_name_c *symbol) {return (void *)symbol;} |
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70 void *visit(real_type_name_c *symbol) {return (void *)symbol;} |
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71 void *visit(lreal_type_name_c *symbol) {return (void *)symbol;} |
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72 void *visit(date_type_name_c *symbol) {return (void *)symbol;} |
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73 void *visit(tod_type_name_c *symbol) {return (void *)symbol;} |
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74 void *visit(dt_type_name_c *symbol) {return (void *)symbol;} |
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75 void *visit(byte_type_name_c *symbol) {return (void *)symbol;} |
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76 void *visit(word_type_name_c *symbol) {return (void *)symbol;} |
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77 void *visit(dword_type_name_c *symbol) {return (void *)symbol;} |
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78 void *visit(lword_type_name_c *symbol) {return (void *)symbol;} |
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79 void *visit(string_type_name_c *symbol) {return (void *)symbol;} |
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80 void *visit(wstring_type_name_c *symbol) {return (void *)symbol;} |
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81 |
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82 /********************************/ |
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83 /* B 1.3.3 - Derived data types */ |
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84 /********************************/ |
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85 /* simple_type_name ':' simple_spec_init */ |
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86 void *visit(simple_type_declaration_c *symbol) { |
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87 return symbol->simple_spec_init->accept(*this); |
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88 } |
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89 /* simple_specification ASSIGN constant */ |
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90 void *visit(simple_spec_init_c *symbol) { |
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91 return symbol->simple_specification->accept(*this); |
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92 } |
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93 |
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94 /* subrange_type_name ':' subrange_spec_init */ |
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95 void *visit(subrange_type_declaration_c *symbol) { |
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96 return symbol->subrange_spec_init->accept(*this); |
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97 } |
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98 |
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99 /* subrange_specification ASSIGN signed_integer */ |
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100 void *visit(subrange_spec_init_c *symbol) { |
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101 return symbol->subrange_specification->accept(*this); |
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102 } |
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103 |
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104 /* integer_type_name '(' subrange')' */ |
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105 void *visit(subrange_specification_c *symbol) { |
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106 return symbol->integer_type_name->accept(*this); |
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107 } |
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108 |
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109 /* signed_integer DOTDOT signed_integer */ |
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110 void *visit(subrange_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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111 |
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112 /* enumerated_type_name ':' enumerated_spec_init */ |
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113 void *visit(enumerated_type_declaration_c *symbol) { |
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114 this->current_type_name = symbol->enumerated_type_name; |
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115 return symbol->enumerated_spec_init->accept(*this); |
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116 } |
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117 |
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118 /* enumerated_specification ASSIGN enumerated_value */ |
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119 void *visit(enumerated_spec_init_c *symbol) { |
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120 return symbol->enumerated_specification->accept(*this); |
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121 } |
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122 |
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123 /* helper symbol for enumerated_specification->enumerated_spec_init */ |
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124 /* enumerated_value_list ',' enumerated_value */ |
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125 void *visit(enumerated_value_list_c *symbol) { |
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126 if (NULL == this->current_type_name) ERROR; |
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127 return (void *)this->current_type_name; |
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128 } |
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129 |
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130 /* enumerated_type_name '#' identifier */ |
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131 // SYM_REF2(enumerated_value_c, type, value) |
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132 void *visit(enumerated_value_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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133 |
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134 /* identifier ':' array_spec_init */ |
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135 void *visit(array_type_declaration_c *symbol) { |
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136 this->current_type_name = symbol->identifier; |
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137 return symbol->array_spec_init->accept(*this); |
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138 } |
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139 |
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140 /* array_specification [ASSIGN array_initialization} */ |
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141 /* array_initialization may be NULL ! */ |
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142 void *visit(array_spec_init_c *symbol) { |
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143 return symbol->array_specification->accept(*this); |
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144 } |
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145 |
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146 /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */ |
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147 void *visit(array_specification_c *symbol) { |
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148 if (NULL == this->current_type_name) ERROR; |
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149 return (void *)this->current_type_name; |
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150 } |
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151 |
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152 /* helper symbol for array_specification */ |
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153 /* array_subrange_list ',' subrange */ |
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154 void *visit(array_subrange_list_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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155 |
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156 /* array_initialization: '[' array_initial_elements_list ']' */ |
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157 /* helper symbol for array_initialization */ |
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158 /* array_initial_elements_list ',' array_initial_elements */ |
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159 void *visit(array_initial_elements_list_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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160 |
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161 /* integer '(' [array_initial_element] ')' */ |
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162 /* array_initial_element may be NULL ! */ |
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163 void *visit(array_initial_elements_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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164 |
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165 /* structure_type_name ':' structure_specification */ |
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166 /* NOTE: structure_specification will point to either a |
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167 * initialized_structure_c |
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168 * OR A |
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169 * structure_element_declaration_list_c |
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170 */ |
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171 void *visit(structure_type_declaration_c *symbol) { |
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172 this->current_type_name = symbol->structure_type_name; |
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173 return symbol->structure_specification->accept(*this); |
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174 } |
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175 |
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176 /* structure_type_name ASSIGN structure_initialization */ |
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177 /* structure_initialization may be NULL ! */ |
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178 void *visit(initialized_structure_c *symbol) { |
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179 return symbol->structure_type_name->accept(*this); |
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180 } |
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181 |
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182 /* helper symbol for structure_declaration */ |
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183 /* structure_declaration: STRUCT structure_element_declaration_list END_STRUCT */ |
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184 /* structure_element_declaration_list structure_element_declaration ';' */ |
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185 void *visit(structure_element_declaration_list_c *symbol) { |
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186 if (NULL == this->current_type_name) ERROR; |
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187 return (void *)this->current_type_name; |
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188 } |
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189 |
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190 /* structure_element_name ':' *_spec_init */ |
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191 void *visit(structure_element_declaration_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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192 |
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193 /* helper symbol for structure_initialization */ |
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194 /* structure_initialization: '(' structure_element_initialization_list ')' */ |
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195 /* structure_element_initialization_list ',' structure_element_initialization */ |
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196 void *visit(structure_element_initialization_list_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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197 |
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198 /* structure_element_name ASSIGN value */ |
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199 void *visit(structure_element_initialization_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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200 |
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201 /* string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */ |
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202 /* |
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203 SYM_REF4(string_type_declaration_c, string_type_name, |
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204 elementary_string_type_name, |
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205 string_type_declaration_size, |
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206 string_type_declaration_init) // may be == NULL! |
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207 */ |
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208 void *visit(string_type_declaration_c *symbol) {return symbol;} |
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209 }; |
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210 |
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211 |
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212 |
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213 |