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1 /* |
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2 * (c) 2009 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 size, in bits, of the data type. |
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27 * |
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28 * NOTE: Currently, only elementary data types with well defined sizes (in the standard) are supported. |
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29 * - derived data types are not supported, and these will return 0 |
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30 * - TIME, DATE, TIME_OF_DAY, and DATE_AND_TIME are not supported, and will return 0 |
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31 * - STRING and WSTRING are not supported, and the standard merely defines bit per character, |
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32 * and not the maximum number of characters, so these will return 0 |
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33 * |
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34 * We also support the 'Numeric Literals' Data types. |
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35 * i.e., numeric literals are considerd basic data types |
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36 * as their data type is undefined (e.g. the datat type of '30' |
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37 * could be 'INT' or 'SINT' or 'LINT' or 'USINT' or ... |
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38 * |
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39 * For numeric literals, we return the minimum number of bits |
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40 * required to store the value. |
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41 * |
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42 * E.g. TYPE new_int_t : INT; END_TYPE; |
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43 * TYPE new_int2_t : INT = 2; END_TYPE; |
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44 * TYPE new_subr_t : INT (4..5); END_TYPE; |
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45 * |
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46 * sizeof(SINT) -> 8 |
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47 * sizeof(INT) -> 16 |
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48 * sizeof(DINT) -> 32 |
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49 * sizeof(LINT) -> 64 |
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50 * |
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51 * sizeof('1') -> 1 |
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52 * sizeof('015') -> 4 # Leading zeros are ignored! |
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53 * sizeof('0') -> 1 # This is a special case! Even the value 0 needs at least 1 bit to store! |
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54 * sizeof('16') -> 5 |
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55 * sizeof('2#00101') -> 3 |
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56 * sizeof('8#334') -> 9 |
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57 * sizeof('16#2A') -> 8 |
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58 * |
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59 * sizeof('7.4') -> 32 # all real literals return 32 bits, the size of a 'REAL' |
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60 * # TODO: study IEC 60559 for the range of values that may be |
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61 * # stored in a REAL (basic single width floating point format) |
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62 * # and in a LREAL (basic double width floating point format) |
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63 * # and see if some real literals need to return 64 instead! |
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64 */ |
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65 |
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66 #include "../absyntax/visitor.hh" |
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67 |
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68 class get_sizeof_datatype_c: public null_visitor_c { |
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69 |
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70 public: |
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71 static int getsize(symbol_c *data_type_symbol); |
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72 ~get_sizeof_datatype_c(void); |
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73 |
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74 private: |
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75 /* this class is a singleton. So we need a pointer to the single instance... */ |
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76 static get_sizeof_datatype_c *singleton; |
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77 |
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78 private: |
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79 /*********************/ |
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80 /* B 1.2 - Constants */ |
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81 /*********************/ |
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82 |
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83 /******************************/ |
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84 /* B 1.2.1 - Numeric Literals */ |
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85 /******************************/ |
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86 /* Numeric literals without any explicit type cast have unknown data type, |
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87 * so we continue considering them as their own basic data types until |
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88 * they can be resolved (for example, when using '30+x' where 'x' is a LINT variable, the |
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89 * numeric literal '30' must then be considered a LINT so the ADD function may be called |
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90 * with all inputs of the same data type. |
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91 * If 'x' were a SINT, then the '30' would have to be a SINT too! |
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92 */ |
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93 void *visit(real_c *symbol); |
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94 void *visit(integer_c *symbol); |
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95 void *visit(binary_integer_c *symbol); |
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96 void *visit(octal_integer_c *symbol); |
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97 void *visit(hex_integer_c *symbol); |
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98 |
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99 /***********************************/ |
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100 /* B 1.3.1 - Elementary Data Types */ |
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101 /***********************************/ |
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102 // void *visit(time_type_name_c *symbol); |
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103 void *visit(bool_type_name_c *symbol); |
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104 void *visit(sint_type_name_c *symbol); |
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105 void *visit(int_type_name_c *symbol); |
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106 void *visit(dint_type_name_c *symbol); |
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107 void *visit(lint_type_name_c *symbol); |
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108 void *visit(usint_type_name_c *symbol); |
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109 void *visit(uint_type_name_c *symbol); |
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110 void *visit(udint_type_name_c *symbol); |
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111 void *visit(ulint_type_name_c *symbol); |
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112 void *visit(real_type_name_c *symbol); |
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113 void *visit(lreal_type_name_c *symbol); |
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114 // void *visit(date_type_name_c *symbol); |
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115 // void *visit(tod_type_name_c *symbol); |
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116 // void *visit(dt_type_name_c *symbol) ; |
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117 void *visit(byte_type_name_c *symbol); |
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118 void *visit(word_type_name_c *symbol); |
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119 void *visit(dword_type_name_c *symbol); |
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120 void *visit(lword_type_name_c *symbol); |
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121 // void *visit(string_type_name_c *symbol); |
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122 // void *visit(wstring_type_name_c *symbol); |
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123 |
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124 /******************************************************/ |
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125 /* Extensions to the base standard as defined in */ |
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126 /* "Safety Software Technical Specification, */ |
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127 /* Part 1: Concepts and Function Blocks, */ |
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128 /* Version 1.0 – Official Release" */ |
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129 /* by PLCopen - Technical Committee 5 - 2006-01-31 */ |
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130 /******************************************************/ |
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131 void *visit(safebool_type_name_c *symbol); |
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132 |
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133 /********************************/ |
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134 /* B 1.3.3 - Derived data types */ |
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135 /********************************/ |
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136 #if 0 |
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137 /* simple_type_name ':' simple_spec_init */ |
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138 void *visit(simple_type_declaration_c *symbol); |
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139 /* simple_specification ASSIGN constant */ |
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140 void *visit(simple_spec_init_c *symbol); |
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141 /* subrange_type_name ':' subrange_spec_init */ |
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142 void *visit(subrange_type_declaration_c *symbol); |
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143 /* subrange_specification ASSIGN signed_integer */ |
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144 void *visit(subrange_spec_init_c *symbol); |
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145 /* integer_type_name '(' subrange')' */ |
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146 void *visit(subrange_specification_c *symbol); |
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147 /* signed_integer DOTDOT signed_integer */ |
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148 void *visit(subrange_c *symbol); |
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149 |
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150 /* enumerated_type_name ':' enumerated_spec_init */ |
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151 void *visit(enumerated_type_declaration_c *symbol); |
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152 /* enumerated_specification ASSIGN enumerated_value */ |
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153 void *visit(enumerated_spec_init_c *symbol); |
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154 /* helper symbol for enumerated_specification->enumerated_spec_init */ |
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155 /* enumerated_value_list ',' enumerated_value */ |
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156 void *visit(enumerated_value_list_c *symbol); |
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157 /* enumerated_type_name '#' identifier */ |
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158 // SYM_REF2(enumerated_value_c, type, value) |
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159 void *visit(enumerated_value_c *symbol); |
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160 /* identifier ':' array_spec_init */ |
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161 void *visit(array_type_declaration_c *symbol); |
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162 /* array_specification [ASSIGN array_initialization} */ |
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163 /* array_initialization may be NULL ! */ |
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164 void *visit(array_spec_init_c *symbol); |
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165 /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */ |
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166 void *visit(array_specification_c *symbol); |
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167 /* helper symbol for array_specification */ |
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168 /* array_subrange_list ',' subrange */ |
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169 void *visit(array_subrange_list_c *symbol); |
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170 /* array_initialization: '[' array_initial_elements_list ']' */ |
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171 /* helper symbol for array_initialization */ |
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172 /* array_initial_elements_list ',' array_initial_elements */ |
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173 void *visit(array_initial_elements_list_c *symbol); |
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174 /* integer '(' [array_initial_element] ')' */ |
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175 /* array_initial_element may be NULL ! */ |
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176 void *visit(array_initial_elements_c *symbol); |
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177 /* structure_type_name ':' structure_specification */ |
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178 /* NOTE: structure_specification will point to either a |
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179 * initialized_structure_c |
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180 * OR A |
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181 * structure_element_declaration_list_c |
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182 */ |
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183 void *visit(structure_type_declaration_c *symbol); |
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184 /* structure_type_name ASSIGN structure_initialization */ |
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185 /* structure_initialization may be NULL ! */ |
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186 void *visit(initialized_structure_c *symbol); |
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187 /* helper symbol for structure_declaration */ |
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188 /* structure_declaration: STRUCT structure_element_declaration_list END_STRUCT */ |
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189 /* structure_element_declaration_list structure_element_declaration ';' */ |
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190 void *visit(structure_element_declaration_list_c *symbol); |
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191 /* structure_element_name ':' *_spec_init */ |
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192 void *visit(structure_element_declaration_c *symbol); |
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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); |
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197 /* structure_element_name ASSIGN value */ |
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198 void *visit(structure_element_initialization_c *symbol); |
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199 /* string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */ |
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200 /* |
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201 SYM_REF4(string_type_declaration_c, string_type_name, |
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202 elementary_string_type_name, |
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203 string_type_declaration_size, |
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204 string_type_declaration_init) // may be == NULL! |
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205 */ |
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206 void *visit(string_type_declaration_c *symbol); |
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207 #endif |
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208 }; // get_sizeof_datatype_c |
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209 |
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210 |
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211 |
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212 |