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1 /* |
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2 * matiec - a compiler for the programming languages defined in IEC 61131-3 |
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3 * |
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4 * Copyright (C) 2009-2012 Mario de Sousa (msousa@fe.up.pt) |
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5 * Copyright (C) 2012 Manuele Conti (conti.ma@alice.it) |
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6 * |
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7 * This program is free software: you can redistribute it and/or modify |
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8 * it under the terms of the GNU General Public License as published by |
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9 * the Free Software Foundation, either version 3 of the License, or |
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10 * (at your option) any later version. |
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11 * |
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12 * This program is distributed in the hope that it will be useful, |
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 * GNU General Public License for more details. |
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16 * |
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17 * You should have received a copy of the GNU General Public License |
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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19 * |
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20 * |
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21 * This code is made available on the understanding that it will not be |
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22 * used in safety-critical situations without a full and competent review. |
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23 */ |
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24 |
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25 /* |
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26 * An IEC 61131-3 compiler. |
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27 * |
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28 * Based on the |
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29 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) |
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30 * |
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31 */ |
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32 |
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33 /* Determine the data type of an constant expression. |
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34 * A reference to the relevant type definition is returned. |
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35 * |
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36 * For example: |
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37 * 2 + 3 -> returns reference |
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38 * 22.2 - 5 -> returns reference |
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39 * etc... |
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40 */ |
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41 |
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42 #include <vector> |
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43 #include "../absyntax_utils/absyntax_utils.hh" |
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44 |
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45 |
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46 |
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47 class constant_folding_c : public iterator_visitor_c { |
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48 private: |
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49 search_varfb_instance_type_c *search_varfb_instance_type; |
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50 search_base_type_c search_base_type; |
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51 int error_count; |
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52 bool warning_found; |
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53 int current_display_error_level; |
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54 /* Pointer to the previous IL instruction, which contains the current cvalue of the data stored in the IL stack, i.e. the default variable, a.k.a. accumulator */ |
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55 symbol_c *prev_il_instruction; |
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56 /* the current IL operand being analyzed */ |
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57 symbol_c *il_operand; |
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58 |
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59 public: |
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60 constant_folding_c(symbol_c *symbol = NULL); |
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61 virtual ~constant_folding_c(void); |
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62 int get_error_count(); |
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63 |
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64 private: |
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65 /*********************/ |
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66 /* B 1.2 - Constants */ |
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67 /*********************/ |
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68 /******************************/ |
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69 /* B 1.2.1 - Numeric Literals */ |
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70 /******************************/ |
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71 void *visit(real_c *symbol); |
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72 void *visit(integer_c *symbol); |
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73 void *visit(neg_real_c *symbol); |
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74 void *visit(neg_integer_c *symbol); |
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75 void *visit(binary_integer_c *symbol); |
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76 void *visit(octal_integer_c *symbol); |
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77 void *visit(hex_integer_c *symbol); |
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78 void *visit(integer_literal_c *symbol); |
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79 void *visit(real_literal_c *symbol); |
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80 void *visit(bit_string_literal_c *symbol); |
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81 void *visit(boolean_literal_c *symbol); |
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82 void *visit(boolean_true_c *symbol); |
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83 void *visit(boolean_false_c *symbol); |
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84 |
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85 /****************************************/ |
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86 /* B.2 - Language IL (Instruction List) */ |
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87 /****************************************/ |
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88 /***********************************/ |
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89 /* B 2.1 Instructions and Operands */ |
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90 /***********************************/ |
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91 // void *visit(instruction_list_c *symbol); /* Not needed, since we inherit from iterator_visitor_c */ |
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92 void *visit(il_instruction_c *symbol); |
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93 void *visit(il_simple_operation_c *symbol); |
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94 //void *visit(il_function_call_c *symbol); /* TODO */ |
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95 void *visit(il_expression_c *symbol); |
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96 void *visit(il_jump_operation_c *symbol); |
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97 void *visit(il_fb_call_c *symbol); |
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98 //void *visit(il_formal_funct_call_c *symbol); /* TODO */ |
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99 //void *visit(il_operand_list_c *symbol); /* Not needed, since we inherit from iterator_visitor_c */ |
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100 void *visit(simple_instr_list_c *symbol); |
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101 void *visit(il_simple_instruction_c *symbol); |
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102 |
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103 |
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104 /*******************/ |
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105 /* B 2.2 Operators */ |
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106 /*******************/ |
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107 void *visit( LD_operator_c *symbol); |
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108 void *visit( LDN_operator_c *symbol); |
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109 void *visit( ST_operator_c *symbol); |
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110 void *visit( STN_operator_c *symbol); |
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111 void *visit( NOT_operator_c *symbol); |
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112 void *visit( S_operator_c *symbol); |
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113 void *visit( R_operator_c *symbol); |
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114 void *visit( S1_operator_c *symbol); |
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115 void *visit( R1_operator_c *symbol); |
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116 void *visit( CLK_operator_c *symbol); |
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117 void *visit( CU_operator_c *symbol); |
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118 void *visit( CD_operator_c *symbol); |
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119 void *visit( PV_operator_c *symbol); |
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120 void *visit( IN_operator_c *symbol); |
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121 void *visit( PT_operator_c *symbol); |
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122 void *visit( AND_operator_c *symbol); |
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123 void *visit( OR_operator_c *symbol); |
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124 void *visit( XOR_operator_c *symbol); |
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125 void *visit( ANDN_operator_c *symbol); |
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126 void *visit( ORN_operator_c *symbol); |
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127 void *visit( XORN_operator_c *symbol); |
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128 void *visit( ADD_operator_c *symbol); |
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129 void *visit( SUB_operator_c *symbol); |
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130 void *visit( MUL_operator_c *symbol); |
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131 void *visit( DIV_operator_c *symbol); |
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132 void *visit( MOD_operator_c *symbol); |
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133 void *visit( GT_operator_c *symbol); |
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134 void *visit( GE_operator_c *symbol); |
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135 void *visit( EQ_operator_c *symbol); |
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136 void *visit( LT_operator_c *symbol); |
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137 void *visit( LE_operator_c *symbol); |
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138 void *visit( NE_operator_c *symbol); |
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139 void *visit( CAL_operator_c *symbol); |
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140 void *visit( CALC_operator_c *symbol); |
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141 void *visit(CALCN_operator_c *symbol); |
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142 void *visit( RET_operator_c *symbol); |
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143 void *visit( RETC_operator_c *symbol); |
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144 void *visit(RETCN_operator_c *symbol); |
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145 void *visit( JMP_operator_c *symbol); |
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146 void *visit( JMPC_operator_c *symbol); |
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147 void *visit(JMPCN_operator_c *symbol); |
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148 /* Symbol class handled together with function call checks */ |
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149 // void *visit(il_assign_operator_c *symbol, variable_name); |
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150 /* Symbol class handled together with function call checks */ |
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151 // void *visit(il_assign_operator_c *symbol, option, variable_name); |
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152 |
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153 /***************************************/ |
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154 /* B.3 - Language ST (Structured Text) */ |
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155 /***************************************/ |
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156 /***********************/ |
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157 /* B 3.1 - Expressions */ |
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158 /***********************/ |
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159 void *visit( or_expression_c *symbol); |
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160 void *visit( xor_expression_c *symbol); |
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161 void *visit( and_expression_c *symbol); |
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162 void *visit( equ_expression_c *symbol); |
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163 void *visit(notequ_expression_c *symbol); |
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164 void *visit( lt_expression_c *symbol); |
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165 void *visit( gt_expression_c *symbol); |
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166 void *visit( le_expression_c *symbol); |
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167 void *visit( ge_expression_c *symbol); |
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168 void *visit( add_expression_c *symbol); |
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169 void *visit( sub_expression_c *symbol); |
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170 void *visit( mul_expression_c *symbol); |
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171 void *visit( div_expression_c *symbol); |
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172 void *visit( mod_expression_c *symbol); |
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173 void *visit( power_expression_c *symbol); |
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174 void *visit( neg_expression_c *symbol); |
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175 void *visit( not_expression_c *symbol); |
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176 //void *visit(function_invocation_c *symbol); /* TODO */ |
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177 |
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178 }; |
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179 |