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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 /* |
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27 * Conversion of variable declaration constructs. |
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28 * |
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29 * This is part of the 4th stage that generates |
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30 * a c++ source program equivalent to the IL and ST |
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31 * code. |
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32 */ |
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33 |
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34 |
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35 |
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36 |
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37 //#include <stdio.h> /* required for NULL */ |
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38 //#include <string> |
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39 //#include <iostream> |
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40 |
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41 //#include "../../util/symtable.hh" |
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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 /***********************************************************************/ |
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56 /***********************************************************************/ |
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57 /***********************************************************************/ |
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58 /***********************************************************************/ |
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59 |
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60 |
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61 |
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62 |
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63 class generate_c_vardecl_c: protected generate_c_typedecl_c { |
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64 |
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65 /* A Helper class to the main class... */ |
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66 /* print a string, except the first time it is called */ |
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67 /* used to print the separator "," before each variable |
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68 * declaration, except the first... |
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69 * |
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70 * Needs to be done in a seperate class because this is called |
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71 * from within various locations within the code. |
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72 */ |
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73 class next_var_c { |
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74 private: |
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75 bool print_flag; |
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76 std::string str1, str2; |
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77 |
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78 next_var_c *embedded_scope; |
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79 |
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80 public: |
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81 next_var_c(std::string s1, std::string s2) { |
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82 str1 = s1; |
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83 str2 = s2; |
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84 print_flag = false; |
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85 embedded_scope = NULL; |
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86 } |
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87 |
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88 std::string get(void) { |
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89 if (NULL != embedded_scope) |
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90 return embedded_scope->get(); |
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91 |
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92 bool old_print_flag = print_flag; |
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93 print_flag = true; |
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94 if (!old_print_flag) |
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95 return str1; |
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96 else |
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97 return str2; |
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98 } |
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99 |
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100 /* Create a new next_var_c for an embedded scope. |
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101 * From now on, every call to get() will return the |
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102 * inner-most scope...! |
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103 */ |
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104 void push(std::string s1, std::string s2) { |
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105 if (NULL != embedded_scope) |
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106 return embedded_scope->push(s1, s2); |
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107 |
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108 embedded_scope = new next_var_c(s1, s2); |
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109 if (NULL == embedded_scope) |
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110 ERROR; |
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111 return; |
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112 } |
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113 |
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114 /* Remove the inner-most scope... */ |
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115 void pop(void) { |
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116 if (NULL != embedded_scope) |
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117 return embedded_scope->pop(); |
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118 |
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119 delete embedded_scope; |
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120 embedded_scope = NULL; |
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121 } |
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122 }; |
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123 |
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124 private: |
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125 /* used to generate the ',' separating the parameters in a function call */ |
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126 next_var_c *nv; |
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127 |
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128 |
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129 public: |
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130 /* the types of variables that need to be processed... */ |
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131 static const unsigned int none_vt = 0x0000; |
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132 static const unsigned int input_vt = 0x0001; // VAR_INPUT |
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133 static const unsigned int output_vt = 0x0002; // VAR_OUTPUT |
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134 static const unsigned int inoutput_vt = 0x0004; // VAR_IN_OUT |
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135 static const unsigned int private_vt = 0x0008; // VAR |
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136 static const unsigned int temp_vt = 0x0010; // VAR_TEMP |
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137 static const unsigned int external_vt = 0x0020; // VAR_EXTERNAL |
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138 static const unsigned int global_vt = 0x0040; // VAR_GLOBAL |
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139 // Globals declared inside a resource will not be declared |
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140 // unless global_vt is acompanied by resource_vt |
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141 static const unsigned int located_vt = 0x0080; // VAR <var_name> AT <location> |
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142 static const unsigned int program_vt = 0x0100; // PROGRAM (inside a configuration!) |
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143 // Programs declared inside a resource will not be declared |
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144 // unless program_vt is acompanied by resource_vt |
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145 |
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146 static const unsigned int resource_vt = 0x8000; // RESOURCE (inside a configuration!) |
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147 // This, just of itself, will not print out any declarations!! |
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148 // It must be acompanied by either program_vt and/or global_vt |
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149 |
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150 /* How variables should be declared: as local variables or |
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151 * variables within a function call interface. |
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152 * |
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153 * This will define the format of the output generated |
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154 * by this class. |
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155 * |
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156 * finterface_vf: function interface parameters |
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157 * e.g. f( int a, long b, real c ); |
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158 * --------------------- |
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159 * This class/function will produce the |
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160 * underlined code of the above examples, |
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161 * and no more!! |
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162 * |
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163 * localinit_vf: local declaration. Will include variable |
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164 * initialisation if it is not a located variable. |
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165 * e.g. |
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166 * int a = 9; |
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167 * long b = 99; |
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168 * real c = 99.9; |
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169 * |
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170 * local_vf: local declaration. Will NOT include variable |
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171 * initialisation. |
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172 * e.g. |
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173 * int a; |
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174 * long b; |
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175 * real c; |
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176 * |
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177 * init_vf: local initialisation without declaration. |
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178 * e.g. |
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179 * a = 9; |
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180 * b = 99; |
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181 * c = 99.9; |
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182 * |
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183 * constructorinit_vf: initialising of member variables... |
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184 * e.g. for a constructor... |
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185 * class_name_c(void) |
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186 * : a(9), b(99), c(99.9) { // code... } |
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187 * -------------------- |
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188 * This class/function will produce the |
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189 * underlined code of the above examples, |
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190 * and no more!! |
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191 * |
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192 * globalinit_vf: initialising of static c++ variables. These |
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193 * variables may have been declared as static inside |
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194 * a class, in which case the scope within which they were |
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195 * previously delcared must be passed as the second parameter |
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196 * to the print() function. |
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197 * |
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198 * e.g. |
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199 * __plc_pt_c<INT, 8*sizeof(INT)> START_P::loc = __plc_pt_c<INT, 8*sizeof(INT)>("I2"); |
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200 */ |
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201 typedef enum {finterface_vf, |
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202 local_vf, |
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203 localstatic_vf, |
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204 localinit_vf, |
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205 init_vf, |
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206 constructorinit_vf, |
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207 globalinit_vf |
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208 } varformat_t; |
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209 |
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210 |
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211 private: |
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212 /* variable used to store the types of variables that need to be processed... */ |
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213 /* Only set in the constructor...! */ |
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214 /* Will contain a set of values of generate_c_vardecl_c::XXXX_vt */ |
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215 unsigned int wanted_vartype; |
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216 /* variable used to store the type of variable currently being processed... */ |
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217 /* Will contain a single value of generate_c_vardecl_c::XXXX_vt */ |
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218 unsigned int current_vartype; |
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219 |
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220 /* How variables should be declared: as local variables or |
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221 * variables within a function interface... |
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222 */ |
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223 /* Only set in the constructor...! */ |
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224 varformat_t wanted_varformat; |
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225 |
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226 /* The number of variables already declared. */ |
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227 /* Used to declare 'void' in case no variables are declared in a function interface... */ |
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228 int finterface_var_count; |
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229 |
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230 |
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231 |
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232 /* Holds the references to the type and initial value |
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233 * of the variables currently being declared. |
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234 * Please read the comment under var1_init_decl_c for further |
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235 * details... |
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236 * |
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237 * We make an effort to keep these pointers pointing to NULL |
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238 * whenever we are outside the scope of variable declaration |
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239 * (i.e. when we are traversing a part of the parse tree which |
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240 * is not part of variable declaration) in order tio try to catch |
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241 * any bugs as soon as possible. |
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242 */ |
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243 symbol_c *current_var_type_symbol; |
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244 symbol_c *current_var_init_symbol; |
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245 void update_type_init(symbol_c *symbol /* a spec_init_c, subrange_spec_init_c, etc... */ ) { |
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246 this->current_var_type_symbol = spec_init_sperator_c::get_spec(symbol); |
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247 this->current_var_init_symbol = spec_init_sperator_c::get_init(symbol); |
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248 if (NULL == this->current_var_type_symbol) |
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249 ERROR; |
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250 if (NULL == this->current_var_init_symbol) { |
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251 /* We try to find the data type's default value... */ |
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252 this->current_var_init_symbol = (symbol_c *)this->current_var_type_symbol->accept(*type_initial_value_c::instance()); |
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253 /* Note that Function Block 'data types' do not have a default value, so we cannot abort if no default value is found! */ |
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254 /* |
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255 if (NULL == this->current_var_init_symbol) |
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256 ERROR; |
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257 */ |
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258 } |
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259 } |
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260 |
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261 void void_type_init(void) { |
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262 this->current_var_type_symbol = NULL; |
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263 this->current_var_init_symbol = NULL; |
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264 } |
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265 |
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266 /* Only used when wanted_varformat == globalinit_vf |
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267 * Holds a pointer to an identifier_c, which in turns contains |
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268 * the identifier of the scope within which the static member was |
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269 * declared. |
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270 */ |
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271 symbol_c *globalnamespace; |
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272 |
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273 /* Actually produce the output where variables are declared... */ |
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274 /* Note that located variables are the exception, they |
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275 * being declared in the located_var_decl_c visitor... |
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276 */ |
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277 void *declare_variables(symbol_c *symbol, bool is_fb = false) { |
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278 list_c *list = dynamic_cast<list_c *>(symbol); |
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279 /* should NEVER EVER occur!! */ |
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280 if (list == NULL) ERROR; |
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281 |
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282 /* now to produce the c equivalent... */ |
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283 if ((wanted_varformat == local_vf) || |
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284 (wanted_varformat == init_vf) || |
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285 (wanted_varformat == localinit_vf)) { |
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286 for(int i = 0; i < list->n; i++) { |
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287 s4o.print(s4o.indent_spaces); |
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288 if (wanted_varformat != init_vf) { |
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289 this->current_var_type_symbol->accept(*this); |
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290 s4o.print(" "); |
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291 } |
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292 print_variable_prefix(); |
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293 list->elements[i]->accept(*this); |
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294 if (wanted_varformat != local_vf) { |
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295 if (this->current_var_init_symbol != NULL) { |
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296 s4o.print(" = "); |
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297 this->current_var_init_symbol->accept(*this); |
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298 } |
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299 } |
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300 s4o.print(";\n"); |
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301 } |
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302 } |
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303 |
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304 if (wanted_varformat == finterface_vf) { |
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305 for(int i = 0; i < list->n; i++) { |
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306 finterface_var_count++; |
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307 s4o.print(nv->get()); |
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308 s4o.print("\n" + s4o.indent_spaces); |
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309 this->current_var_type_symbol->accept(*this); |
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310 if ((current_vartype & (output_vt | inoutput_vt)) != 0) |
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311 s4o.print(" &"); |
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312 else |
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313 s4o.print(" "); |
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314 list->elements[i]->accept(*this); |
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315 /* We do not print the initial value at function declaration! |
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316 * It is up to the caller to pass the correct default value |
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317 * if none is specified in the ST source code |
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318 */ |
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319 /* if (this->current_var_init_symbol != NULL) { |
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320 s4o.print(" = "); this->current_var_init_symbol->accept(*this);} |
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321 */ |
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322 } |
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323 } |
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324 |
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325 if (wanted_varformat == constructorinit_vf) { |
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326 for(int i = 0; i < list->n; i++) { |
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327 if (is_fb) { |
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328 s4o.print(nv->get()); |
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329 this->current_var_type_symbol->accept(*this); |
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330 s4o.print(FB_INIT_SUFFIX); |
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331 s4o.print("(&"); |
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332 this->print_variable_prefix(); |
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333 list->elements[i]->accept(*this); |
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334 s4o.print(");"); |
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335 } |
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336 else if (this->current_var_init_symbol != NULL) { |
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337 s4o.print(nv->get()); |
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338 this->print_variable_prefix(); |
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339 list->elements[i]->accept(*this); |
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340 s4o.print(" = "); |
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341 this->current_var_init_symbol->accept(*this); |
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342 s4o.print(";"); |
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343 } |
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344 } |
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345 } |
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346 |
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347 return NULL; |
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348 } |
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349 |
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350 |
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351 |
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352 |
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353 public: |
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354 generate_c_vardecl_c(stage4out_c *s4o_ptr, varformat_t varformat, unsigned int vartype) |
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355 : generate_c_typedecl_c(s4o_ptr) { |
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356 wanted_varformat = varformat; |
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357 wanted_vartype = vartype; |
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358 current_vartype = none_vt; |
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359 current_var_type_symbol = NULL; |
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360 current_var_init_symbol = NULL; |
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361 globalnamespace = NULL; |
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362 nv = NULL; |
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363 } |
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364 |
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365 ~generate_c_vardecl_c(void) {} |
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366 |
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367 |
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368 void print(symbol_c *symbol, symbol_c *scope = NULL, const char *variable_prefix = NULL) { |
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369 this->set_variable_prefix(variable_prefix); |
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370 if (globalinit_vf == wanted_varformat) |
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371 globalnamespace = scope; |
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372 |
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373 finterface_var_count = 0; |
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374 |
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375 switch (wanted_varformat) { |
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376 case constructorinit_vf: nv = new next_var_c("", "\n"+s4o.indent_spaces); break; |
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377 case finterface_vf: /* fall through... */ |
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378 case localinit_vf: /* fall through... */ |
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379 case local_vf: nv = new next_var_c("", ", "); break; |
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380 default: nv = NULL; |
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381 } /* switch() */ |
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382 |
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383 symbol->accept(*this); |
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384 |
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385 /* special case... */ |
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386 if (wanted_varformat == finterface_vf) |
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387 if (finterface_var_count == 0) |
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388 s4o.print("void"); |
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389 |
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390 delete nv; |
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391 nv = NULL; |
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392 globalnamespace = NULL; |
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393 } |
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394 |
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395 |
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396 protected: |
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397 /***************************/ |
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398 /* B 0 - Programming Model */ |
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399 /***************************/ |
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400 /* leave for derived classes... */ |
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401 |
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402 /*************************/ |
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403 /* B.1 - Common elements */ |
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404 /*************************/ |
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405 /*******************************************/ |
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406 /* B 1.1 - Letters, digits and identifiers */ |
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407 /*******************************************/ |
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408 /* done in base class(es) */ |
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409 |
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410 /*********************/ |
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411 /* B 1.2 - Constants */ |
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412 /*********************/ |
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413 /* originally empty... */ |
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414 |
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415 /******************************/ |
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416 /* B 1.2.1 - Numeric Literals */ |
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417 /******************************/ |
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418 /* done in base class(es) */ |
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419 |
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420 /*******************************/ |
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421 /* B.1.2.2 Character Strings */ |
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422 /*******************************/ |
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423 /* done in base class(es) */ |
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424 |
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425 /***************************/ |
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426 /* B 1.2.3 - Time Literals */ |
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427 /***************************/ |
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428 /************************/ |
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429 /* B 1.2.3.1 - Duration */ |
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430 /************************/ |
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431 /* done in base class(es) */ |
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432 |
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433 /************************************/ |
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434 /* B 1.2.3.2 - Time of day and Date */ |
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435 /************************************/ |
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436 /* done in base class(es) */ |
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437 |
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438 /**********************/ |
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439 /* B.1.3 - Data types */ |
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440 /**********************/ |
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441 /***********************************/ |
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442 /* B 1.3.1 - Elementary Data Types */ |
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443 /***********************************/ |
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444 /* done in base class(es) */ |
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445 |
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446 /********************************/ |
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447 /* B.1.3.2 - Generic data types */ |
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448 /********************************/ |
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449 /* originally empty... */ |
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450 |
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451 /********************************/ |
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452 /* B 1.3.3 - Derived data types */ |
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453 /********************************/ |
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454 /* done in base class(es) */ |
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455 |
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456 /*********************/ |
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457 /* B 1.4 - Variables */ |
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458 /*********************/ |
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459 /* done in base class(es) */ |
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460 |
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461 /********************************************/ |
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462 /* B.1.4.1 Directly Represented Variables */ |
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463 /********************************************/ |
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464 /* done in base class(es) */ |
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465 |
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466 /*************************************/ |
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467 /* B.1.4.2 Multi-element Variables */ |
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468 /*************************************/ |
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469 /* done in base class(es) */ |
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470 |
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471 /******************************************/ |
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472 /* B 1.4.3 - Declaration & Initialisation */ |
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473 /******************************************/ |
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474 void *visit(constant_option_c *symbol) {s4o.print("CONSTANT"); return NULL;} |
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475 void *visit(retain_option_c *symbol) {s4o.print("RETAIN"); return NULL;} |
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476 void *visit(non_retain_option_c *symbol) {s4o.print("NON_RETAIN"); return NULL;} |
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477 |
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478 void *visit(input_declarations_c *symbol) { |
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479 TRACE("input_declarations_c"); |
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480 if ((wanted_vartype & input_vt) != 0) { |
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481 /* |
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482 // TO DO ... |
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483 if (symbol->option != NULL) |
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484 symbol->option->accept(*this); |
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485 */ |
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486 //s4o.indent_right(); |
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487 current_vartype = input_vt; |
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488 symbol->input_declaration_list->accept(*this); |
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489 current_vartype = none_vt; |
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490 //s4o.indent_left(); |
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491 } |
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492 return NULL; |
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493 } |
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494 |
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495 /* helper symbol for input_declarations */ |
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496 void *visit(input_declaration_list_c *symbol) { |
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497 TRACE("input_declaration_list_c"); |
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498 print_list(symbol); |
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499 return NULL; |
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500 } |
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501 |
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502 void *visit(edge_declaration_c *symbol) { |
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503 TRACE("edge_declaration_c"); |
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504 // TO DO ... |
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505 symbol->var1_list->accept(*this); |
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506 s4o.print(" : BOOL "); |
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507 symbol->edge->accept(*this); |
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508 return NULL; |
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509 } |
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510 |
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511 void *visit(raising_edge_option_c *symbol) { |
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512 // TO DO ... |
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513 s4o.print("R_EDGE"); |
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514 return NULL; |
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515 } |
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516 |
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517 |
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518 #if 0 |
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519 /* var1_list ':' array_spec_init */ |
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520 SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init) |
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521 #endif |
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522 |
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523 /* var1_list ':' initialized_structure */ |
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524 // SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure) |
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525 void *visit(structured_var_init_decl_c *symbol) { |
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526 TRACE("structured_var_init_decl_c"); |
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527 /* Please read the comments inside the var1_init_decl_c |
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528 * visitor, as they apply here too. |
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529 */ |
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530 |
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531 /* Start off by setting the current_var_type_symbol and |
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532 * current_var_init_symbol private variables... |
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533 */ |
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534 update_type_init(symbol->initialized_structure); |
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535 |
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536 /* now to produce the c equivalent... */ |
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537 symbol->var1_list->accept(*this); |
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538 |
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539 /* Values no longer in scope, and therefore no longer used. |
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540 * Make an effort to keep them set to NULL when not in use |
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541 * in order to catch bugs as soon as possible... |
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542 */ |
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543 void_type_init(); |
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544 |
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545 return NULL; |
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546 } |
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547 |
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548 /* fb_name_list ':' function_block_type_name ASSIGN structure_initialization */ |
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549 /* structure_initialization -> may be NULL ! */ |
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550 void *visit(fb_name_decl_c *symbol) { |
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551 TRACE("fb_name_decl_c"); |
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552 /* Please read the comments inside the var1_init_decl_c |
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553 * visitor, as they apply here too. |
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554 */ |
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555 |
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556 /* Start off by setting the current_var_type_symbol and |
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557 * current_var_init_symbol private variables... |
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558 */ |
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559 update_type_init(symbol); |
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560 |
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561 /* now to produce the c equivalent... */ |
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562 symbol->fb_name_list->accept(*this); |
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563 |
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564 /* Values no longer in scope, and therefore no longer used. |
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565 * Make an effort to keep them set to NULL when not in use |
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566 * in order to catch bugs as soon as possible... |
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567 */ |
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568 void_type_init(); |
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569 |
|
570 return NULL; |
|
571 } |
|
572 |
|
573 /* fb_name_list ',' fb_name */ |
|
574 void *visit(fb_name_list_c *symbol) { |
|
575 TRACE("fb_name_list_c"); |
|
576 declare_variables(symbol, true); |
|
577 return NULL; |
|
578 } |
|
579 |
|
580 |
|
581 /* VAR_OUTPUT [RETAIN | NON_RETAIN] var_init_decl_list END_VAR */ |
|
582 /* option -> may be NULL ! */ |
|
583 void *visit(output_declarations_c *symbol) { |
|
584 TRACE("output_declarations_c"); |
|
585 if ((wanted_vartype & output_vt) != 0) { |
|
586 /* |
|
587 // TO DO ... |
|
588 if (symbol->option != NULL) |
|
589 symbol->option->accept(*this); |
|
590 */ |
|
591 //s4o.indent_right(); |
|
592 current_vartype = output_vt; |
|
593 symbol->var_init_decl_list->accept(*this); |
|
594 current_vartype = none_vt; |
|
595 //s4o.indent_left(); |
|
596 } |
|
597 return NULL; |
|
598 } |
|
599 |
|
600 /* VAR_IN_OUT var_declaration_list END_VAR */ |
|
601 void *visit(input_output_declarations_c *symbol) { |
|
602 TRACE("input_output_declarations_c"); |
|
603 if ((wanted_vartype & inoutput_vt) != 0) { |
|
604 //s4o.indent_right(); |
|
605 current_vartype = inoutput_vt; |
|
606 symbol->var_declaration_list->accept(*this); |
|
607 current_vartype = none_vt; |
|
608 //s4o.indent_left(); |
|
609 } |
|
610 return NULL; |
|
611 } |
|
612 |
|
613 /* helper symbol for input_output_declarations */ |
|
614 /* var_declaration_list var_declaration ';' */ |
|
615 void *visit(var_declaration_list_c *symbol) { |
|
616 TRACE("var_declaration_list_c"); |
|
617 print_list(symbol); |
|
618 return NULL; |
|
619 } |
|
620 |
|
621 #if 0 |
|
622 /* var1_list ':' array_specification */ |
|
623 SYM_REF2(array_var_declaration_c, var1_list, array_specification) |
|
624 #endif |
|
625 |
|
626 /* var1_list ':' structure_type_name */ |
|
627 //SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name) |
|
628 void *visit(structured_var_declaration_c *symbol) { |
|
629 TRACE("structured_var_declaration_c"); |
|
630 /* Please read the comments inside the var1_init_decl_c |
|
631 * visitor, as they apply here too. |
|
632 */ |
|
633 |
|
634 /* Start off by setting the current_var_type_symbol and |
|
635 * current_var_init_symbol private variables... |
|
636 */ |
|
637 update_type_init(symbol->structure_type_name); |
|
638 |
|
639 /* now to produce the c equivalent... */ |
|
640 symbol->var1_list->accept(*this); |
|
641 |
|
642 /* Values no longer in scope, and therefore no longer used. |
|
643 * Make an effort to keep them set to NULL when not in use |
|
644 * in order to catch bugs as soon as possible... |
|
645 */ |
|
646 void_type_init(); |
|
647 |
|
648 return NULL; |
|
649 } |
|
650 |
|
651 |
|
652 /* VAR [CONSTANT] var_init_decl_list END_VAR */ |
|
653 /* option -> may be NULL ! */ |
|
654 /* helper symbol for input_declarations */ |
|
655 void *visit(var_declarations_c *symbol) { |
|
656 TRACE("var_declarations_c"); |
|
657 if ((wanted_vartype & private_vt) != 0) { |
|
658 /* |
|
659 // TO DO ... |
|
660 if (symbol->option != NULL) |
|
661 symbol->option->accept(*this); |
|
662 */ |
|
663 current_vartype = private_vt; |
|
664 symbol->var_init_decl_list->accept(*this); |
|
665 current_vartype = none_vt; |
|
666 } |
|
667 return NULL; |
|
668 } |
|
669 |
|
670 /* VAR RETAIN var_init_decl_list END_VAR */ |
|
671 void *visit(retentive_var_declarations_c *symbol) { |
|
672 TRACE("retentive_var_declarations_c"); |
|
673 if ((wanted_vartype & private_vt) != 0) { |
|
674 current_vartype = private_vt; |
|
675 symbol->var_init_decl_list->accept(*this); |
|
676 current_vartype = none_vt; |
|
677 } |
|
678 return NULL; |
|
679 } |
|
680 |
|
681 /* VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */ |
|
682 /* option -> may be NULL ! */ |
|
683 //SYM_REF2(located_var_declarations_c, option, located_var_decl_list) |
|
684 void *visit(located_var_declarations_c *symbol) { |
|
685 TRACE("located_var_declarations_c"); |
|
686 if ((wanted_vartype & located_vt) != 0) { |
|
687 /* |
|
688 // TO DO ... |
|
689 if (symbol->option != NULL) |
|
690 symbol->option->accept(*this); |
|
691 */ |
|
692 current_vartype = located_vt; |
|
693 symbol->located_var_decl_list->accept(*this); |
|
694 current_vartype = none_vt; |
|
695 } |
|
696 return NULL; |
|
697 } |
|
698 |
|
699 /* helper symbol for located_var_declarations */ |
|
700 /* located_var_decl_list located_var_decl ';' */ |
|
701 //SYM_LIST(located_var_decl_list_c) |
|
702 void *visit(located_var_decl_list_c *symbol) { |
|
703 TRACE("located_var_decl_list_c"); |
|
704 print_list(symbol); |
|
705 return NULL; |
|
706 } |
|
707 |
|
708 |
|
709 /* [variable_name] location ':' located_var_spec_init */ |
|
710 /* variable_name -> may be NULL ! */ |
|
711 //SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused) |
|
712 void *visit(located_var_decl_c *symbol) { |
|
713 TRACE("located_var_decl_c"); |
|
714 /* Please read the comments inside the var1_init_decl_c |
|
715 * visitor, as they apply here too. |
|
716 */ |
|
717 |
|
718 /* Start off by setting the current_var_type_symbol and |
|
719 * current_var_init_symbol private variables... |
|
720 */ |
|
721 update_type_init(symbol->located_var_spec_init); |
|
722 |
|
723 /* now to produce the c equivalent... */ |
|
724 switch(wanted_varformat) { |
|
725 case local_vf: |
|
726 s4o.print(s4o.indent_spaces); |
|
727 this->current_var_type_symbol->accept(*this); |
|
728 s4o.print(" *"); |
|
729 if (symbol->variable_name != NULL) |
|
730 symbol->variable_name->accept(*this); |
|
731 else |
|
732 symbol->location->accept(*this); |
|
733 s4o.print(";\n"); |
|
734 break; |
|
735 |
|
736 case constructorinit_vf: |
|
737 s4o.print(nv->get()); |
|
738 s4o.print("{extern "); |
|
739 this->current_var_type_symbol->accept(*this); |
|
740 s4o.print(" "); |
|
741 symbol->location->accept(*this); |
|
742 s4o.print("; "); |
|
743 print_variable_prefix(); |
|
744 if (symbol->variable_name != NULL) |
|
745 symbol->variable_name->accept(*this); |
|
746 else |
|
747 symbol->location->accept(*this); |
|
748 s4o.print(" = &"); |
|
749 symbol->location->accept(*this); |
|
750 s4o.print(";}"); |
|
751 break; |
|
752 |
|
753 case globalinit_vf: |
|
754 s4o.print(s4o.indent_spaces + "__plc_pt_c<"); |
|
755 this->current_var_type_symbol->accept(*this); |
|
756 s4o.print(", 8*sizeof("); |
|
757 this->current_var_type_symbol->accept(*this); |
|
758 s4o.print(")> "); |
|
759 if (this->globalnamespace != NULL) { |
|
760 this->globalnamespace->accept(*this); |
|
761 s4o.print("::"); |
|
762 } |
|
763 if (symbol->variable_name != NULL) |
|
764 symbol->variable_name->accept(*this); |
|
765 else |
|
766 symbol->location->accept(*this); |
|
767 |
|
768 s4o.print(" = "); |
|
769 |
|
770 s4o.print(s4o.indent_spaces + "__plc_pt_c<"); |
|
771 this->current_var_type_symbol->accept(*this); |
|
772 s4o.print(", 8*sizeof("); |
|
773 this->current_var_type_symbol->accept(*this); |
|
774 s4o.print(")>(\""); |
|
775 symbol->location->accept(*this); |
|
776 s4o.print("\""); |
|
777 if (this->current_var_init_symbol != NULL) { |
|
778 s4o.print(", "); |
|
779 this->current_var_init_symbol->accept(*this); |
|
780 } |
|
781 s4o.print(");\n"); |
|
782 break; |
|
783 |
|
784 default: |
|
785 ERROR; |
|
786 } /* switch() */ |
|
787 |
|
788 /* Values no longer in scope, and therefore no longer used. |
|
789 * Make an effort to keep them set to NULL when not in use |
|
790 * in order to catch bugs as soon as possible... |
|
791 */ |
|
792 void_type_init(); |
|
793 |
|
794 return NULL; |
|
795 } |
|
796 |
|
797 |
|
798 |
|
799 |
|
800 /*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */ |
|
801 /* option -> may be NULL ! */ |
|
802 //SYM_REF2(external_var_declarations_c, option, external_declaration_list) |
|
803 void *visit(external_var_declarations_c *symbol) { |
|
804 TRACE("external_var_declarations_c"); |
|
805 if ((wanted_vartype & external_vt) != 0) { |
|
806 /* |
|
807 // TODO ... |
|
808 if (symbol->option != NULL) |
|
809 symbol->option->accept(*this); |
|
810 */ |
|
811 //s4o.indent_right(); |
|
812 current_vartype = external_vt; |
|
813 symbol->external_declaration_list->accept(*this); |
|
814 current_vartype = none_vt; |
|
815 //s4o.indent_left(); |
|
816 } |
|
817 return NULL; |
|
818 } |
|
819 |
|
820 /* helper symbol for external_var_declarations */ |
|
821 /*| external_declaration_list external_declaration';' */ |
|
822 //SYM_LIST(external_declaration_list_c) |
|
823 /* helper symbol for input_declarations */ |
|
824 void *visit(external_declaration_list_c *symbol) { |
|
825 TRACE("external_declaration_list_c"); |
|
826 print_list(symbol); |
|
827 return NULL; |
|
828 } |
|
829 |
|
830 |
|
831 /* global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */ |
|
832 //SYM_REF2(external_declaration_c, global_var_name, specification) |
|
833 void *visit(external_declaration_c *symbol) { |
|
834 TRACE("external_declaration_c"); |
|
835 /* Please read the comments inside the var1_init_decl_c |
|
836 * visitor, as they apply here too. |
|
837 */ |
|
838 |
|
839 /* Start off by setting the current_var_type_symbol and |
|
840 * current_var_init_symbol private variables... |
|
841 */ |
|
842 this->current_var_type_symbol = symbol->specification; |
|
843 this->current_var_init_symbol = NULL; |
|
844 |
|
845 /* now to produce the c equivalent... */ |
|
846 switch (wanted_varformat) { |
|
847 case local_vf: |
|
848 case localinit_vf: |
|
849 s4o.print(s4o.indent_spaces); |
|
850 this->current_var_type_symbol->accept(*this); |
|
851 s4o.print(" *"); |
|
852 symbol->global_var_name->accept(*this); |
|
853 if ((wanted_varformat == localinit_vf) && |
|
854 (this->current_var_init_symbol != NULL)) { |
|
855 s4o.print(" = "); |
|
856 this->current_var_init_symbol->accept(*this); |
|
857 } |
|
858 s4o.print(";\n"); |
|
859 break; |
|
860 |
|
861 case constructorinit_vf: |
|
862 s4o.print(nv->get()); |
|
863 s4o.print("{extern "); |
|
864 this->current_var_type_symbol->accept(*this); |
|
865 s4o.print(" *"); |
|
866 symbol->global_var_name->accept(*this); |
|
867 s4o.print("; "); |
|
868 print_variable_prefix(); |
|
869 symbol->global_var_name->accept(*this); |
|
870 s4o.print(" = "); |
|
871 symbol->global_var_name->accept(*this); |
|
872 s4o.print(";}"); |
|
873 break; |
|
874 |
|
875 case finterface_vf: |
|
876 finterface_var_count++; |
|
877 s4o.print(nv->get()); |
|
878 this->current_var_type_symbol->accept(*this); |
|
879 s4o.print(" *"); |
|
880 symbol->global_var_name->accept(*this); |
|
881 break; |
|
882 |
|
883 default: |
|
884 ERROR; |
|
885 } |
|
886 |
|
887 /* Values no longer in scope, and therefore no longer used. |
|
888 * Make an effort to keep them set to NULL when not in use |
|
889 * in order to catch bugs as soon as possible... |
|
890 */ |
|
891 void_type_init(); |
|
892 |
|
893 return NULL; |
|
894 } |
|
895 |
|
896 |
|
897 |
|
898 /*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */ |
|
899 /* option -> may be NULL ! */ |
|
900 // SYM_REF2(global_var_declarations_c, option, global_var_decl_list) |
|
901 void *visit(global_var_declarations_c *symbol) { |
|
902 TRACE("global_var_declarations_c"); |
|
903 if ((wanted_vartype & global_vt) != 0) { |
|
904 /* |
|
905 // TODO ... |
|
906 if (symbol->option != NULL) |
|
907 symbol->option->accept(*this); |
|
908 */ |
|
909 //s4o.indent_right(); |
|
910 unsigned int previous_vartype = current_vartype; |
|
911 // previous_vartype will be either none_vt, or resource_vt |
|
912 current_vartype = global_vt; |
|
913 symbol->global_var_decl_list->accept(*this); |
|
914 current_vartype = previous_vartype; |
|
915 //s4o.indent_left(); |
|
916 } |
|
917 return NULL; |
|
918 } |
|
919 |
|
920 /* helper symbol for global_var_declarations */ |
|
921 /*| global_var_decl_list global_var_decl ';' */ |
|
922 //SYM_LIST(global_var_decl_list_c) |
|
923 void *visit(global_var_decl_list_c *symbol) { |
|
924 TRACE("global_var_decl_list_c"); |
|
925 print_list(symbol); |
|
926 return NULL; |
|
927 } |
|
928 |
|
929 |
|
930 |
|
931 /*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */ |
|
932 /* type_specification ->may be NULL ! */ |
|
933 // SYM_REF2(global_var_decl_c, global_var_spec, type_specification) |
|
934 void *visit(global_var_decl_c *symbol) { |
|
935 TRACE("global_var_decl_c"); |
|
936 /* Please read the comments inside the var1_init_decl_c |
|
937 * visitor, as they apply here too. |
|
938 */ |
|
939 |
|
940 /* Start off by setting the current_var_type_symbol and |
|
941 * current_var_init_symbol private variables... |
|
942 */ |
|
943 update_type_init(symbol->type_specification); |
|
944 |
|
945 /* now to produce the c equivalent... */ |
|
946 symbol->global_var_spec->accept(*this); |
|
947 |
|
948 /* Values no longer in scope, and therefore no longer used. |
|
949 * Make an effort to keep them set to NULL when not in use |
|
950 * in order to catch bugs as soon as possible... |
|
951 */ |
|
952 void_type_init(); |
|
953 |
|
954 return NULL; |
|
955 } |
|
956 |
|
957 |
|
958 /*| global_var_name location */ |
|
959 // SYM_REF2(global_var_spec_c, global_var_name, location) |
|
960 void *visit(global_var_spec_c *symbol) { |
|
961 TRACE("global_var_spec_c"); |
|
962 |
|
963 /* now to produce the c equivalent... */ |
|
964 switch(wanted_varformat) { |
|
965 case local_vf: |
|
966 case localstatic_vf: |
|
967 /* NOTE: located variables must be declared static, as the connection to the |
|
968 * MatPLC point must be initialised at program startup, and not whenever |
|
969 * a new function block is instantiated! |
|
970 * Nevertheless, this construct never occurs inside a Function Block, but |
|
971 * only inside a configuration. In this case, only a single instance will |
|
972 * be created, directly at startup, so it is not necessary that the variables |
|
973 * be declared static. |
|
974 */ |
|
975 s4o.print(s4o.indent_spaces); |
|
976 if (symbol->global_var_name != NULL) { |
|
977 s4o.print("extern "); |
|
978 this->current_var_type_symbol->accept(*this); |
|
979 s4o.print(" "); |
|
980 symbol->location->accept(*this); |
|
981 s4o.print(";\n"); |
|
982 if (wanted_varformat == localstatic_vf) |
|
983 s4o.print("static "); |
|
984 this->current_var_type_symbol->accept(*this); |
|
985 s4o.print(" *"); |
|
986 symbol->global_var_name->accept(*this); |
|
987 s4o.print(" = &"); |
|
988 symbol->location->accept(*this); |
|
989 s4o.print(";\n"); |
|
990 } |
|
991 break; |
|
992 |
|
993 case constructorinit_vf: |
|
994 s4o.print(nv->get()); |
|
995 |
|
996 if (symbol->global_var_name != NULL) { |
|
997 s4o.print("*"); |
|
998 symbol->global_var_name->accept(*this); |
|
999 } |
|
1000 else |
|
1001 symbol->location->accept(*this); |
|
1002 s4o.print(" = "); |
|
1003 if (this->current_var_init_symbol != NULL) { |
|
1004 this->current_var_init_symbol->accept(*this); |
|
1005 } |
|
1006 s4o.print(";"); |
|
1007 break; |
|
1008 |
|
1009 default: |
|
1010 ERROR; |
|
1011 } /* switch() */ |
|
1012 |
|
1013 return NULL; |
|
1014 } |
|
1015 |
|
1016 |
|
1017 |
|
1018 /* AT direct_variable */ |
|
1019 // SYM_REF2(location_c, direct_variable, unused) |
|
1020 void *visit(location_c *symbol) { |
|
1021 TRACE("location_c"); |
|
1022 return symbol->direct_variable->accept(*this); |
|
1023 } |
|
1024 |
|
1025 |
|
1026 /*| global_var_list ',' global_var_name */ |
|
1027 //SYM_LIST(global_var_list_c) |
|
1028 void *visit(global_var_list_c *symbol) { |
|
1029 TRACE("global_var_list_c"); |
|
1030 list_c *list = dynamic_cast<list_c *>(symbol); |
|
1031 /* should NEVER EVER occur!! */ |
|
1032 if (list == NULL) ERROR; |
|
1033 |
|
1034 /* now to produce the c equivalent... */ |
|
1035 switch (wanted_varformat) { |
|
1036 case local_vf: |
|
1037 case localinit_vf: |
|
1038 for(int i = 0; i < list->n; i++) { |
|
1039 s4o.print(s4o.indent_spaces); |
|
1040 this->current_var_type_symbol->accept(*this); |
|
1041 s4o.print(" __"); |
|
1042 list->elements[i]->accept(*this); |
|
1043 s4o.print(";\n"); |
|
1044 this->current_var_type_symbol->accept(*this); |
|
1045 s4o.print(" *"); |
|
1046 list->elements[i]->accept(*this); |
|
1047 s4o.print(" = &__"); |
|
1048 list->elements[i]->accept(*this); |
|
1049 #if 0 |
|
1050 if (wanted_varformat == localinit_vf) { |
|
1051 if (this->current_var_init_symbol != NULL) { |
|
1052 s4o.print(" = "); |
|
1053 this->current_var_init_symbol->accept(*this); |
|
1054 } |
|
1055 } |
|
1056 #endif |
|
1057 s4o.print(";\n"); |
|
1058 } |
|
1059 break; |
|
1060 |
|
1061 case constructorinit_vf: |
|
1062 if (this->current_var_init_symbol != NULL) { |
|
1063 for(int i = 0; i < list->n; i++) { |
|
1064 s4o.print(nv->get()); |
|
1065 |
|
1066 s4o.print("*"); |
|
1067 list->elements[i]->accept(*this); |
|
1068 s4o.print(" = "); |
|
1069 this->current_var_init_symbol->accept(*this); |
|
1070 s4o.print(";"); |
|
1071 #if 0 |
|
1072 /* The following code would be for globalinit_vf !! |
|
1073 * But it is not currently required... |
|
1074 */ |
|
1075 s4o.print(s4o.indent_spaces + "__ext_element_c<"); |
|
1076 this->current_var_type_symbol->accept(*this); |
|
1077 s4o.print("> "); |
|
1078 if (this->globalnamespace != NULL) { |
|
1079 this->globalnamespace->accept(*this); |
|
1080 s4o.print("::"); |
|
1081 } |
|
1082 list->elements[i]->accept(*this); |
|
1083 |
|
1084 if (this->current_var_init_symbol != NULL) { |
|
1085 s4o.print(" = "); |
|
1086 s4o.print("__ext_element_c<"); |
|
1087 this->current_var_type_symbol->accept(*this); |
|
1088 s4o.print(">("); |
|
1089 this->current_var_init_symbol->accept(*this); |
|
1090 s4o.print(")"); |
|
1091 } |
|
1092 s4o.print(";\n"); |
|
1093 #endif |
|
1094 } |
|
1095 } |
|
1096 break; |
|
1097 |
|
1098 default: |
|
1099 ERROR; /* not supported, and not needed either... */ |
|
1100 } |
|
1101 |
|
1102 return NULL; |
|
1103 } |
|
1104 |
|
1105 |
|
1106 #if 0 |
|
1107 /* var1_list ':' single_byte_string_spec */ |
|
1108 SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec) |
|
1109 |
|
1110 /* STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */ |
|
1111 /* integer ->may be NULL ! */ |
|
1112 /* single_byte_character_string ->may be NULL ! */ |
|
1113 SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string) |
|
1114 |
|
1115 /* var1_list ':' double_byte_string_spec */ |
|
1116 SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec) |
|
1117 |
|
1118 /* WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */ |
|
1119 /* integer ->may be NULL ! */ |
|
1120 /* double_byte_character_string ->may be NULL ! */ |
|
1121 SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string) |
|
1122 |
|
1123 /*| VAR [RETAIN|NON_RETAIN] incompl_located_var_decl_list END_VAR */ |
|
1124 /* option ->may be NULL ! */ |
|
1125 SYM_REF2(incompl_located_var_declarations_c, option, incompl_located_var_decl_list) |
|
1126 |
|
1127 /* helper symbol for incompl_located_var_declarations */ |
|
1128 /*| incompl_located_var_decl_list incompl_located_var_decl ';' */ |
|
1129 SYM_LIST(incompl_located_var_decl_list_c) |
|
1130 |
|
1131 /* variable_name incompl_location ':' var_spec */ |
|
1132 SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused) |
|
1133 |
|
1134 /* AT incompl_location_token */ |
|
1135 SYM_TOKEN(incompl_location_c) |
|
1136 #endif |
|
1137 |
|
1138 |
|
1139 void *visit(falling_edge_option_c *symbol) { |
|
1140 // TO DO ... |
|
1141 s4o.print("F_EDGE"); |
|
1142 return NULL; |
|
1143 } |
|
1144 |
|
1145 |
|
1146 void *visit(var1_init_decl_c *symbol) { |
|
1147 TRACE("var1_init_decl_c"); |
|
1148 /* We have several implementation alternatives here... |
|
1149 * |
|
1150 * The issue is that generation of c code |
|
1151 * based on the abstract syntax tree requires the reversal |
|
1152 * of the symbol order compared to st. For e.g.: |
|
1153 * (ST) a, b, c: INT := 98; |
|
1154 * (C ) int a=98, b=98, c=98; |
|
1155 * The spec_init contains the references to 'INT' and '98'. |
|
1156 * The var1_list contains the references to 'a', 'b', and 'c'. |
|
1157 * The var1_init_decl_c contains the references to spec_init and var1_list. |
|
1158 * |
|
1159 * For c code generation, the var1_init_decl_c visitor |
|
1160 * would need to access the internals of other classes |
|
1161 * (e.g. the simple_spec_init_c). |
|
1162 * |
|
1163 * We can do this using one of three methods: |
|
1164 * 1) Create the abstract syntax tree differently; |
|
1165 * 2) Access other classes from within the var1_init_decl_c; |
|
1166 * 3) Pass info between the visitors using global variables |
|
1167 * only acessible by this class (private vars) |
|
1168 * |
|
1169 * In 1), the abstract syntax tree would be built so that |
|
1170 * var1_init_decl_c would contain direct references to |
|
1171 * var1_list_c, to the var type 'INT' and to the initialiser '98' |
|
1172 * (as per the example above). |
|
1173 * |
|
1174 * 2) would have several sub-options to obtain the references |
|
1175 * to 'INT' and '98' from within var1_init_decl_c. |
|
1176 * In 2a), the var1_init_decl_c would use dynamic casts to determine |
|
1177 * the class of spec_init (simple_spec_init_c, subrange_spec_init_c or |
|
1178 * enumerated_spec_init_c), and from there obtain the 'INT' and '98' |
|
1179 * In 2b) var1_init_decl_c would have one reference for each |
|
1180 * simple_spec_init_c, subrange_spec_init_c and enumerated_spec_init_c, |
|
1181 * the apropriate one being initialised by the var1_init_decl_c constructor. |
|
1182 * Note that the constructor would use dynamic casts. In essence, we |
|
1183 * would merely be changing the location of the code with the |
|
1184 * dynamic casts. |
|
1185 * In 2c) we would use three overloaded constructors for var1_init_decl_c |
|
1186 * one each for simple_spec_init_c, etc... This implies |
|
1187 * use type specific pointers to each symbol in the bison |
|
1188 * parser, instead of simply using a symbol_c * for all symbols; |
|
1189 * |
|
1190 * In 3), we use two global but private variables with references to |
|
1191 * 'INT' and '98', that would be initiliased by the visitors to |
|
1192 * simple_spec_init_c, subrange_spec_init_c and enumerated_spec_init_c. |
|
1193 * The visitor to var1_list_c would then use the references in the global |
|
1194 * variables. |
|
1195 * |
|
1196 * I (Mario) have chosen to use 3). |
|
1197 */ |
|
1198 |
|
1199 /* Start off by setting the current_var_type_symbol and |
|
1200 * current_var_init_symbol private variables... |
|
1201 */ |
|
1202 update_type_init(symbol->spec_init); |
|
1203 |
|
1204 /* now to produce the c equivalent... */ |
|
1205 symbol->var1_list->accept(*this); |
|
1206 |
|
1207 /* Values no longer in scope, and therefore no longer used. |
|
1208 * Make an effort to keep them set to NULL when not in use |
|
1209 * in order to catch bugs as soon as possible... |
|
1210 */ |
|
1211 void_type_init(); |
|
1212 |
|
1213 return NULL; |
|
1214 } |
|
1215 |
|
1216 |
|
1217 |
|
1218 void *visit(var1_list_c *symbol) { |
|
1219 TRACE("var1_list_c"); |
|
1220 declare_variables(symbol); |
|
1221 return NULL; |
|
1222 } |
|
1223 |
|
1224 |
|
1225 |
|
1226 |
|
1227 /* intermediate helper symbol for: |
|
1228 * - non_retentive_var_decls |
|
1229 * - output_declarations |
|
1230 */ |
|
1231 void *visit(var_init_decl_list_c *symbol) { |
|
1232 TRACE("var_init_decl_list_c"); |
|
1233 return print_list(symbol); |
|
1234 return NULL; |
|
1235 } |
|
1236 |
|
1237 |
|
1238 /**************************************/ |
|
1239 /* B.1.5 - Program organization units */ |
|
1240 /**************************************/ |
|
1241 /***********************/ |
|
1242 /* B 1.5.1 - Functions */ |
|
1243 /***********************/ |
|
1244 /* The missing function_declaration_c |
|
1245 * is handled in derived classes |
|
1246 */ |
|
1247 |
|
1248 |
|
1249 |
|
1250 /* intermediate helper symbol for function_declaration */ |
|
1251 void *visit(var_declarations_list_c *symbol) { |
|
1252 TRACE("var_declarations_list_c"); |
|
1253 return print_list(symbol); |
|
1254 } |
|
1255 |
|
1256 |
|
1257 void *visit(function_var_decls_c *symbol) { |
|
1258 TRACE("function_var_decls_c"); |
|
1259 |
|
1260 if ((wanted_vartype & private_vt) != 0) { |
|
1261 /* |
|
1262 // TO DO ... |
|
1263 if (symbol->option != NULL) |
|
1264 symbol->option->accept(*this); |
|
1265 */ |
|
1266 current_vartype = private_vt; |
|
1267 symbol->decl_list->accept(*this); |
|
1268 current_vartype = none_vt; |
|
1269 } |
|
1270 return NULL; |
|
1271 } |
|
1272 |
|
1273 |
|
1274 /* intermediate helper symbol for function_var_decls */ |
|
1275 void *visit(var2_init_decl_list_c *symbol) { |
|
1276 TRACE("var2_init_decl_list_c"); |
|
1277 print_list(symbol); |
|
1278 return NULL; |
|
1279 } |
|
1280 |
|
1281 |
|
1282 /*****************************/ |
|
1283 /* B 1.5.2 - Function Blocks */ |
|
1284 /*****************************/ |
|
1285 |
|
1286 /* The missing function_block_declaration_c |
|
1287 * is handled in derived classes |
|
1288 */ |
|
1289 |
|
1290 |
|
1291 /* VAR_TEMP temp_var_decl_list END_VAR */ |
|
1292 void *visit(temp_var_decls_c *symbol) { |
|
1293 TRACE("temp_var_decls_c"); |
|
1294 if ((wanted_vartype & temp_vt) != 0) { |
|
1295 current_vartype = temp_vt; |
|
1296 symbol->var_decl_list->accept(*this); |
|
1297 current_vartype = none_vt; |
|
1298 } |
|
1299 return NULL; |
|
1300 } |
|
1301 |
|
1302 /* intermediate helper symbol for temp_var_decls */ |
|
1303 void *visit(temp_var_decls_list_c *symbol) { |
|
1304 TRACE("temp_var_decls_list_c"); |
|
1305 return print_list(symbol); |
|
1306 } |
|
1307 |
|
1308 /* VAR NON_RETAIN var_init_decl_list END_VAR */ |
|
1309 void *visit(non_retentive_var_decls_c *symbol) { |
|
1310 TRACE("non_retentive_var_decls_c"); |
|
1311 // TODO ... guarantee the non-retain semantics! |
|
1312 if ((wanted_vartype & private_vt) != 0) { |
|
1313 current_vartype = private_vt; |
|
1314 symbol->var_decl_list->accept(*this); |
|
1315 current_vartype = none_vt; |
|
1316 } |
|
1317 return NULL; |
|
1318 } |
|
1319 |
|
1320 |
|
1321 |
|
1322 /**********************/ |
|
1323 /* B 1.5.3 - Programs */ |
|
1324 /**********************/ |
|
1325 /* leave for derived classes... */ |
|
1326 |
|
1327 /*********************************************/ |
|
1328 /* B.1.6 Sequential function chart elements */ |
|
1329 /*********************************************/ |
|
1330 |
|
1331 /********************************/ |
|
1332 /* B 1.7 Configuration elements */ |
|
1333 /********************************/ |
|
1334 /* Programs instantiated inside configurations are declared as variables!! */ |
|
1335 |
|
1336 /* |
|
1337 CONFIGURATION configuration_name |
|
1338 optional_global_var_declarations |
|
1339 (resource_declaration_list | single_resource_declaration) |
|
1340 optional_access_declarations |
|
1341 optional_instance_specific_initializations |
|
1342 END_CONFIGURATION |
|
1343 */ |
|
1344 /* |
|
1345 SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused) |
|
1346 */ |
|
1347 void *visit(configuration_declaration_c *symbol) { |
|
1348 TRACE("configuration_declaration_c"); |
|
1349 |
|
1350 if(symbol->global_var_declarations) |
|
1351 symbol->global_var_declarations->accept(*this); // will contain VAR_GLOBAL declarations!! |
|
1352 symbol->resource_declarations->accept(*this); // will contain PROGRAM declarations!! |
|
1353 return NULL; |
|
1354 } |
|
1355 |
|
1356 |
|
1357 /* helper symbol for configuration_declaration */ |
|
1358 // SYM_LIST(resource_declaration_list_c) |
|
1359 void *visit(resource_declaration_list_c *symbol) { |
|
1360 TRACE("resource_declaration_list_c"); |
|
1361 |
|
1362 return print_list(symbol); |
|
1363 } |
|
1364 |
|
1365 /* |
|
1366 RESOURCE resource_name ON resource_type_name |
|
1367 optional_global_var_declarations |
|
1368 single_resource_declaration |
|
1369 END_RESOURCE |
|
1370 */ |
|
1371 // SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration) |
|
1372 void *visit(resource_declaration_c *symbol) { |
|
1373 TRACE("resource_declaration_c"); |
|
1374 |
|
1375 if ((wanted_vartype & resource_vt) != 0) { |
|
1376 s4o.print(s4o.indent_spaces + "struct {\n"); |
|
1377 s4o.indent_right(); |
|
1378 |
|
1379 current_vartype = resource_vt; |
|
1380 if (NULL != symbol->global_var_declarations) |
|
1381 symbol->global_var_declarations->accept(*this); // will contain VAR_GLOBAL declarations!! |
|
1382 if (NULL != symbol->resource_declaration) |
|
1383 symbol->resource_declaration->accept(*this); // will contain PROGRAM declarations!! |
|
1384 current_vartype = none_vt; |
|
1385 |
|
1386 s4o.indent_left(); |
|
1387 s4o.print(s4o.indent_spaces + "} "); |
|
1388 symbol->resource_name->accept(*this); |
|
1389 s4o.print(";\n"); |
|
1390 } |
|
1391 return NULL; |
|
1392 } |
|
1393 |
|
1394 /* task_configuration_list program_configuration_list */ |
|
1395 // SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list) |
|
1396 void *visit(single_resource_declaration_c *symbol) { |
|
1397 TRACE("single_resource_declaration_c"); |
|
1398 |
|
1399 if ((wanted_vartype & program_vt) != 0) { |
|
1400 unsigned int previous_vartype = current_vartype; |
|
1401 // previous_vartype will be resource_vt |
|
1402 current_vartype = program_vt; |
|
1403 symbol->program_configuration_list->accept(*this); |
|
1404 current_vartype = previous_vartype; |
|
1405 } |
|
1406 return NULL; |
|
1407 } |
|
1408 |
|
1409 |
|
1410 /* helper symbol for single_resource_declaration */ |
|
1411 // SYM_LIST(task_configuration_list_c) |
|
1412 |
|
1413 |
|
1414 /* helper symbol for single_resource_declaration */ |
|
1415 /* | program_configuration_list program_configuration ';' */ |
|
1416 // SYM_LIST(program_configuration_list_c) |
|
1417 void *visit(program_configuration_list_c *symbol) { |
|
1418 TRACE("program_configuration_list_c"); |
|
1419 |
|
1420 return print_list(symbol); |
|
1421 } |
|
1422 |
|
1423 /* helper symbol for |
|
1424 * - access_path |
|
1425 * - instance_specific_init |
|
1426 */ |
|
1427 // SYM_LIST(any_fb_name_list_c) |
|
1428 |
|
1429 /* [resource_name '.'] global_var_name ['.' structure_element_name] */ |
|
1430 // SYM_REF4(global_var_reference_c, resource_name, global_var_name, structure_element_name, unused) |
|
1431 |
|
1432 /* prev_declared_program_name '.' symbolic_variable */ |
|
1433 // SYM_REF2(program_output_reference_c, program_name, symbolic_variable) |
|
1434 |
|
1435 /* TASK task_name task_initialization */ |
|
1436 // SYM_REF2(task_configuration_c, task_name, task_initialization) |
|
1437 |
|
1438 /* '(' [SINGLE ASSIGN data_source ','] [INTERVAL ASSIGN data_source ','] PRIORITY ASSIGN integer ')' */ |
|
1439 // SYM_REF4(task_initialization_c, single_data_source, interval_data_source, priority_data_source, unused) |
|
1440 |
|
1441 /* PROGRAM [RETAIN | NON_RETAIN] program_name [WITH task_name] ':' program_type_name ['(' prog_conf_elements ')'] */ |
|
1442 // SYM_REF6(program_configuration_c, retain_option, program_name, task_name, program_type_name, prog_conf_elements, unused) |
|
1443 private: |
|
1444 /* a helper function to the program_configuration_c visitor... */ |
|
1445 void program_constructor_call(program_configuration_c *symbol) { |
|
1446 program_declaration_c *p_decl = program_type_symtable.find_value(symbol->program_type_name); |
|
1447 |
|
1448 if (p_decl == program_type_symtable.end_value()) |
|
1449 /* should never occur. The program being called MUST be in the symtable... */ |
|
1450 ERROR; |
|
1451 |
|
1452 symbol->program_name->accept(*this); |
|
1453 s4o.print("("); |
|
1454 |
|
1455 /* loop through each function parameter, find the value we should pass |
|
1456 * to it, and then output the c equivalent... |
|
1457 */ |
|
1458 function_param_iterator_c fp_iterator(p_decl); |
|
1459 function_call_param_iterator_c function_call_param_iterator(symbol); |
|
1460 identifier_c *param_name; |
|
1461 nv->push("", ", "); |
|
1462 for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) { |
|
1463 |
|
1464 symbol_c *param_type = fp_iterator.param_type(); |
|
1465 if (param_type == NULL) ERROR; |
|
1466 |
|
1467 function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction(); |
|
1468 |
|
1469 #if 0 |
|
1470 /* Get the value from a foo(<param_name> = <param_value>) style call */ |
|
1471 symbol_c *param_value = function_call_param_iterator.search(param_name); |
|
1472 #endif |
|
1473 |
|
1474 switch (param_direction) { |
|
1475 case function_param_iterator_c::direction_in: |
|
1476 case function_param_iterator_c::direction_out: |
|
1477 case function_param_iterator_c::direction_inout: |
|
1478 /* ignore them all!! */ |
|
1479 break; |
|
1480 |
|
1481 case function_param_iterator_c::direction_extref: |
|
1482 #if 0 |
|
1483 if (param_value == NULL) |
|
1484 /* This is illegal in ST and IL languages. |
|
1485 * All variables declared in a VAR_EXTERNAL __must__ |
|
1486 * be initialised to reference a specific VAR_GLOBAL variable!! |
|
1487 * |
|
1488 * The semantic checker should have caught this, we check again just the |
|
1489 * same (especially since the semantic checker has not yet been written!). |
|
1490 */ |
|
1491 ERROR; |
|
1492 s4o.print(nv->get()); |
|
1493 s4o.print("&"); |
|
1494 param_value->accept(*this); |
|
1495 #endif |
|
1496 break; |
|
1497 #if 0 |
|
1498 if (param_value == NULL) { |
|
1499 /* no parameter value given, so we pass a previously declared temporary variable. */ |
|
1500 std::string *temp_var_name = temp_var_name_factory.new_name(); |
|
1501 s4o.print(*temp_var_name); |
|
1502 delete temp_var_name; |
|
1503 } else { |
|
1504 param_value->accept(*this); |
|
1505 } |
|
1506 #endif |
|
1507 break; |
|
1508 } /* switch */ |
|
1509 } /* for(...) */ |
|
1510 |
|
1511 // symbol->parameter_assignment->accept(*this); |
|
1512 s4o.print(")"); |
|
1513 nv->pop(); |
|
1514 return; |
|
1515 } |
|
1516 |
|
1517 |
|
1518 public: |
|
1519 void *visit(program_configuration_c *symbol) { |
|
1520 TRACE("program_configuration_c"); |
|
1521 |
|
1522 /* now to produce the c equivalent... */ |
|
1523 switch (wanted_varformat) { |
|
1524 case local_vf: |
|
1525 case localinit_vf: |
|
1526 s4o.print(s4o.indent_spaces); |
|
1527 symbol->program_type_name->accept(*this); |
|
1528 s4o.print(" "); |
|
1529 symbol->program_name->accept(*this); |
|
1530 if (wanted_varformat == localinit_vf) { |
|
1531 // TODO... |
|
1532 // program_call(symbol); |
|
1533 } |
|
1534 s4o.print(";\n"); |
|
1535 break; |
|
1536 |
|
1537 case constructorinit_vf: |
|
1538 s4o.print(nv->get()); |
|
1539 program_constructor_call(symbol); |
|
1540 /* |
|
1541 symbol->program_name->accept(*this); |
|
1542 s4o.print("("); |
|
1543 symbol->prog_conf_elements->accept(*this); |
|
1544 nv->pop(); |
|
1545 s4o.print(")"); |
|
1546 */ |
|
1547 break; |
|
1548 |
|
1549 default: |
|
1550 ERROR; /* not supported, and not needed either... */ |
|
1551 } |
|
1552 |
|
1553 return NULL; |
|
1554 } |
|
1555 |
|
1556 |
|
1557 |
|
1558 /* prog_conf_elements ',' prog_conf_element */ |
|
1559 //SYM_LIST(prog_conf_elements_c) |
|
1560 void *visit(prog_conf_elements_c *symbol) { |
|
1561 TRACE("prog_conf_elements_c"); |
|
1562 |
|
1563 return print_list(symbol); |
|
1564 } |
|
1565 |
|
1566 /* fb_name WITH task_name */ |
|
1567 //SYM_REF2(fb_task_c, fb_name, task_name) |
|
1568 void *visit(fb_task_c *symbol) { |
|
1569 TRACE("fb_task_c"); |
|
1570 |
|
1571 /* TODO... |
|
1572 * |
|
1573 * NOTE: Not yet supported... |
|
1574 * We do not support allocating specific function blocks declared |
|
1575 * inside a program to be executed by a different task from the one |
|
1576 * already executing the program itself. |
|
1577 * This is mostly because I (Mario) simply do not understand the |
|
1578 * semantics the standard expects us to implement in this case. It is all |
|
1579 * very confusing, and very poorly defined in the standard! |
|
1580 */ |
|
1581 ERROR; |
|
1582 return NULL; |
|
1583 } |
|
1584 |
|
1585 |
|
1586 |
|
1587 |
|
1588 |
|
1589 |
|
1590 |
|
1591 |
|
1592 |
|
1593 |
|
1594 |
|
1595 |
|
1596 |
|
1597 |
|
1598 |
|
1599 |
|
1600 |
|
1601 |
|
1602 |
|
1603 |
|
1604 |
|
1605 |
|
1606 |
|
1607 |
|
1608 |
|
1609 |
|
1610 |
|
1611 /* any_symbolic_variable ASSIGN prog_data_source */ |
|
1612 // SYM_REF2(prog_cnxn_assign_c, symbolic_variable, prog_data_source) |
|
1613 void *visit(prog_cnxn_assign_c *symbol) { |
|
1614 TRACE("prog_cnxn_assign_c"); |
|
1615 |
|
1616 /* TODO... */ |
|
1617 return NULL; |
|
1618 } |
|
1619 |
|
1620 /* any_symbolic_variable SENDTO data_sink */ |
|
1621 // SYM_REF2(prog_cnxn_sendto_c, symbolic_variable, prog_data_source) |
|
1622 void *visit(prog_cnxn_sendto_c *symbol) { |
|
1623 TRACE("prog_cnxn_sendto_c"); |
|
1624 |
|
1625 /* TODO... */ |
|
1626 return NULL; |
|
1627 } |
|
1628 |
|
1629 #if 0 |
|
1630 /* VAR_CONFIG instance_specific_init_list END_VAR_BOGUS */ |
|
1631 SYM_REF2(instance_specific_initializations_c, instance_specific_init_list, unused) |
|
1632 |
|
1633 /* helper symbol for instance_specific_initializations */ |
|
1634 SYM_LIST(instance_specific_init_list_c) |
|
1635 |
|
1636 /* resource_name '.' program_name '.' {fb_name '.'} |
|
1637 ((variable_name [location] ':' located_var_spec_init) | (fb_name ':' fb_initialization)) |
|
1638 */ |
|
1639 SYM_REF6(instance_specific_init_c, resource_name, program_name, any_fb_name_list, variable_name, location, initialization) |
|
1640 |
|
1641 /* helper symbol for instance_specific_init */ |
|
1642 /* function_block_type_name ':=' structure_initialization */ |
|
1643 SYM_REF2(fb_initialization_c, function_block_type_name, structure_initialization) |
|
1644 |
|
1645 #endif |
|
1646 |
|
1647 |
|
1648 |
|
1649 |
|
1650 /****************************************/ |
|
1651 /* B.2 - Language IL (Instruction List) */ |
|
1652 /****************************************/ |
|
1653 /***********************************/ |
|
1654 /* B 2.1 Instructions and Operands */ |
|
1655 /***********************************/ |
|
1656 /* leave for derived classes... */ |
|
1657 |
|
1658 /*******************/ |
|
1659 /* B 2.2 Operators */ |
|
1660 /*******************/ |
|
1661 /* leave for derived classes... */ |
|
1662 |
|
1663 |
|
1664 /***************************************/ |
|
1665 /* B.3 - Language ST (Structured Text) */ |
|
1666 /***************************************/ |
|
1667 /***********************/ |
|
1668 /* B 3.1 - Expressions */ |
|
1669 /***********************/ |
|
1670 /* leave for derived classes... */ |
|
1671 |
|
1672 /********************/ |
|
1673 /* B 3.2 Statements */ |
|
1674 /********************/ |
|
1675 /* leave for derived classes... */ |
|
1676 |
|
1677 /*********************************/ |
|
1678 /* B 3.2.1 Assignment Statements */ |
|
1679 /*********************************/ |
|
1680 /* leave for derived classes... */ |
|
1681 |
|
1682 /*****************************************/ |
|
1683 /* B 3.2.2 Subprogram Control Statements */ |
|
1684 /*****************************************/ |
|
1685 /* leave for derived classes... */ |
|
1686 |
|
1687 /********************************/ |
|
1688 /* B 3.2.3 Selection Statements */ |
|
1689 /********************************/ |
|
1690 /* leave for derived classes... */ |
|
1691 |
|
1692 /********************************/ |
|
1693 /* B 3.2.4 Iteration Statements */ |
|
1694 /********************************/ |
|
1695 /* leave for derived classes... */ |
|
1696 |
|
1697 |
|
1698 |
|
1699 }; /* generate_c_vardecl_c */ |
|
1700 |
|
1701 |
|
1702 |