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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) 2012 Mario de Sousa (msousa@fe.up.pt) |
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5 * |
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6 * This program is free software: you can redistribute it and/or modify |
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7 * it under the terms of the GNU General Public License as published by |
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8 * the Free Software Foundation, either version 3 of the License, or |
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9 * (at your option) any later version. |
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10 * |
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11 * This program is distributed in the hope that it will be useful, |
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 * GNU General Public License for more details. |
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15 * |
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16 * You should have received a copy of the GNU General Public License |
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17 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 * |
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19 * |
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20 * This code is made available on the understanding that it will not be |
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21 * used in safety-critical situations without a full and competent review. |
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22 */ |
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23 |
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24 /* |
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25 * An IEC 61131-3 compiler. |
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26 * |
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27 * Based on the |
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28 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) |
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29 * |
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30 */ |
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31 |
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32 |
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33 /* |
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34 * Do flow control analysis of the IEC 61131-3 code. |
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35 * |
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36 * We currently only do this for IL code. |
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37 * This class will annotate the abstract syntax tree, by filling in the |
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38 * prev_il_instruction variable in the il_instruction_c, so it points to |
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39 * the previous il_instruction_c object in the instruction list instruction_list_c. |
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40 */ |
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41 |
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42 #include "flow_control_analysis.hh" |
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43 |
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44 |
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45 |
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46 /* set to 1 to see debug info during execution */ |
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47 static int debug = 0; |
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48 |
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49 flow_control_analysis_c::flow_control_analysis_c(symbol_c *ignore) { |
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50 } |
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51 |
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52 flow_control_analysis_c::~flow_control_analysis_c(void) { |
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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 /* B 1.5 Program organization units */ |
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59 /************************************/ |
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60 /*********************/ |
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61 /* B 1.5.1 Functions */ |
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62 /*********************/ |
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63 void *flow_control_analysis_c::visit(function_declaration_c *symbol) { |
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64 search_varfb_instance_type = new search_varfb_instance_type_c(symbol); |
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65 if (debug) printf("Doing flow control analysis in body of function %s\n", ((token_c *)(symbol->derived_function_name))->value); |
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66 symbol->function_body->accept(*this); |
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67 delete search_varfb_instance_type; |
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68 search_varfb_instance_type = NULL; |
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69 return NULL; |
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70 } |
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71 |
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72 /***************************/ |
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73 /* B 1.5.2 Function blocks */ |
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74 /***************************/ |
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75 void *flow_control_analysis_c::visit(function_block_declaration_c *symbol) { |
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76 search_varfb_instance_type = new search_varfb_instance_type_c(symbol); |
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77 if (debug) printf("Doing flow control analysis in body of FB %s\n", ((token_c *)(symbol->fblock_name))->value); |
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78 symbol->fblock_body->accept(*this); |
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79 delete search_varfb_instance_type; |
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80 search_varfb_instance_type = NULL; |
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81 return NULL; |
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82 } |
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83 |
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84 /********************/ |
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85 /* B 1.5.3 Programs */ |
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86 /********************/ |
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87 void *flow_control_analysis_c::visit(program_declaration_c *symbol) { |
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88 search_varfb_instance_type = new search_varfb_instance_type_c(symbol); |
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89 if (debug) printf("Doing flow control analysis in body of program %s\n", ((token_c *)(symbol->program_type_name))->value); |
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90 symbol->function_block_body->accept(*this); |
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91 delete search_varfb_instance_type; |
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92 search_varfb_instance_type = NULL; |
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93 return NULL; |
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94 } |
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95 |
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96 |
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97 /********************************/ |
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98 /* B 1.7 Configuration elements */ |
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99 /********************************/ |
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100 void *flow_control_analysis_c::visit(configuration_declaration_c *symbol) { |
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101 return NULL; |
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102 } |
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103 |
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104 |
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105 /****************************************/ |
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106 /* B.2 - Language IL (Instruction List) */ |
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107 /****************************************/ |
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108 /***********************************/ |
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109 /* B 2.1 Instructions and Operands */ |
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110 /***********************************/ |
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111 |
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112 /*| instruction_list il_instruction */ |
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113 // SYM_LIST(instruction_list_c) |
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114 void *flow_control_analysis_c::visit(instruction_list_c *symbol) { |
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115 for(int i = 1; i < symbol->n; i++) { |
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116 prev_il_instruction = symbol->elements[i-1]; |
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117 symbol->elements[i]->accept(*this); |
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118 } |
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119 return NULL; |
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120 } |
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121 |
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122 /* | label ':' [il_incomplete_instruction] eol_list */ |
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123 // SYM_REF2(il_instruction_c, label, il_instruction) |
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124 // void *visit(instruction_list_c *symbol); |
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125 void *flow_control_analysis_c::visit(il_instruction_c *symbol) { |
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126 symbol->prev_il_instruction = prev_il_instruction; |
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127 /* TODO: handle labels correctly! |
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128 * |
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129 * Don't forget to handle multiple consecutive lables too! |
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130 * label2: |
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131 * label3: |
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132 * label4: |
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133 * LD I |
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134 */ |
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135 |
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136 return NULL; |
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137 } |
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138 |
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139 |
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140 #if 0 |
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141 /* | function_name [il_operand_list] */ |
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142 /* NOTE: The parameters 'called_function_declaration' and 'extensible_param_count' are used to pass data between the stage 3 and stage 4. */ |
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143 // SYM_REF2(il_function_call_c, function_name, il_operand_list, symbol_c *called_function_declaration; int extensible_param_count;) |
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144 void *flow_control_analysis_c::visit(il_function_call_c *symbol) { |
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145 return NULL; |
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146 } |
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147 |
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148 /* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */ |
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149 // SYM_REF3(il_expression_c, il_expr_operator, il_operand, simple_instr_list); |
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150 void *flow_control_analysis_c::visit(il_expression_c *symbol) { |
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151 return NULL; |
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152 } |
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153 |
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154 /* il_call_operator prev_declared_fb_name |
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155 * | il_call_operator prev_declared_fb_name '(' ')' |
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156 * | il_call_operator prev_declared_fb_name '(' eol_list ')' |
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157 * | il_call_operator prev_declared_fb_name '(' il_operand_list ')' |
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158 * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')' |
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159 */ |
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160 /* NOTE: The parameter 'called_fb_declaration'is used to pass data between stage 3 and stage4 (although currently it is not used in stage 4 */ |
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161 // SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list, symbol_c *called_fb_declaration) |
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162 void *flow_control_analysis_c::visit(il_fb_call_c *symbol) { |
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163 return NULL; |
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164 } |
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165 |
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166 |
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167 /* | function_name '(' eol_list [il_param_list] ')' */ |
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168 /* NOTE: The parameter 'called_function_declaration' is used to pass data between the stage 3 and stage 4. */ |
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169 // SYM_REF2(il_formal_funct_call_c, function_name, il_param_list, symbol_c *called_function_declaration; int extensible_param_count;) |
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170 void *flow_control_analysis_c::visit(il_formal_funct_call_c *symbol) { |
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171 return NULL; |
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172 } |
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173 |
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174 |
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175 /* |
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176 void *visit(il_operand_list_c *symbol); |
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177 void *visit(simple_instr_list_c *symbol); |
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178 void *visit(il_param_list_c *symbol); |
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179 void *visit(il_param_assignment_c *symbol); |
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180 void *visit(il_param_out_assignment_c *symbol); |
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181 */ |
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182 |
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183 |
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184 #endif |
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185 |