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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 /* Returns the data type of an il_operand. |
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26 * |
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27 * Note that the il_operand may be a variable, in which case |
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28 * we return the type of the variable instance. |
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29 * The il_operand may also be a constant, in which case |
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30 * we return the data type of that constant. |
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31 * |
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32 * The variable instance may be a member of a structured variable, |
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33 * or an element in an array, or any combination of the two. |
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34 * |
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35 * The class constructor must be given the search scope |
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36 * (function, function block or program within which |
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37 * the possible il_operand variable instance was declared). |
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38 */ |
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39 |
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40 class search_il_operand_type_c { |
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41 |
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42 private: |
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43 search_varfb_instance_type_c search_varfb_instance_type; |
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44 search_constant_type_c search_constant_type; |
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45 |
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46 public: |
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47 search_il_operand_type_c(symbol_c *search_scope): search_varfb_instance_type(search_scope) {} |
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48 |
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49 public: |
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50 symbol_c *get_type(symbol_c *il_operand); |
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51 }; |