author | mario |
Thu, 01 Feb 2007 11:04:56 +0100 | |
changeset 6 | 94741aa26423 |
parent 0 | fb772792efd1 |
permissions | -rwxr-xr-x |
0
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/* |
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* (c) 2003 Mario de Sousa |
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* |
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* Offered to the public under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 of the |
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* License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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* Public License for more details. |
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* |
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* This code is made available on the understanding that it will not be |
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* used in safety-critical situations without a full and competent review. |
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*/ |
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|
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/* |
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* An IEC 61131-3 IL and ST compiler. |
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* |
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* Based on the |
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* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) |
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* |
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*/ |
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/* |
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* Function call parameter iterator. |
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* |
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* This is part of the 4th stage that generates |
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* a c++ source program equivalent to the IL and ST |
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* code. |
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*/ |
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//#include <stdio.h> /* required for NULL */ |
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//#include <string> |
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//#include <iostream> |
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//#include "../../util/symtable.hh" |
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//#include "generate_cc.hh" |
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/* given a function_body_c, iterate through each |
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* function in/out/inout parameter, returning the name |
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* of each parameter... |
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*/ |
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class function_call_iterator_c : public iterator_visitor_c { |
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private: |
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symbol_c *start_symbol; |
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int next_fcall, fcall_count; |
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//identifier_c *current_fcall_name; |
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symbol_c *current_fcall_name; |
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//function_invocation_c *current_finvocation; |
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symbol_c *current_finvocation; |
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public: |
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/* initialise the iterator object. |
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* We must be given a reference to the function declaration |
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* that will be analysed... |
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*/ |
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function_call_iterator_c(symbol_c *symbol) { |
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this->start_symbol = symbol; |
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next_fcall = fcall_count = 0; |
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current_finvocation = NULL; |
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current_fcall_name = NULL; |
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} |
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/* Skip to the next function call. After object creation, |
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* the object references _before_ the first, so |
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* this function must be called once to get the object to |
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* reference the first function call... |
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* |
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* Returns the function_invocation_c! |
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*/ |
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//function_invocation_c *next(void) {TRACE("function_call_iterator_c::next(): called "); |
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symbol_c *next(void) {TRACE("function_call_iterator_c::next(): called "); |
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fcall_count = 0; |
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next_fcall++; |
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current_finvocation = NULL; |
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current_fcall_name = NULL; |
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|
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start_symbol->accept(*this); |
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return current_finvocation; |
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} |
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/* Returns the name of the currently referenced function invocation */ |
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identifier_c *fname(void) { |
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identifier_c *identifier = dynamic_cast<identifier_c *>(current_fcall_name); |
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if (identifier == NULL) ERROR; |
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return identifier; |
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} |
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/***************************************/ |
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/* B.3 - Language ST (Structured Text) */ |
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/***************************************/ |
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/***********************/ |
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/* B 3.1 - Expressions */ |
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/***********************/ |
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void *visit(function_invocation_c *symbol) { |
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fcall_count++; |
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if (next_fcall == fcall_count) { |
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current_finvocation = symbol; |
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current_fcall_name = symbol->function_name; |
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} |
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return NULL; |
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} |
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/****************************************/ |
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/* B.2 - Language IL (Instruction List) */ |
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/****************************************/ |
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/***********************************/ |
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/* B 2.1 Instructions and Operands */ |
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/***********************************/ |
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/* | function_name [il_operand_list] */ |
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// SYM_REF2(il_function_call_c, function_name, il_operand_list) |
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void *visit(il_function_call_c *symbol) { |
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fcall_count++; |
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if (next_fcall == fcall_count) { |
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current_finvocation = symbol; |
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current_fcall_name = symbol->function_name; |
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} |
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return NULL; |
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} |
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131 |
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132 |
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133 |
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/* | function_name '(' eol_list [il_param_list] ')' */ |
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// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list) |
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void *visit(il_formal_funct_call_c *symbol) { |
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fcall_count++; |
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if (next_fcall == fcall_count) { |
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current_finvocation = symbol; |
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current_fcall_name = symbol->function_name; |
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} |
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return NULL; |
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} |
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|
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145 |
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}; |
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148 |
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149 |
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150 |