1 /*

     2  * (c) 2003 Mario de Sousa

     3  *

     4  * Offered to the public under the terms of the GNU General Public License

     5  * as published by the Free Software Foundation; either version 2 of the

     6  * License, or (at your option) any later version.

     7  *

     8  * This program is distributed in the hope that it will be useful, but

     9  * WITHOUT ANY WARRANTY; without even the implied warranty of

    10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General

    11  * Public License for more details.

    12  *

    13  * This code is made available on the understanding that it will not be

    14  * used in safety-critical situations without a full and competent review.

    15  */

    16 

    17 /*

    18  * An IEC 61131-3 IL and ST compiler.

    19  *

    20  * Based on the

    21  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)

    22  *

    23  */

    24 

    25 

    26 /*

    27  * Function call parameter iterator.

    28  *

    29  * This is part of the 4th stage that generates

    30  * a c++ source program equivalent to the IL and ST

    31  * code.

    32  */

    33 

    34 /* given a function_body_c, iterate through each

    35  * function in/out/inout parameter, returning the name

    36  * of each parameter...

    37  */

    38 

    39 

    40 #include "function_call_iterator.hh"

    41 

    42 

    43 //#define DEBUG

    44 #ifdef DEBUG

    45 #define TRACE(classname) printf("\n____%s____\n",classname);

    46 #else

    47 #define TRACE(classname)

    48 #endif

    49 

    50 #define ERROR error_exit(__FILE__,__LINE__)

    51 /* function defined in main.cc */

    52 extern void error_exit(const char *file_name, int line_no);

    53 

    54 

    55 

    56 

    57 

    58 /* initialise the iterator object.

    59  * We must be given a reference to the function declaration

    60  * that will be analysed...

    61  */

    62 function_call_iterator_c::function_call_iterator_c(symbol_c *symbol) {

    63   this->start_symbol = symbol;

    64   next_fcall = fcall_count = 0;

    65   current_finvocation = NULL;

    66   current_fcall_name = NULL;

    67 }

    68 

    69 /* Skip to the next function call. After object creation,

    70  * the object references _before_ the first, so

    71  * this function must be called once to get the object to

    72  * reference the first function call...

    73  *

    74  * Returns the function_invocation_c!

    75  */

    76 //function_invocation_c *next(void) {TRACE("function_call_iterator_c::next(): called ");

    77 symbol_c *function_call_iterator_c::next(void) {TRACE("function_call_iterator_c::next(): called ");

    78   fcall_count = 0;

    79   next_fcall++;

    80   current_finvocation = NULL;

    81   current_fcall_name = NULL;

    82 

    83   start_symbol->accept(*this);

    84   return current_finvocation;

    85 }

    86 

    87 /* Returns the name of the currently referenced function invocation */

    88 identifier_c *function_call_iterator_c::fname(void) {

    89   identifier_c *identifier = dynamic_cast<identifier_c *>(current_fcall_name);

    90   if (identifier == NULL) ERROR;

    91   return identifier;

    92 }

    93 

    94 

    95 /***************************************/

    96 /* B.3 - Language ST (Structured Text) */

    97 /***************************************/

    98 /***********************/

    99 /* B 3.1 - Expressions */

   100 /***********************/

   101   void *function_call_iterator_c::visit(function_invocation_c *symbol) {

   102     fcall_count++;

   103     if (next_fcall == fcall_count) {

   104       current_finvocation = symbol;

   105       current_fcall_name = symbol->function_name;

   106     }

   107     return NULL;

   108   }

   109 

   110 

   111 

   112 /****************************************/

   113 /* B.2 - Language IL (Instruction List) */

   114 /****************************************/

   115 /***********************************/

   116 /* B 2.1 Instructions and Operands */

   117 /***********************************/

   118 

   119 /* | function_name [il_operand_list] */

   120 // SYM_REF2(il_function_call_c, function_name, il_operand_list)

   121   void *function_call_iterator_c::visit(il_function_call_c *symbol) {

   122     fcall_count++;

   123     if (next_fcall == fcall_count) {

   124       current_finvocation = symbol;

   125       current_fcall_name = symbol->function_name;

   126     }

   127     return NULL;

   128   }

   129 

   130 

   131 

   132 /* | function_name '(' eol_list [il_param_list] ')' */

   133 // SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)

   134   void *function_call_iterator_c::visit(il_formal_funct_call_c *symbol) {

   135     fcall_count++;

   136     if (next_fcall == fcall_count) {

   137       current_finvocation = symbol;

   138       current_fcall_name = symbol->function_name;

   139     }

   140     return NULL;

   141   }

   142 

   143 

   144 

   145 

   146