mario@181: /*
mario@181:  * (c) 2009 Mario de Sousa
mario@181:  *
mario@181:  * Offered to the public under the terms of the GNU General Public License
mario@181:  * as published by the Free Software Foundation; either version 2 of the
mario@181:  * License, or (at your option) any later version.
mario@181:  *
mario@181:  * This program is distributed in the hope that it will be useful, but
mario@181:  * WITHOUT ANY WARRANTY; without even the implied warranty of
mario@181:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
mario@181:  * Public License for more details.
mario@181:  *
mario@181:  * This code is made available on the understanding that it will not be
mario@181:  * used in safety-critical situations without a full and competent review.
mario@181:  */
mario@181: 
mario@181: /*
mario@181:  * An IEC 61131-3 IL and ST compiler.
mario@181:  *
mario@181:  * Based on the
mario@181:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
mario@181:  *
mario@181:  */
mario@181: 
mario@181: 
mario@181: /*
mario@181:  * This is the main stage 3a file.
mario@181:  *
mario@181:  * In stage 3a some helpful symbol tables are instanciated and populated.
mario@181:  * These symbol tables wll then be used by stage3b and atage4 code generators.
mario@181:  */
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181: // #include <stdio.h>  /* required for NULL */
mario@181: #include <string>
mario@181: #include <iostream>
mario@181: #include <sstream>
mario@181: #include <typeinfo>
mario@181: #include <list>
mario@181: #include <strings.h>
mario@181: 
mario@181: #include "../util/symtable.hh"
mario@181: #include "../util/dsymtable.hh"
mario@181: #include "../absyntax/visitor.hh"
mario@181: 
mario@181: 
mario@181: 
mario@181: //#define DEBUG
mario@181: #ifdef DEBUG
mario@181: #define TRACE(classname) printf("\n____%s____\n",classname);
mario@181: #else
mario@181: #define TRACE(classname)
mario@181: #endif
mario@181: 
mario@181: #define ERROR error_exit(__FILE__,__LINE__)
mario@181: /* function defined in main.cc */
mario@181: extern void error_exit(const char *file_name, int line_no);
mario@181: 
mario@181: 
mario@181: /***********************************************************************/
mario@181: /***********************************************************************/
mario@181: /***********************************************************************/
mario@181: /***********************************************************************/
mario@181: 
mario@181: 
mario@181: /* returns 0 if the names are equal!! */
mario@181: /* NOTE: it must ignore case!! */
mario@181: int compare_identifiers(symbol_c *ident1, symbol_c *ident2) {
mario@181: 
mario@181:   token_c *name1 = dynamic_cast<token_c *>(ident1);
mario@181:   token_c *name2 = dynamic_cast<token_c *>(ident2);
mario@181:   
mario@181:   if ((name1 == NULL) || (name2 == NULL))
mario@181:     /* invalid identifiers... */
mario@181:     return -1;
mario@181: 
mario@181:   if (strcasecmp(name1->value, name2->value) == 0)
mario@181:     return 0;
mario@181: 
mario@181:   /* identifiers do not match! */
mario@181:   return 1;
mario@181: }
mario@181: 
mario@181: 
mario@181: 
mario@181: /***********************************************************************/
mario@181: /***********************************************************************/
mario@181: /***********************************************************************/
mario@181: /***********************************************************************/
mario@181: 
mario@181: 
mario@181: 
mario@181: /* A symbol table with all globally declared functions... */
mario@181: function_declaration_c null_symbol1(NULL,NULL,NULL,NULL);
mario@181: dsymtable_c<function_declaration_c *, &null_symbol1> function_symtable;
mario@181: 
mario@181: /* A symbol table with all globally declared functions block types... */
mario@181: function_block_declaration_c null_symbol2(NULL,NULL,NULL);
mario@181: symtable_c<function_block_declaration_c *, &null_symbol2> function_block_type_symtable;
mario@181: 
mario@181: /* A symbol table with all globally declared program types... */
mario@181: program_declaration_c null_symbol3(NULL,NULL,NULL);
mario@181: symtable_c<program_declaration_c *, &null_symbol3> program_type_symtable;
mario@181: 
mario@181: /* A symbol table with all user declared type definitions... */
mario@181: /* Note that function block types and program types have their
mario@181:  * own symbol tables, so do not get placed in this symbol table!
mario@181:  */
mario@181: symbol_c null_symbol4;
mario@181: symtable_c<symbol_c *, &null_symbol4> type_symtable;
mario@181: 
mario@181: 
mario@181: 
mario@181: /***********************************************************************/
mario@181: /***********************************************************************/
mario@181: /***********************************************************************/
mario@181: /***********************************************************************/
mario@181: 
mario@181: 
mario@181: class populate_symtables_c: public iterator_visitor_c {
mario@181: 
mario@181:   public:
mario@181:     populate_symtables_c(void) {};
mario@181:     virtual ~populate_symtables_c(void) {}
mario@181: 
mario@181: 
mario@181:   public:
mario@181: 
mario@181:   /*************************/
mario@181:   /* B.1 - Common elements */
mario@181:   /*************************/
mario@181:   /*******************************************/
mario@181:   /* B 1.1 - Letters, digits and identifiers */
mario@181:   /*******************************************/
mario@181:   /*********************/
mario@181:   /* B 1.2 - Constants */
mario@181:   /*********************/
mario@181:   /******************************/
mario@181:   /* B 1.2.1 - Numeric Literals */
mario@181:   /******************************/
mario@181:   /*******************************/
mario@181:   /* B.1.2.2   Character Strings */
mario@181:   /*******************************/
mario@181:   /***************************/
mario@181:   /* B 1.2.3 - Time Literals */
mario@181:   /***************************/
mario@181:   /************************/
mario@181:   /* B 1.2.3.1 - Duration */
mario@181:   /************************/
mario@181:   /************************************/
mario@181:   /* B 1.2.3.2 - Time of day and Date */
mario@181:   /************************************/
mario@181:   /**********************/
mario@181:   /* B.1.3 - Data types */
mario@181:   /**********************/
mario@181:   /***********************************/
mario@181:   /* B 1.3.1 - Elementary Data Types */
mario@181:   /***********************************/
mario@181:   /********************************/
mario@181:   /* B.1.3.2 - Generic data types */
mario@181:   /********************************/
mario@181:   /********************************/
mario@181:   /* B 1.3.3 - Derived data types */
mario@181:   /********************************/
mario@181: 
mario@181:   /*  subrange_type_name ':' subrange_spec_init */
mario@181:   void *visit(subrange_type_declaration_c *symbol) {
mario@181:     TRACE("subrange_type_declaration_c");  
mario@181:     type_symtable.insert(symbol->subrange_type_name, symbol->subrange_spec_init);
mario@181:     return NULL;
mario@181:   }
mario@181:   
mario@181: 
mario@181:   /*  enumerated_type_name ':' enumerated_spec_init */
mario@181:   void *visit(enumerated_type_declaration_c *symbol) {
mario@181:     TRACE("enumerated_type_declaration_c");
mario@181:     type_symtable.insert(symbol->enumerated_type_name, symbol->enumerated_spec_init);
mario@181:     return NULL;
mario@181:   }
mario@181: 
mario@181: 
mario@181:   /*  identifier ':' array_spec_init */
mario@181:   void *visit(array_type_declaration_c *symbol) {
mario@181:     TRACE("array_type_declaration_c");
mario@181:     type_symtable.insert(symbol->identifier, symbol->array_spec_init);
mario@181:     return NULL;
mario@181:   }
mario@181: 
mario@181: 
mario@181:   /*  simple_type_name ':' simple_spec_init */
mario@181:   void *visit(simple_type_declaration_c *symbol) {
mario@181:     TRACE("simple_type_declaration_c");
mario@181:     type_symtable.insert(symbol->simple_type_name, symbol->simple_spec_init);
mario@181:     return NULL;
mario@181:   }
mario@181: 
mario@181: 
mario@181:   /*  structure_type_name ':' structure_specification */
mario@181:   void *visit(structure_type_declaration_c *symbol) {
mario@181:     TRACE("structure_type_declaration_c");
mario@181:     type_symtable.insert(symbol->structure_type_name, symbol->structure_specification);
mario@181:     return NULL;
mario@181:   }
mario@181:   
mario@181:   
mario@181:   
mario@181:   /*********************/
mario@181:   /* B 1.4 - Variables */
mario@181:   /*********************/
mario@181:   /********************************************/
mario@181:   /* B.1.4.1   Directly Represented Variables */
mario@181:   /********************************************/
mario@181:   /*************************************/
mario@181:   /* B.1.4.2   Multi-element Variables */
mario@181:   /*************************************/
mario@181:   /******************************************/
mario@181:   /* B 1.4.3 - Declaration & Initialisation */
mario@181:   /******************************************/
mario@181:   /**************************************/
mario@181:   /* B.1.5 - Program organization units */
mario@181:   /**************************************/
mario@181:   /***********************/
mario@181:   /* B 1.5.1 - Functions */
mario@181:   /***********************/
mario@181:   public:
mario@181:   /*   FUNCTION derived_function_name ':' elementary_type_name io_OR_function_var_declarations_list function_body END_FUNCTION */
mario@181:   /* | FUNCTION derived_function_name ':' derived_type_name io_OR_function_var_declarations_list function_body END_FUNCTION */
mario@181:   void *visit(function_declaration_c *symbol) {
mario@181:     TRACE("function_declaration_c");
mario@181:     function_symtable.insert(symbol->derived_function_name, symbol);
mario@181:   
mario@181:     /* symbol->derived_function_name->accept(*this);  */ /* Function name */
mario@181:     /* symbol->type_name->accept(*this);              */ /* return data type */
mario@181:     /* symbol->var_declarations_list->accept(*this);  */ /* Function parameters and variables */
mario@181:     /* symbol->function_body->accept(*this);          */ /* Function body */
mario@181:     return NULL;
mario@181:   }
mario@181:   
mario@181: 
mario@181:   /*****************************/
mario@181:   /* B 1.5.2 - Function Blocks */
mario@181:   /*****************************/
mario@181:   public:
mario@181:   /*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
mario@181:   //SYM_REF4(function_block_declaration_c, fblock_name, var_declarations, fblock_body, unused)
mario@181:   void *visit(function_block_declaration_c *symbol) {
mario@181:     TRACE("function_block_declaration_c");
mario@181:     function_block_type_symtable.insert(symbol->fblock_name, symbol);
mario@181:   /*
mario@181:     symbol->fblock_name->accept(*this);
mario@181:     symbol->var_declarations->accept(*this);
mario@181:     symbol->fblock_body->accept(*this);
mario@181:   */
mario@181:     return NULL;
mario@181:   }
mario@181:   
mario@181:   
mario@181:   /**********************/
mario@181:   /* B 1.5.3 - Programs */
mario@181:   /**********************/
mario@181:   public:
mario@181:   /*  PROGRAM program_type_name program_var_declarations_list function_block_body END_PROGRAM */
mario@181:   //SYM_REF4(program_declaration_c, program_type_name, var_declarations, function_block_body, unused)
mario@181:   void *visit(program_declaration_c *symbol) {
mario@181:     TRACE("program_declaration_c");
mario@181:     program_type_symtable.insert(symbol->program_type_name, symbol);
mario@181:   /*
mario@181:     symbol->program_type_name->accept(*this);
mario@181:     symbol->var_declarations->accept(*this);
mario@181:     symbol->function_block_body->accept(*this);
mario@181:   */
mario@181:     return NULL;
mario@181:   }
mario@181:   
mario@181: }; /* populate_symtables_c */
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181: void absyntax_utils_init(symbol_c *tree_root) {
mario@181:   populate_symtables_c populate_symbols;
mario@181: 
mario@181:   tree_root->accept(populate_symbols);
mario@181: }
mario@181: