mario@15: /*
mario@15:  * (c) 2007 Mario de Sousa
mario@15:  *
mario@15:  * Offered to the public under the terms of the GNU General Public License
mario@15:  * as published by the Free Software Foundation; either version 2 of the
mario@15:  * License, or (at your option) any later version.
mario@15:  *
mario@15:  * This program is distributed in the hope that it will be useful, but
mario@15:  * WITHOUT ANY WARRANTY; without even the implied warranty of
mario@15:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
mario@15:  * Public License for more details.
mario@15:  *
mario@15:  * This code is made available on the understanding that it will not be
mario@15:  * used in safety-critical situations without a full and competent review.
mario@15:  */
mario@15: 
mario@15: /*
mario@15:  * An IEC 61131-3 IL and ST compiler.
mario@15:  *
mario@15:  * Based on the
mario@15:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
mario@15:  *
mario@15:  */
mario@15: 
mario@15: 
mario@15: /*
mario@15:  * This file contains the code that calls the stage 1 (lexical anayser) 
mario@15:  * and stage 2 (syntax parser) during the first pass.
mario@15:  */
mario@15: 
mario@15: 
mario@20: /* file with declaration of absyntax classes... */
mario@20: #include "../absyntax/absyntax.hh"
mario@20: 
mario@15: 
mario@15: // #include "stage1_2.hh"
mario@15: #include "iec.y.hh"
mario@15: #include "stage1_2_priv.hh"
mario@15: 
mario@15: 
mario@15: 
mario@15: 
mario@15: 
mario@15: /**************************************/
mario@15: /* The name of the file being parsed. */
mario@15: /**************************************/
mario@15: /* The name of the file currently being parsed...
mario@15:  * Note that flex accesses and updates this global variable
mario@15:  * apropriately whenever it comes across an (*#include <filename> *)
mario@15:  * directive...
mario@15:  * ... and bison will use it when producing error messages.
mario@15:  * Note that bison also sets this variable correctly to the first
mario@15:  * file being parsed.
mario@15:  */
mario@15: const char *current_filename = NULL;
mario@15: 
mario@15: 
mario@15: 
mario@15: 
mario@15: /*****************************************************/
mario@15: /* Controlling the entry to the st_il_state in flex. */
mario@15: /*****************************************************/
mario@15: 
mario@15: static int goto_body_state__ = 0;
mario@15: 
mario@15: void cmd_goto_body_state(void) {goto_body_state__ = 1;}
mario@15: int  get_goto_body_state(void) {return goto_body_state__;}
mario@15: void rst_goto_body_state(void) {goto_body_state__ = 0;}
mario@15: 
mario@15: 
mario@15: 
mario@15: /*********************************/
mario@15: /* The global symbol tables...   */
mario@15: /*********************************/
mario@15: /* NOTE: only accessed indirectly by the lexical parser (flex)
mario@15:  *       through the function get_identifier_token()
mario@15:  */
mario@15: /* NOTE: BOGUS_TOKEN_ID is defined in the bison generated file iec.y.hh.
mario@15:  *       We need this constant defined before we can declare the symbol tables.
mario@15:  *       However, we cannot #include "iec.y.hh" in this file (stage1_2_priv.hh) directly
mario@15:  *       because of the way bison ver. 3.2 is copying all declarations in the prologue
mario@15:  *       of iec.y to the iec.y.hh file (including an #include stage1_2_priv.hh).
mario@15:  *       So, if we were to include "iec.y.hh" here, we would get a circular include.
mario@15:  *       All this means that whoever includes this file (stage1_2_priv.hh) will need
mario@15:  *       to take care to first inlcude iec.y.hh !!
mario@15:  */ 
mario@15: /* A symbol table to store all the library elements */
mario@15: /* e.g.: <function_name , function_decl>
mario@15:  *       <fb_name , fb_decl>
mario@15:  *       <type_name , type_decl>
mario@15:  *       <program_name , program_decl>
mario@15:  *       <configuration_name , configuration_decl>
mario@15:  */
mario@15: /* static */ symtable_c<int, BOGUS_TOKEN_ID> library_element_symtable;
mario@15: 
mario@15: /* A symbol table to store the declared variables of
mario@15:  * the function currently being parsed...
mario@15:  */
mario@15: /* static */ symtable_c<int, BOGUS_TOKEN_ID> variable_name_symtable;
mario@15: 
mario@15: 
mario@15: /* Function only called from within flex!
mario@15:  *
mario@15:  * search for a symbol in either of the two symbol tables
mario@15:  * declared above, and return the token id of the first
mario@15:  * symbol found.
mario@15:  * Searches first in the variables, and only if not found
mario@15:  * does it continue searching in the library elements
mario@15:  */
mario@15: int get_identifier_token(const char *identifier_str) {
mario@15: //  std::cout << "get_identifier_token(" << identifier_str << "): \n";
mario@15:   int token_id;
mario@15: 
mario@15:   if ((token_id = variable_name_symtable.find_value(identifier_str)) == variable_name_symtable.end_value())
mario@15:     if ((token_id = library_element_symtable.find_value(identifier_str)) == library_element_symtable.end_value())
mario@15:       return identifier_token;
mario@15:   return token_id;
mario@15: }
mario@15: 
mario@15: 
mario@15: /************************/
mario@15: /* Utility Functions... */
mario@15: /************************/
mario@15: 
mario@15: /*
mario@15:  * Join two strings together. Allocate space with malloc(3).
mario@15:  */
mario@15: char *strdup2(const char *a, const char *b) {
mario@15:   char *res = (char *)malloc(strlen(a) + strlen(b) + 1);
mario@15: 
mario@15:   if (!res)
mario@15:     return NULL;
mario@15:   return strcat(strcpy(res, a), b);  /* safe, actually */
mario@15: }
mario@15: 
mario@15: /*
mario@15:  * Join three strings together. Allocate space with malloc(3).
mario@15:  */
mario@15: char *strdup3(const char *a, const char *b, const char *c) {
mario@15:   char *res = (char *)malloc(strlen(a) + strlen(b) + strlen(c) + 1);
mario@15: 
mario@15:   if (!res)
mario@15:     return NULL;
mario@15:   return strcat(strcat(strcpy(res, a), b), c);  /* safe, actually */
mario@15: }
mario@15: 
mario@15: 
mario@15: 
mario@15: 
mario@15: 
mario@15: 
mario@15: /***********************************************************************/
mario@15: /***********************************************************************/
mario@15: /***********************************************************************/
mario@15: /***********************************************************************/
mario@15: /***********************************************************************/
mario@15: /***********************************************************************/
mario@15: /***********************************************************************/
mario@15: /***********************************************************************/
mario@15: /***********************************************************************/
mario@15: /***********************************************************************/
mario@15: 
mario@15: 
mario@15: int stage1_2__(const char *filename, const char *includedir, symbol_c **tree_root_ref);
mario@15: 
mario@15: 
mario@15: int stage1_2(const char *filename, const char *includedir, symbol_c **tree_root_ref) {
mario@15:   return stage1_2__(filename, includedir, tree_root_ref);
mario@15: }
mario@15: