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/*

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 * (c) 2007 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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 * 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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 * The private interface to stage1_2.cc 

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 */

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/* !!! WARNING !!!

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 *

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 *       Whoever includes this file (stage1_2_priv.hh) will need

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 *       to first inlcude iec.y.hh !!

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 *

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 *       Read other comments further down to understand why we don't

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 *       include iec.y.hh in this file.

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 */

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/* file with the declarations of symbol tables... */

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#include "../util/symtable.hh"

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/*

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 * This file includes the interface through which the lexical parser (stage 1 - flex)

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 * and the syntax analyser (stage 2 - bison) interact between themselves.

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 *

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 * This is mostly through direct access to shared global variables, however some

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 * of the global variables will only be accessed through some accessor functions.

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 *

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 * This file also includes some utility functions (strdupX() ) that are both used

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 * in the lexical and syntax analysers.

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 */

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/*********************************************/

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/* print the include file stack to stderr... */

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/*********************************************/

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/* This is a service that flex provides to bison... */

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void print_include_stack(void);

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/**************************************/

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/* The name of the file being parsed. */

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/**************************************/

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/* The name of the file currently being parsed...

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 * Note that flex accesses and updates this global variable

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 * apropriately whenever it comes across an (*#include <filename> *)

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 * directive...

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 * ... and bison will use it when producing error messages.

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 * Note that bison also sets this variable correctly to the first

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 * file being parsed.

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 */

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extern const char *current_filename;

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/*****************************************************/

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/* Controlling the entry to the st_il_state in flex. */

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/*****************************************************/

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void cmd_goto_body_state(void);

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int  get_goto_body_state(void);

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void rst_goto_body_state(void);

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/*********************************/

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/* The global symbol tables...   */

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/*********************************/

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/* NOTE: only accessed indirectly by the lexical parser (flex)

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 *       through the function get_identifier_token()

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 */

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/* NOTE: BOGUS_TOKEN_ID is defined in the bison generated file iec.y.hh.

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 *       We need this constant defined before we can declare the symbol tables.

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 *       However, we cannot #include "iec.y.hh" in this file (stage1_2_priv.hh) directly

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 *       because of the way bison ver. 2.3 is copying all declarations in the prologue

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 *       of iec.y to the iec.y.hh file (including an #include stage1_2_priv.hh).

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 *       So, if we were to include "iec.y.hh" here, we would get a circular include.

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 *       All this means that whoever includes this file (stage1_2_priv.hh) will need

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 *       to take care to first inlcude iec.y.hh !!

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 */ 

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/* A symbol table to store all the library elements */

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/* e.g.: <function_name , function_decl>

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 *       <fb_name , fb_decl>

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 *       <type_name , type_decl>

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 *       <program_name , program_decl>

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 *       <configuration_name , configuration_decl>

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 */

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extern symtable_c<int, BOGUS_TOKEN_ID> library_element_symtable;

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/* A symbol table to store the declared variables of

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 * the function currently being parsed...

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 */

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extern symtable_c<int, BOGUS_TOKEN_ID> variable_name_symtable;

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/* Function only called from within flex!

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 *

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 * search for a symbol in either of the two symbol tables

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 * declared above, and return the token id of the first

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 * symbol found.

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 * Searches first in the variables, and only if not found

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 * does it continue searching in the library elements

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 */

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int get_identifier_token(const char *identifier_str);

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/************************/

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/* Utility Functions... */

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/************************/

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/* Join two strings together. Allocate space with malloc(3). */

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char *strdup2(const char *a, const char *b);

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/* Join three strings together. Allocate space with malloc(3). */

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char *strdup3(const char *a, const char *b, const char *c);

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