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:  * The private interface to stage1_2.cc 
mario@15:  */
mario@15: 
mario@15: 
mario@15: 
mario@20: /* !!! WARNING !!!
mario@20:  *
mario@20:  *       Whoever includes this file (stage1_2_priv.hh) will need
mario@20:  *       to first inlcude iec.y.hh !!
mario@20:  *
mario@20:  *       Read other comments further down to understand why we don't
mario@20:  *       include iec.y.hh in this file.
mario@20:  */
mario@20: 
mario@20: 
mario@20: 
mario@15: /* file with the declarations of symbol tables... */
mario@15: #include "../util/symtable.hh"
mario@177: #include "stage1_2.hh"
mario@15: 
mario@15: 
mario@15: /*
mario@15:  * This file includes the interface through which the lexical parser (stage 1 - flex)
mario@15:  * and the syntax analyser (stage 2 - bison) interact between themselves.
mario@15:  *
mario@15:  * This is mostly through direct access to shared global variables, however some
mario@15:  * of the global variables will only be accessed through some accessor functions.
mario@15:  *
mario@177:  * This file also includes the interface between the main stage1_2() functions and 
mario@177:  * the flex lexical parser.
mario@177:  *
mario@15:  * This file also includes some utility functions (strdupX() ) that are both used
mario@15:  * in the lexical and syntax analysers.
mario@15:  */
mario@15: 
mario@15: 
mario@15: 
mario@15: 
mario@177: /*************************************************************/
mario@177: /*************************************************************/
mario@177: /****                                                    *****/
mario@177: /****  I n t e r f a c e    B e t w e e n                *****/
mario@177: /****           F l e x    a n d     s t a g e 1 _ 2 ()  *****/
mario@177: /****                                                    *****/
mario@177: /*************************************************************/
mario@177: /*************************************************************/
mario@177: 
mario@177: /******************************************************/
mario@177: /* whether we are suporting safe extensions           */
mario@177: /* as defined in PLCopen - Technical Committee 5      */
mario@177: /* Safety Software Technical Specification,           */
mario@177: /* Part 1: Concepts and Function Blocks,              */
mario@177: /* Version 1.0 – Official Release                     */
mario@177: /******************************************************/
mario@177: bool get_opt_safe_extensions();
mario@177: 
mario@177: 
mario@177: 
mario@177: /*************************************************************/
mario@177: /*************************************************************/
mario@177: /****                                                    *****/
mario@177: /****  I n t e r f a c e    B e t w e e n                *****/
mario@177: /****           F l e x    a n d     B i s o n           *****/
mario@177: /****                                                    *****/
mario@177: /*************************************************************/
mario@177: /*************************************************************/
mario@15: 
mario@15: /*********************************************/
mario@15: /* print the include file stack to stderr... */
mario@15: /*********************************************/
mario@15: /* This is a service that flex provides to bison... */
mario@15: void print_include_stack(void);
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: extern const char *current_filename;
mario@15: 
mario@177: 
lbessard@136: #define MAX_BUFFER_LENGTH 1000
mario@15: 
lbessard@136: typedef struct {
lbessard@136:     int eof;
lbessard@136:     int lineNumber;
lbessard@136:     int currentChar;
lbessard@136:     int lineLength;
lbessard@136:     int currentTokenStart;
lbessard@136:     char* buffer;
lbessard@136:     FILE *in_file;
lbessard@136:   } tracking_t;
lbessard@136: 
lbessard@136: int GetNextChar(char *b, int maxBuffer);
lbessard@136: tracking_t* GetNewTracking(FILE* in_file);
mario@15: 
mario@68: /****************************************************/
mario@68: /* Controlling the entry to the body_state in flex. */
mario@68: /****************************************************/
mario@15: void cmd_goto_body_state(void);
mario@15: int  get_goto_body_state(void);
mario@15: void rst_goto_body_state(void);
mario@15: 
mario@15: 
mario@68: /*************************************************************/
mario@68: /* Controlling the entry to the sfc_qualifier_state in flex. */
mario@68: /*************************************************************/
mario@68: void cmd_goto_sfc_qualifier_state(void);
mario@68: int  get_goto_sfc_qualifier_state(void);
mario@68: void rst_goto_sfc_qualifier_state(void);
mario@68: 
mario@68: 
mario@86: /*************************************************************/
mario@86: /* Controlling the entry to the sfc_priority_state in flex.  */
mario@86: /*************************************************************/
mario@86: void cmd_goto_sfc_priority_state(void);
mario@86: int  get_goto_sfc_priority_state(void);
mario@86: void rst_goto_sfc_priority_state(void);
mario@86: 
mario@86: 
mario@74: /*********************************************************/
mario@74: /* Controlling the entry to the task_init_state in flex. */
mario@74: /*********************************************************/
mario@74: void cmd_goto_task_init_state(void);
mario@74: int  get_goto_task_init_state(void);
mario@74: void rst_goto_task_init_state(void);
mario@74: 
mario@74: 
mario@68: /****************************************************************/
mario@68: /* Returning to state in flex previously pushed onto the stack. */
mario@68: /****************************************************************/
mario@68: void cmd_pop_state(void);
mario@68: int  get_pop_state(void);
mario@68: void rst_pop_state(void);
mario@68: 
mario@68: 
mario@68: 
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@177:  *
mario@177:  *       Bison accesses these data structures directly.
mario@177:  *
mario@177:  *       In essence, they are a data passing mechanism between Bison and Flex.
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@20:  *       because of the way bison ver. 2.3 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: extern 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: extern symtable_c<int, BOGUS_TOKEN_ID> variable_name_symtable;
mario@15: 
lbessard@175: /* A symbol table to store the declared direct variables of
lbessard@175:  * the function currently being parsed...
lbessard@175:  */
lbessard@175: extern symtable_c<int, BOGUS_TOKEN_ID> direct_variable_symtable;
lbessard@175: 
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: 
lbessard@175: /* Function only called from within flex!
lbessard@175:  *
lbessard@175:  * search for a symbol in direct variables symbol table
lbessard@175:  * declared above, and return the token id of the first
lbessard@175:  * symbol found.
lbessard@175:  */
lbessard@175: int get_direct_variable_token(const char *direct_variable_str);
mario@15: 
mario@15: 
mario@177: /*************************************************************/
mario@177: /*************************************************************/
mario@177: /****                                                    *****/
mario@177: /****  U t i l i t y   F u n c t i o n s ...             *****/
mario@177: /****                                                    *****/
mario@177: /****                                                    *****/
mario@177: /*************************************************************/
mario@177: /*************************************************************/
mario@15: 
mario@15: /* Join two strings together. Allocate space with malloc(3). */
mario@15: char *strdup2(const char *a, const char *b);
mario@15: 
mario@15: /* Join three strings together. Allocate space with malloc(3). */
mario@15: char *strdup3(const char *a, const char *b, const char *c);
mario@15: 
mario@15: 
mario@15: