stage1_2/stage1_2_priv.hh
author mjsousa
Tue, 30 Dec 2014 23:31:36 +0000
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Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *
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 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
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 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
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 *
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 *  This program is free software: you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation, either version 3 of the License, or
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 *  (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,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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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 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_bison.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_bison.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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#include "stage1_2.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 the interface between the main stage1_2() functions and 
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 * the flex lexical parser.
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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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/*************************************************************/
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/****                                                    *****/
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/****  I n t e r f a c e    B e t w e e n                *****/
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/****           F l e x    a n d     s t a g e 1 _ 2 ()  *****/
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/****                                                    *****/
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/*************************************************************/
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/*************************************************************/
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/******************************************************/
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/* whether we are suporting safe extensions           */
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/* as defined in PLCopen - Technical Committee 5      */
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/* Safety Software Technical Specification,           */
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/* Part 1: Concepts and Function Blocks,              */
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/* Version 1.0 – Official Release                     */
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/******************************************************/
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bool get_opt_safe_extensions();
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/************************************/
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/* whether to allow nested comments */
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/************************************/
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bool get_opt_nested_comments();
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/**************************************************************************/
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/* whether to allow REF(), DREF(), REF_TO, NULL and ^ operators/keywords  */
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/**************************************************************************/
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bool get_opt_ref_standard_extensions();
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/*************************************************************/
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/*************************************************************/
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/****                                                    *****/
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/****  I n t e r f a c e    B e t w e e n                *****/
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/****           F l e x    a n d     B i s o n           *****/
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/****                                                    *****/
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/*************************************************************/
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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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/* Ask flex to include the source code in the string */
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/*****************************************************/
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/* This is a service that flex provides to bison... */
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/* The string should contain valid IEC 61131-3 source code. Bison will ask flex to insert source 
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 * code into the input stream of IEC code being parsed. The code to be inserted is typically
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 * generated automatically.
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 * Currently this is used to insert conversion functions ***_TO_*** (as defined by the standard)
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 * between user defined (i.e. derived) enumerated datatypes, and some basic datatypes 
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 * (e.g. INT, STRING, etc...)
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 */
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void include_string(const char *source_code);
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/**********************************/
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/* Tell flex which file to parse. */
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/**********************************/
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/* This is a service that flex provides to bison... */
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/* Tell flex which file to parse. This function will not imediately start parsing the file.
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 * To parse the file, you then need to call yyparse()
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 *
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 * Returns NULL on error opening the file (and a valid errno), or 0 on success.
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 * Caller must close the file!
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 */
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FILE *parse_file(const char *filename);
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/**********************************************************************************************/
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/* whether bison is doing the pre-parsing, where POU bodies and var declarations are ignored! */
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/**********************************************************************************************/
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void set_preparse_state(void);
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void rst_preparse_state(void);
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bool get_preparse_state();  // returns true if bison is in preparse state
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/****************************************************/
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/* Controlling the entry to the body_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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/* Controlling the entry to the sfc_qualifier_state in flex. */
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/*************************************************************/
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void cmd_goto_sfc_qualifier_state(void);
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int  get_goto_sfc_qualifier_state(void);
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void rst_goto_sfc_qualifier_state(void);
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/*************************************************************/
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/* Controlling the entry to the sfc_priority_state in flex.  */
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/*************************************************************/
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void cmd_goto_sfc_priority_state(void);
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int  get_goto_sfc_priority_state(void);
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void rst_goto_sfc_priority_state(void);
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/*********************************************************/
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/* Controlling the entry to the task_init_state in flex. */
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/*********************************************************/
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void cmd_goto_task_init_state(void);
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int  get_goto_task_init_state(void);
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void rst_goto_task_init_state(void);
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/****************************************************************/
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/* Returning to state in flex previously pushed onto the stack. */
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/****************************************************************/
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void cmd_pop_state(void);
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int  get_pop_state(void);
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void rst_pop_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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 *       Bison accesses these data structures directly.
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 *
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 *       In essence, they are a data passing mechanism between Bison and Flex.
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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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typedef symtable_c<int>             library_element_symtable_t;
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extern  library_element_symtable_t  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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typedef symtable_c<int>             variable_name_symtable_t;
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extern  variable_name_symtable_t    variable_name_symtable;
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/* A symbol table to store the declared direct variables of
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 * the function currently being parsed...
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 */
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typedef symtable_c<int>             direct_variable_symtable_t;
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extern  direct_variable_symtable_t  direct_variable_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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/* Function only called from within flex!
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 *
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 * search for a symbol in direct variables symbol table
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 * declared above, and return the token id of the first
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 * symbol found.
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 */
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int get_direct_variable_token(const char *direct_variable_str);
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/*************************************************************/
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/*************************************************************/
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/****                                                    *****/
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/****  U t i l i t y   F u n c t i o n s ...             *****/
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/****                                                    *****/
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/****                                                    *****/
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/*************************************************************/
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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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