stage1_2/stage1_2.cc
author mjsousa
Wed, 17 Dec 2014 13:46:36 +0000
changeset 965 c9eeb67ba939
parent 952 e984cfdf3b10
child 971 8aee27d46208
permissions -rwxr-xr-x
Small code re-organization of how const values are stored in symbol_c (can now be accessed through member functions, instead of macros)
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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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 * This file contains the code that calls the stage 1 (lexical anayser) 
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 * and stage 2 (syntax parser) during the first pass.
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 */
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#include <string.h>
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#include <stdlib.h>
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/* file with declaration of absyntax classes... */
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#include "../absyntax/absyntax.hh"
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#include "../main.hh"
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#include "stage1_2.hh"
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#include "iec_bison.hh"
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#include "stage1_2_priv.hh"
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#include "create_enumtype_conversion_functions.hh"
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/******************************************************/
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/* whether we are supporting 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() {return runtime_options.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() {return runtime_options.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() {return runtime_options.ref_standard_extensions;}
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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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static bool preparse_state__ = false;
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void set_preparse_state(void) {preparse_state__ = true; }
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void rst_preparse_state(void) {preparse_state__ = false;}
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bool get_preparse_state(void) {return 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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static int goto_body_state__ = 0;
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void cmd_goto_body_state(void) {goto_body_state__ = 1;}
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int  get_goto_body_state(void) {return goto_body_state__;}
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void rst_goto_body_state(void) {goto_body_state__ = 0;}
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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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static int goto_sfc_qualifier_state__ = 0;
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void cmd_goto_sfc_qualifier_state(void) {goto_sfc_qualifier_state__ = 1;}
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int  get_goto_sfc_qualifier_state(void) {return goto_sfc_qualifier_state__;}
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void rst_goto_sfc_qualifier_state(void) {goto_sfc_qualifier_state__ = 0;}
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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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static int goto_sfc_priority_state__ = 0;
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void cmd_goto_sfc_priority_state(void) {goto_sfc_priority_state__ = 1;}
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int  get_goto_sfc_priority_state(void) {return goto_sfc_priority_state__;}
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void rst_goto_sfc_priority_state(void) {goto_sfc_priority_state__ = 0;}
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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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static int goto_task_init_state__ = 0;
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void cmd_goto_task_init_state(void) {goto_task_init_state__ = 1;}
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int  get_goto_task_init_state(void) {return goto_task_init_state__;}
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void rst_goto_task_init_state(void) {goto_task_init_state__ = 0;}
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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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static int pop_state__ = 0;
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void cmd_pop_state(void) {pop_state__ = 1;}
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int  get_pop_state(void) {return pop_state__;}
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void rst_pop_state(void) {pop_state__ = 0;}
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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_bison.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_bison.hh" in this file (stage1_2_priv.hh) directly
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 *       because of the way bison ver. 3.2 is copying all declarations in the prologue
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 *       of iec.y to the iec_bison.hh file (including an #include stage1_2_priv.hh).
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 *       So, if we were to include "iec_bison.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_bison.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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/* static */ 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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/* static */ symtable_c<int, BOGUS_TOKEN_ID> 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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/* static */ symtable_c<int, BOGUS_TOKEN_ID> 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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//  std::cout << "get_identifier_token(" << identifier_str << "): \n";
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  int token_id;
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  if ((token_id = variable_name_symtable.find_value(identifier_str)) == variable_name_symtable.end_value())
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    if ((token_id = library_element_symtable.find_value(identifier_str)) == library_element_symtable.end_value())
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      return identifier_token;
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  return token_id;
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}
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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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  int token_id;
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  if ((token_id = direct_variable_symtable.find_value(direct_variable_str)) == direct_variable_symtable.end_value())
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    return direct_variable_token;
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  return token_id;
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}
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/************************/
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/* Utility Functions... */
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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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 */
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char *strdup2(const char *a, const char *b) {
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  char *res = (char *)malloc(strlen(a) + strlen(b) + 1);
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  if (!res)
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    return NULL;
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  return strcat(strcpy(res, a), b);  /* safe, actually */
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}
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/*
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 * Join three strings together. Allocate space with malloc(3).
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 */
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char *strdup3(const char *a, const char *b, const char *c) {
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  char *res = (char *)malloc(strlen(a) + strlen(b) + strlen(c) + 1);
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  if (!res)
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    return NULL;
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  return strcat(strcat(strcpy(res, a), b), c);  /* safe, actually */
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}
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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int stage2__(const char *filename, 
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             symbol_c **tree_root_ref
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            );
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int stage1_2(const char *filename, symbol_c **tree_root_ref) {
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      /* NOTE: we only call stage2 (bison - syntax analysis) directly, as stage 2 will itself call stage1 (flex - lexical analysis)
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       *       automatically as needed
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       */
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      /* NOTE: Since we do not call stage1__ (flex) directly, we cannot directly pass any parameters to that function either.
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       *       In this case, we use callback functions, i.e. stage1__ (i.e. flex) will call functions defined in this file
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       *       whenever it needs info/parameters coming from stage1_2().
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       *       These callback functions will get their data from local (to this file) global variables...
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       *       We now set those variables...
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       */
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  return stage2__(filename, tree_root_ref);
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}
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