1

/*

     2

 *  matiec - a compiler for the programming languages defined in IEC 61131-3

     3

 *

     4

 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)

     5

 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant

     6

 *

     7

 *  This program is free software: you can redistribute it and/or modify

     8

 *  it under the terms of the GNU General Public License as published by

     9

 *  the Free Software Foundation, either version 3 of the License, or

    10

 *  (at your option) any later version.

    11

 *

    12

 *  This program is distributed in the hope that it will be useful,

    13

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

    14

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    15

 *  GNU General Public License for more details.

    16

 *

    17

 *  You should have received a copy of the GNU General Public License

    18

 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.

    19

 *

    20

 *

    21

 * This code is made available on the understanding that it will not be

    22

 * used in safety-critical situations without a full and competent review.

    23

 */

    24

    25

/*

    26

 * An IEC 61131-3 compiler.

    27

 *

    28

 * Based on the

    29

 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)

    30

 *

    31

 */

    32

    33

    34

/*

    35

 * This file contains the code that calls the stage 1 (lexical anayser) 

    36

 * and stage 2 (syntax parser) during the first pass.

    37

 */

    38

    39

#include <string.h>

    40

#include <stdlib.h>

    41

    42

/* file with declaration of absyntax classes... */

    43

#include "../absyntax/absyntax.hh"

    44

    45

    47

#include "stage1_2.hh"

    48

#include "iec_bison.hh"

    49

#include "stage1_2_priv.hh"

    50

#include "create_enumtype_conversion_functions.hh"

    51

    52

    53

    54

    55

    56

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

    57

/* whether we are supporting safe extensions          */

    58

/* as defined in PLCopen - Technical Committee 5      */

    59

/* Safety Software Technical Specification,           */

    60

/* Part 1: Concepts and Function Blocks,              */

    61

/* Version 1.0 – Official Release                   */

    62

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

    64

    65

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

    66

/* whether to allow nested comments */

    67

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

    69

    70

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

    71

/* whether to allow REF(), DREF(), REF_TO, NULL and ^ operators/keywords  */

    72

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

    74

    75

    76

    77

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

    78

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

    79

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

    80

static int goto_body_state__ = 0;

    81

    82

void cmd_goto_body_state(void) {goto_body_state__ = 1;}

    83

int  get_goto_body_state(void) {return goto_body_state__;}

    84

void rst_goto_body_state(void) {goto_body_state__ = 0;}

    85

    86

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

    87

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

    88

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

    89

static int goto_sfc_qualifier_state__ = 0;

    90

    91

void cmd_goto_sfc_qualifier_state(void) {goto_sfc_qualifier_state__ = 1;}

    92

int  get_goto_sfc_qualifier_state(void) {return goto_sfc_qualifier_state__;}

    93

void rst_goto_sfc_qualifier_state(void) {goto_sfc_qualifier_state__ = 0;}

    94

    95

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

    96

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

    97

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

    98

static int goto_sfc_priority_state__ = 0;

    99

   100

void cmd_goto_sfc_priority_state(void) {goto_sfc_priority_state__ = 1;}

   101

int  get_goto_sfc_priority_state(void) {return goto_sfc_priority_state__;}

   102

void rst_goto_sfc_priority_state(void) {goto_sfc_priority_state__ = 0;}

   103

   104

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

   105

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

   106

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

   107

static int goto_task_init_state__ = 0;

   108

   109

void cmd_goto_task_init_state(void) {goto_task_init_state__ = 1;}

   110

int  get_goto_task_init_state(void) {return goto_task_init_state__;}

   111

void rst_goto_task_init_state(void) {goto_task_init_state__ = 0;}

   112

   113

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

   114

/* Returning to state in flex previously pushed onto the stack. */

   115

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

   116

static int pop_state__ = 0;

   117

   118

void cmd_pop_state(void) {pop_state__ = 1;}

   119

int  get_pop_state(void) {return pop_state__;}

   120

void rst_pop_state(void) {pop_state__ = 0;}

   121

   122

   123

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

   124

/* The global symbol tables...   */

   125

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

   126

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

   127

 *       through the function get_identifier_token()

   128

 */

   129

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

   130

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

   131

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

   132

 *       because of the way bison ver. 3.2 is copying all declarations in the prologue

   133

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

   134

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

   135

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

   136

 *       to take care to first inlcude iec_bison.hh !!

   137

 */ 

   138

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

   139

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

   140

 *       <fb_name , fb_decl>

   141

 *       <type_name , type_decl>

   142

 *       <program_name , program_decl>

   143

 *       <configuration_name , configuration_decl>

   144

 */

   145

/* static */ symtable_c<int, BOGUS_TOKEN_ID> library_element_symtable;

   146

   147

/* A symbol table to store the declared variables of

   148

 * the function currently being parsed...

   149

 */

   150

/* static */ symtable_c<int, BOGUS_TOKEN_ID> variable_name_symtable;

   151

   152

/* A symbol table to store the declared direct variables of

   153

 * the function currently being parsed...

   154

 */

   155

/* static */ symtable_c<int, BOGUS_TOKEN_ID> direct_variable_symtable;

   156

   157

/* Function only called from within flex!

   158

 *

   159

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

   160

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

   161

 * symbol found.

   162

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

   163

 * does it continue searching in the library elements

   164

 */

   165

int get_identifier_token(const char *identifier_str) {

   166

//  std::cout << "get_identifier_token(" << identifier_str << "): \n";

   167

  int token_id;

   168

   169

  if ((token_id = variable_name_symtable.find_value(identifier_str)) == variable_name_symtable.end_value())

   170

    if ((token_id = library_element_symtable.find_value(identifier_str)) == library_element_symtable.end_value())

   171

      return identifier_token;

   172

  return token_id;

   173

}

   174

   175

/* Function only called from within flex!

   176

 *

   177

 * search for a symbol in direct variables symbol table

   178

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

   179

 * symbol found.

   180

 */

   181

int get_direct_variable_token(const char *direct_variable_str) {

   182

  int token_id;

   183

   184

  if ((token_id = direct_variable_symtable.find_value(direct_variable_str)) == direct_variable_symtable.end_value())

   185

    return direct_variable_token;

   186

  return token_id;

   187

}

   188

   189

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

   190

/* Utility Functions... */

   191

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

   192

   193

/*

   194

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

   195

 */

   196

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

   197

  char *res = (char *)malloc(strlen(a) + strlen(b) + 1);

   198

   199

  if (!res)

   200

    return NULL;

   201

  return strcat(strcpy(res, a), b);  /* safe, actually */

   202

}

   203

   204

/*

   205

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

   206

 */

   207

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

   208

  char *res = (char *)malloc(strlen(a) + strlen(b) + strlen(c) + 1);

   209

   210

  if (!res)

   211

    return NULL;

   212

  return strcat(strcat(strcpy(res, a), b), c);  /* safe, actually */

   213

}

   214

   215

   216

   217

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

   218

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

   219

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

   220

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

   221

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

   222

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

   223

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

   224

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

   225

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

   226

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

   227

   228

int stage2__(const char *filename, 

   230

            );

   231

   232

   234

      /* NOTE: we only call stage2 (bison - syntax analysis) directly, as stage 2 will itself call stage1 (flex - lexical analysis)

   235

       *       automatically as needed

   236

       */

   237

   238

      /* NOTE: Since we do not call stage1__ (flex) directly, we cannot directly pass any parameters to that function either.

   239

       *       In this case, we use callback functions, i.e. stage1__ (i.e. flex) will call functions defined in this file

   240

       *       whenever it needs info/parameters coming from stage1_2().

   241

       *       These callback functions will get their data from local (to this file) global variables...

   242

       *       We now set those variables...

   243

       */