1

/*

     2

 * (c) 2007 Mario de Sousa

     3

 *

     4

 * Offered to the public under the terms of the GNU General Public License

     5

 * as published by the Free Software Foundation; either version 2 of the

     6

 * License, or (at your option) any later version.

     7

 *

     8

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

     9

 * WITHOUT ANY WARRANTY; without even the implied warranty of

    10

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General

    11

 * Public License for more details.

    12

 *

    13

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

    14

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

    15

 */

    16

    17

/*

    18

 * An IEC 61131-3 IL and ST compiler.

    19

 *

    20

 * Based on the

    21

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

    22

 *

    23

 */

    24

    25

    26

/*

    27

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

    28

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

    29

 */

    30

    31

    32

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

    33

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

    34

    35

    36

// #include "stage1_2.hh"

    37

#include "iec.y.hh"

    38

#include "stage1_2_priv.hh"

    39

    40

    41

    42

    43

    44

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

    45

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

    46

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

    47

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

    48

 * Note that flex accesses and updates this global variable

    49

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

    50

 * directive...

    51

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

    52

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

    53

 * file being parsed.

    54

 */

    55

const char *current_filename = NULL;

    56

    57

    58

    59

    60

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

    61

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

    62

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

    63

static int goto_body_state__ = 0;

    64

    65

void cmd_goto_body_state(void) {goto_body_state__ = 1;}

    66

int  get_goto_body_state(void) {return goto_body_state__;}

    67

void rst_goto_body_state(void) {goto_body_state__ = 0;}

    68

    69

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

    70

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

    71

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

    72

static int goto_sfc_qualifier_state__ = 0;

    73

    74

void cmd_goto_sfc_qualifier_state(void) {goto_sfc_qualifier_state__ = 1;}

    75

int  get_goto_sfc_qualifier_state(void) {return goto_sfc_qualifier_state__;}

    76

void rst_goto_sfc_qualifier_state(void) {goto_sfc_qualifier_state__ = 0;}

    77

    78

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

    79

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

    80

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

    81

static int goto_sfc_priority_state__ = 0;

    82

    83

void cmd_goto_sfc_priority_state(void) {goto_sfc_priority_state__ = 1;}

    84

int  get_goto_sfc_priority_state(void) {return goto_sfc_priority_state__;}

    85

void rst_goto_sfc_priority_state(void) {goto_sfc_priority_state__ = 0;}

    86

    87

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

    88

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

    89

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

    90

static int goto_task_init_state__ = 0;

    91

    92

void cmd_goto_task_init_state(void) {goto_task_init_state__ = 1;}

    93

int  get_goto_task_init_state(void) {return goto_task_init_state__;}

    94

void rst_goto_task_init_state(void) {goto_task_init_state__ = 0;}

    95

    96

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

    97

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

    98

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

    99

static int pop_state__ = 0;

   100

   101

void cmd_pop_state(void) {pop_state__ = 1;}

   102

int  get_pop_state(void) {return pop_state__;}

   103

void rst_pop_state(void) {pop_state__ = 0;}

   104

   105

   106

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

   107

/* The global symbol tables...   */

   108

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

   109

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

   110

 *       through the function get_identifier_token()

   111

 */

   112

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

   113

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

   114

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

   115

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

   116

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

   117

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

   118

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

   119

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

   120

 */ 

   121

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

   122

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

   123

 *       <fb_name , fb_decl>

   124

 *       <type_name , type_decl>

   125

 *       <program_name , program_decl>

   126

 *       <configuration_name , configuration_decl>

   127

 */

   128

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

   129

   130

/* A symbol table to store the declared variables of

   131

 * the function currently being parsed...

   132

 */

   133

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

   134

   135

   136

/* Function only called from within flex!

   137

 *

   138

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

   139

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

   140

 * symbol found.

   141

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

   142

 * does it continue searching in the library elements

   143

 */

   144

int get_identifier_token(const char *identifier_str) {

   145

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

   146

  int token_id;

   147

   148

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

   149

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

   150

      return identifier_token;

   151

  return token_id;

   152

}

   153

   154

   155

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

   156

/* Utility Functions... */

   157

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

   158

   159

/*

   160

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

   161

 */

   162

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

   163

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

   164

   165

  if (!res)

   166

    return NULL;

   167

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

   168

}

   169

   170

/*

   171

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

   172

 */

   173

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

   174

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

   175

   176

  if (!res)

   177

    return NULL;

   178

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

   179

}

   180

   181

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

   182

/* Tracking Functions... */

   183

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

   184

   185

extern tracking_t* current_tracking;

   186

   187

/*--------------------------------------------------------------------

   188

 * GetNextChar

   189

 * 

   190

 * reads a character from input for flex

   191

 *------------------------------------------------------------------*/

   192

int GetNextChar(char *b, int maxBuffer) {

   193

  char *p;

   194

   195

  if (  current_tracking->eof  )

   196

    return 0;

   197

   198

  while (  current_tracking->currentChar >= current_tracking->lineLength  ) {

   199

    current_tracking->currentChar = 0;

   200

    current_tracking->currentTokenStart = 1;

   201

    current_tracking->eof = false;

   202

   203

    p = fgets(current_tracking->buffer, MAX_BUFFER_LENGTH, current_tracking->in_file);

   204

    if (  p == NULL  ) {

   205

      if (  ferror(current_tracking->in_file)  )

   206

        return 0;

   207

      current_tracking->eof = true;

   208

      return 0;

   209

    }

   210

   211

    current_tracking->lineNumber++;

   212

    current_tracking->lineLength = strlen(current_tracking->buffer);

   213

  }

   214

   215

  b[0] = current_tracking->buffer[current_tracking->currentChar];

   216

  if (b[0] == ' ' || b[0] == '\t')

   217

    current_tracking->currentTokenStart++;

   218

  current_tracking->currentChar++;

   219

   220

  return b[0]==0?0:1;

   221

}

   222

   223

tracking_t* GetNewTracking(FILE* in_file) {

   224

  tracking_t* new_env = new tracking_t;

   225

  new_env->eof = 0;

   226

  new_env->lineNumber = 0;

   227

  new_env->currentChar = 0;

   228

  new_env->lineLength = 0;

   229

  new_env->currentTokenStart = 0;

   230

  new_env->buffer = (char*)malloc(MAX_BUFFER_LENGTH);

   231

  new_env->in_file = in_file;

   232

  return new_env;

   233

}

   234

   235

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

   236

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

   237

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

   238

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

   239

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

   240

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

   241

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

   242

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

   243

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

   244

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

   245

   246

   247

int stage1_2__(const char *filename, const char *includedir, symbol_c **tree_root_ref, bool full);

   248

   249

   250

int stage1_2(const char *filename, const char *includedir, symbol_c **tree_root_ref, bool full) {

   251

  return stage1_2__(filename, includedir, tree_root_ref, full);

   252

}

   253