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

 * The private interface to stage1_2.cc 

    36

 */

    37

    38

    39

    40

/* !!! WARNING !!!

    41

 *

    42

 *       Whoever includes this file (stage1_2_priv.hh) will need

    43

 *       to first inlcude iec.y.hh !!

    44

 *

    45

 *       Read other comments further down to understand why we don't

    46

 *       include iec.y.hh in this file.

    47

 */

    48

    49

    50

    51

/* file with the declarations of symbol tables... */

    52

#include "../util/symtable.hh"

    53

#include "stage1_2.hh"

    54

    55

    56

/*

    57

 * This file includes the interface through which the lexical parser (stage 1 - flex)

    58

 * and the syntax analyser (stage 2 - bison) interact between themselves.

    59

 *

    60

 * This is mostly through direct access to shared global variables, however some

    61

 * of the global variables will only be accessed through some accessor functions.

    62

 *

    63

 * This file also includes the interface between the main stage1_2() functions and 

    64

 * the flex lexical parser.

    65

 *

    66

 * This file also includes some utility functions (strdupX() ) that are both used

    67

 * in the lexical and syntax analysers.

    68

 */

    69

    70

    71

    72

    73

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

    74

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

    75

/****                                                    *****/

    76

/****  I n t e r f a c e    B e t w e e n                *****/

    77

/****           F l e x    a n d     s t a g e 1 _ 2 ()  *****/

    78

/****                                                    *****/

    79

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

    80

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

    81

    82

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

    83

/* whether we are suporting safe extensions           */

    84

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

    85

/* Safety Software Technical Specification,           */

    86

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

    87

/* Version 1.0 – Official Release                     */

    88

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

    89

bool get_opt_safe_extensions();

    90

    91

    92

    93

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

    94

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

    95

/****                                                    *****/

    96

/****  I n t e r f a c e    B e t w e e n                *****/

    97

/****           F l e x    a n d     B i s o n           *****/

    98

/****                                                    *****/

    99

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

   100

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

   101

   102

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

   103

/* print the include file stack to stderr... */

   104

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

   105

/* This is a service that flex provides to bison... */

   106

void print_include_stack(void);

   107

   108

   109

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

   110

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

   111

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

   112

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

   113

 * Note that flex accesses and updates this global variable

   114

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

   115

 * directive...

   116

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

   117

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

   118

 * file being parsed.

   119

 */

   120

extern const char *current_filename;

   121

   122

   123

#define MAX_BUFFER_LENGTH 1000

   124

   125

typedef struct {

   126

    int eof;

   127

    int lineNumber;

   128

    int currentChar;

   129

    int lineLength;

   130

    int currentTokenStart;

   131

    char* buffer;

   132

    FILE *in_file;

   133

  } tracking_t;

   134

   135

int GetNextChar(char *b, int maxBuffer);

   136

tracking_t* GetNewTracking(FILE* in_file);

   137

   138

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

   139

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

   140

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

   141

void cmd_goto_body_state(void);

   142

int  get_goto_body_state(void);

   143

void rst_goto_body_state(void);

   144

   145

   146

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

   147

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

   148

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

   149

void cmd_goto_sfc_qualifier_state(void);

   150

int  get_goto_sfc_qualifier_state(void);

   151

void rst_goto_sfc_qualifier_state(void);

   152

   153

   154

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

   155

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

   156

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

   157

void cmd_goto_sfc_priority_state(void);

   158

int  get_goto_sfc_priority_state(void);

   159

void rst_goto_sfc_priority_state(void);

   160

   161

   162

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

   163

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

   164

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

   165

void cmd_goto_task_init_state(void);

   166

int  get_goto_task_init_state(void);

   167

void rst_goto_task_init_state(void);

   168

   169

   170

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

   171

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

   172

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

   173

void cmd_pop_state(void);

   174

int  get_pop_state(void);

   175

void rst_pop_state(void);

   176

   177

   178

   179

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

   180

/* The global symbol tables...   */

   181

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

   182

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

   183

 *       through the function get_identifier_token()

   184

 *

   185

 *       Bison accesses these data structures directly.

   186

 *

   187

 *       In essence, they are a data passing mechanism between Bison and Flex.

   188

 */

   189

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

   190

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

   191

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

   192

 *       because of the way bison ver. 2.3 is copying all declarations in the prologue

   193

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

   194

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

   195

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

   196

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

   197

 */ 

   198

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

   199

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

   200

 *       <fb_name , fb_decl>

   201

 *       <type_name , type_decl>

   202

 *       <program_name , program_decl>

   203

 *       <configuration_name , configuration_decl>

   204

 */

   205

extern symtable_c<int, BOGUS_TOKEN_ID> library_element_symtable;

   206

   207

/* A symbol table to store the declared variables of

   208

 * the function currently being parsed...

   209

 */

   210

extern symtable_c<int, BOGUS_TOKEN_ID> variable_name_symtable;

   211

   212

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

   213

 * the function currently being parsed...

   214

 */

   215

extern symtable_c<int, BOGUS_TOKEN_ID> direct_variable_symtable;

   216

   217

/* Function only called from within flex!

   218

 *

   219

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

   220

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

   221

 * symbol found.

   222

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

   223

 * does it continue searching in the library elements

   224

 */

   225

int get_identifier_token(const char *identifier_str);

   226

   227

/* Function only called from within flex!

   228

 *

   229

 * search for a symbol in direct variables symbol table

   230

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

   231

 * symbol found.

   232

 */

   233

int get_direct_variable_token(const char *direct_variable_str);

   234

   235

   236

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

   237

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

   238

/****                                                    *****/

   239

/****  U t i l i t y   F u n c t i o n s ...             *****/

   240

/****                                                    *****/

   241

/****                                                    *****/

   242

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

   243

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

   244

   245

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

   246

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

   247

   248

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

   249

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

   250

   251

   252