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_bison.h !!

    44

 *

    45

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

    46

 *       include iec_bison.h 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

/* whether to allow nested comments */

    93

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

    94

bool get_opt_nested_comments();

    95

    96

    97

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

    98

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

    99

/****                                                    *****/

   100

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

   101

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

   102

/****                                                    *****/

   103

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

   104

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

   105

   106

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

   107

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

   108

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

   109

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

   110

void print_include_stack(void);

   111

   112

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

   113

/* Ask flex to include the source code in the string */

   114

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

   115

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

   116

/* The string should contain valid IEC 61131-3 source code. Bison will ask flex to insert source 

   117

 * code into the input stream of IEC code being parsed. The code to be inserted is typically

   118

 * generated automatically.

   119

 * Currently this is used to insert conversion functions ***_TO_*** (as defined by the standard)

   120

 * between user defined (i.e. derived) enumerated datatypes, and some basic datatypes 

   121

 * (e.g. INT, STRING, etc...)

   122

 */

   123

void include_string(const char *source_code);

   124

   125

   126

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

   127

/* Tell flex which file to parse. */

   128

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

   129

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

   130

/* Tell flex which file to parse. This function will not imediately start parsing the file.

   131

 * To parse the file, you then need to call yyparse()

   132

 *

   133

 * Returns NULL on error opening the file (and a valid errno), or 0 on success.

   134

 * Caller must close the file!

   135

 */

   136

FILE *parse_file(const char *filename);

   137

   138

   139

   140

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

   141

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

   142

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

   143

void cmd_goto_body_state(void);

   144

int  get_goto_body_state(void);

   145

void rst_goto_body_state(void);

   146

   147

   148

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

   149

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

   150

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

   151

void cmd_goto_sfc_qualifier_state(void);

   152

int  get_goto_sfc_qualifier_state(void);

   153

void rst_goto_sfc_qualifier_state(void);

   154

   155

   156

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

   157

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

   158

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

   159

void cmd_goto_sfc_priority_state(void);

   160

int  get_goto_sfc_priority_state(void);

   161

void rst_goto_sfc_priority_state(void);

   162

   163

   164

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

   165

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

   166

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

   167

void cmd_goto_task_init_state(void);

   168

int  get_goto_task_init_state(void);

   169

void rst_goto_task_init_state(void);

   170

   171

   172

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

   173

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

   174

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

   175

void cmd_pop_state(void);

   176

int  get_pop_state(void);

   177

void rst_pop_state(void);

   178

   179

   180

   181

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

   182

/* The global symbol tables...   */

   183

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

   184

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

   185

 *       through the function get_identifier_token()

   186

 *

   187

 *       Bison accesses these data structures directly.

   188

 *

   189

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

   190

 */

   191

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

   192

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

   193

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

   194

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

   195

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

   196

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

   197

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

   198

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

   199

 */ 

   200

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

   201

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

   202

 *       <fb_name , fb_decl>

   203

 *       <type_name , type_decl>

   204

 *       <program_name , program_decl>

   205

 *       <configuration_name , configuration_decl>

   206

 */

   207

extern symtable_c<int, BOGUS_TOKEN_ID> library_element_symtable;

   208

   209

/* A symbol table to store the declared variables of

   210

 * the function currently being parsed...

   211

 */

   212

extern symtable_c<int, BOGUS_TOKEN_ID> variable_name_symtable;

   213

   214

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

   215

 * the function currently being parsed...

   216

 */

   217

extern symtable_c<int, BOGUS_TOKEN_ID> direct_variable_symtable;

   218

   219

/* Function only called from within flex!

   220

 *

   221

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

   222

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

   223

 * symbol found.

   224

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

   225

 * does it continue searching in the library elements

   226

 */

   227

int get_identifier_token(const char *identifier_str);

   228

   229

/* Function only called from within flex!

   230

 *

   231

 * search for a symbol in direct variables symbol table

   232

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

   233

 * symbol found.

   234

 */

   235

int get_direct_variable_token(const char *direct_variable_str);

   236

   237

   238

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

   239

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

   240

/****                                                    *****/

   241

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

   242

/****                                                    *****/

   243

/****                                                    *****/

   244

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

   245

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

   246

   247

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

   248

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

   249

   250

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

   251

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

   252

   253

   254