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

/* Search in a VAR* END_VAR declaration for the delcration of the specified variable instance. 

    35

 * Will return:

    36

 *     - the declaration itself (get_decl() )

    37

 *     - the type of declaration in which the variable was declared (get_vartype() )

    38

 *

    39

 * The variable instance may NOT be a member of a structure of a memeber

    40

 * of a structure of an element of an array of ...

    41

 *

    42

 * For example, considering the following 'variables':

    43

 *    window.points[1].coordinate.x

    44

 *    window.points[1].colour

    45

 *    offset[99]

    46

 *

    47

 *   passing a reference to 'points', 'points[1]', 'points[1].colour', 'colour'

    48

 *    ARE NOT ALLOWED!

    49

 *

    50

 * This class must only be passed the name of the variable that will appear

    51

 * in the variable declaration. In the above examples, this would be

    52

 *   'window.points[1].coordinate.x'

    53

 *   'window.points[1].coordinate'

    54

 *   'window.points[1]'

    55

 *   'window'

    56

 *   'window.points[1].colour'

    57

 *   'offset'

    58

 *   'offset[99]'

    59

 *

    60

 *

    61

 */

    62

    63

/* Note: 

    64

 * Determining the declaration type of a specific variable instance (including

    65

 * function block instances) really means determining whether the variable was declared in a

    66

 *  VAR_INPUT

    67

 *  VAR_OUTPUT

    68

 *  VAR_IN_OUT

    69

 *  VAR

    70

 *  VAR_TEMP

    71

 *  VAR_EXTERNAL

    72

 *  VAR_GLOBAL

    73

 *  VAR <var_name> AT <location>   -> Located variable!

    74

 * 

    75

 */

    76

    77

/* Note:

    78

 *  The current_type_decl that this class returns may reference the

    79

 * name of a type, or the type declaration itself!

    80

 * For an example of the first, consider a variable declared as ...

    81

 * x : AAA;

    82

 * where the AAA type is previously declared as whatever.

    83

 * For an example of the second, consider a variable declared as ...

    84

 * x : array of int [10];  ---->  is allowed

    85

 *

    86

 * If it is the first, we will return a reference to the name, if the second

    87

 * we return a reference to the declaration!!

    88

 */

    89

    90

    91

class search_var_instance_decl_c: public search_visitor_c {

    92

    93

  private:

    94

    symbol_c *search_scope;

    95

    symbol_c *search_name;

    96

    symbol_c *current_type_decl;

    97

    98

    /* variable used to store the type of variable currently being processed... */

    99

    /* Will contain a single value of generate_c_vardecl_c::XXXX_vt */

   100

    unsigned int current_vartype;

   101

    unsigned int current_option;

   102

   103

  public:

   104

    search_var_instance_decl_c(symbol_c *search_scope);

   105

    symbol_c *get_decl(symbol_c *variable_instance_name);

   106

   107

    unsigned int get_vartype(symbol_c *variable_instance_name);

   108

    unsigned int get_option(symbol_c *variable_instance_name);

   109

   110

  public:

   111

   112

    /* the types of variables that need to be processed... */

   113

    static const unsigned int none_vt     = 0x0000;

   114

    static const unsigned int input_vt    = 0x0001;  // VAR_INPUT

   115

    static const unsigned int output_vt   = 0x0002;  // VAR_OUTPUT

   116

    static const unsigned int inoutput_vt = 0x0004;  // VAR_IN_OUT

   117

    static const unsigned int private_vt  = 0x0008;  // VAR

   118

    static const unsigned int temp_vt     = 0x0010;  // VAR_TEMP

   119

    static const unsigned int external_vt = 0x0020;  // VAR_EXTERNAL

   120

    static const unsigned int global_vt   = 0x0040;  // VAR_GLOBAL

   121

    static const unsigned int located_vt  = 0x0080;  // VAR <var_name> AT <location>

   122

   123

    static const unsigned int none_opt        = 0x0000;

   124

    static const unsigned int constant_opt    = 0x0001;

   125

    static const unsigned int retain_opt      = 0x0002;

   126

    static const unsigned int non_retain_opt  = 0x0003;

   127

   128

  private:

   129

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

   130

    /* B 0 - Programming Model */

   131

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

   132

    void *visit(library_c *symbol);

   133

   134

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

   135

    /* B 1.4.3 - Declaration & Initialisation */

   136

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

   137

   138

    /* edge -> The F_EDGE or R_EDGE directive */

   139

    // SYM_REF2(edge_declaration_c, edge, var1_list)

   140

    // TODO

   141

    void *visit(constant_option_c *symbol);

   142

    void *visit(retain_option_c *symbol);

   143

    void *visit(non_retain_option_c *symbol);

   144

   145

   146

    void *visit(input_declarations_c *symbol);

   147

    /* VAR_OUTPUT [RETAIN | NON_RETAIN] var_init_decl_list END_VAR */

   148

    /* option -> may be NULL ! */

   149

    void *visit(output_declarations_c *symbol);

   150

    /*  VAR_IN_OUT var_declaration_list END_VAR */

   151

    void *visit(input_output_declarations_c *symbol);

   152

    /* ENO : BOOL */

   153

    void *visit(eno_param_declaration_c *symbol);

   154

    /* VAR [CONSTANT] var_init_decl_list END_VAR */

   155

    /* option -> may be NULL ! */

   156

    /* helper symbol for input_declarations */

   157

    void *visit(var_declarations_c *symbol);

   158

    /*  VAR RETAIN var_init_decl_list END_VAR */

   159

    void *visit(retentive_var_declarations_c *symbol);

   160

    /*  VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */

   161

    /* option -> may be NULL ! */

   162

    //SYM_REF2(located_var_declarations_c, option, located_var_decl_list)

   163

    void *visit(located_var_declarations_c *symbol);

   164

    /*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */

   165

    /* option -> may be NULL ! */

   166

    //SYM_REF2(external_var_declarations_c, option, external_declaration_list)

   167

    void *visit(external_var_declarations_c *symbol);

   168

    /*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */

   169

    /* option -> may be NULL ! */

   170

    //SYM_REF2(global_var_declarations_c, option, global_var_decl_list)

   171

    void *visit(global_var_declarations_c *symbol);

   172

    /* var1_list is one of the following...

   173

     *    simple_spec_init_c *

   174

     *    subrange_spec_init_c *

   175

     *    enumerated_spec_init_c *

   176

     */

   177

    // SYM_REF2(var1_init_decl_c, var1_list, spec_init)

   178

    void *visit(var1_init_decl_c *symbol);

   179

    /* var1_list ',' variable_name */

   180

    // SYM_LIST(var1_list_c)

   181

    void *visit(var1_list_c *symbol);

   182

    /* name_list ':' function_block_type_name ASSIGN structure_initialization */

   183

    /* structure_initialization -> may be NULL ! */

   184

    void *visit(fb_name_decl_c *symbol);

   185

    /* name_list ',' fb_name */

   186

    void *visit(fb_name_list_c *symbol);

   187

    /* var1_list ':' array_spec_init */

   188

    // SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)

   189

    void *visit(array_var_init_decl_c *symbol);

   190

    /*  var1_list ':' initialized_structure */

   191

    // SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)

   192

    void *visit(structured_var_init_decl_c *symbol);

   193

    /*  var1_list ':' array_specification */

   194

    // SYM_REF2(array_var_declaration_c, var1_list, array_specification)

   195

    void *visit(array_var_declaration_c *symbol);

   196

    /*  var1_list ':' structure_type_name */

   197

    // SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)

   198

    void *visit(structured_var_declaration_c *symbol);

   199

    /*  [variable_name] location ':' located_var_spec_init */

   200

    /* variable_name -> may be NULL ! */

   201

    // SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)

   202

    // TODO!!

   203

   204

    /*  global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */

   205

    // SYM_REF2(external_declaration_c, global_var_name, specification)

   206

    void *visit(external_declaration_c *symbol);

   207

    /*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */

   208

    /* type_specification ->may be NULL ! */

   209

    // SYM_REF2(global_var_decl_c, global_var_spec, type_specification)

   210

    void *visit(global_var_decl_c *symbol);

   211

    /*| global_var_name location */

   212

    //SYM_REF2(global_var_spec_c, global_var_name, location)

   213

    void *visit(global_var_spec_c *symbol);

   214

    /*| global_var_list ',' global_var_name */

   215

    //SYM_LIST(global_var_list_c)

   216

    void *visit(global_var_list_c *symbol);

   217

    /*  [variable_name] location ':' located_var_spec_init */

   218

    /* variable_name -> may be NULL ! */

   219

    //SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)

   220

    void *visit(located_var_decl_c *symbol);

   221

    /*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */

   222

    /* type_specification ->may be NULL ! */

   223

    // SYM_REF2(global_var_decl_c, global_var_spec, type_specification)

   224

    // TODO!!

   225

    /*  AT direct_variable */

   226

    // SYM_REF2(location_c, direct_variable, unused)

   227

    void *visit(location_c *symbol);

   228

    /*| global_var_list ',' global_var_name */

   229

    // SYM_LIST(global_var_list_c)

   230

    // TODO!!

   231

    /*  var1_list ':' single_byte_string_spec */

   232

    // SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)

   233

    void *visit(single_byte_string_var_declaration_c *symbol);

   234

    /*  STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */

   235

    /* integer ->may be NULL ! */

   236

    /* single_byte_character_string ->may be NULL ! */

   237

    // SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)

   238

    // TODO!!

   239

   240

    /*  var1_list ':' double_byte_string_spec */

   241

    // SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)

   242

    void *visit(double_byte_string_var_declaration_c *symbol);

   243

    /*  WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */

   244

    /* integer ->may be NULL ! */

   245

    /* double_byte_character_string ->may be NULL ! */

   246

    // SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)

   247

    // TODO!!

   248

   249

    /*  variable_name incompl_location ':' var_spec */

   250

    // SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)

   251

    // TODO!!

   252

   253

    /*  AT incompl_location_token */

   254

    // SYM_TOKEN(incompl_location_c)

   255

    // TODO!!

   256

   257

   258

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

   259

    /* B.1.5 - Program organization units */

   260

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

   261

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

   262

    /* B 1.5.1 - Functions */

   263

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

   264

    // SYM_REF4(function_declaration_c, derived_function_name, type_name, var_declarations_list, function_body)

   265

    void *visit(function_declaration_c *symbol);

   266

   267

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

   268

    /* B 1.5.2 - Function Blocks */

   269

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

   270

    void *visit(function_block_declaration_c *symbol);

   271

   272

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

   273

    /* B 1.5.3 - Programs */

   274

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

   275

    void *visit(program_declaration_c *symbol);

   276

   277

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

   278

    /* B 1.7 Configuration elements */

   279

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

   280

   281

    /*

   282

    CONFIGURATION configuration_name

   283

       optional_global_var_declarations

   284

       (resource_declaration_list | single_resource_declaration)

   285

       optional_access_declarations

   286

       optional_instance_specific_initializations

   287

    END_CONFIGURATION

   288

    */

   289

    /*

   290

    SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)

   291

    */                                                                                                            

   292

    void *visit(configuration_declaration_c *symbol);

   293

    /*

   294

    RESOURCE resource_name ON resource_type_name

   295

       optional_global_var_declarations

   296

       single_resource_declaration

   297

    END_RESOURCE

   298

    */

   299

    // SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)

   300

    void *visit(resource_declaration_c *symbol);

   301

   302

    /* task_configuration_list program_configuration_list */

   303

    // SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)

   304

    void *visit(single_resource_declaration_c *symbol);

   305

   306

}; // search_var_instance_decl_c

   307