src/mesa/shader/slang/library/slang_shader.syn

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 2004-2006  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /*
  26  * \file slang_shader.syn
  27  * slang vertex/fragment shader syntax
  28  * \author Michal Krol
  29  */
  30
  31 /*
  32  * usage:
  33  *   syn2c slang_shader.syn > slang_shader_syn.h
  34  *
  35  * when modifying or extending this file, several things must be taken into
  36  * consideration:
  37  *
  38  * - when adding new operators that were marked as reserved in the
  39  *   initial specification, one must only uncomment particular lines of
  40  *   code that refer to operators being added;
  41  *
  42  * - when adding new shader targets, one must reserve a new value for
  43  *   shader_type register and use it in .if constructs for symbols that
  44  *   are exclusive for that shader;
  45  *
  46  * - some symbols mimic output of other symbols - the best example is
  47  *   the "for" construct: expression "for (foo(); ; bar())" is seen as
  48  *   "for (foo(); true; bar())" by the output processor - hence, special
  49  *   care must be taken when rearranging output of essential symbols;
  50  *
  51  * - order of single-quoted tokens does matter in alternatives - so do not
  52  *   parse "<" operator before "<<" and "<<" before "<<=";
  53  *
  54  * - all double-quoted tokens are internally preprocessed to eliminate
  55  *   problems with parsing strings that are prefixes of other strings,
  56  *   like "sampler1D" and "sampler1DShadow";
  57  */
  58
  59 .syntax translation_unit;
  60
  61 /* revision number - increment after each change affecting emitted output */
  62 .emtcode REVISION                                   4
  63
  64 /* external declaration (or precision or invariant stmt) */
  65 .emtcode EXTERNAL_NULL                              0
  66 .emtcode EXTERNAL_FUNCTION_DEFINITION               1
  67 .emtcode EXTERNAL_DECLARATION                       2
  68 .emtcode DEFAULT_PRECISION                          3
  69 .emtcode INVARIANT_STMT                             4
  70
  71 /* precision */
  72 .emtcode PRECISION_DEFAULT                          0
  73 .emtcode PRECISION_LOW                              1
  74 .emtcode PRECISION_MEDIUM                           2
  75 .emtcode PRECISION_HIGH                             3
  76
  77 /* declaration */
  78 .emtcode DECLARATION_FUNCTION_PROTOTYPE             1
  79 .emtcode DECLARATION_INIT_DECLARATOR_LIST           2
  80
  81 /* function type */
  82 .emtcode FUNCTION_ORDINARY                          0
  83 .emtcode FUNCTION_CONSTRUCTOR                       1
  84 .emtcode FUNCTION_OPERATOR                          2
  85
  86 /* operator type */
  87 .emtcode OPERATOR_ADDASSIGN                         1
  88 .emtcode OPERATOR_SUBASSIGN                         2
  89 .emtcode OPERATOR_MULASSIGN                         3
  90 .emtcode OPERATOR_DIVASSIGN                         4
  91 /*.emtcode OPERATOR_MODASSIGN                         5*/
  92 /*.emtcode OPERATOR_LSHASSIGN                         6*/
  93 /*.emtcode OPERATOR_RSHASSIGN                         7*/
  94 /*.emtcode OPERATOR_ORASSIGN                          8*/
  95 /*.emtcode OPERATOR_XORASSIGN                         9*/
  96 /*.emtcode OPERATOR_ANDASSIGN                         10*/
  97 .emtcode OPERATOR_LOGICALXOR                        11
  98 /*.emtcode OPERATOR_BITOR                             12*/
  99 /*.emtcode OPERATOR_BITXOR                            13*/
 100 /*.emtcode OPERATOR_BITAND                            14*/
 101 .emtcode OPERATOR_LESS                              15
 102 .emtcode OPERATOR_GREATER                           16
 103 .emtcode OPERATOR_LESSEQUAL                         17
 104 .emtcode OPERATOR_GREATEREQUAL                      18
 105 /*.emtcode OPERATOR_LSHIFT                            19*/
 106 /*.emtcode OPERATOR_RSHIFT                            20*/
 107 .emtcode OPERATOR_MULTIPLY                          21
 108 .emtcode OPERATOR_DIVIDE                            22
 109 /*.emtcode OPERATOR_MODULUS                           23*/
 110 .emtcode OPERATOR_INCREMENT                         24
 111 .emtcode OPERATOR_DECREMENT                         25
 112 .emtcode OPERATOR_PLUS                              26
 113 .emtcode OPERATOR_MINUS                             27
 114 /*.emtcode OPERATOR_COMPLEMENT                        28*/
 115 .emtcode OPERATOR_NOT                               29
 116
 117 /* init declarator list */
 118 .emtcode DECLARATOR_NONE                            0
 119 .emtcode DECLARATOR_NEXT                            1
 120
 121 /* variable declaration */
 122 .emtcode VARIABLE_NONE                              0
 123 .emtcode VARIABLE_IDENTIFIER                        1
 124 .emtcode VARIABLE_INITIALIZER                       2
 125 .emtcode VARIABLE_ARRAY_EXPLICIT                    3
 126 .emtcode VARIABLE_ARRAY_UNKNOWN                     4
 127
 128 /* type qualifier */
 129 .emtcode TYPE_QUALIFIER_NONE                        0
 130 .emtcode TYPE_QUALIFIER_CONST                       1
 131 .emtcode TYPE_QUALIFIER_ATTRIBUTE                   2
 132 .emtcode TYPE_QUALIFIER_VARYING                     3
 133 .emtcode TYPE_QUALIFIER_UNIFORM                     4
 134 .emtcode TYPE_QUALIFIER_FIXEDOUTPUT                 5
 135 .emtcode TYPE_QUALIFIER_FIXEDINPUT                  6
 136
 137 /* invariant qualifier */
 138 .emtcode TYPE_VARIANT                               90
 139 .emtcode TYPE_INVARIANT                             91
 140
 141 /* centroid qualifier */
 142 .emtcode TYPE_CENTER                                95
 143 .emtcode TYPE_CENTROID                              96
 144
 145 /* type specifier */
 146 .emtcode TYPE_SPECIFIER_VOID                        0
 147 .emtcode TYPE_SPECIFIER_BOOL                        1
 148 .emtcode TYPE_SPECIFIER_BVEC2                       2
 149 .emtcode TYPE_SPECIFIER_BVEC3                       3
 150 .emtcode TYPE_SPECIFIER_BVEC4                       4
 151 .emtcode TYPE_SPECIFIER_INT                         5
 152 .emtcode TYPE_SPECIFIER_IVEC2                       6
 153 .emtcode TYPE_SPECIFIER_IVEC3                       7
 154 .emtcode TYPE_SPECIFIER_IVEC4                       8
 155 .emtcode TYPE_SPECIFIER_FLOAT                       9
 156 .emtcode TYPE_SPECIFIER_VEC2                        10
 157 .emtcode TYPE_SPECIFIER_VEC3                        11
 158 .emtcode TYPE_SPECIFIER_VEC4                        12
 159 .emtcode TYPE_SPECIFIER_MAT2                        13
 160 .emtcode TYPE_SPECIFIER_MAT3                        14
 161 .emtcode TYPE_SPECIFIER_MAT4                        15
 162 .emtcode TYPE_SPECIFIER_SAMPLER1D                   16
 163 .emtcode TYPE_SPECIFIER_SAMPLER2D                   17
 164 .emtcode TYPE_SPECIFIER_SAMPLER3D                   18
 165 .emtcode TYPE_SPECIFIER_SAMPLERCUBE                 19
 166 .emtcode TYPE_SPECIFIER_SAMPLER1DSHADOW             20
 167 .emtcode TYPE_SPECIFIER_SAMPLER2DSHADOW             21
 168 .emtcode TYPE_SPECIFIER_SAMPLER2DRECT               22
 169 .emtcode TYPE_SPECIFIER_SAMPLER2DRECTSHADOW         23
 170 .emtcode TYPE_SPECIFIER_STRUCT                      24
 171 .emtcode TYPE_SPECIFIER_TYPENAME                    25
 172
 173 /* OpenGL 2.1 */
 174 .emtcode TYPE_SPECIFIER_MAT23                       26
 175 .emtcode TYPE_SPECIFIER_MAT32                       27
 176 .emtcode TYPE_SPECIFIER_MAT24                       28
 177 .emtcode TYPE_SPECIFIER_MAT42                       29
 178 .emtcode TYPE_SPECIFIER_MAT34                       30
 179 .emtcode TYPE_SPECIFIER_MAT43                       31
 180
 181
 182 /* structure field */
 183 .emtcode FIELD_NONE                                 0
 184 .emtcode FIELD_NEXT                                 1
 185 .emtcode FIELD_ARRAY                                2
 186
 187 /* operation */
 188 .emtcode OP_END                                     0
 189 .emtcode OP_BLOCK_BEGIN_NO_NEW_SCOPE                1
 190 .emtcode OP_BLOCK_BEGIN_NEW_SCOPE                   2
 191 .emtcode OP_DECLARE                                 3
 192 .emtcode OP_ASM                                     4
 193 .emtcode OP_BREAK                                   5
 194 .emtcode OP_CONTINUE                                6
 195 .emtcode OP_DISCARD                                 7
 196 .emtcode OP_RETURN                                  8
 197 .emtcode OP_EXPRESSION                              9
 198 .emtcode OP_IF                                      10
 199 .emtcode OP_WHILE                                   11
 200 .emtcode OP_DO                                      12
 201 .emtcode OP_FOR                                     13
 202 .emtcode OP_PUSH_VOID                               14
 203 .emtcode OP_PUSH_BOOL                               15
 204 .emtcode OP_PUSH_INT                                16
 205 .emtcode OP_PUSH_FLOAT                              17
 206 .emtcode OP_PUSH_IDENTIFIER                         18
 207 .emtcode OP_SEQUENCE                                19
 208 .emtcode OP_ASSIGN                                  20
 209 .emtcode OP_ADDASSIGN                               21
 210 .emtcode OP_SUBASSIGN                               22
 211 .emtcode OP_MULASSIGN                               23
 212 .emtcode OP_DIVASSIGN                               24
 213 /*.emtcode OP_MODASSIGN                               25*/
 214 /*.emtcode OP_LSHASSIGN                               26*/
 215 /*.emtcode OP_RSHASSIGN                               27*/
 216 /*.emtcode OP_ORASSIGN                                28*/
 217 /*.emtcode OP_XORASSIGN                               29*/
 218 /*.emtcode OP_ANDASSIGN                               30*/
 219 .emtcode OP_SELECT                                  31
 220 .emtcode OP_LOGICALOR                               32
 221 .emtcode OP_LOGICALXOR                              33
 222 .emtcode OP_LOGICALAND                              34
 223 /*.emtcode OP_BITOR                                   35*/
 224 /*.emtcode OP_BITXOR                                  36*/
 225 /*.emtcode OP_BITAND                                  37*/
 226 .emtcode OP_EQUAL                                   38
 227 .emtcode OP_NOTEQUAL                                39
 228 .emtcode OP_LESS                                    40
 229 .emtcode OP_GREATER                                 41
 230 .emtcode OP_LESSEQUAL                               42
 231 .emtcode OP_GREATEREQUAL                            43
 232 /*.emtcode OP_LSHIFT                                  44*/
 233 /*.emtcode OP_RSHIFT                                  45*/
 234 .emtcode OP_ADD                                     46
 235 .emtcode OP_SUBTRACT                                47
 236 .emtcode OP_MULTIPLY                                48
 237 .emtcode OP_DIVIDE                                  49
 238 /*.emtcode OP_MODULUS                                 50*/
 239 .emtcode OP_PREINCREMENT                            51
 240 .emtcode OP_PREDECREMENT                            52
 241 .emtcode OP_PLUS                                    53
 242 .emtcode OP_MINUS                                   54
 243 /*.emtcode OP_COMPLEMENT                              55*/
 244 .emtcode OP_NOT                                     56
 245 .emtcode OP_SUBSCRIPT                               57
 246 .emtcode OP_CALL                                    58
 247 .emtcode OP_FIELD                                   59
 248 .emtcode OP_POSTINCREMENT                           60
 249 .emtcode OP_POSTDECREMENT                           61
 250 .emtcode OP_PRECISION                               62
 251
 252 /* parameter qualifier */
 253 .emtcode PARAM_QUALIFIER_IN                         0
 254 .emtcode PARAM_QUALIFIER_OUT                        1
 255 .emtcode PARAM_QUALIFIER_INOUT                      2
 256
 257 /* function parameter */
 258 .emtcode PARAMETER_NONE                             0
 259 .emtcode PARAMETER_NEXT                             1
 260
 261 /* function parameter array presence */
 262 .emtcode PARAMETER_ARRAY_NOT_PRESENT                0
 263 .emtcode PARAMETER_ARRAY_PRESENT                    1
 264
 265 /* INVALID_EXTERNAL_DECLARATION seems to be reported when there's */
 266 /* any syntax errors... */
 267 .errtext INVALID_EXTERNAL_DECLARATION               "2001: Syntax error."
 268 .errtext INVALID_OPERATOR_OVERRIDE                  "2002: Invalid operator override."
 269 .errtext LBRACE_EXPECTED                            "2003: '{' expected but '$err_token$' found."
 270 .errtext LPAREN_EXPECTED                            "2004: '(' expected but '$err_token$' found."
 271 .errtext RPAREN_EXPECTED                            "2005: ')' expected but '$err_token$' found."
 272 .errtext INVALID_PRECISION                          "2006: Invalid precision specifier '$err_token$'."
 273 .errtext INVALID_PRECISION_TYPE                     "2007: Invalid precision type '$err_token$'."
 274
 275
 276 /*
 277  * tells whether the shader that is being parsed is a built-in shader or not
 278  *  0 - normal behaviour
 279  *  1 - accepts constructor and operator definitions and __asm statements
 280  * the implementation will set it to 1 when compiling internal built-in shaders
 281  */
 282 .regbyte parsing_builtin                            0
 283
 284 /*
 285  * holds the type of the shader being parsed; possible values are
 286  * listed below.
 287  *   FRAGMENT_SHADER            1
 288  *   VERTEX_SHADER              2
 289  * shader type is set by the caller before parsing
 290  */
 291 .regbyte shader_type                                0
 292
 293 /*
 294  * <variable_identifier> ::= <identifier>
 295  */
 296 variable_identifier
 297     identifier .emit OP_PUSH_IDENTIFIER;
 298
 299 /*
 300  *  <primary_expression> ::= <variable_identifier>
 301  *                         | <intconstant>
 302  *                         | <floatconstant>
 303  *                         | <boolconstant>
 304  *                         | "(" <expression> ")"
 305  */
 306 primary_expression
 307     floatconstant .or boolconstant .or intconstant .or variable_identifier .or primary_expression_1;
 308 primary_expression_1
 309     lparen .and expression .and rparen;
 310
 311 /*
 312  * <postfix_expression> ::= <primary_expression>
 313  *                        | <postfix_expression> "[" <integer_expression> "]"
 314  *                        | <function_call>
 315  *                        | <postfix_expression> "." <field_selection>
 316  *                        | <postfix_expression> "++"
 317  *                        | <postfix_expression> "--"
 318  */
 319 postfix_expression
 320     postfix_expression_1 .and .loop postfix_expression_2;
 321 postfix_expression_1
 322     function_call .or primary_expression;
 323 postfix_expression_2
 324     postfix_expression_3 .or postfix_expression_4 .or
 325     plusplus .emit OP_POSTINCREMENT .or
 326     minusminus .emit OP_POSTDECREMENT;
 327 postfix_expression_3
 328     lbracket .and integer_expression .and rbracket .emit OP_SUBSCRIPT;
 329 postfix_expression_4
 330     dot .and field_selection .emit OP_FIELD;
 331
 332 /*
 333  * <integer_expression> ::= <expression>
 334  */
 335 integer_expression
 336     expression;
 337
 338 /*
 339  * <function_call> ::= <function_call_generic>
 340  */
 341 function_call
 342     function_call_generic .emit OP_CALL .and .true .emit OP_END;
 343
 344 /*
 345  * <function_call_generic> ::= <function_call_header_with_parameters> ")"
 346  *                           | <function_call_header_no_parameters> ")"
 347  */
 348 function_call_generic
 349     function_call_generic_1 .or function_call_generic_2;
 350 function_call_generic_1
 351     function_call_header_with_parameters .and rparen .error RPAREN_EXPECTED;
 352 function_call_generic_2
 353     function_call_header_no_parameters .and rparen .error RPAREN_EXPECTED;
 354
 355 /*
 356  * <function_call_header_no_parameters>::= <function_call_header> "void"
 357  *                                        | <function_call_header>
 358  */
 359 function_call_header_no_parameters
 360     function_call_header .and function_call_header_no_parameters_1;
 361 function_call_header_no_parameters_1
 362     "void" .or .true;
 363
 364 /*
 365  * <function_call_header_with_parameters> ::= <function_call_header> <assignment_expression>
 366  *                                          | <function_call_header_with_parameters> "," <assignment_expression>
 367  */
 368 function_call_header_with_parameters
 369     function_call_header .and assignment_expression .and .true .emit OP_END .and
 370     .loop function_call_header_with_parameters_1;
 371 function_call_header_with_parameters_1
 372     comma .and assignment_expression .and .true .emit OP_END;
 373
 374 /*
 375  * <function_call_header> ::= <function_identifier> "("
 376  */
 377 function_call_header
 378     function_identifier .and lparen;
 379
 380 /*
 381  * <function_identifier> ::= <constructor_identifier>
 382  *                         | <identifier>
 383  *
 384  * note: <constructor_identifier> has been deleted
 385  */
 386 function_identifier
 387     identifier;
 388
 389 /*
 390  * <unary_expression> ::= <postfix_expression>
 391  *                      | "++" <unary_expression>
 392  *                      | "--" <unary_expression>
 393  *                      | <unary_operator> <unary_expression>
 394  *
 395  * <unary_operator>   ::= "+"
 396  *                      | "-"
 397  *                      | "!"
 398  *                      | "~" // reserved
 399  */
 400 unary_expression
 401     postfix_expression .or unary_expression_1 .or unary_expression_2 .or unary_expression_3 .or
 402     unary_expression_4 .or unary_expression_5/* .or unary_expression_6*/;
 403 unary_expression_1
 404     plusplus .and unary_expression .and .true .emit OP_PREINCREMENT;
 405 unary_expression_2
 406     minusminus .and unary_expression .and .true .emit OP_PREDECREMENT;
 407 unary_expression_3
 408     plus .and unary_expression .and .true .emit OP_PLUS;
 409 unary_expression_4
 410     minus .and unary_expression .and .true .emit OP_MINUS;
 411 unary_expression_5
 412     bang .and unary_expression .and .true .emit OP_NOT;
 413 /*unary_expression_6
 414     tilde .and unary_expression .and .true .emit OP_COMPLEMENT;*/
 415
 416 /*
 417  * <multiplicative_expression> ::= <unary_expression>
 418  *                               | <multiplicative_expression> "*" <unary_expression>
 419  *                               | <multiplicative_expression> "/" <unary_expression>
 420  *                               | <multiplicative_expression> "%" <unary_expression> // reserved
 421  */
 422 multiplicative_expression
 423     unary_expression .and .loop multiplicative_expression_1;
 424 multiplicative_expression_1
 425     multiplicative_expression_2 .or multiplicative_expression_3/* .or multiplicative_expression_4*/;
 426 multiplicative_expression_2
 427     star .and unary_expression .and .true .emit OP_MULTIPLY;
 428 multiplicative_expression_3
 429     slash .and unary_expression .and .true .emit OP_DIVIDE;
 430 /*multiplicative_expression_4
 431     percent .and unary_expression .and .true .emit OP_MODULUS;*/
 432
 433 /*
 434  * <additive_expression> ::= <multiplicative_expression>
 435  *                         | <additive_expression> "+" <multiplicative_expression>
 436  *                         | <additive_expression> "-" <multiplicative_expression>
 437  */
 438 additive_expression
 439     multiplicative_expression .and .loop additive_expression_1;
 440 additive_expression_1
 441     additive_expression_2 .or additive_expression_3;
 442 additive_expression_2
 443     plus .and multiplicative_expression .and .true .emit OP_ADD;
 444 additive_expression_3
 445     minus .and multiplicative_expression .and .true .emit OP_SUBTRACT;
 446
 447 /*
 448  * <shift_expression> ::= <additive_expression>
 449  *                      | <shift_expression> "<<" <additive_expression> // reserved
 450  *                      | <shift_expression> ">>" <additive_expression> // reserved
 451  */
 452 shift_expression
 453     additive_expression/* .and .loop shift_expression_1*/;
 454 /*shift_expression_1
 455     shift_expression_2 .or shift_expression_3;*/
 456 /*shift_expression_2
 457     lessless .and additive_expression .and .true .emit OP_LSHIFT;*/
 458 /*shift_expression_3
 459     greatergreater .and additive_expression .and .true .emit OP_RSHIFT;*/
 460
 461 /*
 462  * <relational_expression> ::= <shift_expression>
 463  *                           | <relational_expression> "<" <shift_expression>
 464  *                           | <relational_expression> ">" <shift_expression>
 465  *                           | <relational_expression> "<=" <shift_expression>
 466  *                           | <relational_expression> ">=" <shift_expression>
 467  */
 468 relational_expression
 469     shift_expression .and .loop relational_expression_1;
 470 relational_expression_1
 471     relational_expression_2 .or relational_expression_3 .or relational_expression_4 .or
 472     relational_expression_5;
 473 relational_expression_2
 474     lessequals .and shift_expression .and .true .emit OP_LESSEQUAL;
 475 relational_expression_3
 476     greaterequals .and shift_expression .and .true .emit OP_GREATEREQUAL;
 477 relational_expression_4
 478     less .and shift_expression .and .true .emit OP_LESS;
 479 relational_expression_5
 480     greater .and shift_expression .and .true .emit OP_GREATER;
 481
 482 /*
 483  * <equality_expression> ::= <relational_expression>
 484  *                         | <equality_expression> "==" <relational_expression>
 485  *                         | <equality_expression> "!=" <relational_expression>
 486  */
 487 equality_expression
 488     relational_expression .and .loop equality_expression_1;
 489 equality_expression_1
 490     equality_expression_2 .or equality_expression_3;
 491 equality_expression_2
 492     equalsequals .and relational_expression .and .true .emit OP_EQUAL;
 493 equality_expression_3
 494     bangequals .and relational_expression .and .true .emit OP_NOTEQUAL;
 495
 496 /*
 497  * <and_expression> ::= <equality_expression>
 498  *                    | <and_expression> "&" <equality_expression> // reserved
 499  */
 500 and_expression
 501     equality_expression/* .and .loop and_expression_1*/;
 502 /*and_expression_1
 503     ampersand .and equality_expression .and .true .emit OP_BITAND;*/
 504
 505 /*
 506  * <exclusive_or_expression> ::= <and_expression>
 507  *                             | <exclusive_or_expression> "^" <and_expression> // reserved
 508  */
 509 exclusive_or_expression
 510     and_expression/* .and .loop exclusive_or_expression_1*/;
 511 /*exclusive_or_expression_1
 512     caret .and and_expression .and .true .emit OP_BITXOR;*/
 513
 514 /*
 515  * <inclusive_or_expression> ::= <exclusive_or_expression>
 516  *                             | <inclusive_or_expression> "|" <exclusive_or_expression> // reserved
 517  */
 518 inclusive_or_expression
 519     exclusive_or_expression/* .and .loop inclusive_or_expression_1*/;
 520 /*inclusive_or_expression_1
 521     bar .and exclusive_or_expression .and .true .emit OP_BITOR;*/
 522
 523 /*
 524  * <logical_and_expression> ::= <inclusive_or_expression>
 525  *                            | <logical_and_expression> "&&" <inclusive_or_expression>
 526  */
 527 logical_and_expression
 528     inclusive_or_expression .and .loop logical_and_expression_1;
 529 logical_and_expression_1
 530     ampersandampersand .and inclusive_or_expression .and .true .emit OP_LOGICALAND;
 531
 532 /*
 533  * <logical_xor_expression> ::= <logical_and_expression>
 534  *                            | <logical_xor_expression> "^^" <logical_and_expression>
 535  */
 536 logical_xor_expression
 537     logical_and_expression .and .loop logical_xor_expression_1;
 538 logical_xor_expression_1
 539     caretcaret .and logical_and_expression .and .true .emit OP_LOGICALXOR;
 540
 541 /*
 542  * <logical_or_expression> ::= <logical_xor_expression>
 543  *                           | <logical_or_expression> "||" <logical_xor_expression>
 544  */
 545 logical_or_expression
 546     logical_xor_expression .and .loop logical_or_expression_1;
 547 logical_or_expression_1
 548     barbar .and logical_xor_expression .and .true .emit OP_LOGICALOR;
 549
 550 /*
 551  * <conditional_expression> ::= <logical_or_expression>
 552  *                            | <logical_or_expression> "?" <expression> ":" <conditional_expression>
 553  */
 554 conditional_expression
 555     logical_or_expression .and .loop conditional_expression_1;
 556 conditional_expression_1
 557     question .and expression .and colon .and conditional_expression .and .true .emit OP_SELECT;
 558
 559 /*
 560  * <assignment_expression> ::= <conditional_expression>
 561  *                           | <unary_expression> <assignment_operator> <assignment_expression>
 562  *
 563  * <assignment_operator> ::= "="
 564  *                         | "*="
 565  *                         | "/="
 566  *                         | "+="
 567  *                         | "-="
 568  *                         | "%=" // reserved
 569  *                         | "<<=" // reserved
 570  *                         | ">>=" // reserved
 571  *                         | "&=" // reserved
 572  *                         | "^=" // reserved
 573  *                         | "|=" // reserved
 574  */
 575 assignment_expression
 576     assignment_expression_1 .or assignment_expression_2 .or assignment_expression_3 .or
 577     assignment_expression_4 .or assignment_expression_5/* .or assignment_expression_6 .or
 578     assignment_expression_7 .or assignment_expression_8 .or assignment_expression_9 .or
 579     assignment_expression_10 .or assignment_expression_11*/ .or conditional_expression;
 580 assignment_expression_1
 581     unary_expression .and equals .and assignment_expression .and .true .emit OP_ASSIGN;
 582 assignment_expression_2
 583     unary_expression .and starequals .and assignment_expression .and .true .emit OP_MULASSIGN;
 584 assignment_expression_3
 585     unary_expression .and slashequals .and assignment_expression .and .true .emit OP_DIVASSIGN;
 586 assignment_expression_4
 587     unary_expression .and plusequals .and assignment_expression .and .true .emit OP_ADDASSIGN;
 588 assignment_expression_5
 589     unary_expression .and minusequals .and assignment_expression .and .true .emit OP_SUBASSIGN;
 590 /*assignment_expression_6
 591     unary_expression .and percentequals .and assignment_expression .and .true .emit OP_MODASSIGN;*/
 592 /*assignment_expression_7
 593     unary_expression .and lesslessequals .and assignment_expression .and .true .emit OP_LSHASSIGN;*/
 594 /*assignment_expression_8
 595     unary_expression .and greatergreaterequals .and assignment_expression .and
 596     .true .emit OP_RSHASSIGN;*/
 597 /*assignment_expression_9
 598     unary_expression .and ampersandequals .and assignment_expression .and .true .emit OP_ANDASSIGN;*/
 599 /*assignment_expression_10
 600     unary_expression .and caretequals .and assignment_expression .and .true .emit OP_XORASSIGN;*/
 601 /*assignment_expression_11
 602     unary_expression .and barequals .and assignment_expression .and .true .emit OP_ORASSIGN;*/
 603
 604 /*
 605  * <expression> ::= <assignment_expression>
 606  *                | <expression> "," <assignment_expression>
 607  */
 608 expression
 609     assignment_expression .and .loop expression_1;
 610 expression_1
 611     comma .and assignment_expression .and .true .emit OP_SEQUENCE;
 612
 613 /*
 614  * <constant_expression> ::= <conditional_expression>
 615  */
 616 constant_expression
 617     conditional_expression .and .true .emit OP_END;
 618
 619 /*
 620  * <declaration> ::= <function_prototype> ";"
 621  *                 | <init_declarator_list> ";"
 622  */
 623 declaration
 624     declaration_1 .or declaration_2;
 625 declaration_1
 626     function_prototype .emit DECLARATION_FUNCTION_PROTOTYPE .and semicolon;
 627 declaration_2
 628     init_declarator_list .emit DECLARATION_INIT_DECLARATOR_LIST .and semicolon;
 629
 630 /*
 631  * <function_prototype> ::= <function_header> "void" ")"
 632  *                        | <function_declarator> ")"
 633  */
 634 function_prototype
 635     function_prototype_1 .or function_prototype_2;
 636 function_prototype_1
 637     function_header .and "void" .and rparen .error RPAREN_EXPECTED .emit PARAMETER_NONE;
 638 function_prototype_2
 639     function_declarator .and rparen .error RPAREN_EXPECTED .emit PARAMETER_NONE;
 640
 641 /*
 642  * <function_declarator> ::= <function_header>
 643  *                         | <function_header_with_parameters>
 644  */
 645 function_declarator
 646     function_header_with_parameters .or function_header;
 647
 648 /*
 649  * <function_header_with_parameters> ::= <function_header> <parameter_declaration>
 650  *                                     | <function_header_with_parameters> ","
 651  *                                       <parameter_declaration>
 652  */
 653 function_header_with_parameters
 654     function_header .and parameter_declaration .and .loop function_header_with_parameters_1;
 655 function_header_with_parameters_1
 656     comma .and parameter_declaration;
 657
 658 /*
 659  * <function_header> ::= <fully_specified_type> <identifier> "("
 660  */
 661 function_header
 662     function_header_nospace .or function_header_space;
 663 function_header_space
 664     fully_specified_type_space .and space .and function_decl_identifier .and lparen;
 665 function_header_nospace
 666     fully_specified_type_nospace .and function_decl_identifier .and lparen;
 667
 668 /*
 669  * <function_decl_identifier> ::= "__constructor"
 670  *                              | <__operator>
 671  *                              | <identifier>
 672  *
 673  * note: this is an extension to the standard language specification.
 674  * normally slang disallows operator and constructor prototypes and definitions
 675  */
 676 function_decl_identifier
 677     .if (parsing_builtin != 0) __operator .emit FUNCTION_OPERATOR .or
 678     .if (parsing_builtin != 0) "__constructor" .emit FUNCTION_CONSTRUCTOR .or
 679     identifier .emit FUNCTION_ORDINARY;
 680
 681 /*
 682  * <__operator> ::= "__operator" <overriden_op>
 683  *
 684  * note: this is an extension to the standard language specification.
 685  * normally slang disallows operator prototypes and definitions
 686  */
 687 __operator
 688     "__operator" .and overriden_operator .error INVALID_OPERATOR_OVERRIDE;
 689
 690 /*
 691  * <overriden_op> ::= "="
 692  *                  | "+="
 693  *                  | "-="
 694  *                  | "*="
 695  *                  | "/="
 696  *                  | "%=" // reserved
 697  *                  | "<<=" // reserved
 698  *                  | ">>=" // reserved
 699  *                  | "&=" // reserved
 700  *                  | "^=" // reserved
 701  *                  | "|=" // reserved
 702  *                  | "^^"
 703  *                  | "|" // reserved
 704  *                  | "^" // reserved
 705  *                  | "&" // reserved
 706  *                  | "=="
 707  *                  | "!="
 708  *                  | "<"
 709  *                  | ">"
 710  *                  | "<="
 711  *                  | ">="
 712  *                  | "<<" // reserved
 713  *                  | ">>" // reserved
 714  *                  | "*"
 715  *                  | "/"
 716  *                  | "%" // reserved
 717  *                  | "++"
 718  *                  | "--"
 719  *                  | "+"
 720  *                  | "-"
 721  *                  | "~" // reserved
 722  *                  | "!"
 723  *
 724  * note: this is an extension to the standard language specification.
 725  * normally slang disallows operator prototypes and definitions
 726  */
 727 overriden_operator
 728     plusplus .emit OPERATOR_INCREMENT .or
 729     plusequals .emit OPERATOR_ADDASSIGN .or
 730     plus .emit OPERATOR_PLUS .or
 731     minusminus .emit OPERATOR_DECREMENT .or
 732     minusequals .emit OPERATOR_SUBASSIGN .or
 733     minus .emit OPERATOR_MINUS .or
 734     bang .emit OPERATOR_NOT .or
 735     starequals .emit OPERATOR_MULASSIGN .or
 736     star .emit OPERATOR_MULTIPLY .or
 737     slashequals .emit OPERATOR_DIVASSIGN .or
 738     slash .emit OPERATOR_DIVIDE .or
 739     lessequals .emit OPERATOR_LESSEQUAL .or
 740     /*lesslessequals .emit OPERATOR_LSHASSIGN .or*/
 741     /*lessless .emit OPERATOR_LSHIFT .or*/
 742     less .emit OPERATOR_LESS .or
 743     greaterequals .emit OPERATOR_GREATEREQUAL .or
 744     /*greatergreaterequals .emit OPERATOR_RSHASSIGN .or*/
 745     /*greatergreater .emit OPERATOR_RSHIFT .or*/
 746     greater .emit OPERATOR_GREATER .or
 747     /*percentequals .emit OPERATOR_MODASSIGN .or*/
 748     /*percent .emit OPERATOR_MODULUS .or*/
 749     /*ampersandequals .emit OPERATOR_ANDASSIGN */
 750     /*ampersand .emit OPERATOR_BITAND .or*/
 751     /*barequals .emit OPERATOR_ORASSIGN .or*/
 752     /*bar .emit OPERATOR_BITOR .or*/
 753     /*tilde .emit OPERATOR_COMPLEMENT .or*/
 754     /*caretequals .emit OPERATOR_XORASSIGN .or*/
 755     caretcaret .emit OPERATOR_LOGICALXOR /*.or
 756     caret .emit OPERATOR_BITXOR*/;
 757
 758 /*
 759  * <parameter_declarator> ::= <type_specifier> <identifier>
 760  *                          | <type_specifier> <identifier> "[" <constant_expression> "]"
 761  */
 762 parameter_declarator
 763     parameter_declarator_nospace .or parameter_declarator_space;
 764 parameter_declarator_nospace
 765     type_specifier_nospace .and identifier .and parameter_declarator_1;
 766 parameter_declarator_space
 767     type_specifier_space .and space .and identifier .and parameter_declarator_1;
 768 parameter_declarator_1
 769     parameter_declarator_2 .emit PARAMETER_ARRAY_PRESENT .or
 770     .true .emit PARAMETER_ARRAY_NOT_PRESENT;
 771 parameter_declarator_2
 772     lbracket .and constant_expression .and rbracket;
 773
 774 /*
 775  * <parameter_declaration> ::= <type_qualifier> <parameter_qualifier>
 776  *                             <precision> <parameter_declarator>
 777  *                           | <type_qualifier> <parameter_qualifier>
 778  *                             <precision> <parameter_type_specifier>
 779  *                           | <type_qualifier> <parameter_qualifier>
 780  *                             <parameter_declarator>
 781  *                           | <type_qualifier> <parameter_qualifier>
 782  *                             <parameter_type_specifier>
 783  *                           | <parameter_qualifier> <precision>
 784  *                             <parameter_declarator>
 785  *                           | <parameter_qualifier> <precision>
 786  *                             <parameter_type_specifier>
 787  *                           | <parameter_qualifier> <parameter_declarator>
 788  *                           | <parameter_qualifier> <parameter_type_specifier>
 789  */
 790 parameter_declaration
 791     parameter_declaration_1 .emit PARAMETER_NEXT;
 792 parameter_declaration_1
 793     parameter_declaration_2 .or parameter_declaration_3;
 794 parameter_declaration_2
 795     type_qualifier .and space .and parameter_qualifier .and parameter_declaration_4;
 796 parameter_declaration_3
 797     parameter_qualifier .emit TYPE_QUALIFIER_NONE .and parameter_declaration_4;
 798 parameter_declaration_4
 799     parameter_declaration_optprec .and parameter_declaration_rest;
 800 parameter_declaration_optprec
 801     parameter_declaration_prec .or .true .emit PRECISION_DEFAULT;
 802 parameter_declaration_prec
 803     precision .and space;
 804 parameter_declaration_rest
 805     parameter_declarator .or parameter_type_specifier;
 806
 807 /*
 808  * <parameter_qualifier> ::= "in"
 809  *                         | "out"
 810  *                         | "inout"
 811  *                         | ""
 812  */
 813 parameter_qualifier
 814     parameter_qualifier_1 .or .true .emit PARAM_QUALIFIER_IN;
 815 parameter_qualifier_1
 816     parameter_qualifier_2 .and space;
 817 parameter_qualifier_2
 818     "in" .emit PARAM_QUALIFIER_IN .or
 819     "out" .emit PARAM_QUALIFIER_OUT .or
 820     "inout" .emit PARAM_QUALIFIER_INOUT;
 821
 822 /*
 823  * <parameter_type_specifier> ::= <type_specifier>
 824  *                              | <type_specifier> "[" <constant_expression> "]"
 825  */
 826 parameter_type_specifier
 827     parameter_type_specifier_1 .and .true .emit '\0' .and parameter_type_specifier_2;
 828 parameter_type_specifier_1
 829     type_specifier_nospace .or type_specifier_space;
 830 parameter_type_specifier_2
 831     parameter_type_specifier_3 .emit PARAMETER_ARRAY_PRESENT .or
 832     .true .emit PARAMETER_ARRAY_NOT_PRESENT;
 833 parameter_type_specifier_3
 834     lbracket .and constant_expression .and rbracket;
 835
 836 /*
 837  * <init_declarator_list> ::= <single_declaration>
 838  *                          | <init_declarator_list> "," <identifier>
 839  *                          | <init_declarator_list> "," <identifier> "[" "]"
 840  *                          | <init_declarator_list> "," <identifier> "["
 841  *                            <constant_expression> "]"
 842  *                          | <init_declarator_list> "," <identifier> "="
 843  *                            <initializer>
 844  */
 845 init_declarator_list
 846     single_declaration .and .loop init_declarator_list_1 .emit DECLARATOR_NEXT .and
 847     .true .emit DECLARATOR_NONE;
 848 init_declarator_list_1
 849     comma .and identifier .emit VARIABLE_IDENTIFIER .and init_declarator_list_2;
 850 init_declarator_list_2
 851     init_declarator_list_3 .or init_declarator_list_4 .or .true .emit VARIABLE_NONE;
 852 init_declarator_list_3
 853     equals .and initializer .emit VARIABLE_INITIALIZER;
 854 init_declarator_list_4
 855     lbracket .and init_declarator_list_5 .and rbracket;
 856 init_declarator_list_5
 857     constant_expression .emit VARIABLE_ARRAY_EXPLICIT .or .true .emit VARIABLE_ARRAY_UNKNOWN;
 858
 859 /*
 860  * <single_declaration> ::= <fully_specified_type>
 861  *                        | <fully_specified_type> <identifier>
 862  *                        | <fully_specified_type> <identifier> "[" "]"
 863  *                        | <fully_specified_type> <identifier> "["
 864  *                          <constant_expression> "]"
 865  *                        | <fully_specified_type> <identifier> "=" <initializer>
 866 */
 867 single_declaration
 868     single_declaration_nospace .or single_declaration_space;
 869 single_declaration_space
 870     fully_specified_type_space .and single_declaration_space_1;
 871 single_declaration_nospace
 872     fully_specified_type_nospace .and single_declaration_nospace_1;
 873 single_declaration_space_1
 874     single_declaration_space_2 .emit VARIABLE_IDENTIFIER .or .true .emit VARIABLE_NONE;
 875 single_declaration_nospace_1
 876     single_declaration_nospace_2 .emit VARIABLE_IDENTIFIER .or .true .emit VARIABLE_NONE;
 877 single_declaration_space_2
 878     space .and identifier .and single_declaration_3;
 879 single_declaration_nospace_2
 880     identifier .and single_declaration_3;
 881 single_declaration_3
 882     single_declaration_4 .or single_declaration_5 .or .true .emit VARIABLE_NONE;
 883 single_declaration_4
 884     equals .and initializer .emit VARIABLE_INITIALIZER;
 885 single_declaration_5
 886     lbracket .and single_declaration_6 .and rbracket;
 887 single_declaration_6
 888     constant_expression .emit VARIABLE_ARRAY_EXPLICIT .or .true .emit VARIABLE_ARRAY_UNKNOWN;
 889
 890 /*
 891  * <fully_specified_type> ::= <opt_invariant> <opt_centroid> <opt_qualifer> <opt_precision> <type_specifier>
 892  *
 893  * Example: "invariant varying highp vec3"
 894  */
 895 fully_specified_type_space
 896     fully_specified_type_optinvariant .and fully_specified_type_optcentroid .and fully_specified_type_optqual .and fully_specified_type_optprec .and type_specifier_space;
 897 fully_specified_type_nospace
 898     fully_specified_type_optinvariant .and fully_specified_type_optcentroid .and fully_specified_type_optqual .and fully_specified_type_optprec .and type_specifier_nospace;
 899 fully_specified_type_optinvariant
 900     fully_specified_type_invariant .or .true .emit TYPE_VARIANT;
 901 fully_specified_type_invariant
 902     invariant_qualifier .and space;
 903 fully_specified_type_optcentroid
 904     fully_specified_type_centroid .or .true .emit TYPE_CENTER;
 905 fully_specified_type_centroid
 906     centroid_qualifier .and space;
 907 fully_specified_type_optqual
 908     fully_specified_type_qual .or .true .emit TYPE_QUALIFIER_NONE;
 909 fully_specified_type_qual
 910     type_qualifier .and space;
 911 fully_specified_type_optprec
 912     fully_specified_type_prec .or .true .emit PRECISION_DEFAULT;
 913 fully_specified_type_prec
 914     precision .and space;
 915
 916 /*
 917  * <invariant_qualifier> ::= "invariant"
 918  */
 919 invariant_qualifier
 920     "invariant" .emit TYPE_INVARIANT;
 921
 922 centroid_qualifier
 923     "centroid" .emit TYPE_CENTROID;
 924
 925
 926 /*
 927  *  <type_qualifier> ::= "const"
 928  *                     | "attribute" // Vertex only.
 929  *                     | "varying"
 930  *                     | "uniform"
 931  *                     | "__fixed_output"
 932  *                     | "__fixed_input"
 933  *
 934  * note: this is an extension to the standard language specification,
 935  * normally slang disallows __fixed_output and __fixed_input type qualifiers
 936  */
 937 type_qualifier
 938     "const" .emit TYPE_QUALIFIER_CONST .or
 939     .if (shader_type == 2) "attribute" .emit TYPE_QUALIFIER_ATTRIBUTE .or
 940     "varying" .emit TYPE_QUALIFIER_VARYING .or
 941     "uniform" .emit TYPE_QUALIFIER_UNIFORM .or
 942     .if (parsing_builtin != 0) "__fixed_output" .emit TYPE_QUALIFIER_FIXEDOUTPUT .or
 943     .if (parsing_builtin != 0) "__fixed_input" .emit TYPE_QUALIFIER_FIXEDINPUT;
 944
 945 /*
 946  * <type_specifier> ::= "void"
 947  *                    | "float"
 948  *                    | "int"
 949  *                    | "bool"
 950  *                    | "vec2"
 951  *                    | "vec3"
 952  *                    | "vec4"
 953  *                    | "bvec2"
 954  *                    | "bvec3"
 955  *                    | "bvec4"
 956  *                    | "ivec2"
 957  *                    | "ivec3"
 958  *                    | "ivec4"
 959  *                    | "mat2"
 960  *                    | "mat3"
 961  *                    | "mat4"
 962  *                    | "mat2x3"
 963  *                    | "mat3x2"
 964  *                    | "mat2x4"
 965  *                    | "mat4x2"
 966  *                    | "mat3x4"
 967  *                    | "mat4x3"
 968  *                    | "sampler1D"
 969  *                    | "sampler2D"
 970  *                    | "sampler3D"
 971  *                    | "samplerCube"
 972  *                    | "sampler1DShadow"
 973  *                    | "sampler2DShadow"
 974  *                    | "sampler2DRect"
 975  *                    | "sampler2DRectShadow"
 976  *                    | <struct_specifier>
 977  *                    | <type_name>
 978  */
 979 type_specifier_space
 980     "void" .emit TYPE_SPECIFIER_VOID .or
 981     "float" .emit TYPE_SPECIFIER_FLOAT .or
 982     "int" .emit TYPE_SPECIFIER_INT .or
 983     "bool" .emit TYPE_SPECIFIER_BOOL .or
 984     "vec2" .emit TYPE_SPECIFIER_VEC2 .or
 985     "vec3" .emit TYPE_SPECIFIER_VEC3 .or
 986     "vec4" .emit TYPE_SPECIFIER_VEC4 .or
 987     "bvec2" .emit TYPE_SPECIFIER_BVEC2 .or
 988     "bvec3" .emit TYPE_SPECIFIER_BVEC3 .or
 989     "bvec4" .emit TYPE_SPECIFIER_BVEC4 .or
 990     "ivec2" .emit TYPE_SPECIFIER_IVEC2 .or
 991     "ivec3" .emit TYPE_SPECIFIER_IVEC3 .or
 992     "ivec4" .emit TYPE_SPECIFIER_IVEC4 .or
 993     "mat2" .emit TYPE_SPECIFIER_MAT2 .or
 994     "mat3" .emit TYPE_SPECIFIER_MAT3 .or
 995     "mat4" .emit TYPE_SPECIFIER_MAT4 .or
 996     "mat2x3" .emit TYPE_SPECIFIER_MAT23 .or
 997     "mat3x2" .emit TYPE_SPECIFIER_MAT32 .or
 998     "mat2x4" .emit TYPE_SPECIFIER_MAT24 .or
 999     "mat4x2" .emit TYPE_SPECIFIER_MAT42 .or
1000     "mat3x4" .emit TYPE_SPECIFIER_MAT34 .or
1001     "mat4x3" .emit TYPE_SPECIFIER_MAT43 .or
1002     "sampler1D" .emit TYPE_SPECIFIER_SAMPLER1D .or
1003     "sampler2D" .emit TYPE_SPECIFIER_SAMPLER2D .or
1004     "sampler3D" .emit TYPE_SPECIFIER_SAMPLER3D .or
1005     "samplerCube" .emit TYPE_SPECIFIER_SAMPLERCUBE .or
1006     "sampler1DShadow" .emit TYPE_SPECIFIER_SAMPLER1DSHADOW .or
1007     "sampler2DShadow" .emit TYPE_SPECIFIER_SAMPLER2DSHADOW .or
1008     "sampler2DRect" .emit TYPE_SPECIFIER_SAMPLER2DRECT .or
1009     "sampler2DRectShadow" .emit TYPE_SPECIFIER_SAMPLER2DRECTSHADOW .or
1010     type_name .emit TYPE_SPECIFIER_TYPENAME;
1011 type_specifier_nospace
1012     struct_specifier .emit TYPE_SPECIFIER_STRUCT;
1013
1014 /*
1015  * <struct_specifier> ::= "struct" <identifier> "{" <struct_declaration_list> "}"
1016  *                       | "struct" "{" <struct_declaration_list> "}"
1017  */
1018 struct_specifier
1019     "struct" .and struct_specifier_1 .and optional_space .and lbrace .error LBRACE_EXPECTED .and
1020     struct_declaration_list .and rbrace .emit FIELD_NONE;
1021 struct_specifier_1
1022     struct_specifier_2 .or .true .emit '\0';
1023 struct_specifier_2
1024     space .and identifier;
1025
1026 /*
1027  * <struct_declaration_list> ::= <struct_declaration>
1028  *                              | <struct_declaration_list> <struct_declaration>
1029  */
1030 struct_declaration_list
1031     struct_declaration .and .loop struct_declaration .emit FIELD_NEXT;
1032
1033 /*
1034  * <struct_declaration> ::= <type_specifier> <struct_declarator_list> ";"
1035  */
1036 struct_declaration
1037     struct_declaration_nospace .or struct_declaration_space;
1038 struct_declaration_space
1039     type_specifier_space .and space .and struct_declarator_list .and semicolon .emit FIELD_NONE;
1040 struct_declaration_nospace
1041     type_specifier_nospace .and struct_declarator_list .and semicolon .emit FIELD_NONE;
1042
1043 /*
1044  * <struct_declarator_list> ::= <struct_declarator>
1045  *                             | <struct_declarator_list> "," <struct_declarator>
1046  */
1047 struct_declarator_list
1048     struct_declarator .and .loop struct_declarator_list_1 .emit FIELD_NEXT;
1049 struct_declarator_list_1
1050     comma .and struct_declarator;
1051
1052 /*
1053  * <struct_declarator> ::= <identifier>
1054  *                       | <identifier> "[" <constant_expression> "]"
1055  */
1056 struct_declarator
1057     identifier .and struct_declarator_1;
1058 struct_declarator_1
1059     struct_declarator_2 .emit FIELD_ARRAY .or .true .emit FIELD_NONE;
1060 struct_declarator_2
1061     lbracket .and constant_expression .and rbracket;
1062
1063 /*
1064  * <initializer> ::= <assignment_expression>
1065  */
1066 initializer
1067     assignment_expression .and .true .emit OP_END;
1068
1069 /*
1070  * <declaration_statement> ::= <declaration>
1071  */
1072 declaration_statement
1073     declaration;
1074
1075 /*
1076  * <statement> ::= <compound_statement>
1077  *               | <simple_statement>
1078  */
1079 statement
1080     compound_statement .or simple_statement;
1081 statement_space
1082     compound_statement .or statement_space_1;
1083 statement_space_1
1084     space .and simple_statement;
1085
1086 /*
1087  * <simple_statement> ::= <__asm_statement>
1088  *                      | <selection_statement>
1089  *                      | <iteration_statement>
1090  *                      | <jump_statement>
1091  *                      | <expression_statement>
1092  *                      | <declaration_statement>
1093  *
1094  * note: this is an extension to the standard language specification.
1095  * normally slang disallows use of __asm statements
1096  */
1097 simple_statement
1098     .if (parsing_builtin != 0) __asm_statement .emit OP_ASM .or
1099     selection_statement .or
1100     iteration_statement .or
1101     precision_stmt .emit OP_PRECISION .or
1102     jump_statement .or
1103     expression_statement .emit OP_EXPRESSION .or
1104     declaration_statement .emit OP_DECLARE;
1105
1106 /*
1107  * <compound_statement> ::= "{" "}"
1108  *                        | "{" <statement_list> "}"
1109  */
1110 compound_statement
1111     compound_statement_1 .emit OP_BLOCK_BEGIN_NEW_SCOPE .and .true .emit OP_END;
1112 compound_statement_1
1113     compound_statement_2 .or compound_statement_3;
1114 compound_statement_2
1115     lbrace .and rbrace;
1116 compound_statement_3
1117     lbrace .and statement_list .and rbrace;
1118
1119 /*
1120  * <statement_no_new_scope> ::= <compound_statement_no_new_scope>
1121  *                            | <simple_statement>
1122  */
1123 statement_no_new_scope
1124     compound_statement_no_new_scope .or simple_statement;
1125
1126 /*
1127  * <compound_statement_no_new_scope> ::= "{" "}"
1128  *                                     | "{" <statement_list> "}"
1129  */
1130 compound_statement_no_new_scope
1131     compound_statement_no_new_scope_1 .emit OP_BLOCK_BEGIN_NO_NEW_SCOPE .and .true .emit OP_END;
1132 compound_statement_no_new_scope_1
1133     compound_statement_no_new_scope_2 .or compound_statement_no_new_scope_3;
1134 compound_statement_no_new_scope_2
1135     lbrace .and rbrace;
1136 compound_statement_no_new_scope_3
1137     lbrace .and statement_list .and rbrace;
1138
1139 /*
1140  * <statement_list> ::= <statement>
1141  *                    | <statement_list> <statement>
1142  */
1143 statement_list
1144     statement .and .loop statement;
1145
1146 /*
1147  * <expression_statement> ::= ";"
1148  *                          | <expression> ";"
1149  */
1150 expression_statement
1151     expression_statement_1 .or expression_statement_2;
1152 expression_statement_1
1153     semicolon .emit OP_PUSH_VOID .emit OP_END;
1154 expression_statement_2
1155     expression .and semicolon .emit OP_END;
1156
1157 /*
1158  * <selection_statement> ::= "if" "(" <expression> ")" <selection_rest_statement>
1159  */
1160 selection_statement
1161     "if" .emit OP_IF .and lparen .error LPAREN_EXPECTED .and expression .and
1162     rparen .error RPAREN_EXPECTED .emit OP_END .and selection_rest_statement;
1163
1164 /*
1165  * <selection_rest_statement> ::= <statement> "else" <statement>
1166  *                              | <statement>
1167  */
1168 selection_rest_statement
1169     statement .and selection_rest_statement_1;
1170 selection_rest_statement_1
1171     selection_rest_statement_2 .or .true .emit OP_EXPRESSION .emit OP_PUSH_VOID .emit OP_END;
1172 selection_rest_statement_2
1173     "else" .and optional_space .and statement;
1174
1175 /*
1176  * <condition> ::= <expression>
1177  *               | <fully_specified_type> <identifier> "=" <initializer>
1178  *
1179  * note: if <condition_1> is executed, the emit format must
1180  * match <declaration> emit format
1181  */
1182 condition
1183     condition_1 .emit OP_DECLARE .emit DECLARATION_INIT_DECLARATOR_LIST .or
1184     condition_3 .emit OP_EXPRESSION;
1185 condition_1
1186     condition_1_nospace .or condition_1_space;
1187 condition_1_nospace
1188     fully_specified_type_nospace .and condition_2;
1189 condition_1_space
1190     fully_specified_type_space .and space .and condition_2;
1191 condition_2
1192     identifier .emit VARIABLE_IDENTIFIER .and equals .emit VARIABLE_INITIALIZER .and
1193     initializer .and .true .emit DECLARATOR_NONE;
1194 condition_3
1195     expression .and .true .emit OP_END;
1196
1197 /*
1198  * <iteration_statement> ::= "while" "(" <condition> ")" <statement>
1199  *                         | "do" <statement> "while" "(" <expression> ")" ";"
1200  *                         | "for" "(" <for_init_statement> <for_rest_statement> ")"
1201  *                            <statement_no_new_scope>
1202  */
1203 iteration_statement
1204     iteration_statement_1 .or iteration_statement_2 .or iteration_statement_3;
1205 iteration_statement_1
1206     "while" .emit OP_WHILE .and lparen .error LPAREN_EXPECTED .and condition .and
1207     rparen .error RPAREN_EXPECTED .and statement;
1208 iteration_statement_2
1209     "do" .emit OP_DO .and statement_space .and "while" .and lparen .error LPAREN_EXPECTED .and
1210     expression .and rparen .error RPAREN_EXPECTED .emit OP_END .and semicolon;
1211 iteration_statement_3
1212     "for" .emit OP_FOR .and lparen .error LPAREN_EXPECTED .and for_init_statement .and
1213     for_rest_statement .and rparen .error RPAREN_EXPECTED .and statement_no_new_scope;
1214
1215 /*
1216  * <for_init_statement> ::= <expression_statement>
1217  *                        | <declaration_statement>
1218  */
1219 for_init_statement
1220     expression_statement .emit OP_EXPRESSION .or declaration_statement .emit OP_DECLARE;
1221
1222 /*
1223  * <conditionopt> ::= <condition>
1224  *                  | ""
1225  *
1226  * note: <conditionopt> is used only by "for" statement.
1227  * if <condition> is ommitted, parser simulates default behaviour,
1228  * that is simulates "true" expression
1229  */
1230 conditionopt
1231     condition .or
1232     .true .emit OP_EXPRESSION .emit OP_PUSH_BOOL .emit 2 .emit '1' .emit '\0' .emit OP_END;
1233
1234 /*
1235  * <for_rest_statement> ::= <conditionopt> ";"
1236  *                        | <conditionopt> ";" <expression>
1237  */
1238 for_rest_statement
1239     conditionopt .and semicolon .and for_rest_statement_1;
1240 for_rest_statement_1
1241     for_rest_statement_2 .or .true .emit OP_PUSH_VOID .emit OP_END;
1242 for_rest_statement_2
1243     expression .and .true .emit OP_END;
1244
1245 /*
1246  * <jump_statement> ::= "continue" ";"
1247  *                    | "break" ";"
1248  *                    | "return" ";"
1249  *                    | "return" <expression> ";"
1250  *                    | "discard" ";" // Fragment shader only.
1251  */
1252 jump_statement
1253     jump_statement_1 .or jump_statement_2 .or jump_statement_3 .or jump_statement_4 .or
1254     .if (shader_type == 1) jump_statement_5;
1255 jump_statement_1
1256     "continue" .and semicolon .emit OP_CONTINUE;
1257 jump_statement_2
1258     "break" .and semicolon .emit OP_BREAK;
1259 jump_statement_3
1260     "return" .emit OP_RETURN .and optional_space .and expression .and semicolon .emit OP_END;
1261 jump_statement_4
1262     "return" .emit OP_RETURN .and semicolon .emit OP_PUSH_VOID .emit OP_END;
1263 jump_statement_5
1264     "discard" .and semicolon .emit OP_DISCARD;
1265
1266 /*
1267  * <__asm_statement> ::= "__asm" <identifier> <asm_arguments> ";"
1268  *
1269  * note: this is an extension to the standard language specification.
1270  * normally slang disallows __asm statements
1271  */
1272 __asm_statement
1273     "__asm" .and space .and identifier .and space .and asm_arguments .and semicolon .emit OP_END;
1274
1275 /*
1276  * <asm_arguments> ::= <asm_argument>
1277  *                   | <asm_arguments> "," <asm_argument>
1278  *
1279  * note: this is an extension to the standard language specification.
1280  * normally slang disallows __asm statements
1281  */
1282 asm_arguments
1283     asm_argument .and .true .emit OP_END .and .loop asm_arguments_1;
1284 asm_arguments_1
1285     comma .and asm_argument .and .true .emit OP_END;
1286
1287 /*
1288  * <asm_argument> ::= <variable_identifier>
1289  *                  | <floatconstant>
1290  *
1291  * note: this is an extension to the standard language specification.
1292  * normally slang disallows __asm statements
1293  */
1294 asm_argument
1295     var_with_field .or
1296     variable_identifier .or
1297     floatconstant;
1298
1299 var_with_field
1300     variable_identifier .and dot .and field_selection .emit OP_FIELD;
1301
1302
1303 /*
1304  * <translation_unit> ::= <external_declaration>
1305  *                      | <translation_unit> <external_declaration>
1306  */
1307 translation_unit
1308     optional_space .emit REVISION .and external_declaration .error INVALID_EXTERNAL_DECLARATION .and
1309     .loop external_declaration .and optional_space .and
1310     '\0' .error INVALID_EXTERNAL_DECLARATION .emit EXTERNAL_NULL;
1311
1312
1313 /*
1314  * <external_declaration> ::= <function_definition>
1315  *                          | <declaration>
1316  */
1317 external_declaration
1318     precision_stmt .emit DEFAULT_PRECISION .or
1319     function_definition .emit EXTERNAL_FUNCTION_DEFINITION .or
1320     invariant_stmt .emit INVARIANT_STMT .or
1321     declaration .emit EXTERNAL_DECLARATION;
1322
1323
1324 /*
1325  * <precision_stmt> ::= "precision" <precision> <prectype>
1326  */
1327 precision_stmt
1328     "precision" .and space .and precision .error INVALID_PRECISION .and space .and prectype .error INVALID_PRECISION_TYPE .and semicolon;
1329
1330 /*
1331  * <precision> ::= "lowp"
1332  *               | "mediump"
1333  *               | "highp"
1334  */
1335 precision
1336     "lowp" .emit PRECISION_LOW .or
1337     "mediump" .emit PRECISION_MEDIUM .or
1338     "highp" .emit PRECISION_HIGH;
1339
1340 /*
1341  * <prectype> ::= "int"
1342  *              | "float"
1343  *              | "a sampler type"
1344  */
1345 prectype
1346     "int" .emit TYPE_SPECIFIER_INT .or
1347     "float" .emit TYPE_SPECIFIER_FLOAT .or
1348     "sampler1D" .emit TYPE_SPECIFIER_SAMPLER1D .or
1349     "sampler2D" .emit TYPE_SPECIFIER_SAMPLER2D .or
1350     "sampler3D" .emit TYPE_SPECIFIER_SAMPLER3D .or
1351     "samplerCube" .emit TYPE_SPECIFIER_SAMPLERCUBE .or
1352     "sampler1DShadow" .emit TYPE_SPECIFIER_SAMPLER1DSHADOW .or
1353     "sampler2DShadow" .emit TYPE_SPECIFIER_SAMPLER2DSHADOW .or
1354     "sampler2DRect" .emit TYPE_SPECIFIER_SAMPLER2DRECT .or
1355     "sampler2DRectShadow" .emit TYPE_SPECIFIER_SAMPLER2DRECTSHADOW;
1356
1357
1358 /*
1359  * <invariant_stmt> ::= "invariant" identifier;
1360  */
1361 invariant_stmt
1362     "invariant" .and space .and identifier .and semicolon;
1363
1364
1365 /*
1366  * <function_definition> :: <function_prototype> <compound_statement_no_new_scope>
1367  */
1368 function_definition
1369     function_prototype .and compound_statement_no_new_scope;
1370
1371
1372
1373 /*
1374  * helper rules, not part of the official language syntax
1375  */
1376
1377 digit_oct
1378     '0'-'7';
1379
1380 digit_dec
1381     '0'-'9';
1382
1383 digit_hex
1384     '0'-'9' .or 'A'-'F' .or 'a'-'f';
1385
1386 id_character_first
1387     'a'-'z' .or 'A'-'Z' .or '_';
1388
1389 id_character_next
1390     id_character_first .or digit_dec;
1391
1392 identifier
1393     id_character_first .emit * .and .loop id_character_next .emit * .and .true .emit '\0';
1394
1395 float
1396     float_1 .or float_2 .or float_3;
1397 float_1
1398     float_fractional_constant .and float_optional_exponent_part .and optional_f_suffix;
1399 float_2
1400     float_digit_sequence .and .true .emit '\0' .and float_exponent_part .and optional_f_suffix;
1401 float_3
1402     float_digit_sequence .and .true .emit '\0' .and 'f' .emit '\0';
1403
1404 float_fractional_constant
1405     float_fractional_constant_1 .or float_fractional_constant_2 .or float_fractional_constant_3;
1406 float_fractional_constant_1
1407     float_digit_sequence .and '.' .and float_digit_sequence;
1408 float_fractional_constant_2
1409     float_digit_sequence .and '.' .and .true .emit '\0';
1410 float_fractional_constant_3
1411     '.' .emit '\0' .and float_digit_sequence;
1412
1413 float_optional_exponent_part
1414     float_exponent_part .or .true .emit '\0';
1415
1416 float_digit_sequence
1417     digit_dec .emit * .and .loop digit_dec .emit * .and .true .emit '\0';
1418
1419 float_exponent_part
1420     float_exponent_part_1 .or float_exponent_part_2;
1421 float_exponent_part_1
1422     'e' .and float_optional_sign .and float_digit_sequence;
1423 float_exponent_part_2
1424     'E' .and float_optional_sign .and float_digit_sequence;
1425
1426 float_optional_sign
1427     float_sign .or .true;
1428
1429 float_sign
1430     '+' .or '-' .emit '-';
1431
1432 optional_f_suffix
1433     'f' .or .true;
1434
1435
1436 integer
1437     integer_hex .or integer_oct .or integer_dec;
1438
1439 integer_hex
1440     '0' .and integer_hex_1 .emit 0x10 .and digit_hex .emit * .and .loop digit_hex .emit * .and
1441     .true .emit '\0';
1442 integer_hex_1
1443     'x' .or 'X';
1444
1445 integer_oct
1446     '0' .emit 8 .emit * .and .loop digit_oct .emit * .and .true .emit '\0';
1447
1448 integer_dec
1449     digit_dec .emit 10 .emit * .and .loop digit_dec .emit * .and .true .emit '\0';
1450
1451 boolean
1452     "true" .emit 2 .emit '1' .emit '\0' .or
1453     "false" .emit 2 .emit '0' .emit '\0';
1454
1455 type_name
1456     identifier;
1457
1458 field_selection
1459     identifier;
1460
1461 floatconstant
1462     float .emit OP_PUSH_FLOAT;
1463
1464 intconstant
1465     integer .emit OP_PUSH_INT;
1466
1467 boolconstant
1468     boolean .emit OP_PUSH_BOOL;
1469
1470 optional_space
1471     .loop single_space;
1472
1473 space
1474     single_space .and .loop single_space;
1475
1476 single_space
1477     white_char .or c_style_comment_block .or cpp_style_comment_block;
1478
1479 white_char
1480     ' ' .or '\t' .or new_line .or '\v' .or '\f';
1481
1482 new_line
1483     cr_lf .or lf_cr .or '\n' .or '\r';
1484
1485 cr_lf
1486     '\r' .and '\n';
1487
1488 lf_cr
1489     '\n' .and '\r';
1490
1491 c_style_comment_block
1492     '/' .and '*' .and c_style_comment_rest;
1493
1494 c_style_comment_rest
1495     .loop c_style_comment_char_no_star .and c_style_comment_rest_1;
1496 c_style_comment_rest_1
1497     c_style_comment_end .or c_style_comment_rest_2;
1498 c_style_comment_rest_2
1499     '*' .and c_style_comment_rest;
1500
1501 c_style_comment_char_no_star
1502     '\x2B'-'\xFF' .or '\x01'-'\x29';
1503
1504 c_style_comment_end
1505     '*' .and '/';
1506
1507 cpp_style_comment_block
1508     '/' .and '/' .and cpp_style_comment_block_1;
1509 cpp_style_comment_block_1
1510     cpp_style_comment_block_2 .or cpp_style_comment_block_3;
1511 cpp_style_comment_block_2
1512     .loop cpp_style_comment_char .and new_line;
1513 cpp_style_comment_block_3
1514     .loop cpp_style_comment_char;
1515
1516 cpp_style_comment_char
1517     '\x0E'-'\xFF' .or '\x01'-'\x09' .or '\x0B'-'\x0C';
1518
1519 /* lexical rules */
1520
1521 /*ampersand
1522     optional_space .and '&' .and optional_space;*/
1523
1524 ampersandampersand
1525     optional_space .and '&' .and '&' .and optional_space;
1526
1527 /*ampersandequals
1528     optional_space .and '&' .and '=' .and optional_space;*/
1529
1530 /*bar
1531     optional_space .and '|' .and optional_space;*/
1532
1533 barbar
1534     optional_space .and '|' .and '|' .and optional_space;
1535
1536 /*barequals
1537     optional_space .and '|' .and '=' .and optional_space;*/
1538
1539 bang
1540     optional_space .and '!' .and optional_space;
1541
1542 bangequals
1543     optional_space .and '!' .and '=' .and optional_space;
1544
1545 /*caret
1546     optional_space .and '^' .and optional_space;*/
1547
1548 caretcaret
1549     optional_space .and '^' .and '^' .and optional_space;
1550
1551 /*caretequals
1552     optional_space .and '^' .and '=' .and optional_space;*/
1553
1554 colon
1555     optional_space .and ':' .and optional_space;
1556
1557 comma
1558     optional_space .and ',' .and optional_space;
1559
1560 dot
1561     optional_space .and '.' .and optional_space;
1562
1563 equals
1564     optional_space .and '=' .and optional_space;
1565
1566 equalsequals
1567     optional_space .and '=' .and '=' .and optional_space;
1568
1569 greater
1570     optional_space .and '>' .and optional_space;
1571
1572 greaterequals
1573     optional_space .and '>' .and '=' .and optional_space;
1574
1575 /*greatergreater
1576     optional_space .and '>' .and '>' .and optional_space;*/
1577
1578 /*greatergreaterequals
1579     optional_space .and '>' .and '>' .and '=' .and optional_space;*/
1580
1581 lbrace
1582     optional_space .and '{' .and optional_space;
1583
1584 lbracket
1585     optional_space .and '[' .and optional_space;
1586
1587 less
1588     optional_space .and '<' .and optional_space;
1589
1590 lessequals
1591     optional_space .and '<' .and '=' .and optional_space;
1592
1593 /*lessless
1594     optional_space .and '<' .and '<' .and optional_space;*/
1595
1596 /*lesslessequals
1597     optional_space .and '<' .and '<' .and '=' .and optional_space;*/
1598
1599 lparen
1600     optional_space .and '(' .and optional_space;
1601
1602 minus
1603     optional_space .and '-' .and optional_space;
1604
1605 minusequals
1606     optional_space .and '-' .and '=' .and optional_space;
1607
1608 minusminus
1609     optional_space .and '-' .and '-' .and optional_space;
1610
1611 /*percent
1612     optional_space .and '%' .and optional_space;*/
1613
1614 /*percentequals
1615     optional_space .and '%' .and '=' .and optional_space;*/
1616
1617 plus
1618     optional_space .and '+' .and optional_space;
1619
1620 plusequals
1621     optional_space .and '+' .and '=' .and optional_space;
1622
1623 plusplus
1624     optional_space .and '+' .and '+' .and optional_space;
1625
1626 question
1627     optional_space .and '?' .and optional_space;
1628
1629 rbrace
1630     optional_space .and '}' .and optional_space;
1631
1632 rbracket
1633     optional_space .and ']' .and optional_space;
1634
1635 rparen
1636     optional_space .and ')' .and optional_space;
1637
1638 semicolon
1639     optional_space .and ';' .and optional_space;
1640
1641 slash
1642     optional_space .and '/' .and optional_space;
1643
1644 slashequals
1645     optional_space .and '/' .and '=' .and optional_space;
1646
1647 star
1648     optional_space .and '*' .and optional_space;
1649
1650 starequals
1651     optional_space .and '*' .and '=' .and optional_space;
1652
1653 /*tilde
1654     optional_space .and '~' .and optional_space;*/
1655
1656 /* string rules - these are used internally by the parser when parsing quoted strings */
1657
1658 .string string_lexer;
1659
1660 string_lexer
1661     lex_first_identifier_character .and .loop lex_next_identifier_character;
1662
1663 lex_first_identifier_character
1664     'a'-'z' .or 'A'-'Z' .or '_';
1665
1666 lex_next_identifier_character
1667     'a'-'z' .or 'A'-'Z' .or '0'-'9' .or '_';
1668
1669 /* error rules - these are used by error messages */
1670
1671 err_token
1672     '~' .or '`' .or '!' .or '@' .or '#' .or '$' .or '%' .or '^' .or '&' .or '*' .or '(' .or ')' .or
1673     '-' .or '+' .or '=' .or '|' .or '\\' .or '[' .or ']' .or '{' .or '}' .or ':' .or ';' .or '"' .or
1674     '\'' .or '<' .or ',' .or '>' .or '.' .or '/' .or '?' .or err_identifier;
1675
1676 err_identifier
1677     id_character_first .and .loop id_character_next;
1678