src/compiler/glsl/glsl_parser.yy

   1 %{
   2 /*
   3  * Copyright © 2008, 2009 Intel Corporation
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  */
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #ifndef _MSC_VER
  28 #include <strings.h>
  29 #endif
  30 #include <assert.h>
  31
  32 #include "ast.h"
  33 #include "glsl_parser_extras.h"
  34 #include "compiler/glsl_types.h"
  35 #include "main/context.h"
  36
  37 #ifdef _MSC_VER
  38 #pragma warning( disable : 4065 ) // switch statement contains 'default' but no 'case' labels
  39 #endif
  40
  41 #undef yyerror
  42
  43 static void yyerror(YYLTYPE *loc, _mesa_glsl_parse_state *st, const char *msg)
  44 {
  45    _mesa_glsl_error(loc, st, "%s", msg);
  46 }
  47
  48 static int
  49 _mesa_glsl_lex(YYSTYPE *val, YYLTYPE *loc, _mesa_glsl_parse_state *state)
  50 {
  51    return _mesa_glsl_lexer_lex(val, loc, state->scanner);
  52 }
  53
  54 static bool match_layout_qualifier(const char *s1, const char *s2,
  55                                    _mesa_glsl_parse_state *state)
  56 {
  57    /* From the GLSL 1.50 spec, section 4.3.8 (Layout Qualifiers):
  58     *
  59     *     "The tokens in any layout-qualifier-id-list ... are not case
  60     *     sensitive, unless explicitly noted otherwise."
  61     *
  62     * The text "unless explicitly noted otherwise" appears to be
  63     * vacuous--no desktop GLSL spec (up through GLSL 4.40) notes
  64     * otherwise.
  65     *
  66     * However, the GLSL ES 3.00 spec says, in section 4.3.8 (Layout
  67     * Qualifiers):
  68     *
  69     *     "As for other identifiers, they are case sensitive."
  70     *
  71     * So we need to do a case-sensitive or a case-insensitive match,
  72     * depending on whether we are compiling for GLSL ES.
  73     */
  74    if (state->es_shader)
  75       return strcmp(s1, s2);
  76    else
  77       return strcasecmp(s1, s2);
  78 }
  79 %}
  80
  81 %expect 0
  82
  83 %pure-parser
  84 %error-verbose
  85
  86 %locations
  87 %initial-action {
  88    @$.first_line = 1;
  89    @$.first_column = 1;
  90    @$.last_line = 1;
  91    @$.last_column = 1;
  92    @$.source = 0;
  93 }
  94
  95 %lex-param   {struct _mesa_glsl_parse_state *state}
  96 %parse-param {struct _mesa_glsl_parse_state *state}
  97
  98 %union {
  99    int n;
 100    int64_t n64;
 101    float real;
 102    double dreal;
 103    const char *identifier;
 104
 105    struct ast_type_qualifier type_qualifier;
 106
 107    ast_node *node;
 108    ast_type_specifier *type_specifier;
 109    ast_array_specifier *array_specifier;
 110    ast_fully_specified_type *fully_specified_type;
 111    ast_function *function;
 112    ast_parameter_declarator *parameter_declarator;
 113    ast_function_definition *function_definition;
 114    ast_compound_statement *compound_statement;
 115    ast_expression *expression;
 116    ast_declarator_list *declarator_list;
 117    ast_struct_specifier *struct_specifier;
 118    ast_declaration *declaration;
 119    ast_switch_body *switch_body;
 120    ast_case_label *case_label;
 121    ast_case_label_list *case_label_list;
 122    ast_case_statement *case_statement;
 123    ast_case_statement_list *case_statement_list;
 124    ast_interface_block *interface_block;
 125    ast_subroutine_list *subroutine_list;
 126    struct {
 127       ast_node *cond;
 128       ast_expression *rest;
 129    } for_rest_statement;
 130
 131    struct {
 132       ast_node *then_statement;
 133       ast_node *else_statement;
 134    } selection_rest_statement;
 135
 136    const glsl_type *type;
 137 }
 138
 139 %token ATTRIBUTE CONST_TOK
 140 %token <type> BASIC_TYPE_TOK
 141 %token BREAK BUFFER CONTINUE DO ELSE FOR IF DISCARD RETURN SWITCH CASE DEFAULT
 142 %token CENTROID IN_TOK OUT_TOK INOUT_TOK UNIFORM VARYING SAMPLE
 143 %token NOPERSPECTIVE FLAT SMOOTH
 144 %token IMAGE1DSHADOW IMAGE2DSHADOW IMAGE1DARRAYSHADOW IMAGE2DARRAYSHADOW
 145 %token COHERENT VOLATILE RESTRICT READONLY WRITEONLY
 146 %token SHARED
 147 %token STRUCT VOID_TOK WHILE
 148 %token <identifier> IDENTIFIER TYPE_IDENTIFIER NEW_IDENTIFIER
 149 %type <identifier> any_identifier
 150 %type <interface_block> instance_name_opt
 151 %token <real> FLOATCONSTANT
 152 %token <dreal> DOUBLECONSTANT
 153 %token <n> INTCONSTANT UINTCONSTANT BOOLCONSTANT
 154 %token <n64> INT64CONSTANT UINT64CONSTANT
 155 %token <identifier> FIELD_SELECTION
 156 %token LEFT_OP RIGHT_OP
 157 %token INC_OP DEC_OP LE_OP GE_OP EQ_OP NE_OP
 158 %token AND_OP OR_OP XOR_OP MUL_ASSIGN DIV_ASSIGN ADD_ASSIGN
 159 %token MOD_ASSIGN LEFT_ASSIGN RIGHT_ASSIGN AND_ASSIGN XOR_ASSIGN OR_ASSIGN
 160 %token SUB_ASSIGN
 161 %token INVARIANT PRECISE
 162 %token LOWP MEDIUMP HIGHP SUPERP PRECISION
 163
 164 %token VERSION_TOK EXTENSION LINE COLON EOL INTERFACE OUTPUT
 165 %token PRAGMA_DEBUG_ON PRAGMA_DEBUG_OFF
 166 %token PRAGMA_OPTIMIZE_ON PRAGMA_OPTIMIZE_OFF
 167 %token PRAGMA_WARNING_ON PRAGMA_WARNING_OFF
 168 %token PRAGMA_INVARIANT_ALL
 169 %token LAYOUT_TOK
 170 %token DOT_TOK
 171    /* Reserved words that are not actually used in the grammar.
 172     */
 173 %token ASM CLASS UNION ENUM TYPEDEF TEMPLATE THIS PACKED_TOK GOTO
 174 %token INLINE_TOK NOINLINE PUBLIC_TOK STATIC EXTERN EXTERNAL
 175 %token LONG_TOK SHORT_TOK HALF FIXED_TOK UNSIGNED INPUT_TOK
 176 %token HVEC2 HVEC3 HVEC4 FVEC2 FVEC3 FVEC4
 177 %token SAMPLER3DRECT
 178 %token SIZEOF CAST NAMESPACE USING
 179 %token RESOURCE PATCH
 180 %token SUBROUTINE
 181
 182 %token ERROR_TOK
 183
 184 %token COMMON PARTITION ACTIVE FILTER ROW_MAJOR
 185
 186 %type <identifier> variable_identifier
 187 %type <node> statement
 188 %type <node> statement_list
 189 %type <node> simple_statement
 190 %type <n> precision_qualifier
 191 %type <type_qualifier> type_qualifier
 192 %type <type_qualifier> auxiliary_storage_qualifier
 193 %type <type_qualifier> storage_qualifier
 194 %type <type_qualifier> interpolation_qualifier
 195 %type <type_qualifier> layout_qualifier
 196 %type <type_qualifier> layout_qualifier_id_list layout_qualifier_id
 197 %type <type_qualifier> interface_block_layout_qualifier
 198 %type <type_qualifier> memory_qualifier
 199 %type <type_qualifier> subroutine_qualifier
 200 %type <subroutine_list> subroutine_type_list
 201 %type <type_qualifier> interface_qualifier
 202 %type <type_specifier> type_specifier
 203 %type <type_specifier> type_specifier_nonarray
 204 %type <array_specifier> array_specifier
 205 %type <type> basic_type_specifier_nonarray
 206 %type <fully_specified_type> fully_specified_type
 207 %type <function> function_prototype
 208 %type <function> function_header
 209 %type <function> function_header_with_parameters
 210 %type <function> function_declarator
 211 %type <parameter_declarator> parameter_declarator
 212 %type <parameter_declarator> parameter_declaration
 213 %type <type_qualifier> parameter_qualifier
 214 %type <type_qualifier> parameter_direction_qualifier
 215 %type <type_specifier> parameter_type_specifier
 216 %type <function_definition> function_definition
 217 %type <compound_statement> compound_statement_no_new_scope
 218 %type <compound_statement> compound_statement
 219 %type <node> statement_no_new_scope
 220 %type <node> expression_statement
 221 %type <expression> expression
 222 %type <expression> primary_expression
 223 %type <expression> assignment_expression
 224 %type <expression> conditional_expression
 225 %type <expression> logical_or_expression
 226 %type <expression> logical_xor_expression
 227 %type <expression> logical_and_expression
 228 %type <expression> inclusive_or_expression
 229 %type <expression> exclusive_or_expression
 230 %type <expression> and_expression
 231 %type <expression> equality_expression
 232 %type <expression> relational_expression
 233 %type <expression> shift_expression
 234 %type <expression> additive_expression
 235 %type <expression> multiplicative_expression
 236 %type <expression> unary_expression
 237 %type <expression> constant_expression
 238 %type <expression> integer_expression
 239 %type <expression> postfix_expression
 240 %type <expression> function_call_header_with_parameters
 241 %type <expression> function_call_header_no_parameters
 242 %type <expression> function_call_header
 243 %type <expression> function_call_generic
 244 %type <expression> function_call_or_method
 245 %type <expression> function_call
 246 %type <n> assignment_operator
 247 %type <n> unary_operator
 248 %type <expression> function_identifier
 249 %type <node> external_declaration
 250 %type <node> pragma_statement
 251 %type <declarator_list> init_declarator_list
 252 %type <declarator_list> single_declaration
 253 %type <expression> initializer
 254 %type <expression> initializer_list
 255 %type <node> declaration
 256 %type <node> declaration_statement
 257 %type <node> jump_statement
 258 %type <node> interface_block
 259 %type <interface_block> basic_interface_block
 260 %type <struct_specifier> struct_specifier
 261 %type <declarator_list> struct_declaration_list
 262 %type <declarator_list> struct_declaration
 263 %type <declaration> struct_declarator
 264 %type <declaration> struct_declarator_list
 265 %type <declarator_list> member_list
 266 %type <declarator_list> member_declaration
 267 %type <node> selection_statement
 268 %type <selection_rest_statement> selection_rest_statement
 269 %type <node> switch_statement
 270 %type <switch_body> switch_body
 271 %type <case_label_list> case_label_list
 272 %type <case_label> case_label
 273 %type <case_statement> case_statement
 274 %type <case_statement_list> case_statement_list
 275 %type <node> iteration_statement
 276 %type <node> condition
 277 %type <node> conditionopt
 278 %type <node> for_init_statement
 279 %type <for_rest_statement> for_rest_statement
 280 %type <node> layout_defaults
 281 %type <type_qualifier> layout_uniform_defaults
 282 %type <type_qualifier> layout_buffer_defaults
 283 %type <type_qualifier> layout_in_defaults
 284 %type <type_qualifier> layout_out_defaults
 285
 286 %right THEN ELSE
 287 %%
 288
 289 translation_unit:
 290    version_statement extension_statement_list
 291    {
 292       _mesa_glsl_initialize_types(state);
 293    }
 294    external_declaration_list
 295    {
 296       delete state->symbols;
 297       state->symbols = new(ralloc_parent(state)) glsl_symbol_table;
 298       if (state->es_shader) {
 299          if (state->stage == MESA_SHADER_FRAGMENT) {
 300             state->symbols->add_default_precision_qualifier("int", ast_precision_medium);
 301          } else {
 302             state->symbols->add_default_precision_qualifier("float", ast_precision_high);
 303             state->symbols->add_default_precision_qualifier("int", ast_precision_high);
 304          }
 305          state->symbols->add_default_precision_qualifier("sampler2D", ast_precision_low);
 306          state->symbols->add_default_precision_qualifier("samplerExternalOES", ast_precision_low);
 307          state->symbols->add_default_precision_qualifier("samplerCube", ast_precision_low);
 308          state->symbols->add_default_precision_qualifier("atomic_uint", ast_precision_high);
 309       }
 310       _mesa_glsl_initialize_types(state);
 311    }
 312    ;
 313
 314 version_statement:
 315    /* blank - no #version specified: defaults are already set */
 316    | VERSION_TOK INTCONSTANT EOL
 317    {
 318       state->process_version_directive(&@2, $2, NULL);
 319       if (state->error) {
 320          YYERROR;
 321       }
 322    }
 323    | VERSION_TOK INTCONSTANT any_identifier EOL
 324    {
 325       state->process_version_directive(&@2, $2, $3);
 326       if (state->error) {
 327          YYERROR;
 328       }
 329    }
 330    ;
 331
 332 pragma_statement:
 333    PRAGMA_DEBUG_ON EOL { $$ = NULL; }
 334    | PRAGMA_DEBUG_OFF EOL { $$ = NULL; }
 335    | PRAGMA_OPTIMIZE_ON EOL { $$ = NULL; }
 336    | PRAGMA_OPTIMIZE_OFF EOL { $$ = NULL; }
 337    | PRAGMA_INVARIANT_ALL EOL
 338    {
 339       /* Pragma invariant(all) cannot be used in a fragment shader.
 340        *
 341        * Page 27 of the GLSL 1.20 spec, Page 53 of the GLSL ES 3.00 spec:
 342        *
 343        *     "It is an error to use this pragma in a fragment shader."
 344        */
 345       if (state->is_version(120, 300) &&
 346           state->stage == MESA_SHADER_FRAGMENT) {
 347          _mesa_glsl_error(& @1, state,
 348                           "pragma `invariant(all)' cannot be used "
 349                           "in a fragment shader.");
 350       } else if (!state->is_version(120, 100)) {
 351          _mesa_glsl_warning(& @1, state,
 352                             "pragma `invariant(all)' not supported in %s "
 353                             "(GLSL ES 1.00 or GLSL 1.20 required)",
 354                             state->get_version_string());
 355       } else {
 356          state->all_invariant = true;
 357       }
 358
 359       $$ = NULL;
 360    }
 361    | PRAGMA_WARNING_ON EOL
 362    {
 363       void *mem_ctx = state->linalloc;
 364       $$ = new(mem_ctx) ast_warnings_toggle(true);
 365    }
 366    | PRAGMA_WARNING_OFF EOL
 367    {
 368       void *mem_ctx = state->linalloc;
 369       $$ = new(mem_ctx) ast_warnings_toggle(false);
 370    }
 371    ;
 372
 373 extension_statement_list:
 374
 375    | extension_statement_list extension_statement
 376    ;
 377
 378 any_identifier:
 379    IDENTIFIER
 380    | TYPE_IDENTIFIER
 381    | NEW_IDENTIFIER
 382    ;
 383
 384 extension_statement:
 385    EXTENSION any_identifier COLON any_identifier EOL
 386    {
 387       if (!_mesa_glsl_process_extension($2, & @2, $4, & @4, state)) {
 388          YYERROR;
 389       }
 390    }
 391    ;
 392
 393 external_declaration_list:
 394    external_declaration
 395    {
 396       /* FINISHME: The NULL test is required because pragmas are set to
 397        * FINISHME: NULL. (See production rule for external_declaration.)
 398        */
 399       if ($1 != NULL)
 400          state->translation_unit.push_tail(& $1->link);
 401    }
 402    | external_declaration_list external_declaration
 403    {
 404       /* FINISHME: The NULL test is required because pragmas are set to
 405        * FINISHME: NULL. (See production rule for external_declaration.)
 406        */
 407       if ($2 != NULL)
 408          state->translation_unit.push_tail(& $2->link);
 409    }
 410    | external_declaration_list extension_statement {
 411       if (!state->allow_extension_directive_midshader) {
 412          _mesa_glsl_error(& @2, state,
 413                           "#extension directive is not allowed "
 414                           "in the middle of a shader");
 415          YYERROR;
 416       }
 417    }
 418    ;
 419
 420 variable_identifier:
 421    IDENTIFIER
 422    | NEW_IDENTIFIER
 423    ;
 424
 425 primary_expression:
 426    variable_identifier
 427    {
 428       void *ctx = state->linalloc;
 429       $$ = new(ctx) ast_expression(ast_identifier, NULL, NULL, NULL);
 430       $$->set_location(@1);
 431       $$->primary_expression.identifier = $1;
 432    }
 433    | INTCONSTANT
 434    {
 435       void *ctx = state->linalloc;
 436       $$ = new(ctx) ast_expression(ast_int_constant, NULL, NULL, NULL);
 437       $$->set_location(@1);
 438       $$->primary_expression.int_constant = $1;
 439    }
 440    | UINTCONSTANT
 441    {
 442       void *ctx = state->linalloc;
 443       $$ = new(ctx) ast_expression(ast_uint_constant, NULL, NULL, NULL);
 444       $$->set_location(@1);
 445       $$->primary_expression.uint_constant = $1;
 446    }
 447    | INT64CONSTANT
 448    {
 449       void *ctx = state->linalloc;
 450       $$ = new(ctx) ast_expression(ast_int64_constant, NULL, NULL, NULL);
 451       $$->set_location(@1);
 452       $$->primary_expression.int64_constant = $1;
 453    }
 454    | UINT64CONSTANT
 455    {
 456       void *ctx = state->linalloc;
 457       $$ = new(ctx) ast_expression(ast_uint64_constant, NULL, NULL, NULL);
 458       $$->set_location(@1);
 459       $$->primary_expression.uint64_constant = $1;
 460    }
 461    | FLOATCONSTANT
 462    {
 463       void *ctx = state->linalloc;
 464       $$ = new(ctx) ast_expression(ast_float_constant, NULL, NULL, NULL);
 465       $$->set_location(@1);
 466       $$->primary_expression.float_constant = $1;
 467    }
 468    | DOUBLECONSTANT
 469    {
 470       void *ctx = state->linalloc;
 471       $$ = new(ctx) ast_expression(ast_double_constant, NULL, NULL, NULL);
 472       $$->set_location(@1);
 473       $$->primary_expression.double_constant = $1;
 474    }
 475    | BOOLCONSTANT
 476    {
 477       void *ctx = state->linalloc;
 478       $$ = new(ctx) ast_expression(ast_bool_constant, NULL, NULL, NULL);
 479       $$->set_location(@1);
 480       $$->primary_expression.bool_constant = $1;
 481    }
 482    | '(' expression ')'
 483    {
 484       $$ = $2;
 485    }
 486    ;
 487
 488 postfix_expression:
 489    primary_expression
 490    | postfix_expression '[' integer_expression ']'
 491    {
 492       void *ctx = state->linalloc;
 493       $$ = new(ctx) ast_expression(ast_array_index, $1, $3, NULL);
 494       $$->set_location_range(@1, @4);
 495    }
 496    | function_call
 497    {
 498       $$ = $1;
 499    }
 500    | postfix_expression DOT_TOK FIELD_SELECTION
 501    {
 502       void *ctx = state->linalloc;
 503       $$ = new(ctx) ast_expression(ast_field_selection, $1, NULL, NULL);
 504       $$->set_location_range(@1, @3);
 505       $$->primary_expression.identifier = $3;
 506    }
 507    | postfix_expression INC_OP
 508    {
 509       void *ctx = state->linalloc;
 510       $$ = new(ctx) ast_expression(ast_post_inc, $1, NULL, NULL);
 511       $$->set_location_range(@1, @2);
 512    }
 513    | postfix_expression DEC_OP
 514    {
 515       void *ctx = state->linalloc;
 516       $$ = new(ctx) ast_expression(ast_post_dec, $1, NULL, NULL);
 517       $$->set_location_range(@1, @2);
 518    }
 519    ;
 520
 521 integer_expression:
 522    expression
 523    ;
 524
 525 function_call:
 526    function_call_or_method
 527    ;
 528
 529 function_call_or_method:
 530    function_call_generic
 531    ;
 532
 533 function_call_generic:
 534    function_call_header_with_parameters ')'
 535    | function_call_header_no_parameters ')'
 536    ;
 537
 538 function_call_header_no_parameters:
 539    function_call_header VOID_TOK
 540    | function_call_header
 541    ;
 542
 543 function_call_header_with_parameters:
 544    function_call_header assignment_expression
 545    {
 546       $$ = $1;
 547       $$->set_location(@1);
 548       $$->expressions.push_tail(& $2->link);
 549    }
 550    | function_call_header_with_parameters ',' assignment_expression
 551    {
 552       $$ = $1;
 553       $$->set_location(@1);
 554       $$->expressions.push_tail(& $3->link);
 555    }
 556    ;
 557
 558    // Grammar Note: Constructors look like functions, but lexical
 559    // analysis recognized most of them as keywords. They are now
 560    // recognized through "type_specifier".
 561 function_call_header:
 562    function_identifier '('
 563    ;
 564
 565 function_identifier:
 566    type_specifier
 567    {
 568       void *ctx = state->linalloc;
 569       $$ = new(ctx) ast_function_expression($1);
 570       $$->set_location(@1);
 571       }
 572    | postfix_expression
 573    {
 574       void *ctx = state->linalloc;
 575       $$ = new(ctx) ast_function_expression($1);
 576       $$->set_location(@1);
 577       }
 578    ;
 579
 580    // Grammar Note: Constructors look like methods, but lexical
 581    // analysis recognized most of them as keywords. They are now
 582    // recognized through "type_specifier".
 583
 584    // Grammar Note: No traditional style type casts.
 585 unary_expression:
 586    postfix_expression
 587    | INC_OP unary_expression
 588    {
 589       void *ctx = state->linalloc;
 590       $$ = new(ctx) ast_expression(ast_pre_inc, $2, NULL, NULL);
 591       $$->set_location(@1);
 592    }
 593    | DEC_OP unary_expression
 594    {
 595       void *ctx = state->linalloc;
 596       $$ = new(ctx) ast_expression(ast_pre_dec, $2, NULL, NULL);
 597       $$->set_location(@1);
 598    }
 599    | unary_operator unary_expression
 600    {
 601       void *ctx = state->linalloc;
 602       $$ = new(ctx) ast_expression($1, $2, NULL, NULL);
 603       $$->set_location_range(@1, @2);
 604    }
 605    ;
 606
 607    // Grammar Note: No '*' or '&' unary ops. Pointers are not supported.
 608 unary_operator:
 609    '+'   { $$ = ast_plus; }
 610    | '-' { $$ = ast_neg; }
 611    | '!' { $$ = ast_logic_not; }
 612    | '~' { $$ = ast_bit_not; }
 613    ;
 614
 615 multiplicative_expression:
 616    unary_expression
 617    | multiplicative_expression '*' unary_expression
 618    {
 619       void *ctx = state->linalloc;
 620       $$ = new(ctx) ast_expression_bin(ast_mul, $1, $3);
 621       $$->set_location_range(@1, @3);
 622    }
 623    | multiplicative_expression '/' unary_expression
 624    {
 625       void *ctx = state->linalloc;
 626       $$ = new(ctx) ast_expression_bin(ast_div, $1, $3);
 627       $$->set_location_range(@1, @3);
 628    }
 629    | multiplicative_expression '%' unary_expression
 630    {
 631       void *ctx = state->linalloc;
 632       $$ = new(ctx) ast_expression_bin(ast_mod, $1, $3);
 633       $$->set_location_range(@1, @3);
 634    }
 635    ;
 636
 637 additive_expression:
 638    multiplicative_expression
 639    | additive_expression '+' multiplicative_expression
 640    {
 641       void *ctx = state->linalloc;
 642       $$ = new(ctx) ast_expression_bin(ast_add, $1, $3);
 643       $$->set_location_range(@1, @3);
 644    }
 645    | additive_expression '-' multiplicative_expression
 646    {
 647       void *ctx = state->linalloc;
 648       $$ = new(ctx) ast_expression_bin(ast_sub, $1, $3);
 649       $$->set_location_range(@1, @3);
 650    }
 651    ;
 652
 653 shift_expression:
 654    additive_expression
 655    | shift_expression LEFT_OP additive_expression
 656    {
 657       void *ctx = state->linalloc;
 658       $$ = new(ctx) ast_expression_bin(ast_lshift, $1, $3);
 659       $$->set_location_range(@1, @3);
 660    }
 661    | shift_expression RIGHT_OP additive_expression
 662    {
 663       void *ctx = state->linalloc;
 664       $$ = new(ctx) ast_expression_bin(ast_rshift, $1, $3);
 665       $$->set_location_range(@1, @3);
 666    }
 667    ;
 668
 669 relational_expression:
 670    shift_expression
 671    | relational_expression '<' shift_expression
 672    {
 673       void *ctx = state->linalloc;
 674       $$ = new(ctx) ast_expression_bin(ast_less, $1, $3);
 675       $$->set_location_range(@1, @3);
 676    }
 677    | relational_expression '>' shift_expression
 678    {
 679       void *ctx = state->linalloc;
 680       $$ = new(ctx) ast_expression_bin(ast_greater, $1, $3);
 681       $$->set_location_range(@1, @3);
 682    }
 683    | relational_expression LE_OP shift_expression
 684    {
 685       void *ctx = state->linalloc;
 686       $$ = new(ctx) ast_expression_bin(ast_lequal, $1, $3);
 687       $$->set_location_range(@1, @3);
 688    }
 689    | relational_expression GE_OP shift_expression
 690    {
 691       void *ctx = state->linalloc;
 692       $$ = new(ctx) ast_expression_bin(ast_gequal, $1, $3);
 693       $$->set_location_range(@1, @3);
 694    }
 695    ;
 696
 697 equality_expression:
 698    relational_expression
 699    | equality_expression EQ_OP relational_expression
 700    {
 701       void *ctx = state->linalloc;
 702       $$ = new(ctx) ast_expression_bin(ast_equal, $1, $3);
 703       $$->set_location_range(@1, @3);
 704    }
 705    | equality_expression NE_OP relational_expression
 706    {
 707       void *ctx = state->linalloc;
 708       $$ = new(ctx) ast_expression_bin(ast_nequal, $1, $3);
 709       $$->set_location_range(@1, @3);
 710    }
 711    ;
 712
 713 and_expression:
 714    equality_expression
 715    | and_expression '&' equality_expression
 716    {
 717       void *ctx = state->linalloc;
 718       $$ = new(ctx) ast_expression_bin(ast_bit_and, $1, $3);
 719       $$->set_location_range(@1, @3);
 720    }
 721    ;
 722
 723 exclusive_or_expression:
 724    and_expression
 725    | exclusive_or_expression '^' and_expression
 726    {
 727       void *ctx = state->linalloc;
 728       $$ = new(ctx) ast_expression_bin(ast_bit_xor, $1, $3);
 729       $$->set_location_range(@1, @3);
 730    }
 731    ;
 732
 733 inclusive_or_expression:
 734    exclusive_or_expression
 735    | inclusive_or_expression '|' exclusive_or_expression
 736    {
 737       void *ctx = state->linalloc;
 738       $$ = new(ctx) ast_expression_bin(ast_bit_or, $1, $3);
 739       $$->set_location_range(@1, @3);
 740    }
 741    ;
 742
 743 logical_and_expression:
 744    inclusive_or_expression
 745    | logical_and_expression AND_OP inclusive_or_expression
 746    {
 747       void *ctx = state->linalloc;
 748       $$ = new(ctx) ast_expression_bin(ast_logic_and, $1, $3);
 749       $$->set_location_range(@1, @3);
 750    }
 751    ;
 752
 753 logical_xor_expression:
 754    logical_and_expression
 755    | logical_xor_expression XOR_OP logical_and_expression
 756    {
 757       void *ctx = state->linalloc;
 758       $$ = new(ctx) ast_expression_bin(ast_logic_xor, $1, $3);
 759       $$->set_location_range(@1, @3);
 760    }
 761    ;
 762
 763 logical_or_expression:
 764    logical_xor_expression
 765    | logical_or_expression OR_OP logical_xor_expression
 766    {
 767       void *ctx = state->linalloc;
 768       $$ = new(ctx) ast_expression_bin(ast_logic_or, $1, $3);
 769       $$->set_location_range(@1, @3);
 770    }
 771    ;
 772
 773 conditional_expression:
 774    logical_or_expression
 775    | logical_or_expression '?' expression ':' assignment_expression
 776    {
 777       void *ctx = state->linalloc;
 778       $$ = new(ctx) ast_expression(ast_conditional, $1, $3, $5);
 779       $$->set_location_range(@1, @5);
 780    }
 781    ;
 782
 783 assignment_expression:
 784    conditional_expression
 785    | unary_expression assignment_operator assignment_expression
 786    {
 787       void *ctx = state->linalloc;
 788       $$ = new(ctx) ast_expression($2, $1, $3, NULL);
 789       $$->set_location_range(@1, @3);
 790    }
 791    ;
 792
 793 assignment_operator:
 794    '='                { $$ = ast_assign; }
 795    | MUL_ASSIGN       { $$ = ast_mul_assign; }
 796    | DIV_ASSIGN       { $$ = ast_div_assign; }
 797    | MOD_ASSIGN       { $$ = ast_mod_assign; }
 798    | ADD_ASSIGN       { $$ = ast_add_assign; }
 799    | SUB_ASSIGN       { $$ = ast_sub_assign; }
 800    | LEFT_ASSIGN      { $$ = ast_ls_assign; }
 801    | RIGHT_ASSIGN     { $$ = ast_rs_assign; }
 802    | AND_ASSIGN       { $$ = ast_and_assign; }
 803    | XOR_ASSIGN       { $$ = ast_xor_assign; }
 804    | OR_ASSIGN        { $$ = ast_or_assign; }
 805    ;
 806
 807 expression:
 808    assignment_expression
 809    {
 810       $$ = $1;
 811    }
 812    | expression ',' assignment_expression
 813    {
 814       void *ctx = state->linalloc;
 815       if ($1->oper != ast_sequence) {
 816          $$ = new(ctx) ast_expression(ast_sequence, NULL, NULL, NULL);
 817          $$->set_location_range(@1, @3);
 818          $$->expressions.push_tail(& $1->link);
 819       } else {
 820          $$ = $1;
 821       }
 822
 823       $$->expressions.push_tail(& $3->link);
 824    }
 825    ;
 826
 827 constant_expression:
 828    conditional_expression
 829    ;
 830
 831 declaration:
 832    function_prototype ';'
 833    {
 834       state->symbols->pop_scope();
 835       $$ = $1;
 836    }
 837    | init_declarator_list ';'
 838    {
 839       $$ = $1;
 840    }
 841    | PRECISION precision_qualifier type_specifier ';'
 842    {
 843       $3->default_precision = $2;
 844       $$ = $3;
 845    }
 846    | interface_block
 847    {
 848       ast_interface_block *block = (ast_interface_block *) $1;
 849       if (block->layout.has_layout() || block->layout.has_memory()) {
 850          if (!block->default_layout.merge_qualifier(& @1, state, block->layout, false)) {
 851             YYERROR;
 852          }
 853       }
 854       block->layout = block->default_layout;
 855       if (!block->layout.push_to_global(& @1, state)) {
 856          YYERROR;
 857       }
 858       $$ = $1;
 859    }
 860    ;
 861
 862 function_prototype:
 863    function_declarator ')'
 864    ;
 865
 866 function_declarator:
 867    function_header
 868    | function_header_with_parameters
 869    ;
 870
 871 function_header_with_parameters:
 872    function_header parameter_declaration
 873    {
 874       $$ = $1;
 875       $$->parameters.push_tail(& $2->link);
 876    }
 877    | function_header_with_parameters ',' parameter_declaration
 878    {
 879       $$ = $1;
 880       $$->parameters.push_tail(& $3->link);
 881    }
 882    ;
 883
 884 function_header:
 885    fully_specified_type variable_identifier '('
 886    {
 887       void *ctx = state->linalloc;
 888       $$ = new(ctx) ast_function();
 889       $$->set_location(@2);
 890       $$->return_type = $1;
 891       $$->identifier = $2;
 892
 893       if ($1->qualifier.is_subroutine_decl()) {
 894          /* add type for IDENTIFIER search */
 895          state->symbols->add_type($2, glsl_type::get_subroutine_instance($2));
 896       } else
 897          state->symbols->add_function(new(state) ir_function($2));
 898       state->symbols->push_scope();
 899    }
 900    ;
 901
 902 parameter_declarator:
 903    type_specifier any_identifier
 904    {
 905       void *ctx = state->linalloc;
 906       $$ = new(ctx) ast_parameter_declarator();
 907       $$->set_location_range(@1, @2);
 908       $$->type = new(ctx) ast_fully_specified_type();
 909       $$->type->set_location(@1);
 910       $$->type->specifier = $1;
 911       $$->identifier = $2;
 912       state->symbols->add_variable(new(state) ir_variable(NULL, $2, ir_var_auto));
 913    }
 914    | layout_qualifier type_specifier any_identifier
 915    {
 916       if (state->allow_layout_qualifier_on_function_parameter) {
 917          void *ctx = state->linalloc;
 918          $$ = new(ctx) ast_parameter_declarator();
 919          $$->set_location_range(@2, @3);
 920          $$->type = new(ctx) ast_fully_specified_type();
 921          $$->type->set_location(@2);
 922          $$->type->specifier = $2;
 923          $$->identifier = $3;
 924          state->symbols->add_variable(new(state) ir_variable(NULL, $3, ir_var_auto));
 925       } else {
 926          _mesa_glsl_error(&@1, state,
 927                           "is is not allowed on function parameter");
 928          YYERROR;
 929       }
 930    }
 931    | type_specifier any_identifier array_specifier
 932    {
 933       void *ctx = state->linalloc;
 934       $$ = new(ctx) ast_parameter_declarator();
 935       $$->set_location_range(@1, @3);
 936       $$->type = new(ctx) ast_fully_specified_type();
 937       $$->type->set_location(@1);
 938       $$->type->specifier = $1;
 939       $$->identifier = $2;
 940       $$->array_specifier = $3;
 941       state->symbols->add_variable(new(state) ir_variable(NULL, $2, ir_var_auto));
 942    }
 943    ;
 944
 945 parameter_declaration:
 946    parameter_qualifier parameter_declarator
 947    {
 948       $$ = $2;
 949       $$->type->qualifier = $1;
 950       if (!$$->type->qualifier.push_to_global(& @1, state)) {
 951          YYERROR;
 952       }
 953    }
 954    | parameter_qualifier parameter_type_specifier
 955    {
 956       void *ctx = state->linalloc;
 957       $$ = new(ctx) ast_parameter_declarator();
 958       $$->set_location(@2);
 959       $$->type = new(ctx) ast_fully_specified_type();
 960       $$->type->set_location_range(@1, @2);
 961       $$->type->qualifier = $1;
 962       if (!$$->type->qualifier.push_to_global(& @1, state)) {
 963          YYERROR;
 964       }
 965       $$->type->specifier = $2;
 966    }
 967    ;
 968
 969 parameter_qualifier:
 970    /* empty */
 971    {
 972       memset(& $$, 0, sizeof($$));
 973    }
 974    | CONST_TOK parameter_qualifier
 975    {
 976       if ($2.flags.q.constant)
 977          _mesa_glsl_error(&@1, state, "duplicate const qualifier");
 978
 979       $$ = $2;
 980       $$.flags.q.constant = 1;
 981    }
 982    | PRECISE parameter_qualifier
 983    {
 984       if ($2.flags.q.precise)
 985          _mesa_glsl_error(&@1, state, "duplicate precise qualifier");
 986
 987       $$ = $2;
 988       $$.flags.q.precise = 1;
 989    }
 990    | parameter_direction_qualifier parameter_qualifier
 991    {
 992       if (($1.flags.q.in || $1.flags.q.out) && ($2.flags.q.in || $2.flags.q.out))
 993          _mesa_glsl_error(&@1, state, "duplicate in/out/inout qualifier");
 994
 995       if (!state->has_420pack_or_es31() && $2.flags.q.constant)
 996          _mesa_glsl_error(&@1, state, "in/out/inout must come after const "
 997                                       "or precise");
 998
 999       $$ = $1;
1000       $$.merge_qualifier(&@1, state, $2, false);
1001    }
1002    | precision_qualifier parameter_qualifier
1003    {
1004       if ($2.precision != ast_precision_none)
1005          _mesa_glsl_error(&@1, state, "duplicate precision qualifier");
1006
1007       if (!state->has_420pack_or_es31() &&
1008           $2.flags.i != 0)
1009          _mesa_glsl_error(&@1, state, "precision qualifiers must come last");
1010
1011       $$ = $2;
1012       $$.precision = $1;
1013    }
1014    | memory_qualifier parameter_qualifier
1015    {
1016       $$ = $1;
1017       $$.merge_qualifier(&@1, state, $2, false);
1018    }
1019
1020 parameter_direction_qualifier:
1021    IN_TOK
1022    {
1023       memset(& $$, 0, sizeof($$));
1024       $$.flags.q.in = 1;
1025    }
1026    | OUT_TOK
1027    {
1028       memset(& $$, 0, sizeof($$));
1029       $$.flags.q.out = 1;
1030    }
1031    | INOUT_TOK
1032    {
1033       memset(& $$, 0, sizeof($$));
1034       $$.flags.q.in = 1;
1035       $$.flags.q.out = 1;
1036    }
1037    ;
1038
1039 parameter_type_specifier:
1040    type_specifier
1041    ;
1042
1043 init_declarator_list:
1044    single_declaration
1045    | init_declarator_list ',' any_identifier
1046    {
1047       void *ctx = state->linalloc;
1048       ast_declaration *decl = new(ctx) ast_declaration($3, NULL, NULL);
1049       decl->set_location(@3);
1050
1051       $$ = $1;
1052       $$->declarations.push_tail(&decl->link);
1053       state->symbols->add_variable(new(state) ir_variable(NULL, $3, ir_var_auto));
1054    }
1055    | init_declarator_list ',' any_identifier array_specifier
1056    {
1057       void *ctx = state->linalloc;
1058       ast_declaration *decl = new(ctx) ast_declaration($3, $4, NULL);
1059       decl->set_location_range(@3, @4);
1060
1061       $$ = $1;
1062       $$->declarations.push_tail(&decl->link);
1063       state->symbols->add_variable(new(state) ir_variable(NULL, $3, ir_var_auto));
1064    }
1065    | init_declarator_list ',' any_identifier array_specifier '=' initializer
1066    {
1067       void *ctx = state->linalloc;
1068       ast_declaration *decl = new(ctx) ast_declaration($3, $4, $6);
1069       decl->set_location_range(@3, @4);
1070
1071       $$ = $1;
1072       $$->declarations.push_tail(&decl->link);
1073       state->symbols->add_variable(new(state) ir_variable(NULL, $3, ir_var_auto));
1074    }
1075    | init_declarator_list ',' any_identifier '=' initializer
1076    {
1077       void *ctx = state->linalloc;
1078       ast_declaration *decl = new(ctx) ast_declaration($3, NULL, $5);
1079       decl->set_location(@3);
1080
1081       $$ = $1;
1082       $$->declarations.push_tail(&decl->link);
1083       state->symbols->add_variable(new(state) ir_variable(NULL, $3, ir_var_auto));
1084    }
1085    ;
1086
1087    // Grammar Note: No 'enum', or 'typedef'.
1088 single_declaration:
1089    fully_specified_type
1090    {
1091       void *ctx = state->linalloc;
1092       /* Empty declaration list is valid. */
1093       $$ = new(ctx) ast_declarator_list($1);
1094       $$->set_location(@1);
1095    }
1096    | fully_specified_type any_identifier
1097    {
1098       void *ctx = state->linalloc;
1099       ast_declaration *decl = new(ctx) ast_declaration($2, NULL, NULL);
1100       decl->set_location(@2);
1101
1102       $$ = new(ctx) ast_declarator_list($1);
1103       $$->set_location_range(@1, @2);
1104       $$->declarations.push_tail(&decl->link);
1105       state->symbols->add_variable(new(state) ir_variable(NULL, $2, ir_var_auto));
1106    }
1107    | fully_specified_type any_identifier array_specifier
1108    {
1109       void *ctx = state->linalloc;
1110       ast_declaration *decl = new(ctx) ast_declaration($2, $3, NULL);
1111       decl->set_location_range(@2, @3);
1112
1113       $$ = new(ctx) ast_declarator_list($1);
1114       $$->set_location_range(@1, @3);
1115       $$->declarations.push_tail(&decl->link);
1116       state->symbols->add_variable(new(state) ir_variable(NULL, $2, ir_var_auto));
1117    }
1118    | fully_specified_type any_identifier array_specifier '=' initializer
1119    {
1120       void *ctx = state->linalloc;
1121       ast_declaration *decl = new(ctx) ast_declaration($2, $3, $5);
1122       decl->set_location_range(@2, @3);
1123
1124       $$ = new(ctx) ast_declarator_list($1);
1125       $$->set_location_range(@1, @3);
1126       $$->declarations.push_tail(&decl->link);
1127       state->symbols->add_variable(new(state) ir_variable(NULL, $2, ir_var_auto));
1128    }
1129    | fully_specified_type any_identifier '=' initializer
1130    {
1131       void *ctx = state->linalloc;
1132       ast_declaration *decl = new(ctx) ast_declaration($2, NULL, $4);
1133       decl->set_location(@2);
1134
1135       $$ = new(ctx) ast_declarator_list($1);
1136       $$->set_location_range(@1, @2);
1137       $$->declarations.push_tail(&decl->link);
1138       state->symbols->add_variable(new(state) ir_variable(NULL, $2, ir_var_auto));
1139    }
1140    | INVARIANT variable_identifier
1141    {
1142       void *ctx = state->linalloc;
1143       ast_declaration *decl = new(ctx) ast_declaration($2, NULL, NULL);
1144       decl->set_location(@2);
1145
1146       $$ = new(ctx) ast_declarator_list(NULL);
1147       $$->set_location_range(@1, @2);
1148       $$->invariant = true;
1149
1150       $$->declarations.push_tail(&decl->link);
1151    }
1152    | PRECISE variable_identifier
1153    {
1154       void *ctx = state->linalloc;
1155       ast_declaration *decl = new(ctx) ast_declaration($2, NULL, NULL);
1156       decl->set_location(@2);
1157
1158       $$ = new(ctx) ast_declarator_list(NULL);
1159       $$->set_location_range(@1, @2);
1160       $$->precise = true;
1161
1162       $$->declarations.push_tail(&decl->link);
1163    }
1164    ;
1165
1166 fully_specified_type:
1167    type_specifier
1168    {
1169       void *ctx = state->linalloc;
1170       $$ = new(ctx) ast_fully_specified_type();
1171       $$->set_location(@1);
1172       $$->specifier = $1;
1173    }
1174    | type_qualifier type_specifier
1175    {
1176       void *ctx = state->linalloc;
1177       $$ = new(ctx) ast_fully_specified_type();
1178       $$->set_location_range(@1, @2);
1179       $$->qualifier = $1;
1180       if (!$$->qualifier.push_to_global(& @1, state)) {
1181          YYERROR;
1182       }
1183       $$->specifier = $2;
1184       if ($$->specifier->structure != NULL &&
1185           $$->specifier->structure->is_declaration) {
1186             $$->specifier->structure->layout = &$$->qualifier;
1187       }
1188    }
1189    ;
1190
1191 layout_qualifier:
1192    LAYOUT_TOK '(' layout_qualifier_id_list ')'
1193    {
1194       $$ = $3;
1195    }
1196    ;
1197
1198 layout_qualifier_id_list:
1199    layout_qualifier_id
1200    | layout_qualifier_id_list ',' layout_qualifier_id
1201    {
1202       $$ = $1;
1203       if (!$$.merge_qualifier(& @3, state, $3, true)) {
1204          YYERROR;
1205       }
1206    }
1207    ;
1208
1209 layout_qualifier_id:
1210    any_identifier
1211    {
1212       memset(& $$, 0, sizeof($$));
1213
1214       /* Layout qualifiers for ARB_fragment_coord_conventions. */
1215       if (!$$.flags.i && (state->ARB_fragment_coord_conventions_enable ||
1216                           state->is_version(150, 0))) {
1217          if (match_layout_qualifier($1, "origin_upper_left", state) == 0) {
1218             $$.flags.q.origin_upper_left = 1;
1219          } else if (match_layout_qualifier($1, "pixel_center_integer",
1220                                            state) == 0) {
1221             $$.flags.q.pixel_center_integer = 1;
1222          }
1223
1224          if ($$.flags.i && state->ARB_fragment_coord_conventions_warn) {
1225             _mesa_glsl_warning(& @1, state,
1226                                "GL_ARB_fragment_coord_conventions layout "
1227                                "identifier `%s' used", $1);
1228          }
1229       }
1230
1231       /* Layout qualifiers for AMD/ARB_conservative_depth. */
1232       if (!$$.flags.i &&
1233           (state->AMD_conservative_depth_enable ||
1234            state->ARB_conservative_depth_enable ||
1235            state->is_version(420, 0))) {
1236          if (match_layout_qualifier($1, "depth_any", state) == 0) {
1237             $$.flags.q.depth_type = 1;
1238             $$.depth_type = ast_depth_any;
1239          } else if (match_layout_qualifier($1, "depth_greater", state) == 0) {
1240             $$.flags.q.depth_type = 1;
1241             $$.depth_type = ast_depth_greater;
1242          } else if (match_layout_qualifier($1, "depth_less", state) == 0) {
1243             $$.flags.q.depth_type = 1;
1244             $$.depth_type = ast_depth_less;
1245          } else if (match_layout_qualifier($1, "depth_unchanged",
1246                                            state) == 0) {
1247             $$.flags.q.depth_type = 1;
1248             $$.depth_type = ast_depth_unchanged;
1249          }
1250
1251          if ($$.flags.i && state->AMD_conservative_depth_warn) {
1252             _mesa_glsl_warning(& @1, state,
1253                                "GL_AMD_conservative_depth "
1254                                "layout qualifier `%s' is used", $1);
1255          }
1256          if ($$.flags.i && state->ARB_conservative_depth_warn) {
1257             _mesa_glsl_warning(& @1, state,
1258                                "GL_ARB_conservative_depth "
1259                                "layout qualifier `%s' is used", $1);
1260          }
1261       }
1262
1263       /* See also interface_block_layout_qualifier. */
1264       if (!$$.flags.i && state->has_uniform_buffer_objects()) {
1265          if (match_layout_qualifier($1, "std140", state) == 0) {
1266             $$.flags.q.std140 = 1;
1267          } else if (match_layout_qualifier($1, "shared", state) == 0) {
1268             $$.flags.q.shared = 1;
1269          } else if (match_layout_qualifier($1, "std430", state) == 0) {
1270             $$.flags.q.std430 = 1;
1271          } else if (match_layout_qualifier($1, "column_major", state) == 0) {
1272             $$.flags.q.column_major = 1;
1273          /* "row_major" is a reserved word in GLSL 1.30+. Its token is parsed
1274           * below in the interface_block_layout_qualifier rule.
1275           *
1276           * It is not a reserved word in GLSL ES 3.00, so it's handled here as
1277           * an identifier.
1278           *
1279           * Also, this takes care of alternate capitalizations of
1280           * "row_major" (which is necessary because layout qualifiers
1281           * are case-insensitive in desktop GLSL).
1282           */
1283          } else if (match_layout_qualifier($1, "row_major", state) == 0) {
1284             $$.flags.q.row_major = 1;
1285          /* "packed" is a reserved word in GLSL, and its token is
1286           * parsed below in the interface_block_layout_qualifier rule.
1287           * However, we must take care of alternate capitalizations of
1288           * "packed", because layout qualifiers are case-insensitive
1289           * in desktop GLSL.
1290           */
1291          } else if (match_layout_qualifier($1, "packed", state) == 0) {
1292            $$.flags.q.packed = 1;
1293          }
1294
1295          if ($$.flags.i && state->ARB_uniform_buffer_object_warn) {
1296             _mesa_glsl_warning(& @1, state,
1297                                "#version 140 / GL_ARB_uniform_buffer_object "
1298                                "layout qualifier `%s' is used", $1);
1299          }
1300       }
1301
1302       /* Layout qualifiers for GLSL 1.50 geometry shaders. */
1303       if (!$$.flags.i) {
1304          static const struct {
1305             const char *s;
1306             GLenum e;
1307          } map[] = {
1308                  { "points", GL_POINTS },
1309                  { "lines", GL_LINES },
1310                  { "lines_adjacency", GL_LINES_ADJACENCY },
1311                  { "line_strip", GL_LINE_STRIP },
1312                  { "triangles", GL_TRIANGLES },
1313                  { "triangles_adjacency", GL_TRIANGLES_ADJACENCY },
1314                  { "triangle_strip", GL_TRIANGLE_STRIP },
1315          };
1316          for (unsigned i = 0; i < ARRAY_SIZE(map); i++) {
1317             if (match_layout_qualifier($1, map[i].s, state) == 0) {
1318                $$.flags.q.prim_type = 1;
1319                $$.prim_type = map[i].e;
1320                break;
1321             }
1322          }
1323
1324          if ($$.flags.i && !state->has_geometry_shader() &&
1325              !state->has_tessellation_shader()) {
1326             _mesa_glsl_error(& @1, state, "#version 150 layout "
1327                              "qualifier `%s' used", $1);
1328          }
1329       }
1330
1331       /* Layout qualifiers for ARB_shader_image_load_store. */
1332       if (state->has_shader_image_load_store()) {
1333          if (!$$.flags.i) {
1334             static const struct {
1335                const char *name;
1336                GLenum format;
1337                glsl_base_type base_type;
1338                /** Minimum desktop GLSL version required for the image
1339                 * format.  Use 130 if already present in the original
1340                 * ARB extension.
1341                 */
1342                unsigned required_glsl;
1343                /** Minimum GLSL ES version required for the image format. */
1344                unsigned required_essl;
1345                /* NV_image_formats */
1346                bool nv_image_formats;
1347             } map[] = {
1348                { "rgba32f", GL_RGBA32F, GLSL_TYPE_FLOAT, 130, 310, false },
1349                { "rgba16f", GL_RGBA16F, GLSL_TYPE_FLOAT, 130, 310, false },
1350                { "rg32f", GL_RG32F, GLSL_TYPE_FLOAT, 130, 0, true },
1351                { "rg16f", GL_RG16F, GLSL_TYPE_FLOAT, 130, 0, true },
1352                { "r11f_g11f_b10f", GL_R11F_G11F_B10F, GLSL_TYPE_FLOAT, 130, 0, true },
1353                { "r32f", GL_R32F, GLSL_TYPE_FLOAT, 130, 310, false },
1354                { "r16f", GL_R16F, GLSL_TYPE_FLOAT, 130, 0, true },
1355                { "rgba32ui", GL_RGBA32UI, GLSL_TYPE_UINT, 130, 310, false },
1356                { "rgba16ui", GL_RGBA16UI, GLSL_TYPE_UINT, 130, 310, false },
1357                { "rgb10_a2ui", GL_RGB10_A2UI, GLSL_TYPE_UINT, 130, 0, true },
1358                { "rgba8ui", GL_RGBA8UI, GLSL_TYPE_UINT, 130, 310, false },
1359                { "rg32ui", GL_RG32UI, GLSL_TYPE_UINT, 130, 0, true },
1360                { "rg16ui", GL_RG16UI, GLSL_TYPE_UINT, 130, 0, true },
1361                { "rg8ui", GL_RG8UI, GLSL_TYPE_UINT, 130, 0, true },
1362                { "r32ui", GL_R32UI, GLSL_TYPE_UINT, 130, 310, false },
1363                { "r16ui", GL_R16UI, GLSL_TYPE_UINT, 130, 0, true },
1364                { "r8ui", GL_R8UI, GLSL_TYPE_UINT, 130, 0, true },
1365                { "rgba32i", GL_RGBA32I, GLSL_TYPE_INT, 130, 310, false },
1366                { "rgba16i", GL_RGBA16I, GLSL_TYPE_INT, 130, 310, false },
1367                { "rgba8i", GL_RGBA8I, GLSL_TYPE_INT, 130, 310, false },
1368                { "rg32i", GL_RG32I, GLSL_TYPE_INT, 130, 0, true },
1369                { "rg16i", GL_RG16I, GLSL_TYPE_INT, 130, 0, true },
1370                { "rg8i", GL_RG8I, GLSL_TYPE_INT, 130, 0, true },
1371                { "r32i", GL_R32I, GLSL_TYPE_INT, 130, 310, false },
1372                { "r16i", GL_R16I, GLSL_TYPE_INT, 130, 0, true },
1373                { "r8i", GL_R8I, GLSL_TYPE_INT, 130, 0, true },
1374                { "rgba16", GL_RGBA16, GLSL_TYPE_FLOAT, 130, 0, true },
1375                { "rgb10_a2", GL_RGB10_A2, GLSL_TYPE_FLOAT, 130, 0, true },
1376                { "rgba8", GL_RGBA8, GLSL_TYPE_FLOAT, 130, 310, false },
1377                { "rg16", GL_RG16, GLSL_TYPE_FLOAT, 130, 0, true },
1378                { "rg8", GL_RG8, GLSL_TYPE_FLOAT, 130, 0, true },
1379                { "r16", GL_R16, GLSL_TYPE_FLOAT, 130, 0, true },
1380                { "r8", GL_R8, GLSL_TYPE_FLOAT, 130, 0, true },
1381                { "rgba16_snorm", GL_RGBA16_SNORM, GLSL_TYPE_FLOAT, 130, 0, true },
1382                { "rgba8_snorm", GL_RGBA8_SNORM, GLSL_TYPE_FLOAT, 130, 310, false },
1383                { "rg16_snorm", GL_RG16_SNORM, GLSL_TYPE_FLOAT, 130, 0, true },
1384                { "rg8_snorm", GL_RG8_SNORM, GLSL_TYPE_FLOAT, 130, 0, true },
1385                { "r16_snorm", GL_R16_SNORM, GLSL_TYPE_FLOAT, 130, 0, true },
1386                { "r8_snorm", GL_R8_SNORM, GLSL_TYPE_FLOAT, 130, 0, true }
1387             };
1388
1389             for (unsigned i = 0; i < ARRAY_SIZE(map); i++) {
1390                if ((state->is_version(map[i].required_glsl,
1391                                       map[i].required_essl) ||
1392                     (state->NV_image_formats_enable &&
1393                      map[i].nv_image_formats)) &&
1394                    match_layout_qualifier($1, map[i].name, state) == 0) {
1395                   $$.flags.q.explicit_image_format = 1;
1396                   $$.image_format = map[i].format;
1397                   $$.image_base_type = map[i].base_type;
1398                   break;
1399                }
1400             }
1401          }
1402       }
1403
1404       if (!$$.flags.i) {
1405          if (match_layout_qualifier($1, "early_fragment_tests", state) == 0) {
1406             /* From section 4.4.1.3 of the GLSL 4.50 specification
1407              * (Fragment Shader Inputs):
1408              *
1409              *  "Fragment shaders also allow the following layout
1410              *   qualifier on in only (not with variable declarations)
1411              *     layout-qualifier-id
1412              *        early_fragment_tests
1413              *   [...]"
1414              */
1415             if (state->stage != MESA_SHADER_FRAGMENT) {
1416                _mesa_glsl_error(& @1, state,
1417                                 "early_fragment_tests layout qualifier only "
1418                                 "valid in fragment shaders");
1419             }
1420
1421             $$.flags.q.early_fragment_tests = 1;
1422          }
1423
1424          if (match_layout_qualifier($1, "inner_coverage", state) == 0) {
1425             if (state->stage != MESA_SHADER_FRAGMENT) {
1426                _mesa_glsl_error(& @1, state,
1427                                 "inner_coverage layout qualifier only "
1428                                 "valid in fragment shaders");
1429             }
1430
1431             if (state->INTEL_conservative_rasterization_enable) {
1432                $$.flags.q.inner_coverage = 1;
1433             } else {
1434                _mesa_glsl_error(& @1, state,
1435                                 "inner_coverage layout qualifier present, "
1436                                 "but the INTEL_conservative_rasterization extension "
1437                                 "is not enabled.");
1438             }
1439          }
1440
1441          if (match_layout_qualifier($1, "post_depth_coverage", state) == 0) {
1442             if (state->stage != MESA_SHADER_FRAGMENT) {
1443                _mesa_glsl_error(& @1, state,
1444                                 "post_depth_coverage layout qualifier only "
1445                                 "valid in fragment shaders");
1446             }
1447
1448             if (state->ARB_post_depth_coverage_enable ||
1449                 state->INTEL_conservative_rasterization_enable) {
1450                $$.flags.q.post_depth_coverage = 1;
1451             } else {
1452                _mesa_glsl_error(& @1, state,
1453                                 "post_depth_coverage layout qualifier present, "
1454                                 "but the GL_ARB_post_depth_coverage extension "
1455                                 "is not enabled.");
1456             }
1457          }
1458
1459          if ($$.flags.q.post_depth_coverage && $$.flags.q.inner_coverage) {
1460             _mesa_glsl_error(& @1, state,
1461                              "post_depth_coverage & inner_coverage layout qualifiers "
1462                              "are mutually exclusive");
1463          }
1464       }
1465
1466       const bool pixel_interlock_ordered = match_layout_qualifier($1,
1467          "pixel_interlock_ordered", state) == 0;
1468       const bool pixel_interlock_unordered = match_layout_qualifier($1,
1469          "pixel_interlock_unordered", state) == 0;
1470       const bool sample_interlock_ordered = match_layout_qualifier($1,
1471          "sample_interlock_ordered", state) == 0;
1472       const bool sample_interlock_unordered = match_layout_qualifier($1,
1473          "sample_interlock_unordered", state) == 0;
1474
1475       if (pixel_interlock_ordered + pixel_interlock_unordered +
1476           sample_interlock_ordered + sample_interlock_unordered > 0 &&
1477           state->stage != MESA_SHADER_FRAGMENT) {
1478          _mesa_glsl_error(& @1, state, "interlock layout qualifiers: "
1479                           "pixel_interlock_ordered, pixel_interlock_unordered, "
1480                           "sample_interlock_ordered and sample_interlock_unordered, "
1481                           "only valid in fragment shader input layout declaration.");
1482       } else if (pixel_interlock_ordered + pixel_interlock_unordered +
1483                  sample_interlock_ordered + sample_interlock_unordered > 0 &&
1484                  !state->ARB_fragment_shader_interlock_enable &&
1485                  !state->NV_fragment_shader_interlock_enable) {
1486          _mesa_glsl_error(& @1, state,
1487                           "interlock layout qualifier present, but the "
1488                           "GL_ARB_fragment_shader_interlock or "
1489                           "GL_NV_fragment_shader_interlock extension is not "
1490                           "enabled.");
1491       } else {
1492          $$.flags.q.pixel_interlock_ordered = pixel_interlock_ordered;
1493          $$.flags.q.pixel_interlock_unordered = pixel_interlock_unordered;
1494          $$.flags.q.sample_interlock_ordered = sample_interlock_ordered;
1495          $$.flags.q.sample_interlock_unordered = sample_interlock_unordered;
1496       }
1497
1498       /* Layout qualifiers for tessellation evaluation shaders. */
1499       if (!$$.flags.i) {
1500          static const struct {
1501             const char *s;
1502             GLenum e;
1503          } map[] = {
1504                  /* triangles already parsed by gs-specific code */
1505                  { "quads", GL_QUADS },
1506                  { "isolines", GL_ISOLINES },
1507          };
1508          for (unsigned i = 0; i < ARRAY_SIZE(map); i++) {
1509             if (match_layout_qualifier($1, map[i].s, state) == 0) {
1510                $$.flags.q.prim_type = 1;
1511                $$.prim_type = map[i].e;
1512                break;
1513             }
1514          }
1515
1516          if ($$.flags.i && !state->has_tessellation_shader()) {
1517             _mesa_glsl_error(& @1, state,
1518                              "primitive mode qualifier `%s' requires "
1519                              "GLSL 4.00 or ARB_tessellation_shader", $1);
1520          }
1521       }
1522       if (!$$.flags.i) {
1523          static const struct {
1524             const char *s;
1525             enum gl_tess_spacing e;
1526          } map[] = {
1527                  { "equal_spacing", TESS_SPACING_EQUAL },
1528                  { "fractional_odd_spacing", TESS_SPACING_FRACTIONAL_ODD },
1529                  { "fractional_even_spacing", TESS_SPACING_FRACTIONAL_EVEN },
1530          };
1531          for (unsigned i = 0; i < ARRAY_SIZE(map); i++) {
1532             if (match_layout_qualifier($1, map[i].s, state) == 0) {
1533                $$.flags.q.vertex_spacing = 1;
1534                $$.vertex_spacing = map[i].e;
1535                break;
1536             }
1537          }
1538
1539          if ($$.flags.i && !state->has_tessellation_shader()) {
1540             _mesa_glsl_error(& @1, state,
1541                              "vertex spacing qualifier `%s' requires "
1542                              "GLSL 4.00 or ARB_tessellation_shader", $1);
1543          }
1544       }
1545       if (!$$.flags.i) {
1546          if (match_layout_qualifier($1, "cw", state) == 0) {
1547             $$.flags.q.ordering = 1;
1548             $$.ordering = GL_CW;
1549          } else if (match_layout_qualifier($1, "ccw", state) == 0) {
1550             $$.flags.q.ordering = 1;
1551             $$.ordering = GL_CCW;
1552          }
1553
1554          if ($$.flags.i && !state->has_tessellation_shader()) {
1555             _mesa_glsl_error(& @1, state,
1556                              "ordering qualifier `%s' requires "
1557                              "GLSL 4.00 or ARB_tessellation_shader", $1);
1558          }
1559       }
1560       if (!$$.flags.i) {
1561          if (match_layout_qualifier($1, "point_mode", state) == 0) {
1562             $$.flags.q.point_mode = 1;
1563             $$.point_mode = true;
1564          }
1565
1566          if ($$.flags.i && !state->has_tessellation_shader()) {
1567             _mesa_glsl_error(& @1, state,
1568                              "qualifier `point_mode' requires "
1569                              "GLSL 4.00 or ARB_tessellation_shader");
1570          }
1571       }
1572
1573       if (!$$.flags.i) {
1574          static const struct {
1575             const char *s;
1576             uint32_t mask;
1577          } map[] = {
1578                  { "blend_support_multiply",       BLEND_MULTIPLY },
1579                  { "blend_support_screen",         BLEND_SCREEN },
1580                  { "blend_support_overlay",        BLEND_OVERLAY },
1581                  { "blend_support_darken",         BLEND_DARKEN },
1582                  { "blend_support_lighten",        BLEND_LIGHTEN },
1583                  { "blend_support_colordodge",     BLEND_COLORDODGE },
1584                  { "blend_support_colorburn",      BLEND_COLORBURN },
1585                  { "blend_support_hardlight",      BLEND_HARDLIGHT },
1586                  { "blend_support_softlight",      BLEND_SOFTLIGHT },
1587                  { "blend_support_difference",     BLEND_DIFFERENCE },
1588                  { "blend_support_exclusion",      BLEND_EXCLUSION },
1589                  { "blend_support_hsl_hue",        BLEND_HSL_HUE },
1590                  { "blend_support_hsl_saturation", BLEND_HSL_SATURATION },
1591                  { "blend_support_hsl_color",      BLEND_HSL_COLOR },
1592                  { "blend_support_hsl_luminosity", BLEND_HSL_LUMINOSITY },
1593                  { "blend_support_all_equations",  BLEND_ALL },
1594          };
1595          for (unsigned i = 0; i < ARRAY_SIZE(map); i++) {
1596             if (match_layout_qualifier($1, map[i].s, state) == 0) {
1597                $$.flags.q.blend_support = 1;
1598                state->fs_blend_support |= map[i].mask;
1599                break;
1600             }
1601          }
1602
1603          if ($$.flags.i &&
1604              !state->KHR_blend_equation_advanced_enable &&
1605              !state->is_version(0, 320)) {
1606             _mesa_glsl_error(& @1, state,
1607                              "advanced blending layout qualifiers require "
1608                              "ESSL 3.20 or KHR_blend_equation_advanced");
1609          }
1610
1611          if ($$.flags.i && state->stage != MESA_SHADER_FRAGMENT) {
1612             _mesa_glsl_error(& @1, state,
1613                              "advanced blending layout qualifiers only "
1614                              "valid in fragment shaders");
1615          }
1616       }
1617
1618       /* Layout qualifiers for ARB_compute_variable_group_size. */
1619       if (!$$.flags.i) {
1620          if (match_layout_qualifier($1, "local_size_variable", state) == 0) {
1621             $$.flags.q.local_size_variable = 1;
1622          }
1623
1624          if ($$.flags.i && !state->ARB_compute_variable_group_size_enable) {
1625             _mesa_glsl_error(& @1, state,
1626                              "qualifier `local_size_variable` requires "
1627                              "ARB_compute_variable_group_size");
1628          }
1629       }
1630
1631       /* Layout qualifiers for ARB_bindless_texture. */
1632       if (!$$.flags.i) {
1633          if (match_layout_qualifier($1, "bindless_sampler", state) == 0)
1634             $$.flags.q.bindless_sampler = 1;
1635          if (match_layout_qualifier($1, "bound_sampler", state) == 0)
1636             $$.flags.q.bound_sampler = 1;
1637
1638          if (state->has_shader_image_load_store()) {
1639             if (match_layout_qualifier($1, "bindless_image", state) == 0)
1640                $$.flags.q.bindless_image = 1;
1641             if (match_layout_qualifier($1, "bound_image", state) == 0)
1642                $$.flags.q.bound_image = 1;
1643          }
1644
1645          if ($$.flags.i && !state->has_bindless()) {
1646             _mesa_glsl_error(& @1, state,
1647                              "qualifier `%s` requires "
1648                              "ARB_bindless_texture", $1);
1649          }
1650       }
1651
1652       if (!$$.flags.i &&
1653           state->EXT_shader_framebuffer_fetch_non_coherent_enable) {
1654          if (match_layout_qualifier($1, "noncoherent", state) == 0)
1655             $$.flags.q.non_coherent = 1;
1656       }
1657
1658       // Layout qualifiers for NV_compute_shader_derivatives.
1659       if (!$$.flags.i) {
1660          if (match_layout_qualifier($1, "derivative_group_quadsNV", state) == 0) {
1661             $$.flags.q.derivative_group = 1;
1662             $$.derivative_group = DERIVATIVE_GROUP_QUADS;
1663          } else if (match_layout_qualifier($1, "derivative_group_linearNV", state) == 0) {
1664             $$.flags.q.derivative_group = 1;
1665             $$.derivative_group = DERIVATIVE_GROUP_LINEAR;
1666          }
1667
1668          if ($$.flags.i) {
1669             if (!state->has_compute_shader()) {
1670                _mesa_glsl_error(& @1, state,
1671                                 "qualifier `%s' requires "
1672                                 "a compute shader", $1);
1673             }
1674
1675             if (!state->NV_compute_shader_derivatives_enable) {
1676                _mesa_glsl_error(& @1, state,
1677                                 "qualifier `%s' requires "
1678                                 "NV_compute_shader_derivatives", $1);
1679             }
1680
1681             if (state->NV_compute_shader_derivatives_warn) {
1682                _mesa_glsl_warning(& @1, state,
1683                                   "NV_compute_shader_derivatives layout "
1684                                   "qualifier `%s' used", $1);
1685             }
1686          }
1687       }
1688
1689       if (!$$.flags.i) {
1690          _mesa_glsl_error(& @1, state, "unrecognized layout identifier "
1691                           "`%s'", $1);
1692          YYERROR;
1693       }
1694    }
1695    | any_identifier '=' constant_expression
1696    {
1697       memset(& $$, 0, sizeof($$));
1698       void *ctx = state->linalloc;
1699
1700       if ($3->oper != ast_int_constant &&
1701           $3->oper != ast_uint_constant &&
1702           !state->has_enhanced_layouts()) {
1703          _mesa_glsl_error(& @1, state,
1704                           "compile-time constant expressions require "
1705                           "GLSL 4.40 or ARB_enhanced_layouts");
1706       }
1707
1708       if (match_layout_qualifier("align", $1, state) == 0) {
1709          if (!state->has_enhanced_layouts()) {
1710             _mesa_glsl_error(& @1, state,
1711                              "align qualifier requires "
1712                              "GLSL 4.40 or ARB_enhanced_layouts");
1713          } else {
1714             $$.flags.q.explicit_align = 1;
1715             $$.align = $3;
1716          }
1717       }
1718
1719       if (match_layout_qualifier("location", $1, state) == 0) {
1720          $$.flags.q.explicit_location = 1;
1721
1722          if ($$.flags.q.attribute == 1 &&
1723              state->ARB_explicit_attrib_location_warn) {
1724             _mesa_glsl_warning(& @1, state,
1725                                "GL_ARB_explicit_attrib_location layout "
1726                                "identifier `%s' used", $1);
1727          }
1728          $$.location = $3;
1729       }
1730
1731       if (match_layout_qualifier("component", $1, state) == 0) {
1732          if (!state->has_enhanced_layouts()) {
1733             _mesa_glsl_error(& @1, state,
1734                              "component qualifier requires "
1735                              "GLSL 4.40 or ARB_enhanced_layouts");
1736          } else {
1737             $$.flags.q.explicit_component = 1;
1738             $$.component = $3;
1739          }
1740       }
1741
1742       if (match_layout_qualifier("index", $1, state) == 0) {
1743          if (state->es_shader && !state->EXT_blend_func_extended_enable) {
1744             _mesa_glsl_error(& @3, state, "index layout qualifier requires EXT_blend_func_extended");
1745             YYERROR;
1746          }
1747
1748          $$.flags.q.explicit_index = 1;
1749          $$.index = $3;
1750       }
1751
1752       if ((state->has_420pack_or_es31() ||
1753            state->has_atomic_counters() ||
1754            state->has_shader_storage_buffer_objects()) &&
1755           match_layout_qualifier("binding", $1, state) == 0) {
1756          $$.flags.q.explicit_binding = 1;
1757          $$.binding = $3;
1758       }
1759
1760       if ((state->has_atomic_counters() ||
1761            state->has_enhanced_layouts()) &&
1762           match_layout_qualifier("offset", $1, state) == 0) {
1763          $$.flags.q.explicit_offset = 1;
1764          $$.offset = $3;
1765       }
1766
1767       if (match_layout_qualifier("max_vertices", $1, state) == 0) {
1768          $$.flags.q.max_vertices = 1;
1769          $$.max_vertices = new(ctx) ast_layout_expression(@1, $3);
1770          if (!state->has_geometry_shader()) {
1771             _mesa_glsl_error(& @3, state,
1772                              "#version 150 max_vertices qualifier "
1773                              "specified", $3);
1774          }
1775       }
1776
1777       if (state->stage == MESA_SHADER_GEOMETRY) {
1778          if (match_layout_qualifier("stream", $1, state) == 0 &&
1779              state->check_explicit_attrib_stream_allowed(& @3)) {
1780             $$.flags.q.stream = 1;
1781             $$.flags.q.explicit_stream = 1;
1782             $$.stream = $3;
1783          }
1784       }
1785
1786       if (state->has_enhanced_layouts()) {
1787          if (match_layout_qualifier("xfb_buffer", $1, state) == 0) {
1788             $$.flags.q.xfb_buffer = 1;
1789             $$.flags.q.explicit_xfb_buffer = 1;
1790             $$.xfb_buffer = $3;
1791          }
1792
1793          if (match_layout_qualifier("xfb_offset", $1, state) == 0) {
1794             $$.flags.q.explicit_xfb_offset = 1;
1795             $$.offset = $3;
1796          }
1797
1798          if (match_layout_qualifier("xfb_stride", $1, state) == 0) {
1799             $$.flags.q.xfb_stride = 1;
1800             $$.flags.q.explicit_xfb_stride = 1;
1801             $$.xfb_stride = $3;
1802          }
1803       }
1804
1805       static const char * const local_size_qualifiers[3] = {
1806          "local_size_x",
1807          "local_size_y",
1808          "local_size_z",
1809       };
1810       for (int i = 0; i < 3; i++) {
1811          if (match_layout_qualifier(local_size_qualifiers[i], $1,
1812                                     state) == 0) {
1813             if (!state->has_compute_shader()) {
1814                _mesa_glsl_error(& @3, state,
1815                                 "%s qualifier requires GLSL 4.30 or "
1816                                 "GLSL ES 3.10 or ARB_compute_shader",
1817                                 local_size_qualifiers[i]);
1818                YYERROR;
1819             } else {
1820                $$.flags.q.local_size |= (1 << i);
1821                $$.local_size[i] = new(ctx) ast_layout_expression(@1, $3);
1822             }
1823             break;
1824          }
1825       }
1826
1827       if (match_layout_qualifier("invocations", $1, state) == 0) {
1828          $$.flags.q.invocations = 1;
1829          $$.invocations = new(ctx) ast_layout_expression(@1, $3);
1830          if (!state->is_version(400, 320) &&
1831              !state->ARB_gpu_shader5_enable &&
1832              !state->OES_geometry_shader_enable &&
1833              !state->EXT_geometry_shader_enable) {
1834             _mesa_glsl_error(& @3, state,
1835                              "GL_ARB_gpu_shader5 invocations "
1836                              "qualifier specified", $3);
1837          }
1838       }
1839
1840       /* Layout qualifiers for tessellation control shaders. */
1841       if (match_layout_qualifier("vertices", $1, state) == 0) {
1842          $$.flags.q.vertices = 1;
1843          $$.vertices = new(ctx) ast_layout_expression(@1, $3);
1844          if (!state->has_tessellation_shader()) {
1845             _mesa_glsl_error(& @1, state,
1846                              "vertices qualifier requires GLSL 4.00 or "
1847                              "ARB_tessellation_shader");
1848          }
1849       }
1850
1851       /* If the identifier didn't match any known layout identifiers,
1852        * emit an error.
1853        */
1854       if (!$$.flags.i) {
1855          _mesa_glsl_error(& @1, state, "unrecognized layout identifier "
1856                           "`%s'", $1);
1857          YYERROR;
1858       }
1859    }
1860    | interface_block_layout_qualifier
1861    {
1862       $$ = $1;
1863       /* Layout qualifiers for ARB_uniform_buffer_object. */
1864       if ($$.flags.q.uniform && !state->has_uniform_buffer_objects()) {
1865          _mesa_glsl_error(& @1, state,
1866                           "#version 140 / GL_ARB_uniform_buffer_object "
1867                           "layout qualifier `%s' is used", $1);
1868       } else if ($$.flags.q.uniform && state->ARB_uniform_buffer_object_warn) {
1869          _mesa_glsl_warning(& @1, state,
1870                             "#version 140 / GL_ARB_uniform_buffer_object "
1871                             "layout qualifier `%s' is used", $1);
1872       }
1873    }
1874    ;
1875
1876 /* This is a separate language rule because we parse these as tokens
1877  * (due to them being reserved keywords) instead of identifiers like
1878  * most qualifiers.  See the any_identifier path of
1879  * layout_qualifier_id for the others.
1880  *
1881  * Note that since layout qualifiers are case-insensitive in desktop
1882  * GLSL, all of these qualifiers need to be handled as identifiers as
1883  * well (by the any_identifier path of layout_qualifier_id).
1884  */
1885 interface_block_layout_qualifier:
1886    ROW_MAJOR
1887    {
1888       memset(& $$, 0, sizeof($$));
1889       $$.flags.q.row_major = 1;
1890    }
1891    | PACKED_TOK
1892    {
1893       memset(& $$, 0, sizeof($$));
1894       $$.flags.q.packed = 1;
1895    }
1896    | SHARED
1897    {
1898       memset(& $$, 0, sizeof($$));
1899       $$.flags.q.shared = 1;
1900    }
1901    ;
1902
1903 subroutine_qualifier:
1904    SUBROUTINE
1905    {
1906       memset(& $$, 0, sizeof($$));
1907       $$.flags.q.subroutine = 1;
1908    }
1909    | SUBROUTINE '(' subroutine_type_list ')'
1910    {
1911       memset(& $$, 0, sizeof($$));
1912       $$.flags.q.subroutine = 1;
1913       $$.subroutine_list = $3;
1914    }
1915    ;
1916
1917 subroutine_type_list:
1918    any_identifier
1919    {
1920         void *ctx = state->linalloc;
1921         ast_declaration *decl = new(ctx)  ast_declaration($1, NULL, NULL);
1922         decl->set_location(@1);
1923
1924         $$ = new(ctx) ast_subroutine_list();
1925         $$->declarations.push_tail(&decl->link);
1926    }
1927    | subroutine_type_list ',' any_identifier
1928    {
1929         void *ctx = state->linalloc;
1930         ast_declaration *decl = new(ctx)  ast_declaration($3, NULL, NULL);
1931         decl->set_location(@3);
1932
1933         $$ = $1;
1934         $$->declarations.push_tail(&decl->link);
1935    }
1936    ;
1937
1938 interpolation_qualifier:
1939    SMOOTH
1940    {
1941       memset(& $$, 0, sizeof($$));
1942       $$.flags.q.smooth = 1;
1943    }
1944    | FLAT
1945    {
1946       memset(& $$, 0, sizeof($$));
1947       $$.flags.q.flat = 1;
1948    }
1949    | NOPERSPECTIVE
1950    {
1951       memset(& $$, 0, sizeof($$));
1952       $$.flags.q.noperspective = 1;
1953    }
1954    ;
1955
1956 type_qualifier:
1957    /* Single qualifiers */
1958    INVARIANT
1959    {
1960       memset(& $$, 0, sizeof($$));
1961       $$.flags.q.invariant = 1;
1962    }
1963    | PRECISE
1964    {
1965       memset(& $$, 0, sizeof($$));
1966       $$.flags.q.precise = 1;
1967    }
1968    | auxiliary_storage_qualifier
1969    | storage_qualifier
1970    | interpolation_qualifier
1971    | layout_qualifier
1972    | memory_qualifier
1973    | subroutine_qualifier
1974    | precision_qualifier
1975    {
1976       memset(&$$, 0, sizeof($$));
1977       $$.precision = $1;
1978    }
1979
1980    /* Multiple qualifiers:
1981     * In GLSL 4.20, these can be specified in any order.  In earlier versions,
1982     * they appear in this order (see GLSL 1.50 section 4.7 & comments below):
1983     *
1984     *    invariant interpolation auxiliary storage precision  ...or...
1985     *    layout storage precision
1986     *
1987     * Each qualifier's rule ensures that the accumulated qualifiers on the right
1988     * side don't contain any that must appear on the left hand side.
1989     * For example, when processing a storage qualifier, we check that there are
1990     * no auxiliary, interpolation, layout, invariant, or precise qualifiers to the right.
1991     */
1992    | PRECISE type_qualifier
1993    {
1994       if ($2.flags.q.precise)
1995          _mesa_glsl_error(&@1, state, "duplicate \"precise\" qualifier");
1996
1997       $$ = $2;
1998       $$.flags.q.precise = 1;
1999    }
2000    | INVARIANT type_qualifier
2001    {
2002       if ($2.flags.q.invariant)
2003          _mesa_glsl_error(&@1, state, "duplicate \"invariant\" qualifier");
2004
2005       if (!state->has_420pack_or_es31() && $2.flags.q.precise)
2006          _mesa_glsl_error(&@1, state,
2007                           "\"invariant\" must come after \"precise\"");
2008
2009       $$ = $2;
2010       $$.flags.q.invariant = 1;
2011
2012       /* GLSL ES 3.00 spec, section 4.6.1 "The Invariant Qualifier":
2013        *
2014        * "Only variables output from a shader can be candidates for invariance.
2015        * This includes user-defined output variables and the built-in output
2016        * variables. As only outputs can be declared as invariant, an invariant
2017        * output from one shader stage will still match an input of a subsequent
2018        * stage without the input being declared as invariant."
2019        *
2020        * On the desktop side, this text first appears in GLSL 4.30.
2021        */
2022       if (state->is_version(430, 300) && $$.flags.q.in)
2023          _mesa_glsl_error(&@1, state, "invariant qualifiers cannot be used with shader inputs");
2024    }
2025    | interpolation_qualifier type_qualifier
2026    {
2027       /* Section 4.3 of the GLSL 1.40 specification states:
2028        * "...qualified with one of these interpolation qualifiers"
2029        *
2030        * GLSL 1.30 claims to allow "one or more", but insists that:
2031        * "These interpolation qualifiers may only precede the qualifiers in,
2032        *  centroid in, out, or centroid out in a declaration."
2033        *
2034        * ...which means that e.g. smooth can't precede smooth, so there can be
2035        * only one after all, and the 1.40 text is a clarification, not a change.
2036        */
2037       if ($2.has_interpolation())
2038          _mesa_glsl_error(&@1, state, "duplicate interpolation qualifier");
2039
2040       if (!state->has_420pack_or_es31() &&
2041           ($2.flags.q.precise || $2.flags.q.invariant)) {
2042          _mesa_glsl_error(&@1, state, "interpolation qualifiers must come "
2043                           "after \"precise\" or \"invariant\"");
2044       }
2045
2046       $$ = $1;
2047       $$.merge_qualifier(&@1, state, $2, false);
2048    }
2049    | layout_qualifier type_qualifier
2050    {
2051       /* In the absence of ARB_shading_language_420pack, layout qualifiers may
2052        * appear no later than auxiliary storage qualifiers. There is no
2053        * particularly clear spec language mandating this, but in all examples
2054        * the layout qualifier precedes the storage qualifier.
2055        *
2056        * We allow combinations of layout with interpolation, invariant or
2057        * precise qualifiers since these are useful in ARB_separate_shader_objects.
2058        * There is no clear spec guidance on this either.
2059        */
2060       $$ = $1;
2061       $$.merge_qualifier(& @1, state, $2, false, $2.has_layout());
2062    }
2063    | subroutine_qualifier type_qualifier
2064    {
2065       $$ = $1;
2066       $$.merge_qualifier(&@1, state, $2, false);
2067    }
2068    | auxiliary_storage_qualifier type_qualifier
2069    {
2070       if ($2.has_auxiliary_storage()) {
2071          _mesa_glsl_error(&@1, state,
2072                           "duplicate auxiliary storage qualifier (centroid or sample)");
2073       }
2074
2075       if ((!state->has_420pack_or_es31() && !state->EXT_gpu_shader4_enable) &&
2076           ($2.flags.q.precise || $2.flags.q.invariant ||
2077            $2.has_interpolation() || $2.has_layout())) {
2078          _mesa_glsl_error(&@1, state, "auxiliary storage qualifiers must come "
2079                           "just before storage qualifiers");
2080       }
2081       $$ = $1;
2082       $$.merge_qualifier(&@1, state, $2, false);
2083    }
2084    | storage_qualifier type_qualifier
2085    {
2086       /* Section 4.3 of the GLSL 1.20 specification states:
2087        * "Variable declarations may have a storage qualifier specified..."
2088        *  1.30 clarifies this to "may have one storage qualifier".
2089        *
2090        * GL_EXT_gpu_shader4 allows "varying out" in fragment shaders.
2091        */
2092       if ($2.has_storage() &&
2093           (!state->EXT_gpu_shader4_enable ||
2094            state->stage != MESA_SHADER_FRAGMENT ||
2095            !$1.flags.q.varying || !$2.flags.q.out))
2096          _mesa_glsl_error(&@1, state, "duplicate storage qualifier");
2097
2098       if (!state->has_420pack_or_es31() &&
2099           ($2.flags.q.precise || $2.flags.q.invariant || $2.has_interpolation() ||
2100            $2.has_layout() || $2.has_auxiliary_storage())) {
2101          _mesa_glsl_error(&@1, state, "storage qualifiers must come after "
2102                           "precise, invariant, interpolation, layout and auxiliary "
2103                           "storage qualifiers");
2104       }
2105
2106       $$ = $1;
2107       $$.merge_qualifier(&@1, state, $2, false);
2108    }
2109    | precision_qualifier type_qualifier
2110    {
2111       if ($2.precision != ast_precision_none)
2112          _mesa_glsl_error(&@1, state, "duplicate precision qualifier");
2113
2114       if (!(state->has_420pack_or_es31()) &&
2115           $2.flags.i != 0)
2116          _mesa_glsl_error(&@1, state, "precision qualifiers must come last");
2117
2118       $$ = $2;
2119       $$.precision = $1;
2120    }
2121    | memory_qualifier type_qualifier
2122    {
2123       $$ = $1;
2124       $$.merge_qualifier(&@1, state, $2, false);
2125    }
2126    ;
2127
2128 auxiliary_storage_qualifier:
2129    CENTROID
2130    {
2131       memset(& $$, 0, sizeof($$));
2132       $$.flags.q.centroid = 1;
2133    }
2134    | SAMPLE
2135    {
2136       memset(& $$, 0, sizeof($$));
2137       $$.flags.q.sample = 1;
2138    }
2139    | PATCH
2140    {
2141       memset(& $$, 0, sizeof($$));
2142       $$.flags.q.patch = 1;
2143    }
2144
2145 storage_qualifier:
2146    CONST_TOK
2147    {
2148       memset(& $$, 0, sizeof($$));
2149       $$.flags.q.constant = 1;
2150    }
2151    | ATTRIBUTE
2152    {
2153       memset(& $$, 0, sizeof($$));
2154       $$.flags.q.attribute = 1;
2155    }
2156    | VARYING
2157    {
2158       memset(& $$, 0, sizeof($$));
2159       $$.flags.q.varying = 1;
2160    }
2161    | IN_TOK
2162    {
2163       memset(& $$, 0, sizeof($$));
2164       $$.flags.q.in = 1;
2165    }
2166    | OUT_TOK
2167    {
2168       memset(& $$, 0, sizeof($$));
2169       $$.flags.q.out = 1;
2170
2171       if (state->stage == MESA_SHADER_GEOMETRY &&
2172           state->has_explicit_attrib_stream()) {
2173          /* Section 4.3.8.2 (Output Layout Qualifiers) of the GLSL 4.00
2174           * spec says:
2175           *
2176           *     "If the block or variable is declared with the stream
2177           *     identifier, it is associated with the specified stream;
2178           *     otherwise, it is associated with the current default stream."
2179           */
2180           $$.flags.q.stream = 1;
2181           $$.flags.q.explicit_stream = 0;
2182           $$.stream = state->out_qualifier->stream;
2183       }
2184
2185       if (state->has_enhanced_layouts()) {
2186           $$.flags.q.xfb_buffer = 1;
2187           $$.flags.q.explicit_xfb_buffer = 0;
2188           $$.xfb_buffer = state->out_qualifier->xfb_buffer;
2189       }
2190    }
2191    | INOUT_TOK
2192    {
2193       memset(& $$, 0, sizeof($$));
2194       $$.flags.q.in = 1;
2195       $$.flags.q.out = 1;
2196
2197       if (!state->has_framebuffer_fetch() ||
2198           !state->is_version(130, 300) ||
2199           state->stage != MESA_SHADER_FRAGMENT)
2200          _mesa_glsl_error(&@1, state, "A single interface variable cannot be "
2201                           "declared as both input and output");
2202    }
2203    | UNIFORM
2204    {
2205       memset(& $$, 0, sizeof($$));
2206       $$.flags.q.uniform = 1;
2207    }
2208    | BUFFER
2209    {
2210       memset(& $$, 0, sizeof($$));
2211       $$.flags.q.buffer = 1;
2212    }
2213    | SHARED
2214    {
2215       memset(& $$, 0, sizeof($$));
2216       $$.flags.q.shared_storage = 1;
2217    }
2218    ;
2219
2220 memory_qualifier:
2221    COHERENT
2222    {
2223       memset(& $$, 0, sizeof($$));
2224       $$.flags.q.coherent = 1;
2225    }
2226    | VOLATILE
2227    {
2228       memset(& $$, 0, sizeof($$));
2229       $$.flags.q._volatile = 1;
2230    }
2231    | RESTRICT
2232    {
2233       STATIC_ASSERT(sizeof($$.flags.q) <= sizeof($$.flags.i));
2234       memset(& $$, 0, sizeof($$));
2235       $$.flags.q.restrict_flag = 1;
2236    }
2237    | READONLY
2238    {
2239       memset(& $$, 0, sizeof($$));
2240       $$.flags.q.read_only = 1;
2241    }
2242    | WRITEONLY
2243    {
2244       memset(& $$, 0, sizeof($$));
2245       $$.flags.q.write_only = 1;
2246    }
2247    ;
2248
2249 array_specifier:
2250    '[' ']'
2251    {
2252       void *ctx = state->linalloc;
2253       $$ = new(ctx) ast_array_specifier(@1, new(ctx) ast_expression(
2254                                                   ast_unsized_array_dim, NULL,
2255                                                   NULL, NULL));
2256       $$->set_location_range(@1, @2);
2257    }
2258    | '[' constant_expression ']'
2259    {
2260       void *ctx = state->linalloc;
2261       $$ = new(ctx) ast_array_specifier(@1, $2);
2262       $$->set_location_range(@1, @3);
2263    }
2264    | array_specifier '[' ']'
2265    {
2266       void *ctx = state->linalloc;
2267       $$ = $1;
2268
2269       if (state->check_arrays_of_arrays_allowed(& @1)) {
2270          $$->add_dimension(new(ctx) ast_expression(ast_unsized_array_dim, NULL,
2271                                                    NULL, NULL));
2272       }
2273    }
2274    | array_specifier '[' constant_expression ']'
2275    {
2276       $$ = $1;
2277
2278       if (state->check_arrays_of_arrays_allowed(& @1)) {
2279          $$->add_dimension($3);
2280       }
2281    }
2282    ;
2283
2284 type_specifier:
2285    type_specifier_nonarray
2286    | type_specifier_nonarray array_specifier
2287    {
2288       $$ = $1;
2289       $$->array_specifier = $2;
2290    }
2291    ;
2292
2293 type_specifier_nonarray:
2294    basic_type_specifier_nonarray
2295    {
2296       void *ctx = state->linalloc;
2297       $$ = new(ctx) ast_type_specifier($1);
2298       $$->set_location(@1);
2299    }
2300    | struct_specifier
2301    {
2302       void *ctx = state->linalloc;
2303       $$ = new(ctx) ast_type_specifier($1);
2304       $$->set_location(@1);
2305    }
2306    | TYPE_IDENTIFIER
2307    {
2308       void *ctx = state->linalloc;
2309       $$ = new(ctx) ast_type_specifier($1);
2310       $$->set_location(@1);
2311    }
2312    ;
2313
2314 basic_type_specifier_nonarray:
2315    VOID_TOK                 { $$ = glsl_type::void_type; }
2316    | BASIC_TYPE_TOK         { $$ = $1; }
2317    | UNSIGNED BASIC_TYPE_TOK
2318    {
2319       if ($2 == glsl_type::int_type) {
2320          $$ = glsl_type::uint_type;
2321       } else {
2322          _mesa_glsl_error(&@1, state,
2323                           "\"unsigned\" is only allowed before \"int\"");
2324       }
2325    }
2326    ;
2327
2328 precision_qualifier:
2329    HIGHP
2330    {
2331       state->check_precision_qualifiers_allowed(&@1);
2332       $$ = ast_precision_high;
2333    }
2334    | MEDIUMP
2335    {
2336       state->check_precision_qualifiers_allowed(&@1);
2337       $$ = ast_precision_medium;
2338    }
2339    | LOWP
2340    {
2341       state->check_precision_qualifiers_allowed(&@1);
2342       $$ = ast_precision_low;
2343    }
2344    ;
2345
2346 struct_specifier:
2347    STRUCT any_identifier '{' struct_declaration_list '}'
2348    {
2349       void *ctx = state->linalloc;
2350       $$ = new(ctx) ast_struct_specifier($2, $4);
2351       $$->set_location_range(@2, @5);
2352       state->symbols->add_type($2, glsl_type::void_type);
2353    }
2354    | STRUCT '{' struct_declaration_list '}'
2355    {
2356       void *ctx = state->linalloc;
2357
2358       /* All anonymous structs have the same name. This simplifies matching of
2359        * globals whose type is an unnamed struct.
2360        *
2361        * It also avoids a memory leak when the same shader is compiled over and
2362        * over again.
2363        */
2364       $$ = new(ctx) ast_struct_specifier("#anon_struct", $3);
2365
2366       $$->set_location_range(@2, @4);
2367    }
2368    ;
2369
2370 struct_declaration_list:
2371    struct_declaration
2372    {
2373       $$ = $1;
2374       $1->link.self_link();
2375    }
2376    | struct_declaration_list struct_declaration
2377    {
2378       $$ = $1;
2379       $$->link.insert_before(& $2->link);
2380    }
2381    ;
2382
2383 struct_declaration:
2384    fully_specified_type struct_declarator_list ';'
2385    {
2386       void *ctx = state->linalloc;
2387       ast_fully_specified_type *const type = $1;
2388       type->set_location(@1);
2389
2390       if (state->has_bindless()) {
2391          ast_type_qualifier input_layout_mask;
2392
2393          /* Allow to declare qualifiers for images. */
2394          input_layout_mask.flags.i = 0;
2395          input_layout_mask.flags.q.coherent = 1;
2396          input_layout_mask.flags.q._volatile = 1;
2397          input_layout_mask.flags.q.restrict_flag = 1;
2398          input_layout_mask.flags.q.read_only = 1;
2399          input_layout_mask.flags.q.write_only = 1;
2400          input_layout_mask.flags.q.explicit_image_format = 1;
2401
2402          if ((type->qualifier.flags.i & ~input_layout_mask.flags.i) != 0) {
2403             _mesa_glsl_error(&@1, state,
2404                              "only precision and image qualifiers may be "
2405                              "applied to structure members");
2406          }
2407       } else {
2408          if (type->qualifier.flags.i != 0)
2409             _mesa_glsl_error(&@1, state,
2410                              "only precision qualifiers may be applied to "
2411                              "structure members");
2412       }
2413
2414       $$ = new(ctx) ast_declarator_list(type);
2415       $$->set_location(@2);
2416
2417       $$->declarations.push_degenerate_list_at_head(& $2->link);
2418    }
2419    ;
2420
2421 struct_declarator_list:
2422    struct_declarator
2423    {
2424       $$ = $1;
2425       $1->link.self_link();
2426    }
2427    | struct_declarator_list ',' struct_declarator
2428    {
2429       $$ = $1;
2430       $$->link.insert_before(& $3->link);
2431    }
2432    ;
2433
2434 struct_declarator:
2435    any_identifier
2436    {
2437       void *ctx = state->linalloc;
2438       $$ = new(ctx) ast_declaration($1, NULL, NULL);
2439       $$->set_location(@1);
2440    }
2441    | any_identifier array_specifier
2442    {
2443       void *ctx = state->linalloc;
2444       $$ = new(ctx) ast_declaration($1, $2, NULL);
2445       $$->set_location_range(@1, @2);
2446    }
2447    ;
2448
2449 initializer:
2450    assignment_expression
2451    | '{' initializer_list '}'
2452    {
2453       $$ = $2;
2454    }
2455    | '{' initializer_list ',' '}'
2456    {
2457       $$ = $2;
2458    }
2459    ;
2460
2461 initializer_list:
2462    initializer
2463    {
2464       void *ctx = state->linalloc;
2465       $$ = new(ctx) ast_aggregate_initializer();
2466       $$->set_location(@1);
2467       $$->expressions.push_tail(& $1->link);
2468    }
2469    | initializer_list ',' initializer
2470    {
2471       $1->expressions.push_tail(& $3->link);
2472    }
2473    ;
2474
2475 declaration_statement:
2476    declaration
2477    ;
2478
2479    // Grammar Note: labeled statements for SWITCH only; 'goto' is not
2480    // supported.
2481 statement:
2482    compound_statement        { $$ = (ast_node *) $1; }
2483    | simple_statement
2484    ;
2485
2486 simple_statement:
2487    declaration_statement
2488    | expression_statement
2489    | selection_statement
2490    | switch_statement
2491    | iteration_statement
2492    | jump_statement
2493    ;
2494
2495 compound_statement:
2496    '{' '}'
2497    {
2498       void *ctx = state->linalloc;
2499       $$ = new(ctx) ast_compound_statement(true, NULL);
2500       $$->set_location_range(@1, @2);
2501    }
2502    | '{'
2503    {
2504       state->symbols->push_scope();
2505    }
2506    statement_list '}'
2507    {
2508       void *ctx = state->linalloc;
2509       $$ = new(ctx) ast_compound_statement(true, $3);
2510       $$->set_location_range(@1, @4);
2511       state->symbols->pop_scope();
2512    }
2513    ;
2514
2515 statement_no_new_scope:
2516    compound_statement_no_new_scope { $$ = (ast_node *) $1; }
2517    | simple_statement
2518    ;
2519
2520 compound_statement_no_new_scope:
2521    '{' '}'
2522    {
2523       void *ctx = state->linalloc;
2524       $$ = new(ctx) ast_compound_statement(false, NULL);
2525       $$->set_location_range(@1, @2);
2526    }
2527    | '{' statement_list '}'
2528    {
2529       void *ctx = state->linalloc;
2530       $$ = new(ctx) ast_compound_statement(false, $2);
2531       $$->set_location_range(@1, @3);
2532    }
2533    ;
2534
2535 statement_list:
2536    statement
2537    {
2538       if ($1 == NULL) {
2539          _mesa_glsl_error(& @1, state, "<nil> statement");
2540          assert($1 != NULL);
2541       }
2542
2543       $$ = $1;
2544       $$->link.self_link();
2545    }
2546    | statement_list statement
2547    {
2548       if ($2 == NULL) {
2549          _mesa_glsl_error(& @2, state, "<nil> statement");
2550          assert($2 != NULL);
2551       }
2552       $$ = $1;
2553       $$->link.insert_before(& $2->link);
2554    }
2555    | statement_list extension_statement
2556    {
2557       if (!state->allow_extension_directive_midshader) {
2558          _mesa_glsl_error(& @1, state,
2559                           "#extension directive is not allowed "
2560                           "in the middle of a shader");
2561          YYERROR;
2562       }
2563    }
2564    ;
2565
2566 expression_statement:
2567    ';'
2568    {
2569       void *ctx = state->linalloc;
2570       $$ = new(ctx) ast_expression_statement(NULL);
2571       $$->set_location(@1);
2572    }
2573    | expression ';'
2574    {
2575       void *ctx = state->linalloc;
2576       $$ = new(ctx) ast_expression_statement($1);
2577       $$->set_location(@1);
2578    }
2579    ;
2580
2581 selection_statement:
2582    IF '(' expression ')' selection_rest_statement
2583    {
2584       $$ = new(state->linalloc) ast_selection_statement($3, $5.then_statement,
2585                                                         $5.else_statement);
2586       $$->set_location_range(@1, @5);
2587    }
2588    ;
2589
2590 selection_rest_statement:
2591    statement ELSE statement
2592    {
2593       $$.then_statement = $1;
2594       $$.else_statement = $3;
2595    }
2596    | statement %prec THEN
2597    {
2598       $$.then_statement = $1;
2599       $$.else_statement = NULL;
2600    }
2601    ;
2602
2603 condition:
2604    expression
2605    {
2606       $$ = (ast_node *) $1;
2607    }
2608    | fully_specified_type any_identifier '=' initializer
2609    {
2610       void *ctx = state->linalloc;
2611       ast_declaration *decl = new(ctx) ast_declaration($2, NULL, $4);
2612       ast_declarator_list *declarator = new(ctx) ast_declarator_list($1);
2613       decl->set_location_range(@2, @4);
2614       declarator->set_location(@1);
2615
2616       declarator->declarations.push_tail(&decl->link);
2617       $$ = declarator;
2618    }
2619    ;
2620
2621 /*
2622  * switch_statement grammar is based on the syntax described in the body
2623  * of the GLSL spec, not in it's appendix!!!
2624  */
2625 switch_statement:
2626    SWITCH '(' expression ')' switch_body
2627    {
2628       $$ = new(state->linalloc) ast_switch_statement($3, $5);
2629       $$->set_location_range(@1, @5);
2630    }
2631    ;
2632
2633 switch_body:
2634    '{' '}'
2635    {
2636       $$ = new(state->linalloc) ast_switch_body(NULL);
2637       $$->set_location_range(@1, @2);
2638    }
2639    | '{' case_statement_list '}'
2640    {
2641       $$ = new(state->linalloc) ast_switch_body($2);
2642       $$->set_location_range(@1, @3);
2643    }
2644    ;
2645
2646 case_label:
2647    CASE expression ':'
2648    {
2649       $$ = new(state->linalloc) ast_case_label($2);
2650       $$->set_location(@2);
2651    }
2652    | DEFAULT ':'
2653    {
2654       $$ = new(state->linalloc) ast_case_label(NULL);
2655       $$->set_location(@2);
2656    }
2657    ;
2658
2659 case_label_list:
2660    case_label
2661    {
2662       ast_case_label_list *labels = new(state->linalloc) ast_case_label_list();
2663
2664       labels->labels.push_tail(& $1->link);
2665       $$ = labels;
2666       $$->set_location(@1);
2667    }
2668    | case_label_list case_label
2669    {
2670       $$ = $1;
2671       $$->labels.push_tail(& $2->link);
2672    }
2673    ;
2674
2675 case_statement:
2676    case_label_list statement
2677    {
2678       ast_case_statement *stmts = new(state->linalloc) ast_case_statement($1);
2679       stmts->set_location(@2);
2680
2681       stmts->stmts.push_tail(& $2->link);
2682       $$ = stmts;
2683    }
2684    | case_statement statement
2685    {
2686       $$ = $1;
2687       $$->stmts.push_tail(& $2->link);
2688    }
2689    ;
2690
2691 case_statement_list:
2692    case_statement
2693    {
2694       ast_case_statement_list *cases= new(state->linalloc) ast_case_statement_list();
2695       cases->set_location(@1);
2696
2697       cases->cases.push_tail(& $1->link);
2698       $$ = cases;
2699    }
2700    | case_statement_list case_statement
2701    {
2702       $$ = $1;
2703       $$->cases.push_tail(& $2->link);
2704    }
2705    ;
2706
2707 iteration_statement:
2708    WHILE '(' condition ')' statement_no_new_scope
2709    {
2710       void *ctx = state->linalloc;
2711       $$ = new(ctx) ast_iteration_statement(ast_iteration_statement::ast_while,
2712                                             NULL, $3, NULL, $5);
2713       $$->set_location_range(@1, @4);
2714    }
2715    | DO statement WHILE '(' expression ')' ';'
2716    {
2717       void *ctx = state->linalloc;
2718       $$ = new(ctx) ast_iteration_statement(ast_iteration_statement::ast_do_while,
2719                                             NULL, $5, NULL, $2);
2720       $$->set_location_range(@1, @6);
2721    }
2722    | FOR '(' for_init_statement for_rest_statement ')' statement_no_new_scope
2723    {
2724       void *ctx = state->linalloc;
2725       $$ = new(ctx) ast_iteration_statement(ast_iteration_statement::ast_for,
2726                                             $3, $4.cond, $4.rest, $6);
2727       $$->set_location_range(@1, @6);
2728    }
2729    ;
2730
2731 for_init_statement:
2732    expression_statement
2733    | declaration_statement
2734    ;
2735
2736 conditionopt:
2737    condition
2738    | /* empty */
2739    {
2740       $$ = NULL;
2741    }
2742    ;
2743
2744 for_rest_statement:
2745    conditionopt ';'
2746    {
2747       $$.cond = $1;
2748       $$.rest = NULL;
2749    }
2750    | conditionopt ';' expression
2751    {
2752       $$.cond = $1;
2753       $$.rest = $3;
2754    }
2755    ;
2756
2757    // Grammar Note: No 'goto'. Gotos are not supported.
2758 jump_statement:
2759    CONTINUE ';'
2760    {
2761       void *ctx = state->linalloc;
2762       $$ = new(ctx) ast_jump_statement(ast_jump_statement::ast_continue, NULL);
2763       $$->set_location(@1);
2764    }
2765    | BREAK ';'
2766    {
2767       void *ctx = state->linalloc;
2768       $$ = new(ctx) ast_jump_statement(ast_jump_statement::ast_break, NULL);
2769       $$->set_location(@1);
2770    }
2771    | RETURN ';'
2772    {
2773       void *ctx = state->linalloc;
2774       $$ = new(ctx) ast_jump_statement(ast_jump_statement::ast_return, NULL);
2775       $$->set_location(@1);
2776    }
2777    | RETURN expression ';'
2778    {
2779       void *ctx = state->linalloc;
2780       $$ = new(ctx) ast_jump_statement(ast_jump_statement::ast_return, $2);
2781       $$->set_location_range(@1, @2);
2782    }
2783    | DISCARD ';' // Fragment shader only.
2784    {
2785       void *ctx = state->linalloc;
2786       $$ = new(ctx) ast_jump_statement(ast_jump_statement::ast_discard, NULL);
2787       $$->set_location(@1);
2788    }
2789    ;
2790
2791 external_declaration:
2792    function_definition      { $$ = $1; }
2793    | declaration            { $$ = $1; }
2794    | pragma_statement       { $$ = $1; }
2795    | layout_defaults        { $$ = $1; }
2796    | ';'                    { $$ = NULL; }
2797    ;
2798
2799 function_definition:
2800    function_prototype compound_statement_no_new_scope
2801    {
2802       void *ctx = state->linalloc;
2803       $$ = new(ctx) ast_function_definition();
2804       $$->set_location_range(@1, @2);
2805       $$->prototype = $1;
2806       $$->body = $2;
2807
2808       state->symbols->pop_scope();
2809    }
2810    ;
2811
2812 /* layout_qualifieropt is packed into this rule */
2813 interface_block:
2814    basic_interface_block
2815    {
2816       $$ = $1;
2817    }
2818    | layout_qualifier interface_block
2819    {
2820       ast_interface_block *block = (ast_interface_block *) $2;
2821
2822       if (!$1.merge_qualifier(& @1, state, block->layout, false,
2823                               block->layout.has_layout())) {
2824          YYERROR;
2825       }
2826
2827       block->layout = $1;
2828
2829       $$ = block;
2830    }
2831    | memory_qualifier interface_block
2832    {
2833       ast_interface_block *block = (ast_interface_block *)$2;
2834
2835       if (!block->default_layout.flags.q.buffer) {
2836             _mesa_glsl_error(& @1, state,
2837                              "memory qualifiers can only be used in the "
2838                              "declaration of shader storage blocks");
2839       }
2840       if (!$1.merge_qualifier(& @1, state, block->layout, false)) {
2841          YYERROR;
2842       }
2843       block->layout = $1;
2844       $$ = block;
2845    }
2846    ;
2847
2848 basic_interface_block:
2849    interface_qualifier NEW_IDENTIFIER '{' member_list '}' instance_name_opt ';'
2850    {
2851       ast_interface_block *const block = $6;
2852
2853       if ($1.flags.q.uniform) {
2854          block->default_layout = *state->default_uniform_qualifier;
2855       } else if ($1.flags.q.buffer) {
2856          block->default_layout = *state->default_shader_storage_qualifier;
2857       }
2858       block->block_name = $2;
2859       block->declarations.push_degenerate_list_at_head(& $4->link);
2860
2861       _mesa_ast_process_interface_block(& @1, state, block, $1);
2862
2863       $$ = block;
2864    }
2865    ;
2866
2867 interface_qualifier:
2868    IN_TOK
2869    {
2870       memset(& $$, 0, sizeof($$));
2871       $$.flags.q.in = 1;
2872    }
2873    | OUT_TOK
2874    {
2875       memset(& $$, 0, sizeof($$));
2876       $$.flags.q.out = 1;
2877    }
2878    | UNIFORM
2879    {
2880       memset(& $$, 0, sizeof($$));
2881       $$.flags.q.uniform = 1;
2882    }
2883    | BUFFER
2884    {
2885       memset(& $$, 0, sizeof($$));
2886       $$.flags.q.buffer = 1;
2887    }
2888    | auxiliary_storage_qualifier interface_qualifier
2889    {
2890       if (!$1.flags.q.patch) {
2891          _mesa_glsl_error(&@1, state, "invalid interface qualifier");
2892       }
2893       if ($2.has_auxiliary_storage()) {
2894          _mesa_glsl_error(&@1, state, "duplicate patch qualifier");
2895       }
2896       $$ = $2;
2897       $$.flags.q.patch = 1;
2898    }
2899    ;
2900
2901 instance_name_opt:
2902    /* empty */
2903    {
2904       $$ = new(state->linalloc) ast_interface_block(NULL, NULL);
2905    }
2906    | NEW_IDENTIFIER
2907    {
2908       $$ = new(state->linalloc) ast_interface_block($1, NULL);
2909       $$->set_location(@1);
2910    }
2911    | NEW_IDENTIFIER array_specifier
2912    {
2913       $$ = new(state->linalloc) ast_interface_block($1, $2);
2914       $$->set_location_range(@1, @2);
2915    }
2916    ;
2917
2918 member_list:
2919    member_declaration
2920    {
2921       $$ = $1;
2922       $1->link.self_link();
2923    }
2924    | member_declaration member_list
2925    {
2926       $$ = $1;
2927       $2->link.insert_before(& $$->link);
2928    }
2929    ;
2930
2931 member_declaration:
2932    fully_specified_type struct_declarator_list ';'
2933    {
2934       void *ctx = state->linalloc;
2935       ast_fully_specified_type *type = $1;
2936       type->set_location(@1);
2937
2938       if (type->qualifier.flags.q.attribute) {
2939          _mesa_glsl_error(& @1, state,
2940                           "keyword 'attribute' cannot be used with "
2941                           "interface block member");
2942       } else if (type->qualifier.flags.q.varying) {
2943          _mesa_glsl_error(& @1, state,
2944                           "keyword 'varying' cannot be used with "
2945                           "interface block member");
2946       }
2947
2948       $$ = new(ctx) ast_declarator_list(type);
2949       $$->set_location(@2);
2950
2951       $$->declarations.push_degenerate_list_at_head(& $2->link);
2952    }
2953    ;
2954
2955 layout_uniform_defaults:
2956    layout_qualifier layout_uniform_defaults
2957    {
2958       $$ = $1;
2959       if (!$$.merge_qualifier(& @1, state, $2, false, true)) {
2960          YYERROR;
2961       }
2962    }
2963    | layout_qualifier UNIFORM ';'
2964    ;
2965
2966 layout_buffer_defaults:
2967    layout_qualifier layout_buffer_defaults
2968    {
2969       $$ = $1;
2970       if (!$$.merge_qualifier(& @1, state, $2, false, true)) {
2971          YYERROR;
2972       }
2973    }
2974    | layout_qualifier BUFFER ';'
2975    ;
2976
2977 layout_in_defaults:
2978    layout_qualifier layout_in_defaults
2979    {
2980       $$ = $1;
2981       if (!$$.merge_qualifier(& @1, state, $2, false, true)) {
2982          YYERROR;
2983       }
2984       if (!$$.validate_in_qualifier(& @1, state)) {
2985          YYERROR;
2986       }
2987    }
2988    | layout_qualifier IN_TOK ';'
2989    {
2990       if (!$1.validate_in_qualifier(& @1, state)) {
2991          YYERROR;
2992       }
2993    }
2994    ;
2995
2996 layout_out_defaults:
2997    layout_qualifier layout_out_defaults
2998    {
2999       $$ = $1;
3000       if (!$$.merge_qualifier(& @1, state, $2, false, true)) {
3001          YYERROR;
3002       }
3003       if (!$$.validate_out_qualifier(& @1, state)) {
3004          YYERROR;
3005       }
3006    }
3007    | layout_qualifier OUT_TOK ';'
3008    {
3009       if (!$1.validate_out_qualifier(& @1, state)) {
3010          YYERROR;
3011       }
3012    }
3013    ;
3014
3015 layout_defaults:
3016    layout_uniform_defaults
3017    {
3018       $$ = NULL;
3019       if (!state->default_uniform_qualifier->
3020              merge_qualifier(& @1, state, $1, false)) {
3021          YYERROR;
3022       }
3023       if (!state->default_uniform_qualifier->
3024              push_to_global(& @1, state)) {
3025          YYERROR;
3026       }
3027    }
3028    | layout_buffer_defaults
3029    {
3030       $$ = NULL;
3031       if (!state->default_shader_storage_qualifier->
3032              merge_qualifier(& @1, state, $1, false)) {
3033          YYERROR;
3034       }
3035       if (!state->default_shader_storage_qualifier->
3036              push_to_global(& @1, state)) {
3037          YYERROR;
3038       }
3039
3040       /* From the GLSL 4.50 spec, section 4.4.5:
3041        *
3042        *     "It is a compile-time error to specify the binding identifier for
3043        *     the global scope or for block member declarations."
3044        */
3045       if (state->default_shader_storage_qualifier->flags.q.explicit_binding) {
3046          _mesa_glsl_error(& @1, state,
3047                           "binding qualifier cannot be set for default layout");
3048       }
3049    }
3050    | layout_in_defaults
3051    {
3052       $$ = NULL;
3053       if (!$1.merge_into_in_qualifier(& @1, state, $$)) {
3054          YYERROR;
3055       }
3056       if (!state->in_qualifier->push_to_global(& @1, state)) {
3057          YYERROR;
3058       }
3059    }
3060    | layout_out_defaults
3061    {
3062       $$ = NULL;
3063       if (!$1.merge_into_out_qualifier(& @1, state, $$)) {
3064          YYERROR;
3065       }
3066       if (!state->out_qualifier->push_to_global(& @1, state)) {
3067          YYERROR;
3068       }
3069    }
3070    ;