ast_to_hir.cpp revision bc04d244f5a86fd7085e3d648949413e2d2ec797
1/* 2 * Copyright © 2010 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 */ 23 24/** 25 * \file ast_to_hir.c 26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR). 27 * 28 * During the conversion to HIR, the majority of the symantic checking is 29 * preformed on the program. This includes: 30 * 31 * * Symbol table management 32 * * Type checking 33 * * Function binding 34 * 35 * The majority of this work could be done during parsing, and the parser could 36 * probably generate HIR directly. However, this results in frequent changes 37 * to the parser code. Since we do not assume that every system this complier 38 * is built on will have Flex and Bison installed, we have to store the code 39 * generated by these tools in our version control system. In other parts of 40 * the system we've seen problems where a parser was changed but the generated 41 * code was not committed, merge conflicts where created because two developers 42 * had slightly different versions of Bison installed, etc. 43 * 44 * I have also noticed that running Bison generated parsers in GDB is very 45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very 46 * well 'print $1' in GDB. 47 * 48 * As a result, my preference is to put as little C code as possible in the 49 * parser (and lexer) sources. 50 */ 51 52#include "main/core.h" /* for struct gl_extensions */ 53#include "glsl_symbol_table.h" 54#include "glsl_parser_extras.h" 55#include "ast.h" 56#include "glsl_types.h" 57#include "ir.h" 58 59void 60_mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state) 61{ 62 _mesa_glsl_initialize_variables(instructions, state); 63 _mesa_glsl_initialize_functions(state); 64 65 state->symbols->language_version = state->language_version; 66 67 state->current_function = NULL; 68 69 /* Section 4.2 of the GLSL 1.20 specification states: 70 * "The built-in functions are scoped in a scope outside the global scope 71 * users declare global variables in. That is, a shader's global scope, 72 * available for user-defined functions and global variables, is nested 73 * inside the scope containing the built-in functions." 74 * 75 * Since built-in functions like ftransform() access built-in variables, 76 * it follows that those must be in the outer scope as well. 77 * 78 * We push scope here to create this nesting effect...but don't pop. 79 * This way, a shader's globals are still in the symbol table for use 80 * by the linker. 81 */ 82 state->symbols->push_scope(); 83 84 foreach_list_typed (ast_node, ast, link, & state->translation_unit) 85 ast->hir(instructions, state); 86} 87 88 89/** 90 * If a conversion is available, convert one operand to a different type 91 * 92 * The \c from \c ir_rvalue is converted "in place". 93 * 94 * \param to Type that the operand it to be converted to 95 * \param from Operand that is being converted 96 * \param state GLSL compiler state 97 * 98 * \return 99 * If a conversion is possible (or unnecessary), \c true is returned. 100 * Otherwise \c false is returned. 101 */ 102bool 103apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from, 104 struct _mesa_glsl_parse_state *state) 105{ 106 void *ctx = state; 107 if (to->base_type == from->type->base_type) 108 return true; 109 110 /* This conversion was added in GLSL 1.20. If the compilation mode is 111 * GLSL 1.10, the conversion is skipped. 112 */ 113 if (state->language_version < 120) 114 return false; 115 116 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec: 117 * 118 * "There are no implicit array or structure conversions. For 119 * example, an array of int cannot be implicitly converted to an 120 * array of float. There are no implicit conversions between 121 * signed and unsigned integers." 122 */ 123 /* FINISHME: The above comment is partially a lie. There is int/uint 124 * FINISHME: conversion for immediate constants. 125 */ 126 if (!to->is_float() || !from->type->is_numeric()) 127 return false; 128 129 /* Convert to a floating point type with the same number of components 130 * as the original type - i.e. int to float, not int to vec4. 131 */ 132 to = glsl_type::get_instance(GLSL_TYPE_FLOAT, from->type->vector_elements, 133 from->type->matrix_columns); 134 135 switch (from->type->base_type) { 136 case GLSL_TYPE_INT: 137 from = new(ctx) ir_expression(ir_unop_i2f, to, from, NULL); 138 break; 139 case GLSL_TYPE_UINT: 140 from = new(ctx) ir_expression(ir_unop_u2f, to, from, NULL); 141 break; 142 case GLSL_TYPE_BOOL: 143 from = new(ctx) ir_expression(ir_unop_b2f, to, from, NULL); 144 break; 145 default: 146 assert(0); 147 } 148 149 return true; 150} 151 152 153static const struct glsl_type * 154arithmetic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b, 155 bool multiply, 156 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 157{ 158 const glsl_type *type_a = value_a->type; 159 const glsl_type *type_b = value_b->type; 160 161 /* From GLSL 1.50 spec, page 56: 162 * 163 * "The arithmetic binary operators add (+), subtract (-), 164 * multiply (*), and divide (/) operate on integer and 165 * floating-point scalars, vectors, and matrices." 166 */ 167 if (!type_a->is_numeric() || !type_b->is_numeric()) { 168 _mesa_glsl_error(loc, state, 169 "Operands to arithmetic operators must be numeric"); 170 return glsl_type::error_type; 171 } 172 173 174 /* "If one operand is floating-point based and the other is 175 * not, then the conversions from Section 4.1.10 "Implicit 176 * Conversions" are applied to the non-floating-point-based operand." 177 */ 178 if (!apply_implicit_conversion(type_a, value_b, state) 179 && !apply_implicit_conversion(type_b, value_a, state)) { 180 _mesa_glsl_error(loc, state, 181 "Could not implicitly convert operands to " 182 "arithmetic operator"); 183 return glsl_type::error_type; 184 } 185 type_a = value_a->type; 186 type_b = value_b->type; 187 188 /* "If the operands are integer types, they must both be signed or 189 * both be unsigned." 190 * 191 * From this rule and the preceeding conversion it can be inferred that 192 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT. 193 * The is_numeric check above already filtered out the case where either 194 * type is not one of these, so now the base types need only be tested for 195 * equality. 196 */ 197 if (type_a->base_type != type_b->base_type) { 198 _mesa_glsl_error(loc, state, 199 "base type mismatch for arithmetic operator"); 200 return glsl_type::error_type; 201 } 202 203 /* "All arithmetic binary operators result in the same fundamental type 204 * (signed integer, unsigned integer, or floating-point) as the 205 * operands they operate on, after operand type conversion. After 206 * conversion, the following cases are valid 207 * 208 * * The two operands are scalars. In this case the operation is 209 * applied, resulting in a scalar." 210 */ 211 if (type_a->is_scalar() && type_b->is_scalar()) 212 return type_a; 213 214 /* "* One operand is a scalar, and the other is a vector or matrix. 215 * In this case, the scalar operation is applied independently to each 216 * component of the vector or matrix, resulting in the same size 217 * vector or matrix." 218 */ 219 if (type_a->is_scalar()) { 220 if (!type_b->is_scalar()) 221 return type_b; 222 } else if (type_b->is_scalar()) { 223 return type_a; 224 } 225 226 /* All of the combinations of <scalar, scalar>, <vector, scalar>, 227 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been 228 * handled. 229 */ 230 assert(!type_a->is_scalar()); 231 assert(!type_b->is_scalar()); 232 233 /* "* The two operands are vectors of the same size. In this case, the 234 * operation is done component-wise resulting in the same size 235 * vector." 236 */ 237 if (type_a->is_vector() && type_b->is_vector()) { 238 if (type_a == type_b) { 239 return type_a; 240 } else { 241 _mesa_glsl_error(loc, state, 242 "vector size mismatch for arithmetic operator"); 243 return glsl_type::error_type; 244 } 245 } 246 247 /* All of the combinations of <scalar, scalar>, <vector, scalar>, 248 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and 249 * <vector, vector> have been handled. At least one of the operands must 250 * be matrix. Further, since there are no integer matrix types, the base 251 * type of both operands must be float. 252 */ 253 assert(type_a->is_matrix() || type_b->is_matrix()); 254 assert(type_a->base_type == GLSL_TYPE_FLOAT); 255 assert(type_b->base_type == GLSL_TYPE_FLOAT); 256 257 /* "* The operator is add (+), subtract (-), or divide (/), and the 258 * operands are matrices with the same number of rows and the same 259 * number of columns. In this case, the operation is done component- 260 * wise resulting in the same size matrix." 261 * * The operator is multiply (*), where both operands are matrices or 262 * one operand is a vector and the other a matrix. A right vector 263 * operand is treated as a column vector and a left vector operand as a 264 * row vector. In all these cases, it is required that the number of 265 * columns of the left operand is equal to the number of rows of the 266 * right operand. Then, the multiply (*) operation does a linear 267 * algebraic multiply, yielding an object that has the same number of 268 * rows as the left operand and the same number of columns as the right 269 * operand. Section 5.10 "Vector and Matrix Operations" explains in 270 * more detail how vectors and matrices are operated on." 271 */ 272 if (! multiply) { 273 if (type_a == type_b) 274 return type_a; 275 } else { 276 if (type_a->is_matrix() && type_b->is_matrix()) { 277 /* Matrix multiply. The columns of A must match the rows of B. Given 278 * the other previously tested constraints, this means the vector type 279 * of a row from A must be the same as the vector type of a column from 280 * B. 281 */ 282 if (type_a->row_type() == type_b->column_type()) { 283 /* The resulting matrix has the number of columns of matrix B and 284 * the number of rows of matrix A. We get the row count of A by 285 * looking at the size of a vector that makes up a column. The 286 * transpose (size of a row) is done for B. 287 */ 288 const glsl_type *const type = 289 glsl_type::get_instance(type_a->base_type, 290 type_a->column_type()->vector_elements, 291 type_b->row_type()->vector_elements); 292 assert(type != glsl_type::error_type); 293 294 return type; 295 } 296 } else if (type_a->is_matrix()) { 297 /* A is a matrix and B is a column vector. Columns of A must match 298 * rows of B. Given the other previously tested constraints, this 299 * means the vector type of a row from A must be the same as the 300 * vector the type of B. 301 */ 302 if (type_a->row_type() == type_b) { 303 /* The resulting vector has a number of elements equal to 304 * the number of rows of matrix A. */ 305 const glsl_type *const type = 306 glsl_type::get_instance(type_a->base_type, 307 type_a->column_type()->vector_elements, 308 1); 309 assert(type != glsl_type::error_type); 310 311 return type; 312 } 313 } else { 314 assert(type_b->is_matrix()); 315 316 /* A is a row vector and B is a matrix. Columns of A must match rows 317 * of B. Given the other previously tested constraints, this means 318 * the type of A must be the same as the vector type of a column from 319 * B. 320 */ 321 if (type_a == type_b->column_type()) { 322 /* The resulting vector has a number of elements equal to 323 * the number of columns of matrix B. */ 324 const glsl_type *const type = 325 glsl_type::get_instance(type_a->base_type, 326 type_b->row_type()->vector_elements, 327 1); 328 assert(type != glsl_type::error_type); 329 330 return type; 331 } 332 } 333 334 _mesa_glsl_error(loc, state, "size mismatch for matrix multiplication"); 335 return glsl_type::error_type; 336 } 337 338 339 /* "All other cases are illegal." 340 */ 341 _mesa_glsl_error(loc, state, "type mismatch"); 342 return glsl_type::error_type; 343} 344 345 346static const struct glsl_type * 347unary_arithmetic_result_type(const struct glsl_type *type, 348 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 349{ 350 /* From GLSL 1.50 spec, page 57: 351 * 352 * "The arithmetic unary operators negate (-), post- and pre-increment 353 * and decrement (-- and ++) operate on integer or floating-point 354 * values (including vectors and matrices). All unary operators work 355 * component-wise on their operands. These result with the same type 356 * they operated on." 357 */ 358 if (!type->is_numeric()) { 359 _mesa_glsl_error(loc, state, 360 "Operands to arithmetic operators must be numeric"); 361 return glsl_type::error_type; 362 } 363 364 return type; 365} 366 367/** 368 * \brief Return the result type of a bit-logic operation. 369 * 370 * If the given types to the bit-logic operator are invalid, return 371 * glsl_type::error_type. 372 * 373 * \param type_a Type of LHS of bit-logic op 374 * \param type_b Type of RHS of bit-logic op 375 */ 376static const struct glsl_type * 377bit_logic_result_type(const struct glsl_type *type_a, 378 const struct glsl_type *type_b, 379 ast_operators op, 380 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 381{ 382 if (state->language_version < 130) { 383 _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30"); 384 return glsl_type::error_type; 385 } 386 387 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec: 388 * 389 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or 390 * (|). The operands must be of type signed or unsigned integers or 391 * integer vectors." 392 */ 393 if (!type_a->is_integer()) { 394 _mesa_glsl_error(loc, state, "LHS of `%s' must be an integer", 395 ast_expression::operator_string(op)); 396 return glsl_type::error_type; 397 } 398 if (!type_b->is_integer()) { 399 _mesa_glsl_error(loc, state, "RHS of `%s' must be an integer", 400 ast_expression::operator_string(op)); 401 return glsl_type::error_type; 402 } 403 404 /* "The fundamental types of the operands (signed or unsigned) must 405 * match," 406 */ 407 if (type_a->base_type != type_b->base_type) { 408 _mesa_glsl_error(loc, state, "operands of `%s' must have the same " 409 "base type", ast_expression::operator_string(op)); 410 return glsl_type::error_type; 411 } 412 413 /* "The operands cannot be vectors of differing size." */ 414 if (type_a->is_vector() && 415 type_b->is_vector() && 416 type_a->vector_elements != type_b->vector_elements) { 417 _mesa_glsl_error(loc, state, "operands of `%s' cannot be vectors of " 418 "different sizes", ast_expression::operator_string(op)); 419 return glsl_type::error_type; 420 } 421 422 /* "If one operand is a scalar and the other a vector, the scalar is 423 * applied component-wise to the vector, resulting in the same type as 424 * the vector. The fundamental types of the operands [...] will be the 425 * resulting fundamental type." 426 */ 427 if (type_a->is_scalar()) 428 return type_b; 429 else 430 return type_a; 431} 432 433static const struct glsl_type * 434modulus_result_type(const struct glsl_type *type_a, 435 const struct glsl_type *type_b, 436 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 437{ 438 /* From GLSL 1.50 spec, page 56: 439 * "The operator modulus (%) operates on signed or unsigned integers or 440 * integer vectors. The operand types must both be signed or both be 441 * unsigned." 442 */ 443 if (!type_a->is_integer() || !type_b->is_integer() 444 || (type_a->base_type != type_b->base_type)) { 445 _mesa_glsl_error(loc, state, "type mismatch"); 446 return glsl_type::error_type; 447 } 448 449 /* "The operands cannot be vectors of differing size. If one operand is 450 * a scalar and the other vector, then the scalar is applied component- 451 * wise to the vector, resulting in the same type as the vector. If both 452 * are vectors of the same size, the result is computed component-wise." 453 */ 454 if (type_a->is_vector()) { 455 if (!type_b->is_vector() 456 || (type_a->vector_elements == type_b->vector_elements)) 457 return type_a; 458 } else 459 return type_b; 460 461 /* "The operator modulus (%) is not defined for any other data types 462 * (non-integer types)." 463 */ 464 _mesa_glsl_error(loc, state, "type mismatch"); 465 return glsl_type::error_type; 466} 467 468 469static const struct glsl_type * 470relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b, 471 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 472{ 473 const glsl_type *type_a = value_a->type; 474 const glsl_type *type_b = value_b->type; 475 476 /* From GLSL 1.50 spec, page 56: 477 * "The relational operators greater than (>), less than (<), greater 478 * than or equal (>=), and less than or equal (<=) operate only on 479 * scalar integer and scalar floating-point expressions." 480 */ 481 if (!type_a->is_numeric() 482 || !type_b->is_numeric() 483 || !type_a->is_scalar() 484 || !type_b->is_scalar()) { 485 _mesa_glsl_error(loc, state, 486 "Operands to relational operators must be scalar and " 487 "numeric"); 488 return glsl_type::error_type; 489 } 490 491 /* "Either the operands' types must match, or the conversions from 492 * Section 4.1.10 "Implicit Conversions" will be applied to the integer 493 * operand, after which the types must match." 494 */ 495 if (!apply_implicit_conversion(type_a, value_b, state) 496 && !apply_implicit_conversion(type_b, value_a, state)) { 497 _mesa_glsl_error(loc, state, 498 "Could not implicitly convert operands to " 499 "relational operator"); 500 return glsl_type::error_type; 501 } 502 type_a = value_a->type; 503 type_b = value_b->type; 504 505 if (type_a->base_type != type_b->base_type) { 506 _mesa_glsl_error(loc, state, "base type mismatch"); 507 return glsl_type::error_type; 508 } 509 510 /* "The result is scalar Boolean." 511 */ 512 return glsl_type::bool_type; 513} 514 515/** 516 * \brief Return the result type of a bit-shift operation. 517 * 518 * If the given types to the bit-shift operator are invalid, return 519 * glsl_type::error_type. 520 * 521 * \param type_a Type of LHS of bit-shift op 522 * \param type_b Type of RHS of bit-shift op 523 */ 524static const struct glsl_type * 525shift_result_type(const struct glsl_type *type_a, 526 const struct glsl_type *type_b, 527 ast_operators op, 528 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 529{ 530 if (state->language_version < 130) { 531 _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30"); 532 return glsl_type::error_type; 533 } 534 535 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec: 536 * 537 * "The shift operators (<<) and (>>). For both operators, the operands 538 * must be signed or unsigned integers or integer vectors. One operand 539 * can be signed while the other is unsigned." 540 */ 541 if (!type_a->is_integer()) { 542 _mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or " 543 "integer vector", ast_expression::operator_string(op)); 544 return glsl_type::error_type; 545 546 } 547 if (!type_b->is_integer()) { 548 _mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or " 549 "integer vector", ast_expression::operator_string(op)); 550 return glsl_type::error_type; 551 } 552 553 /* "If the first operand is a scalar, the second operand has to be 554 * a scalar as well." 555 */ 556 if (type_a->is_scalar() && !type_b->is_scalar()) { 557 _mesa_glsl_error(loc, state, "If the first operand of %s is scalar, the " 558 "second must be scalar as well", 559 ast_expression::operator_string(op)); 560 return glsl_type::error_type; 561 } 562 563 /* If both operands are vectors, check that they have same number of 564 * elements. 565 */ 566 if (type_a->is_vector() && 567 type_b->is_vector() && 568 type_a->vector_elements != type_b->vector_elements) { 569 _mesa_glsl_error(loc, state, "Vector operands to operator %s must " 570 "have same number of elements", 571 ast_expression::operator_string(op)); 572 return glsl_type::error_type; 573 } 574 575 /* "In all cases, the resulting type will be the same type as the left 576 * operand." 577 */ 578 return type_a; 579} 580 581/** 582 * Validates that a value can be assigned to a location with a specified type 583 * 584 * Validates that \c rhs can be assigned to some location. If the types are 585 * not an exact match but an automatic conversion is possible, \c rhs will be 586 * converted. 587 * 588 * \return 589 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type. 590 * Otherwise the actual RHS to be assigned will be returned. This may be 591 * \c rhs, or it may be \c rhs after some type conversion. 592 * 593 * \note 594 * In addition to being used for assignments, this function is used to 595 * type-check return values. 596 */ 597ir_rvalue * 598validate_assignment(struct _mesa_glsl_parse_state *state, 599 const glsl_type *lhs_type, ir_rvalue *rhs) 600{ 601 /* If there is already some error in the RHS, just return it. Anything 602 * else will lead to an avalanche of error message back to the user. 603 */ 604 if (rhs->type->is_error()) 605 return rhs; 606 607 /* If the types are identical, the assignment can trivially proceed. 608 */ 609 if (rhs->type == lhs_type) 610 return rhs; 611 612 /* If the array element types are the same and the size of the LHS is zero, 613 * the assignment is okay. 614 * 615 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this 616 * is handled by ir_dereference::is_lvalue. 617 */ 618 if (lhs_type->is_array() && rhs->type->is_array() 619 && (lhs_type->element_type() == rhs->type->element_type()) 620 && (lhs_type->array_size() == 0)) { 621 return rhs; 622 } 623 624 /* Check for implicit conversion in GLSL 1.20 */ 625 if (apply_implicit_conversion(lhs_type, rhs, state)) { 626 if (rhs->type == lhs_type) 627 return rhs; 628 } 629 630 return NULL; 631} 632 633ir_rvalue * 634do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state, 635 ir_rvalue *lhs, ir_rvalue *rhs, 636 YYLTYPE lhs_loc) 637{ 638 void *ctx = state; 639 bool error_emitted = (lhs->type->is_error() || rhs->type->is_error()); 640 641 if (!error_emitted) { 642 if (lhs->variable_referenced() != NULL 643 && lhs->variable_referenced()->read_only) { 644 _mesa_glsl_error(&lhs_loc, state, 645 "assignment to read-only variable '%s'", 646 lhs->variable_referenced()->name); 647 error_emitted = true; 648 649 } else if (!lhs->is_lvalue()) { 650 _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment"); 651 error_emitted = true; 652 } 653 654 if (state->es_shader && lhs->type->is_array()) { 655 _mesa_glsl_error(&lhs_loc, state, "whole array assignment is not " 656 "allowed in GLSL ES 1.00."); 657 error_emitted = true; 658 } 659 } 660 661 ir_rvalue *new_rhs = validate_assignment(state, lhs->type, rhs); 662 if (new_rhs == NULL) { 663 _mesa_glsl_error(& lhs_loc, state, "type mismatch"); 664 } else { 665 rhs = new_rhs; 666 667 /* If the LHS array was not declared with a size, it takes it size from 668 * the RHS. If the LHS is an l-value and a whole array, it must be a 669 * dereference of a variable. Any other case would require that the LHS 670 * is either not an l-value or not a whole array. 671 */ 672 if (lhs->type->array_size() == 0) { 673 ir_dereference *const d = lhs->as_dereference(); 674 675 assert(d != NULL); 676 677 ir_variable *const var = d->variable_referenced(); 678 679 assert(var != NULL); 680 681 if (var->max_array_access >= unsigned(rhs->type->array_size())) { 682 /* FINISHME: This should actually log the location of the RHS. */ 683 _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to " 684 "previous access", 685 var->max_array_access); 686 } 687 688 var->type = glsl_type::get_array_instance(lhs->type->element_type(), 689 rhs->type->array_size()); 690 d->type = var->type; 691 } 692 } 693 694 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec, 695 * but not post_inc) need the converted assigned value as an rvalue 696 * to handle things like: 697 * 698 * i = j += 1; 699 * 700 * So we always just store the computed value being assigned to a 701 * temporary and return a deref of that temporary. If the rvalue 702 * ends up not being used, the temp will get copy-propagated out. 703 */ 704 ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp", 705 ir_var_temporary); 706 ir_dereference_variable *deref_var = new(ctx) ir_dereference_variable(var); 707 instructions->push_tail(var); 708 instructions->push_tail(new(ctx) ir_assignment(deref_var, 709 rhs, 710 NULL)); 711 deref_var = new(ctx) ir_dereference_variable(var); 712 713 if (!error_emitted) 714 instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var, NULL)); 715 716 return new(ctx) ir_dereference_variable(var); 717} 718 719static ir_rvalue * 720get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue) 721{ 722 void *ctx = talloc_parent(lvalue); 723 ir_variable *var; 724 725 var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp", 726 ir_var_temporary); 727 instructions->push_tail(var); 728 var->mode = ir_var_auto; 729 730 instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var), 731 lvalue, NULL)); 732 733 /* Once we've created this temporary, mark it read only so it's no 734 * longer considered an lvalue. 735 */ 736 var->read_only = true; 737 738 return new(ctx) ir_dereference_variable(var); 739} 740 741 742ir_rvalue * 743ast_node::hir(exec_list *instructions, 744 struct _mesa_glsl_parse_state *state) 745{ 746 (void) instructions; 747 (void) state; 748 749 return NULL; 750} 751 752static void 753mark_whole_array_access(ir_rvalue *access) 754{ 755 ir_dereference_variable *deref = access->as_dereference_variable(); 756 757 if (deref) { 758 deref->var->max_array_access = deref->type->length - 1; 759 } 760} 761 762static ir_rvalue * 763do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1) 764{ 765 int join_op; 766 ir_rvalue *cmp = NULL; 767 768 if (operation == ir_binop_all_equal) 769 join_op = ir_binop_logic_and; 770 else 771 join_op = ir_binop_logic_or; 772 773 switch (op0->type->base_type) { 774 case GLSL_TYPE_FLOAT: 775 case GLSL_TYPE_UINT: 776 case GLSL_TYPE_INT: 777 case GLSL_TYPE_BOOL: 778 return new(mem_ctx) ir_expression(operation, op0, op1); 779 780 case GLSL_TYPE_ARRAY: { 781 for (unsigned int i = 0; i < op0->type->length; i++) { 782 ir_rvalue *e0, *e1, *result; 783 784 e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL), 785 new(mem_ctx) ir_constant(i)); 786 e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL), 787 new(mem_ctx) ir_constant(i)); 788 result = do_comparison(mem_ctx, operation, e0, e1); 789 790 if (cmp) { 791 cmp = new(mem_ctx) ir_expression(join_op, cmp, result); 792 } else { 793 cmp = result; 794 } 795 } 796 797 mark_whole_array_access(op0); 798 mark_whole_array_access(op1); 799 break; 800 } 801 802 case GLSL_TYPE_STRUCT: { 803 for (unsigned int i = 0; i < op0->type->length; i++) { 804 ir_rvalue *e0, *e1, *result; 805 const char *field_name = op0->type->fields.structure[i].name; 806 807 e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL), 808 field_name); 809 e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL), 810 field_name); 811 result = do_comparison(mem_ctx, operation, e0, e1); 812 813 if (cmp) { 814 cmp = new(mem_ctx) ir_expression(join_op, cmp, result); 815 } else { 816 cmp = result; 817 } 818 } 819 break; 820 } 821 822 case GLSL_TYPE_ERROR: 823 case GLSL_TYPE_VOID: 824 case GLSL_TYPE_SAMPLER: 825 /* I assume a comparison of a struct containing a sampler just 826 * ignores the sampler present in the type. 827 */ 828 break; 829 830 default: 831 assert(!"Should not get here."); 832 break; 833 } 834 835 if (cmp == NULL) 836 cmp = new(mem_ctx) ir_constant(true); 837 838 return cmp; 839} 840 841ir_rvalue * 842ast_expression::hir(exec_list *instructions, 843 struct _mesa_glsl_parse_state *state) 844{ 845 void *ctx = state; 846 static const int operations[AST_NUM_OPERATORS] = { 847 -1, /* ast_assign doesn't convert to ir_expression. */ 848 -1, /* ast_plus doesn't convert to ir_expression. */ 849 ir_unop_neg, 850 ir_binop_add, 851 ir_binop_sub, 852 ir_binop_mul, 853 ir_binop_div, 854 ir_binop_mod, 855 ir_binop_lshift, 856 ir_binop_rshift, 857 ir_binop_less, 858 ir_binop_greater, 859 ir_binop_lequal, 860 ir_binop_gequal, 861 ir_binop_all_equal, 862 ir_binop_any_nequal, 863 ir_binop_bit_and, 864 ir_binop_bit_xor, 865 ir_binop_bit_or, 866 ir_unop_bit_not, 867 ir_binop_logic_and, 868 ir_binop_logic_xor, 869 ir_binop_logic_or, 870 ir_unop_logic_not, 871 872 /* Note: The following block of expression types actually convert 873 * to multiple IR instructions. 874 */ 875 ir_binop_mul, /* ast_mul_assign */ 876 ir_binop_div, /* ast_div_assign */ 877 ir_binop_mod, /* ast_mod_assign */ 878 ir_binop_add, /* ast_add_assign */ 879 ir_binop_sub, /* ast_sub_assign */ 880 ir_binop_lshift, /* ast_ls_assign */ 881 ir_binop_rshift, /* ast_rs_assign */ 882 ir_binop_bit_and, /* ast_and_assign */ 883 ir_binop_bit_xor, /* ast_xor_assign */ 884 ir_binop_bit_or, /* ast_or_assign */ 885 886 -1, /* ast_conditional doesn't convert to ir_expression. */ 887 ir_binop_add, /* ast_pre_inc. */ 888 ir_binop_sub, /* ast_pre_dec. */ 889 ir_binop_add, /* ast_post_inc. */ 890 ir_binop_sub, /* ast_post_dec. */ 891 -1, /* ast_field_selection doesn't conv to ir_expression. */ 892 -1, /* ast_array_index doesn't convert to ir_expression. */ 893 -1, /* ast_function_call doesn't conv to ir_expression. */ 894 -1, /* ast_identifier doesn't convert to ir_expression. */ 895 -1, /* ast_int_constant doesn't convert to ir_expression. */ 896 -1, /* ast_uint_constant doesn't conv to ir_expression. */ 897 -1, /* ast_float_constant doesn't conv to ir_expression. */ 898 -1, /* ast_bool_constant doesn't conv to ir_expression. */ 899 -1, /* ast_sequence doesn't convert to ir_expression. */ 900 }; 901 ir_rvalue *result = NULL; 902 ir_rvalue *op[3]; 903 const struct glsl_type *type = glsl_type::error_type; 904 bool error_emitted = false; 905 YYLTYPE loc; 906 907 loc = this->get_location(); 908 909 switch (this->oper) { 910 case ast_assign: { 911 op[0] = this->subexpressions[0]->hir(instructions, state); 912 op[1] = this->subexpressions[1]->hir(instructions, state); 913 914 result = do_assignment(instructions, state, op[0], op[1], 915 this->subexpressions[0]->get_location()); 916 error_emitted = result->type->is_error(); 917 type = result->type; 918 break; 919 } 920 921 case ast_plus: 922 op[0] = this->subexpressions[0]->hir(instructions, state); 923 924 type = unary_arithmetic_result_type(op[0]->type, state, & loc); 925 926 error_emitted = type->is_error(); 927 928 result = op[0]; 929 break; 930 931 case ast_neg: 932 op[0] = this->subexpressions[0]->hir(instructions, state); 933 934 type = unary_arithmetic_result_type(op[0]->type, state, & loc); 935 936 error_emitted = type->is_error(); 937 938 result = new(ctx) ir_expression(operations[this->oper], type, 939 op[0], NULL); 940 break; 941 942 case ast_add: 943 case ast_sub: 944 case ast_mul: 945 case ast_div: 946 op[0] = this->subexpressions[0]->hir(instructions, state); 947 op[1] = this->subexpressions[1]->hir(instructions, state); 948 949 type = arithmetic_result_type(op[0], op[1], 950 (this->oper == ast_mul), 951 state, & loc); 952 error_emitted = type->is_error(); 953 954 result = new(ctx) ir_expression(operations[this->oper], type, 955 op[0], op[1]); 956 break; 957 958 case ast_mod: 959 op[0] = this->subexpressions[0]->hir(instructions, state); 960 op[1] = this->subexpressions[1]->hir(instructions, state); 961 962 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc); 963 964 assert(operations[this->oper] == ir_binop_mod); 965 966 result = new(ctx) ir_expression(operations[this->oper], type, 967 op[0], op[1]); 968 error_emitted = type->is_error(); 969 break; 970 971 case ast_lshift: 972 case ast_rshift: 973 if (state->language_version < 130) { 974 _mesa_glsl_error(&loc, state, "operator %s requires GLSL 1.30", 975 operator_string(this->oper)); 976 error_emitted = true; 977 } 978 979 op[0] = this->subexpressions[0]->hir(instructions, state); 980 op[1] = this->subexpressions[1]->hir(instructions, state); 981 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state, 982 &loc); 983 result = new(ctx) ir_expression(operations[this->oper], type, 984 op[0], op[1]); 985 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 986 break; 987 988 case ast_less: 989 case ast_greater: 990 case ast_lequal: 991 case ast_gequal: 992 op[0] = this->subexpressions[0]->hir(instructions, state); 993 op[1] = this->subexpressions[1]->hir(instructions, state); 994 995 type = relational_result_type(op[0], op[1], state, & loc); 996 997 /* The relational operators must either generate an error or result 998 * in a scalar boolean. See page 57 of the GLSL 1.50 spec. 999 */ 1000 assert(type->is_error() 1001 || ((type->base_type == GLSL_TYPE_BOOL) 1002 && type->is_scalar())); 1003 1004 result = new(ctx) ir_expression(operations[this->oper], type, 1005 op[0], op[1]); 1006 error_emitted = type->is_error(); 1007 break; 1008 1009 case ast_nequal: 1010 case ast_equal: 1011 op[0] = this->subexpressions[0]->hir(instructions, state); 1012 op[1] = this->subexpressions[1]->hir(instructions, state); 1013 1014 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec: 1015 * 1016 * "The equality operators equal (==), and not equal (!=) 1017 * operate on all types. They result in a scalar Boolean. If 1018 * the operand types do not match, then there must be a 1019 * conversion from Section 4.1.10 "Implicit Conversions" 1020 * applied to one operand that can make them match, in which 1021 * case this conversion is done." 1022 */ 1023 if ((!apply_implicit_conversion(op[0]->type, op[1], state) 1024 && !apply_implicit_conversion(op[1]->type, op[0], state)) 1025 || (op[0]->type != op[1]->type)) { 1026 _mesa_glsl_error(& loc, state, "operands of `%s' must have the same " 1027 "type", (this->oper == ast_equal) ? "==" : "!="); 1028 error_emitted = true; 1029 } else if ((state->language_version <= 110) 1030 && (op[0]->type->is_array() || op[1]->type->is_array())) { 1031 _mesa_glsl_error(& loc, state, "array comparisons forbidden in " 1032 "GLSL 1.10"); 1033 error_emitted = true; 1034 } 1035 1036 result = do_comparison(ctx, operations[this->oper], op[0], op[1]); 1037 type = glsl_type::bool_type; 1038 1039 assert(error_emitted || (result->type == glsl_type::bool_type)); 1040 break; 1041 1042 case ast_bit_and: 1043 case ast_bit_xor: 1044 case ast_bit_or: 1045 op[0] = this->subexpressions[0]->hir(instructions, state); 1046 op[1] = this->subexpressions[1]->hir(instructions, state); 1047 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper, 1048 state, &loc); 1049 result = new(ctx) ir_expression(operations[this->oper], type, 1050 op[0], op[1]); 1051 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1052 break; 1053 1054 case ast_bit_not: 1055 op[0] = this->subexpressions[0]->hir(instructions, state); 1056 1057 if (state->language_version < 130) { 1058 _mesa_glsl_error(&loc, state, "bit-wise operations require GLSL 1.30"); 1059 error_emitted = true; 1060 } 1061 1062 if (!op[0]->type->is_integer()) { 1063 _mesa_glsl_error(&loc, state, "operand of `~' must be an integer"); 1064 error_emitted = true; 1065 } 1066 1067 type = op[0]->type; 1068 result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL); 1069 break; 1070 1071 case ast_logic_and: { 1072 op[0] = this->subexpressions[0]->hir(instructions, state); 1073 1074 if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) { 1075 YYLTYPE loc = this->subexpressions[0]->get_location(); 1076 1077 _mesa_glsl_error(& loc, state, "LHS of `%s' must be scalar boolean", 1078 operator_string(this->oper)); 1079 error_emitted = true; 1080 } 1081 1082 ir_constant *op0_const = op[0]->constant_expression_value(); 1083 if (op0_const) { 1084 if (op0_const->value.b[0]) { 1085 op[1] = this->subexpressions[1]->hir(instructions, state); 1086 1087 if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) { 1088 YYLTYPE loc = this->subexpressions[1]->get_location(); 1089 1090 _mesa_glsl_error(& loc, state, 1091 "RHS of `%s' must be scalar boolean", 1092 operator_string(this->oper)); 1093 error_emitted = true; 1094 } 1095 result = op[1]; 1096 } else { 1097 result = op0_const; 1098 } 1099 type = glsl_type::bool_type; 1100 } else { 1101 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type, 1102 "and_tmp", 1103 ir_var_temporary); 1104 instructions->push_tail(tmp); 1105 1106 ir_if *const stmt = new(ctx) ir_if(op[0]); 1107 instructions->push_tail(stmt); 1108 1109 op[1] = this->subexpressions[1]->hir(&stmt->then_instructions, state); 1110 1111 if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) { 1112 YYLTYPE loc = this->subexpressions[1]->get_location(); 1113 1114 _mesa_glsl_error(& loc, state, 1115 "RHS of `%s' must be scalar boolean", 1116 operator_string(this->oper)); 1117 error_emitted = true; 1118 } 1119 1120 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp); 1121 ir_assignment *const then_assign = 1122 new(ctx) ir_assignment(then_deref, op[1], NULL); 1123 stmt->then_instructions.push_tail(then_assign); 1124 1125 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp); 1126 ir_assignment *const else_assign = 1127 new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false), NULL); 1128 stmt->else_instructions.push_tail(else_assign); 1129 1130 result = new(ctx) ir_dereference_variable(tmp); 1131 type = tmp->type; 1132 } 1133 break; 1134 } 1135 1136 case ast_logic_or: { 1137 op[0] = this->subexpressions[0]->hir(instructions, state); 1138 1139 if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) { 1140 YYLTYPE loc = this->subexpressions[0]->get_location(); 1141 1142 _mesa_glsl_error(& loc, state, "LHS of `%s' must be scalar boolean", 1143 operator_string(this->oper)); 1144 error_emitted = true; 1145 } 1146 1147 ir_constant *op0_const = op[0]->constant_expression_value(); 1148 if (op0_const) { 1149 if (op0_const->value.b[0]) { 1150 result = op0_const; 1151 } else { 1152 op[1] = this->subexpressions[1]->hir(instructions, state); 1153 1154 if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) { 1155 YYLTYPE loc = this->subexpressions[1]->get_location(); 1156 1157 _mesa_glsl_error(& loc, state, 1158 "RHS of `%s' must be scalar boolean", 1159 operator_string(this->oper)); 1160 error_emitted = true; 1161 } 1162 result = op[1]; 1163 } 1164 type = glsl_type::bool_type; 1165 } else { 1166 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type, 1167 "or_tmp", 1168 ir_var_temporary); 1169 instructions->push_tail(tmp); 1170 1171 ir_if *const stmt = new(ctx) ir_if(op[0]); 1172 instructions->push_tail(stmt); 1173 1174 op[1] = this->subexpressions[1]->hir(&stmt->else_instructions, state); 1175 1176 if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) { 1177 YYLTYPE loc = this->subexpressions[1]->get_location(); 1178 1179 _mesa_glsl_error(& loc, state, "RHS of `%s' must be scalar boolean", 1180 operator_string(this->oper)); 1181 error_emitted = true; 1182 } 1183 1184 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp); 1185 ir_assignment *const then_assign = 1186 new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true), NULL); 1187 stmt->then_instructions.push_tail(then_assign); 1188 1189 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp); 1190 ir_assignment *const else_assign = 1191 new(ctx) ir_assignment(else_deref, op[1], NULL); 1192 stmt->else_instructions.push_tail(else_assign); 1193 1194 result = new(ctx) ir_dereference_variable(tmp); 1195 type = tmp->type; 1196 } 1197 break; 1198 } 1199 1200 case ast_logic_xor: 1201 op[0] = this->subexpressions[0]->hir(instructions, state); 1202 op[1] = this->subexpressions[1]->hir(instructions, state); 1203 1204 1205 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type, 1206 op[0], op[1]); 1207 type = glsl_type::bool_type; 1208 break; 1209 1210 case ast_logic_not: 1211 op[0] = this->subexpressions[0]->hir(instructions, state); 1212 1213 if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) { 1214 YYLTYPE loc = this->subexpressions[0]->get_location(); 1215 1216 _mesa_glsl_error(& loc, state, 1217 "operand of `!' must be scalar boolean"); 1218 error_emitted = true; 1219 } 1220 1221 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type, 1222 op[0], NULL); 1223 type = glsl_type::bool_type; 1224 break; 1225 1226 case ast_mul_assign: 1227 case ast_div_assign: 1228 case ast_add_assign: 1229 case ast_sub_assign: { 1230 op[0] = this->subexpressions[0]->hir(instructions, state); 1231 op[1] = this->subexpressions[1]->hir(instructions, state); 1232 1233 type = arithmetic_result_type(op[0], op[1], 1234 (this->oper == ast_mul_assign), 1235 state, & loc); 1236 1237 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1238 op[0], op[1]); 1239 1240 result = do_assignment(instructions, state, 1241 op[0]->clone(ctx, NULL), temp_rhs, 1242 this->subexpressions[0]->get_location()); 1243 type = result->type; 1244 error_emitted = (op[0]->type->is_error()); 1245 1246 /* GLSL 1.10 does not allow array assignment. However, we don't have to 1247 * explicitly test for this because none of the binary expression 1248 * operators allow array operands either. 1249 */ 1250 1251 break; 1252 } 1253 1254 case ast_mod_assign: { 1255 op[0] = this->subexpressions[0]->hir(instructions, state); 1256 op[1] = this->subexpressions[1]->hir(instructions, state); 1257 1258 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc); 1259 1260 assert(operations[this->oper] == ir_binop_mod); 1261 1262 ir_rvalue *temp_rhs; 1263 temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1264 op[0], op[1]); 1265 1266 result = do_assignment(instructions, state, 1267 op[0]->clone(ctx, NULL), temp_rhs, 1268 this->subexpressions[0]->get_location()); 1269 type = result->type; 1270 error_emitted = type->is_error(); 1271 break; 1272 } 1273 1274 case ast_ls_assign: 1275 case ast_rs_assign: { 1276 op[0] = this->subexpressions[0]->hir(instructions, state); 1277 op[1] = this->subexpressions[1]->hir(instructions, state); 1278 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state, 1279 &loc); 1280 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], 1281 type, op[0], op[1]); 1282 result = do_assignment(instructions, state, op[0]->clone(ctx, NULL), 1283 temp_rhs, 1284 this->subexpressions[0]->get_location()); 1285 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1286 break; 1287 } 1288 1289 case ast_and_assign: 1290 case ast_xor_assign: 1291 case ast_or_assign: { 1292 op[0] = this->subexpressions[0]->hir(instructions, state); 1293 op[1] = this->subexpressions[1]->hir(instructions, state); 1294 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper, 1295 state, &loc); 1296 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], 1297 type, op[0], op[1]); 1298 result = do_assignment(instructions, state, op[0]->clone(ctx, NULL), 1299 temp_rhs, 1300 this->subexpressions[0]->get_location()); 1301 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1302 break; 1303 } 1304 1305 case ast_conditional: { 1306 op[0] = this->subexpressions[0]->hir(instructions, state); 1307 1308 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec: 1309 * 1310 * "The ternary selection operator (?:). It operates on three 1311 * expressions (exp1 ? exp2 : exp3). This operator evaluates the 1312 * first expression, which must result in a scalar Boolean." 1313 */ 1314 if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) { 1315 YYLTYPE loc = this->subexpressions[0]->get_location(); 1316 1317 _mesa_glsl_error(& loc, state, "?: condition must be scalar boolean"); 1318 error_emitted = true; 1319 } 1320 1321 /* The :? operator is implemented by generating an anonymous temporary 1322 * followed by an if-statement. The last instruction in each branch of 1323 * the if-statement assigns a value to the anonymous temporary. This 1324 * temporary is the r-value of the expression. 1325 */ 1326 exec_list then_instructions; 1327 exec_list else_instructions; 1328 1329 op[1] = this->subexpressions[1]->hir(&then_instructions, state); 1330 op[2] = this->subexpressions[2]->hir(&else_instructions, state); 1331 1332 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec: 1333 * 1334 * "The second and third expressions can be any type, as 1335 * long their types match, or there is a conversion in 1336 * Section 4.1.10 "Implicit Conversions" that can be applied 1337 * to one of the expressions to make their types match. This 1338 * resulting matching type is the type of the entire 1339 * expression." 1340 */ 1341 if ((!apply_implicit_conversion(op[1]->type, op[2], state) 1342 && !apply_implicit_conversion(op[2]->type, op[1], state)) 1343 || (op[1]->type != op[2]->type)) { 1344 YYLTYPE loc = this->subexpressions[1]->get_location(); 1345 1346 _mesa_glsl_error(& loc, state, "Second and third operands of ?: " 1347 "operator must have matching types."); 1348 error_emitted = true; 1349 type = glsl_type::error_type; 1350 } else { 1351 type = op[1]->type; 1352 } 1353 1354 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec: 1355 * 1356 * "The second and third expressions must be the same type, but can 1357 * be of any type other than an array." 1358 */ 1359 if ((state->language_version <= 110) && type->is_array()) { 1360 _mesa_glsl_error(& loc, state, "Second and third operands of ?: " 1361 "operator must not be arrays."); 1362 error_emitted = true; 1363 } 1364 1365 ir_constant *cond_val = op[0]->constant_expression_value(); 1366 ir_constant *then_val = op[1]->constant_expression_value(); 1367 ir_constant *else_val = op[2]->constant_expression_value(); 1368 1369 if (then_instructions.is_empty() 1370 && else_instructions.is_empty() 1371 && (cond_val != NULL) && (then_val != NULL) && (else_val != NULL)) { 1372 result = (cond_val->value.b[0]) ? then_val : else_val; 1373 } else { 1374 ir_variable *const tmp = 1375 new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary); 1376 instructions->push_tail(tmp); 1377 1378 ir_if *const stmt = new(ctx) ir_if(op[0]); 1379 instructions->push_tail(stmt); 1380 1381 then_instructions.move_nodes_to(& stmt->then_instructions); 1382 ir_dereference *const then_deref = 1383 new(ctx) ir_dereference_variable(tmp); 1384 ir_assignment *const then_assign = 1385 new(ctx) ir_assignment(then_deref, op[1], NULL); 1386 stmt->then_instructions.push_tail(then_assign); 1387 1388 else_instructions.move_nodes_to(& stmt->else_instructions); 1389 ir_dereference *const else_deref = 1390 new(ctx) ir_dereference_variable(tmp); 1391 ir_assignment *const else_assign = 1392 new(ctx) ir_assignment(else_deref, op[2], NULL); 1393 stmt->else_instructions.push_tail(else_assign); 1394 1395 result = new(ctx) ir_dereference_variable(tmp); 1396 } 1397 break; 1398 } 1399 1400 case ast_pre_inc: 1401 case ast_pre_dec: { 1402 op[0] = this->subexpressions[0]->hir(instructions, state); 1403 if (op[0]->type->base_type == GLSL_TYPE_FLOAT) 1404 op[1] = new(ctx) ir_constant(1.0f); 1405 else 1406 op[1] = new(ctx) ir_constant(1); 1407 1408 type = arithmetic_result_type(op[0], op[1], false, state, & loc); 1409 1410 ir_rvalue *temp_rhs; 1411 temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1412 op[0], op[1]); 1413 1414 result = do_assignment(instructions, state, 1415 op[0]->clone(ctx, NULL), temp_rhs, 1416 this->subexpressions[0]->get_location()); 1417 type = result->type; 1418 error_emitted = op[0]->type->is_error(); 1419 break; 1420 } 1421 1422 case ast_post_inc: 1423 case ast_post_dec: { 1424 op[0] = this->subexpressions[0]->hir(instructions, state); 1425 if (op[0]->type->base_type == GLSL_TYPE_FLOAT) 1426 op[1] = new(ctx) ir_constant(1.0f); 1427 else 1428 op[1] = new(ctx) ir_constant(1); 1429 1430 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1431 1432 type = arithmetic_result_type(op[0], op[1], false, state, & loc); 1433 1434 ir_rvalue *temp_rhs; 1435 temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1436 op[0], op[1]); 1437 1438 /* Get a temporary of a copy of the lvalue before it's modified. 1439 * This may get thrown away later. 1440 */ 1441 result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL)); 1442 1443 (void)do_assignment(instructions, state, 1444 op[0]->clone(ctx, NULL), temp_rhs, 1445 this->subexpressions[0]->get_location()); 1446 1447 type = result->type; 1448 error_emitted = op[0]->type->is_error(); 1449 break; 1450 } 1451 1452 case ast_field_selection: 1453 result = _mesa_ast_field_selection_to_hir(this, instructions, state); 1454 type = result->type; 1455 break; 1456 1457 case ast_array_index: { 1458 YYLTYPE index_loc = subexpressions[1]->get_location(); 1459 1460 op[0] = subexpressions[0]->hir(instructions, state); 1461 op[1] = subexpressions[1]->hir(instructions, state); 1462 1463 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1464 1465 ir_rvalue *const array = op[0]; 1466 1467 result = new(ctx) ir_dereference_array(op[0], op[1]); 1468 1469 /* Do not use op[0] after this point. Use array. 1470 */ 1471 op[0] = NULL; 1472 1473 1474 if (error_emitted) 1475 break; 1476 1477 if (!array->type->is_array() 1478 && !array->type->is_matrix() 1479 && !array->type->is_vector()) { 1480 _mesa_glsl_error(& index_loc, state, 1481 "cannot dereference non-array / non-matrix / " 1482 "non-vector"); 1483 error_emitted = true; 1484 } 1485 1486 if (!op[1]->type->is_integer()) { 1487 _mesa_glsl_error(& index_loc, state, 1488 "array index must be integer type"); 1489 error_emitted = true; 1490 } else if (!op[1]->type->is_scalar()) { 1491 _mesa_glsl_error(& index_loc, state, 1492 "array index must be scalar"); 1493 error_emitted = true; 1494 } 1495 1496 /* If the array index is a constant expression and the array has a 1497 * declared size, ensure that the access is in-bounds. If the array 1498 * index is not a constant expression, ensure that the array has a 1499 * declared size. 1500 */ 1501 ir_constant *const const_index = op[1]->constant_expression_value(); 1502 if (const_index != NULL) { 1503 const int idx = const_index->value.i[0]; 1504 const char *type_name; 1505 unsigned bound = 0; 1506 1507 if (array->type->is_matrix()) { 1508 type_name = "matrix"; 1509 } else if (array->type->is_vector()) { 1510 type_name = "vector"; 1511 } else { 1512 type_name = "array"; 1513 } 1514 1515 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec: 1516 * 1517 * "It is illegal to declare an array with a size, and then 1518 * later (in the same shader) index the same array with an 1519 * integral constant expression greater than or equal to the 1520 * declared size. It is also illegal to index an array with a 1521 * negative constant expression." 1522 */ 1523 if (array->type->is_matrix()) { 1524 if (array->type->row_type()->vector_elements <= idx) { 1525 bound = array->type->row_type()->vector_elements; 1526 } 1527 } else if (array->type->is_vector()) { 1528 if (array->type->vector_elements <= idx) { 1529 bound = array->type->vector_elements; 1530 } 1531 } else { 1532 if ((array->type->array_size() > 0) 1533 && (array->type->array_size() <= idx)) { 1534 bound = array->type->array_size(); 1535 } 1536 } 1537 1538 if (bound > 0) { 1539 _mesa_glsl_error(& loc, state, "%s index must be < %u", 1540 type_name, bound); 1541 error_emitted = true; 1542 } else if (idx < 0) { 1543 _mesa_glsl_error(& loc, state, "%s index must be >= 0", 1544 type_name); 1545 error_emitted = true; 1546 } 1547 1548 if (array->type->is_array()) { 1549 /* If the array is a variable dereference, it dereferences the 1550 * whole array, by definition. Use this to get the variable. 1551 * 1552 * FINISHME: Should some methods for getting / setting / testing 1553 * FINISHME: array access limits be added to ir_dereference? 1554 */ 1555 ir_variable *const v = array->whole_variable_referenced(); 1556 if ((v != NULL) && (unsigned(idx) > v->max_array_access)) 1557 v->max_array_access = idx; 1558 } 1559 } else if (array->type->array_size() == 0) { 1560 _mesa_glsl_error(&loc, state, "unsized array index must be constant"); 1561 } else { 1562 if (array->type->is_array()) { 1563 /* whole_variable_referenced can return NULL if the array is a 1564 * member of a structure. In this case it is safe to not update 1565 * the max_array_access field because it is never used for fields 1566 * of structures. 1567 */ 1568 ir_variable *v = array->whole_variable_referenced(); 1569 if (v != NULL) 1570 v->max_array_access = array->type->array_size(); 1571 } 1572 } 1573 1574 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec: 1575 * 1576 * "Samplers aggregated into arrays within a shader (using square 1577 * brackets [ ]) can only be indexed with integral constant 1578 * expressions [...]." 1579 * 1580 * This restriction was added in GLSL 1.30. Shaders using earlier version 1581 * of the language should not be rejected by the compiler front-end for 1582 * using this construct. This allows useful things such as using a loop 1583 * counter as the index to an array of samplers. If the loop in unrolled, 1584 * the code should compile correctly. Instead, emit a warning. 1585 */ 1586 if (array->type->is_array() && 1587 array->type->element_type()->is_sampler() && 1588 const_index == NULL) { 1589 1590 if (state->language_version == 100) { 1591 _mesa_glsl_warning(&loc, state, 1592 "sampler arrays indexed with non-constant " 1593 "expressions is optional in GLSL ES 1.00"); 1594 } else if (state->language_version < 130) { 1595 _mesa_glsl_warning(&loc, state, 1596 "sampler arrays indexed with non-constant " 1597 "expressions is forbidden in GLSL 1.30 and " 1598 "later"); 1599 } else { 1600 _mesa_glsl_error(&loc, state, 1601 "sampler arrays indexed with non-constant " 1602 "expressions is forbidden in GLSL 1.30 and " 1603 "later"); 1604 error_emitted = true; 1605 } 1606 } 1607 1608 if (error_emitted) 1609 result->type = glsl_type::error_type; 1610 1611 type = result->type; 1612 break; 1613 } 1614 1615 case ast_function_call: 1616 /* Should *NEVER* get here. ast_function_call should always be handled 1617 * by ast_function_expression::hir. 1618 */ 1619 assert(0); 1620 break; 1621 1622 case ast_identifier: { 1623 /* ast_identifier can appear several places in a full abstract syntax 1624 * tree. This particular use must be at location specified in the grammar 1625 * as 'variable_identifier'. 1626 */ 1627 ir_variable *var = 1628 state->symbols->get_variable(this->primary_expression.identifier); 1629 1630 result = new(ctx) ir_dereference_variable(var); 1631 1632 if (var != NULL) { 1633 var->used = true; 1634 type = result->type; 1635 } else { 1636 _mesa_glsl_error(& loc, state, "`%s' undeclared", 1637 this->primary_expression.identifier); 1638 1639 error_emitted = true; 1640 } 1641 break; 1642 } 1643 1644 case ast_int_constant: 1645 type = glsl_type::int_type; 1646 result = new(ctx) ir_constant(this->primary_expression.int_constant); 1647 break; 1648 1649 case ast_uint_constant: 1650 type = glsl_type::uint_type; 1651 result = new(ctx) ir_constant(this->primary_expression.uint_constant); 1652 break; 1653 1654 case ast_float_constant: 1655 type = glsl_type::float_type; 1656 result = new(ctx) ir_constant(this->primary_expression.float_constant); 1657 break; 1658 1659 case ast_bool_constant: 1660 type = glsl_type::bool_type; 1661 result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant)); 1662 break; 1663 1664 case ast_sequence: { 1665 /* It should not be possible to generate a sequence in the AST without 1666 * any expressions in it. 1667 */ 1668 assert(!this->expressions.is_empty()); 1669 1670 /* The r-value of a sequence is the last expression in the sequence. If 1671 * the other expressions in the sequence do not have side-effects (and 1672 * therefore add instructions to the instruction list), they get dropped 1673 * on the floor. 1674 */ 1675 foreach_list_typed (ast_node, ast, link, &this->expressions) 1676 result = ast->hir(instructions, state); 1677 1678 type = result->type; 1679 1680 /* Any errors should have already been emitted in the loop above. 1681 */ 1682 error_emitted = true; 1683 break; 1684 } 1685 } 1686 1687 if (type->is_error() && !error_emitted) 1688 _mesa_glsl_error(& loc, state, "type mismatch"); 1689 1690 return result; 1691} 1692 1693 1694ir_rvalue * 1695ast_expression_statement::hir(exec_list *instructions, 1696 struct _mesa_glsl_parse_state *state) 1697{ 1698 /* It is possible to have expression statements that don't have an 1699 * expression. This is the solitary semicolon: 1700 * 1701 * for (i = 0; i < 5; i++) 1702 * ; 1703 * 1704 * In this case the expression will be NULL. Test for NULL and don't do 1705 * anything in that case. 1706 */ 1707 if (expression != NULL) 1708 expression->hir(instructions, state); 1709 1710 /* Statements do not have r-values. 1711 */ 1712 return NULL; 1713} 1714 1715 1716ir_rvalue * 1717ast_compound_statement::hir(exec_list *instructions, 1718 struct _mesa_glsl_parse_state *state) 1719{ 1720 if (new_scope) 1721 state->symbols->push_scope(); 1722 1723 foreach_list_typed (ast_node, ast, link, &this->statements) 1724 ast->hir(instructions, state); 1725 1726 if (new_scope) 1727 state->symbols->pop_scope(); 1728 1729 /* Compound statements do not have r-values. 1730 */ 1731 return NULL; 1732} 1733 1734 1735static const glsl_type * 1736process_array_type(YYLTYPE *loc, const glsl_type *base, ast_node *array_size, 1737 struct _mesa_glsl_parse_state *state) 1738{ 1739 unsigned length = 0; 1740 1741 /* FINISHME: Reject delcarations of multidimensional arrays. */ 1742 1743 if (array_size != NULL) { 1744 exec_list dummy_instructions; 1745 ir_rvalue *const ir = array_size->hir(& dummy_instructions, state); 1746 YYLTYPE loc = array_size->get_location(); 1747 1748 /* FINISHME: Verify that the grammar forbids side-effects in array 1749 * FINISHME: sizes. i.e., 'vec4 [x = 12] data' 1750 */ 1751 assert(dummy_instructions.is_empty()); 1752 1753 if (ir != NULL) { 1754 if (!ir->type->is_integer()) { 1755 _mesa_glsl_error(& loc, state, "array size must be integer type"); 1756 } else if (!ir->type->is_scalar()) { 1757 _mesa_glsl_error(& loc, state, "array size must be scalar type"); 1758 } else { 1759 ir_constant *const size = ir->constant_expression_value(); 1760 1761 if (size == NULL) { 1762 _mesa_glsl_error(& loc, state, "array size must be a " 1763 "constant valued expression"); 1764 } else if (size->value.i[0] <= 0) { 1765 _mesa_glsl_error(& loc, state, "array size must be > 0"); 1766 } else { 1767 assert(size->type == ir->type); 1768 length = size->value.u[0]; 1769 } 1770 } 1771 } 1772 } else if (state->es_shader) { 1773 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized 1774 * array declarations have been removed from the language. 1775 */ 1776 _mesa_glsl_error(loc, state, "unsized array declarations are not " 1777 "allowed in GLSL ES 1.00."); 1778 } 1779 1780 return glsl_type::get_array_instance(base, length); 1781} 1782 1783 1784const glsl_type * 1785ast_type_specifier::glsl_type(const char **name, 1786 struct _mesa_glsl_parse_state *state) const 1787{ 1788 const struct glsl_type *type; 1789 1790 type = state->symbols->get_type(this->type_name); 1791 *name = this->type_name; 1792 1793 if (this->is_array) { 1794 YYLTYPE loc = this->get_location(); 1795 type = process_array_type(&loc, type, this->array_size, state); 1796 } 1797 1798 return type; 1799} 1800 1801 1802static void 1803apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual, 1804 ir_variable *var, 1805 struct _mesa_glsl_parse_state *state, 1806 YYLTYPE *loc) 1807{ 1808 if (qual->flags.q.invariant) { 1809 if (var->used) { 1810 _mesa_glsl_error(loc, state, 1811 "variable `%s' may not be redeclared " 1812 "`invariant' after being used", 1813 var->name); 1814 } else { 1815 var->invariant = 1; 1816 } 1817 } 1818 1819 if (qual->flags.q.constant || qual->flags.q.attribute 1820 || qual->flags.q.uniform 1821 || (qual->flags.q.varying && (state->target == fragment_shader))) 1822 var->read_only = 1; 1823 1824 if (qual->flags.q.centroid) 1825 var->centroid = 1; 1826 1827 if (qual->flags.q.attribute && state->target != vertex_shader) { 1828 var->type = glsl_type::error_type; 1829 _mesa_glsl_error(loc, state, 1830 "`attribute' variables may not be declared in the " 1831 "%s shader", 1832 _mesa_glsl_shader_target_name(state->target)); 1833 } 1834 1835 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec: 1836 * 1837 * "The varying qualifier can be used only with the data types 1838 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of 1839 * these." 1840 */ 1841 if (qual->flags.q.varying) { 1842 const glsl_type *non_array_type; 1843 1844 if (var->type && var->type->is_array()) 1845 non_array_type = var->type->fields.array; 1846 else 1847 non_array_type = var->type; 1848 1849 if (non_array_type && non_array_type->base_type != GLSL_TYPE_FLOAT) { 1850 var->type = glsl_type::error_type; 1851 _mesa_glsl_error(loc, state, 1852 "varying variables must be of base type float"); 1853 } 1854 } 1855 1856 /* If there is no qualifier that changes the mode of the variable, leave 1857 * the setting alone. 1858 */ 1859 if (qual->flags.q.in && qual->flags.q.out) 1860 var->mode = ir_var_inout; 1861 else if (qual->flags.q.attribute || qual->flags.q.in 1862 || (qual->flags.q.varying && (state->target == fragment_shader))) 1863 var->mode = ir_var_in; 1864 else if (qual->flags.q.out 1865 || (qual->flags.q.varying && (state->target == vertex_shader))) 1866 var->mode = ir_var_out; 1867 else if (qual->flags.q.uniform) 1868 var->mode = ir_var_uniform; 1869 1870 if (state->all_invariant && (state->current_function == NULL)) { 1871 switch (state->target) { 1872 case vertex_shader: 1873 if (var->mode == ir_var_out) 1874 var->invariant = true; 1875 break; 1876 case geometry_shader: 1877 if ((var->mode == ir_var_in) || (var->mode == ir_var_out)) 1878 var->invariant = true; 1879 break; 1880 case fragment_shader: 1881 if (var->mode == ir_var_in) 1882 var->invariant = true; 1883 break; 1884 } 1885 } 1886 1887 if (qual->flags.q.flat) 1888 var->interpolation = ir_var_flat; 1889 else if (qual->flags.q.noperspective) 1890 var->interpolation = ir_var_noperspective; 1891 else 1892 var->interpolation = ir_var_smooth; 1893 1894 var->pixel_center_integer = qual->flags.q.pixel_center_integer; 1895 var->origin_upper_left = qual->flags.q.origin_upper_left; 1896 if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer) 1897 && (strcmp(var->name, "gl_FragCoord") != 0)) { 1898 const char *const qual_string = (qual->flags.q.origin_upper_left) 1899 ? "origin_upper_left" : "pixel_center_integer"; 1900 1901 _mesa_glsl_error(loc, state, 1902 "layout qualifier `%s' can only be applied to " 1903 "fragment shader input `gl_FragCoord'", 1904 qual_string); 1905 } 1906 1907 if (qual->flags.q.explicit_location) { 1908 const bool global_scope = (state->current_function == NULL); 1909 bool fail = false; 1910 const char *string = ""; 1911 1912 /* In the vertex shader only shader inputs can be given explicit 1913 * locations. 1914 * 1915 * In the fragment shader only shader outputs can be given explicit 1916 * locations. 1917 */ 1918 switch (state->target) { 1919 case vertex_shader: 1920 if (!global_scope || (var->mode != ir_var_in)) { 1921 fail = true; 1922 string = "input"; 1923 } 1924 break; 1925 1926 case geometry_shader: 1927 _mesa_glsl_error(loc, state, 1928 "geometry shader variables cannot be given " 1929 "explicit locations\n"); 1930 break; 1931 1932 case fragment_shader: 1933 if (!global_scope || (var->mode != ir_var_in)) { 1934 fail = true; 1935 string = "output"; 1936 } 1937 break; 1938 }; 1939 1940 if (fail) { 1941 _mesa_glsl_error(loc, state, 1942 "only %s shader %s variables can be given an " 1943 "explicit location\n", 1944 _mesa_glsl_shader_target_name(state->target), 1945 string); 1946 } else { 1947 var->explicit_location = true; 1948 1949 /* This bit of silliness is needed because invalid explicit locations 1950 * are supposed to be flagged during linking. Small negative values 1951 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias 1952 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS). 1953 * The linker needs to be able to differentiate these cases. This 1954 * ensures that negative values stay negative. 1955 */ 1956 if (qual->location >= 0) { 1957 var->location = (state->target == vertex_shader) 1958 ? (qual->location + VERT_ATTRIB_GENERIC0) 1959 : (qual->location + FRAG_RESULT_DATA0); 1960 } else { 1961 var->location = qual->location; 1962 } 1963 } 1964 } 1965 1966 /* Does the declaration use the 'layout' keyword? 1967 */ 1968 const bool uses_layout = qual->flags.q.pixel_center_integer 1969 || qual->flags.q.origin_upper_left 1970 || qual->flags.q.explicit_location; 1971 1972 /* Does the declaration use the deprecated 'attribute' or 'varying' 1973 * keywords? 1974 */ 1975 const bool uses_deprecated_qualifier = qual->flags.q.attribute 1976 || qual->flags.q.varying; 1977 1978 /* Is the 'layout' keyword used with parameters that allow relaxed checking. 1979 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some 1980 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable 1981 * allowed the layout qualifier to be used with 'varying' and 'attribute'. 1982 * These extensions and all following extensions that add the 'layout' 1983 * keyword have been modified to require the use of 'in' or 'out'. 1984 * 1985 * The following extension do not allow the deprecated keywords: 1986 * 1987 * GL_AMD_conservative_depth 1988 * GL_ARB_gpu_shader5 1989 * GL_ARB_separate_shader_objects 1990 * GL_ARB_tesselation_shader 1991 * GL_ARB_transform_feedback3 1992 * GL_ARB_uniform_buffer_object 1993 * 1994 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5 1995 * allow layout with the deprecated keywords. 1996 */ 1997 const bool relaxed_layout_qualifier_checking = 1998 state->ARB_fragment_coord_conventions_enable; 1999 2000 if (uses_layout && uses_deprecated_qualifier) { 2001 if (relaxed_layout_qualifier_checking) { 2002 _mesa_glsl_warning(loc, state, 2003 "`layout' qualifier may not be used with " 2004 "`attribute' or `varying'"); 2005 } else { 2006 _mesa_glsl_error(loc, state, 2007 "`layout' qualifier may not be used with " 2008 "`attribute' or `varying'"); 2009 } 2010 } 2011 2012 /* Layout qualifiers for gl_FragDepth, which are enabled by extension 2013 * AMD_conservative_depth. 2014 */ 2015 int depth_layout_count = qual->flags.q.depth_any 2016 + qual->flags.q.depth_greater 2017 + qual->flags.q.depth_less 2018 + qual->flags.q.depth_unchanged; 2019 if (depth_layout_count > 0 2020 && !state->AMD_conservative_depth_enable) { 2021 _mesa_glsl_error(loc, state, 2022 "extension GL_AMD_conservative_depth must be enabled " 2023 "to use depth layout qualifiers"); 2024 } else if (depth_layout_count > 0 2025 && strcmp(var->name, "gl_FragDepth") != 0) { 2026 _mesa_glsl_error(loc, state, 2027 "depth layout qualifiers can be applied only to " 2028 "gl_FragDepth"); 2029 } else if (depth_layout_count > 1 2030 && strcmp(var->name, "gl_FragDepth") == 0) { 2031 _mesa_glsl_error(loc, state, 2032 "at most one depth layout qualifier can be applied to " 2033 "gl_FragDepth"); 2034 } 2035 if (qual->flags.q.depth_any) 2036 var->depth_layout = ir_depth_layout_any; 2037 else if (qual->flags.q.depth_greater) 2038 var->depth_layout = ir_depth_layout_greater; 2039 else if (qual->flags.q.depth_less) 2040 var->depth_layout = ir_depth_layout_less; 2041 else if (qual->flags.q.depth_unchanged) 2042 var->depth_layout = ir_depth_layout_unchanged; 2043 else 2044 var->depth_layout = ir_depth_layout_none; 2045 2046 if (var->type->is_array() && state->language_version != 110) { 2047 var->array_lvalue = true; 2048 } 2049} 2050 2051 2052ir_rvalue * 2053ast_declarator_list::hir(exec_list *instructions, 2054 struct _mesa_glsl_parse_state *state) 2055{ 2056 void *ctx = state; 2057 const struct glsl_type *decl_type; 2058 const char *type_name = NULL; 2059 ir_rvalue *result = NULL; 2060 YYLTYPE loc = this->get_location(); 2061 2062 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec: 2063 * 2064 * "To ensure that a particular output variable is invariant, it is 2065 * necessary to use the invariant qualifier. It can either be used to 2066 * qualify a previously declared variable as being invariant 2067 * 2068 * invariant gl_Position; // make existing gl_Position be invariant" 2069 * 2070 * In these cases the parser will set the 'invariant' flag in the declarator 2071 * list, and the type will be NULL. 2072 */ 2073 if (this->invariant) { 2074 assert(this->type == NULL); 2075 2076 if (state->current_function != NULL) { 2077 _mesa_glsl_error(& loc, state, 2078 "All uses of `invariant' keyword must be at global " 2079 "scope\n"); 2080 } 2081 2082 foreach_list_typed (ast_declaration, decl, link, &this->declarations) { 2083 assert(!decl->is_array); 2084 assert(decl->array_size == NULL); 2085 assert(decl->initializer == NULL); 2086 2087 ir_variable *const earlier = 2088 state->symbols->get_variable(decl->identifier); 2089 if (earlier == NULL) { 2090 _mesa_glsl_error(& loc, state, 2091 "Undeclared variable `%s' cannot be marked " 2092 "invariant\n", decl->identifier); 2093 } else if ((state->target == vertex_shader) 2094 && (earlier->mode != ir_var_out)) { 2095 _mesa_glsl_error(& loc, state, 2096 "`%s' cannot be marked invariant, vertex shader " 2097 "outputs only\n", decl->identifier); 2098 } else if ((state->target == fragment_shader) 2099 && (earlier->mode != ir_var_in)) { 2100 _mesa_glsl_error(& loc, state, 2101 "`%s' cannot be marked invariant, fragment shader " 2102 "inputs only\n", decl->identifier); 2103 } else if (earlier->used) { 2104 _mesa_glsl_error(& loc, state, 2105 "variable `%s' may not be redeclared " 2106 "`invariant' after being used", 2107 earlier->name); 2108 } else { 2109 earlier->invariant = true; 2110 } 2111 } 2112 2113 /* Invariant redeclarations do not have r-values. 2114 */ 2115 return NULL; 2116 } 2117 2118 assert(this->type != NULL); 2119 assert(!this->invariant); 2120 2121 /* The type specifier may contain a structure definition. Process that 2122 * before any of the variable declarations. 2123 */ 2124 (void) this->type->specifier->hir(instructions, state); 2125 2126 decl_type = this->type->specifier->glsl_type(& type_name, state); 2127 if (this->declarations.is_empty()) { 2128 /* The only valid case where the declaration list can be empty is when 2129 * the declaration is setting the default precision of a built-in type 2130 * (e.g., 'precision highp vec4;'). 2131 */ 2132 2133 if (decl_type != NULL) { 2134 } else { 2135 _mesa_glsl_error(& loc, state, "incomplete declaration"); 2136 } 2137 } 2138 2139 foreach_list_typed (ast_declaration, decl, link, &this->declarations) { 2140 const struct glsl_type *var_type; 2141 ir_variable *var; 2142 2143 /* FINISHME: Emit a warning if a variable declaration shadows a 2144 * FINISHME: declaration at a higher scope. 2145 */ 2146 2147 if ((decl_type == NULL) || decl_type->is_void()) { 2148 if (type_name != NULL) { 2149 _mesa_glsl_error(& loc, state, 2150 "invalid type `%s' in declaration of `%s'", 2151 type_name, decl->identifier); 2152 } else { 2153 _mesa_glsl_error(& loc, state, 2154 "invalid type in declaration of `%s'", 2155 decl->identifier); 2156 } 2157 continue; 2158 } 2159 2160 if (decl->is_array) { 2161 var_type = process_array_type(&loc, decl_type, decl->array_size, 2162 state); 2163 } else { 2164 var_type = decl_type; 2165 } 2166 2167 var = new(ctx) ir_variable(var_type, decl->identifier, ir_var_auto); 2168 2169 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification; 2170 * 2171 * "Global variables can only use the qualifiers const, 2172 * attribute, uni form, or varying. Only one may be 2173 * specified. 2174 * 2175 * Local variables can only use the qualifier const." 2176 * 2177 * This is relaxed in GLSL 1.30. It is also relaxed by any extension 2178 * that adds the 'layout' keyword. 2179 */ 2180 if ((state->language_version < 130) 2181 && !state->ARB_explicit_attrib_location_enable 2182 && !state->ARB_fragment_coord_conventions_enable) { 2183 if (this->type->qualifier.flags.q.out) { 2184 _mesa_glsl_error(& loc, state, 2185 "`out' qualifier in declaration of `%s' " 2186 "only valid for function parameters in %s.", 2187 decl->identifier, state->version_string); 2188 } 2189 if (this->type->qualifier.flags.q.in) { 2190 _mesa_glsl_error(& loc, state, 2191 "`in' qualifier in declaration of `%s' " 2192 "only valid for function parameters in %s.", 2193 decl->identifier, state->version_string); 2194 } 2195 /* FINISHME: Test for other invalid qualifiers. */ 2196 } 2197 2198 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, 2199 & loc); 2200 2201 if (this->type->qualifier.flags.q.invariant) { 2202 if ((state->target == vertex_shader) && !(var->mode == ir_var_out || 2203 var->mode == ir_var_inout)) { 2204 /* FINISHME: Note that this doesn't work for invariant on 2205 * a function signature outval 2206 */ 2207 _mesa_glsl_error(& loc, state, 2208 "`%s' cannot be marked invariant, vertex shader " 2209 "outputs only\n", var->name); 2210 } else if ((state->target == fragment_shader) && 2211 !(var->mode == ir_var_in || var->mode == ir_var_inout)) { 2212 /* FINISHME: Note that this doesn't work for invariant on 2213 * a function signature inval 2214 */ 2215 _mesa_glsl_error(& loc, state, 2216 "`%s' cannot be marked invariant, fragment shader " 2217 "inputs only\n", var->name); 2218 } 2219 } 2220 2221 if (state->current_function != NULL) { 2222 const char *mode = NULL; 2223 const char *extra = ""; 2224 2225 /* There is no need to check for 'inout' here because the parser will 2226 * only allow that in function parameter lists. 2227 */ 2228 if (this->type->qualifier.flags.q.attribute) { 2229 mode = "attribute"; 2230 } else if (this->type->qualifier.flags.q.uniform) { 2231 mode = "uniform"; 2232 } else if (this->type->qualifier.flags.q.varying) { 2233 mode = "varying"; 2234 } else if (this->type->qualifier.flags.q.in) { 2235 mode = "in"; 2236 extra = " or in function parameter list"; 2237 } else if (this->type->qualifier.flags.q.out) { 2238 mode = "out"; 2239 extra = " or in function parameter list"; 2240 } 2241 2242 if (mode) { 2243 _mesa_glsl_error(& loc, state, 2244 "%s variable `%s' must be declared at " 2245 "global scope%s", 2246 mode, var->name, extra); 2247 } 2248 } else if (var->mode == ir_var_in) { 2249 var->read_only = true; 2250 2251 if (state->target == vertex_shader) { 2252 bool error_emitted = false; 2253 2254 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec: 2255 * 2256 * "Vertex shader inputs can only be float, floating-point 2257 * vectors, matrices, signed and unsigned integers and integer 2258 * vectors. Vertex shader inputs can also form arrays of these 2259 * types, but not structures." 2260 * 2261 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec: 2262 * 2263 * "Vertex shader inputs can only be float, floating-point 2264 * vectors, matrices, signed and unsigned integers and integer 2265 * vectors. They cannot be arrays or structures." 2266 * 2267 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec: 2268 * 2269 * "The attribute qualifier can be used only with float, 2270 * floating-point vectors, and matrices. Attribute variables 2271 * cannot be declared as arrays or structures." 2272 */ 2273 const glsl_type *check_type = var->type->is_array() 2274 ? var->type->fields.array : var->type; 2275 2276 switch (check_type->base_type) { 2277 case GLSL_TYPE_FLOAT: 2278 break; 2279 case GLSL_TYPE_UINT: 2280 case GLSL_TYPE_INT: 2281 if (state->language_version > 120) 2282 break; 2283 /* FALLTHROUGH */ 2284 default: 2285 _mesa_glsl_error(& loc, state, 2286 "vertex shader input / attribute cannot have " 2287 "type %s`%s'", 2288 var->type->is_array() ? "array of " : "", 2289 check_type->name); 2290 error_emitted = true; 2291 } 2292 2293 if (!error_emitted && (state->language_version <= 130) 2294 && var->type->is_array()) { 2295 _mesa_glsl_error(& loc, state, 2296 "vertex shader input / attribute cannot have " 2297 "array type"); 2298 error_emitted = true; 2299 } 2300 } 2301 } 2302 2303 /* Integer vertex outputs must be qualified with 'flat'. 2304 * 2305 * From section 4.3.6 of the GLSL 1.30 spec: 2306 * "If a vertex output is a signed or unsigned integer or integer 2307 * vector, then it must be qualified with the interpolation qualifier 2308 * flat." 2309 */ 2310 if (state->language_version >= 130 2311 && state->target == vertex_shader 2312 && state->current_function == NULL 2313 && var->type->is_integer() 2314 && var->mode == ir_var_out 2315 && var->interpolation != ir_var_flat) { 2316 2317 _mesa_glsl_error(&loc, state, "If a vertex output is an integer, " 2318 "then it must be qualified with 'flat'"); 2319 } 2320 2321 2322 /* Interpolation qualifiers cannot be applied to 'centroid' and 2323 * 'centroid varying'. 2324 * 2325 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec: 2326 * "interpolation qualifiers may only precede the qualifiers in, 2327 * centroid in, out, or centroid out in a declaration. They do not apply 2328 * to the deprecated storage qualifiers varying or centroid varying." 2329 */ 2330 if (state->language_version >= 130 2331 && this->type->qualifier.has_interpolation() 2332 && this->type->qualifier.flags.q.varying) { 2333 2334 const char *i = this->type->qualifier.interpolation_string(); 2335 assert(i != NULL); 2336 const char *s; 2337 if (this->type->qualifier.flags.q.centroid) 2338 s = "centroid varying"; 2339 else 2340 s = "varying"; 2341 2342 _mesa_glsl_error(&loc, state, 2343 "qualifier '%s' cannot be applied to the " 2344 "deprecated storage qualifier '%s'", i, s); 2345 } 2346 2347 2348 /* Interpolation qualifiers can only apply to vertex shader outputs and 2349 * fragment shader inputs. 2350 * 2351 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec: 2352 * "Outputs from a vertex shader (out) and inputs to a fragment 2353 * shader (in) can be further qualified with one or more of these 2354 * interpolation qualifiers" 2355 */ 2356 if (state->language_version >= 130 2357 && this->type->qualifier.has_interpolation()) { 2358 2359 const char *i = this->type->qualifier.interpolation_string(); 2360 assert(i != NULL); 2361 2362 switch (state->target) { 2363 case vertex_shader: 2364 if (this->type->qualifier.flags.q.in) { 2365 _mesa_glsl_error(&loc, state, 2366 "qualifier '%s' cannot be applied to vertex " 2367 "shader inputs", i); 2368 } 2369 break; 2370 case fragment_shader: 2371 if (this->type->qualifier.flags.q.out) { 2372 _mesa_glsl_error(&loc, state, 2373 "qualifier '%s' cannot be applied to fragment " 2374 "shader outputs", i); 2375 } 2376 break; 2377 default: 2378 assert(0); 2379 } 2380 } 2381 2382 2383 /* From section 4.3.4 of the GLSL 1.30 spec: 2384 * "It is an error to use centroid in in a vertex shader." 2385 */ 2386 if (state->language_version >= 130 2387 && this->type->qualifier.flags.q.centroid 2388 && this->type->qualifier.flags.q.in 2389 && state->target == vertex_shader) { 2390 2391 _mesa_glsl_error(&loc, state, 2392 "'centroid in' cannot be used in a vertex shader"); 2393 } 2394 2395 2396 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30. 2397 */ 2398 if (this->type->specifier->precision != ast_precision_none 2399 && state->language_version != 100 2400 && state->language_version < 130) { 2401 2402 _mesa_glsl_error(&loc, state, 2403 "precision qualifiers are supported only in GLSL ES " 2404 "1.00, and GLSL 1.30 and later"); 2405 } 2406 2407 2408 /* Precision qualifiers only apply to floating point and integer types. 2409 * 2410 * From section 4.5.2 of the GLSL 1.30 spec: 2411 * "Any floating point or any integer declaration can have the type 2412 * preceded by one of these precision qualifiers [...] Literal 2413 * constants do not have precision qualifiers. Neither do Boolean 2414 * variables. 2415 */ 2416 if (this->type->specifier->precision != ast_precision_none 2417 && !var->type->is_float() 2418 && !var->type->is_integer() 2419 && !(var->type->is_array() 2420 && (var->type->fields.array->is_float() 2421 || var->type->fields.array->is_integer()))) { 2422 2423 _mesa_glsl_error(&loc, state, 2424 "precision qualifiers apply only to floating point " 2425 "and integer types"); 2426 } 2427 2428 /* Process the initializer and add its instructions to a temporary 2429 * list. This list will be added to the instruction stream (below) after 2430 * the declaration is added. This is done because in some cases (such as 2431 * redeclarations) the declaration may not actually be added to the 2432 * instruction stream. 2433 */ 2434 exec_list initializer_instructions; 2435 if (decl->initializer != NULL) { 2436 YYLTYPE initializer_loc = decl->initializer->get_location(); 2437 2438 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec: 2439 * 2440 * "All uniform variables are read-only and are initialized either 2441 * directly by an application via API commands, or indirectly by 2442 * OpenGL." 2443 */ 2444 if ((state->language_version <= 110) 2445 && (var->mode == ir_var_uniform)) { 2446 _mesa_glsl_error(& initializer_loc, state, 2447 "cannot initialize uniforms in GLSL 1.10"); 2448 } 2449 2450 if (var->type->is_sampler()) { 2451 _mesa_glsl_error(& initializer_loc, state, 2452 "cannot initialize samplers"); 2453 } 2454 2455 if ((var->mode == ir_var_in) && (state->current_function == NULL)) { 2456 _mesa_glsl_error(& initializer_loc, state, 2457 "cannot initialize %s shader input / %s", 2458 _mesa_glsl_shader_target_name(state->target), 2459 (state->target == vertex_shader) 2460 ? "attribute" : "varying"); 2461 } 2462 2463 ir_dereference *const lhs = new(ctx) ir_dereference_variable(var); 2464 ir_rvalue *rhs = decl->initializer->hir(&initializer_instructions, 2465 state); 2466 2467 /* Calculate the constant value if this is a const or uniform 2468 * declaration. 2469 */ 2470 if (this->type->qualifier.flags.q.constant 2471 || this->type->qualifier.flags.q.uniform) { 2472 ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs); 2473 if (new_rhs != NULL) { 2474 rhs = new_rhs; 2475 2476 ir_constant *constant_value = rhs->constant_expression_value(); 2477 if (!constant_value) { 2478 _mesa_glsl_error(& initializer_loc, state, 2479 "initializer of %s variable `%s' must be a " 2480 "constant expression", 2481 (this->type->qualifier.flags.q.constant) 2482 ? "const" : "uniform", 2483 decl->identifier); 2484 if (var->type->is_numeric()) { 2485 /* Reduce cascading errors. */ 2486 var->constant_value = ir_constant::zero(ctx, var->type); 2487 } 2488 } else { 2489 rhs = constant_value; 2490 var->constant_value = constant_value; 2491 } 2492 } else { 2493 _mesa_glsl_error(&initializer_loc, state, 2494 "initializer of type %s cannot be assigned to " 2495 "variable of type %s", 2496 rhs->type->name, var->type->name); 2497 if (var->type->is_numeric()) { 2498 /* Reduce cascading errors. */ 2499 var->constant_value = ir_constant::zero(ctx, var->type); 2500 } 2501 } 2502 } 2503 2504 if (rhs && !rhs->type->is_error()) { 2505 bool temp = var->read_only; 2506 if (this->type->qualifier.flags.q.constant) 2507 var->read_only = false; 2508 2509 /* Never emit code to initialize a uniform. 2510 */ 2511 const glsl_type *initializer_type; 2512 if (!this->type->qualifier.flags.q.uniform) { 2513 result = do_assignment(&initializer_instructions, state, 2514 lhs, rhs, 2515 this->get_location()); 2516 initializer_type = result->type; 2517 } else 2518 initializer_type = rhs->type; 2519 2520 /* If the declared variable is an unsized array, it must inherrit 2521 * its full type from the initializer. A declaration such as 2522 * 2523 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0); 2524 * 2525 * becomes 2526 * 2527 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0); 2528 * 2529 * The assignment generated in the if-statement (below) will also 2530 * automatically handle this case for non-uniforms. 2531 * 2532 * If the declared variable is not an array, the types must 2533 * already match exactly. As a result, the type assignment 2534 * here can be done unconditionally. For non-uniforms the call 2535 * to do_assignment can change the type of the initializer (via 2536 * the implicit conversion rules). For uniforms the initializer 2537 * must be a constant expression, and the type of that expression 2538 * was validated above. 2539 */ 2540 var->type = initializer_type; 2541 2542 var->read_only = temp; 2543 } 2544 } 2545 2546 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec: 2547 * 2548 * "It is an error to write to a const variable outside of 2549 * its declaration, so they must be initialized when 2550 * declared." 2551 */ 2552 if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) { 2553 _mesa_glsl_error(& loc, state, 2554 "const declaration of `%s' must be initialized", 2555 decl->identifier); 2556 } 2557 2558 /* Check if this declaration is actually a re-declaration, either to 2559 * resize an array or add qualifiers to an existing variable. 2560 * 2561 * This is allowed for variables in the current scope, or when at 2562 * global scope (for built-ins in the implicit outer scope). 2563 */ 2564 ir_variable *earlier = state->symbols->get_variable(decl->identifier); 2565 if (earlier != NULL && (state->current_function == NULL || 2566 state->symbols->name_declared_this_scope(decl->identifier))) { 2567 2568 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec, 2569 * 2570 * "It is legal to declare an array without a size and then 2571 * later re-declare the same name as an array of the same 2572 * type and specify a size." 2573 */ 2574 if ((earlier->type->array_size() == 0) 2575 && var->type->is_array() 2576 && (var->type->element_type() == earlier->type->element_type())) { 2577 /* FINISHME: This doesn't match the qualifiers on the two 2578 * FINISHME: declarations. It's not 100% clear whether this is 2579 * FINISHME: required or not. 2580 */ 2581 2582 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec: 2583 * 2584 * "The size [of gl_TexCoord] can be at most 2585 * gl_MaxTextureCoords." 2586 */ 2587 const unsigned size = unsigned(var->type->array_size()); 2588 if ((strcmp("gl_TexCoord", var->name) == 0) 2589 && (size > state->Const.MaxTextureCoords)) { 2590 YYLTYPE loc = this->get_location(); 2591 2592 _mesa_glsl_error(& loc, state, "`gl_TexCoord' array size cannot " 2593 "be larger than gl_MaxTextureCoords (%u)\n", 2594 state->Const.MaxTextureCoords); 2595 } else if ((size > 0) && (size <= earlier->max_array_access)) { 2596 YYLTYPE loc = this->get_location(); 2597 2598 _mesa_glsl_error(& loc, state, "array size must be > %u due to " 2599 "previous access", 2600 earlier->max_array_access); 2601 } 2602 2603 earlier->type = var->type; 2604 delete var; 2605 var = NULL; 2606 } else if (state->ARB_fragment_coord_conventions_enable 2607 && strcmp(var->name, "gl_FragCoord") == 0 2608 && earlier->type == var->type 2609 && earlier->mode == var->mode) { 2610 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout 2611 * qualifiers. 2612 */ 2613 earlier->origin_upper_left = var->origin_upper_left; 2614 earlier->pixel_center_integer = var->pixel_center_integer; 2615 2616 /* According to section 4.3.7 of the GLSL 1.30 spec, 2617 * the following built-in varaibles can be redeclared with an 2618 * interpolation qualifier: 2619 * * gl_FrontColor 2620 * * gl_BackColor 2621 * * gl_FrontSecondaryColor 2622 * * gl_BackSecondaryColor 2623 * * gl_Color 2624 * * gl_SecondaryColor 2625 */ 2626 } else if (state->language_version >= 130 2627 && (strcmp(var->name, "gl_FrontColor") == 0 2628 || strcmp(var->name, "gl_BackColor") == 0 2629 || strcmp(var->name, "gl_FrontSecondaryColor") == 0 2630 || strcmp(var->name, "gl_BackSecondaryColor") == 0 2631 || strcmp(var->name, "gl_Color") == 0 2632 || strcmp(var->name, "gl_SecondaryColor") == 0) 2633 && earlier->type == var->type 2634 && earlier->mode == var->mode) { 2635 earlier->interpolation = var->interpolation; 2636 2637 /* Layout qualifiers for gl_FragDepth. */ 2638 } else if (state->AMD_conservative_depth_enable 2639 && strcmp(var->name, "gl_FragDepth") == 0 2640 && earlier->type == var->type 2641 && earlier->mode == var->mode) { 2642 2643 /** From the AMD_conservative_depth spec: 2644 * Within any shader, the first redeclarations of gl_FragDepth 2645 * must appear before any use of gl_FragDepth. 2646 */ 2647 if (earlier->used) { 2648 _mesa_glsl_error(&loc, state, 2649 "the first redeclaration of gl_FragDepth " 2650 "must appear before any use of gl_FragDepth"); 2651 } 2652 2653 /* Prevent inconsistent redeclaration of depth layout qualifier. */ 2654 if (earlier->depth_layout != ir_depth_layout_none 2655 && earlier->depth_layout != var->depth_layout) { 2656 _mesa_glsl_error(&loc, state, 2657 "gl_FragDepth: depth layout is declared here " 2658 "as '%s, but it was previously declared as " 2659 "'%s'", 2660 depth_layout_string(var->depth_layout), 2661 depth_layout_string(earlier->depth_layout)); 2662 } 2663 2664 earlier->depth_layout = var->depth_layout; 2665 2666 } else { 2667 YYLTYPE loc = this->get_location(); 2668 _mesa_glsl_error(&loc, state, "`%s' redeclared", decl->identifier); 2669 } 2670 2671 continue; 2672 } 2673 2674 /* By now, we know it's a new variable declaration (we didn't hit the 2675 * above "continue"). 2676 * 2677 * From page 15 (page 21 of the PDF) of the GLSL 1.10 spec, 2678 * 2679 * "Identifiers starting with "gl_" are reserved for use by 2680 * OpenGL, and may not be declared in a shader as either a 2681 * variable or a function." 2682 */ 2683 if (strncmp(decl->identifier, "gl_", 3) == 0) 2684 _mesa_glsl_error(& loc, state, 2685 "identifier `%s' uses reserved `gl_' prefix", 2686 decl->identifier); 2687 2688 /* Add the variable to the symbol table. Note that the initializer's 2689 * IR was already processed earlier (though it hasn't been emitted yet), 2690 * without the variable in scope. 2691 * 2692 * This differs from most C-like languages, but it follows the GLSL 2693 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50 2694 * spec: 2695 * 2696 * "Within a declaration, the scope of a name starts immediately 2697 * after the initializer if present or immediately after the name 2698 * being declared if not." 2699 */ 2700 if (!state->symbols->add_variable(var)) { 2701 YYLTYPE loc = this->get_location(); 2702 _mesa_glsl_error(&loc, state, "name `%s' already taken in the " 2703 "current scope", decl->identifier); 2704 continue; 2705 } 2706 2707 /* Push the variable declaration to the top. It means that all 2708 * the variable declarations will appear in a funny 2709 * last-to-first order, but otherwise we run into trouble if a 2710 * function is prototyped, a global var is decled, then the 2711 * function is defined with usage of the global var. See 2712 * glslparsertest's CorrectModule.frag. 2713 */ 2714 instructions->push_head(var); 2715 instructions->append_list(&initializer_instructions); 2716 } 2717 2718 2719 /* Generally, variable declarations do not have r-values. However, 2720 * one is used for the declaration in 2721 * 2722 * while (bool b = some_condition()) { 2723 * ... 2724 * } 2725 * 2726 * so we return the rvalue from the last seen declaration here. 2727 */ 2728 return result; 2729} 2730 2731 2732ir_rvalue * 2733ast_parameter_declarator::hir(exec_list *instructions, 2734 struct _mesa_glsl_parse_state *state) 2735{ 2736 void *ctx = state; 2737 const struct glsl_type *type; 2738 const char *name = NULL; 2739 YYLTYPE loc = this->get_location(); 2740 2741 type = this->type->specifier->glsl_type(& name, state); 2742 2743 if (type == NULL) { 2744 if (name != NULL) { 2745 _mesa_glsl_error(& loc, state, 2746 "invalid type `%s' in declaration of `%s'", 2747 name, this->identifier); 2748 } else { 2749 _mesa_glsl_error(& loc, state, 2750 "invalid type in declaration of `%s'", 2751 this->identifier); 2752 } 2753 2754 type = glsl_type::error_type; 2755 } 2756 2757 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec: 2758 * 2759 * "Functions that accept no input arguments need not use void in the 2760 * argument list because prototypes (or definitions) are required and 2761 * therefore there is no ambiguity when an empty argument list "( )" is 2762 * declared. The idiom "(void)" as a parameter list is provided for 2763 * convenience." 2764 * 2765 * Placing this check here prevents a void parameter being set up 2766 * for a function, which avoids tripping up checks for main taking 2767 * parameters and lookups of an unnamed symbol. 2768 */ 2769 if (type->is_void()) { 2770 if (this->identifier != NULL) 2771 _mesa_glsl_error(& loc, state, 2772 "named parameter cannot have type `void'"); 2773 2774 is_void = true; 2775 return NULL; 2776 } 2777 2778 if (formal_parameter && (this->identifier == NULL)) { 2779 _mesa_glsl_error(& loc, state, "formal parameter lacks a name"); 2780 return NULL; 2781 } 2782 2783 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...) 2784 * call already handled the "vec4[..] foo" case. 2785 */ 2786 if (this->is_array) { 2787 type = process_array_type(&loc, type, this->array_size, state); 2788 } 2789 2790 if (type->array_size() == 0) { 2791 _mesa_glsl_error(&loc, state, "arrays passed as parameters must have " 2792 "a declared size."); 2793 type = glsl_type::error_type; 2794 } 2795 2796 is_void = false; 2797 ir_variable *var = new(ctx) ir_variable(type, this->identifier, ir_var_in); 2798 2799 /* Apply any specified qualifiers to the parameter declaration. Note that 2800 * for function parameters the default mode is 'in'. 2801 */ 2802 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc); 2803 2804 instructions->push_tail(var); 2805 2806 /* Parameter declarations do not have r-values. 2807 */ 2808 return NULL; 2809} 2810 2811 2812void 2813ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters, 2814 bool formal, 2815 exec_list *ir_parameters, 2816 _mesa_glsl_parse_state *state) 2817{ 2818 ast_parameter_declarator *void_param = NULL; 2819 unsigned count = 0; 2820 2821 foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) { 2822 param->formal_parameter = formal; 2823 param->hir(ir_parameters, state); 2824 2825 if (param->is_void) 2826 void_param = param; 2827 2828 count++; 2829 } 2830 2831 if ((void_param != NULL) && (count > 1)) { 2832 YYLTYPE loc = void_param->get_location(); 2833 2834 _mesa_glsl_error(& loc, state, 2835 "`void' parameter must be only parameter"); 2836 } 2837} 2838 2839 2840void 2841emit_function(_mesa_glsl_parse_state *state, exec_list *instructions, 2842 ir_function *f) 2843{ 2844 /* Emit the new function header */ 2845 if (state->current_function == NULL) { 2846 instructions->push_tail(f); 2847 } else { 2848 /* IR invariants disallow function declarations or definitions nested 2849 * within other function definitions. Insert the new ir_function 2850 * block in the instruction sequence before the ir_function block 2851 * containing the current ir_function_signature. 2852 */ 2853 ir_function *const curr = 2854 const_cast<ir_function *>(state->current_function->function()); 2855 2856 curr->insert_before(f); 2857 } 2858} 2859 2860 2861ir_rvalue * 2862ast_function::hir(exec_list *instructions, 2863 struct _mesa_glsl_parse_state *state) 2864{ 2865 void *ctx = state; 2866 ir_function *f = NULL; 2867 ir_function_signature *sig = NULL; 2868 exec_list hir_parameters; 2869 2870 const char *const name = identifier; 2871 2872 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec, 2873 * 2874 * "Function declarations (prototypes) cannot occur inside of functions; 2875 * they must be at global scope, or for the built-in functions, outside 2876 * the global scope." 2877 * 2878 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec, 2879 * 2880 * "User defined functions may only be defined within the global scope." 2881 * 2882 * Note that this language does not appear in GLSL 1.10. 2883 */ 2884 if ((state->current_function != NULL) && (state->language_version != 110)) { 2885 YYLTYPE loc = this->get_location(); 2886 _mesa_glsl_error(&loc, state, 2887 "declaration of function `%s' not allowed within " 2888 "function body", name); 2889 } 2890 2891 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec, 2892 * 2893 * "Identifiers starting with "gl_" are reserved for use by 2894 * OpenGL, and may not be declared in a shader as either a 2895 * variable or a function." 2896 */ 2897 if (strncmp(name, "gl_", 3) == 0) { 2898 YYLTYPE loc = this->get_location(); 2899 _mesa_glsl_error(&loc, state, 2900 "identifier `%s' uses reserved `gl_' prefix", name); 2901 } 2902 2903 /* Convert the list of function parameters to HIR now so that they can be 2904 * used below to compare this function's signature with previously seen 2905 * signatures for functions with the same name. 2906 */ 2907 ast_parameter_declarator::parameters_to_hir(& this->parameters, 2908 is_definition, 2909 & hir_parameters, state); 2910 2911 const char *return_type_name; 2912 const glsl_type *return_type = 2913 this->return_type->specifier->glsl_type(& return_type_name, state); 2914 2915 if (!return_type) { 2916 YYLTYPE loc = this->get_location(); 2917 _mesa_glsl_error(&loc, state, 2918 "function `%s' has undeclared return type `%s'", 2919 name, return_type_name); 2920 return_type = glsl_type::error_type; 2921 } 2922 2923 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec: 2924 * "No qualifier is allowed on the return type of a function." 2925 */ 2926 if (this->return_type->has_qualifiers()) { 2927 YYLTYPE loc = this->get_location(); 2928 _mesa_glsl_error(& loc, state, 2929 "function `%s' return type has qualifiers", name); 2930 } 2931 2932 /* Verify that this function's signature either doesn't match a previously 2933 * seen signature for a function with the same name, or, if a match is found, 2934 * that the previously seen signature does not have an associated definition. 2935 */ 2936 f = state->symbols->get_function(name); 2937 if (f != NULL && (state->es_shader || f->has_user_signature())) { 2938 sig = f->exact_matching_signature(&hir_parameters); 2939 if (sig != NULL) { 2940 const char *badvar = sig->qualifiers_match(&hir_parameters); 2941 if (badvar != NULL) { 2942 YYLTYPE loc = this->get_location(); 2943 2944 _mesa_glsl_error(&loc, state, "function `%s' parameter `%s' " 2945 "qualifiers don't match prototype", name, badvar); 2946 } 2947 2948 if (sig->return_type != return_type) { 2949 YYLTYPE loc = this->get_location(); 2950 2951 _mesa_glsl_error(&loc, state, "function `%s' return type doesn't " 2952 "match prototype", name); 2953 } 2954 2955 if (is_definition && sig->is_defined) { 2956 YYLTYPE loc = this->get_location(); 2957 2958 _mesa_glsl_error(& loc, state, "function `%s' redefined", name); 2959 } 2960 } 2961 } else { 2962 f = new(ctx) ir_function(name); 2963 if (!state->symbols->add_function(f)) { 2964 /* This function name shadows a non-function use of the same name. */ 2965 YYLTYPE loc = this->get_location(); 2966 2967 _mesa_glsl_error(&loc, state, "function name `%s' conflicts with " 2968 "non-function", name); 2969 return NULL; 2970 } 2971 2972 emit_function(state, instructions, f); 2973 } 2974 2975 /* Verify the return type of main() */ 2976 if (strcmp(name, "main") == 0) { 2977 if (! return_type->is_void()) { 2978 YYLTYPE loc = this->get_location(); 2979 2980 _mesa_glsl_error(& loc, state, "main() must return void"); 2981 } 2982 2983 if (!hir_parameters.is_empty()) { 2984 YYLTYPE loc = this->get_location(); 2985 2986 _mesa_glsl_error(& loc, state, "main() must not take any parameters"); 2987 } 2988 } 2989 2990 /* Finish storing the information about this new function in its signature. 2991 */ 2992 if (sig == NULL) { 2993 sig = new(ctx) ir_function_signature(return_type); 2994 f->add_signature(sig); 2995 } 2996 2997 sig->replace_parameters(&hir_parameters); 2998 signature = sig; 2999 3000 /* Function declarations (prototypes) do not have r-values. 3001 */ 3002 return NULL; 3003} 3004 3005 3006ir_rvalue * 3007ast_function_definition::hir(exec_list *instructions, 3008 struct _mesa_glsl_parse_state *state) 3009{ 3010 prototype->is_definition = true; 3011 prototype->hir(instructions, state); 3012 3013 ir_function_signature *signature = prototype->signature; 3014 if (signature == NULL) 3015 return NULL; 3016 3017 assert(state->current_function == NULL); 3018 state->current_function = signature; 3019 state->found_return = false; 3020 3021 /* Duplicate parameters declared in the prototype as concrete variables. 3022 * Add these to the symbol table. 3023 */ 3024 state->symbols->push_scope(); 3025 foreach_iter(exec_list_iterator, iter, signature->parameters) { 3026 ir_variable *const var = ((ir_instruction *) iter.get())->as_variable(); 3027 3028 assert(var != NULL); 3029 3030 /* The only way a parameter would "exist" is if two parameters have 3031 * the same name. 3032 */ 3033 if (state->symbols->name_declared_this_scope(var->name)) { 3034 YYLTYPE loc = this->get_location(); 3035 3036 _mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name); 3037 } else { 3038 state->symbols->add_variable(var); 3039 } 3040 } 3041 3042 /* Convert the body of the function to HIR. */ 3043 this->body->hir(&signature->body, state); 3044 signature->is_defined = true; 3045 3046 state->symbols->pop_scope(); 3047 3048 assert(state->current_function == signature); 3049 state->current_function = NULL; 3050 3051 if (!signature->return_type->is_void() && !state->found_return) { 3052 YYLTYPE loc = this->get_location(); 3053 _mesa_glsl_error(& loc, state, "function `%s' has non-void return type " 3054 "%s, but no return statement", 3055 signature->function_name(), 3056 signature->return_type->name); 3057 } 3058 3059 /* Function definitions do not have r-values. 3060 */ 3061 return NULL; 3062} 3063 3064 3065ir_rvalue * 3066ast_jump_statement::hir(exec_list *instructions, 3067 struct _mesa_glsl_parse_state *state) 3068{ 3069 void *ctx = state; 3070 3071 switch (mode) { 3072 case ast_return: { 3073 ir_return *inst; 3074 assert(state->current_function); 3075 3076 if (opt_return_value) { 3077 ir_rvalue *const ret = opt_return_value->hir(instructions, state); 3078 3079 /* The value of the return type can be NULL if the shader says 3080 * 'return foo();' and foo() is a function that returns void. 3081 * 3082 * NOTE: The GLSL spec doesn't say that this is an error. The type 3083 * of the return value is void. If the return type of the function is 3084 * also void, then this should compile without error. Seriously. 3085 */ 3086 const glsl_type *const ret_type = 3087 (ret == NULL) ? glsl_type::void_type : ret->type; 3088 3089 /* Implicit conversions are not allowed for return values. */ 3090 if (state->current_function->return_type != ret_type) { 3091 YYLTYPE loc = this->get_location(); 3092 3093 _mesa_glsl_error(& loc, state, 3094 "`return' with wrong type %s, in function `%s' " 3095 "returning %s", 3096 ret_type->name, 3097 state->current_function->function_name(), 3098 state->current_function->return_type->name); 3099 } 3100 3101 inst = new(ctx) ir_return(ret); 3102 } else { 3103 if (state->current_function->return_type->base_type != 3104 GLSL_TYPE_VOID) { 3105 YYLTYPE loc = this->get_location(); 3106 3107 _mesa_glsl_error(& loc, state, 3108 "`return' with no value, in function %s returning " 3109 "non-void", 3110 state->current_function->function_name()); 3111 } 3112 inst = new(ctx) ir_return; 3113 } 3114 3115 state->found_return = true; 3116 instructions->push_tail(inst); 3117 break; 3118 } 3119 3120 case ast_discard: 3121 if (state->target != fragment_shader) { 3122 YYLTYPE loc = this->get_location(); 3123 3124 _mesa_glsl_error(& loc, state, 3125 "`discard' may only appear in a fragment shader"); 3126 } 3127 instructions->push_tail(new(ctx) ir_discard); 3128 break; 3129 3130 case ast_break: 3131 case ast_continue: 3132 /* FINISHME: Handle switch-statements. They cannot contain 'continue', 3133 * FINISHME: and they use a different IR instruction for 'break'. 3134 */ 3135 /* FINISHME: Correctly handle the nesting. If a switch-statement is 3136 * FINISHME: inside a loop, a 'continue' is valid and will bind to the 3137 * FINISHME: loop. 3138 */ 3139 if (state->loop_or_switch_nesting == NULL) { 3140 YYLTYPE loc = this->get_location(); 3141 3142 _mesa_glsl_error(& loc, state, 3143 "`%s' may only appear in a loop", 3144 (mode == ast_break) ? "break" : "continue"); 3145 } else { 3146 ir_loop *const loop = state->loop_or_switch_nesting->as_loop(); 3147 3148 /* Inline the for loop expression again, since we don't know 3149 * where near the end of the loop body the normal copy of it 3150 * is going to be placed. 3151 */ 3152 if (mode == ast_continue && 3153 state->loop_or_switch_nesting_ast->rest_expression) { 3154 state->loop_or_switch_nesting_ast->rest_expression->hir(instructions, 3155 state); 3156 } 3157 3158 if (loop != NULL) { 3159 ir_loop_jump *const jump = 3160 new(ctx) ir_loop_jump((mode == ast_break) 3161 ? ir_loop_jump::jump_break 3162 : ir_loop_jump::jump_continue); 3163 instructions->push_tail(jump); 3164 } 3165 } 3166 3167 break; 3168 } 3169 3170 /* Jump instructions do not have r-values. 3171 */ 3172 return NULL; 3173} 3174 3175 3176ir_rvalue * 3177ast_selection_statement::hir(exec_list *instructions, 3178 struct _mesa_glsl_parse_state *state) 3179{ 3180 void *ctx = state; 3181 3182 ir_rvalue *const condition = this->condition->hir(instructions, state); 3183 3184 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec: 3185 * 3186 * "Any expression whose type evaluates to a Boolean can be used as the 3187 * conditional expression bool-expression. Vector types are not accepted 3188 * as the expression to if." 3189 * 3190 * The checks are separated so that higher quality diagnostics can be 3191 * generated for cases where both rules are violated. 3192 */ 3193 if (!condition->type->is_boolean() || !condition->type->is_scalar()) { 3194 YYLTYPE loc = this->condition->get_location(); 3195 3196 _mesa_glsl_error(& loc, state, "if-statement condition must be scalar " 3197 "boolean"); 3198 } 3199 3200 ir_if *const stmt = new(ctx) ir_if(condition); 3201 3202 if (then_statement != NULL) { 3203 state->symbols->push_scope(); 3204 then_statement->hir(& stmt->then_instructions, state); 3205 state->symbols->pop_scope(); 3206 } 3207 3208 if (else_statement != NULL) { 3209 state->symbols->push_scope(); 3210 else_statement->hir(& stmt->else_instructions, state); 3211 state->symbols->pop_scope(); 3212 } 3213 3214 instructions->push_tail(stmt); 3215 3216 /* if-statements do not have r-values. 3217 */ 3218 return NULL; 3219} 3220 3221 3222void 3223ast_iteration_statement::condition_to_hir(ir_loop *stmt, 3224 struct _mesa_glsl_parse_state *state) 3225{ 3226 void *ctx = state; 3227 3228 if (condition != NULL) { 3229 ir_rvalue *const cond = 3230 condition->hir(& stmt->body_instructions, state); 3231 3232 if ((cond == NULL) 3233 || !cond->type->is_boolean() || !cond->type->is_scalar()) { 3234 YYLTYPE loc = condition->get_location(); 3235 3236 _mesa_glsl_error(& loc, state, 3237 "loop condition must be scalar boolean"); 3238 } else { 3239 /* As the first code in the loop body, generate a block that looks 3240 * like 'if (!condition) break;' as the loop termination condition. 3241 */ 3242 ir_rvalue *const not_cond = 3243 new(ctx) ir_expression(ir_unop_logic_not, glsl_type::bool_type, cond, 3244 NULL); 3245 3246 ir_if *const if_stmt = new(ctx) ir_if(not_cond); 3247 3248 ir_jump *const break_stmt = 3249 new(ctx) ir_loop_jump(ir_loop_jump::jump_break); 3250 3251 if_stmt->then_instructions.push_tail(break_stmt); 3252 stmt->body_instructions.push_tail(if_stmt); 3253 } 3254 } 3255} 3256 3257 3258ir_rvalue * 3259ast_iteration_statement::hir(exec_list *instructions, 3260 struct _mesa_glsl_parse_state *state) 3261{ 3262 void *ctx = state; 3263 3264 /* For-loops and while-loops start a new scope, but do-while loops do not. 3265 */ 3266 if (mode != ast_do_while) 3267 state->symbols->push_scope(); 3268 3269 if (init_statement != NULL) 3270 init_statement->hir(instructions, state); 3271 3272 ir_loop *const stmt = new(ctx) ir_loop(); 3273 instructions->push_tail(stmt); 3274 3275 /* Track the current loop and / or switch-statement nesting. 3276 */ 3277 ir_instruction *const nesting = state->loop_or_switch_nesting; 3278 ast_iteration_statement *nesting_ast = state->loop_or_switch_nesting_ast; 3279 3280 state->loop_or_switch_nesting = stmt; 3281 state->loop_or_switch_nesting_ast = this; 3282 3283 if (mode != ast_do_while) 3284 condition_to_hir(stmt, state); 3285 3286 if (body != NULL) 3287 body->hir(& stmt->body_instructions, state); 3288 3289 if (rest_expression != NULL) 3290 rest_expression->hir(& stmt->body_instructions, state); 3291 3292 if (mode == ast_do_while) 3293 condition_to_hir(stmt, state); 3294 3295 if (mode != ast_do_while) 3296 state->symbols->pop_scope(); 3297 3298 /* Restore previous nesting before returning. 3299 */ 3300 state->loop_or_switch_nesting = nesting; 3301 state->loop_or_switch_nesting_ast = nesting_ast; 3302 3303 /* Loops do not have r-values. 3304 */ 3305 return NULL; 3306} 3307 3308 3309ir_rvalue * 3310ast_type_specifier::hir(exec_list *instructions, 3311 struct _mesa_glsl_parse_state *state) 3312{ 3313 if (!this->is_precision_statement && this->structure == NULL) 3314 return NULL; 3315 3316 YYLTYPE loc = this->get_location(); 3317 3318 if (this->precision != ast_precision_none 3319 && state->language_version != 100 3320 && state->language_version < 130) { 3321 _mesa_glsl_error(&loc, state, 3322 "precision qualifiers exist only in " 3323 "GLSL ES 1.00, and GLSL 1.30 and later"); 3324 return NULL; 3325 } 3326 if (this->precision != ast_precision_none 3327 && this->structure != NULL) { 3328 _mesa_glsl_error(&loc, state, 3329 "precision qualifiers do not apply to structures"); 3330 return NULL; 3331 } 3332 3333 /* If this is a precision statement, check that the type to which it is 3334 * applied is either float or int. 3335 * 3336 * From section 4.5.3 of the GLSL 1.30 spec: 3337 * "The precision statement 3338 * precision precision-qualifier type; 3339 * can be used to establish a default precision qualifier. The type 3340 * field can be either int or float [...]. Any other types or 3341 * qualifiers will result in an error. 3342 */ 3343 if (this->is_precision_statement) { 3344 assert(this->precision != ast_precision_none); 3345 assert(this->structure == NULL); /* The check for structures was 3346 * performed above. */ 3347 if (this->is_array) { 3348 _mesa_glsl_error(&loc, state, 3349 "default precision statements do not apply to " 3350 "arrays"); 3351 return NULL; 3352 } 3353 if (this->type_specifier != ast_float 3354 && this->type_specifier != ast_int) { 3355 _mesa_glsl_error(&loc, state, 3356 "default precision statements apply only to types " 3357 "float and int"); 3358 return NULL; 3359 } 3360 3361 /* FINISHME: Translate precision statements into IR. */ 3362 return NULL; 3363 } 3364 3365 if (this->structure != NULL) 3366 return this->structure->hir(instructions, state); 3367 3368 return NULL; 3369} 3370 3371 3372ir_rvalue * 3373ast_struct_specifier::hir(exec_list *instructions, 3374 struct _mesa_glsl_parse_state *state) 3375{ 3376 unsigned decl_count = 0; 3377 3378 /* Make an initial pass over the list of structure fields to determine how 3379 * many there are. Each element in this list is an ast_declarator_list. 3380 * This means that we actually need to count the number of elements in the 3381 * 'declarations' list in each of the elements. 3382 */ 3383 foreach_list_typed (ast_declarator_list, decl_list, link, 3384 &this->declarations) { 3385 foreach_list_const (decl_ptr, & decl_list->declarations) { 3386 decl_count++; 3387 } 3388 } 3389 3390 /* Allocate storage for the structure fields and process the field 3391 * declarations. As the declarations are processed, try to also convert 3392 * the types to HIR. This ensures that structure definitions embedded in 3393 * other structure definitions are processed. 3394 */ 3395 glsl_struct_field *const fields = talloc_array(state, glsl_struct_field, 3396 decl_count); 3397 3398 unsigned i = 0; 3399 foreach_list_typed (ast_declarator_list, decl_list, link, 3400 &this->declarations) { 3401 const char *type_name; 3402 3403 decl_list->type->specifier->hir(instructions, state); 3404 3405 /* Section 10.9 of the GLSL ES 1.00 specification states that 3406 * embedded structure definitions have been removed from the language. 3407 */ 3408 if (state->es_shader && decl_list->type->specifier->structure != NULL) { 3409 YYLTYPE loc = this->get_location(); 3410 _mesa_glsl_error(&loc, state, "Embedded structure definitions are " 3411 "not allowed in GLSL ES 1.00."); 3412 } 3413 3414 const glsl_type *decl_type = 3415 decl_list->type->specifier->glsl_type(& type_name, state); 3416 3417 foreach_list_typed (ast_declaration, decl, link, 3418 &decl_list->declarations) { 3419 const struct glsl_type *field_type = decl_type; 3420 if (decl->is_array) { 3421 YYLTYPE loc = decl->get_location(); 3422 field_type = process_array_type(&loc, decl_type, decl->array_size, 3423 state); 3424 } 3425 fields[i].type = (field_type != NULL) 3426 ? field_type : glsl_type::error_type; 3427 fields[i].name = decl->identifier; 3428 i++; 3429 } 3430 } 3431 3432 assert(i == decl_count); 3433 3434 const glsl_type *t = 3435 glsl_type::get_record_instance(fields, decl_count, this->name); 3436 3437 YYLTYPE loc = this->get_location(); 3438 if (!state->symbols->add_type(name, t)) { 3439 _mesa_glsl_error(& loc, state, "struct `%s' previously defined", name); 3440 } else { 3441 3442 const glsl_type **s = (const glsl_type **) 3443 realloc(state->user_structures, 3444 sizeof(state->user_structures[0]) * 3445 (state->num_user_structures + 1)); 3446 if (s != NULL) { 3447 s[state->num_user_structures] = t; 3448 state->user_structures = s; 3449 state->num_user_structures++; 3450 } 3451 } 3452 3453 /* Structure type definitions do not have r-values. 3454 */ 3455 return NULL; 3456} 3457