ast_to_hir.cpp revision f07221056e1822187546b76387714b3172f9b2c5
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 if (state->language_version < 130) { 439 _mesa_glsl_error(loc, state, 440 "operator '%%' is reserved in %s", 441 state->version_string); 442 return glsl_type::error_type; 443 } 444 445 /* From GLSL 1.50 spec, page 56: 446 * "The operator modulus (%) operates on signed or unsigned integers or 447 * integer vectors. The operand types must both be signed or both be 448 * unsigned." 449 */ 450 if (!type_a->is_integer()) { 451 _mesa_glsl_error(loc, state, "LHS of operator %% must be an integer."); 452 return glsl_type::error_type; 453 } 454 if (!type_b->is_integer()) { 455 _mesa_glsl_error(loc, state, "RHS of operator %% must be an integer."); 456 return glsl_type::error_type; 457 } 458 if (type_a->base_type != type_b->base_type) { 459 _mesa_glsl_error(loc, state, 460 "operands of %% must have the same base type"); 461 return glsl_type::error_type; 462 } 463 464 /* "The operands cannot be vectors of differing size. If one operand is 465 * a scalar and the other vector, then the scalar is applied component- 466 * wise to the vector, resulting in the same type as the vector. If both 467 * are vectors of the same size, the result is computed component-wise." 468 */ 469 if (type_a->is_vector()) { 470 if (!type_b->is_vector() 471 || (type_a->vector_elements == type_b->vector_elements)) 472 return type_a; 473 } else 474 return type_b; 475 476 /* "The operator modulus (%) is not defined for any other data types 477 * (non-integer types)." 478 */ 479 _mesa_glsl_error(loc, state, "type mismatch"); 480 return glsl_type::error_type; 481} 482 483 484static const struct glsl_type * 485relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b, 486 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 487{ 488 const glsl_type *type_a = value_a->type; 489 const glsl_type *type_b = value_b->type; 490 491 /* From GLSL 1.50 spec, page 56: 492 * "The relational operators greater than (>), less than (<), greater 493 * than or equal (>=), and less than or equal (<=) operate only on 494 * scalar integer and scalar floating-point expressions." 495 */ 496 if (!type_a->is_numeric() 497 || !type_b->is_numeric() 498 || !type_a->is_scalar() 499 || !type_b->is_scalar()) { 500 _mesa_glsl_error(loc, state, 501 "Operands to relational operators must be scalar and " 502 "numeric"); 503 return glsl_type::error_type; 504 } 505 506 /* "Either the operands' types must match, or the conversions from 507 * Section 4.1.10 "Implicit Conversions" will be applied to the integer 508 * operand, after which the types must match." 509 */ 510 if (!apply_implicit_conversion(type_a, value_b, state) 511 && !apply_implicit_conversion(type_b, value_a, state)) { 512 _mesa_glsl_error(loc, state, 513 "Could not implicitly convert operands to " 514 "relational operator"); 515 return glsl_type::error_type; 516 } 517 type_a = value_a->type; 518 type_b = value_b->type; 519 520 if (type_a->base_type != type_b->base_type) { 521 _mesa_glsl_error(loc, state, "base type mismatch"); 522 return glsl_type::error_type; 523 } 524 525 /* "The result is scalar Boolean." 526 */ 527 return glsl_type::bool_type; 528} 529 530/** 531 * \brief Return the result type of a bit-shift operation. 532 * 533 * If the given types to the bit-shift operator are invalid, return 534 * glsl_type::error_type. 535 * 536 * \param type_a Type of LHS of bit-shift op 537 * \param type_b Type of RHS of bit-shift op 538 */ 539static const struct glsl_type * 540shift_result_type(const struct glsl_type *type_a, 541 const struct glsl_type *type_b, 542 ast_operators op, 543 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 544{ 545 if (state->language_version < 130) { 546 _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30"); 547 return glsl_type::error_type; 548 } 549 550 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec: 551 * 552 * "The shift operators (<<) and (>>). For both operators, the operands 553 * must be signed or unsigned integers or integer vectors. One operand 554 * can be signed while the other is unsigned." 555 */ 556 if (!type_a->is_integer()) { 557 _mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or " 558 "integer vector", ast_expression::operator_string(op)); 559 return glsl_type::error_type; 560 561 } 562 if (!type_b->is_integer()) { 563 _mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or " 564 "integer vector", ast_expression::operator_string(op)); 565 return glsl_type::error_type; 566 } 567 568 /* "If the first operand is a scalar, the second operand has to be 569 * a scalar as well." 570 */ 571 if (type_a->is_scalar() && !type_b->is_scalar()) { 572 _mesa_glsl_error(loc, state, "If the first operand of %s is scalar, the " 573 "second must be scalar as well", 574 ast_expression::operator_string(op)); 575 return glsl_type::error_type; 576 } 577 578 /* If both operands are vectors, check that they have same number of 579 * elements. 580 */ 581 if (type_a->is_vector() && 582 type_b->is_vector() && 583 type_a->vector_elements != type_b->vector_elements) { 584 _mesa_glsl_error(loc, state, "Vector operands to operator %s must " 585 "have same number of elements", 586 ast_expression::operator_string(op)); 587 return glsl_type::error_type; 588 } 589 590 /* "In all cases, the resulting type will be the same type as the left 591 * operand." 592 */ 593 return type_a; 594} 595 596/** 597 * Validates that a value can be assigned to a location with a specified type 598 * 599 * Validates that \c rhs can be assigned to some location. If the types are 600 * not an exact match but an automatic conversion is possible, \c rhs will be 601 * converted. 602 * 603 * \return 604 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type. 605 * Otherwise the actual RHS to be assigned will be returned. This may be 606 * \c rhs, or it may be \c rhs after some type conversion. 607 * 608 * \note 609 * In addition to being used for assignments, this function is used to 610 * type-check return values. 611 */ 612ir_rvalue * 613validate_assignment(struct _mesa_glsl_parse_state *state, 614 const glsl_type *lhs_type, ir_rvalue *rhs, 615 bool is_initializer) 616{ 617 /* If there is already some error in the RHS, just return it. Anything 618 * else will lead to an avalanche of error message back to the user. 619 */ 620 if (rhs->type->is_error()) 621 return rhs; 622 623 /* If the types are identical, the assignment can trivially proceed. 624 */ 625 if (rhs->type == lhs_type) 626 return rhs; 627 628 /* If the array element types are the same and the size of the LHS is zero, 629 * the assignment is okay for initializers embedded in variable 630 * declarations. 631 * 632 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this 633 * is handled by ir_dereference::is_lvalue. 634 */ 635 if (is_initializer && lhs_type->is_array() && rhs->type->is_array() 636 && (lhs_type->element_type() == rhs->type->element_type()) 637 && (lhs_type->array_size() == 0)) { 638 return rhs; 639 } 640 641 /* Check for implicit conversion in GLSL 1.20 */ 642 if (apply_implicit_conversion(lhs_type, rhs, state)) { 643 if (rhs->type == lhs_type) 644 return rhs; 645 } 646 647 return NULL; 648} 649 650ir_rvalue * 651do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state, 652 ir_rvalue *lhs, ir_rvalue *rhs, bool is_initializer, 653 YYLTYPE lhs_loc) 654{ 655 void *ctx = state; 656 bool error_emitted = (lhs->type->is_error() || rhs->type->is_error()); 657 658 if (!error_emitted) { 659 if (lhs->variable_referenced() != NULL 660 && lhs->variable_referenced()->read_only) { 661 _mesa_glsl_error(&lhs_loc, state, 662 "assignment to read-only variable '%s'", 663 lhs->variable_referenced()->name); 664 error_emitted = true; 665 666 } else if (!lhs->is_lvalue()) { 667 _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment"); 668 error_emitted = true; 669 } 670 671 if (state->es_shader && lhs->type->is_array()) { 672 _mesa_glsl_error(&lhs_loc, state, "whole array assignment is not " 673 "allowed in GLSL ES 1.00."); 674 error_emitted = true; 675 } 676 } 677 678 ir_rvalue *new_rhs = 679 validate_assignment(state, lhs->type, rhs, is_initializer); 680 if (new_rhs == NULL) { 681 _mesa_glsl_error(& lhs_loc, state, "type mismatch"); 682 } else { 683 rhs = new_rhs; 684 685 /* If the LHS array was not declared with a size, it takes it size from 686 * the RHS. If the LHS is an l-value and a whole array, it must be a 687 * dereference of a variable. Any other case would require that the LHS 688 * is either not an l-value or not a whole array. 689 */ 690 if (lhs->type->array_size() == 0) { 691 ir_dereference *const d = lhs->as_dereference(); 692 693 assert(d != NULL); 694 695 ir_variable *const var = d->variable_referenced(); 696 697 assert(var != NULL); 698 699 if (var->max_array_access >= unsigned(rhs->type->array_size())) { 700 /* FINISHME: This should actually log the location of the RHS. */ 701 _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to " 702 "previous access", 703 var->max_array_access); 704 } 705 706 var->type = glsl_type::get_array_instance(lhs->type->element_type(), 707 rhs->type->array_size()); 708 d->type = var->type; 709 } 710 } 711 712 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec, 713 * but not post_inc) need the converted assigned value as an rvalue 714 * to handle things like: 715 * 716 * i = j += 1; 717 * 718 * So we always just store the computed value being assigned to a 719 * temporary and return a deref of that temporary. If the rvalue 720 * ends up not being used, the temp will get copy-propagated out. 721 */ 722 ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp", 723 ir_var_temporary); 724 ir_dereference_variable *deref_var = new(ctx) ir_dereference_variable(var); 725 instructions->push_tail(var); 726 instructions->push_tail(new(ctx) ir_assignment(deref_var, 727 rhs, 728 NULL)); 729 deref_var = new(ctx) ir_dereference_variable(var); 730 731 if (!error_emitted) 732 instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var, NULL)); 733 734 return new(ctx) ir_dereference_variable(var); 735} 736 737static ir_rvalue * 738get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue) 739{ 740 void *ctx = ralloc_parent(lvalue); 741 ir_variable *var; 742 743 var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp", 744 ir_var_temporary); 745 instructions->push_tail(var); 746 var->mode = ir_var_auto; 747 748 instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var), 749 lvalue, NULL)); 750 751 /* Once we've created this temporary, mark it read only so it's no 752 * longer considered an lvalue. 753 */ 754 var->read_only = true; 755 756 return new(ctx) ir_dereference_variable(var); 757} 758 759 760ir_rvalue * 761ast_node::hir(exec_list *instructions, 762 struct _mesa_glsl_parse_state *state) 763{ 764 (void) instructions; 765 (void) state; 766 767 return NULL; 768} 769 770static void 771mark_whole_array_access(ir_rvalue *access) 772{ 773 ir_dereference_variable *deref = access->as_dereference_variable(); 774 775 if (deref) { 776 deref->var->max_array_access = deref->type->length - 1; 777 } 778} 779 780static ir_rvalue * 781do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1) 782{ 783 int join_op; 784 ir_rvalue *cmp = NULL; 785 786 if (operation == ir_binop_all_equal) 787 join_op = ir_binop_logic_and; 788 else 789 join_op = ir_binop_logic_or; 790 791 switch (op0->type->base_type) { 792 case GLSL_TYPE_FLOAT: 793 case GLSL_TYPE_UINT: 794 case GLSL_TYPE_INT: 795 case GLSL_TYPE_BOOL: 796 return new(mem_ctx) ir_expression(operation, op0, op1); 797 798 case GLSL_TYPE_ARRAY: { 799 for (unsigned int i = 0; i < op0->type->length; i++) { 800 ir_rvalue *e0, *e1, *result; 801 802 e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL), 803 new(mem_ctx) ir_constant(i)); 804 e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL), 805 new(mem_ctx) ir_constant(i)); 806 result = do_comparison(mem_ctx, operation, e0, e1); 807 808 if (cmp) { 809 cmp = new(mem_ctx) ir_expression(join_op, cmp, result); 810 } else { 811 cmp = result; 812 } 813 } 814 815 mark_whole_array_access(op0); 816 mark_whole_array_access(op1); 817 break; 818 } 819 820 case GLSL_TYPE_STRUCT: { 821 for (unsigned int i = 0; i < op0->type->length; i++) { 822 ir_rvalue *e0, *e1, *result; 823 const char *field_name = op0->type->fields.structure[i].name; 824 825 e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL), 826 field_name); 827 e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL), 828 field_name); 829 result = do_comparison(mem_ctx, operation, e0, e1); 830 831 if (cmp) { 832 cmp = new(mem_ctx) ir_expression(join_op, cmp, result); 833 } else { 834 cmp = result; 835 } 836 } 837 break; 838 } 839 840 case GLSL_TYPE_ERROR: 841 case GLSL_TYPE_VOID: 842 case GLSL_TYPE_SAMPLER: 843 /* I assume a comparison of a struct containing a sampler just 844 * ignores the sampler present in the type. 845 */ 846 break; 847 848 default: 849 assert(!"Should not get here."); 850 break; 851 } 852 853 if (cmp == NULL) 854 cmp = new(mem_ctx) ir_constant(true); 855 856 return cmp; 857} 858 859/* For logical operations, we want to ensure that the operands are 860 * scalar booleans. If it isn't, emit an error and return a constant 861 * boolean to avoid triggering cascading error messages. 862 */ 863ir_rvalue * 864get_scalar_boolean_operand(exec_list *instructions, 865 struct _mesa_glsl_parse_state *state, 866 ast_expression *parent_expr, 867 int operand, 868 const char *operand_name, 869 bool *error_emitted) 870{ 871 ast_expression *expr = parent_expr->subexpressions[operand]; 872 void *ctx = state; 873 ir_rvalue *val = expr->hir(instructions, state); 874 875 if (val->type->is_boolean() && val->type->is_scalar()) 876 return val; 877 878 if (!*error_emitted) { 879 YYLTYPE loc = expr->get_location(); 880 _mesa_glsl_error(&loc, state, "%s of `%s' must be scalar boolean", 881 operand_name, 882 parent_expr->operator_string(parent_expr->oper)); 883 *error_emitted = true; 884 } 885 886 return new(ctx) ir_constant(true); 887} 888 889ir_rvalue * 890ast_expression::hir(exec_list *instructions, 891 struct _mesa_glsl_parse_state *state) 892{ 893 void *ctx = state; 894 static const int operations[AST_NUM_OPERATORS] = { 895 -1, /* ast_assign doesn't convert to ir_expression. */ 896 -1, /* ast_plus doesn't convert to ir_expression. */ 897 ir_unop_neg, 898 ir_binop_add, 899 ir_binop_sub, 900 ir_binop_mul, 901 ir_binop_div, 902 ir_binop_mod, 903 ir_binop_lshift, 904 ir_binop_rshift, 905 ir_binop_less, 906 ir_binop_greater, 907 ir_binop_lequal, 908 ir_binop_gequal, 909 ir_binop_all_equal, 910 ir_binop_any_nequal, 911 ir_binop_bit_and, 912 ir_binop_bit_xor, 913 ir_binop_bit_or, 914 ir_unop_bit_not, 915 ir_binop_logic_and, 916 ir_binop_logic_xor, 917 ir_binop_logic_or, 918 ir_unop_logic_not, 919 920 /* Note: The following block of expression types actually convert 921 * to multiple IR instructions. 922 */ 923 ir_binop_mul, /* ast_mul_assign */ 924 ir_binop_div, /* ast_div_assign */ 925 ir_binop_mod, /* ast_mod_assign */ 926 ir_binop_add, /* ast_add_assign */ 927 ir_binop_sub, /* ast_sub_assign */ 928 ir_binop_lshift, /* ast_ls_assign */ 929 ir_binop_rshift, /* ast_rs_assign */ 930 ir_binop_bit_and, /* ast_and_assign */ 931 ir_binop_bit_xor, /* ast_xor_assign */ 932 ir_binop_bit_or, /* ast_or_assign */ 933 934 -1, /* ast_conditional doesn't convert to ir_expression. */ 935 ir_binop_add, /* ast_pre_inc. */ 936 ir_binop_sub, /* ast_pre_dec. */ 937 ir_binop_add, /* ast_post_inc. */ 938 ir_binop_sub, /* ast_post_dec. */ 939 -1, /* ast_field_selection doesn't conv to ir_expression. */ 940 -1, /* ast_array_index doesn't convert to ir_expression. */ 941 -1, /* ast_function_call doesn't conv to ir_expression. */ 942 -1, /* ast_identifier doesn't convert to ir_expression. */ 943 -1, /* ast_int_constant doesn't convert to ir_expression. */ 944 -1, /* ast_uint_constant doesn't conv to ir_expression. */ 945 -1, /* ast_float_constant doesn't conv to ir_expression. */ 946 -1, /* ast_bool_constant doesn't conv to ir_expression. */ 947 -1, /* ast_sequence doesn't convert to ir_expression. */ 948 }; 949 ir_rvalue *result = NULL; 950 ir_rvalue *op[3]; 951 const struct glsl_type *type; /* a temporary variable for switch cases */ 952 bool error_emitted = false; 953 YYLTYPE loc; 954 955 loc = this->get_location(); 956 957 switch (this->oper) { 958 case ast_assign: { 959 op[0] = this->subexpressions[0]->hir(instructions, state); 960 op[1] = this->subexpressions[1]->hir(instructions, state); 961 962 result = do_assignment(instructions, state, op[0], op[1], false, 963 this->subexpressions[0]->get_location()); 964 error_emitted = result->type->is_error(); 965 break; 966 } 967 968 case ast_plus: 969 op[0] = this->subexpressions[0]->hir(instructions, state); 970 971 type = unary_arithmetic_result_type(op[0]->type, state, & loc); 972 973 error_emitted = type->is_error(); 974 975 result = op[0]; 976 break; 977 978 case ast_neg: 979 op[0] = this->subexpressions[0]->hir(instructions, state); 980 981 type = unary_arithmetic_result_type(op[0]->type, state, & loc); 982 983 error_emitted = type->is_error(); 984 985 result = new(ctx) ir_expression(operations[this->oper], type, 986 op[0], NULL); 987 break; 988 989 case ast_add: 990 case ast_sub: 991 case ast_mul: 992 case ast_div: 993 op[0] = this->subexpressions[0]->hir(instructions, state); 994 op[1] = this->subexpressions[1]->hir(instructions, state); 995 996 type = arithmetic_result_type(op[0], op[1], 997 (this->oper == ast_mul), 998 state, & loc); 999 error_emitted = type->is_error(); 1000 1001 result = new(ctx) ir_expression(operations[this->oper], type, 1002 op[0], op[1]); 1003 break; 1004 1005 case ast_mod: 1006 op[0] = this->subexpressions[0]->hir(instructions, state); 1007 op[1] = this->subexpressions[1]->hir(instructions, state); 1008 1009 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc); 1010 1011 assert(operations[this->oper] == ir_binop_mod); 1012 1013 result = new(ctx) ir_expression(operations[this->oper], type, 1014 op[0], op[1]); 1015 error_emitted = type->is_error(); 1016 break; 1017 1018 case ast_lshift: 1019 case ast_rshift: 1020 if (state->language_version < 130) { 1021 _mesa_glsl_error(&loc, state, "operator %s requires GLSL 1.30", 1022 operator_string(this->oper)); 1023 error_emitted = true; 1024 } 1025 1026 op[0] = this->subexpressions[0]->hir(instructions, state); 1027 op[1] = this->subexpressions[1]->hir(instructions, state); 1028 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state, 1029 &loc); 1030 result = new(ctx) ir_expression(operations[this->oper], type, 1031 op[0], op[1]); 1032 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1033 break; 1034 1035 case ast_less: 1036 case ast_greater: 1037 case ast_lequal: 1038 case ast_gequal: 1039 op[0] = this->subexpressions[0]->hir(instructions, state); 1040 op[1] = this->subexpressions[1]->hir(instructions, state); 1041 1042 type = relational_result_type(op[0], op[1], state, & loc); 1043 1044 /* The relational operators must either generate an error or result 1045 * in a scalar boolean. See page 57 of the GLSL 1.50 spec. 1046 */ 1047 assert(type->is_error() 1048 || ((type->base_type == GLSL_TYPE_BOOL) 1049 && type->is_scalar())); 1050 1051 result = new(ctx) ir_expression(operations[this->oper], type, 1052 op[0], op[1]); 1053 error_emitted = type->is_error(); 1054 break; 1055 1056 case ast_nequal: 1057 case ast_equal: 1058 op[0] = this->subexpressions[0]->hir(instructions, state); 1059 op[1] = this->subexpressions[1]->hir(instructions, state); 1060 1061 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec: 1062 * 1063 * "The equality operators equal (==), and not equal (!=) 1064 * operate on all types. They result in a scalar Boolean. If 1065 * the operand types do not match, then there must be a 1066 * conversion from Section 4.1.10 "Implicit Conversions" 1067 * applied to one operand that can make them match, in which 1068 * case this conversion is done." 1069 */ 1070 if ((!apply_implicit_conversion(op[0]->type, op[1], state) 1071 && !apply_implicit_conversion(op[1]->type, op[0], state)) 1072 || (op[0]->type != op[1]->type)) { 1073 _mesa_glsl_error(& loc, state, "operands of `%s' must have the same " 1074 "type", (this->oper == ast_equal) ? "==" : "!="); 1075 error_emitted = true; 1076 } else if ((state->language_version <= 110) 1077 && (op[0]->type->is_array() || op[1]->type->is_array())) { 1078 _mesa_glsl_error(& loc, state, "array comparisons forbidden in " 1079 "GLSL 1.10"); 1080 error_emitted = true; 1081 } 1082 1083 if (error_emitted) { 1084 result = new(ctx) ir_constant(false); 1085 } else { 1086 result = do_comparison(ctx, operations[this->oper], op[0], op[1]); 1087 assert(result->type == glsl_type::bool_type); 1088 } 1089 break; 1090 1091 case ast_bit_and: 1092 case ast_bit_xor: 1093 case ast_bit_or: 1094 op[0] = this->subexpressions[0]->hir(instructions, state); 1095 op[1] = this->subexpressions[1]->hir(instructions, state); 1096 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper, 1097 state, &loc); 1098 result = new(ctx) ir_expression(operations[this->oper], type, 1099 op[0], op[1]); 1100 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1101 break; 1102 1103 case ast_bit_not: 1104 op[0] = this->subexpressions[0]->hir(instructions, state); 1105 1106 if (state->language_version < 130) { 1107 _mesa_glsl_error(&loc, state, "bit-wise operations require GLSL 1.30"); 1108 error_emitted = true; 1109 } 1110 1111 if (!op[0]->type->is_integer()) { 1112 _mesa_glsl_error(&loc, state, "operand of `~' must be an integer"); 1113 error_emitted = true; 1114 } 1115 1116 type = op[0]->type; 1117 result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL); 1118 break; 1119 1120 case ast_logic_and: { 1121 exec_list rhs_instructions; 1122 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, 1123 "LHS", &error_emitted); 1124 op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1, 1125 "RHS", &error_emitted); 1126 1127 ir_constant *op0_const = op[0]->constant_expression_value(); 1128 if (op0_const) { 1129 if (op0_const->value.b[0]) { 1130 instructions->append_list(&rhs_instructions); 1131 result = op[1]; 1132 } else { 1133 result = op0_const; 1134 } 1135 type = glsl_type::bool_type; 1136 } else { 1137 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type, 1138 "and_tmp", 1139 ir_var_temporary); 1140 instructions->push_tail(tmp); 1141 1142 ir_if *const stmt = new(ctx) ir_if(op[0]); 1143 instructions->push_tail(stmt); 1144 1145 stmt->then_instructions.append_list(&rhs_instructions); 1146 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp); 1147 ir_assignment *const then_assign = 1148 new(ctx) ir_assignment(then_deref, op[1], NULL); 1149 stmt->then_instructions.push_tail(then_assign); 1150 1151 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp); 1152 ir_assignment *const else_assign = 1153 new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false), NULL); 1154 stmt->else_instructions.push_tail(else_assign); 1155 1156 result = new(ctx) ir_dereference_variable(tmp); 1157 type = tmp->type; 1158 } 1159 break; 1160 } 1161 1162 case ast_logic_or: { 1163 exec_list rhs_instructions; 1164 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, 1165 "LHS", &error_emitted); 1166 op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1, 1167 "RHS", &error_emitted); 1168 1169 ir_constant *op0_const = op[0]->constant_expression_value(); 1170 if (op0_const) { 1171 if (op0_const->value.b[0]) { 1172 result = op0_const; 1173 } else { 1174 result = op[1]; 1175 } 1176 type = glsl_type::bool_type; 1177 } else { 1178 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type, 1179 "or_tmp", 1180 ir_var_temporary); 1181 instructions->push_tail(tmp); 1182 1183 ir_if *const stmt = new(ctx) ir_if(op[0]); 1184 instructions->push_tail(stmt); 1185 1186 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp); 1187 ir_assignment *const then_assign = 1188 new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true), NULL); 1189 stmt->then_instructions.push_tail(then_assign); 1190 1191 stmt->else_instructions.append_list(&rhs_instructions); 1192 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp); 1193 ir_assignment *const else_assign = 1194 new(ctx) ir_assignment(else_deref, op[1], NULL); 1195 stmt->else_instructions.push_tail(else_assign); 1196 1197 result = new(ctx) ir_dereference_variable(tmp); 1198 type = tmp->type; 1199 } 1200 break; 1201 } 1202 1203 case ast_logic_xor: 1204 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec: 1205 * 1206 * "The logical binary operators and (&&), or ( | | ), and 1207 * exclusive or (^^). They operate only on two Boolean 1208 * expressions and result in a Boolean expression." 1209 */ 1210 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, "LHS", 1211 &error_emitted); 1212 op[1] = get_scalar_boolean_operand(instructions, state, this, 1, "RHS", 1213 &error_emitted); 1214 1215 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type, 1216 op[0], op[1]); 1217 break; 1218 1219 case ast_logic_not: 1220 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, 1221 "operand", &error_emitted); 1222 1223 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type, 1224 op[0], NULL); 1225 break; 1226 1227 case ast_mul_assign: 1228 case ast_div_assign: 1229 case ast_add_assign: 1230 case ast_sub_assign: { 1231 op[0] = this->subexpressions[0]->hir(instructions, state); 1232 op[1] = this->subexpressions[1]->hir(instructions, state); 1233 1234 type = arithmetic_result_type(op[0], op[1], 1235 (this->oper == ast_mul_assign), 1236 state, & loc); 1237 1238 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1239 op[0], op[1]); 1240 1241 result = do_assignment(instructions, state, 1242 op[0]->clone(ctx, NULL), temp_rhs, false, 1243 this->subexpressions[0]->get_location()); 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, false, 1268 this->subexpressions[0]->get_location()); 1269 error_emitted = type->is_error(); 1270 break; 1271 } 1272 1273 case ast_ls_assign: 1274 case ast_rs_assign: { 1275 op[0] = this->subexpressions[0]->hir(instructions, state); 1276 op[1] = this->subexpressions[1]->hir(instructions, state); 1277 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state, 1278 &loc); 1279 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], 1280 type, op[0], op[1]); 1281 result = do_assignment(instructions, state, op[0]->clone(ctx, NULL), 1282 temp_rhs, false, 1283 this->subexpressions[0]->get_location()); 1284 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1285 break; 1286 } 1287 1288 case ast_and_assign: 1289 case ast_xor_assign: 1290 case ast_or_assign: { 1291 op[0] = this->subexpressions[0]->hir(instructions, state); 1292 op[1] = this->subexpressions[1]->hir(instructions, state); 1293 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper, 1294 state, &loc); 1295 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], 1296 type, op[0], op[1]); 1297 result = do_assignment(instructions, state, op[0]->clone(ctx, NULL), 1298 temp_rhs, false, 1299 this->subexpressions[0]->get_location()); 1300 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1301 break; 1302 } 1303 1304 case ast_conditional: { 1305 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec: 1306 * 1307 * "The ternary selection operator (?:). It operates on three 1308 * expressions (exp1 ? exp2 : exp3). This operator evaluates the 1309 * first expression, which must result in a scalar Boolean." 1310 */ 1311 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, 1312 "condition", &error_emitted); 1313 1314 /* The :? operator is implemented by generating an anonymous temporary 1315 * followed by an if-statement. The last instruction in each branch of 1316 * the if-statement assigns a value to the anonymous temporary. This 1317 * temporary is the r-value of the expression. 1318 */ 1319 exec_list then_instructions; 1320 exec_list else_instructions; 1321 1322 op[1] = this->subexpressions[1]->hir(&then_instructions, state); 1323 op[2] = this->subexpressions[2]->hir(&else_instructions, state); 1324 1325 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec: 1326 * 1327 * "The second and third expressions can be any type, as 1328 * long their types match, or there is a conversion in 1329 * Section 4.1.10 "Implicit Conversions" that can be applied 1330 * to one of the expressions to make their types match. This 1331 * resulting matching type is the type of the entire 1332 * expression." 1333 */ 1334 if ((!apply_implicit_conversion(op[1]->type, op[2], state) 1335 && !apply_implicit_conversion(op[2]->type, op[1], state)) 1336 || (op[1]->type != op[2]->type)) { 1337 YYLTYPE loc = this->subexpressions[1]->get_location(); 1338 1339 _mesa_glsl_error(& loc, state, "Second and third operands of ?: " 1340 "operator must have matching types."); 1341 error_emitted = true; 1342 type = glsl_type::error_type; 1343 } else { 1344 type = op[1]->type; 1345 } 1346 1347 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec: 1348 * 1349 * "The second and third expressions must be the same type, but can 1350 * be of any type other than an array." 1351 */ 1352 if ((state->language_version <= 110) && type->is_array()) { 1353 _mesa_glsl_error(& loc, state, "Second and third operands of ?: " 1354 "operator must not be arrays."); 1355 error_emitted = true; 1356 } 1357 1358 ir_constant *cond_val = op[0]->constant_expression_value(); 1359 ir_constant *then_val = op[1]->constant_expression_value(); 1360 ir_constant *else_val = op[2]->constant_expression_value(); 1361 1362 if (then_instructions.is_empty() 1363 && else_instructions.is_empty() 1364 && (cond_val != NULL) && (then_val != NULL) && (else_val != NULL)) { 1365 result = (cond_val->value.b[0]) ? then_val : else_val; 1366 } else { 1367 ir_variable *const tmp = 1368 new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary); 1369 instructions->push_tail(tmp); 1370 1371 ir_if *const stmt = new(ctx) ir_if(op[0]); 1372 instructions->push_tail(stmt); 1373 1374 then_instructions.move_nodes_to(& stmt->then_instructions); 1375 ir_dereference *const then_deref = 1376 new(ctx) ir_dereference_variable(tmp); 1377 ir_assignment *const then_assign = 1378 new(ctx) ir_assignment(then_deref, op[1], NULL); 1379 stmt->then_instructions.push_tail(then_assign); 1380 1381 else_instructions.move_nodes_to(& stmt->else_instructions); 1382 ir_dereference *const else_deref = 1383 new(ctx) ir_dereference_variable(tmp); 1384 ir_assignment *const else_assign = 1385 new(ctx) ir_assignment(else_deref, op[2], NULL); 1386 stmt->else_instructions.push_tail(else_assign); 1387 1388 result = new(ctx) ir_dereference_variable(tmp); 1389 } 1390 break; 1391 } 1392 1393 case ast_pre_inc: 1394 case ast_pre_dec: { 1395 op[0] = this->subexpressions[0]->hir(instructions, state); 1396 if (op[0]->type->base_type == GLSL_TYPE_FLOAT) 1397 op[1] = new(ctx) ir_constant(1.0f); 1398 else 1399 op[1] = new(ctx) ir_constant(1); 1400 1401 type = arithmetic_result_type(op[0], op[1], false, state, & loc); 1402 1403 ir_rvalue *temp_rhs; 1404 temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1405 op[0], op[1]); 1406 1407 result = do_assignment(instructions, state, 1408 op[0]->clone(ctx, NULL), temp_rhs, false, 1409 this->subexpressions[0]->get_location()); 1410 error_emitted = op[0]->type->is_error(); 1411 break; 1412 } 1413 1414 case ast_post_inc: 1415 case ast_post_dec: { 1416 op[0] = this->subexpressions[0]->hir(instructions, state); 1417 if (op[0]->type->base_type == GLSL_TYPE_FLOAT) 1418 op[1] = new(ctx) ir_constant(1.0f); 1419 else 1420 op[1] = new(ctx) ir_constant(1); 1421 1422 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1423 1424 type = arithmetic_result_type(op[0], op[1], false, state, & loc); 1425 1426 ir_rvalue *temp_rhs; 1427 temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1428 op[0], op[1]); 1429 1430 /* Get a temporary of a copy of the lvalue before it's modified. 1431 * This may get thrown away later. 1432 */ 1433 result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL)); 1434 1435 (void)do_assignment(instructions, state, 1436 op[0]->clone(ctx, NULL), temp_rhs, false, 1437 this->subexpressions[0]->get_location()); 1438 1439 error_emitted = op[0]->type->is_error(); 1440 break; 1441 } 1442 1443 case ast_field_selection: 1444 result = _mesa_ast_field_selection_to_hir(this, instructions, state); 1445 break; 1446 1447 case ast_array_index: { 1448 YYLTYPE index_loc = subexpressions[1]->get_location(); 1449 1450 op[0] = subexpressions[0]->hir(instructions, state); 1451 op[1] = subexpressions[1]->hir(instructions, state); 1452 1453 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1454 1455 ir_rvalue *const array = op[0]; 1456 1457 result = new(ctx) ir_dereference_array(op[0], op[1]); 1458 1459 /* Do not use op[0] after this point. Use array. 1460 */ 1461 op[0] = NULL; 1462 1463 1464 if (error_emitted) 1465 break; 1466 1467 if (!array->type->is_array() 1468 && !array->type->is_matrix() 1469 && !array->type->is_vector()) { 1470 _mesa_glsl_error(& index_loc, state, 1471 "cannot dereference non-array / non-matrix / " 1472 "non-vector"); 1473 error_emitted = true; 1474 } 1475 1476 if (!op[1]->type->is_integer()) { 1477 _mesa_glsl_error(& index_loc, state, 1478 "array index must be integer type"); 1479 error_emitted = true; 1480 } else if (!op[1]->type->is_scalar()) { 1481 _mesa_glsl_error(& index_loc, state, 1482 "array index must be scalar"); 1483 error_emitted = true; 1484 } 1485 1486 /* If the array index is a constant expression and the array has a 1487 * declared size, ensure that the access is in-bounds. If the array 1488 * index is not a constant expression, ensure that the array has a 1489 * declared size. 1490 */ 1491 ir_constant *const const_index = op[1]->constant_expression_value(); 1492 if (const_index != NULL) { 1493 const int idx = const_index->value.i[0]; 1494 const char *type_name; 1495 unsigned bound = 0; 1496 1497 if (array->type->is_matrix()) { 1498 type_name = "matrix"; 1499 } else if (array->type->is_vector()) { 1500 type_name = "vector"; 1501 } else { 1502 type_name = "array"; 1503 } 1504 1505 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec: 1506 * 1507 * "It is illegal to declare an array with a size, and then 1508 * later (in the same shader) index the same array with an 1509 * integral constant expression greater than or equal to the 1510 * declared size. It is also illegal to index an array with a 1511 * negative constant expression." 1512 */ 1513 if (array->type->is_matrix()) { 1514 if (array->type->row_type()->vector_elements <= idx) { 1515 bound = array->type->row_type()->vector_elements; 1516 } 1517 } else if (array->type->is_vector()) { 1518 if (array->type->vector_elements <= idx) { 1519 bound = array->type->vector_elements; 1520 } 1521 } else { 1522 if ((array->type->array_size() > 0) 1523 && (array->type->array_size() <= idx)) { 1524 bound = array->type->array_size(); 1525 } 1526 } 1527 1528 if (bound > 0) { 1529 _mesa_glsl_error(& loc, state, "%s index must be < %u", 1530 type_name, bound); 1531 error_emitted = true; 1532 } else if (idx < 0) { 1533 _mesa_glsl_error(& loc, state, "%s index must be >= 0", 1534 type_name); 1535 error_emitted = true; 1536 } 1537 1538 if (array->type->is_array()) { 1539 /* If the array is a variable dereference, it dereferences the 1540 * whole array, by definition. Use this to get the variable. 1541 * 1542 * FINISHME: Should some methods for getting / setting / testing 1543 * FINISHME: array access limits be added to ir_dereference? 1544 */ 1545 ir_variable *const v = array->whole_variable_referenced(); 1546 if ((v != NULL) && (unsigned(idx) > v->max_array_access)) 1547 v->max_array_access = idx; 1548 } 1549 } else if (array->type->array_size() == 0) { 1550 _mesa_glsl_error(&loc, state, "unsized array index must be constant"); 1551 } else { 1552 if (array->type->is_array()) { 1553 /* whole_variable_referenced can return NULL if the array is a 1554 * member of a structure. In this case it is safe to not update 1555 * the max_array_access field because it is never used for fields 1556 * of structures. 1557 */ 1558 ir_variable *v = array->whole_variable_referenced(); 1559 if (v != NULL) 1560 v->max_array_access = array->type->array_size() - 1; 1561 } 1562 } 1563 1564 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec: 1565 * 1566 * "Samplers aggregated into arrays within a shader (using square 1567 * brackets [ ]) can only be indexed with integral constant 1568 * expressions [...]." 1569 * 1570 * This restriction was added in GLSL 1.30. Shaders using earlier version 1571 * of the language should not be rejected by the compiler front-end for 1572 * using this construct. This allows useful things such as using a loop 1573 * counter as the index to an array of samplers. If the loop in unrolled, 1574 * the code should compile correctly. Instead, emit a warning. 1575 */ 1576 if (array->type->is_array() && 1577 array->type->element_type()->is_sampler() && 1578 const_index == NULL) { 1579 1580 if (state->language_version == 100) { 1581 _mesa_glsl_warning(&loc, state, 1582 "sampler arrays indexed with non-constant " 1583 "expressions is optional in GLSL ES 1.00"); 1584 } else if (state->language_version < 130) { 1585 _mesa_glsl_warning(&loc, state, 1586 "sampler arrays indexed with non-constant " 1587 "expressions is forbidden in GLSL 1.30 and " 1588 "later"); 1589 } else { 1590 _mesa_glsl_error(&loc, state, 1591 "sampler arrays indexed with non-constant " 1592 "expressions is forbidden in GLSL 1.30 and " 1593 "later"); 1594 error_emitted = true; 1595 } 1596 } 1597 1598 if (error_emitted) 1599 result->type = glsl_type::error_type; 1600 1601 break; 1602 } 1603 1604 case ast_function_call: 1605 /* Should *NEVER* get here. ast_function_call should always be handled 1606 * by ast_function_expression::hir. 1607 */ 1608 assert(0); 1609 break; 1610 1611 case ast_identifier: { 1612 /* ast_identifier can appear several places in a full abstract syntax 1613 * tree. This particular use must be at location specified in the grammar 1614 * as 'variable_identifier'. 1615 */ 1616 ir_variable *var = 1617 state->symbols->get_variable(this->primary_expression.identifier); 1618 1619 result = new(ctx) ir_dereference_variable(var); 1620 1621 if (var != NULL) { 1622 var->used = true; 1623 } else { 1624 _mesa_glsl_error(& loc, state, "`%s' undeclared", 1625 this->primary_expression.identifier); 1626 1627 error_emitted = true; 1628 } 1629 break; 1630 } 1631 1632 case ast_int_constant: 1633 result = new(ctx) ir_constant(this->primary_expression.int_constant); 1634 break; 1635 1636 case ast_uint_constant: 1637 result = new(ctx) ir_constant(this->primary_expression.uint_constant); 1638 break; 1639 1640 case ast_float_constant: 1641 result = new(ctx) ir_constant(this->primary_expression.float_constant); 1642 break; 1643 1644 case ast_bool_constant: 1645 result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant)); 1646 break; 1647 1648 case ast_sequence: { 1649 /* It should not be possible to generate a sequence in the AST without 1650 * any expressions in it. 1651 */ 1652 assert(!this->expressions.is_empty()); 1653 1654 /* The r-value of a sequence is the last expression in the sequence. If 1655 * the other expressions in the sequence do not have side-effects (and 1656 * therefore add instructions to the instruction list), they get dropped 1657 * on the floor. 1658 */ 1659 exec_node *previous_tail_pred = NULL; 1660 YYLTYPE previous_operand_loc = loc; 1661 1662 foreach_list_typed (ast_node, ast, link, &this->expressions) { 1663 /* If one of the operands of comma operator does not generate any 1664 * code, we want to emit a warning. At each pass through the loop 1665 * previous_tail_pred will point to the last instruction in the 1666 * stream *before* processing the previous operand. Naturally, 1667 * instructions->tail_pred will point to the last instruction in the 1668 * stream *after* processing the previous operand. If the two 1669 * pointers match, then the previous operand had no effect. 1670 * 1671 * The warning behavior here differs slightly from GCC. GCC will 1672 * only emit a warning if none of the left-hand operands have an 1673 * effect. However, it will emit a warning for each. I believe that 1674 * there are some cases in C (especially with GCC extensions) where 1675 * it is useful to have an intermediate step in a sequence have no 1676 * effect, but I don't think these cases exist in GLSL. Either way, 1677 * it would be a giant hassle to replicate that behavior. 1678 */ 1679 if (previous_tail_pred == instructions->tail_pred) { 1680 _mesa_glsl_warning(&previous_operand_loc, state, 1681 "left-hand operand of comma expression has " 1682 "no effect"); 1683 } 1684 1685 /* tail_pred is directly accessed instead of using the get_tail() 1686 * method for performance reasons. get_tail() has extra code to 1687 * return NULL when the list is empty. We don't care about that 1688 * here, so using tail_pred directly is fine. 1689 */ 1690 previous_tail_pred = instructions->tail_pred; 1691 previous_operand_loc = ast->get_location(); 1692 1693 result = ast->hir(instructions, state); 1694 } 1695 1696 /* Any errors should have already been emitted in the loop above. 1697 */ 1698 error_emitted = true; 1699 break; 1700 } 1701 } 1702 type = NULL; /* use result->type, not type. */ 1703 assert(result != NULL); 1704 1705 if (result->type->is_error() && !error_emitted) 1706 _mesa_glsl_error(& loc, state, "type mismatch"); 1707 1708 return result; 1709} 1710 1711 1712ir_rvalue * 1713ast_expression_statement::hir(exec_list *instructions, 1714 struct _mesa_glsl_parse_state *state) 1715{ 1716 /* It is possible to have expression statements that don't have an 1717 * expression. This is the solitary semicolon: 1718 * 1719 * for (i = 0; i < 5; i++) 1720 * ; 1721 * 1722 * In this case the expression will be NULL. Test for NULL and don't do 1723 * anything in that case. 1724 */ 1725 if (expression != NULL) 1726 expression->hir(instructions, state); 1727 1728 /* Statements do not have r-values. 1729 */ 1730 return NULL; 1731} 1732 1733 1734ir_rvalue * 1735ast_compound_statement::hir(exec_list *instructions, 1736 struct _mesa_glsl_parse_state *state) 1737{ 1738 if (new_scope) 1739 state->symbols->push_scope(); 1740 1741 foreach_list_typed (ast_node, ast, link, &this->statements) 1742 ast->hir(instructions, state); 1743 1744 if (new_scope) 1745 state->symbols->pop_scope(); 1746 1747 /* Compound statements do not have r-values. 1748 */ 1749 return NULL; 1750} 1751 1752 1753static const glsl_type * 1754process_array_type(YYLTYPE *loc, const glsl_type *base, ast_node *array_size, 1755 struct _mesa_glsl_parse_state *state) 1756{ 1757 unsigned length = 0; 1758 1759 /* FINISHME: Reject delcarations of multidimensional arrays. */ 1760 1761 if (array_size != NULL) { 1762 exec_list dummy_instructions; 1763 ir_rvalue *const ir = array_size->hir(& dummy_instructions, state); 1764 YYLTYPE loc = array_size->get_location(); 1765 1766 /* FINISHME: Verify that the grammar forbids side-effects in array 1767 * FINISHME: sizes. i.e., 'vec4 [x = 12] data' 1768 */ 1769 assert(dummy_instructions.is_empty()); 1770 1771 if (ir != NULL) { 1772 if (!ir->type->is_integer()) { 1773 _mesa_glsl_error(& loc, state, "array size must be integer type"); 1774 } else if (!ir->type->is_scalar()) { 1775 _mesa_glsl_error(& loc, state, "array size must be scalar type"); 1776 } else { 1777 ir_constant *const size = ir->constant_expression_value(); 1778 1779 if (size == NULL) { 1780 _mesa_glsl_error(& loc, state, "array size must be a " 1781 "constant valued expression"); 1782 } else if (size->value.i[0] <= 0) { 1783 _mesa_glsl_error(& loc, state, "array size must be > 0"); 1784 } else { 1785 assert(size->type == ir->type); 1786 length = size->value.u[0]; 1787 } 1788 } 1789 } 1790 } else if (state->es_shader) { 1791 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized 1792 * array declarations have been removed from the language. 1793 */ 1794 _mesa_glsl_error(loc, state, "unsized array declarations are not " 1795 "allowed in GLSL ES 1.00."); 1796 } 1797 1798 return glsl_type::get_array_instance(base, length); 1799} 1800 1801 1802const glsl_type * 1803ast_type_specifier::glsl_type(const char **name, 1804 struct _mesa_glsl_parse_state *state) const 1805{ 1806 const struct glsl_type *type; 1807 1808 type = state->symbols->get_type(this->type_name); 1809 *name = this->type_name; 1810 1811 if (this->is_array) { 1812 YYLTYPE loc = this->get_location(); 1813 type = process_array_type(&loc, type, this->array_size, state); 1814 } 1815 1816 return type; 1817} 1818 1819 1820static void 1821apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual, 1822 ir_variable *var, 1823 struct _mesa_glsl_parse_state *state, 1824 YYLTYPE *loc) 1825{ 1826 if (qual->flags.q.invariant) { 1827 if (var->used) { 1828 _mesa_glsl_error(loc, state, 1829 "variable `%s' may not be redeclared " 1830 "`invariant' after being used", 1831 var->name); 1832 } else { 1833 var->invariant = 1; 1834 } 1835 } 1836 1837 if (qual->flags.q.constant || qual->flags.q.attribute 1838 || qual->flags.q.uniform 1839 || (qual->flags.q.varying && (state->target == fragment_shader))) 1840 var->read_only = 1; 1841 1842 if (qual->flags.q.centroid) 1843 var->centroid = 1; 1844 1845 if (qual->flags.q.attribute && state->target != vertex_shader) { 1846 var->type = glsl_type::error_type; 1847 _mesa_glsl_error(loc, state, 1848 "`attribute' variables may not be declared in the " 1849 "%s shader", 1850 _mesa_glsl_shader_target_name(state->target)); 1851 } 1852 1853 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec: 1854 * 1855 * "The varying qualifier can be used only with the data types 1856 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of 1857 * these." 1858 */ 1859 if (qual->flags.q.varying) { 1860 const glsl_type *non_array_type; 1861 1862 if (var->type && var->type->is_array()) 1863 non_array_type = var->type->fields.array; 1864 else 1865 non_array_type = var->type; 1866 1867 if (non_array_type && non_array_type->base_type != GLSL_TYPE_FLOAT) { 1868 var->type = glsl_type::error_type; 1869 _mesa_glsl_error(loc, state, 1870 "varying variables must be of base type float"); 1871 } 1872 } 1873 1874 /* If there is no qualifier that changes the mode of the variable, leave 1875 * the setting alone. 1876 */ 1877 if (qual->flags.q.in && qual->flags.q.out) 1878 var->mode = ir_var_inout; 1879 else if (qual->flags.q.attribute || qual->flags.q.in 1880 || (qual->flags.q.varying && (state->target == fragment_shader))) 1881 var->mode = ir_var_in; 1882 else if (qual->flags.q.out 1883 || (qual->flags.q.varying && (state->target == vertex_shader))) 1884 var->mode = ir_var_out; 1885 else if (qual->flags.q.uniform) 1886 var->mode = ir_var_uniform; 1887 1888 if (state->all_invariant && (state->current_function == NULL)) { 1889 switch (state->target) { 1890 case vertex_shader: 1891 if (var->mode == ir_var_out) 1892 var->invariant = true; 1893 break; 1894 case geometry_shader: 1895 if ((var->mode == ir_var_in) || (var->mode == ir_var_out)) 1896 var->invariant = true; 1897 break; 1898 case fragment_shader: 1899 if (var->mode == ir_var_in) 1900 var->invariant = true; 1901 break; 1902 } 1903 } 1904 1905 if (qual->flags.q.flat) 1906 var->interpolation = ir_var_flat; 1907 else if (qual->flags.q.noperspective) 1908 var->interpolation = ir_var_noperspective; 1909 else 1910 var->interpolation = ir_var_smooth; 1911 1912 var->pixel_center_integer = qual->flags.q.pixel_center_integer; 1913 var->origin_upper_left = qual->flags.q.origin_upper_left; 1914 if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer) 1915 && (strcmp(var->name, "gl_FragCoord") != 0)) { 1916 const char *const qual_string = (qual->flags.q.origin_upper_left) 1917 ? "origin_upper_left" : "pixel_center_integer"; 1918 1919 _mesa_glsl_error(loc, state, 1920 "layout qualifier `%s' can only be applied to " 1921 "fragment shader input `gl_FragCoord'", 1922 qual_string); 1923 } 1924 1925 if (qual->flags.q.explicit_location) { 1926 const bool global_scope = (state->current_function == NULL); 1927 bool fail = false; 1928 const char *string = ""; 1929 1930 /* In the vertex shader only shader inputs can be given explicit 1931 * locations. 1932 * 1933 * In the fragment shader only shader outputs can be given explicit 1934 * locations. 1935 */ 1936 switch (state->target) { 1937 case vertex_shader: 1938 if (!global_scope || (var->mode != ir_var_in)) { 1939 fail = true; 1940 string = "input"; 1941 } 1942 break; 1943 1944 case geometry_shader: 1945 _mesa_glsl_error(loc, state, 1946 "geometry shader variables cannot be given " 1947 "explicit locations\n"); 1948 break; 1949 1950 case fragment_shader: 1951 if (!global_scope || (var->mode != ir_var_out)) { 1952 fail = true; 1953 string = "output"; 1954 } 1955 break; 1956 }; 1957 1958 if (fail) { 1959 _mesa_glsl_error(loc, state, 1960 "only %s shader %s variables can be given an " 1961 "explicit location\n", 1962 _mesa_glsl_shader_target_name(state->target), 1963 string); 1964 } else { 1965 var->explicit_location = true; 1966 1967 /* This bit of silliness is needed because invalid explicit locations 1968 * are supposed to be flagged during linking. Small negative values 1969 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias 1970 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS). 1971 * The linker needs to be able to differentiate these cases. This 1972 * ensures that negative values stay negative. 1973 */ 1974 if (qual->location >= 0) { 1975 var->location = (state->target == vertex_shader) 1976 ? (qual->location + VERT_ATTRIB_GENERIC0) 1977 : (qual->location + FRAG_RESULT_DATA0); 1978 } else { 1979 var->location = qual->location; 1980 } 1981 } 1982 } 1983 1984 /* Does the declaration use the 'layout' keyword? 1985 */ 1986 const bool uses_layout = qual->flags.q.pixel_center_integer 1987 || qual->flags.q.origin_upper_left 1988 || qual->flags.q.explicit_location; 1989 1990 /* Does the declaration use the deprecated 'attribute' or 'varying' 1991 * keywords? 1992 */ 1993 const bool uses_deprecated_qualifier = qual->flags.q.attribute 1994 || qual->flags.q.varying; 1995 1996 /* Is the 'layout' keyword used with parameters that allow relaxed checking. 1997 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some 1998 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable 1999 * allowed the layout qualifier to be used with 'varying' and 'attribute'. 2000 * These extensions and all following extensions that add the 'layout' 2001 * keyword have been modified to require the use of 'in' or 'out'. 2002 * 2003 * The following extension do not allow the deprecated keywords: 2004 * 2005 * GL_AMD_conservative_depth 2006 * GL_ARB_gpu_shader5 2007 * GL_ARB_separate_shader_objects 2008 * GL_ARB_tesselation_shader 2009 * GL_ARB_transform_feedback3 2010 * GL_ARB_uniform_buffer_object 2011 * 2012 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5 2013 * allow layout with the deprecated keywords. 2014 */ 2015 const bool relaxed_layout_qualifier_checking = 2016 state->ARB_fragment_coord_conventions_enable; 2017 2018 if (uses_layout && uses_deprecated_qualifier) { 2019 if (relaxed_layout_qualifier_checking) { 2020 _mesa_glsl_warning(loc, state, 2021 "`layout' qualifier may not be used with " 2022 "`attribute' or `varying'"); 2023 } else { 2024 _mesa_glsl_error(loc, state, 2025 "`layout' qualifier may not be used with " 2026 "`attribute' or `varying'"); 2027 } 2028 } 2029 2030 /* Layout qualifiers for gl_FragDepth, which are enabled by extension 2031 * AMD_conservative_depth. 2032 */ 2033 int depth_layout_count = qual->flags.q.depth_any 2034 + qual->flags.q.depth_greater 2035 + qual->flags.q.depth_less 2036 + qual->flags.q.depth_unchanged; 2037 if (depth_layout_count > 0 2038 && !state->AMD_conservative_depth_enable) { 2039 _mesa_glsl_error(loc, state, 2040 "extension GL_AMD_conservative_depth must be enabled " 2041 "to use depth layout qualifiers"); 2042 } else if (depth_layout_count > 0 2043 && strcmp(var->name, "gl_FragDepth") != 0) { 2044 _mesa_glsl_error(loc, state, 2045 "depth layout qualifiers can be applied only to " 2046 "gl_FragDepth"); 2047 } else if (depth_layout_count > 1 2048 && strcmp(var->name, "gl_FragDepth") == 0) { 2049 _mesa_glsl_error(loc, state, 2050 "at most one depth layout qualifier can be applied to " 2051 "gl_FragDepth"); 2052 } 2053 if (qual->flags.q.depth_any) 2054 var->depth_layout = ir_depth_layout_any; 2055 else if (qual->flags.q.depth_greater) 2056 var->depth_layout = ir_depth_layout_greater; 2057 else if (qual->flags.q.depth_less) 2058 var->depth_layout = ir_depth_layout_less; 2059 else if (qual->flags.q.depth_unchanged) 2060 var->depth_layout = ir_depth_layout_unchanged; 2061 else 2062 var->depth_layout = ir_depth_layout_none; 2063 2064 if (var->type->is_array() && state->language_version != 110) { 2065 var->array_lvalue = true; 2066 } 2067} 2068 2069/** 2070 * Get the variable that is being redeclared by this declaration 2071 * 2072 * Semantic checks to verify the validity of the redeclaration are also 2073 * performed. If semantic checks fail, compilation error will be emitted via 2074 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned. 2075 * 2076 * \returns 2077 * A pointer to an existing variable in the current scope if the declaration 2078 * is a redeclaration, \c NULL otherwise. 2079 */ 2080ir_variable * 2081get_variable_being_redeclared(ir_variable *var, ast_declaration *decl, 2082 struct _mesa_glsl_parse_state *state) 2083{ 2084 /* Check if this declaration is actually a re-declaration, either to 2085 * resize an array or add qualifiers to an existing variable. 2086 * 2087 * This is allowed for variables in the current scope, or when at 2088 * global scope (for built-ins in the implicit outer scope). 2089 */ 2090 ir_variable *earlier = state->symbols->get_variable(decl->identifier); 2091 if (earlier == NULL || 2092 (state->current_function != NULL && 2093 !state->symbols->name_declared_this_scope(decl->identifier))) { 2094 return NULL; 2095 } 2096 2097 2098 YYLTYPE loc = decl->get_location(); 2099 2100 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec, 2101 * 2102 * "It is legal to declare an array without a size and then 2103 * later re-declare the same name as an array of the same 2104 * type and specify a size." 2105 */ 2106 if ((earlier->type->array_size() == 0) 2107 && var->type->is_array() 2108 && (var->type->element_type() == earlier->type->element_type())) { 2109 /* FINISHME: This doesn't match the qualifiers on the two 2110 * FINISHME: declarations. It's not 100% clear whether this is 2111 * FINISHME: required or not. 2112 */ 2113 2114 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec: 2115 * 2116 * "The size [of gl_TexCoord] can be at most 2117 * gl_MaxTextureCoords." 2118 */ 2119 const unsigned size = unsigned(var->type->array_size()); 2120 if ((strcmp("gl_TexCoord", var->name) == 0) 2121 && (size > state->Const.MaxTextureCoords)) { 2122 _mesa_glsl_error(& loc, state, "`gl_TexCoord' array size cannot " 2123 "be larger than gl_MaxTextureCoords (%u)\n", 2124 state->Const.MaxTextureCoords); 2125 } else if ((size > 0) && (size <= earlier->max_array_access)) { 2126 _mesa_glsl_error(& loc, state, "array size must be > %u due to " 2127 "previous access", 2128 earlier->max_array_access); 2129 } 2130 2131 earlier->type = var->type; 2132 delete var; 2133 var = NULL; 2134 } else if (state->ARB_fragment_coord_conventions_enable 2135 && strcmp(var->name, "gl_FragCoord") == 0 2136 && earlier->type == var->type 2137 && earlier->mode == var->mode) { 2138 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout 2139 * qualifiers. 2140 */ 2141 earlier->origin_upper_left = var->origin_upper_left; 2142 earlier->pixel_center_integer = var->pixel_center_integer; 2143 2144 /* According to section 4.3.7 of the GLSL 1.30 spec, 2145 * the following built-in varaibles can be redeclared with an 2146 * interpolation qualifier: 2147 * * gl_FrontColor 2148 * * gl_BackColor 2149 * * gl_FrontSecondaryColor 2150 * * gl_BackSecondaryColor 2151 * * gl_Color 2152 * * gl_SecondaryColor 2153 */ 2154 } else if (state->language_version >= 130 2155 && (strcmp(var->name, "gl_FrontColor") == 0 2156 || strcmp(var->name, "gl_BackColor") == 0 2157 || strcmp(var->name, "gl_FrontSecondaryColor") == 0 2158 || strcmp(var->name, "gl_BackSecondaryColor") == 0 2159 || strcmp(var->name, "gl_Color") == 0 2160 || strcmp(var->name, "gl_SecondaryColor") == 0) 2161 && earlier->type == var->type 2162 && earlier->mode == var->mode) { 2163 earlier->interpolation = var->interpolation; 2164 2165 /* Layout qualifiers for gl_FragDepth. */ 2166 } else if (state->AMD_conservative_depth_enable 2167 && strcmp(var->name, "gl_FragDepth") == 0 2168 && earlier->type == var->type 2169 && earlier->mode == var->mode) { 2170 2171 /** From the AMD_conservative_depth spec: 2172 * Within any shader, the first redeclarations of gl_FragDepth 2173 * must appear before any use of gl_FragDepth. 2174 */ 2175 if (earlier->used) { 2176 _mesa_glsl_error(&loc, state, 2177 "the first redeclaration of gl_FragDepth " 2178 "must appear before any use of gl_FragDepth"); 2179 } 2180 2181 /* Prevent inconsistent redeclaration of depth layout qualifier. */ 2182 if (earlier->depth_layout != ir_depth_layout_none 2183 && earlier->depth_layout != var->depth_layout) { 2184 _mesa_glsl_error(&loc, state, 2185 "gl_FragDepth: depth layout is declared here " 2186 "as '%s, but it was previously declared as " 2187 "'%s'", 2188 depth_layout_string(var->depth_layout), 2189 depth_layout_string(earlier->depth_layout)); 2190 } 2191 2192 earlier->depth_layout = var->depth_layout; 2193 2194 } else { 2195 _mesa_glsl_error(&loc, state, "`%s' redeclared", decl->identifier); 2196 } 2197 2198 return earlier; 2199} 2200 2201/** 2202 * Generate the IR for an initializer in a variable declaration 2203 */ 2204ir_rvalue * 2205process_initializer(ir_variable *var, ast_declaration *decl, 2206 ast_fully_specified_type *type, 2207 exec_list *initializer_instructions, 2208 struct _mesa_glsl_parse_state *state) 2209{ 2210 ir_rvalue *result = NULL; 2211 2212 YYLTYPE initializer_loc = decl->initializer->get_location(); 2213 2214 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec: 2215 * 2216 * "All uniform variables are read-only and are initialized either 2217 * directly by an application via API commands, or indirectly by 2218 * OpenGL." 2219 */ 2220 if ((state->language_version <= 110) 2221 && (var->mode == ir_var_uniform)) { 2222 _mesa_glsl_error(& initializer_loc, state, 2223 "cannot initialize uniforms in GLSL 1.10"); 2224 } 2225 2226 if (var->type->is_sampler()) { 2227 _mesa_glsl_error(& initializer_loc, state, 2228 "cannot initialize samplers"); 2229 } 2230 2231 if ((var->mode == ir_var_in) && (state->current_function == NULL)) { 2232 _mesa_glsl_error(& initializer_loc, state, 2233 "cannot initialize %s shader input / %s", 2234 _mesa_glsl_shader_target_name(state->target), 2235 (state->target == vertex_shader) 2236 ? "attribute" : "varying"); 2237 } 2238 2239 ir_dereference *const lhs = new(state) ir_dereference_variable(var); 2240 ir_rvalue *rhs = decl->initializer->hir(initializer_instructions, 2241 state); 2242 2243 /* Calculate the constant value if this is a const or uniform 2244 * declaration. 2245 */ 2246 if (type->qualifier.flags.q.constant 2247 || type->qualifier.flags.q.uniform) { 2248 ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs, true); 2249 if (new_rhs != NULL) { 2250 rhs = new_rhs; 2251 2252 ir_constant *constant_value = rhs->constant_expression_value(); 2253 if (!constant_value) { 2254 _mesa_glsl_error(& initializer_loc, state, 2255 "initializer of %s variable `%s' must be a " 2256 "constant expression", 2257 (type->qualifier.flags.q.constant) 2258 ? "const" : "uniform", 2259 decl->identifier); 2260 if (var->type->is_numeric()) { 2261 /* Reduce cascading errors. */ 2262 var->constant_value = ir_constant::zero(state, var->type); 2263 } 2264 } else { 2265 rhs = constant_value; 2266 var->constant_value = constant_value; 2267 } 2268 } else { 2269 _mesa_glsl_error(&initializer_loc, state, 2270 "initializer of type %s cannot be assigned to " 2271 "variable of type %s", 2272 rhs->type->name, var->type->name); 2273 if (var->type->is_numeric()) { 2274 /* Reduce cascading errors. */ 2275 var->constant_value = ir_constant::zero(state, var->type); 2276 } 2277 } 2278 } 2279 2280 if (rhs && !rhs->type->is_error()) { 2281 bool temp = var->read_only; 2282 if (type->qualifier.flags.q.constant) 2283 var->read_only = false; 2284 2285 /* Never emit code to initialize a uniform. 2286 */ 2287 const glsl_type *initializer_type; 2288 if (!type->qualifier.flags.q.uniform) { 2289 result = do_assignment(initializer_instructions, state, 2290 lhs, rhs, true, 2291 type->get_location()); 2292 initializer_type = result->type; 2293 } else 2294 initializer_type = rhs->type; 2295 2296 /* If the declared variable is an unsized array, it must inherrit 2297 * its full type from the initializer. A declaration such as 2298 * 2299 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0); 2300 * 2301 * becomes 2302 * 2303 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0); 2304 * 2305 * The assignment generated in the if-statement (below) will also 2306 * automatically handle this case for non-uniforms. 2307 * 2308 * If the declared variable is not an array, the types must 2309 * already match exactly. As a result, the type assignment 2310 * here can be done unconditionally. For non-uniforms the call 2311 * to do_assignment can change the type of the initializer (via 2312 * the implicit conversion rules). For uniforms the initializer 2313 * must be a constant expression, and the type of that expression 2314 * was validated above. 2315 */ 2316 var->type = initializer_type; 2317 2318 var->read_only = temp; 2319 } 2320 2321 return result; 2322} 2323 2324ir_rvalue * 2325ast_declarator_list::hir(exec_list *instructions, 2326 struct _mesa_glsl_parse_state *state) 2327{ 2328 void *ctx = state; 2329 const struct glsl_type *decl_type; 2330 const char *type_name = NULL; 2331 ir_rvalue *result = NULL; 2332 YYLTYPE loc = this->get_location(); 2333 2334 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec: 2335 * 2336 * "To ensure that a particular output variable is invariant, it is 2337 * necessary to use the invariant qualifier. It can either be used to 2338 * qualify a previously declared variable as being invariant 2339 * 2340 * invariant gl_Position; // make existing gl_Position be invariant" 2341 * 2342 * In these cases the parser will set the 'invariant' flag in the declarator 2343 * list, and the type will be NULL. 2344 */ 2345 if (this->invariant) { 2346 assert(this->type == NULL); 2347 2348 if (state->current_function != NULL) { 2349 _mesa_glsl_error(& loc, state, 2350 "All uses of `invariant' keyword must be at global " 2351 "scope\n"); 2352 } 2353 2354 foreach_list_typed (ast_declaration, decl, link, &this->declarations) { 2355 assert(!decl->is_array); 2356 assert(decl->array_size == NULL); 2357 assert(decl->initializer == NULL); 2358 2359 ir_variable *const earlier = 2360 state->symbols->get_variable(decl->identifier); 2361 if (earlier == NULL) { 2362 _mesa_glsl_error(& loc, state, 2363 "Undeclared variable `%s' cannot be marked " 2364 "invariant\n", decl->identifier); 2365 } else if ((state->target == vertex_shader) 2366 && (earlier->mode != ir_var_out)) { 2367 _mesa_glsl_error(& loc, state, 2368 "`%s' cannot be marked invariant, vertex shader " 2369 "outputs only\n", decl->identifier); 2370 } else if ((state->target == fragment_shader) 2371 && (earlier->mode != ir_var_in)) { 2372 _mesa_glsl_error(& loc, state, 2373 "`%s' cannot be marked invariant, fragment shader " 2374 "inputs only\n", decl->identifier); 2375 } else if (earlier->used) { 2376 _mesa_glsl_error(& loc, state, 2377 "variable `%s' may not be redeclared " 2378 "`invariant' after being used", 2379 earlier->name); 2380 } else { 2381 earlier->invariant = true; 2382 } 2383 } 2384 2385 /* Invariant redeclarations do not have r-values. 2386 */ 2387 return NULL; 2388 } 2389 2390 assert(this->type != NULL); 2391 assert(!this->invariant); 2392 2393 /* The type specifier may contain a structure definition. Process that 2394 * before any of the variable declarations. 2395 */ 2396 (void) this->type->specifier->hir(instructions, state); 2397 2398 decl_type = this->type->specifier->glsl_type(& type_name, state); 2399 if (this->declarations.is_empty()) { 2400 /* The only valid case where the declaration list can be empty is when 2401 * the declaration is setting the default precision of a built-in type 2402 * (e.g., 'precision highp vec4;'). 2403 */ 2404 2405 if (decl_type != NULL) { 2406 } else { 2407 _mesa_glsl_error(& loc, state, "incomplete declaration"); 2408 } 2409 } 2410 2411 foreach_list_typed (ast_declaration, decl, link, &this->declarations) { 2412 const struct glsl_type *var_type; 2413 ir_variable *var; 2414 2415 /* FINISHME: Emit a warning if a variable declaration shadows a 2416 * FINISHME: declaration at a higher scope. 2417 */ 2418 2419 if ((decl_type == NULL) || decl_type->is_void()) { 2420 if (type_name != NULL) { 2421 _mesa_glsl_error(& loc, state, 2422 "invalid type `%s' in declaration of `%s'", 2423 type_name, decl->identifier); 2424 } else { 2425 _mesa_glsl_error(& loc, state, 2426 "invalid type in declaration of `%s'", 2427 decl->identifier); 2428 } 2429 continue; 2430 } 2431 2432 if (decl->is_array) { 2433 var_type = process_array_type(&loc, decl_type, decl->array_size, 2434 state); 2435 } else { 2436 var_type = decl_type; 2437 } 2438 2439 var = new(ctx) ir_variable(var_type, decl->identifier, ir_var_auto); 2440 2441 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification; 2442 * 2443 * "Global variables can only use the qualifiers const, 2444 * attribute, uni form, or varying. Only one may be 2445 * specified. 2446 * 2447 * Local variables can only use the qualifier const." 2448 * 2449 * This is relaxed in GLSL 1.30. It is also relaxed by any extension 2450 * that adds the 'layout' keyword. 2451 */ 2452 if ((state->language_version < 130) 2453 && !state->ARB_explicit_attrib_location_enable 2454 && !state->ARB_fragment_coord_conventions_enable) { 2455 if (this->type->qualifier.flags.q.out) { 2456 _mesa_glsl_error(& loc, state, 2457 "`out' qualifier in declaration of `%s' " 2458 "only valid for function parameters in %s.", 2459 decl->identifier, state->version_string); 2460 } 2461 if (this->type->qualifier.flags.q.in) { 2462 _mesa_glsl_error(& loc, state, 2463 "`in' qualifier in declaration of `%s' " 2464 "only valid for function parameters in %s.", 2465 decl->identifier, state->version_string); 2466 } 2467 /* FINISHME: Test for other invalid qualifiers. */ 2468 } 2469 2470 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, 2471 & loc); 2472 2473 if (this->type->qualifier.flags.q.invariant) { 2474 if ((state->target == vertex_shader) && !(var->mode == ir_var_out || 2475 var->mode == ir_var_inout)) { 2476 /* FINISHME: Note that this doesn't work for invariant on 2477 * a function signature outval 2478 */ 2479 _mesa_glsl_error(& loc, state, 2480 "`%s' cannot be marked invariant, vertex shader " 2481 "outputs only\n", var->name); 2482 } else if ((state->target == fragment_shader) && 2483 !(var->mode == ir_var_in || var->mode == ir_var_inout)) { 2484 /* FINISHME: Note that this doesn't work for invariant on 2485 * a function signature inval 2486 */ 2487 _mesa_glsl_error(& loc, state, 2488 "`%s' cannot be marked invariant, fragment shader " 2489 "inputs only\n", var->name); 2490 } 2491 } 2492 2493 if (state->current_function != NULL) { 2494 const char *mode = NULL; 2495 const char *extra = ""; 2496 2497 /* There is no need to check for 'inout' here because the parser will 2498 * only allow that in function parameter lists. 2499 */ 2500 if (this->type->qualifier.flags.q.attribute) { 2501 mode = "attribute"; 2502 } else if (this->type->qualifier.flags.q.uniform) { 2503 mode = "uniform"; 2504 } else if (this->type->qualifier.flags.q.varying) { 2505 mode = "varying"; 2506 } else if (this->type->qualifier.flags.q.in) { 2507 mode = "in"; 2508 extra = " or in function parameter list"; 2509 } else if (this->type->qualifier.flags.q.out) { 2510 mode = "out"; 2511 extra = " or in function parameter list"; 2512 } 2513 2514 if (mode) { 2515 _mesa_glsl_error(& loc, state, 2516 "%s variable `%s' must be declared at " 2517 "global scope%s", 2518 mode, var->name, extra); 2519 } 2520 } else if (var->mode == ir_var_in) { 2521 var->read_only = true; 2522 2523 if (state->target == vertex_shader) { 2524 bool error_emitted = false; 2525 2526 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec: 2527 * 2528 * "Vertex shader inputs can only be float, floating-point 2529 * vectors, matrices, signed and unsigned integers and integer 2530 * vectors. Vertex shader inputs can also form arrays of these 2531 * types, but not structures." 2532 * 2533 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec: 2534 * 2535 * "Vertex shader inputs can only be float, floating-point 2536 * vectors, matrices, signed and unsigned integers and integer 2537 * vectors. They cannot be arrays or structures." 2538 * 2539 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec: 2540 * 2541 * "The attribute qualifier can be used only with float, 2542 * floating-point vectors, and matrices. Attribute variables 2543 * cannot be declared as arrays or structures." 2544 */ 2545 const glsl_type *check_type = var->type->is_array() 2546 ? var->type->fields.array : var->type; 2547 2548 switch (check_type->base_type) { 2549 case GLSL_TYPE_FLOAT: 2550 break; 2551 case GLSL_TYPE_UINT: 2552 case GLSL_TYPE_INT: 2553 if (state->language_version > 120) 2554 break; 2555 /* FALLTHROUGH */ 2556 default: 2557 _mesa_glsl_error(& loc, state, 2558 "vertex shader input / attribute cannot have " 2559 "type %s`%s'", 2560 var->type->is_array() ? "array of " : "", 2561 check_type->name); 2562 error_emitted = true; 2563 } 2564 2565 if (!error_emitted && (state->language_version <= 130) 2566 && var->type->is_array()) { 2567 _mesa_glsl_error(& loc, state, 2568 "vertex shader input / attribute cannot have " 2569 "array type"); 2570 error_emitted = true; 2571 } 2572 } 2573 } 2574 2575 /* Integer vertex outputs must be qualified with 'flat'. 2576 * 2577 * From section 4.3.6 of the GLSL 1.30 spec: 2578 * "If a vertex output is a signed or unsigned integer or integer 2579 * vector, then it must be qualified with the interpolation qualifier 2580 * flat." 2581 */ 2582 if (state->language_version >= 130 2583 && state->target == vertex_shader 2584 && state->current_function == NULL 2585 && var->type->is_integer() 2586 && var->mode == ir_var_out 2587 && var->interpolation != ir_var_flat) { 2588 2589 _mesa_glsl_error(&loc, state, "If a vertex output is an integer, " 2590 "then it must be qualified with 'flat'"); 2591 } 2592 2593 2594 /* Interpolation qualifiers cannot be applied to 'centroid' and 2595 * 'centroid varying'. 2596 * 2597 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec: 2598 * "interpolation qualifiers may only precede the qualifiers in, 2599 * centroid in, out, or centroid out in a declaration. They do not apply 2600 * to the deprecated storage qualifiers varying or centroid varying." 2601 */ 2602 if (state->language_version >= 130 2603 && this->type->qualifier.has_interpolation() 2604 && this->type->qualifier.flags.q.varying) { 2605 2606 const char *i = this->type->qualifier.interpolation_string(); 2607 assert(i != NULL); 2608 const char *s; 2609 if (this->type->qualifier.flags.q.centroid) 2610 s = "centroid varying"; 2611 else 2612 s = "varying"; 2613 2614 _mesa_glsl_error(&loc, state, 2615 "qualifier '%s' cannot be applied to the " 2616 "deprecated storage qualifier '%s'", i, s); 2617 } 2618 2619 2620 /* Interpolation qualifiers can only apply to vertex shader outputs and 2621 * fragment shader inputs. 2622 * 2623 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec: 2624 * "Outputs from a vertex shader (out) and inputs to a fragment 2625 * shader (in) can be further qualified with one or more of these 2626 * interpolation qualifiers" 2627 */ 2628 if (state->language_version >= 130 2629 && this->type->qualifier.has_interpolation()) { 2630 2631 const char *i = this->type->qualifier.interpolation_string(); 2632 assert(i != NULL); 2633 2634 switch (state->target) { 2635 case vertex_shader: 2636 if (this->type->qualifier.flags.q.in) { 2637 _mesa_glsl_error(&loc, state, 2638 "qualifier '%s' cannot be applied to vertex " 2639 "shader inputs", i); 2640 } 2641 break; 2642 case fragment_shader: 2643 if (this->type->qualifier.flags.q.out) { 2644 _mesa_glsl_error(&loc, state, 2645 "qualifier '%s' cannot be applied to fragment " 2646 "shader outputs", i); 2647 } 2648 break; 2649 default: 2650 assert(0); 2651 } 2652 } 2653 2654 2655 /* From section 4.3.4 of the GLSL 1.30 spec: 2656 * "It is an error to use centroid in in a vertex shader." 2657 */ 2658 if (state->language_version >= 130 2659 && this->type->qualifier.flags.q.centroid 2660 && this->type->qualifier.flags.q.in 2661 && state->target == vertex_shader) { 2662 2663 _mesa_glsl_error(&loc, state, 2664 "'centroid in' cannot be used in a vertex shader"); 2665 } 2666 2667 2668 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30. 2669 */ 2670 if (this->type->specifier->precision != ast_precision_none 2671 && state->language_version != 100 2672 && state->language_version < 130) { 2673 2674 _mesa_glsl_error(&loc, state, 2675 "precision qualifiers are supported only in GLSL ES " 2676 "1.00, and GLSL 1.30 and later"); 2677 } 2678 2679 2680 /* Precision qualifiers only apply to floating point and integer types. 2681 * 2682 * From section 4.5.2 of the GLSL 1.30 spec: 2683 * "Any floating point or any integer declaration can have the type 2684 * preceded by one of these precision qualifiers [...] Literal 2685 * constants do not have precision qualifiers. Neither do Boolean 2686 * variables. 2687 * 2688 * In GLSL ES, sampler types are also allowed. 2689 * 2690 * From page 87 of the GLSL ES spec: 2691 * "RESOLUTION: Allow sampler types to take a precision qualifier." 2692 */ 2693 if (this->type->specifier->precision != ast_precision_none 2694 && !var->type->is_float() 2695 && !var->type->is_integer() 2696 && !(var->type->is_sampler() && state->es_shader) 2697 && !(var->type->is_array() 2698 && (var->type->fields.array->is_float() 2699 || var->type->fields.array->is_integer()))) { 2700 2701 _mesa_glsl_error(&loc, state, 2702 "precision qualifiers apply only to floating point" 2703 "%s types", state->es_shader ? ", integer, and sampler" 2704 : "and integer"); 2705 } 2706 2707 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec: 2708 * 2709 * "[Sampler types] can only be declared as function 2710 * parameters or uniform variables (see Section 4.3.5 2711 * "Uniform")". 2712 */ 2713 if (var_type->contains_sampler() && 2714 !this->type->qualifier.flags.q.uniform) { 2715 _mesa_glsl_error(&loc, state, "samplers must be declared uniform"); 2716 } 2717 2718 /* Process the initializer and add its instructions to a temporary 2719 * list. This list will be added to the instruction stream (below) after 2720 * the declaration is added. This is done because in some cases (such as 2721 * redeclarations) the declaration may not actually be added to the 2722 * instruction stream. 2723 */ 2724 exec_list initializer_instructions; 2725 ir_variable *earlier = get_variable_being_redeclared(var, decl, state); 2726 2727 if (decl->initializer != NULL) { 2728 result = process_initializer((earlier == NULL) ? var : earlier, 2729 decl, this->type, 2730 &initializer_instructions, state); 2731 } 2732 2733 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec: 2734 * 2735 * "It is an error to write to a const variable outside of 2736 * its declaration, so they must be initialized when 2737 * declared." 2738 */ 2739 if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) { 2740 _mesa_glsl_error(& loc, state, 2741 "const declaration of `%s' must be initialized", 2742 decl->identifier); 2743 } 2744 2745 /* If the declaration is not a redeclaration, there are a few additional 2746 * semantic checks that must be applied. In addition, variable that was 2747 * created for the declaration should be added to the IR stream. 2748 */ 2749 if (earlier == NULL) { 2750 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec, 2751 * 2752 * "Identifiers starting with "gl_" are reserved for use by 2753 * OpenGL, and may not be declared in a shader as either a 2754 * variable or a function." 2755 */ 2756 if (strncmp(decl->identifier, "gl_", 3) == 0) 2757 _mesa_glsl_error(& loc, state, 2758 "identifier `%s' uses reserved `gl_' prefix", 2759 decl->identifier); 2760 2761 /* Add the variable to the symbol table. Note that the initializer's 2762 * IR was already processed earlier (though it hasn't been emitted 2763 * yet), without the variable in scope. 2764 * 2765 * This differs from most C-like languages, but it follows the GLSL 2766 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50 2767 * spec: 2768 * 2769 * "Within a declaration, the scope of a name starts immediately 2770 * after the initializer if present or immediately after the name 2771 * being declared if not." 2772 */ 2773 if (!state->symbols->add_variable(var)) { 2774 YYLTYPE loc = this->get_location(); 2775 _mesa_glsl_error(&loc, state, "name `%s' already taken in the " 2776 "current scope", decl->identifier); 2777 continue; 2778 } 2779 2780 /* Push the variable declaration to the top. It means that all the 2781 * variable declarations will appear in a funny last-to-first order, 2782 * but otherwise we run into trouble if a function is prototyped, a 2783 * global var is decled, then the function is defined with usage of 2784 * the global var. See glslparsertest's CorrectModule.frag. 2785 */ 2786 instructions->push_head(var); 2787 } 2788 2789 instructions->append_list(&initializer_instructions); 2790 } 2791 2792 2793 /* Generally, variable declarations do not have r-values. However, 2794 * one is used for the declaration in 2795 * 2796 * while (bool b = some_condition()) { 2797 * ... 2798 * } 2799 * 2800 * so we return the rvalue from the last seen declaration here. 2801 */ 2802 return result; 2803} 2804 2805 2806ir_rvalue * 2807ast_parameter_declarator::hir(exec_list *instructions, 2808 struct _mesa_glsl_parse_state *state) 2809{ 2810 void *ctx = state; 2811 const struct glsl_type *type; 2812 const char *name = NULL; 2813 YYLTYPE loc = this->get_location(); 2814 2815 type = this->type->specifier->glsl_type(& name, state); 2816 2817 if (type == NULL) { 2818 if (name != NULL) { 2819 _mesa_glsl_error(& loc, state, 2820 "invalid type `%s' in declaration of `%s'", 2821 name, this->identifier); 2822 } else { 2823 _mesa_glsl_error(& loc, state, 2824 "invalid type in declaration of `%s'", 2825 this->identifier); 2826 } 2827 2828 type = glsl_type::error_type; 2829 } 2830 2831 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec: 2832 * 2833 * "Functions that accept no input arguments need not use void in the 2834 * argument list because prototypes (or definitions) are required and 2835 * therefore there is no ambiguity when an empty argument list "( )" is 2836 * declared. The idiom "(void)" as a parameter list is provided for 2837 * convenience." 2838 * 2839 * Placing this check here prevents a void parameter being set up 2840 * for a function, which avoids tripping up checks for main taking 2841 * parameters and lookups of an unnamed symbol. 2842 */ 2843 if (type->is_void()) { 2844 if (this->identifier != NULL) 2845 _mesa_glsl_error(& loc, state, 2846 "named parameter cannot have type `void'"); 2847 2848 is_void = true; 2849 return NULL; 2850 } 2851 2852 if (formal_parameter && (this->identifier == NULL)) { 2853 _mesa_glsl_error(& loc, state, "formal parameter lacks a name"); 2854 return NULL; 2855 } 2856 2857 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...) 2858 * call already handled the "vec4[..] foo" case. 2859 */ 2860 if (this->is_array) { 2861 type = process_array_type(&loc, type, this->array_size, state); 2862 } 2863 2864 if (type->array_size() == 0) { 2865 _mesa_glsl_error(&loc, state, "arrays passed as parameters must have " 2866 "a declared size."); 2867 type = glsl_type::error_type; 2868 } 2869 2870 is_void = false; 2871 ir_variable *var = new(ctx) ir_variable(type, this->identifier, ir_var_in); 2872 2873 /* Apply any specified qualifiers to the parameter declaration. Note that 2874 * for function parameters the default mode is 'in'. 2875 */ 2876 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc); 2877 2878 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec: 2879 * 2880 * "Samplers cannot be treated as l-values; hence cannot be used 2881 * as out or inout function parameters, nor can they be assigned 2882 * into." 2883 */ 2884 if ((var->mode == ir_var_inout || var->mode == ir_var_out) 2885 && type->contains_sampler()) { 2886 _mesa_glsl_error(&loc, state, "out and inout parameters cannot contain samplers"); 2887 type = glsl_type::error_type; 2888 } 2889 2890 instructions->push_tail(var); 2891 2892 /* Parameter declarations do not have r-values. 2893 */ 2894 return NULL; 2895} 2896 2897 2898void 2899ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters, 2900 bool formal, 2901 exec_list *ir_parameters, 2902 _mesa_glsl_parse_state *state) 2903{ 2904 ast_parameter_declarator *void_param = NULL; 2905 unsigned count = 0; 2906 2907 foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) { 2908 param->formal_parameter = formal; 2909 param->hir(ir_parameters, state); 2910 2911 if (param->is_void) 2912 void_param = param; 2913 2914 count++; 2915 } 2916 2917 if ((void_param != NULL) && (count > 1)) { 2918 YYLTYPE loc = void_param->get_location(); 2919 2920 _mesa_glsl_error(& loc, state, 2921 "`void' parameter must be only parameter"); 2922 } 2923} 2924 2925 2926void 2927emit_function(_mesa_glsl_parse_state *state, exec_list *instructions, 2928 ir_function *f) 2929{ 2930 /* Emit the new function header */ 2931 if (state->current_function == NULL) { 2932 instructions->push_tail(f); 2933 } else { 2934 /* IR invariants disallow function declarations or definitions nested 2935 * within other function definitions. Insert the new ir_function 2936 * block in the instruction sequence before the ir_function block 2937 * containing the current ir_function_signature. 2938 */ 2939 ir_function *const curr = 2940 const_cast<ir_function *>(state->current_function->function()); 2941 2942 curr->insert_before(f); 2943 } 2944} 2945 2946 2947ir_rvalue * 2948ast_function::hir(exec_list *instructions, 2949 struct _mesa_glsl_parse_state *state) 2950{ 2951 void *ctx = state; 2952 ir_function *f = NULL; 2953 ir_function_signature *sig = NULL; 2954 exec_list hir_parameters; 2955 2956 const char *const name = identifier; 2957 2958 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec, 2959 * 2960 * "Function declarations (prototypes) cannot occur inside of functions; 2961 * they must be at global scope, or for the built-in functions, outside 2962 * the global scope." 2963 * 2964 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec, 2965 * 2966 * "User defined functions may only be defined within the global scope." 2967 * 2968 * Note that this language does not appear in GLSL 1.10. 2969 */ 2970 if ((state->current_function != NULL) && (state->language_version != 110)) { 2971 YYLTYPE loc = this->get_location(); 2972 _mesa_glsl_error(&loc, state, 2973 "declaration of function `%s' not allowed within " 2974 "function body", name); 2975 } 2976 2977 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec, 2978 * 2979 * "Identifiers starting with "gl_" are reserved for use by 2980 * OpenGL, and may not be declared in a shader as either a 2981 * variable or a function." 2982 */ 2983 if (strncmp(name, "gl_", 3) == 0) { 2984 YYLTYPE loc = this->get_location(); 2985 _mesa_glsl_error(&loc, state, 2986 "identifier `%s' uses reserved `gl_' prefix", name); 2987 } 2988 2989 /* Convert the list of function parameters to HIR now so that they can be 2990 * used below to compare this function's signature with previously seen 2991 * signatures for functions with the same name. 2992 */ 2993 ast_parameter_declarator::parameters_to_hir(& this->parameters, 2994 is_definition, 2995 & hir_parameters, state); 2996 2997 const char *return_type_name; 2998 const glsl_type *return_type = 2999 this->return_type->specifier->glsl_type(& return_type_name, state); 3000 3001 if (!return_type) { 3002 YYLTYPE loc = this->get_location(); 3003 _mesa_glsl_error(&loc, state, 3004 "function `%s' has undeclared return type `%s'", 3005 name, return_type_name); 3006 return_type = glsl_type::error_type; 3007 } 3008 3009 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec: 3010 * "No qualifier is allowed on the return type of a function." 3011 */ 3012 if (this->return_type->has_qualifiers()) { 3013 YYLTYPE loc = this->get_location(); 3014 _mesa_glsl_error(& loc, state, 3015 "function `%s' return type has qualifiers", name); 3016 } 3017 3018 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec: 3019 * 3020 * "[Sampler types] can only be declared as function parameters 3021 * or uniform variables (see Section 4.3.5 "Uniform")". 3022 */ 3023 if (return_type->contains_sampler()) { 3024 YYLTYPE loc = this->get_location(); 3025 _mesa_glsl_error(&loc, state, 3026 "function `%s' return type can't contain a sampler", 3027 name); 3028 } 3029 3030 /* Verify that this function's signature either doesn't match a previously 3031 * seen signature for a function with the same name, or, if a match is found, 3032 * that the previously seen signature does not have an associated definition. 3033 */ 3034 f = state->symbols->get_function(name); 3035 if (f != NULL && (state->es_shader || f->has_user_signature())) { 3036 sig = f->exact_matching_signature(&hir_parameters); 3037 if (sig != NULL) { 3038 const char *badvar = sig->qualifiers_match(&hir_parameters); 3039 if (badvar != NULL) { 3040 YYLTYPE loc = this->get_location(); 3041 3042 _mesa_glsl_error(&loc, state, "function `%s' parameter `%s' " 3043 "qualifiers don't match prototype", name, badvar); 3044 } 3045 3046 if (sig->return_type != return_type) { 3047 YYLTYPE loc = this->get_location(); 3048 3049 _mesa_glsl_error(&loc, state, "function `%s' return type doesn't " 3050 "match prototype", name); 3051 } 3052 3053 if (is_definition && sig->is_defined) { 3054 YYLTYPE loc = this->get_location(); 3055 3056 _mesa_glsl_error(& loc, state, "function `%s' redefined", name); 3057 } 3058 } 3059 } else { 3060 f = new(ctx) ir_function(name); 3061 if (!state->symbols->add_function(f)) { 3062 /* This function name shadows a non-function use of the same name. */ 3063 YYLTYPE loc = this->get_location(); 3064 3065 _mesa_glsl_error(&loc, state, "function name `%s' conflicts with " 3066 "non-function", name); 3067 return NULL; 3068 } 3069 3070 emit_function(state, instructions, f); 3071 } 3072 3073 /* Verify the return type of main() */ 3074 if (strcmp(name, "main") == 0) { 3075 if (! return_type->is_void()) { 3076 YYLTYPE loc = this->get_location(); 3077 3078 _mesa_glsl_error(& loc, state, "main() must return void"); 3079 } 3080 3081 if (!hir_parameters.is_empty()) { 3082 YYLTYPE loc = this->get_location(); 3083 3084 _mesa_glsl_error(& loc, state, "main() must not take any parameters"); 3085 } 3086 } 3087 3088 /* Finish storing the information about this new function in its signature. 3089 */ 3090 if (sig == NULL) { 3091 sig = new(ctx) ir_function_signature(return_type); 3092 f->add_signature(sig); 3093 } 3094 3095 sig->replace_parameters(&hir_parameters); 3096 signature = sig; 3097 3098 /* Function declarations (prototypes) do not have r-values. 3099 */ 3100 return NULL; 3101} 3102 3103 3104ir_rvalue * 3105ast_function_definition::hir(exec_list *instructions, 3106 struct _mesa_glsl_parse_state *state) 3107{ 3108 prototype->is_definition = true; 3109 prototype->hir(instructions, state); 3110 3111 ir_function_signature *signature = prototype->signature; 3112 if (signature == NULL) 3113 return NULL; 3114 3115 assert(state->current_function == NULL); 3116 state->current_function = signature; 3117 state->found_return = false; 3118 3119 /* Duplicate parameters declared in the prototype as concrete variables. 3120 * Add these to the symbol table. 3121 */ 3122 state->symbols->push_scope(); 3123 foreach_iter(exec_list_iterator, iter, signature->parameters) { 3124 ir_variable *const var = ((ir_instruction *) iter.get())->as_variable(); 3125 3126 assert(var != NULL); 3127 3128 /* The only way a parameter would "exist" is if two parameters have 3129 * the same name. 3130 */ 3131 if (state->symbols->name_declared_this_scope(var->name)) { 3132 YYLTYPE loc = this->get_location(); 3133 3134 _mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name); 3135 } else { 3136 state->symbols->add_variable(var); 3137 } 3138 } 3139 3140 /* Convert the body of the function to HIR. */ 3141 this->body->hir(&signature->body, state); 3142 signature->is_defined = true; 3143 3144 state->symbols->pop_scope(); 3145 3146 assert(state->current_function == signature); 3147 state->current_function = NULL; 3148 3149 if (!signature->return_type->is_void() && !state->found_return) { 3150 YYLTYPE loc = this->get_location(); 3151 _mesa_glsl_error(& loc, state, "function `%s' has non-void return type " 3152 "%s, but no return statement", 3153 signature->function_name(), 3154 signature->return_type->name); 3155 } 3156 3157 /* Function definitions do not have r-values. 3158 */ 3159 return NULL; 3160} 3161 3162 3163ir_rvalue * 3164ast_jump_statement::hir(exec_list *instructions, 3165 struct _mesa_glsl_parse_state *state) 3166{ 3167 void *ctx = state; 3168 3169 switch (mode) { 3170 case ast_return: { 3171 ir_return *inst; 3172 assert(state->current_function); 3173 3174 if (opt_return_value) { 3175 ir_rvalue *const ret = opt_return_value->hir(instructions, state); 3176 3177 /* The value of the return type can be NULL if the shader says 3178 * 'return foo();' and foo() is a function that returns void. 3179 * 3180 * NOTE: The GLSL spec doesn't say that this is an error. The type 3181 * of the return value is void. If the return type of the function is 3182 * also void, then this should compile without error. Seriously. 3183 */ 3184 const glsl_type *const ret_type = 3185 (ret == NULL) ? glsl_type::void_type : ret->type; 3186 3187 /* Implicit conversions are not allowed for return values. */ 3188 if (state->current_function->return_type != ret_type) { 3189 YYLTYPE loc = this->get_location(); 3190 3191 _mesa_glsl_error(& loc, state, 3192 "`return' with wrong type %s, in function `%s' " 3193 "returning %s", 3194 ret_type->name, 3195 state->current_function->function_name(), 3196 state->current_function->return_type->name); 3197 } 3198 3199 inst = new(ctx) ir_return(ret); 3200 } else { 3201 if (state->current_function->return_type->base_type != 3202 GLSL_TYPE_VOID) { 3203 YYLTYPE loc = this->get_location(); 3204 3205 _mesa_glsl_error(& loc, state, 3206 "`return' with no value, in function %s returning " 3207 "non-void", 3208 state->current_function->function_name()); 3209 } 3210 inst = new(ctx) ir_return; 3211 } 3212 3213 state->found_return = true; 3214 instructions->push_tail(inst); 3215 break; 3216 } 3217 3218 case ast_discard: 3219 if (state->target != fragment_shader) { 3220 YYLTYPE loc = this->get_location(); 3221 3222 _mesa_glsl_error(& loc, state, 3223 "`discard' may only appear in a fragment shader"); 3224 } 3225 instructions->push_tail(new(ctx) ir_discard); 3226 break; 3227 3228 case ast_break: 3229 case ast_continue: 3230 /* FINISHME: Handle switch-statements. They cannot contain 'continue', 3231 * FINISHME: and they use a different IR instruction for 'break'. 3232 */ 3233 /* FINISHME: Correctly handle the nesting. If a switch-statement is 3234 * FINISHME: inside a loop, a 'continue' is valid and will bind to the 3235 * FINISHME: loop. 3236 */ 3237 if (state->loop_or_switch_nesting == NULL) { 3238 YYLTYPE loc = this->get_location(); 3239 3240 _mesa_glsl_error(& loc, state, 3241 "`%s' may only appear in a loop", 3242 (mode == ast_break) ? "break" : "continue"); 3243 } else { 3244 ir_loop *const loop = state->loop_or_switch_nesting->as_loop(); 3245 3246 /* Inline the for loop expression again, since we don't know 3247 * where near the end of the loop body the normal copy of it 3248 * is going to be placed. 3249 */ 3250 if (mode == ast_continue && 3251 state->loop_or_switch_nesting_ast->rest_expression) { 3252 state->loop_or_switch_nesting_ast->rest_expression->hir(instructions, 3253 state); 3254 } 3255 3256 if (loop != NULL) { 3257 ir_loop_jump *const jump = 3258 new(ctx) ir_loop_jump((mode == ast_break) 3259 ? ir_loop_jump::jump_break 3260 : ir_loop_jump::jump_continue); 3261 instructions->push_tail(jump); 3262 } 3263 } 3264 3265 break; 3266 } 3267 3268 /* Jump instructions do not have r-values. 3269 */ 3270 return NULL; 3271} 3272 3273 3274ir_rvalue * 3275ast_selection_statement::hir(exec_list *instructions, 3276 struct _mesa_glsl_parse_state *state) 3277{ 3278 void *ctx = state; 3279 3280 ir_rvalue *const condition = this->condition->hir(instructions, state); 3281 3282 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec: 3283 * 3284 * "Any expression whose type evaluates to a Boolean can be used as the 3285 * conditional expression bool-expression. Vector types are not accepted 3286 * as the expression to if." 3287 * 3288 * The checks are separated so that higher quality diagnostics can be 3289 * generated for cases where both rules are violated. 3290 */ 3291 if (!condition->type->is_boolean() || !condition->type->is_scalar()) { 3292 YYLTYPE loc = this->condition->get_location(); 3293 3294 _mesa_glsl_error(& loc, state, "if-statement condition must be scalar " 3295 "boolean"); 3296 } 3297 3298 ir_if *const stmt = new(ctx) ir_if(condition); 3299 3300 if (then_statement != NULL) { 3301 state->symbols->push_scope(); 3302 then_statement->hir(& stmt->then_instructions, state); 3303 state->symbols->pop_scope(); 3304 } 3305 3306 if (else_statement != NULL) { 3307 state->symbols->push_scope(); 3308 else_statement->hir(& stmt->else_instructions, state); 3309 state->symbols->pop_scope(); 3310 } 3311 3312 instructions->push_tail(stmt); 3313 3314 /* if-statements do not have r-values. 3315 */ 3316 return NULL; 3317} 3318 3319 3320void 3321ast_iteration_statement::condition_to_hir(ir_loop *stmt, 3322 struct _mesa_glsl_parse_state *state) 3323{ 3324 void *ctx = state; 3325 3326 if (condition != NULL) { 3327 ir_rvalue *const cond = 3328 condition->hir(& stmt->body_instructions, state); 3329 3330 if ((cond == NULL) 3331 || !cond->type->is_boolean() || !cond->type->is_scalar()) { 3332 YYLTYPE loc = condition->get_location(); 3333 3334 _mesa_glsl_error(& loc, state, 3335 "loop condition must be scalar boolean"); 3336 } else { 3337 /* As the first code in the loop body, generate a block that looks 3338 * like 'if (!condition) break;' as the loop termination condition. 3339 */ 3340 ir_rvalue *const not_cond = 3341 new(ctx) ir_expression(ir_unop_logic_not, glsl_type::bool_type, cond, 3342 NULL); 3343 3344 ir_if *const if_stmt = new(ctx) ir_if(not_cond); 3345 3346 ir_jump *const break_stmt = 3347 new(ctx) ir_loop_jump(ir_loop_jump::jump_break); 3348 3349 if_stmt->then_instructions.push_tail(break_stmt); 3350 stmt->body_instructions.push_tail(if_stmt); 3351 } 3352 } 3353} 3354 3355 3356ir_rvalue * 3357ast_iteration_statement::hir(exec_list *instructions, 3358 struct _mesa_glsl_parse_state *state) 3359{ 3360 void *ctx = state; 3361 3362 /* For-loops and while-loops start a new scope, but do-while loops do not. 3363 */ 3364 if (mode != ast_do_while) 3365 state->symbols->push_scope(); 3366 3367 if (init_statement != NULL) 3368 init_statement->hir(instructions, state); 3369 3370 ir_loop *const stmt = new(ctx) ir_loop(); 3371 instructions->push_tail(stmt); 3372 3373 /* Track the current loop and / or switch-statement nesting. 3374 */ 3375 ir_instruction *const nesting = state->loop_or_switch_nesting; 3376 ast_iteration_statement *nesting_ast = state->loop_or_switch_nesting_ast; 3377 3378 state->loop_or_switch_nesting = stmt; 3379 state->loop_or_switch_nesting_ast = this; 3380 3381 if (mode != ast_do_while) 3382 condition_to_hir(stmt, state); 3383 3384 if (body != NULL) 3385 body->hir(& stmt->body_instructions, state); 3386 3387 if (rest_expression != NULL) 3388 rest_expression->hir(& stmt->body_instructions, state); 3389 3390 if (mode == ast_do_while) 3391 condition_to_hir(stmt, state); 3392 3393 if (mode != ast_do_while) 3394 state->symbols->pop_scope(); 3395 3396 /* Restore previous nesting before returning. 3397 */ 3398 state->loop_or_switch_nesting = nesting; 3399 state->loop_or_switch_nesting_ast = nesting_ast; 3400 3401 /* Loops do not have r-values. 3402 */ 3403 return NULL; 3404} 3405 3406 3407ir_rvalue * 3408ast_type_specifier::hir(exec_list *instructions, 3409 struct _mesa_glsl_parse_state *state) 3410{ 3411 if (!this->is_precision_statement && this->structure == NULL) 3412 return NULL; 3413 3414 YYLTYPE loc = this->get_location(); 3415 3416 if (this->precision != ast_precision_none 3417 && state->language_version != 100 3418 && state->language_version < 130) { 3419 _mesa_glsl_error(&loc, state, 3420 "precision qualifiers exist only in " 3421 "GLSL ES 1.00, and GLSL 1.30 and later"); 3422 return NULL; 3423 } 3424 if (this->precision != ast_precision_none 3425 && this->structure != NULL) { 3426 _mesa_glsl_error(&loc, state, 3427 "precision qualifiers do not apply to structures"); 3428 return NULL; 3429 } 3430 3431 /* If this is a precision statement, check that the type to which it is 3432 * applied is either float or int. 3433 * 3434 * From section 4.5.3 of the GLSL 1.30 spec: 3435 * "The precision statement 3436 * precision precision-qualifier type; 3437 * can be used to establish a default precision qualifier. The type 3438 * field can be either int or float [...]. Any other types or 3439 * qualifiers will result in an error. 3440 */ 3441 if (this->is_precision_statement) { 3442 assert(this->precision != ast_precision_none); 3443 assert(this->structure == NULL); /* The check for structures was 3444 * performed above. */ 3445 if (this->is_array) { 3446 _mesa_glsl_error(&loc, state, 3447 "default precision statements do not apply to " 3448 "arrays"); 3449 return NULL; 3450 } 3451 if (this->type_specifier != ast_float 3452 && this->type_specifier != ast_int) { 3453 _mesa_glsl_error(&loc, state, 3454 "default precision statements apply only to types " 3455 "float and int"); 3456 return NULL; 3457 } 3458 3459 /* FINISHME: Translate precision statements into IR. */ 3460 return NULL; 3461 } 3462 3463 if (this->structure != NULL) 3464 return this->structure->hir(instructions, state); 3465 3466 return NULL; 3467} 3468 3469 3470ir_rvalue * 3471ast_struct_specifier::hir(exec_list *instructions, 3472 struct _mesa_glsl_parse_state *state) 3473{ 3474 unsigned decl_count = 0; 3475 3476 /* Make an initial pass over the list of structure fields to determine how 3477 * many there are. Each element in this list is an ast_declarator_list. 3478 * This means that we actually need to count the number of elements in the 3479 * 'declarations' list in each of the elements. 3480 */ 3481 foreach_list_typed (ast_declarator_list, decl_list, link, 3482 &this->declarations) { 3483 foreach_list_const (decl_ptr, & decl_list->declarations) { 3484 decl_count++; 3485 } 3486 } 3487 3488 /* Allocate storage for the structure fields and process the field 3489 * declarations. As the declarations are processed, try to also convert 3490 * the types to HIR. This ensures that structure definitions embedded in 3491 * other structure definitions are processed. 3492 */ 3493 glsl_struct_field *const fields = ralloc_array(state, glsl_struct_field, 3494 decl_count); 3495 3496 unsigned i = 0; 3497 foreach_list_typed (ast_declarator_list, decl_list, link, 3498 &this->declarations) { 3499 const char *type_name; 3500 3501 decl_list->type->specifier->hir(instructions, state); 3502 3503 /* Section 10.9 of the GLSL ES 1.00 specification states that 3504 * embedded structure definitions have been removed from the language. 3505 */ 3506 if (state->es_shader && decl_list->type->specifier->structure != NULL) { 3507 YYLTYPE loc = this->get_location(); 3508 _mesa_glsl_error(&loc, state, "Embedded structure definitions are " 3509 "not allowed in GLSL ES 1.00."); 3510 } 3511 3512 const glsl_type *decl_type = 3513 decl_list->type->specifier->glsl_type(& type_name, state); 3514 3515 foreach_list_typed (ast_declaration, decl, link, 3516 &decl_list->declarations) { 3517 const struct glsl_type *field_type = decl_type; 3518 if (decl->is_array) { 3519 YYLTYPE loc = decl->get_location(); 3520 field_type = process_array_type(&loc, decl_type, decl->array_size, 3521 state); 3522 } 3523 fields[i].type = (field_type != NULL) 3524 ? field_type : glsl_type::error_type; 3525 fields[i].name = decl->identifier; 3526 i++; 3527 } 3528 } 3529 3530 assert(i == decl_count); 3531 3532 const glsl_type *t = 3533 glsl_type::get_record_instance(fields, decl_count, this->name); 3534 3535 YYLTYPE loc = this->get_location(); 3536 if (!state->symbols->add_type(name, t)) { 3537 _mesa_glsl_error(& loc, state, "struct `%s' previously defined", name); 3538 } else { 3539 const glsl_type **s = reralloc(state, state->user_structures, 3540 const glsl_type *, 3541 state->num_user_structures + 1); 3542 if (s != NULL) { 3543 s[state->num_user_structures] = t; 3544 state->user_structures = s; 3545 state->num_user_structures++; 3546 } 3547 } 3548 3549 /* Structure type definitions do not have r-values. 3550 */ 3551 return NULL; 3552} 3553