ast_to_hir.cpp revision 02c5ae1b3fef75d5c0a715313a69e6b95ebd5b95
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 detect_recursion_unlinked(state, instructions); 88} 89 90 91/** 92 * If a conversion is available, convert one operand to a different type 93 * 94 * The \c from \c ir_rvalue is converted "in place". 95 * 96 * \param to Type that the operand it to be converted to 97 * \param from Operand that is being converted 98 * \param state GLSL compiler state 99 * 100 * \return 101 * If a conversion is possible (or unnecessary), \c true is returned. 102 * Otherwise \c false is returned. 103 */ 104bool 105apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from, 106 struct _mesa_glsl_parse_state *state) 107{ 108 void *ctx = state; 109 if (to->base_type == from->type->base_type) 110 return true; 111 112 /* This conversion was added in GLSL 1.20. If the compilation mode is 113 * GLSL 1.10, the conversion is skipped. 114 */ 115 if (state->language_version < 120) 116 return false; 117 118 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec: 119 * 120 * "There are no implicit array or structure conversions. For 121 * example, an array of int cannot be implicitly converted to an 122 * array of float. There are no implicit conversions between 123 * signed and unsigned integers." 124 */ 125 /* FINISHME: The above comment is partially a lie. There is int/uint 126 * FINISHME: conversion for immediate constants. 127 */ 128 if (!to->is_float() || !from->type->is_numeric()) 129 return false; 130 131 /* Convert to a floating point type with the same number of components 132 * as the original type - i.e. int to float, not int to vec4. 133 */ 134 to = glsl_type::get_instance(GLSL_TYPE_FLOAT, from->type->vector_elements, 135 from->type->matrix_columns); 136 137 switch (from->type->base_type) { 138 case GLSL_TYPE_INT: 139 from = new(ctx) ir_expression(ir_unop_i2f, to, from, NULL); 140 break; 141 case GLSL_TYPE_UINT: 142 from = new(ctx) ir_expression(ir_unop_u2f, to, from, NULL); 143 break; 144 case GLSL_TYPE_BOOL: 145 from = new(ctx) ir_expression(ir_unop_b2f, to, from, NULL); 146 break; 147 default: 148 assert(0); 149 } 150 151 return true; 152} 153 154 155static const struct glsl_type * 156arithmetic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b, 157 bool multiply, 158 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 159{ 160 const glsl_type *type_a = value_a->type; 161 const glsl_type *type_b = value_b->type; 162 163 /* From GLSL 1.50 spec, page 56: 164 * 165 * "The arithmetic binary operators add (+), subtract (-), 166 * multiply (*), and divide (/) operate on integer and 167 * floating-point scalars, vectors, and matrices." 168 */ 169 if (!type_a->is_numeric() || !type_b->is_numeric()) { 170 _mesa_glsl_error(loc, state, 171 "Operands to arithmetic operators must be numeric"); 172 return glsl_type::error_type; 173 } 174 175 176 /* "If one operand is floating-point based and the other is 177 * not, then the conversions from Section 4.1.10 "Implicit 178 * Conversions" are applied to the non-floating-point-based operand." 179 */ 180 if (!apply_implicit_conversion(type_a, value_b, state) 181 && !apply_implicit_conversion(type_b, value_a, state)) { 182 _mesa_glsl_error(loc, state, 183 "Could not implicitly convert operands to " 184 "arithmetic operator"); 185 return glsl_type::error_type; 186 } 187 type_a = value_a->type; 188 type_b = value_b->type; 189 190 /* "If the operands are integer types, they must both be signed or 191 * both be unsigned." 192 * 193 * From this rule and the preceeding conversion it can be inferred that 194 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT. 195 * The is_numeric check above already filtered out the case where either 196 * type is not one of these, so now the base types need only be tested for 197 * equality. 198 */ 199 if (type_a->base_type != type_b->base_type) { 200 _mesa_glsl_error(loc, state, 201 "base type mismatch for arithmetic operator"); 202 return glsl_type::error_type; 203 } 204 205 /* "All arithmetic binary operators result in the same fundamental type 206 * (signed integer, unsigned integer, or floating-point) as the 207 * operands they operate on, after operand type conversion. After 208 * conversion, the following cases are valid 209 * 210 * * The two operands are scalars. In this case the operation is 211 * applied, resulting in a scalar." 212 */ 213 if (type_a->is_scalar() && type_b->is_scalar()) 214 return type_a; 215 216 /* "* One operand is a scalar, and the other is a vector or matrix. 217 * In this case, the scalar operation is applied independently to each 218 * component of the vector or matrix, resulting in the same size 219 * vector or matrix." 220 */ 221 if (type_a->is_scalar()) { 222 if (!type_b->is_scalar()) 223 return type_b; 224 } else if (type_b->is_scalar()) { 225 return type_a; 226 } 227 228 /* All of the combinations of <scalar, scalar>, <vector, scalar>, 229 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been 230 * handled. 231 */ 232 assert(!type_a->is_scalar()); 233 assert(!type_b->is_scalar()); 234 235 /* "* The two operands are vectors of the same size. In this case, the 236 * operation is done component-wise resulting in the same size 237 * vector." 238 */ 239 if (type_a->is_vector() && type_b->is_vector()) { 240 if (type_a == type_b) { 241 return type_a; 242 } else { 243 _mesa_glsl_error(loc, state, 244 "vector size mismatch for arithmetic operator"); 245 return glsl_type::error_type; 246 } 247 } 248 249 /* All of the combinations of <scalar, scalar>, <vector, scalar>, 250 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and 251 * <vector, vector> have been handled. At least one of the operands must 252 * be matrix. Further, since there are no integer matrix types, the base 253 * type of both operands must be float. 254 */ 255 assert(type_a->is_matrix() || type_b->is_matrix()); 256 assert(type_a->base_type == GLSL_TYPE_FLOAT); 257 assert(type_b->base_type == GLSL_TYPE_FLOAT); 258 259 /* "* The operator is add (+), subtract (-), or divide (/), and the 260 * operands are matrices with the same number of rows and the same 261 * number of columns. In this case, the operation is done component- 262 * wise resulting in the same size matrix." 263 * * The operator is multiply (*), where both operands are matrices or 264 * one operand is a vector and the other a matrix. A right vector 265 * operand is treated as a column vector and a left vector operand as a 266 * row vector. In all these cases, it is required that the number of 267 * columns of the left operand is equal to the number of rows of the 268 * right operand. Then, the multiply (*) operation does a linear 269 * algebraic multiply, yielding an object that has the same number of 270 * rows as the left operand and the same number of columns as the right 271 * operand. Section 5.10 "Vector and Matrix Operations" explains in 272 * more detail how vectors and matrices are operated on." 273 */ 274 if (! multiply) { 275 if (type_a == type_b) 276 return type_a; 277 } else { 278 if (type_a->is_matrix() && type_b->is_matrix()) { 279 /* Matrix multiply. The columns of A must match the rows of B. Given 280 * the other previously tested constraints, this means the vector type 281 * of a row from A must be the same as the vector type of a column from 282 * B. 283 */ 284 if (type_a->row_type() == type_b->column_type()) { 285 /* The resulting matrix has the number of columns of matrix B and 286 * the number of rows of matrix A. We get the row count of A by 287 * looking at the size of a vector that makes up a column. The 288 * transpose (size of a row) is done for B. 289 */ 290 const glsl_type *const type = 291 glsl_type::get_instance(type_a->base_type, 292 type_a->column_type()->vector_elements, 293 type_b->row_type()->vector_elements); 294 assert(type != glsl_type::error_type); 295 296 return type; 297 } 298 } else if (type_a->is_matrix()) { 299 /* A is a matrix and B is a column vector. Columns of A must match 300 * rows of B. Given the other previously tested constraints, this 301 * means the vector type of a row from A must be the same as the 302 * vector the type of B. 303 */ 304 if (type_a->row_type() == type_b) { 305 /* The resulting vector has a number of elements equal to 306 * the number of rows of matrix A. */ 307 const glsl_type *const type = 308 glsl_type::get_instance(type_a->base_type, 309 type_a->column_type()->vector_elements, 310 1); 311 assert(type != glsl_type::error_type); 312 313 return type; 314 } 315 } else { 316 assert(type_b->is_matrix()); 317 318 /* A is a row vector and B is a matrix. Columns of A must match rows 319 * of B. Given the other previously tested constraints, this means 320 * the type of A must be the same as the vector type of a column from 321 * B. 322 */ 323 if (type_a == type_b->column_type()) { 324 /* The resulting vector has a number of elements equal to 325 * the number of columns of matrix B. */ 326 const glsl_type *const type = 327 glsl_type::get_instance(type_a->base_type, 328 type_b->row_type()->vector_elements, 329 1); 330 assert(type != glsl_type::error_type); 331 332 return type; 333 } 334 } 335 336 _mesa_glsl_error(loc, state, "size mismatch for matrix multiplication"); 337 return glsl_type::error_type; 338 } 339 340 341 /* "All other cases are illegal." 342 */ 343 _mesa_glsl_error(loc, state, "type mismatch"); 344 return glsl_type::error_type; 345} 346 347 348static const struct glsl_type * 349unary_arithmetic_result_type(const struct glsl_type *type, 350 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 351{ 352 /* From GLSL 1.50 spec, page 57: 353 * 354 * "The arithmetic unary operators negate (-), post- and pre-increment 355 * and decrement (-- and ++) operate on integer or floating-point 356 * values (including vectors and matrices). All unary operators work 357 * component-wise on their operands. These result with the same type 358 * they operated on." 359 */ 360 if (!type->is_numeric()) { 361 _mesa_glsl_error(loc, state, 362 "Operands to arithmetic operators must be numeric"); 363 return glsl_type::error_type; 364 } 365 366 return type; 367} 368 369/** 370 * \brief Return the result type of a bit-logic operation. 371 * 372 * If the given types to the bit-logic operator are invalid, return 373 * glsl_type::error_type. 374 * 375 * \param type_a Type of LHS of bit-logic op 376 * \param type_b Type of RHS of bit-logic op 377 */ 378static const struct glsl_type * 379bit_logic_result_type(const struct glsl_type *type_a, 380 const struct glsl_type *type_b, 381 ast_operators op, 382 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 383{ 384 if (state->language_version < 130) { 385 _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30"); 386 return glsl_type::error_type; 387 } 388 389 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec: 390 * 391 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or 392 * (|). The operands must be of type signed or unsigned integers or 393 * integer vectors." 394 */ 395 if (!type_a->is_integer()) { 396 _mesa_glsl_error(loc, state, "LHS of `%s' must be an integer", 397 ast_expression::operator_string(op)); 398 return glsl_type::error_type; 399 } 400 if (!type_b->is_integer()) { 401 _mesa_glsl_error(loc, state, "RHS of `%s' must be an integer", 402 ast_expression::operator_string(op)); 403 return glsl_type::error_type; 404 } 405 406 /* "The fundamental types of the operands (signed or unsigned) must 407 * match," 408 */ 409 if (type_a->base_type != type_b->base_type) { 410 _mesa_glsl_error(loc, state, "operands of `%s' must have the same " 411 "base type", ast_expression::operator_string(op)); 412 return glsl_type::error_type; 413 } 414 415 /* "The operands cannot be vectors of differing size." */ 416 if (type_a->is_vector() && 417 type_b->is_vector() && 418 type_a->vector_elements != type_b->vector_elements) { 419 _mesa_glsl_error(loc, state, "operands of `%s' cannot be vectors of " 420 "different sizes", ast_expression::operator_string(op)); 421 return glsl_type::error_type; 422 } 423 424 /* "If one operand is a scalar and the other a vector, the scalar is 425 * applied component-wise to the vector, resulting in the same type as 426 * the vector. The fundamental types of the operands [...] will be the 427 * resulting fundamental type." 428 */ 429 if (type_a->is_scalar()) 430 return type_b; 431 else 432 return type_a; 433} 434 435static const struct glsl_type * 436modulus_result_type(const struct glsl_type *type_a, 437 const struct glsl_type *type_b, 438 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 439{ 440 if (state->language_version < 130) { 441 _mesa_glsl_error(loc, state, 442 "operator '%%' is reserved in %s", 443 state->version_string); 444 return glsl_type::error_type; 445 } 446 447 /* From GLSL 1.50 spec, page 56: 448 * "The operator modulus (%) operates on signed or unsigned integers or 449 * integer vectors. The operand types must both be signed or both be 450 * unsigned." 451 */ 452 if (!type_a->is_integer()) { 453 _mesa_glsl_error(loc, state, "LHS of operator %% must be an integer."); 454 return glsl_type::error_type; 455 } 456 if (!type_b->is_integer()) { 457 _mesa_glsl_error(loc, state, "RHS of operator %% must be an integer."); 458 return glsl_type::error_type; 459 } 460 if (type_a->base_type != type_b->base_type) { 461 _mesa_glsl_error(loc, state, 462 "operands of %% must have the same base type"); 463 return glsl_type::error_type; 464 } 465 466 /* "The operands cannot be vectors of differing size. If one operand is 467 * a scalar and the other vector, then the scalar is applied component- 468 * wise to the vector, resulting in the same type as the vector. If both 469 * are vectors of the same size, the result is computed component-wise." 470 */ 471 if (type_a->is_vector()) { 472 if (!type_b->is_vector() 473 || (type_a->vector_elements == type_b->vector_elements)) 474 return type_a; 475 } else 476 return type_b; 477 478 /* "The operator modulus (%) is not defined for any other data types 479 * (non-integer types)." 480 */ 481 _mesa_glsl_error(loc, state, "type mismatch"); 482 return glsl_type::error_type; 483} 484 485 486static const struct glsl_type * 487relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b, 488 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 489{ 490 const glsl_type *type_a = value_a->type; 491 const glsl_type *type_b = value_b->type; 492 493 /* From GLSL 1.50 spec, page 56: 494 * "The relational operators greater than (>), less than (<), greater 495 * than or equal (>=), and less than or equal (<=) operate only on 496 * scalar integer and scalar floating-point expressions." 497 */ 498 if (!type_a->is_numeric() 499 || !type_b->is_numeric() 500 || !type_a->is_scalar() 501 || !type_b->is_scalar()) { 502 _mesa_glsl_error(loc, state, 503 "Operands to relational operators must be scalar and " 504 "numeric"); 505 return glsl_type::error_type; 506 } 507 508 /* "Either the operands' types must match, or the conversions from 509 * Section 4.1.10 "Implicit Conversions" will be applied to the integer 510 * operand, after which the types must match." 511 */ 512 if (!apply_implicit_conversion(type_a, value_b, state) 513 && !apply_implicit_conversion(type_b, value_a, state)) { 514 _mesa_glsl_error(loc, state, 515 "Could not implicitly convert operands to " 516 "relational operator"); 517 return glsl_type::error_type; 518 } 519 type_a = value_a->type; 520 type_b = value_b->type; 521 522 if (type_a->base_type != type_b->base_type) { 523 _mesa_glsl_error(loc, state, "base type mismatch"); 524 return glsl_type::error_type; 525 } 526 527 /* "The result is scalar Boolean." 528 */ 529 return glsl_type::bool_type; 530} 531 532/** 533 * \brief Return the result type of a bit-shift operation. 534 * 535 * If the given types to the bit-shift operator are invalid, return 536 * glsl_type::error_type. 537 * 538 * \param type_a Type of LHS of bit-shift op 539 * \param type_b Type of RHS of bit-shift op 540 */ 541static const struct glsl_type * 542shift_result_type(const struct glsl_type *type_a, 543 const struct glsl_type *type_b, 544 ast_operators op, 545 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 546{ 547 if (state->language_version < 130) { 548 _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30"); 549 return glsl_type::error_type; 550 } 551 552 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec: 553 * 554 * "The shift operators (<<) and (>>). For both operators, the operands 555 * must be signed or unsigned integers or integer vectors. One operand 556 * can be signed while the other is unsigned." 557 */ 558 if (!type_a->is_integer()) { 559 _mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or " 560 "integer vector", ast_expression::operator_string(op)); 561 return glsl_type::error_type; 562 563 } 564 if (!type_b->is_integer()) { 565 _mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or " 566 "integer vector", ast_expression::operator_string(op)); 567 return glsl_type::error_type; 568 } 569 570 /* "If the first operand is a scalar, the second operand has to be 571 * a scalar as well." 572 */ 573 if (type_a->is_scalar() && !type_b->is_scalar()) { 574 _mesa_glsl_error(loc, state, "If the first operand of %s is scalar, the " 575 "second must be scalar as well", 576 ast_expression::operator_string(op)); 577 return glsl_type::error_type; 578 } 579 580 /* If both operands are vectors, check that they have same number of 581 * elements. 582 */ 583 if (type_a->is_vector() && 584 type_b->is_vector() && 585 type_a->vector_elements != type_b->vector_elements) { 586 _mesa_glsl_error(loc, state, "Vector operands to operator %s must " 587 "have same number of elements", 588 ast_expression::operator_string(op)); 589 return glsl_type::error_type; 590 } 591 592 /* "In all cases, the resulting type will be the same type as the left 593 * operand." 594 */ 595 return type_a; 596} 597 598/** 599 * Validates that a value can be assigned to a location with a specified type 600 * 601 * Validates that \c rhs can be assigned to some location. If the types are 602 * not an exact match but an automatic conversion is possible, \c rhs will be 603 * converted. 604 * 605 * \return 606 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type. 607 * Otherwise the actual RHS to be assigned will be returned. This may be 608 * \c rhs, or it may be \c rhs after some type conversion. 609 * 610 * \note 611 * In addition to being used for assignments, this function is used to 612 * type-check return values. 613 */ 614ir_rvalue * 615validate_assignment(struct _mesa_glsl_parse_state *state, 616 const glsl_type *lhs_type, ir_rvalue *rhs, 617 bool is_initializer) 618{ 619 /* If there is already some error in the RHS, just return it. Anything 620 * else will lead to an avalanche of error message back to the user. 621 */ 622 if (rhs->type->is_error()) 623 return rhs; 624 625 /* If the types are identical, the assignment can trivially proceed. 626 */ 627 if (rhs->type == lhs_type) 628 return rhs; 629 630 /* If the array element types are the same and the size of the LHS is zero, 631 * the assignment is okay for initializers embedded in variable 632 * declarations. 633 * 634 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this 635 * is handled by ir_dereference::is_lvalue. 636 */ 637 if (is_initializer && lhs_type->is_array() && rhs->type->is_array() 638 && (lhs_type->element_type() == rhs->type->element_type()) 639 && (lhs_type->array_size() == 0)) { 640 return rhs; 641 } 642 643 /* Check for implicit conversion in GLSL 1.20 */ 644 if (apply_implicit_conversion(lhs_type, rhs, state)) { 645 if (rhs->type == lhs_type) 646 return rhs; 647 } 648 649 return NULL; 650} 651 652ir_rvalue * 653do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state, 654 ir_rvalue *lhs, ir_rvalue *rhs, bool is_initializer, 655 YYLTYPE lhs_loc) 656{ 657 void *ctx = state; 658 bool error_emitted = (lhs->type->is_error() || rhs->type->is_error()); 659 660 if (!error_emitted) { 661 if (lhs->variable_referenced() != NULL 662 && lhs->variable_referenced()->read_only) { 663 _mesa_glsl_error(&lhs_loc, state, 664 "assignment to read-only variable '%s'", 665 lhs->variable_referenced()->name); 666 error_emitted = true; 667 668 } else if (!lhs->is_lvalue()) { 669 _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment"); 670 error_emitted = true; 671 } 672 673 if (state->es_shader && lhs->type->is_array()) { 674 _mesa_glsl_error(&lhs_loc, state, "whole array assignment is not " 675 "allowed in GLSL ES 1.00."); 676 error_emitted = true; 677 } 678 } 679 680 ir_rvalue *new_rhs = 681 validate_assignment(state, lhs->type, rhs, is_initializer); 682 if (new_rhs == NULL) { 683 _mesa_glsl_error(& lhs_loc, state, "type mismatch"); 684 } else { 685 rhs = new_rhs; 686 687 /* If the LHS array was not declared with a size, it takes it size from 688 * the RHS. If the LHS is an l-value and a whole array, it must be a 689 * dereference of a variable. Any other case would require that the LHS 690 * is either not an l-value or not a whole array. 691 */ 692 if (lhs->type->array_size() == 0) { 693 ir_dereference *const d = lhs->as_dereference(); 694 695 assert(d != NULL); 696 697 ir_variable *const var = d->variable_referenced(); 698 699 assert(var != NULL); 700 701 if (var->max_array_access >= unsigned(rhs->type->array_size())) { 702 /* FINISHME: This should actually log the location of the RHS. */ 703 _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to " 704 "previous access", 705 var->max_array_access); 706 } 707 708 var->type = glsl_type::get_array_instance(lhs->type->element_type(), 709 rhs->type->array_size()); 710 d->type = var->type; 711 } 712 } 713 714 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec, 715 * but not post_inc) need the converted assigned value as an rvalue 716 * to handle things like: 717 * 718 * i = j += 1; 719 * 720 * So we always just store the computed value being assigned to a 721 * temporary and return a deref of that temporary. If the rvalue 722 * ends up not being used, the temp will get copy-propagated out. 723 */ 724 ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp", 725 ir_var_temporary); 726 ir_dereference_variable *deref_var = new(ctx) ir_dereference_variable(var); 727 instructions->push_tail(var); 728 instructions->push_tail(new(ctx) ir_assignment(deref_var, 729 rhs, 730 NULL)); 731 deref_var = new(ctx) ir_dereference_variable(var); 732 733 if (!error_emitted) 734 instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var, NULL)); 735 736 return new(ctx) ir_dereference_variable(var); 737} 738 739static ir_rvalue * 740get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue) 741{ 742 void *ctx = ralloc_parent(lvalue); 743 ir_variable *var; 744 745 var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp", 746 ir_var_temporary); 747 instructions->push_tail(var); 748 var->mode = ir_var_auto; 749 750 instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var), 751 lvalue, NULL)); 752 753 /* Once we've created this temporary, mark it read only so it's no 754 * longer considered an lvalue. 755 */ 756 var->read_only = true; 757 758 return new(ctx) ir_dereference_variable(var); 759} 760 761 762ir_rvalue * 763ast_node::hir(exec_list *instructions, 764 struct _mesa_glsl_parse_state *state) 765{ 766 (void) instructions; 767 (void) state; 768 769 return NULL; 770} 771 772static void 773mark_whole_array_access(ir_rvalue *access) 774{ 775 ir_dereference_variable *deref = access->as_dereference_variable(); 776 777 if (deref) { 778 deref->var->max_array_access = deref->type->length - 1; 779 } 780} 781 782static ir_rvalue * 783do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1) 784{ 785 int join_op; 786 ir_rvalue *cmp = NULL; 787 788 if (operation == ir_binop_all_equal) 789 join_op = ir_binop_logic_and; 790 else 791 join_op = ir_binop_logic_or; 792 793 switch (op0->type->base_type) { 794 case GLSL_TYPE_FLOAT: 795 case GLSL_TYPE_UINT: 796 case GLSL_TYPE_INT: 797 case GLSL_TYPE_BOOL: 798 return new(mem_ctx) ir_expression(operation, op0, op1); 799 800 case GLSL_TYPE_ARRAY: { 801 for (unsigned int i = 0; i < op0->type->length; i++) { 802 ir_rvalue *e0, *e1, *result; 803 804 e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL), 805 new(mem_ctx) ir_constant(i)); 806 e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL), 807 new(mem_ctx) ir_constant(i)); 808 result = do_comparison(mem_ctx, operation, e0, e1); 809 810 if (cmp) { 811 cmp = new(mem_ctx) ir_expression(join_op, cmp, result); 812 } else { 813 cmp = result; 814 } 815 } 816 817 mark_whole_array_access(op0); 818 mark_whole_array_access(op1); 819 break; 820 } 821 822 case GLSL_TYPE_STRUCT: { 823 for (unsigned int i = 0; i < op0->type->length; i++) { 824 ir_rvalue *e0, *e1, *result; 825 const char *field_name = op0->type->fields.structure[i].name; 826 827 e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL), 828 field_name); 829 e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL), 830 field_name); 831 result = do_comparison(mem_ctx, operation, e0, e1); 832 833 if (cmp) { 834 cmp = new(mem_ctx) ir_expression(join_op, cmp, result); 835 } else { 836 cmp = result; 837 } 838 } 839 break; 840 } 841 842 case GLSL_TYPE_ERROR: 843 case GLSL_TYPE_VOID: 844 case GLSL_TYPE_SAMPLER: 845 /* I assume a comparison of a struct containing a sampler just 846 * ignores the sampler present in the type. 847 */ 848 break; 849 850 default: 851 assert(!"Should not get here."); 852 break; 853 } 854 855 if (cmp == NULL) 856 cmp = new(mem_ctx) ir_constant(true); 857 858 return cmp; 859} 860 861/* For logical operations, we want to ensure that the operands are 862 * scalar booleans. If it isn't, emit an error and return a constant 863 * boolean to avoid triggering cascading error messages. 864 */ 865ir_rvalue * 866get_scalar_boolean_operand(exec_list *instructions, 867 struct _mesa_glsl_parse_state *state, 868 ast_expression *parent_expr, 869 int operand, 870 const char *operand_name, 871 bool *error_emitted) 872{ 873 ast_expression *expr = parent_expr->subexpressions[operand]; 874 void *ctx = state; 875 ir_rvalue *val = expr->hir(instructions, state); 876 877 if (val->type->is_boolean() && val->type->is_scalar()) 878 return val; 879 880 if (!*error_emitted) { 881 YYLTYPE loc = expr->get_location(); 882 _mesa_glsl_error(&loc, state, "%s of `%s' must be scalar boolean", 883 operand_name, 884 parent_expr->operator_string(parent_expr->oper)); 885 *error_emitted = true; 886 } 887 888 return new(ctx) ir_constant(true); 889} 890 891ir_rvalue * 892ast_expression::hir(exec_list *instructions, 893 struct _mesa_glsl_parse_state *state) 894{ 895 void *ctx = state; 896 static const int operations[AST_NUM_OPERATORS] = { 897 -1, /* ast_assign doesn't convert to ir_expression. */ 898 -1, /* ast_plus doesn't convert to ir_expression. */ 899 ir_unop_neg, 900 ir_binop_add, 901 ir_binop_sub, 902 ir_binop_mul, 903 ir_binop_div, 904 ir_binop_mod, 905 ir_binop_lshift, 906 ir_binop_rshift, 907 ir_binop_less, 908 ir_binop_greater, 909 ir_binop_lequal, 910 ir_binop_gequal, 911 ir_binop_all_equal, 912 ir_binop_any_nequal, 913 ir_binop_bit_and, 914 ir_binop_bit_xor, 915 ir_binop_bit_or, 916 ir_unop_bit_not, 917 ir_binop_logic_and, 918 ir_binop_logic_xor, 919 ir_binop_logic_or, 920 ir_unop_logic_not, 921 922 /* Note: The following block of expression types actually convert 923 * to multiple IR instructions. 924 */ 925 ir_binop_mul, /* ast_mul_assign */ 926 ir_binop_div, /* ast_div_assign */ 927 ir_binop_mod, /* ast_mod_assign */ 928 ir_binop_add, /* ast_add_assign */ 929 ir_binop_sub, /* ast_sub_assign */ 930 ir_binop_lshift, /* ast_ls_assign */ 931 ir_binop_rshift, /* ast_rs_assign */ 932 ir_binop_bit_and, /* ast_and_assign */ 933 ir_binop_bit_xor, /* ast_xor_assign */ 934 ir_binop_bit_or, /* ast_or_assign */ 935 936 -1, /* ast_conditional doesn't convert to ir_expression. */ 937 ir_binop_add, /* ast_pre_inc. */ 938 ir_binop_sub, /* ast_pre_dec. */ 939 ir_binop_add, /* ast_post_inc. */ 940 ir_binop_sub, /* ast_post_dec. */ 941 -1, /* ast_field_selection doesn't conv to ir_expression. */ 942 -1, /* ast_array_index doesn't convert to ir_expression. */ 943 -1, /* ast_function_call doesn't conv to ir_expression. */ 944 -1, /* ast_identifier doesn't convert to ir_expression. */ 945 -1, /* ast_int_constant doesn't convert to ir_expression. */ 946 -1, /* ast_uint_constant doesn't conv to ir_expression. */ 947 -1, /* ast_float_constant doesn't conv to ir_expression. */ 948 -1, /* ast_bool_constant doesn't conv to ir_expression. */ 949 -1, /* ast_sequence doesn't convert to ir_expression. */ 950 }; 951 ir_rvalue *result = NULL; 952 ir_rvalue *op[3]; 953 const struct glsl_type *type; /* a temporary variable for switch cases */ 954 bool error_emitted = false; 955 YYLTYPE loc; 956 957 loc = this->get_location(); 958 959 switch (this->oper) { 960 case ast_assign: { 961 op[0] = this->subexpressions[0]->hir(instructions, state); 962 op[1] = this->subexpressions[1]->hir(instructions, state); 963 964 result = do_assignment(instructions, state, op[0], op[1], false, 965 this->subexpressions[0]->get_location()); 966 error_emitted = result->type->is_error(); 967 break; 968 } 969 970 case ast_plus: 971 op[0] = this->subexpressions[0]->hir(instructions, state); 972 973 type = unary_arithmetic_result_type(op[0]->type, state, & loc); 974 975 error_emitted = type->is_error(); 976 977 result = op[0]; 978 break; 979 980 case ast_neg: 981 op[0] = this->subexpressions[0]->hir(instructions, state); 982 983 type = unary_arithmetic_result_type(op[0]->type, state, & loc); 984 985 error_emitted = type->is_error(); 986 987 result = new(ctx) ir_expression(operations[this->oper], type, 988 op[0], NULL); 989 break; 990 991 case ast_add: 992 case ast_sub: 993 case ast_mul: 994 case ast_div: 995 op[0] = this->subexpressions[0]->hir(instructions, state); 996 op[1] = this->subexpressions[1]->hir(instructions, state); 997 998 type = arithmetic_result_type(op[0], op[1], 999 (this->oper == ast_mul), 1000 state, & loc); 1001 error_emitted = type->is_error(); 1002 1003 result = new(ctx) ir_expression(operations[this->oper], type, 1004 op[0], op[1]); 1005 break; 1006 1007 case ast_mod: 1008 op[0] = this->subexpressions[0]->hir(instructions, state); 1009 op[1] = this->subexpressions[1]->hir(instructions, state); 1010 1011 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc); 1012 1013 assert(operations[this->oper] == ir_binop_mod); 1014 1015 result = new(ctx) ir_expression(operations[this->oper], type, 1016 op[0], op[1]); 1017 error_emitted = type->is_error(); 1018 break; 1019 1020 case ast_lshift: 1021 case ast_rshift: 1022 if (state->language_version < 130) { 1023 _mesa_glsl_error(&loc, state, "operator %s requires GLSL 1.30", 1024 operator_string(this->oper)); 1025 error_emitted = true; 1026 } 1027 1028 op[0] = this->subexpressions[0]->hir(instructions, state); 1029 op[1] = this->subexpressions[1]->hir(instructions, state); 1030 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state, 1031 &loc); 1032 result = new(ctx) ir_expression(operations[this->oper], type, 1033 op[0], op[1]); 1034 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1035 break; 1036 1037 case ast_less: 1038 case ast_greater: 1039 case ast_lequal: 1040 case ast_gequal: 1041 op[0] = this->subexpressions[0]->hir(instructions, state); 1042 op[1] = this->subexpressions[1]->hir(instructions, state); 1043 1044 type = relational_result_type(op[0], op[1], state, & loc); 1045 1046 /* The relational operators must either generate an error or result 1047 * in a scalar boolean. See page 57 of the GLSL 1.50 spec. 1048 */ 1049 assert(type->is_error() 1050 || ((type->base_type == GLSL_TYPE_BOOL) 1051 && type->is_scalar())); 1052 1053 result = new(ctx) ir_expression(operations[this->oper], type, 1054 op[0], op[1]); 1055 error_emitted = type->is_error(); 1056 break; 1057 1058 case ast_nequal: 1059 case ast_equal: 1060 op[0] = this->subexpressions[0]->hir(instructions, state); 1061 op[1] = this->subexpressions[1]->hir(instructions, state); 1062 1063 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec: 1064 * 1065 * "The equality operators equal (==), and not equal (!=) 1066 * operate on all types. They result in a scalar Boolean. If 1067 * the operand types do not match, then there must be a 1068 * conversion from Section 4.1.10 "Implicit Conversions" 1069 * applied to one operand that can make them match, in which 1070 * case this conversion is done." 1071 */ 1072 if ((!apply_implicit_conversion(op[0]->type, op[1], state) 1073 && !apply_implicit_conversion(op[1]->type, op[0], state)) 1074 || (op[0]->type != op[1]->type)) { 1075 _mesa_glsl_error(& loc, state, "operands of `%s' must have the same " 1076 "type", (this->oper == ast_equal) ? "==" : "!="); 1077 error_emitted = true; 1078 } else if ((state->language_version <= 110) 1079 && (op[0]->type->is_array() || op[1]->type->is_array())) { 1080 _mesa_glsl_error(& loc, state, "array comparisons forbidden in " 1081 "GLSL 1.10"); 1082 error_emitted = true; 1083 } 1084 1085 if (error_emitted) { 1086 result = new(ctx) ir_constant(false); 1087 } else { 1088 result = do_comparison(ctx, operations[this->oper], op[0], op[1]); 1089 assert(result->type == glsl_type::bool_type); 1090 } 1091 break; 1092 1093 case ast_bit_and: 1094 case ast_bit_xor: 1095 case ast_bit_or: 1096 op[0] = this->subexpressions[0]->hir(instructions, state); 1097 op[1] = this->subexpressions[1]->hir(instructions, state); 1098 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper, 1099 state, &loc); 1100 result = new(ctx) ir_expression(operations[this->oper], type, 1101 op[0], op[1]); 1102 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1103 break; 1104 1105 case ast_bit_not: 1106 op[0] = this->subexpressions[0]->hir(instructions, state); 1107 1108 if (state->language_version < 130) { 1109 _mesa_glsl_error(&loc, state, "bit-wise operations require GLSL 1.30"); 1110 error_emitted = true; 1111 } 1112 1113 if (!op[0]->type->is_integer()) { 1114 _mesa_glsl_error(&loc, state, "operand of `~' must be an integer"); 1115 error_emitted = true; 1116 } 1117 1118 type = op[0]->type; 1119 result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL); 1120 break; 1121 1122 case ast_logic_and: { 1123 exec_list rhs_instructions; 1124 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, 1125 "LHS", &error_emitted); 1126 op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1, 1127 "RHS", &error_emitted); 1128 1129 ir_constant *op0_const = op[0]->constant_expression_value(); 1130 if (op0_const) { 1131 if (op0_const->value.b[0]) { 1132 instructions->append_list(&rhs_instructions); 1133 result = op[1]; 1134 } else { 1135 result = op0_const; 1136 } 1137 type = glsl_type::bool_type; 1138 } else { 1139 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type, 1140 "and_tmp", 1141 ir_var_temporary); 1142 instructions->push_tail(tmp); 1143 1144 ir_if *const stmt = new(ctx) ir_if(op[0]); 1145 instructions->push_tail(stmt); 1146 1147 stmt->then_instructions.append_list(&rhs_instructions); 1148 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp); 1149 ir_assignment *const then_assign = 1150 new(ctx) ir_assignment(then_deref, op[1], NULL); 1151 stmt->then_instructions.push_tail(then_assign); 1152 1153 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp); 1154 ir_assignment *const else_assign = 1155 new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false), NULL); 1156 stmt->else_instructions.push_tail(else_assign); 1157 1158 result = new(ctx) ir_dereference_variable(tmp); 1159 type = tmp->type; 1160 } 1161 break; 1162 } 1163 1164 case ast_logic_or: { 1165 exec_list rhs_instructions; 1166 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, 1167 "LHS", &error_emitted); 1168 op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1, 1169 "RHS", &error_emitted); 1170 1171 ir_constant *op0_const = op[0]->constant_expression_value(); 1172 if (op0_const) { 1173 if (op0_const->value.b[0]) { 1174 result = op0_const; 1175 } else { 1176 result = op[1]; 1177 } 1178 type = glsl_type::bool_type; 1179 } else { 1180 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type, 1181 "or_tmp", 1182 ir_var_temporary); 1183 instructions->push_tail(tmp); 1184 1185 ir_if *const stmt = new(ctx) ir_if(op[0]); 1186 instructions->push_tail(stmt); 1187 1188 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp); 1189 ir_assignment *const then_assign = 1190 new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true), NULL); 1191 stmt->then_instructions.push_tail(then_assign); 1192 1193 stmt->else_instructions.append_list(&rhs_instructions); 1194 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp); 1195 ir_assignment *const else_assign = 1196 new(ctx) ir_assignment(else_deref, op[1], NULL); 1197 stmt->else_instructions.push_tail(else_assign); 1198 1199 result = new(ctx) ir_dereference_variable(tmp); 1200 type = tmp->type; 1201 } 1202 break; 1203 } 1204 1205 case ast_logic_xor: 1206 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec: 1207 * 1208 * "The logical binary operators and (&&), or ( | | ), and 1209 * exclusive or (^^). They operate only on two Boolean 1210 * expressions and result in a Boolean expression." 1211 */ 1212 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, "LHS", 1213 &error_emitted); 1214 op[1] = get_scalar_boolean_operand(instructions, state, this, 1, "RHS", 1215 &error_emitted); 1216 1217 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type, 1218 op[0], op[1]); 1219 break; 1220 1221 case ast_logic_not: 1222 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, 1223 "operand", &error_emitted); 1224 1225 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type, 1226 op[0], NULL); 1227 break; 1228 1229 case ast_mul_assign: 1230 case ast_div_assign: 1231 case ast_add_assign: 1232 case ast_sub_assign: { 1233 op[0] = this->subexpressions[0]->hir(instructions, state); 1234 op[1] = this->subexpressions[1]->hir(instructions, state); 1235 1236 type = arithmetic_result_type(op[0], op[1], 1237 (this->oper == ast_mul_assign), 1238 state, & loc); 1239 1240 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1241 op[0], op[1]); 1242 1243 result = do_assignment(instructions, state, 1244 op[0]->clone(ctx, NULL), temp_rhs, false, 1245 this->subexpressions[0]->get_location()); 1246 error_emitted = (op[0]->type->is_error()); 1247 1248 /* GLSL 1.10 does not allow array assignment. However, we don't have to 1249 * explicitly test for this because none of the binary expression 1250 * operators allow array operands either. 1251 */ 1252 1253 break; 1254 } 1255 1256 case ast_mod_assign: { 1257 op[0] = this->subexpressions[0]->hir(instructions, state); 1258 op[1] = this->subexpressions[1]->hir(instructions, state); 1259 1260 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc); 1261 1262 assert(operations[this->oper] == ir_binop_mod); 1263 1264 ir_rvalue *temp_rhs; 1265 temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1266 op[0], op[1]); 1267 1268 result = do_assignment(instructions, state, 1269 op[0]->clone(ctx, NULL), temp_rhs, false, 1270 this->subexpressions[0]->get_location()); 1271 error_emitted = type->is_error(); 1272 break; 1273 } 1274 1275 case ast_ls_assign: 1276 case ast_rs_assign: { 1277 op[0] = this->subexpressions[0]->hir(instructions, state); 1278 op[1] = this->subexpressions[1]->hir(instructions, state); 1279 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state, 1280 &loc); 1281 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], 1282 type, op[0], op[1]); 1283 result = do_assignment(instructions, state, op[0]->clone(ctx, NULL), 1284 temp_rhs, false, 1285 this->subexpressions[0]->get_location()); 1286 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1287 break; 1288 } 1289 1290 case ast_and_assign: 1291 case ast_xor_assign: 1292 case ast_or_assign: { 1293 op[0] = this->subexpressions[0]->hir(instructions, state); 1294 op[1] = this->subexpressions[1]->hir(instructions, state); 1295 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper, 1296 state, &loc); 1297 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], 1298 type, op[0], op[1]); 1299 result = do_assignment(instructions, state, op[0]->clone(ctx, NULL), 1300 temp_rhs, false, 1301 this->subexpressions[0]->get_location()); 1302 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1303 break; 1304 } 1305 1306 case ast_conditional: { 1307 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec: 1308 * 1309 * "The ternary selection operator (?:). It operates on three 1310 * expressions (exp1 ? exp2 : exp3). This operator evaluates the 1311 * first expression, which must result in a scalar Boolean." 1312 */ 1313 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, 1314 "condition", &error_emitted); 1315 1316 /* The :? operator is implemented by generating an anonymous temporary 1317 * followed by an if-statement. The last instruction in each branch of 1318 * the if-statement assigns a value to the anonymous temporary. This 1319 * temporary is the r-value of the expression. 1320 */ 1321 exec_list then_instructions; 1322 exec_list else_instructions; 1323 1324 op[1] = this->subexpressions[1]->hir(&then_instructions, state); 1325 op[2] = this->subexpressions[2]->hir(&else_instructions, state); 1326 1327 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec: 1328 * 1329 * "The second and third expressions can be any type, as 1330 * long their types match, or there is a conversion in 1331 * Section 4.1.10 "Implicit Conversions" that can be applied 1332 * to one of the expressions to make their types match. This 1333 * resulting matching type is the type of the entire 1334 * expression." 1335 */ 1336 if ((!apply_implicit_conversion(op[1]->type, op[2], state) 1337 && !apply_implicit_conversion(op[2]->type, op[1], state)) 1338 || (op[1]->type != op[2]->type)) { 1339 YYLTYPE loc = this->subexpressions[1]->get_location(); 1340 1341 _mesa_glsl_error(& loc, state, "Second and third operands of ?: " 1342 "operator must have matching types."); 1343 error_emitted = true; 1344 type = glsl_type::error_type; 1345 } else { 1346 type = op[1]->type; 1347 } 1348 1349 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec: 1350 * 1351 * "The second and third expressions must be the same type, but can 1352 * be of any type other than an array." 1353 */ 1354 if ((state->language_version <= 110) && type->is_array()) { 1355 _mesa_glsl_error(& loc, state, "Second and third operands of ?: " 1356 "operator must not be arrays."); 1357 error_emitted = true; 1358 } 1359 1360 ir_constant *cond_val = op[0]->constant_expression_value(); 1361 ir_constant *then_val = op[1]->constant_expression_value(); 1362 ir_constant *else_val = op[2]->constant_expression_value(); 1363 1364 if (then_instructions.is_empty() 1365 && else_instructions.is_empty() 1366 && (cond_val != NULL) && (then_val != NULL) && (else_val != NULL)) { 1367 result = (cond_val->value.b[0]) ? then_val : else_val; 1368 } else { 1369 ir_variable *const tmp = 1370 new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary); 1371 instructions->push_tail(tmp); 1372 1373 ir_if *const stmt = new(ctx) ir_if(op[0]); 1374 instructions->push_tail(stmt); 1375 1376 then_instructions.move_nodes_to(& stmt->then_instructions); 1377 ir_dereference *const then_deref = 1378 new(ctx) ir_dereference_variable(tmp); 1379 ir_assignment *const then_assign = 1380 new(ctx) ir_assignment(then_deref, op[1], NULL); 1381 stmt->then_instructions.push_tail(then_assign); 1382 1383 else_instructions.move_nodes_to(& stmt->else_instructions); 1384 ir_dereference *const else_deref = 1385 new(ctx) ir_dereference_variable(tmp); 1386 ir_assignment *const else_assign = 1387 new(ctx) ir_assignment(else_deref, op[2], NULL); 1388 stmt->else_instructions.push_tail(else_assign); 1389 1390 result = new(ctx) ir_dereference_variable(tmp); 1391 } 1392 break; 1393 } 1394 1395 case ast_pre_inc: 1396 case ast_pre_dec: { 1397 op[0] = this->subexpressions[0]->hir(instructions, state); 1398 if (op[0]->type->base_type == GLSL_TYPE_FLOAT) 1399 op[1] = new(ctx) ir_constant(1.0f); 1400 else 1401 op[1] = new(ctx) ir_constant(1); 1402 1403 type = arithmetic_result_type(op[0], op[1], false, state, & loc); 1404 1405 ir_rvalue *temp_rhs; 1406 temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1407 op[0], op[1]); 1408 1409 result = do_assignment(instructions, state, 1410 op[0]->clone(ctx, NULL), temp_rhs, false, 1411 this->subexpressions[0]->get_location()); 1412 error_emitted = op[0]->type->is_error(); 1413 break; 1414 } 1415 1416 case ast_post_inc: 1417 case ast_post_dec: { 1418 op[0] = this->subexpressions[0]->hir(instructions, state); 1419 if (op[0]->type->base_type == GLSL_TYPE_FLOAT) 1420 op[1] = new(ctx) ir_constant(1.0f); 1421 else 1422 op[1] = new(ctx) ir_constant(1); 1423 1424 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1425 1426 type = arithmetic_result_type(op[0], op[1], false, state, & loc); 1427 1428 ir_rvalue *temp_rhs; 1429 temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1430 op[0], op[1]); 1431 1432 /* Get a temporary of a copy of the lvalue before it's modified. 1433 * This may get thrown away later. 1434 */ 1435 result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL)); 1436 1437 (void)do_assignment(instructions, state, 1438 op[0]->clone(ctx, NULL), temp_rhs, false, 1439 this->subexpressions[0]->get_location()); 1440 1441 error_emitted = op[0]->type->is_error(); 1442 break; 1443 } 1444 1445 case ast_field_selection: 1446 result = _mesa_ast_field_selection_to_hir(this, instructions, state); 1447 break; 1448 1449 case ast_array_index: { 1450 YYLTYPE index_loc = subexpressions[1]->get_location(); 1451 1452 op[0] = subexpressions[0]->hir(instructions, state); 1453 op[1] = subexpressions[1]->hir(instructions, state); 1454 1455 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1456 1457 ir_rvalue *const array = op[0]; 1458 1459 result = new(ctx) ir_dereference_array(op[0], op[1]); 1460 1461 /* Do not use op[0] after this point. Use array. 1462 */ 1463 op[0] = NULL; 1464 1465 1466 if (error_emitted) 1467 break; 1468 1469 if (!array->type->is_array() 1470 && !array->type->is_matrix() 1471 && !array->type->is_vector()) { 1472 _mesa_glsl_error(& index_loc, state, 1473 "cannot dereference non-array / non-matrix / " 1474 "non-vector"); 1475 error_emitted = true; 1476 } 1477 1478 if (!op[1]->type->is_integer()) { 1479 _mesa_glsl_error(& index_loc, state, 1480 "array index must be integer type"); 1481 error_emitted = true; 1482 } else if (!op[1]->type->is_scalar()) { 1483 _mesa_glsl_error(& index_loc, state, 1484 "array index must be scalar"); 1485 error_emitted = true; 1486 } 1487 1488 /* If the array index is a constant expression and the array has a 1489 * declared size, ensure that the access is in-bounds. If the array 1490 * index is not a constant expression, ensure that the array has a 1491 * declared size. 1492 */ 1493 ir_constant *const const_index = op[1]->constant_expression_value(); 1494 if (const_index != NULL) { 1495 const int idx = const_index->value.i[0]; 1496 const char *type_name; 1497 unsigned bound = 0; 1498 1499 if (array->type->is_matrix()) { 1500 type_name = "matrix"; 1501 } else if (array->type->is_vector()) { 1502 type_name = "vector"; 1503 } else { 1504 type_name = "array"; 1505 } 1506 1507 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec: 1508 * 1509 * "It is illegal to declare an array with a size, and then 1510 * later (in the same shader) index the same array with an 1511 * integral constant expression greater than or equal to the 1512 * declared size. It is also illegal to index an array with a 1513 * negative constant expression." 1514 */ 1515 if (array->type->is_matrix()) { 1516 if (array->type->row_type()->vector_elements <= idx) { 1517 bound = array->type->row_type()->vector_elements; 1518 } 1519 } else if (array->type->is_vector()) { 1520 if (array->type->vector_elements <= idx) { 1521 bound = array->type->vector_elements; 1522 } 1523 } else { 1524 if ((array->type->array_size() > 0) 1525 && (array->type->array_size() <= idx)) { 1526 bound = array->type->array_size(); 1527 } 1528 } 1529 1530 if (bound > 0) { 1531 _mesa_glsl_error(& loc, state, "%s index must be < %u", 1532 type_name, bound); 1533 error_emitted = true; 1534 } else if (idx < 0) { 1535 _mesa_glsl_error(& loc, state, "%s index must be >= 0", 1536 type_name); 1537 error_emitted = true; 1538 } 1539 1540 if (array->type->is_array()) { 1541 /* If the array is a variable dereference, it dereferences the 1542 * whole array, by definition. Use this to get the variable. 1543 * 1544 * FINISHME: Should some methods for getting / setting / testing 1545 * FINISHME: array access limits be added to ir_dereference? 1546 */ 1547 ir_variable *const v = array->whole_variable_referenced(); 1548 if ((v != NULL) && (unsigned(idx) > v->max_array_access)) 1549 v->max_array_access = idx; 1550 } 1551 } else if (array->type->array_size() == 0) { 1552 _mesa_glsl_error(&loc, state, "unsized array index must be constant"); 1553 } else { 1554 if (array->type->is_array()) { 1555 /* whole_variable_referenced can return NULL if the array is a 1556 * member of a structure. In this case it is safe to not update 1557 * the max_array_access field because it is never used for fields 1558 * of structures. 1559 */ 1560 ir_variable *v = array->whole_variable_referenced(); 1561 if (v != NULL) 1562 v->max_array_access = array->type->array_size() - 1; 1563 } 1564 } 1565 1566 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec: 1567 * 1568 * "Samplers aggregated into arrays within a shader (using square 1569 * brackets [ ]) can only be indexed with integral constant 1570 * expressions [...]." 1571 * 1572 * This restriction was added in GLSL 1.30. Shaders using earlier version 1573 * of the language should not be rejected by the compiler front-end for 1574 * using this construct. This allows useful things such as using a loop 1575 * counter as the index to an array of samplers. If the loop in unrolled, 1576 * the code should compile correctly. Instead, emit a warning. 1577 */ 1578 if (array->type->is_array() && 1579 array->type->element_type()->is_sampler() && 1580 const_index == NULL) { 1581 1582 if (state->language_version == 100) { 1583 _mesa_glsl_warning(&loc, state, 1584 "sampler arrays indexed with non-constant " 1585 "expressions is optional in GLSL ES 1.00"); 1586 } else if (state->language_version < 130) { 1587 _mesa_glsl_warning(&loc, state, 1588 "sampler arrays indexed with non-constant " 1589 "expressions is forbidden in GLSL 1.30 and " 1590 "later"); 1591 } else { 1592 _mesa_glsl_error(&loc, state, 1593 "sampler arrays indexed with non-constant " 1594 "expressions is forbidden in GLSL 1.30 and " 1595 "later"); 1596 error_emitted = true; 1597 } 1598 } 1599 1600 if (error_emitted) 1601 result->type = glsl_type::error_type; 1602 1603 break; 1604 } 1605 1606 case ast_function_call: 1607 /* Should *NEVER* get here. ast_function_call should always be handled 1608 * by ast_function_expression::hir. 1609 */ 1610 assert(0); 1611 break; 1612 1613 case ast_identifier: { 1614 /* ast_identifier can appear several places in a full abstract syntax 1615 * tree. This particular use must be at location specified in the grammar 1616 * as 'variable_identifier'. 1617 */ 1618 ir_variable *var = 1619 state->symbols->get_variable(this->primary_expression.identifier); 1620 1621 result = new(ctx) ir_dereference_variable(var); 1622 1623 if (var != NULL) { 1624 var->used = true; 1625 } else { 1626 _mesa_glsl_error(& loc, state, "`%s' undeclared", 1627 this->primary_expression.identifier); 1628 1629 error_emitted = true; 1630 } 1631 break; 1632 } 1633 1634 case ast_int_constant: 1635 result = new(ctx) ir_constant(this->primary_expression.int_constant); 1636 break; 1637 1638 case ast_uint_constant: 1639 result = new(ctx) ir_constant(this->primary_expression.uint_constant); 1640 break; 1641 1642 case ast_float_constant: 1643 result = new(ctx) ir_constant(this->primary_expression.float_constant); 1644 break; 1645 1646 case ast_bool_constant: 1647 result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant)); 1648 break; 1649 1650 case ast_sequence: { 1651 /* It should not be possible to generate a sequence in the AST without 1652 * any expressions in it. 1653 */ 1654 assert(!this->expressions.is_empty()); 1655 1656 /* The r-value of a sequence is the last expression in the sequence. If 1657 * the other expressions in the sequence do not have side-effects (and 1658 * therefore add instructions to the instruction list), they get dropped 1659 * on the floor. 1660 */ 1661 exec_node *previous_tail_pred = NULL; 1662 YYLTYPE previous_operand_loc = loc; 1663 1664 foreach_list_typed (ast_node, ast, link, &this->expressions) { 1665 /* If one of the operands of comma operator does not generate any 1666 * code, we want to emit a warning. At each pass through the loop 1667 * previous_tail_pred will point to the last instruction in the 1668 * stream *before* processing the previous operand. Naturally, 1669 * instructions->tail_pred will point to the last instruction in the 1670 * stream *after* processing the previous operand. If the two 1671 * pointers match, then the previous operand had no effect. 1672 * 1673 * The warning behavior here differs slightly from GCC. GCC will 1674 * only emit a warning if none of the left-hand operands have an 1675 * effect. However, it will emit a warning for each. I believe that 1676 * there are some cases in C (especially with GCC extensions) where 1677 * it is useful to have an intermediate step in a sequence have no 1678 * effect, but I don't think these cases exist in GLSL. Either way, 1679 * it would be a giant hassle to replicate that behavior. 1680 */ 1681 if (previous_tail_pred == instructions->tail_pred) { 1682 _mesa_glsl_warning(&previous_operand_loc, state, 1683 "left-hand operand of comma expression has " 1684 "no effect"); 1685 } 1686 1687 /* tail_pred is directly accessed instead of using the get_tail() 1688 * method for performance reasons. get_tail() has extra code to 1689 * return NULL when the list is empty. We don't care about that 1690 * here, so using tail_pred directly is fine. 1691 */ 1692 previous_tail_pred = instructions->tail_pred; 1693 previous_operand_loc = ast->get_location(); 1694 1695 result = ast->hir(instructions, state); 1696 } 1697 1698 /* Any errors should have already been emitted in the loop above. 1699 */ 1700 error_emitted = true; 1701 break; 1702 } 1703 } 1704 type = NULL; /* use result->type, not type. */ 1705 assert(result != NULL); 1706 1707 if (result->type->is_error() && !error_emitted) 1708 _mesa_glsl_error(& loc, state, "type mismatch"); 1709 1710 return result; 1711} 1712 1713 1714ir_rvalue * 1715ast_expression_statement::hir(exec_list *instructions, 1716 struct _mesa_glsl_parse_state *state) 1717{ 1718 /* It is possible to have expression statements that don't have an 1719 * expression. This is the solitary semicolon: 1720 * 1721 * for (i = 0; i < 5; i++) 1722 * ; 1723 * 1724 * In this case the expression will be NULL. Test for NULL and don't do 1725 * anything in that case. 1726 */ 1727 if (expression != NULL) 1728 expression->hir(instructions, state); 1729 1730 /* Statements do not have r-values. 1731 */ 1732 return NULL; 1733} 1734 1735 1736ir_rvalue * 1737ast_compound_statement::hir(exec_list *instructions, 1738 struct _mesa_glsl_parse_state *state) 1739{ 1740 if (new_scope) 1741 state->symbols->push_scope(); 1742 1743 foreach_list_typed (ast_node, ast, link, &this->statements) 1744 ast->hir(instructions, state); 1745 1746 if (new_scope) 1747 state->symbols->pop_scope(); 1748 1749 /* Compound statements do not have r-values. 1750 */ 1751 return NULL; 1752} 1753 1754 1755static const glsl_type * 1756process_array_type(YYLTYPE *loc, const glsl_type *base, ast_node *array_size, 1757 struct _mesa_glsl_parse_state *state) 1758{ 1759 unsigned length = 0; 1760 1761 /* FINISHME: Reject delcarations of multidimensional arrays. */ 1762 1763 if (array_size != NULL) { 1764 exec_list dummy_instructions; 1765 ir_rvalue *const ir = array_size->hir(& dummy_instructions, state); 1766 YYLTYPE loc = array_size->get_location(); 1767 1768 /* FINISHME: Verify that the grammar forbids side-effects in array 1769 * FINISHME: sizes. i.e., 'vec4 [x = 12] data' 1770 */ 1771 assert(dummy_instructions.is_empty()); 1772 1773 if (ir != NULL) { 1774 if (!ir->type->is_integer()) { 1775 _mesa_glsl_error(& loc, state, "array size must be integer type"); 1776 } else if (!ir->type->is_scalar()) { 1777 _mesa_glsl_error(& loc, state, "array size must be scalar type"); 1778 } else { 1779 ir_constant *const size = ir->constant_expression_value(); 1780 1781 if (size == NULL) { 1782 _mesa_glsl_error(& loc, state, "array size must be a " 1783 "constant valued expression"); 1784 } else if (size->value.i[0] <= 0) { 1785 _mesa_glsl_error(& loc, state, "array size must be > 0"); 1786 } else { 1787 assert(size->type == ir->type); 1788 length = size->value.u[0]; 1789 } 1790 } 1791 } 1792 } else if (state->es_shader) { 1793 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized 1794 * array declarations have been removed from the language. 1795 */ 1796 _mesa_glsl_error(loc, state, "unsized array declarations are not " 1797 "allowed in GLSL ES 1.00."); 1798 } 1799 1800 return glsl_type::get_array_instance(base, length); 1801} 1802 1803 1804const glsl_type * 1805ast_type_specifier::glsl_type(const char **name, 1806 struct _mesa_glsl_parse_state *state) const 1807{ 1808 const struct glsl_type *type; 1809 1810 type = state->symbols->get_type(this->type_name); 1811 *name = this->type_name; 1812 1813 if (this->is_array) { 1814 YYLTYPE loc = this->get_location(); 1815 type = process_array_type(&loc, type, this->array_size, state); 1816 } 1817 1818 return type; 1819} 1820 1821 1822static void 1823apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual, 1824 ir_variable *var, 1825 struct _mesa_glsl_parse_state *state, 1826 YYLTYPE *loc) 1827{ 1828 if (qual->flags.q.invariant) { 1829 if (var->used) { 1830 _mesa_glsl_error(loc, state, 1831 "variable `%s' may not be redeclared " 1832 "`invariant' after being used", 1833 var->name); 1834 } else { 1835 var->invariant = 1; 1836 } 1837 } 1838 1839 if (qual->flags.q.constant || qual->flags.q.attribute 1840 || qual->flags.q.uniform 1841 || (qual->flags.q.varying && (state->target == fragment_shader))) 1842 var->read_only = 1; 1843 1844 if (qual->flags.q.centroid) 1845 var->centroid = 1; 1846 1847 if (qual->flags.q.attribute && state->target != vertex_shader) { 1848 var->type = glsl_type::error_type; 1849 _mesa_glsl_error(loc, state, 1850 "`attribute' variables may not be declared in the " 1851 "%s shader", 1852 _mesa_glsl_shader_target_name(state->target)); 1853 } 1854 1855 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec: 1856 * 1857 * "The varying qualifier can be used only with the data types 1858 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of 1859 * these." 1860 */ 1861 if (qual->flags.q.varying) { 1862 const glsl_type *non_array_type; 1863 1864 if (var->type && var->type->is_array()) 1865 non_array_type = var->type->fields.array; 1866 else 1867 non_array_type = var->type; 1868 1869 if (non_array_type && non_array_type->base_type != GLSL_TYPE_FLOAT) { 1870 var->type = glsl_type::error_type; 1871 _mesa_glsl_error(loc, state, 1872 "varying variables must be of base type float"); 1873 } 1874 } 1875 1876 /* If there is no qualifier that changes the mode of the variable, leave 1877 * the setting alone. 1878 */ 1879 if (qual->flags.q.in && qual->flags.q.out) 1880 var->mode = ir_var_inout; 1881 else if (qual->flags.q.attribute || qual->flags.q.in 1882 || (qual->flags.q.varying && (state->target == fragment_shader))) 1883 var->mode = ir_var_in; 1884 else if (qual->flags.q.out 1885 || (qual->flags.q.varying && (state->target == vertex_shader))) 1886 var->mode = ir_var_out; 1887 else if (qual->flags.q.uniform) 1888 var->mode = ir_var_uniform; 1889 1890 if (state->all_invariant && (state->current_function == NULL)) { 1891 switch (state->target) { 1892 case vertex_shader: 1893 if (var->mode == ir_var_out) 1894 var->invariant = true; 1895 break; 1896 case geometry_shader: 1897 if ((var->mode == ir_var_in) || (var->mode == ir_var_out)) 1898 var->invariant = true; 1899 break; 1900 case fragment_shader: 1901 if (var->mode == ir_var_in) 1902 var->invariant = true; 1903 break; 1904 } 1905 } 1906 1907 if (qual->flags.q.flat) 1908 var->interpolation = ir_var_flat; 1909 else if (qual->flags.q.noperspective) 1910 var->interpolation = ir_var_noperspective; 1911 else 1912 var->interpolation = ir_var_smooth; 1913 1914 var->pixel_center_integer = qual->flags.q.pixel_center_integer; 1915 var->origin_upper_left = qual->flags.q.origin_upper_left; 1916 if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer) 1917 && (strcmp(var->name, "gl_FragCoord") != 0)) { 1918 const char *const qual_string = (qual->flags.q.origin_upper_left) 1919 ? "origin_upper_left" : "pixel_center_integer"; 1920 1921 _mesa_glsl_error(loc, state, 1922 "layout qualifier `%s' can only be applied to " 1923 "fragment shader input `gl_FragCoord'", 1924 qual_string); 1925 } 1926 1927 if (qual->flags.q.explicit_location) { 1928 const bool global_scope = (state->current_function == NULL); 1929 bool fail = false; 1930 const char *string = ""; 1931 1932 /* In the vertex shader only shader inputs can be given explicit 1933 * locations. 1934 * 1935 * In the fragment shader only shader outputs can be given explicit 1936 * locations. 1937 */ 1938 switch (state->target) { 1939 case vertex_shader: 1940 if (!global_scope || (var->mode != ir_var_in)) { 1941 fail = true; 1942 string = "input"; 1943 } 1944 break; 1945 1946 case geometry_shader: 1947 _mesa_glsl_error(loc, state, 1948 "geometry shader variables cannot be given " 1949 "explicit locations\n"); 1950 break; 1951 1952 case fragment_shader: 1953 if (!global_scope || (var->mode != ir_var_out)) { 1954 fail = true; 1955 string = "output"; 1956 } 1957 break; 1958 }; 1959 1960 if (fail) { 1961 _mesa_glsl_error(loc, state, 1962 "only %s shader %s variables can be given an " 1963 "explicit location\n", 1964 _mesa_glsl_shader_target_name(state->target), 1965 string); 1966 } else { 1967 var->explicit_location = true; 1968 1969 /* This bit of silliness is needed because invalid explicit locations 1970 * are supposed to be flagged during linking. Small negative values 1971 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias 1972 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS). 1973 * The linker needs to be able to differentiate these cases. This 1974 * ensures that negative values stay negative. 1975 */ 1976 if (qual->location >= 0) { 1977 var->location = (state->target == vertex_shader) 1978 ? (qual->location + VERT_ATTRIB_GENERIC0) 1979 : (qual->location + FRAG_RESULT_DATA0); 1980 } else { 1981 var->location = qual->location; 1982 } 1983 } 1984 } 1985 1986 /* Does the declaration use the 'layout' keyword? 1987 */ 1988 const bool uses_layout = qual->flags.q.pixel_center_integer 1989 || qual->flags.q.origin_upper_left 1990 || qual->flags.q.explicit_location; 1991 1992 /* Does the declaration use the deprecated 'attribute' or 'varying' 1993 * keywords? 1994 */ 1995 const bool uses_deprecated_qualifier = qual->flags.q.attribute 1996 || qual->flags.q.varying; 1997 1998 /* Is the 'layout' keyword used with parameters that allow relaxed checking. 1999 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some 2000 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable 2001 * allowed the layout qualifier to be used with 'varying' and 'attribute'. 2002 * These extensions and all following extensions that add the 'layout' 2003 * keyword have been modified to require the use of 'in' or 'out'. 2004 * 2005 * The following extension do not allow the deprecated keywords: 2006 * 2007 * GL_AMD_conservative_depth 2008 * GL_ARB_gpu_shader5 2009 * GL_ARB_separate_shader_objects 2010 * GL_ARB_tesselation_shader 2011 * GL_ARB_transform_feedback3 2012 * GL_ARB_uniform_buffer_object 2013 * 2014 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5 2015 * allow layout with the deprecated keywords. 2016 */ 2017 const bool relaxed_layout_qualifier_checking = 2018 state->ARB_fragment_coord_conventions_enable; 2019 2020 if (uses_layout && uses_deprecated_qualifier) { 2021 if (relaxed_layout_qualifier_checking) { 2022 _mesa_glsl_warning(loc, state, 2023 "`layout' qualifier may not be used with " 2024 "`attribute' or `varying'"); 2025 } else { 2026 _mesa_glsl_error(loc, state, 2027 "`layout' qualifier may not be used with " 2028 "`attribute' or `varying'"); 2029 } 2030 } 2031 2032 /* Layout qualifiers for gl_FragDepth, which are enabled by extension 2033 * AMD_conservative_depth. 2034 */ 2035 int depth_layout_count = qual->flags.q.depth_any 2036 + qual->flags.q.depth_greater 2037 + qual->flags.q.depth_less 2038 + qual->flags.q.depth_unchanged; 2039 if (depth_layout_count > 0 2040 && !state->AMD_conservative_depth_enable) { 2041 _mesa_glsl_error(loc, state, 2042 "extension GL_AMD_conservative_depth must be enabled " 2043 "to use depth layout qualifiers"); 2044 } else if (depth_layout_count > 0 2045 && strcmp(var->name, "gl_FragDepth") != 0) { 2046 _mesa_glsl_error(loc, state, 2047 "depth layout qualifiers can be applied only to " 2048 "gl_FragDepth"); 2049 } else if (depth_layout_count > 1 2050 && strcmp(var->name, "gl_FragDepth") == 0) { 2051 _mesa_glsl_error(loc, state, 2052 "at most one depth layout qualifier can be applied to " 2053 "gl_FragDepth"); 2054 } 2055 if (qual->flags.q.depth_any) 2056 var->depth_layout = ir_depth_layout_any; 2057 else if (qual->flags.q.depth_greater) 2058 var->depth_layout = ir_depth_layout_greater; 2059 else if (qual->flags.q.depth_less) 2060 var->depth_layout = ir_depth_layout_less; 2061 else if (qual->flags.q.depth_unchanged) 2062 var->depth_layout = ir_depth_layout_unchanged; 2063 else 2064 var->depth_layout = ir_depth_layout_none; 2065 2066 if (var->type->is_array() && state->language_version != 110) { 2067 var->array_lvalue = true; 2068 } 2069} 2070 2071/** 2072 * Get the variable that is being redeclared by this declaration 2073 * 2074 * Semantic checks to verify the validity of the redeclaration are also 2075 * performed. If semantic checks fail, compilation error will be emitted via 2076 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned. 2077 * 2078 * \returns 2079 * A pointer to an existing variable in the current scope if the declaration 2080 * is a redeclaration, \c NULL otherwise. 2081 */ 2082ir_variable * 2083get_variable_being_redeclared(ir_variable *var, ast_declaration *decl, 2084 struct _mesa_glsl_parse_state *state) 2085{ 2086 /* Check if this declaration is actually a re-declaration, either to 2087 * resize an array or add qualifiers to an existing variable. 2088 * 2089 * This is allowed for variables in the current scope, or when at 2090 * global scope (for built-ins in the implicit outer scope). 2091 */ 2092 ir_variable *earlier = state->symbols->get_variable(decl->identifier); 2093 if (earlier == NULL || 2094 (state->current_function != NULL && 2095 !state->symbols->name_declared_this_scope(decl->identifier))) { 2096 return NULL; 2097 } 2098 2099 2100 YYLTYPE loc = decl->get_location(); 2101 2102 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec, 2103 * 2104 * "It is legal to declare an array without a size and then 2105 * later re-declare the same name as an array of the same 2106 * type and specify a size." 2107 */ 2108 if ((earlier->type->array_size() == 0) 2109 && var->type->is_array() 2110 && (var->type->element_type() == earlier->type->element_type())) { 2111 /* FINISHME: This doesn't match the qualifiers on the two 2112 * FINISHME: declarations. It's not 100% clear whether this is 2113 * FINISHME: required or not. 2114 */ 2115 2116 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec: 2117 * 2118 * "The size [of gl_TexCoord] can be at most 2119 * gl_MaxTextureCoords." 2120 */ 2121 const unsigned size = unsigned(var->type->array_size()); 2122 if ((strcmp("gl_TexCoord", var->name) == 0) 2123 && (size > state->Const.MaxTextureCoords)) { 2124 _mesa_glsl_error(& loc, state, "`gl_TexCoord' array size cannot " 2125 "be larger than gl_MaxTextureCoords (%u)\n", 2126 state->Const.MaxTextureCoords); 2127 } else if ((size > 0) && (size <= earlier->max_array_access)) { 2128 _mesa_glsl_error(& loc, state, "array size must be > %u due to " 2129 "previous access", 2130 earlier->max_array_access); 2131 } 2132 2133 earlier->type = var->type; 2134 delete var; 2135 var = NULL; 2136 } else if (state->ARB_fragment_coord_conventions_enable 2137 && strcmp(var->name, "gl_FragCoord") == 0 2138 && earlier->type == var->type 2139 && earlier->mode == var->mode) { 2140 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout 2141 * qualifiers. 2142 */ 2143 earlier->origin_upper_left = var->origin_upper_left; 2144 earlier->pixel_center_integer = var->pixel_center_integer; 2145 2146 /* According to section 4.3.7 of the GLSL 1.30 spec, 2147 * the following built-in varaibles can be redeclared with an 2148 * interpolation qualifier: 2149 * * gl_FrontColor 2150 * * gl_BackColor 2151 * * gl_FrontSecondaryColor 2152 * * gl_BackSecondaryColor 2153 * * gl_Color 2154 * * gl_SecondaryColor 2155 */ 2156 } else if (state->language_version >= 130 2157 && (strcmp(var->name, "gl_FrontColor") == 0 2158 || strcmp(var->name, "gl_BackColor") == 0 2159 || strcmp(var->name, "gl_FrontSecondaryColor") == 0 2160 || strcmp(var->name, "gl_BackSecondaryColor") == 0 2161 || strcmp(var->name, "gl_Color") == 0 2162 || strcmp(var->name, "gl_SecondaryColor") == 0) 2163 && earlier->type == var->type 2164 && earlier->mode == var->mode) { 2165 earlier->interpolation = var->interpolation; 2166 2167 /* Layout qualifiers for gl_FragDepth. */ 2168 } else if (state->AMD_conservative_depth_enable 2169 && strcmp(var->name, "gl_FragDepth") == 0 2170 && earlier->type == var->type 2171 && earlier->mode == var->mode) { 2172 2173 /** From the AMD_conservative_depth spec: 2174 * Within any shader, the first redeclarations of gl_FragDepth 2175 * must appear before any use of gl_FragDepth. 2176 */ 2177 if (earlier->used) { 2178 _mesa_glsl_error(&loc, state, 2179 "the first redeclaration of gl_FragDepth " 2180 "must appear before any use of gl_FragDepth"); 2181 } 2182 2183 /* Prevent inconsistent redeclaration of depth layout qualifier. */ 2184 if (earlier->depth_layout != ir_depth_layout_none 2185 && earlier->depth_layout != var->depth_layout) { 2186 _mesa_glsl_error(&loc, state, 2187 "gl_FragDepth: depth layout is declared here " 2188 "as '%s, but it was previously declared as " 2189 "'%s'", 2190 depth_layout_string(var->depth_layout), 2191 depth_layout_string(earlier->depth_layout)); 2192 } 2193 2194 earlier->depth_layout = var->depth_layout; 2195 2196 } else { 2197 _mesa_glsl_error(&loc, state, "`%s' redeclared", decl->identifier); 2198 } 2199 2200 return earlier; 2201} 2202 2203/** 2204 * Generate the IR for an initializer in a variable declaration 2205 */ 2206ir_rvalue * 2207process_initializer(ir_variable *var, ast_declaration *decl, 2208 ast_fully_specified_type *type, 2209 exec_list *initializer_instructions, 2210 struct _mesa_glsl_parse_state *state) 2211{ 2212 ir_rvalue *result = NULL; 2213 2214 YYLTYPE initializer_loc = decl->initializer->get_location(); 2215 2216 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec: 2217 * 2218 * "All uniform variables are read-only and are initialized either 2219 * directly by an application via API commands, or indirectly by 2220 * OpenGL." 2221 */ 2222 if ((state->language_version <= 110) 2223 && (var->mode == ir_var_uniform)) { 2224 _mesa_glsl_error(& initializer_loc, state, 2225 "cannot initialize uniforms in GLSL 1.10"); 2226 } 2227 2228 if (var->type->is_sampler()) { 2229 _mesa_glsl_error(& initializer_loc, state, 2230 "cannot initialize samplers"); 2231 } 2232 2233 if ((var->mode == ir_var_in) && (state->current_function == NULL)) { 2234 _mesa_glsl_error(& initializer_loc, state, 2235 "cannot initialize %s shader input / %s", 2236 _mesa_glsl_shader_target_name(state->target), 2237 (state->target == vertex_shader) 2238 ? "attribute" : "varying"); 2239 } 2240 2241 ir_dereference *const lhs = new(state) ir_dereference_variable(var); 2242 ir_rvalue *rhs = decl->initializer->hir(initializer_instructions, 2243 state); 2244 2245 /* Calculate the constant value if this is a const or uniform 2246 * declaration. 2247 */ 2248 if (type->qualifier.flags.q.constant 2249 || type->qualifier.flags.q.uniform) { 2250 ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs, true); 2251 if (new_rhs != NULL) { 2252 rhs = new_rhs; 2253 2254 ir_constant *constant_value = rhs->constant_expression_value(); 2255 if (!constant_value) { 2256 _mesa_glsl_error(& initializer_loc, state, 2257 "initializer of %s variable `%s' must be a " 2258 "constant expression", 2259 (type->qualifier.flags.q.constant) 2260 ? "const" : "uniform", 2261 decl->identifier); 2262 if (var->type->is_numeric()) { 2263 /* Reduce cascading errors. */ 2264 var->constant_value = ir_constant::zero(state, var->type); 2265 } 2266 } else { 2267 rhs = constant_value; 2268 var->constant_value = constant_value; 2269 } 2270 } else { 2271 _mesa_glsl_error(&initializer_loc, state, 2272 "initializer of type %s cannot be assigned to " 2273 "variable of type %s", 2274 rhs->type->name, var->type->name); 2275 if (var->type->is_numeric()) { 2276 /* Reduce cascading errors. */ 2277 var->constant_value = ir_constant::zero(state, var->type); 2278 } 2279 } 2280 } 2281 2282 if (rhs && !rhs->type->is_error()) { 2283 bool temp = var->read_only; 2284 if (type->qualifier.flags.q.constant) 2285 var->read_only = false; 2286 2287 /* Never emit code to initialize a uniform. 2288 */ 2289 const glsl_type *initializer_type; 2290 if (!type->qualifier.flags.q.uniform) { 2291 result = do_assignment(initializer_instructions, state, 2292 lhs, rhs, true, 2293 type->get_location()); 2294 initializer_type = result->type; 2295 } else 2296 initializer_type = rhs->type; 2297 2298 /* If the declared variable is an unsized array, it must inherrit 2299 * its full type from the initializer. A declaration such as 2300 * 2301 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0); 2302 * 2303 * becomes 2304 * 2305 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0); 2306 * 2307 * The assignment generated in the if-statement (below) will also 2308 * automatically handle this case for non-uniforms. 2309 * 2310 * If the declared variable is not an array, the types must 2311 * already match exactly. As a result, the type assignment 2312 * here can be done unconditionally. For non-uniforms the call 2313 * to do_assignment can change the type of the initializer (via 2314 * the implicit conversion rules). For uniforms the initializer 2315 * must be a constant expression, and the type of that expression 2316 * was validated above. 2317 */ 2318 var->type = initializer_type; 2319 2320 var->read_only = temp; 2321 } 2322 2323 return result; 2324} 2325 2326ir_rvalue * 2327ast_declarator_list::hir(exec_list *instructions, 2328 struct _mesa_glsl_parse_state *state) 2329{ 2330 void *ctx = state; 2331 const struct glsl_type *decl_type; 2332 const char *type_name = NULL; 2333 ir_rvalue *result = NULL; 2334 YYLTYPE loc = this->get_location(); 2335 2336 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec: 2337 * 2338 * "To ensure that a particular output variable is invariant, it is 2339 * necessary to use the invariant qualifier. It can either be used to 2340 * qualify a previously declared variable as being invariant 2341 * 2342 * invariant gl_Position; // make existing gl_Position be invariant" 2343 * 2344 * In these cases the parser will set the 'invariant' flag in the declarator 2345 * list, and the type will be NULL. 2346 */ 2347 if (this->invariant) { 2348 assert(this->type == NULL); 2349 2350 if (state->current_function != NULL) { 2351 _mesa_glsl_error(& loc, state, 2352 "All uses of `invariant' keyword must be at global " 2353 "scope\n"); 2354 } 2355 2356 foreach_list_typed (ast_declaration, decl, link, &this->declarations) { 2357 assert(!decl->is_array); 2358 assert(decl->array_size == NULL); 2359 assert(decl->initializer == NULL); 2360 2361 ir_variable *const earlier = 2362 state->symbols->get_variable(decl->identifier); 2363 if (earlier == NULL) { 2364 _mesa_glsl_error(& loc, state, 2365 "Undeclared variable `%s' cannot be marked " 2366 "invariant\n", decl->identifier); 2367 } else if ((state->target == vertex_shader) 2368 && (earlier->mode != ir_var_out)) { 2369 _mesa_glsl_error(& loc, state, 2370 "`%s' cannot be marked invariant, vertex shader " 2371 "outputs only\n", decl->identifier); 2372 } else if ((state->target == fragment_shader) 2373 && (earlier->mode != ir_var_in)) { 2374 _mesa_glsl_error(& loc, state, 2375 "`%s' cannot be marked invariant, fragment shader " 2376 "inputs only\n", decl->identifier); 2377 } else if (earlier->used) { 2378 _mesa_glsl_error(& loc, state, 2379 "variable `%s' may not be redeclared " 2380 "`invariant' after being used", 2381 earlier->name); 2382 } else { 2383 earlier->invariant = true; 2384 } 2385 } 2386 2387 /* Invariant redeclarations do not have r-values. 2388 */ 2389 return NULL; 2390 } 2391 2392 assert(this->type != NULL); 2393 assert(!this->invariant); 2394 2395 /* The type specifier may contain a structure definition. Process that 2396 * before any of the variable declarations. 2397 */ 2398 (void) this->type->specifier->hir(instructions, state); 2399 2400 decl_type = this->type->specifier->glsl_type(& type_name, state); 2401 if (this->declarations.is_empty()) { 2402 /* The only valid case where the declaration list can be empty is when 2403 * the declaration is setting the default precision of a built-in type 2404 * (e.g., 'precision highp vec4;'). 2405 */ 2406 2407 if (decl_type != NULL) { 2408 } else { 2409 _mesa_glsl_error(& loc, state, "incomplete declaration"); 2410 } 2411 } 2412 2413 foreach_list_typed (ast_declaration, decl, link, &this->declarations) { 2414 const struct glsl_type *var_type; 2415 ir_variable *var; 2416 2417 /* FINISHME: Emit a warning if a variable declaration shadows a 2418 * FINISHME: declaration at a higher scope. 2419 */ 2420 2421 if ((decl_type == NULL) || decl_type->is_void()) { 2422 if (type_name != NULL) { 2423 _mesa_glsl_error(& loc, state, 2424 "invalid type `%s' in declaration of `%s'", 2425 type_name, decl->identifier); 2426 } else { 2427 _mesa_glsl_error(& loc, state, 2428 "invalid type in declaration of `%s'", 2429 decl->identifier); 2430 } 2431 continue; 2432 } 2433 2434 if (decl->is_array) { 2435 var_type = process_array_type(&loc, decl_type, decl->array_size, 2436 state); 2437 } else { 2438 var_type = decl_type; 2439 } 2440 2441 var = new(ctx) ir_variable(var_type, decl->identifier, ir_var_auto); 2442 2443 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification; 2444 * 2445 * "Global variables can only use the qualifiers const, 2446 * attribute, uni form, or varying. Only one may be 2447 * specified. 2448 * 2449 * Local variables can only use the qualifier const." 2450 * 2451 * This is relaxed in GLSL 1.30. It is also relaxed by any extension 2452 * that adds the 'layout' keyword. 2453 */ 2454 if ((state->language_version < 130) 2455 && !state->ARB_explicit_attrib_location_enable 2456 && !state->ARB_fragment_coord_conventions_enable) { 2457 if (this->type->qualifier.flags.q.out) { 2458 _mesa_glsl_error(& loc, state, 2459 "`out' qualifier in declaration of `%s' " 2460 "only valid for function parameters in %s.", 2461 decl->identifier, state->version_string); 2462 } 2463 if (this->type->qualifier.flags.q.in) { 2464 _mesa_glsl_error(& loc, state, 2465 "`in' qualifier in declaration of `%s' " 2466 "only valid for function parameters in %s.", 2467 decl->identifier, state->version_string); 2468 } 2469 /* FINISHME: Test for other invalid qualifiers. */ 2470 } 2471 2472 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, 2473 & loc); 2474 2475 if (this->type->qualifier.flags.q.invariant) { 2476 if ((state->target == vertex_shader) && !(var->mode == ir_var_out || 2477 var->mode == ir_var_inout)) { 2478 /* FINISHME: Note that this doesn't work for invariant on 2479 * a function signature outval 2480 */ 2481 _mesa_glsl_error(& loc, state, 2482 "`%s' cannot be marked invariant, vertex shader " 2483 "outputs only\n", var->name); 2484 } else if ((state->target == fragment_shader) && 2485 !(var->mode == ir_var_in || var->mode == ir_var_inout)) { 2486 /* FINISHME: Note that this doesn't work for invariant on 2487 * a function signature inval 2488 */ 2489 _mesa_glsl_error(& loc, state, 2490 "`%s' cannot be marked invariant, fragment shader " 2491 "inputs only\n", var->name); 2492 } 2493 } 2494 2495 if (state->current_function != NULL) { 2496 const char *mode = NULL; 2497 const char *extra = ""; 2498 2499 /* There is no need to check for 'inout' here because the parser will 2500 * only allow that in function parameter lists. 2501 */ 2502 if (this->type->qualifier.flags.q.attribute) { 2503 mode = "attribute"; 2504 } else if (this->type->qualifier.flags.q.uniform) { 2505 mode = "uniform"; 2506 } else if (this->type->qualifier.flags.q.varying) { 2507 mode = "varying"; 2508 } else if (this->type->qualifier.flags.q.in) { 2509 mode = "in"; 2510 extra = " or in function parameter list"; 2511 } else if (this->type->qualifier.flags.q.out) { 2512 mode = "out"; 2513 extra = " or in function parameter list"; 2514 } 2515 2516 if (mode) { 2517 _mesa_glsl_error(& loc, state, 2518 "%s variable `%s' must be declared at " 2519 "global scope%s", 2520 mode, var->name, extra); 2521 } 2522 } else if (var->mode == ir_var_in) { 2523 var->read_only = true; 2524 2525 if (state->target == vertex_shader) { 2526 bool error_emitted = false; 2527 2528 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec: 2529 * 2530 * "Vertex shader inputs can only be float, floating-point 2531 * vectors, matrices, signed and unsigned integers and integer 2532 * vectors. Vertex shader inputs can also form arrays of these 2533 * types, but not structures." 2534 * 2535 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec: 2536 * 2537 * "Vertex shader inputs can only be float, floating-point 2538 * vectors, matrices, signed and unsigned integers and integer 2539 * vectors. They cannot be arrays or structures." 2540 * 2541 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec: 2542 * 2543 * "The attribute qualifier can be used only with float, 2544 * floating-point vectors, and matrices. Attribute variables 2545 * cannot be declared as arrays or structures." 2546 */ 2547 const glsl_type *check_type = var->type->is_array() 2548 ? var->type->fields.array : var->type; 2549 2550 switch (check_type->base_type) { 2551 case GLSL_TYPE_FLOAT: 2552 break; 2553 case GLSL_TYPE_UINT: 2554 case GLSL_TYPE_INT: 2555 if (state->language_version > 120) 2556 break; 2557 /* FALLTHROUGH */ 2558 default: 2559 _mesa_glsl_error(& loc, state, 2560 "vertex shader input / attribute cannot have " 2561 "type %s`%s'", 2562 var->type->is_array() ? "array of " : "", 2563 check_type->name); 2564 error_emitted = true; 2565 } 2566 2567 if (!error_emitted && (state->language_version <= 130) 2568 && var->type->is_array()) { 2569 _mesa_glsl_error(& loc, state, 2570 "vertex shader input / attribute cannot have " 2571 "array type"); 2572 error_emitted = true; 2573 } 2574 } 2575 } 2576 2577 /* Integer vertex outputs must be qualified with 'flat'. 2578 * 2579 * From section 4.3.6 of the GLSL 1.30 spec: 2580 * "If a vertex output is a signed or unsigned integer or integer 2581 * vector, then it must be qualified with the interpolation qualifier 2582 * flat." 2583 */ 2584 if (state->language_version >= 130 2585 && state->target == vertex_shader 2586 && state->current_function == NULL 2587 && var->type->is_integer() 2588 && var->mode == ir_var_out 2589 && var->interpolation != ir_var_flat) { 2590 2591 _mesa_glsl_error(&loc, state, "If a vertex output is an integer, " 2592 "then it must be qualified with 'flat'"); 2593 } 2594 2595 2596 /* Interpolation qualifiers cannot be applied to 'centroid' and 2597 * 'centroid varying'. 2598 * 2599 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec: 2600 * "interpolation qualifiers may only precede the qualifiers in, 2601 * centroid in, out, or centroid out in a declaration. They do not apply 2602 * to the deprecated storage qualifiers varying or centroid varying." 2603 */ 2604 if (state->language_version >= 130 2605 && this->type->qualifier.has_interpolation() 2606 && this->type->qualifier.flags.q.varying) { 2607 2608 const char *i = this->type->qualifier.interpolation_string(); 2609 assert(i != NULL); 2610 const char *s; 2611 if (this->type->qualifier.flags.q.centroid) 2612 s = "centroid varying"; 2613 else 2614 s = "varying"; 2615 2616 _mesa_glsl_error(&loc, state, 2617 "qualifier '%s' cannot be applied to the " 2618 "deprecated storage qualifier '%s'", i, s); 2619 } 2620 2621 2622 /* Interpolation qualifiers can only apply to vertex shader outputs and 2623 * fragment shader inputs. 2624 * 2625 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec: 2626 * "Outputs from a vertex shader (out) and inputs to a fragment 2627 * shader (in) can be further qualified with one or more of these 2628 * interpolation qualifiers" 2629 */ 2630 if (state->language_version >= 130 2631 && this->type->qualifier.has_interpolation()) { 2632 2633 const char *i = this->type->qualifier.interpolation_string(); 2634 assert(i != NULL); 2635 2636 switch (state->target) { 2637 case vertex_shader: 2638 if (this->type->qualifier.flags.q.in) { 2639 _mesa_glsl_error(&loc, state, 2640 "qualifier '%s' cannot be applied to vertex " 2641 "shader inputs", i); 2642 } 2643 break; 2644 case fragment_shader: 2645 if (this->type->qualifier.flags.q.out) { 2646 _mesa_glsl_error(&loc, state, 2647 "qualifier '%s' cannot be applied to fragment " 2648 "shader outputs", i); 2649 } 2650 break; 2651 default: 2652 assert(0); 2653 } 2654 } 2655 2656 2657 /* From section 4.3.4 of the GLSL 1.30 spec: 2658 * "It is an error to use centroid in in a vertex shader." 2659 */ 2660 if (state->language_version >= 130 2661 && this->type->qualifier.flags.q.centroid 2662 && this->type->qualifier.flags.q.in 2663 && state->target == vertex_shader) { 2664 2665 _mesa_glsl_error(&loc, state, 2666 "'centroid in' cannot be used in a vertex shader"); 2667 } 2668 2669 2670 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30. 2671 */ 2672 if (this->type->specifier->precision != ast_precision_none 2673 && state->language_version != 100 2674 && state->language_version < 130) { 2675 2676 _mesa_glsl_error(&loc, state, 2677 "precision qualifiers are supported only in GLSL ES " 2678 "1.00, and GLSL 1.30 and later"); 2679 } 2680 2681 2682 /* Precision qualifiers only apply to floating point and integer types. 2683 * 2684 * From section 4.5.2 of the GLSL 1.30 spec: 2685 * "Any floating point or any integer declaration can have the type 2686 * preceded by one of these precision qualifiers [...] Literal 2687 * constants do not have precision qualifiers. Neither do Boolean 2688 * variables. 2689 * 2690 * In GLSL ES, sampler types are also allowed. 2691 * 2692 * From page 87 of the GLSL ES spec: 2693 * "RESOLUTION: Allow sampler types to take a precision qualifier." 2694 */ 2695 if (this->type->specifier->precision != ast_precision_none 2696 && !var->type->is_float() 2697 && !var->type->is_integer() 2698 && !(var->type->is_sampler() && state->es_shader) 2699 && !(var->type->is_array() 2700 && (var->type->fields.array->is_float() 2701 || var->type->fields.array->is_integer()))) { 2702 2703 _mesa_glsl_error(&loc, state, 2704 "precision qualifiers apply only to floating point" 2705 "%s types", state->es_shader ? ", integer, and sampler" 2706 : "and integer"); 2707 } 2708 2709 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec: 2710 * 2711 * "[Sampler types] can only be declared as function 2712 * parameters or uniform variables (see Section 4.3.5 2713 * "Uniform")". 2714 */ 2715 if (var_type->contains_sampler() && 2716 !this->type->qualifier.flags.q.uniform) { 2717 _mesa_glsl_error(&loc, state, "samplers must be declared uniform"); 2718 } 2719 2720 /* Process the initializer and add its instructions to a temporary 2721 * list. This list will be added to the instruction stream (below) after 2722 * the declaration is added. This is done because in some cases (such as 2723 * redeclarations) the declaration may not actually be added to the 2724 * instruction stream. 2725 */ 2726 exec_list initializer_instructions; 2727 ir_variable *earlier = get_variable_being_redeclared(var, decl, state); 2728 2729 if (decl->initializer != NULL) { 2730 result = process_initializer((earlier == NULL) ? var : earlier, 2731 decl, this->type, 2732 &initializer_instructions, state); 2733 } 2734 2735 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec: 2736 * 2737 * "It is an error to write to a const variable outside of 2738 * its declaration, so they must be initialized when 2739 * declared." 2740 */ 2741 if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) { 2742 _mesa_glsl_error(& loc, state, 2743 "const declaration of `%s' must be initialized", 2744 decl->identifier); 2745 } 2746 2747 /* If the declaration is not a redeclaration, there are a few additional 2748 * semantic checks that must be applied. In addition, variable that was 2749 * created for the declaration should be added to the IR stream. 2750 */ 2751 if (earlier == NULL) { 2752 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec, 2753 * 2754 * "Identifiers starting with "gl_" are reserved for use by 2755 * OpenGL, and may not be declared in a shader as either a 2756 * variable or a function." 2757 */ 2758 if (strncmp(decl->identifier, "gl_", 3) == 0) 2759 _mesa_glsl_error(& loc, state, 2760 "identifier `%s' uses reserved `gl_' prefix", 2761 decl->identifier); 2762 2763 /* Add the variable to the symbol table. Note that the initializer's 2764 * IR was already processed earlier (though it hasn't been emitted 2765 * yet), without the variable in scope. 2766 * 2767 * This differs from most C-like languages, but it follows the GLSL 2768 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50 2769 * spec: 2770 * 2771 * "Within a declaration, the scope of a name starts immediately 2772 * after the initializer if present or immediately after the name 2773 * being declared if not." 2774 */ 2775 if (!state->symbols->add_variable(var)) { 2776 YYLTYPE loc = this->get_location(); 2777 _mesa_glsl_error(&loc, state, "name `%s' already taken in the " 2778 "current scope", decl->identifier); 2779 continue; 2780 } 2781 2782 /* Push the variable declaration to the top. It means that all the 2783 * variable declarations will appear in a funny last-to-first order, 2784 * but otherwise we run into trouble if a function is prototyped, a 2785 * global var is decled, then the function is defined with usage of 2786 * the global var. See glslparsertest's CorrectModule.frag. 2787 */ 2788 instructions->push_head(var); 2789 } 2790 2791 instructions->append_list(&initializer_instructions); 2792 } 2793 2794 2795 /* Generally, variable declarations do not have r-values. However, 2796 * one is used for the declaration in 2797 * 2798 * while (bool b = some_condition()) { 2799 * ... 2800 * } 2801 * 2802 * so we return the rvalue from the last seen declaration here. 2803 */ 2804 return result; 2805} 2806 2807 2808ir_rvalue * 2809ast_parameter_declarator::hir(exec_list *instructions, 2810 struct _mesa_glsl_parse_state *state) 2811{ 2812 void *ctx = state; 2813 const struct glsl_type *type; 2814 const char *name = NULL; 2815 YYLTYPE loc = this->get_location(); 2816 2817 type = this->type->specifier->glsl_type(& name, state); 2818 2819 if (type == NULL) { 2820 if (name != NULL) { 2821 _mesa_glsl_error(& loc, state, 2822 "invalid type `%s' in declaration of `%s'", 2823 name, this->identifier); 2824 } else { 2825 _mesa_glsl_error(& loc, state, 2826 "invalid type in declaration of `%s'", 2827 this->identifier); 2828 } 2829 2830 type = glsl_type::error_type; 2831 } 2832 2833 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec: 2834 * 2835 * "Functions that accept no input arguments need not use void in the 2836 * argument list because prototypes (or definitions) are required and 2837 * therefore there is no ambiguity when an empty argument list "( )" is 2838 * declared. The idiom "(void)" as a parameter list is provided for 2839 * convenience." 2840 * 2841 * Placing this check here prevents a void parameter being set up 2842 * for a function, which avoids tripping up checks for main taking 2843 * parameters and lookups of an unnamed symbol. 2844 */ 2845 if (type->is_void()) { 2846 if (this->identifier != NULL) 2847 _mesa_glsl_error(& loc, state, 2848 "named parameter cannot have type `void'"); 2849 2850 is_void = true; 2851 return NULL; 2852 } 2853 2854 if (formal_parameter && (this->identifier == NULL)) { 2855 _mesa_glsl_error(& loc, state, "formal parameter lacks a name"); 2856 return NULL; 2857 } 2858 2859 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...) 2860 * call already handled the "vec4[..] foo" case. 2861 */ 2862 if (this->is_array) { 2863 type = process_array_type(&loc, type, this->array_size, state); 2864 } 2865 2866 if (type->array_size() == 0) { 2867 _mesa_glsl_error(&loc, state, "arrays passed as parameters must have " 2868 "a declared size."); 2869 type = glsl_type::error_type; 2870 } 2871 2872 is_void = false; 2873 ir_variable *var = new(ctx) ir_variable(type, this->identifier, ir_var_in); 2874 2875 /* Apply any specified qualifiers to the parameter declaration. Note that 2876 * for function parameters the default mode is 'in'. 2877 */ 2878 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc); 2879 2880 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec: 2881 * 2882 * "Samplers cannot be treated as l-values; hence cannot be used 2883 * as out or inout function parameters, nor can they be assigned 2884 * into." 2885 */ 2886 if ((var->mode == ir_var_inout || var->mode == ir_var_out) 2887 && type->contains_sampler()) { 2888 _mesa_glsl_error(&loc, state, "out and inout parameters cannot contain samplers"); 2889 type = glsl_type::error_type; 2890 } 2891 2892 instructions->push_tail(var); 2893 2894 /* Parameter declarations do not have r-values. 2895 */ 2896 return NULL; 2897} 2898 2899 2900void 2901ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters, 2902 bool formal, 2903 exec_list *ir_parameters, 2904 _mesa_glsl_parse_state *state) 2905{ 2906 ast_parameter_declarator *void_param = NULL; 2907 unsigned count = 0; 2908 2909 foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) { 2910 param->formal_parameter = formal; 2911 param->hir(ir_parameters, state); 2912 2913 if (param->is_void) 2914 void_param = param; 2915 2916 count++; 2917 } 2918 2919 if ((void_param != NULL) && (count > 1)) { 2920 YYLTYPE loc = void_param->get_location(); 2921 2922 _mesa_glsl_error(& loc, state, 2923 "`void' parameter must be only parameter"); 2924 } 2925} 2926 2927 2928void 2929emit_function(_mesa_glsl_parse_state *state, exec_list *instructions, 2930 ir_function *f) 2931{ 2932 /* Emit the new function header */ 2933 if (state->current_function == NULL) { 2934 instructions->push_tail(f); 2935 } else { 2936 /* IR invariants disallow function declarations or definitions nested 2937 * within other function definitions. Insert the new ir_function 2938 * block in the instruction sequence before the ir_function block 2939 * containing the current ir_function_signature. 2940 */ 2941 ir_function *const curr = 2942 const_cast<ir_function *>(state->current_function->function()); 2943 2944 curr->insert_before(f); 2945 } 2946} 2947 2948 2949ir_rvalue * 2950ast_function::hir(exec_list *instructions, 2951 struct _mesa_glsl_parse_state *state) 2952{ 2953 void *ctx = state; 2954 ir_function *f = NULL; 2955 ir_function_signature *sig = NULL; 2956 exec_list hir_parameters; 2957 2958 const char *const name = identifier; 2959 2960 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec, 2961 * 2962 * "Function declarations (prototypes) cannot occur inside of functions; 2963 * they must be at global scope, or for the built-in functions, outside 2964 * the global scope." 2965 * 2966 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec, 2967 * 2968 * "User defined functions may only be defined within the global scope." 2969 * 2970 * Note that this language does not appear in GLSL 1.10. 2971 */ 2972 if ((state->current_function != NULL) && (state->language_version != 110)) { 2973 YYLTYPE loc = this->get_location(); 2974 _mesa_glsl_error(&loc, state, 2975 "declaration of function `%s' not allowed within " 2976 "function body", name); 2977 } 2978 2979 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec, 2980 * 2981 * "Identifiers starting with "gl_" are reserved for use by 2982 * OpenGL, and may not be declared in a shader as either a 2983 * variable or a function." 2984 */ 2985 if (strncmp(name, "gl_", 3) == 0) { 2986 YYLTYPE loc = this->get_location(); 2987 _mesa_glsl_error(&loc, state, 2988 "identifier `%s' uses reserved `gl_' prefix", name); 2989 } 2990 2991 /* Convert the list of function parameters to HIR now so that they can be 2992 * used below to compare this function's signature with previously seen 2993 * signatures for functions with the same name. 2994 */ 2995 ast_parameter_declarator::parameters_to_hir(& this->parameters, 2996 is_definition, 2997 & hir_parameters, state); 2998 2999 const char *return_type_name; 3000 const glsl_type *return_type = 3001 this->return_type->specifier->glsl_type(& return_type_name, state); 3002 3003 if (!return_type) { 3004 YYLTYPE loc = this->get_location(); 3005 _mesa_glsl_error(&loc, state, 3006 "function `%s' has undeclared return type `%s'", 3007 name, return_type_name); 3008 return_type = glsl_type::error_type; 3009 } 3010 3011 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec: 3012 * "No qualifier is allowed on the return type of a function." 3013 */ 3014 if (this->return_type->has_qualifiers()) { 3015 YYLTYPE loc = this->get_location(); 3016 _mesa_glsl_error(& loc, state, 3017 "function `%s' return type has qualifiers", name); 3018 } 3019 3020 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec: 3021 * 3022 * "[Sampler types] can only be declared as function parameters 3023 * or uniform variables (see Section 4.3.5 "Uniform")". 3024 */ 3025 if (return_type->contains_sampler()) { 3026 YYLTYPE loc = this->get_location(); 3027 _mesa_glsl_error(&loc, state, 3028 "function `%s' return type can't contain a sampler", 3029 name); 3030 } 3031 3032 /* Verify that this function's signature either doesn't match a previously 3033 * seen signature for a function with the same name, or, if a match is found, 3034 * that the previously seen signature does not have an associated definition. 3035 */ 3036 f = state->symbols->get_function(name); 3037 if (f != NULL && (state->es_shader || f->has_user_signature())) { 3038 sig = f->exact_matching_signature(&hir_parameters); 3039 if (sig != NULL) { 3040 const char *badvar = sig->qualifiers_match(&hir_parameters); 3041 if (badvar != NULL) { 3042 YYLTYPE loc = this->get_location(); 3043 3044 _mesa_glsl_error(&loc, state, "function `%s' parameter `%s' " 3045 "qualifiers don't match prototype", name, badvar); 3046 } 3047 3048 if (sig->return_type != return_type) { 3049 YYLTYPE loc = this->get_location(); 3050 3051 _mesa_glsl_error(&loc, state, "function `%s' return type doesn't " 3052 "match prototype", name); 3053 } 3054 3055 if (is_definition && sig->is_defined) { 3056 YYLTYPE loc = this->get_location(); 3057 3058 _mesa_glsl_error(& loc, state, "function `%s' redefined", name); 3059 } 3060 } 3061 } else { 3062 f = new(ctx) ir_function(name); 3063 if (!state->symbols->add_function(f)) { 3064 /* This function name shadows a non-function use of the same name. */ 3065 YYLTYPE loc = this->get_location(); 3066 3067 _mesa_glsl_error(&loc, state, "function name `%s' conflicts with " 3068 "non-function", name); 3069 return NULL; 3070 } 3071 3072 emit_function(state, instructions, f); 3073 } 3074 3075 /* Verify the return type of main() */ 3076 if (strcmp(name, "main") == 0) { 3077 if (! return_type->is_void()) { 3078 YYLTYPE loc = this->get_location(); 3079 3080 _mesa_glsl_error(& loc, state, "main() must return void"); 3081 } 3082 3083 if (!hir_parameters.is_empty()) { 3084 YYLTYPE loc = this->get_location(); 3085 3086 _mesa_glsl_error(& loc, state, "main() must not take any parameters"); 3087 } 3088 } 3089 3090 /* Finish storing the information about this new function in its signature. 3091 */ 3092 if (sig == NULL) { 3093 sig = new(ctx) ir_function_signature(return_type); 3094 f->add_signature(sig); 3095 } 3096 3097 sig->replace_parameters(&hir_parameters); 3098 signature = sig; 3099 3100 /* Function declarations (prototypes) do not have r-values. 3101 */ 3102 return NULL; 3103} 3104 3105 3106ir_rvalue * 3107ast_function_definition::hir(exec_list *instructions, 3108 struct _mesa_glsl_parse_state *state) 3109{ 3110 prototype->is_definition = true; 3111 prototype->hir(instructions, state); 3112 3113 ir_function_signature *signature = prototype->signature; 3114 if (signature == NULL) 3115 return NULL; 3116 3117 assert(state->current_function == NULL); 3118 state->current_function = signature; 3119 state->found_return = false; 3120 3121 /* Duplicate parameters declared in the prototype as concrete variables. 3122 * Add these to the symbol table. 3123 */ 3124 state->symbols->push_scope(); 3125 foreach_iter(exec_list_iterator, iter, signature->parameters) { 3126 ir_variable *const var = ((ir_instruction *) iter.get())->as_variable(); 3127 3128 assert(var != NULL); 3129 3130 /* The only way a parameter would "exist" is if two parameters have 3131 * the same name. 3132 */ 3133 if (state->symbols->name_declared_this_scope(var->name)) { 3134 YYLTYPE loc = this->get_location(); 3135 3136 _mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name); 3137 } else { 3138 state->symbols->add_variable(var); 3139 } 3140 } 3141 3142 /* Convert the body of the function to HIR. */ 3143 this->body->hir(&signature->body, state); 3144 signature->is_defined = true; 3145 3146 state->symbols->pop_scope(); 3147 3148 assert(state->current_function == signature); 3149 state->current_function = NULL; 3150 3151 if (!signature->return_type->is_void() && !state->found_return) { 3152 YYLTYPE loc = this->get_location(); 3153 _mesa_glsl_error(& loc, state, "function `%s' has non-void return type " 3154 "%s, but no return statement", 3155 signature->function_name(), 3156 signature->return_type->name); 3157 } 3158 3159 /* Function definitions do not have r-values. 3160 */ 3161 return NULL; 3162} 3163 3164 3165ir_rvalue * 3166ast_jump_statement::hir(exec_list *instructions, 3167 struct _mesa_glsl_parse_state *state) 3168{ 3169 void *ctx = state; 3170 3171 switch (mode) { 3172 case ast_return: { 3173 ir_return *inst; 3174 assert(state->current_function); 3175 3176 if (opt_return_value) { 3177 ir_rvalue *const ret = opt_return_value->hir(instructions, state); 3178 3179 /* The value of the return type can be NULL if the shader says 3180 * 'return foo();' and foo() is a function that returns void. 3181 * 3182 * NOTE: The GLSL spec doesn't say that this is an error. The type 3183 * of the return value is void. If the return type of the function is 3184 * also void, then this should compile without error. Seriously. 3185 */ 3186 const glsl_type *const ret_type = 3187 (ret == NULL) ? glsl_type::void_type : ret->type; 3188 3189 /* Implicit conversions are not allowed for return values. */ 3190 if (state->current_function->return_type != ret_type) { 3191 YYLTYPE loc = this->get_location(); 3192 3193 _mesa_glsl_error(& loc, state, 3194 "`return' with wrong type %s, in function `%s' " 3195 "returning %s", 3196 ret_type->name, 3197 state->current_function->function_name(), 3198 state->current_function->return_type->name); 3199 } 3200 3201 inst = new(ctx) ir_return(ret); 3202 } else { 3203 if (state->current_function->return_type->base_type != 3204 GLSL_TYPE_VOID) { 3205 YYLTYPE loc = this->get_location(); 3206 3207 _mesa_glsl_error(& loc, state, 3208 "`return' with no value, in function %s returning " 3209 "non-void", 3210 state->current_function->function_name()); 3211 } 3212 inst = new(ctx) ir_return; 3213 } 3214 3215 state->found_return = true; 3216 instructions->push_tail(inst); 3217 break; 3218 } 3219 3220 case ast_discard: 3221 if (state->target != fragment_shader) { 3222 YYLTYPE loc = this->get_location(); 3223 3224 _mesa_glsl_error(& loc, state, 3225 "`discard' may only appear in a fragment shader"); 3226 } 3227 instructions->push_tail(new(ctx) ir_discard); 3228 break; 3229 3230 case ast_break: 3231 case ast_continue: 3232 /* FINISHME: Handle switch-statements. They cannot contain 'continue', 3233 * FINISHME: and they use a different IR instruction for 'break'. 3234 */ 3235 /* FINISHME: Correctly handle the nesting. If a switch-statement is 3236 * FINISHME: inside a loop, a 'continue' is valid and will bind to the 3237 * FINISHME: loop. 3238 */ 3239 if (state->loop_or_switch_nesting == NULL) { 3240 YYLTYPE loc = this->get_location(); 3241 3242 _mesa_glsl_error(& loc, state, 3243 "`%s' may only appear in a loop", 3244 (mode == ast_break) ? "break" : "continue"); 3245 } else { 3246 ir_loop *const loop = state->loop_or_switch_nesting->as_loop(); 3247 3248 /* Inline the for loop expression again, since we don't know 3249 * where near the end of the loop body the normal copy of it 3250 * is going to be placed. 3251 */ 3252 if (mode == ast_continue && 3253 state->loop_or_switch_nesting_ast->rest_expression) { 3254 state->loop_or_switch_nesting_ast->rest_expression->hir(instructions, 3255 state); 3256 } 3257 3258 if (loop != NULL) { 3259 ir_loop_jump *const jump = 3260 new(ctx) ir_loop_jump((mode == ast_break) 3261 ? ir_loop_jump::jump_break 3262 : ir_loop_jump::jump_continue); 3263 instructions->push_tail(jump); 3264 } 3265 } 3266 3267 break; 3268 } 3269 3270 /* Jump instructions do not have r-values. 3271 */ 3272 return NULL; 3273} 3274 3275 3276ir_rvalue * 3277ast_selection_statement::hir(exec_list *instructions, 3278 struct _mesa_glsl_parse_state *state) 3279{ 3280 void *ctx = state; 3281 3282 ir_rvalue *const condition = this->condition->hir(instructions, state); 3283 3284 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec: 3285 * 3286 * "Any expression whose type evaluates to a Boolean can be used as the 3287 * conditional expression bool-expression. Vector types are not accepted 3288 * as the expression to if." 3289 * 3290 * The checks are separated so that higher quality diagnostics can be 3291 * generated for cases where both rules are violated. 3292 */ 3293 if (!condition->type->is_boolean() || !condition->type->is_scalar()) { 3294 YYLTYPE loc = this->condition->get_location(); 3295 3296 _mesa_glsl_error(& loc, state, "if-statement condition must be scalar " 3297 "boolean"); 3298 } 3299 3300 ir_if *const stmt = new(ctx) ir_if(condition); 3301 3302 if (then_statement != NULL) { 3303 state->symbols->push_scope(); 3304 then_statement->hir(& stmt->then_instructions, state); 3305 state->symbols->pop_scope(); 3306 } 3307 3308 if (else_statement != NULL) { 3309 state->symbols->push_scope(); 3310 else_statement->hir(& stmt->else_instructions, state); 3311 state->symbols->pop_scope(); 3312 } 3313 3314 instructions->push_tail(stmt); 3315 3316 /* if-statements do not have r-values. 3317 */ 3318 return NULL; 3319} 3320 3321 3322void 3323ast_iteration_statement::condition_to_hir(ir_loop *stmt, 3324 struct _mesa_glsl_parse_state *state) 3325{ 3326 void *ctx = state; 3327 3328 if (condition != NULL) { 3329 ir_rvalue *const cond = 3330 condition->hir(& stmt->body_instructions, state); 3331 3332 if ((cond == NULL) 3333 || !cond->type->is_boolean() || !cond->type->is_scalar()) { 3334 YYLTYPE loc = condition->get_location(); 3335 3336 _mesa_glsl_error(& loc, state, 3337 "loop condition must be scalar boolean"); 3338 } else { 3339 /* As the first code in the loop body, generate a block that looks 3340 * like 'if (!condition) break;' as the loop termination condition. 3341 */ 3342 ir_rvalue *const not_cond = 3343 new(ctx) ir_expression(ir_unop_logic_not, glsl_type::bool_type, cond, 3344 NULL); 3345 3346 ir_if *const if_stmt = new(ctx) ir_if(not_cond); 3347 3348 ir_jump *const break_stmt = 3349 new(ctx) ir_loop_jump(ir_loop_jump::jump_break); 3350 3351 if_stmt->then_instructions.push_tail(break_stmt); 3352 stmt->body_instructions.push_tail(if_stmt); 3353 } 3354 } 3355} 3356 3357 3358ir_rvalue * 3359ast_iteration_statement::hir(exec_list *instructions, 3360 struct _mesa_glsl_parse_state *state) 3361{ 3362 void *ctx = state; 3363 3364 /* For-loops and while-loops start a new scope, but do-while loops do not. 3365 */ 3366 if (mode != ast_do_while) 3367 state->symbols->push_scope(); 3368 3369 if (init_statement != NULL) 3370 init_statement->hir(instructions, state); 3371 3372 ir_loop *const stmt = new(ctx) ir_loop(); 3373 instructions->push_tail(stmt); 3374 3375 /* Track the current loop and / or switch-statement nesting. 3376 */ 3377 ir_instruction *const nesting = state->loop_or_switch_nesting; 3378 ast_iteration_statement *nesting_ast = state->loop_or_switch_nesting_ast; 3379 3380 state->loop_or_switch_nesting = stmt; 3381 state->loop_or_switch_nesting_ast = this; 3382 3383 if (mode != ast_do_while) 3384 condition_to_hir(stmt, state); 3385 3386 if (body != NULL) 3387 body->hir(& stmt->body_instructions, state); 3388 3389 if (rest_expression != NULL) 3390 rest_expression->hir(& stmt->body_instructions, state); 3391 3392 if (mode == ast_do_while) 3393 condition_to_hir(stmt, state); 3394 3395 if (mode != ast_do_while) 3396 state->symbols->pop_scope(); 3397 3398 /* Restore previous nesting before returning. 3399 */ 3400 state->loop_or_switch_nesting = nesting; 3401 state->loop_or_switch_nesting_ast = nesting_ast; 3402 3403 /* Loops do not have r-values. 3404 */ 3405 return NULL; 3406} 3407 3408 3409ir_rvalue * 3410ast_type_specifier::hir(exec_list *instructions, 3411 struct _mesa_glsl_parse_state *state) 3412{ 3413 if (!this->is_precision_statement && this->structure == NULL) 3414 return NULL; 3415 3416 YYLTYPE loc = this->get_location(); 3417 3418 if (this->precision != ast_precision_none 3419 && state->language_version != 100 3420 && state->language_version < 130) { 3421 _mesa_glsl_error(&loc, state, 3422 "precision qualifiers exist only in " 3423 "GLSL ES 1.00, and GLSL 1.30 and later"); 3424 return NULL; 3425 } 3426 if (this->precision != ast_precision_none 3427 && this->structure != NULL) { 3428 _mesa_glsl_error(&loc, state, 3429 "precision qualifiers do not apply to structures"); 3430 return NULL; 3431 } 3432 3433 /* If this is a precision statement, check that the type to which it is 3434 * applied is either float or int. 3435 * 3436 * From section 4.5.3 of the GLSL 1.30 spec: 3437 * "The precision statement 3438 * precision precision-qualifier type; 3439 * can be used to establish a default precision qualifier. The type 3440 * field can be either int or float [...]. Any other types or 3441 * qualifiers will result in an error. 3442 */ 3443 if (this->is_precision_statement) { 3444 assert(this->precision != ast_precision_none); 3445 assert(this->structure == NULL); /* The check for structures was 3446 * performed above. */ 3447 if (this->is_array) { 3448 _mesa_glsl_error(&loc, state, 3449 "default precision statements do not apply to " 3450 "arrays"); 3451 return NULL; 3452 } 3453 if (this->type_specifier != ast_float 3454 && this->type_specifier != ast_int) { 3455 _mesa_glsl_error(&loc, state, 3456 "default precision statements apply only to types " 3457 "float and int"); 3458 return NULL; 3459 } 3460 3461 /* FINISHME: Translate precision statements into IR. */ 3462 return NULL; 3463 } 3464 3465 if (this->structure != NULL) 3466 return this->structure->hir(instructions, state); 3467 3468 return NULL; 3469} 3470 3471 3472ir_rvalue * 3473ast_struct_specifier::hir(exec_list *instructions, 3474 struct _mesa_glsl_parse_state *state) 3475{ 3476 unsigned decl_count = 0; 3477 3478 /* Make an initial pass over the list of structure fields to determine how 3479 * many there are. Each element in this list is an ast_declarator_list. 3480 * This means that we actually need to count the number of elements in the 3481 * 'declarations' list in each of the elements. 3482 */ 3483 foreach_list_typed (ast_declarator_list, decl_list, link, 3484 &this->declarations) { 3485 foreach_list_const (decl_ptr, & decl_list->declarations) { 3486 decl_count++; 3487 } 3488 } 3489 3490 /* Allocate storage for the structure fields and process the field 3491 * declarations. As the declarations are processed, try to also convert 3492 * the types to HIR. This ensures that structure definitions embedded in 3493 * other structure definitions are processed. 3494 */ 3495 glsl_struct_field *const fields = ralloc_array(state, glsl_struct_field, 3496 decl_count); 3497 3498 unsigned i = 0; 3499 foreach_list_typed (ast_declarator_list, decl_list, link, 3500 &this->declarations) { 3501 const char *type_name; 3502 3503 decl_list->type->specifier->hir(instructions, state); 3504 3505 /* Section 10.9 of the GLSL ES 1.00 specification states that 3506 * embedded structure definitions have been removed from the language. 3507 */ 3508 if (state->es_shader && decl_list->type->specifier->structure != NULL) { 3509 YYLTYPE loc = this->get_location(); 3510 _mesa_glsl_error(&loc, state, "Embedded structure definitions are " 3511 "not allowed in GLSL ES 1.00."); 3512 } 3513 3514 const glsl_type *decl_type = 3515 decl_list->type->specifier->glsl_type(& type_name, state); 3516 3517 foreach_list_typed (ast_declaration, decl, link, 3518 &decl_list->declarations) { 3519 const struct glsl_type *field_type = decl_type; 3520 if (decl->is_array) { 3521 YYLTYPE loc = decl->get_location(); 3522 field_type = process_array_type(&loc, decl_type, decl->array_size, 3523 state); 3524 } 3525 fields[i].type = (field_type != NULL) 3526 ? field_type : glsl_type::error_type; 3527 fields[i].name = decl->identifier; 3528 i++; 3529 } 3530 } 3531 3532 assert(i == decl_count); 3533 3534 const glsl_type *t = 3535 glsl_type::get_record_instance(fields, decl_count, this->name); 3536 3537 YYLTYPE loc = this->get_location(); 3538 if (!state->symbols->add_type(name, t)) { 3539 _mesa_glsl_error(& loc, state, "struct `%s' previously defined", name); 3540 } else { 3541 const glsl_type **s = reralloc(state, state->user_structures, 3542 const glsl_type *, 3543 state->num_user_structures + 1); 3544 if (s != NULL) { 3545 s[state->num_user_structures] = t; 3546 state->user_structures = s; 3547 state->num_user_structures++; 3548 } 3549 } 3550 3551 /* Structure type definitions do not have r-values. 3552 */ 3553 return NULL; 3554} 3555