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 "glsl_symbol_table.h" 53 #include "glsl_parser_extras.h" 54 #include "ast.h" 55 #include "compiler/glsl_types.h" 56 #include "util/hash_table.h" 57 #include "main/macros.h" 58 #include "main/shaderobj.h" 59 #include "ir.h" 60 #include "ir_builder.h" 61 #include "builtin_functions.h" 62 63 using namespace ir_builder; 64 65 static void 66 detect_conflicting_assignments(struct _mesa_glsl_parse_state *state, 67 exec_list *instructions); 68 static void 69 remove_per_vertex_blocks(exec_list *instructions, 70 _mesa_glsl_parse_state *state, ir_variable_mode mode); 71 72 /** 73 * Visitor class that finds the first instance of any write-only variable that 74 * is ever read, if any 75 */ 76 class read_from_write_only_variable_visitor : public ir_hierarchical_visitor 77 { 78 public: 79 read_from_write_only_variable_visitor() : found(NULL) 80 { 81 } 82 83 virtual ir_visitor_status visit(ir_dereference_variable *ir) 84 { 85 if (this->in_assignee) 86 return visit_continue; 87 88 ir_variable *var = ir->variable_referenced(); 89 /* We can have memory_write_only set on both images and buffer variables, 90 * but in the former there is a distinction between reads from 91 * the variable itself (write_only) and from the memory they point to 92 * (memory_write_only), while in the case of buffer variables there is 93 * no such distinction, that is why this check here is limited to 94 * buffer variables alone. 95 */ 96 if (!var || var->data.mode != ir_var_shader_storage) 97 return visit_continue; 98 99 if (var->data.memory_write_only) { 100 found = var; 101 return visit_stop; 102 } 103 104 return visit_continue; 105 } 106 107 ir_variable *get_variable() { 108 return found; 109 } 110 111 virtual ir_visitor_status visit_enter(ir_expression *ir) 112 { 113 /* .length() doesn't actually read anything */ 114 if (ir->operation == ir_unop_ssbo_unsized_array_length) 115 return visit_continue_with_parent; 116 117 return visit_continue; 118 } 119 120 private: 121 ir_variable *found; 122 }; 123 124 void 125 _mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state) 126 { 127 _mesa_glsl_initialize_variables(instructions, state); 128 129 state->symbols->separate_function_namespace = state->language_version == 110; 130 131 state->current_function = NULL; 132 133 state->toplevel_ir = instructions; 134 135 state->gs_input_prim_type_specified = false; 136 state->tcs_output_vertices_specified = false; 137 state->cs_input_local_size_specified = false; 138 139 /* Section 4.2 of the GLSL 1.20 specification states: 140 * "The built-in functions are scoped in a scope outside the global scope 141 * users declare global variables in. That is, a shader's global scope, 142 * available for user-defined functions and global variables, is nested 143 * inside the scope containing the built-in functions." 144 * 145 * Since built-in functions like ftransform() access built-in variables, 146 * it follows that those must be in the outer scope as well. 147 * 148 * We push scope here to create this nesting effect...but don't pop. 149 * This way, a shader's globals are still in the symbol table for use 150 * by the linker. 151 */ 152 state->symbols->push_scope(); 153 154 foreach_list_typed (ast_node, ast, link, & state->translation_unit) 155 ast->hir(instructions, state); 156 157 detect_recursion_unlinked(state, instructions); 158 detect_conflicting_assignments(state, instructions); 159 160 state->toplevel_ir = NULL; 161 162 /* Move all of the variable declarations to the front of the IR list, and 163 * reverse the order. This has the (intended!) side effect that vertex 164 * shader inputs and fragment shader outputs will appear in the IR in the 165 * same order that they appeared in the shader code. This results in the 166 * locations being assigned in the declared order. Many (arguably buggy) 167 * applications depend on this behavior, and it matches what nearly all 168 * other drivers do. 169 */ 170 foreach_in_list_safe(ir_instruction, node, instructions) { 171 ir_variable *const var = node->as_variable(); 172 173 if (var == NULL) 174 continue; 175 176 var->remove(); 177 instructions->push_head(var); 178 } 179 180 /* Figure out if gl_FragCoord is actually used in fragment shader */ 181 ir_variable *const var = state->symbols->get_variable("gl_FragCoord"); 182 if (var != NULL) 183 state->fs_uses_gl_fragcoord = var->data.used; 184 185 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec: 186 * 187 * If multiple shaders using members of a built-in block belonging to 188 * the same interface are linked together in the same program, they 189 * must all redeclare the built-in block in the same way, as described 190 * in section 4.3.7 "Interface Blocks" for interface block matching, or 191 * a link error will result. 192 * 193 * The phrase "using members of a built-in block" implies that if two 194 * shaders are linked together and one of them *does not use* any members 195 * of the built-in block, then that shader does not need to have a matching 196 * redeclaration of the built-in block. 197 * 198 * This appears to be a clarification to the behaviour established for 199 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL 200 * version. 201 * 202 * The definition of "interface" in section 4.3.7 that applies here is as 203 * follows: 204 * 205 * The boundary between adjacent programmable pipeline stages: This 206 * spans all the outputs in all compilation units of the first stage 207 * and all the inputs in all compilation units of the second stage. 208 * 209 * Therefore this rule applies to both inter- and intra-stage linking. 210 * 211 * The easiest way to implement this is to check whether the shader uses 212 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply 213 * remove all the relevant variable declaration from the IR, so that the 214 * linker won't see them and complain about mismatches. 215 */ 216 remove_per_vertex_blocks(instructions, state, ir_var_shader_in); 217 remove_per_vertex_blocks(instructions, state, ir_var_shader_out); 218 219 /* Check that we don't have reads from write-only variables */ 220 read_from_write_only_variable_visitor v; 221 v.run(instructions); 222 ir_variable *error_var = v.get_variable(); 223 if (error_var) { 224 /* It would be nice to have proper location information, but for that 225 * we would need to check this as we process each kind of AST node 226 */ 227 YYLTYPE loc; 228 memset(&loc, 0, sizeof(loc)); 229 _mesa_glsl_error(&loc, state, "Read from write-only variable `%s'", 230 error_var->name); 231 } 232 } 233 234 235 static ir_expression_operation 236 get_implicit_conversion_operation(const glsl_type *to, const glsl_type *from, 237 struct _mesa_glsl_parse_state *state) 238 { 239 switch (to->base_type) { 240 case GLSL_TYPE_FLOAT: 241 switch (from->base_type) { 242 case GLSL_TYPE_INT: return ir_unop_i2f; 243 case GLSL_TYPE_UINT: return ir_unop_u2f; 244 default: return (ir_expression_operation)0; 245 } 246 247 case GLSL_TYPE_UINT: 248 if (!state->is_version(400, 0) && !state->ARB_gpu_shader5_enable 249 && !state->MESA_shader_integer_functions_enable) 250 return (ir_expression_operation)0; 251 switch (from->base_type) { 252 case GLSL_TYPE_INT: return ir_unop_i2u; 253 default: return (ir_expression_operation)0; 254 } 255 256 case GLSL_TYPE_DOUBLE: 257 if (!state->has_double()) 258 return (ir_expression_operation)0; 259 switch (from->base_type) { 260 case GLSL_TYPE_INT: return ir_unop_i2d; 261 case GLSL_TYPE_UINT: return ir_unop_u2d; 262 case GLSL_TYPE_FLOAT: return ir_unop_f2d; 263 case GLSL_TYPE_INT64: return ir_unop_i642d; 264 case GLSL_TYPE_UINT64: return ir_unop_u642d; 265 default: return (ir_expression_operation)0; 266 } 267 268 case GLSL_TYPE_UINT64: 269 if (!state->has_int64()) 270 return (ir_expression_operation)0; 271 switch (from->base_type) { 272 case GLSL_TYPE_INT: return ir_unop_i2u64; 273 case GLSL_TYPE_UINT: return ir_unop_u2u64; 274 case GLSL_TYPE_INT64: return ir_unop_i642u64; 275 default: return (ir_expression_operation)0; 276 } 277 278 case GLSL_TYPE_INT64: 279 if (!state->has_int64()) 280 return (ir_expression_operation)0; 281 switch (from->base_type) { 282 case GLSL_TYPE_INT: return ir_unop_i2i64; 283 default: return (ir_expression_operation)0; 284 } 285 286 default: return (ir_expression_operation)0; 287 } 288 } 289 290 291 /** 292 * If a conversion is available, convert one operand to a different type 293 * 294 * The \c from \c ir_rvalue is converted "in place". 295 * 296 * \param to Type that the operand it to be converted to 297 * \param from Operand that is being converted 298 * \param state GLSL compiler state 299 * 300 * \return 301 * If a conversion is possible (or unnecessary), \c true is returned. 302 * Otherwise \c false is returned. 303 */ 304 static bool 305 apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from, 306 struct _mesa_glsl_parse_state *state) 307 { 308 void *ctx = state; 309 if (to->base_type == from->type->base_type) 310 return true; 311 312 /* Prior to GLSL 1.20, there are no implicit conversions */ 313 if (!state->is_version(120, 0)) 314 return false; 315 316 /* ESSL does not allow implicit conversions */ 317 if (state->es_shader) 318 return false; 319 320 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec: 321 * 322 * "There are no implicit array or structure conversions. For 323 * example, an array of int cannot be implicitly converted to an 324 * array of float. 325 */ 326 if (!to->is_numeric() || !from->type->is_numeric()) 327 return false; 328 329 /* We don't actually want the specific type `to`, we want a type 330 * with the same base type as `to`, but the same vector width as 331 * `from`. 332 */ 333 to = glsl_type::get_instance(to->base_type, from->type->vector_elements, 334 from->type->matrix_columns); 335 336 ir_expression_operation op = get_implicit_conversion_operation(to, from->type, state); 337 if (op) { 338 from = new(ctx) ir_expression(op, to, from, NULL); 339 return true; 340 } else { 341 return false; 342 } 343 } 344 345 346 static const struct glsl_type * 347 arithmetic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b, 348 bool multiply, 349 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 350 { 351 const glsl_type *type_a = value_a->type; 352 const glsl_type *type_b = value_b->type; 353 354 /* From GLSL 1.50 spec, page 56: 355 * 356 * "The arithmetic binary operators add (+), subtract (-), 357 * multiply (*), and divide (/) operate on integer and 358 * floating-point scalars, vectors, and matrices." 359 */ 360 if (!type_a->is_numeric() || !type_b->is_numeric()) { 361 _mesa_glsl_error(loc, state, 362 "operands to arithmetic operators must be numeric"); 363 return glsl_type::error_type; 364 } 365 366 367 /* "If one operand is floating-point based and the other is 368 * not, then the conversions from Section 4.1.10 "Implicit 369 * Conversions" are applied to the non-floating-point-based operand." 370 */ 371 if (!apply_implicit_conversion(type_a, value_b, state) 372 && !apply_implicit_conversion(type_b, value_a, state)) { 373 _mesa_glsl_error(loc, state, 374 "could not implicitly convert operands to " 375 "arithmetic operator"); 376 return glsl_type::error_type; 377 } 378 type_a = value_a->type; 379 type_b = value_b->type; 380 381 /* "If the operands are integer types, they must both be signed or 382 * both be unsigned." 383 * 384 * From this rule and the preceeding conversion it can be inferred that 385 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT. 386 * The is_numeric check above already filtered out the case where either 387 * type is not one of these, so now the base types need only be tested for 388 * equality. 389 */ 390 if (type_a->base_type != type_b->base_type) { 391 _mesa_glsl_error(loc, state, 392 "base type mismatch for arithmetic operator"); 393 return glsl_type::error_type; 394 } 395 396 /* "All arithmetic binary operators result in the same fundamental type 397 * (signed integer, unsigned integer, or floating-point) as the 398 * operands they operate on, after operand type conversion. After 399 * conversion, the following cases are valid 400 * 401 * * The two operands are scalars. In this case the operation is 402 * applied, resulting in a scalar." 403 */ 404 if (type_a->is_scalar() && type_b->is_scalar()) 405 return type_a; 406 407 /* "* One operand is a scalar, and the other is a vector or matrix. 408 * In this case, the scalar operation is applied independently to each 409 * component of the vector or matrix, resulting in the same size 410 * vector or matrix." 411 */ 412 if (type_a->is_scalar()) { 413 if (!type_b->is_scalar()) 414 return type_b; 415 } else if (type_b->is_scalar()) { 416 return type_a; 417 } 418 419 /* All of the combinations of <scalar, scalar>, <vector, scalar>, 420 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been 421 * handled. 422 */ 423 assert(!type_a->is_scalar()); 424 assert(!type_b->is_scalar()); 425 426 /* "* The two operands are vectors of the same size. In this case, the 427 * operation is done component-wise resulting in the same size 428 * vector." 429 */ 430 if (type_a->is_vector() && type_b->is_vector()) { 431 if (type_a == type_b) { 432 return type_a; 433 } else { 434 _mesa_glsl_error(loc, state, 435 "vector size mismatch for arithmetic operator"); 436 return glsl_type::error_type; 437 } 438 } 439 440 /* All of the combinations of <scalar, scalar>, <vector, scalar>, 441 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and 442 * <vector, vector> have been handled. At least one of the operands must 443 * be matrix. Further, since there are no integer matrix types, the base 444 * type of both operands must be float. 445 */ 446 assert(type_a->is_matrix() || type_b->is_matrix()); 447 assert(type_a->is_float() || type_a->is_double()); 448 assert(type_b->is_float() || type_b->is_double()); 449 450 /* "* The operator is add (+), subtract (-), or divide (/), and the 451 * operands are matrices with the same number of rows and the same 452 * number of columns. In this case, the operation is done component- 453 * wise resulting in the same size matrix." 454 * * The operator is multiply (*), where both operands are matrices or 455 * one operand is a vector and the other a matrix. A right vector 456 * operand is treated as a column vector and a left vector operand as a 457 * row vector. In all these cases, it is required that the number of 458 * columns of the left operand is equal to the number of rows of the 459 * right operand. Then, the multiply (*) operation does a linear 460 * algebraic multiply, yielding an object that has the same number of 461 * rows as the left operand and the same number of columns as the right 462 * operand. Section 5.10 "Vector and Matrix Operations" explains in 463 * more detail how vectors and matrices are operated on." 464 */ 465 if (! multiply) { 466 if (type_a == type_b) 467 return type_a; 468 } else { 469 const glsl_type *type = glsl_type::get_mul_type(type_a, type_b); 470 471 if (type == glsl_type::error_type) { 472 _mesa_glsl_error(loc, state, 473 "size mismatch for matrix multiplication"); 474 } 475 476 return type; 477 } 478 479 480 /* "All other cases are illegal." 481 */ 482 _mesa_glsl_error(loc, state, "type mismatch"); 483 return glsl_type::error_type; 484 } 485 486 487 static const struct glsl_type * 488 unary_arithmetic_result_type(const struct glsl_type *type, 489 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 490 { 491 /* From GLSL 1.50 spec, page 57: 492 * 493 * "The arithmetic unary operators negate (-), post- and pre-increment 494 * and decrement (-- and ++) operate on integer or floating-point 495 * values (including vectors and matrices). All unary operators work 496 * component-wise on their operands. These result with the same type 497 * they operated on." 498 */ 499 if (!type->is_numeric()) { 500 _mesa_glsl_error(loc, state, 501 "operands to arithmetic operators must be numeric"); 502 return glsl_type::error_type; 503 } 504 505 return type; 506 } 507 508 /** 509 * \brief Return the result type of a bit-logic operation. 510 * 511 * If the given types to the bit-logic operator are invalid, return 512 * glsl_type::error_type. 513 * 514 * \param value_a LHS of bit-logic op 515 * \param value_b RHS of bit-logic op 516 */ 517 static const struct glsl_type * 518 bit_logic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b, 519 ast_operators op, 520 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 521 { 522 const glsl_type *type_a = value_a->type; 523 const glsl_type *type_b = value_b->type; 524 525 if (!state->check_bitwise_operations_allowed(loc)) { 526 return glsl_type::error_type; 527 } 528 529 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec: 530 * 531 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or 532 * (|). The operands must be of type signed or unsigned integers or 533 * integer vectors." 534 */ 535 if (!type_a->is_integer_32_64()) { 536 _mesa_glsl_error(loc, state, "LHS of `%s' must be an integer", 537 ast_expression::operator_string(op)); 538 return glsl_type::error_type; 539 } 540 if (!type_b->is_integer_32_64()) { 541 _mesa_glsl_error(loc, state, "RHS of `%s' must be an integer", 542 ast_expression::operator_string(op)); 543 return glsl_type::error_type; 544 } 545 546 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't 547 * make sense for bitwise operations, as they don't operate on floats. 548 * 549 * GLSL 4.0 added implicit int -> uint conversions, which are relevant 550 * here. It wasn't clear whether or not we should apply them to bitwise 551 * operations. However, Khronos has decided that they should in future 552 * language revisions. Applications also rely on this behavior. We opt 553 * to apply them in general, but issue a portability warning. 554 * 555 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405 556 */ 557 if (type_a->base_type != type_b->base_type) { 558 if (!apply_implicit_conversion(type_a, value_b, state) 559 && !apply_implicit_conversion(type_b, value_a, state)) { 560 _mesa_glsl_error(loc, state, 561 "could not implicitly convert operands to " 562 "`%s` operator", 563 ast_expression::operator_string(op)); 564 return glsl_type::error_type; 565 } else { 566 _mesa_glsl_warning(loc, state, 567 "some implementations may not support implicit " 568 "int -> uint conversions for `%s' operators; " 569 "consider casting explicitly for portability", 570 ast_expression::operator_string(op)); 571 } 572 type_a = value_a->type; 573 type_b = value_b->type; 574 } 575 576 /* "The fundamental types of the operands (signed or unsigned) must 577 * match," 578 */ 579 if (type_a->base_type != type_b->base_type) { 580 _mesa_glsl_error(loc, state, "operands of `%s' must have the same " 581 "base type", ast_expression::operator_string(op)); 582 return glsl_type::error_type; 583 } 584 585 /* "The operands cannot be vectors of differing size." */ 586 if (type_a->is_vector() && 587 type_b->is_vector() && 588 type_a->vector_elements != type_b->vector_elements) { 589 _mesa_glsl_error(loc, state, "operands of `%s' cannot be vectors of " 590 "different sizes", ast_expression::operator_string(op)); 591 return glsl_type::error_type; 592 } 593 594 /* "If one operand is a scalar and the other a vector, the scalar is 595 * applied component-wise to the vector, resulting in the same type as 596 * the vector. The fundamental types of the operands [...] will be the 597 * resulting fundamental type." 598 */ 599 if (type_a->is_scalar()) 600 return type_b; 601 else 602 return type_a; 603 } 604 605 static const struct glsl_type * 606 modulus_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b, 607 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 608 { 609 const glsl_type *type_a = value_a->type; 610 const glsl_type *type_b = value_b->type; 611 612 if (!state->check_version(130, 300, loc, "operator '%%' is reserved")) { 613 return glsl_type::error_type; 614 } 615 616 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says: 617 * 618 * "The operator modulus (%) operates on signed or unsigned integers or 619 * integer vectors." 620 */ 621 if (!type_a->is_integer_32_64()) { 622 _mesa_glsl_error(loc, state, "LHS of operator %% must be an integer"); 623 return glsl_type::error_type; 624 } 625 if (!type_b->is_integer_32_64()) { 626 _mesa_glsl_error(loc, state, "RHS of operator %% must be an integer"); 627 return glsl_type::error_type; 628 } 629 630 /* "If the fundamental types in the operands do not match, then the 631 * conversions from section 4.1.10 "Implicit Conversions" are applied 632 * to create matching types." 633 * 634 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit 635 * int -> uint conversion rules. Prior to that, there were no implicit 636 * conversions. So it's harmless to apply them universally - no implicit 637 * conversions will exist. If the types don't match, we'll receive false, 638 * and raise an error, satisfying the GLSL 1.50 spec, page 56: 639 * 640 * "The operand types must both be signed or unsigned." 641 */ 642 if (!apply_implicit_conversion(type_a, value_b, state) && 643 !apply_implicit_conversion(type_b, value_a, state)) { 644 _mesa_glsl_error(loc, state, 645 "could not implicitly convert operands to " 646 "modulus (%%) operator"); 647 return glsl_type::error_type; 648 } 649 type_a = value_a->type; 650 type_b = value_b->type; 651 652 /* "The operands cannot be vectors of differing size. If one operand is 653 * a scalar and the other vector, then the scalar is applied component- 654 * wise to the vector, resulting in the same type as the vector. If both 655 * are vectors of the same size, the result is computed component-wise." 656 */ 657 if (type_a->is_vector()) { 658 if (!type_b->is_vector() 659 || (type_a->vector_elements == type_b->vector_elements)) 660 return type_a; 661 } else 662 return type_b; 663 664 /* "The operator modulus (%) is not defined for any other data types 665 * (non-integer types)." 666 */ 667 _mesa_glsl_error(loc, state, "type mismatch"); 668 return glsl_type::error_type; 669 } 670 671 672 static const struct glsl_type * 673 relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b, 674 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 675 { 676 const glsl_type *type_a = value_a->type; 677 const glsl_type *type_b = value_b->type; 678 679 /* From GLSL 1.50 spec, page 56: 680 * "The relational operators greater than (>), less than (<), greater 681 * than or equal (>=), and less than or equal (<=) operate only on 682 * scalar integer and scalar floating-point expressions." 683 */ 684 if (!type_a->is_numeric() 685 || !type_b->is_numeric() 686 || !type_a->is_scalar() 687 || !type_b->is_scalar()) { 688 _mesa_glsl_error(loc, state, 689 "operands to relational operators must be scalar and " 690 "numeric"); 691 return glsl_type::error_type; 692 } 693 694 /* "Either the operands' types must match, or the conversions from 695 * Section 4.1.10 "Implicit Conversions" will be applied to the integer 696 * operand, after which the types must match." 697 */ 698 if (!apply_implicit_conversion(type_a, value_b, state) 699 && !apply_implicit_conversion(type_b, value_a, state)) { 700 _mesa_glsl_error(loc, state, 701 "could not implicitly convert operands to " 702 "relational operator"); 703 return glsl_type::error_type; 704 } 705 type_a = value_a->type; 706 type_b = value_b->type; 707 708 if (type_a->base_type != type_b->base_type) { 709 _mesa_glsl_error(loc, state, "base type mismatch"); 710 return glsl_type::error_type; 711 } 712 713 /* "The result is scalar Boolean." 714 */ 715 return glsl_type::bool_type; 716 } 717 718 /** 719 * \brief Return the result type of a bit-shift operation. 720 * 721 * If the given types to the bit-shift operator are invalid, return 722 * glsl_type::error_type. 723 * 724 * \param type_a Type of LHS of bit-shift op 725 * \param type_b Type of RHS of bit-shift op 726 */ 727 static const struct glsl_type * 728 shift_result_type(const struct glsl_type *type_a, 729 const struct glsl_type *type_b, 730 ast_operators op, 731 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 732 { 733 if (!state->check_bitwise_operations_allowed(loc)) { 734 return glsl_type::error_type; 735 } 736 737 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec: 738 * 739 * "The shift operators (<<) and (>>). For both operators, the operands 740 * must be signed or unsigned integers or integer vectors. One operand 741 * can be signed while the other is unsigned." 742 */ 743 if (!type_a->is_integer_32_64()) { 744 _mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or " 745 "integer vector", ast_expression::operator_string(op)); 746 return glsl_type::error_type; 747 748 } 749 if (!type_b->is_integer()) { 750 _mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or " 751 "integer vector", ast_expression::operator_string(op)); 752 return glsl_type::error_type; 753 } 754 755 /* "If the first operand is a scalar, the second operand has to be 756 * a scalar as well." 757 */ 758 if (type_a->is_scalar() && !type_b->is_scalar()) { 759 _mesa_glsl_error(loc, state, "if the first operand of %s is scalar, the " 760 "second must be scalar as well", 761 ast_expression::operator_string(op)); 762 return glsl_type::error_type; 763 } 764 765 /* If both operands are vectors, check that they have same number of 766 * elements. 767 */ 768 if (type_a->is_vector() && 769 type_b->is_vector() && 770 type_a->vector_elements != type_b->vector_elements) { 771 _mesa_glsl_error(loc, state, "vector operands to operator %s must " 772 "have same number of elements", 773 ast_expression::operator_string(op)); 774 return glsl_type::error_type; 775 } 776 777 /* "In all cases, the resulting type will be the same type as the left 778 * operand." 779 */ 780 return type_a; 781 } 782 783 /** 784 * Returns the innermost array index expression in an rvalue tree. 785 * This is the largest indexing level -- if an array of blocks, then 786 * it is the block index rather than an indexing expression for an 787 * array-typed member of an array of blocks. 788 */ 789 static ir_rvalue * 790 find_innermost_array_index(ir_rvalue *rv) 791 { 792 ir_dereference_array *last = NULL; 793 while (rv) { 794 if (rv->as_dereference_array()) { 795 last = rv->as_dereference_array(); 796 rv = last->array; 797 } else if (rv->as_dereference_record()) 798 rv = rv->as_dereference_record()->record; 799 else if (rv->as_swizzle()) 800 rv = rv->as_swizzle()->val; 801 else 802 rv = NULL; 803 } 804 805 if (last) 806 return last->array_index; 807 808 return NULL; 809 } 810 811 /** 812 * Validates that a value can be assigned to a location with a specified type 813 * 814 * Validates that \c rhs can be assigned to some location. If the types are 815 * not an exact match but an automatic conversion is possible, \c rhs will be 816 * converted. 817 * 818 * \return 819 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type. 820 * Otherwise the actual RHS to be assigned will be returned. This may be 821 * \c rhs, or it may be \c rhs after some type conversion. 822 * 823 * \note 824 * In addition to being used for assignments, this function is used to 825 * type-check return values. 826 */ 827 static ir_rvalue * 828 validate_assignment(struct _mesa_glsl_parse_state *state, 829 YYLTYPE loc, ir_rvalue *lhs, 830 ir_rvalue *rhs, bool is_initializer) 831 { 832 /* If there is already some error in the RHS, just return it. Anything 833 * else will lead to an avalanche of error message back to the user. 834 */ 835 if (rhs->type->is_error()) 836 return rhs; 837 838 /* In the Tessellation Control Shader: 839 * If a per-vertex output variable is used as an l-value, it is an error 840 * if the expression indicating the vertex number is not the identifier 841 * `gl_InvocationID`. 842 */ 843 if (state->stage == MESA_SHADER_TESS_CTRL && !lhs->type->is_error()) { 844 ir_variable *var = lhs->variable_referenced(); 845 if (var && var->data.mode == ir_var_shader_out && !var->data.patch) { 846 ir_rvalue *index = find_innermost_array_index(lhs); 847 ir_variable *index_var = index ? index->variable_referenced() : NULL; 848 if (!index_var || strcmp(index_var->name, "gl_InvocationID") != 0) { 849 _mesa_glsl_error(&loc, state, 850 "Tessellation control shader outputs can only " 851 "be indexed by gl_InvocationID"); 852 return NULL; 853 } 854 } 855 } 856 857 /* If the types are identical, the assignment can trivially proceed. 858 */ 859 if (rhs->type == lhs->type) 860 return rhs; 861 862 /* If the array element types are the same and the LHS is unsized, 863 * the assignment is okay for initializers embedded in variable 864 * declarations. 865 * 866 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this 867 * is handled by ir_dereference::is_lvalue. 868 */ 869 const glsl_type *lhs_t = lhs->type; 870 const glsl_type *rhs_t = rhs->type; 871 bool unsized_array = false; 872 while(lhs_t->is_array()) { 873 if (rhs_t == lhs_t) 874 break; /* the rest of the inner arrays match so break out early */ 875 if (!rhs_t->is_array()) { 876 unsized_array = false; 877 break; /* number of dimensions mismatch */ 878 } 879 if (lhs_t->length == rhs_t->length) { 880 lhs_t = lhs_t->fields.array; 881 rhs_t = rhs_t->fields.array; 882 continue; 883 } else if (lhs_t->is_unsized_array()) { 884 unsized_array = true; 885 } else { 886 unsized_array = false; 887 break; /* sized array mismatch */ 888 } 889 lhs_t = lhs_t->fields.array; 890 rhs_t = rhs_t->fields.array; 891 } 892 if (unsized_array) { 893 if (is_initializer) { 894 return rhs; 895 } else { 896 _mesa_glsl_error(&loc, state, 897 "implicitly sized arrays cannot be assigned"); 898 return NULL; 899 } 900 } 901 902 /* Check for implicit conversion in GLSL 1.20 */ 903 if (apply_implicit_conversion(lhs->type, rhs, state)) { 904 if (rhs->type == lhs->type) 905 return rhs; 906 } 907 908 _mesa_glsl_error(&loc, state, 909 "%s of type %s cannot be assigned to " 910 "variable of type %s", 911 is_initializer ? "initializer" : "value", 912 rhs->type->name, lhs->type->name); 913 914 return NULL; 915 } 916 917 static void 918 mark_whole_array_access(ir_rvalue *access) 919 { 920 ir_dereference_variable *deref = access->as_dereference_variable(); 921 922 if (deref && deref->var) { 923 deref->var->data.max_array_access = deref->type->length - 1; 924 } 925 } 926 927 static bool 928 do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state, 929 const char *non_lvalue_description, 930 ir_rvalue *lhs, ir_rvalue *rhs, 931 ir_rvalue **out_rvalue, bool needs_rvalue, 932 bool is_initializer, 933 YYLTYPE lhs_loc) 934 { 935 void *ctx = state; 936 bool error_emitted = (lhs->type->is_error() || rhs->type->is_error()); 937 938 ir_variable *lhs_var = lhs->variable_referenced(); 939 if (lhs_var) 940 lhs_var->data.assigned = true; 941 942 if (!error_emitted) { 943 if (non_lvalue_description != NULL) { 944 _mesa_glsl_error(&lhs_loc, state, 945 "assignment to %s", 946 non_lvalue_description); 947 error_emitted = true; 948 } else if (lhs_var != NULL && (lhs_var->data.read_only || 949 (lhs_var->data.mode == ir_var_shader_storage && 950 lhs_var->data.memory_read_only))) { 951 /* We can have memory_read_only set on both images and buffer variables, 952 * but in the former there is a distinction between assignments to 953 * the variable itself (read_only) and to the memory they point to 954 * (memory_read_only), while in the case of buffer variables there is 955 * no such distinction, that is why this check here is limited to 956 * buffer variables alone. 957 */ 958 _mesa_glsl_error(&lhs_loc, state, 959 "assignment to read-only variable '%s'", 960 lhs_var->name); 961 error_emitted = true; 962 } else if (lhs->type->is_array() && 963 !state->check_version(120, 300, &lhs_loc, 964 "whole array assignment forbidden")) { 965 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec: 966 * 967 * "Other binary or unary expressions, non-dereferenced 968 * arrays, function names, swizzles with repeated fields, 969 * and constants cannot be l-values." 970 * 971 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00. 972 */ 973 error_emitted = true; 974 } else if (!lhs->is_lvalue(state)) { 975 _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment"); 976 error_emitted = true; 977 } 978 } 979 980 ir_rvalue *new_rhs = 981 validate_assignment(state, lhs_loc, lhs, rhs, is_initializer); 982 if (new_rhs != NULL) { 983 rhs = new_rhs; 984 985 /* If the LHS array was not declared with a size, it takes it size from 986 * the RHS. If the LHS is an l-value and a whole array, it must be a 987 * dereference of a variable. Any other case would require that the LHS 988 * is either not an l-value or not a whole array. 989 */ 990 if (lhs->type->is_unsized_array()) { 991 ir_dereference *const d = lhs->as_dereference(); 992 993 assert(d != NULL); 994 995 ir_variable *const var = d->variable_referenced(); 996 997 assert(var != NULL); 998 999 if (var->data.max_array_access >= rhs->type->array_size()) { 1000 /* FINISHME: This should actually log the location of the RHS. */ 1001 _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to " 1002 "previous access", 1003 var->data.max_array_access); 1004 } 1005 1006 var->type = glsl_type::get_array_instance(lhs->type->fields.array, 1007 rhs->type->array_size()); 1008 d->type = var->type; 1009 } 1010 if (lhs->type->is_array()) { 1011 mark_whole_array_access(rhs); 1012 mark_whole_array_access(lhs); 1013 } 1014 } 1015 1016 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec, 1017 * but not post_inc) need the converted assigned value as an rvalue 1018 * to handle things like: 1019 * 1020 * i = j += 1; 1021 */ 1022 if (needs_rvalue) { 1023 ir_rvalue *rvalue; 1024 if (!error_emitted) { 1025 ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp", 1026 ir_var_temporary); 1027 instructions->push_tail(var); 1028 instructions->push_tail(assign(var, rhs)); 1029 1030 ir_dereference_variable *deref_var = 1031 new(ctx) ir_dereference_variable(var); 1032 instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var)); 1033 rvalue = new(ctx) ir_dereference_variable(var); 1034 } else { 1035 rvalue = ir_rvalue::error_value(ctx); 1036 } 1037 *out_rvalue = rvalue; 1038 } else { 1039 if (!error_emitted) 1040 instructions->push_tail(new(ctx) ir_assignment(lhs, rhs)); 1041 *out_rvalue = NULL; 1042 } 1043 1044 return error_emitted; 1045 } 1046 1047 static ir_rvalue * 1048 get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue) 1049 { 1050 void *ctx = ralloc_parent(lvalue); 1051 ir_variable *var; 1052 1053 var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp", 1054 ir_var_temporary); 1055 instructions->push_tail(var); 1056 1057 instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var), 1058 lvalue)); 1059 1060 return new(ctx) ir_dereference_variable(var); 1061 } 1062 1063 1064 ir_rvalue * 1065 ast_node::hir(exec_list *instructions, struct _mesa_glsl_parse_state *state) 1066 { 1067 (void) instructions; 1068 (void) state; 1069 1070 return NULL; 1071 } 1072 1073 bool 1074 ast_node::has_sequence_subexpression() const 1075 { 1076 return false; 1077 } 1078 1079 void 1080 ast_node::set_is_lhs(bool /* new_value */) 1081 { 1082 } 1083 1084 void 1085 ast_function_expression::hir_no_rvalue(exec_list *instructions, 1086 struct _mesa_glsl_parse_state *state) 1087 { 1088 (void)hir(instructions, state); 1089 } 1090 1091 void 1092 ast_aggregate_initializer::hir_no_rvalue(exec_list *instructions, 1093 struct _mesa_glsl_parse_state *state) 1094 { 1095 (void)hir(instructions, state); 1096 } 1097 1098 static ir_rvalue * 1099 do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1) 1100 { 1101 int join_op; 1102 ir_rvalue *cmp = NULL; 1103 1104 if (operation == ir_binop_all_equal) 1105 join_op = ir_binop_logic_and; 1106 else 1107 join_op = ir_binop_logic_or; 1108 1109 switch (op0->type->base_type) { 1110 case GLSL_TYPE_FLOAT: 1111 case GLSL_TYPE_FLOAT16: 1112 case GLSL_TYPE_UINT: 1113 case GLSL_TYPE_INT: 1114 case GLSL_TYPE_BOOL: 1115 case GLSL_TYPE_DOUBLE: 1116 case GLSL_TYPE_UINT64: 1117 case GLSL_TYPE_INT64: 1118 case GLSL_TYPE_UINT16: 1119 case GLSL_TYPE_INT16: 1120 return new(mem_ctx) ir_expression(operation, op0, op1); 1121 1122 case GLSL_TYPE_ARRAY: { 1123 for (unsigned int i = 0; i < op0->type->length; i++) { 1124 ir_rvalue *e0, *e1, *result; 1125 1126 e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL), 1127 new(mem_ctx) ir_constant(i)); 1128 e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL), 1129 new(mem_ctx) ir_constant(i)); 1130 result = do_comparison(mem_ctx, operation, e0, e1); 1131 1132 if (cmp) { 1133 cmp = new(mem_ctx) ir_expression(join_op, cmp, result); 1134 } else { 1135 cmp = result; 1136 } 1137 } 1138 1139 mark_whole_array_access(op0); 1140 mark_whole_array_access(op1); 1141 break; 1142 } 1143 1144 case GLSL_TYPE_STRUCT: { 1145 for (unsigned int i = 0; i < op0->type->length; i++) { 1146 ir_rvalue *e0, *e1, *result; 1147 const char *field_name = op0->type->fields.structure[i].name; 1148 1149 e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL), 1150 field_name); 1151 e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL), 1152 field_name); 1153 result = do_comparison(mem_ctx, operation, e0, e1); 1154 1155 if (cmp) { 1156 cmp = new(mem_ctx) ir_expression(join_op, cmp, result); 1157 } else { 1158 cmp = result; 1159 } 1160 } 1161 break; 1162 } 1163 1164 case GLSL_TYPE_ERROR: 1165 case GLSL_TYPE_VOID: 1166 case GLSL_TYPE_SAMPLER: 1167 case GLSL_TYPE_IMAGE: 1168 case GLSL_TYPE_INTERFACE: 1169 case GLSL_TYPE_ATOMIC_UINT: 1170 case GLSL_TYPE_SUBROUTINE: 1171 case GLSL_TYPE_FUNCTION: 1172 /* I assume a comparison of a struct containing a sampler just 1173 * ignores the sampler present in the type. 1174 */ 1175 break; 1176 } 1177 1178 if (cmp == NULL) 1179 cmp = new(mem_ctx) ir_constant(true); 1180 1181 return cmp; 1182 } 1183 1184 /* For logical operations, we want to ensure that the operands are 1185 * scalar booleans. If it isn't, emit an error and return a constant 1186 * boolean to avoid triggering cascading error messages. 1187 */ 1188 static ir_rvalue * 1189 get_scalar_boolean_operand(exec_list *instructions, 1190 struct _mesa_glsl_parse_state *state, 1191 ast_expression *parent_expr, 1192 int operand, 1193 const char *operand_name, 1194 bool *error_emitted) 1195 { 1196 ast_expression *expr = parent_expr->subexpressions[operand]; 1197 void *ctx = state; 1198 ir_rvalue *val = expr->hir(instructions, state); 1199 1200 if (val->type->is_boolean() && val->type->is_scalar()) 1201 return val; 1202 1203 if (!*error_emitted) { 1204 YYLTYPE loc = expr->get_location(); 1205 _mesa_glsl_error(&loc, state, "%s of `%s' must be scalar boolean", 1206 operand_name, 1207 parent_expr->operator_string(parent_expr->oper)); 1208 *error_emitted = true; 1209 } 1210 1211 return new(ctx) ir_constant(true); 1212 } 1213 1214 /** 1215 * If name refers to a builtin array whose maximum allowed size is less than 1216 * size, report an error and return true. Otherwise return false. 1217 */ 1218 void 1219 check_builtin_array_max_size(const char *name, unsigned size, 1220 YYLTYPE loc, struct _mesa_glsl_parse_state *state) 1221 { 1222 if ((strcmp("gl_TexCoord", name) == 0) 1223 && (size > state->Const.MaxTextureCoords)) { 1224 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec: 1225 * 1226 * "The size [of gl_TexCoord] can be at most 1227 * gl_MaxTextureCoords." 1228 */ 1229 _mesa_glsl_error(&loc, state, "`gl_TexCoord' array size cannot " 1230 "be larger than gl_MaxTextureCoords (%u)", 1231 state->Const.MaxTextureCoords); 1232 } else if (strcmp("gl_ClipDistance", name) == 0) { 1233 state->clip_dist_size = size; 1234 if (size + state->cull_dist_size > state->Const.MaxClipPlanes) { 1235 /* From section 7.1 (Vertex Shader Special Variables) of the 1236 * GLSL 1.30 spec: 1237 * 1238 * "The gl_ClipDistance array is predeclared as unsized and 1239 * must be sized by the shader either redeclaring it with a 1240 * size or indexing it only with integral constant 1241 * expressions. ... The size can be at most 1242 * gl_MaxClipDistances." 1243 */ 1244 _mesa_glsl_error(&loc, state, "`gl_ClipDistance' array size cannot " 1245 "be larger than gl_MaxClipDistances (%u)", 1246 state->Const.MaxClipPlanes); 1247 } 1248 } else if (strcmp("gl_CullDistance", name) == 0) { 1249 state->cull_dist_size = size; 1250 if (size + state->clip_dist_size > state->Const.MaxClipPlanes) { 1251 /* From the ARB_cull_distance spec: 1252 * 1253 * "The gl_CullDistance array is predeclared as unsized and 1254 * must be sized by the shader either redeclaring it with 1255 * a size or indexing it only with integral constant 1256 * expressions. The size determines the number and set of 1257 * enabled cull distances and can be at most 1258 * gl_MaxCullDistances." 1259 */ 1260 _mesa_glsl_error(&loc, state, "`gl_CullDistance' array size cannot " 1261 "be larger than gl_MaxCullDistances (%u)", 1262 state->Const.MaxClipPlanes); 1263 } 1264 } 1265 } 1266 1267 /** 1268 * Create the constant 1, of a which is appropriate for incrementing and 1269 * decrementing values of the given GLSL type. For example, if type is vec4, 1270 * this creates a constant value of 1.0 having type float. 1271 * 1272 * If the given type is invalid for increment and decrement operators, return 1273 * a floating point 1--the error will be detected later. 1274 */ 1275 static ir_rvalue * 1276 constant_one_for_inc_dec(void *ctx, const glsl_type *type) 1277 { 1278 switch (type->base_type) { 1279 case GLSL_TYPE_UINT: 1280 return new(ctx) ir_constant((unsigned) 1); 1281 case GLSL_TYPE_INT: 1282 return new(ctx) ir_constant(1); 1283 case GLSL_TYPE_UINT64: 1284 return new(ctx) ir_constant((uint64_t) 1); 1285 case GLSL_TYPE_INT64: 1286 return new(ctx) ir_constant((int64_t) 1); 1287 default: 1288 case GLSL_TYPE_FLOAT: 1289 return new(ctx) ir_constant(1.0f); 1290 } 1291 } 1292 1293 ir_rvalue * 1294 ast_expression::hir(exec_list *instructions, 1295 struct _mesa_glsl_parse_state *state) 1296 { 1297 return do_hir(instructions, state, true); 1298 } 1299 1300 void 1301 ast_expression::hir_no_rvalue(exec_list *instructions, 1302 struct _mesa_glsl_parse_state *state) 1303 { 1304 do_hir(instructions, state, false); 1305 } 1306 1307 void 1308 ast_expression::set_is_lhs(bool new_value) 1309 { 1310 /* is_lhs is tracked only to print "variable used uninitialized" warnings, 1311 * if we lack an identifier we can just skip it. 1312 */ 1313 if (this->primary_expression.identifier == NULL) 1314 return; 1315 1316 this->is_lhs = new_value; 1317 1318 /* We need to go through the subexpressions tree to cover cases like 1319 * ast_field_selection 1320 */ 1321 if (this->subexpressions[0] != NULL) 1322 this->subexpressions[0]->set_is_lhs(new_value); 1323 } 1324 1325 ir_rvalue * 1326 ast_expression::do_hir(exec_list *instructions, 1327 struct _mesa_glsl_parse_state *state, 1328 bool needs_rvalue) 1329 { 1330 void *ctx = state; 1331 static const int operations[AST_NUM_OPERATORS] = { 1332 -1, /* ast_assign doesn't convert to ir_expression. */ 1333 -1, /* ast_plus doesn't convert to ir_expression. */ 1334 ir_unop_neg, 1335 ir_binop_add, 1336 ir_binop_sub, 1337 ir_binop_mul, 1338 ir_binop_div, 1339 ir_binop_mod, 1340 ir_binop_lshift, 1341 ir_binop_rshift, 1342 ir_binop_less, 1343 ir_binop_less, /* This is correct. See the ast_greater case below. */ 1344 ir_binop_gequal, /* This is correct. See the ast_lequal case below. */ 1345 ir_binop_gequal, 1346 ir_binop_all_equal, 1347 ir_binop_any_nequal, 1348 ir_binop_bit_and, 1349 ir_binop_bit_xor, 1350 ir_binop_bit_or, 1351 ir_unop_bit_not, 1352 ir_binop_logic_and, 1353 ir_binop_logic_xor, 1354 ir_binop_logic_or, 1355 ir_unop_logic_not, 1356 1357 /* Note: The following block of expression types actually convert 1358 * to multiple IR instructions. 1359 */ 1360 ir_binop_mul, /* ast_mul_assign */ 1361 ir_binop_div, /* ast_div_assign */ 1362 ir_binop_mod, /* ast_mod_assign */ 1363 ir_binop_add, /* ast_add_assign */ 1364 ir_binop_sub, /* ast_sub_assign */ 1365 ir_binop_lshift, /* ast_ls_assign */ 1366 ir_binop_rshift, /* ast_rs_assign */ 1367 ir_binop_bit_and, /* ast_and_assign */ 1368 ir_binop_bit_xor, /* ast_xor_assign */ 1369 ir_binop_bit_or, /* ast_or_assign */ 1370 1371 -1, /* ast_conditional doesn't convert to ir_expression. */ 1372 ir_binop_add, /* ast_pre_inc. */ 1373 ir_binop_sub, /* ast_pre_dec. */ 1374 ir_binop_add, /* ast_post_inc. */ 1375 ir_binop_sub, /* ast_post_dec. */ 1376 -1, /* ast_field_selection doesn't conv to ir_expression. */ 1377 -1, /* ast_array_index doesn't convert to ir_expression. */ 1378 -1, /* ast_function_call doesn't conv to ir_expression. */ 1379 -1, /* ast_identifier doesn't convert to ir_expression. */ 1380 -1, /* ast_int_constant doesn't convert to ir_expression. */ 1381 -1, /* ast_uint_constant doesn't conv to ir_expression. */ 1382 -1, /* ast_float_constant doesn't conv to ir_expression. */ 1383 -1, /* ast_bool_constant doesn't conv to ir_expression. */ 1384 -1, /* ast_sequence doesn't convert to ir_expression. */ 1385 -1, /* ast_aggregate shouldn't ever even get here. */ 1386 }; 1387 ir_rvalue *result = NULL; 1388 ir_rvalue *op[3]; 1389 const struct glsl_type *type, *orig_type; 1390 bool error_emitted = false; 1391 YYLTYPE loc; 1392 1393 loc = this->get_location(); 1394 1395 switch (this->oper) { 1396 case ast_aggregate: 1397 assert(!"ast_aggregate: Should never get here."); 1398 break; 1399 1400 case ast_assign: { 1401 this->subexpressions[0]->set_is_lhs(true); 1402 op[0] = this->subexpressions[0]->hir(instructions, state); 1403 op[1] = this->subexpressions[1]->hir(instructions, state); 1404 1405 error_emitted = 1406 do_assignment(instructions, state, 1407 this->subexpressions[0]->non_lvalue_description, 1408 op[0], op[1], &result, needs_rvalue, false, 1409 this->subexpressions[0]->get_location()); 1410 break; 1411 } 1412 1413 case ast_plus: 1414 op[0] = this->subexpressions[0]->hir(instructions, state); 1415 1416 type = unary_arithmetic_result_type(op[0]->type, state, & loc); 1417 1418 error_emitted = type->is_error(); 1419 1420 result = op[0]; 1421 break; 1422 1423 case ast_neg: 1424 op[0] = this->subexpressions[0]->hir(instructions, state); 1425 1426 type = unary_arithmetic_result_type(op[0]->type, state, & loc); 1427 1428 error_emitted = type->is_error(); 1429 1430 result = new(ctx) ir_expression(operations[this->oper], type, 1431 op[0], NULL); 1432 break; 1433 1434 case ast_add: 1435 case ast_sub: 1436 case ast_mul: 1437 case ast_div: 1438 op[0] = this->subexpressions[0]->hir(instructions, state); 1439 op[1] = this->subexpressions[1]->hir(instructions, state); 1440 1441 type = arithmetic_result_type(op[0], op[1], 1442 (this->oper == ast_mul), 1443 state, & loc); 1444 error_emitted = type->is_error(); 1445 1446 result = new(ctx) ir_expression(operations[this->oper], type, 1447 op[0], op[1]); 1448 break; 1449 1450 case ast_mod: 1451 op[0] = this->subexpressions[0]->hir(instructions, state); 1452 op[1] = this->subexpressions[1]->hir(instructions, state); 1453 1454 type = modulus_result_type(op[0], op[1], state, &loc); 1455 1456 assert(operations[this->oper] == ir_binop_mod); 1457 1458 result = new(ctx) ir_expression(operations[this->oper], type, 1459 op[0], op[1]); 1460 error_emitted = type->is_error(); 1461 break; 1462 1463 case ast_lshift: 1464 case ast_rshift: 1465 if (!state->check_bitwise_operations_allowed(&loc)) { 1466 error_emitted = true; 1467 } 1468 1469 op[0] = this->subexpressions[0]->hir(instructions, state); 1470 op[1] = this->subexpressions[1]->hir(instructions, state); 1471 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state, 1472 &loc); 1473 result = new(ctx) ir_expression(operations[this->oper], type, 1474 op[0], op[1]); 1475 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1476 break; 1477 1478 case ast_less: 1479 case ast_greater: 1480 case ast_lequal: 1481 case ast_gequal: 1482 op[0] = this->subexpressions[0]->hir(instructions, state); 1483 op[1] = this->subexpressions[1]->hir(instructions, state); 1484 1485 type = relational_result_type(op[0], op[1], state, & loc); 1486 1487 /* The relational operators must either generate an error or result 1488 * in a scalar boolean. See page 57 of the GLSL 1.50 spec. 1489 */ 1490 assert(type->is_error() 1491 || (type->is_boolean() && type->is_scalar())); 1492 1493 /* Like NIR, GLSL IR does not have opcodes for > or <=. Instead, swap 1494 * the arguments and use < or >=. 1495 */ 1496 if (this->oper == ast_greater || this->oper == ast_lequal) { 1497 ir_rvalue *const tmp = op[0]; 1498 op[0] = op[1]; 1499 op[1] = tmp; 1500 } 1501 1502 result = new(ctx) ir_expression(operations[this->oper], type, 1503 op[0], op[1]); 1504 error_emitted = type->is_error(); 1505 break; 1506 1507 case ast_nequal: 1508 case ast_equal: 1509 op[0] = this->subexpressions[0]->hir(instructions, state); 1510 op[1] = this->subexpressions[1]->hir(instructions, state); 1511 1512 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec: 1513 * 1514 * "The equality operators equal (==), and not equal (!=) 1515 * operate on all types. They result in a scalar Boolean. If 1516 * the operand types do not match, then there must be a 1517 * conversion from Section 4.1.10 "Implicit Conversions" 1518 * applied to one operand that can make them match, in which 1519 * case this conversion is done." 1520 */ 1521 1522 if (op[0]->type == glsl_type::void_type || op[1]->type == glsl_type::void_type) { 1523 _mesa_glsl_error(& loc, state, "`%s': wrong operand types: " 1524 "no operation `%1$s' exists that takes a left-hand " 1525 "operand of type 'void' or a right operand of type " 1526 "'void'", (this->oper == ast_equal) ? "==" : "!="); 1527 error_emitted = true; 1528 } else if ((!apply_implicit_conversion(op[0]->type, op[1], state) 1529 && !apply_implicit_conversion(op[1]->type, op[0], state)) 1530 || (op[0]->type != op[1]->type)) { 1531 _mesa_glsl_error(& loc, state, "operands of `%s' must have the same " 1532 "type", (this->oper == ast_equal) ? "==" : "!="); 1533 error_emitted = true; 1534 } else if ((op[0]->type->is_array() || op[1]->type->is_array()) && 1535 !state->check_version(120, 300, &loc, 1536 "array comparisons forbidden")) { 1537 error_emitted = true; 1538 } else if ((op[0]->type->contains_subroutine() || 1539 op[1]->type->contains_subroutine())) { 1540 _mesa_glsl_error(&loc, state, "subroutine comparisons forbidden"); 1541 error_emitted = true; 1542 } else if ((op[0]->type->contains_opaque() || 1543 op[1]->type->contains_opaque())) { 1544 _mesa_glsl_error(&loc, state, "opaque type comparisons forbidden"); 1545 error_emitted = true; 1546 } 1547 1548 if (error_emitted) { 1549 result = new(ctx) ir_constant(false); 1550 } else { 1551 result = do_comparison(ctx, operations[this->oper], op[0], op[1]); 1552 assert(result->type == glsl_type::bool_type); 1553 } 1554 break; 1555 1556 case ast_bit_and: 1557 case ast_bit_xor: 1558 case ast_bit_or: 1559 op[0] = this->subexpressions[0]->hir(instructions, state); 1560 op[1] = this->subexpressions[1]->hir(instructions, state); 1561 type = bit_logic_result_type(op[0], op[1], this->oper, state, &loc); 1562 result = new(ctx) ir_expression(operations[this->oper], type, 1563 op[0], op[1]); 1564 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1565 break; 1566 1567 case ast_bit_not: 1568 op[0] = this->subexpressions[0]->hir(instructions, state); 1569 1570 if (!state->check_bitwise_operations_allowed(&loc)) { 1571 error_emitted = true; 1572 } 1573 1574 if (!op[0]->type->is_integer_32_64()) { 1575 _mesa_glsl_error(&loc, state, "operand of `~' must be an integer"); 1576 error_emitted = true; 1577 } 1578 1579 type = error_emitted ? glsl_type::error_type : op[0]->type; 1580 result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL); 1581 break; 1582 1583 case ast_logic_and: { 1584 exec_list rhs_instructions; 1585 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, 1586 "LHS", &error_emitted); 1587 op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1, 1588 "RHS", &error_emitted); 1589 1590 if (rhs_instructions.is_empty()) { 1591 result = new(ctx) ir_expression(ir_binop_logic_and, op[0], op[1]); 1592 } else { 1593 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type, 1594 "and_tmp", 1595 ir_var_temporary); 1596 instructions->push_tail(tmp); 1597 1598 ir_if *const stmt = new(ctx) ir_if(op[0]); 1599 instructions->push_tail(stmt); 1600 1601 stmt->then_instructions.append_list(&rhs_instructions); 1602 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp); 1603 ir_assignment *const then_assign = 1604 new(ctx) ir_assignment(then_deref, op[1]); 1605 stmt->then_instructions.push_tail(then_assign); 1606 1607 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp); 1608 ir_assignment *const else_assign = 1609 new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false)); 1610 stmt->else_instructions.push_tail(else_assign); 1611 1612 result = new(ctx) ir_dereference_variable(tmp); 1613 } 1614 break; 1615 } 1616 1617 case ast_logic_or: { 1618 exec_list rhs_instructions; 1619 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, 1620 "LHS", &error_emitted); 1621 op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1, 1622 "RHS", &error_emitted); 1623 1624 if (rhs_instructions.is_empty()) { 1625 result = new(ctx) ir_expression(ir_binop_logic_or, op[0], op[1]); 1626 } else { 1627 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type, 1628 "or_tmp", 1629 ir_var_temporary); 1630 instructions->push_tail(tmp); 1631 1632 ir_if *const stmt = new(ctx) ir_if(op[0]); 1633 instructions->push_tail(stmt); 1634 1635 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp); 1636 ir_assignment *const then_assign = 1637 new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true)); 1638 stmt->then_instructions.push_tail(then_assign); 1639 1640 stmt->else_instructions.append_list(&rhs_instructions); 1641 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp); 1642 ir_assignment *const else_assign = 1643 new(ctx) ir_assignment(else_deref, op[1]); 1644 stmt->else_instructions.push_tail(else_assign); 1645 1646 result = new(ctx) ir_dereference_variable(tmp); 1647 } 1648 break; 1649 } 1650 1651 case ast_logic_xor: 1652 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec: 1653 * 1654 * "The logical binary operators and (&&), or ( | | ), and 1655 * exclusive or (^^). They operate only on two Boolean 1656 * expressions and result in a Boolean expression." 1657 */ 1658 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, "LHS", 1659 &error_emitted); 1660 op[1] = get_scalar_boolean_operand(instructions, state, this, 1, "RHS", 1661 &error_emitted); 1662 1663 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type, 1664 op[0], op[1]); 1665 break; 1666 1667 case ast_logic_not: 1668 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, 1669 "operand", &error_emitted); 1670 1671 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type, 1672 op[0], NULL); 1673 break; 1674 1675 case ast_mul_assign: 1676 case ast_div_assign: 1677 case ast_add_assign: 1678 case ast_sub_assign: { 1679 this->subexpressions[0]->set_is_lhs(true); 1680 op[0] = this->subexpressions[0]->hir(instructions, state); 1681 op[1] = this->subexpressions[1]->hir(instructions, state); 1682 1683 orig_type = op[0]->type; 1684 type = arithmetic_result_type(op[0], op[1], 1685 (this->oper == ast_mul_assign), 1686 state, & loc); 1687 1688 if (type != orig_type) { 1689 _mesa_glsl_error(& loc, state, 1690 "could not implicitly convert " 1691 "%s to %s", type->name, orig_type->name); 1692 type = glsl_type::error_type; 1693 } 1694 1695 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1696 op[0], op[1]); 1697 1698 error_emitted = 1699 do_assignment(instructions, state, 1700 this->subexpressions[0]->non_lvalue_description, 1701 op[0]->clone(ctx, NULL), temp_rhs, 1702 &result, needs_rvalue, false, 1703 this->subexpressions[0]->get_location()); 1704 1705 /* GLSL 1.10 does not allow array assignment. However, we don't have to 1706 * explicitly test for this because none of the binary expression 1707 * operators allow array operands either. 1708 */ 1709 1710 break; 1711 } 1712 1713 case ast_mod_assign: { 1714 this->subexpressions[0]->set_is_lhs(true); 1715 op[0] = this->subexpressions[0]->hir(instructions, state); 1716 op[1] = this->subexpressions[1]->hir(instructions, state); 1717 1718 orig_type = op[0]->type; 1719 type = modulus_result_type(op[0], op[1], state, &loc); 1720 1721 if (type != orig_type) { 1722 _mesa_glsl_error(& loc, state, 1723 "could not implicitly convert " 1724 "%s to %s", type->name, orig_type->name); 1725 type = glsl_type::error_type; 1726 } 1727 1728 assert(operations[this->oper] == ir_binop_mod); 1729 1730 ir_rvalue *temp_rhs; 1731 temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1732 op[0], op[1]); 1733 1734 error_emitted = 1735 do_assignment(instructions, state, 1736 this->subexpressions[0]->non_lvalue_description, 1737 op[0]->clone(ctx, NULL), temp_rhs, 1738 &result, needs_rvalue, false, 1739 this->subexpressions[0]->get_location()); 1740 break; 1741 } 1742 1743 case ast_ls_assign: 1744 case ast_rs_assign: { 1745 this->subexpressions[0]->set_is_lhs(true); 1746 op[0] = this->subexpressions[0]->hir(instructions, state); 1747 op[1] = this->subexpressions[1]->hir(instructions, state); 1748 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state, 1749 &loc); 1750 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], 1751 type, op[0], op[1]); 1752 error_emitted = 1753 do_assignment(instructions, state, 1754 this->subexpressions[0]->non_lvalue_description, 1755 op[0]->clone(ctx, NULL), temp_rhs, 1756 &result, needs_rvalue, false, 1757 this->subexpressions[0]->get_location()); 1758 break; 1759 } 1760 1761 case ast_and_assign: 1762 case ast_xor_assign: 1763 case ast_or_assign: { 1764 this->subexpressions[0]->set_is_lhs(true); 1765 op[0] = this->subexpressions[0]->hir(instructions, state); 1766 op[1] = this->subexpressions[1]->hir(instructions, state); 1767 1768 orig_type = op[0]->type; 1769 type = bit_logic_result_type(op[0], op[1], this->oper, state, &loc); 1770 1771 if (type != orig_type) { 1772 _mesa_glsl_error(& loc, state, 1773 "could not implicitly convert " 1774 "%s to %s", type->name, orig_type->name); 1775 type = glsl_type::error_type; 1776 } 1777 1778 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], 1779 type, op[0], op[1]); 1780 error_emitted = 1781 do_assignment(instructions, state, 1782 this->subexpressions[0]->non_lvalue_description, 1783 op[0]->clone(ctx, NULL), temp_rhs, 1784 &result, needs_rvalue, false, 1785 this->subexpressions[0]->get_location()); 1786 break; 1787 } 1788 1789 case ast_conditional: { 1790 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec: 1791 * 1792 * "The ternary selection operator (?:). It operates on three 1793 * expressions (exp1 ? exp2 : exp3). This operator evaluates the 1794 * first expression, which must result in a scalar Boolean." 1795 */ 1796 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, 1797 "condition", &error_emitted); 1798 1799 /* The :? operator is implemented by generating an anonymous temporary 1800 * followed by an if-statement. The last instruction in each branch of 1801 * the if-statement assigns a value to the anonymous temporary. This 1802 * temporary is the r-value of the expression. 1803 */ 1804 exec_list then_instructions; 1805 exec_list else_instructions; 1806 1807 op[1] = this->subexpressions[1]->hir(&then_instructions, state); 1808 op[2] = this->subexpressions[2]->hir(&else_instructions, state); 1809 1810 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec: 1811 * 1812 * "The second and third expressions can be any type, as 1813 * long their types match, or there is a conversion in 1814 * Section 4.1.10 "Implicit Conversions" that can be applied 1815 * to one of the expressions to make their types match. This 1816 * resulting matching type is the type of the entire 1817 * expression." 1818 */ 1819 if ((!apply_implicit_conversion(op[1]->type, op[2], state) 1820 && !apply_implicit_conversion(op[2]->type, op[1], state)) 1821 || (op[1]->type != op[2]->type)) { 1822 YYLTYPE loc = this->subexpressions[1]->get_location(); 1823 1824 _mesa_glsl_error(& loc, state, "second and third operands of ?: " 1825 "operator must have matching types"); 1826 error_emitted = true; 1827 type = glsl_type::error_type; 1828 } else { 1829 type = op[1]->type; 1830 } 1831 1832 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec: 1833 * 1834 * "The second and third expressions must be the same type, but can 1835 * be of any type other than an array." 1836 */ 1837 if (type->is_array() && 1838 !state->check_version(120, 300, &loc, 1839 "second and third operands of ?: operator " 1840 "cannot be arrays")) { 1841 error_emitted = true; 1842 } 1843 1844 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types): 1845 * 1846 * "Except for array indexing, structure member selection, and 1847 * parentheses, opaque variables are not allowed to be operands in 1848 * expressions; such use results in a compile-time error." 1849 */ 1850 if (type->contains_opaque()) { 1851 _mesa_glsl_error(&loc, state, "opaque variables cannot be operands " 1852 "of the ?: operator"); 1853 error_emitted = true; 1854 } 1855 1856 ir_constant *cond_val = op[0]->constant_expression_value(ctx); 1857 1858 if (then_instructions.is_empty() 1859 && else_instructions.is_empty() 1860 && cond_val != NULL) { 1861 result = cond_val->value.b[0] ? op[1] : op[2]; 1862 } else { 1863 /* The copy to conditional_tmp reads the whole array. */ 1864 if (type->is_array()) { 1865 mark_whole_array_access(op[1]); 1866 mark_whole_array_access(op[2]); 1867 } 1868 1869 ir_variable *const tmp = 1870 new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary); 1871 instructions->push_tail(tmp); 1872 1873 ir_if *const stmt = new(ctx) ir_if(op[0]); 1874 instructions->push_tail(stmt); 1875 1876 then_instructions.move_nodes_to(& stmt->then_instructions); 1877 ir_dereference *const then_deref = 1878 new(ctx) ir_dereference_variable(tmp); 1879 ir_assignment *const then_assign = 1880 new(ctx) ir_assignment(then_deref, op[1]); 1881 stmt->then_instructions.push_tail(then_assign); 1882 1883 else_instructions.move_nodes_to(& stmt->else_instructions); 1884 ir_dereference *const else_deref = 1885 new(ctx) ir_dereference_variable(tmp); 1886 ir_assignment *const else_assign = 1887 new(ctx) ir_assignment(else_deref, op[2]); 1888 stmt->else_instructions.push_tail(else_assign); 1889 1890 result = new(ctx) ir_dereference_variable(tmp); 1891 } 1892 break; 1893 } 1894 1895 case ast_pre_inc: 1896 case ast_pre_dec: { 1897 this->non_lvalue_description = (this->oper == ast_pre_inc) 1898 ? "pre-increment operation" : "pre-decrement operation"; 1899 1900 op[0] = this->subexpressions[0]->hir(instructions, state); 1901 op[1] = constant_one_for_inc_dec(ctx, op[0]->type); 1902 1903 type = arithmetic_result_type(op[0], op[1], false, state, & loc); 1904 1905 ir_rvalue *temp_rhs; 1906 temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1907 op[0], op[1]); 1908 1909 error_emitted = 1910 do_assignment(instructions, state, 1911 this->subexpressions[0]->non_lvalue_description, 1912 op[0]->clone(ctx, NULL), temp_rhs, 1913 &result, needs_rvalue, false, 1914 this->subexpressions[0]->get_location()); 1915 break; 1916 } 1917 1918 case ast_post_inc: 1919 case ast_post_dec: { 1920 this->non_lvalue_description = (this->oper == ast_post_inc) 1921 ? "post-increment operation" : "post-decrement operation"; 1922 op[0] = this->subexpressions[0]->hir(instructions, state); 1923 op[1] = constant_one_for_inc_dec(ctx, op[0]->type); 1924 1925 error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); 1926 1927 type = arithmetic_result_type(op[0], op[1], false, state, & loc); 1928 1929 ir_rvalue *temp_rhs; 1930 temp_rhs = new(ctx) ir_expression(operations[this->oper], type, 1931 op[0], op[1]); 1932 1933 /* Get a temporary of a copy of the lvalue before it's modified. 1934 * This may get thrown away later. 1935 */ 1936 result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL)); 1937 1938 ir_rvalue *junk_rvalue; 1939 error_emitted = 1940 do_assignment(instructions, state, 1941 this->subexpressions[0]->non_lvalue_description, 1942 op[0]->clone(ctx, NULL), temp_rhs, 1943 &junk_rvalue, false, false, 1944 this->subexpressions[0]->get_location()); 1945 1946 break; 1947 } 1948 1949 case ast_field_selection: 1950 result = _mesa_ast_field_selection_to_hir(this, instructions, state); 1951 break; 1952 1953 case ast_array_index: { 1954 YYLTYPE index_loc = subexpressions[1]->get_location(); 1955 1956 /* Getting if an array is being used uninitialized is beyond what we get 1957 * from ir_value.data.assigned. Setting is_lhs as true would force to 1958 * not raise a uninitialized warning when using an array 1959 */ 1960 subexpressions[0]->set_is_lhs(true); 1961 op[0] = subexpressions[0]->hir(instructions, state); 1962 op[1] = subexpressions[1]->hir(instructions, state); 1963 1964 result = _mesa_ast_array_index_to_hir(ctx, state, op[0], op[1], 1965 loc, index_loc); 1966 1967 if (result->type->is_error()) 1968 error_emitted = true; 1969 1970 break; 1971 } 1972 1973 case ast_unsized_array_dim: 1974 assert(!"ast_unsized_array_dim: Should never get here."); 1975 break; 1976 1977 case ast_function_call: 1978 /* Should *NEVER* get here. ast_function_call should always be handled 1979 * by ast_function_expression::hir. 1980 */ 1981 assert(0); 1982 break; 1983 1984 case ast_identifier: { 1985 /* ast_identifier can appear several places in a full abstract syntax 1986 * tree. This particular use must be at location specified in the grammar 1987 * as 'variable_identifier'. 1988 */ 1989 ir_variable *var = 1990 state->symbols->get_variable(this->primary_expression.identifier); 1991 1992 if (var == NULL) { 1993 /* the identifier might be a subroutine name */ 1994 char *sub_name; 1995 sub_name = ralloc_asprintf(ctx, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state->stage), this->primary_expression.identifier); 1996 var = state->symbols->get_variable(sub_name); 1997 ralloc_free(sub_name); 1998 } 1999 2000 if (var != NULL) { 2001 var->data.used = true; 2002 result = new(ctx) ir_dereference_variable(var); 2003 2004 if ((var->data.mode == ir_var_auto || var->data.mode == ir_var_shader_out) 2005 && !this->is_lhs 2006 && result->variable_referenced()->data.assigned != true 2007 && !is_gl_identifier(var->name)) { 2008 _mesa_glsl_warning(&loc, state, "`%s' used uninitialized", 2009 this->primary_expression.identifier); 2010 } 2011 } else { 2012 _mesa_glsl_error(& loc, state, "`%s' undeclared", 2013 this->primary_expression.identifier); 2014 2015 result = ir_rvalue::error_value(ctx); 2016 error_emitted = true; 2017 } 2018 break; 2019 } 2020 2021 case ast_int_constant: 2022 result = new(ctx) ir_constant(this->primary_expression.int_constant); 2023 break; 2024 2025 case ast_uint_constant: 2026 result = new(ctx) ir_constant(this->primary_expression.uint_constant); 2027 break; 2028 2029 case ast_float_constant: 2030 result = new(ctx) ir_constant(this->primary_expression.float_constant); 2031 break; 2032 2033 case ast_bool_constant: 2034 result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant)); 2035 break; 2036 2037 case ast_double_constant: 2038 result = new(ctx) ir_constant(this->primary_expression.double_constant); 2039 break; 2040 2041 case ast_uint64_constant: 2042 result = new(ctx) ir_constant(this->primary_expression.uint64_constant); 2043 break; 2044 2045 case ast_int64_constant: 2046 result = new(ctx) ir_constant(this->primary_expression.int64_constant); 2047 break; 2048 2049 case ast_sequence: { 2050 /* It should not be possible to generate a sequence in the AST without 2051 * any expressions in it. 2052 */ 2053 assert(!this->expressions.is_empty()); 2054 2055 /* The r-value of a sequence is the last expression in the sequence. If 2056 * the other expressions in the sequence do not have side-effects (and 2057 * therefore add instructions to the instruction list), they get dropped 2058 * on the floor. 2059 */ 2060 exec_node *previous_tail = NULL; 2061 YYLTYPE previous_operand_loc = loc; 2062 2063 foreach_list_typed (ast_node, ast, link, &this->expressions) { 2064 /* If one of the operands of comma operator does not generate any 2065 * code, we want to emit a warning. At each pass through the loop 2066 * previous_tail will point to the last instruction in the stream 2067 * *before* processing the previous operand. Naturally, 2068 * instructions->get_tail_raw() will point to the last instruction in 2069 * the stream *after* processing the previous operand. If the two 2070 * pointers match, then the previous operand had no effect. 2071 * 2072 * The warning behavior here differs slightly from GCC. GCC will 2073 * only emit a warning if none of the left-hand operands have an 2074 * effect. However, it will emit a warning for each. I believe that 2075 * there are some cases in C (especially with GCC extensions) where 2076 * it is useful to have an intermediate step in a sequence have no 2077 * effect, but I don't think these cases exist in GLSL. Either way, 2078 * it would be a giant hassle to replicate that behavior. 2079 */ 2080 if (previous_tail == instructions->get_tail_raw()) { 2081 _mesa_glsl_warning(&previous_operand_loc, state, 2082 "left-hand operand of comma expression has " 2083 "no effect"); 2084 } 2085 2086 /* The tail is directly accessed instead of using the get_tail() 2087 * method for performance reasons. get_tail() has extra code to 2088 * return NULL when the list is empty. We don't care about that 2089 * here, so using get_tail_raw() is fine. 2090 */ 2091 previous_tail = instructions->get_tail_raw(); 2092 previous_operand_loc = ast->get_location(); 2093 2094 result = ast->hir(instructions, state); 2095 } 2096 2097 /* Any errors should have already been emitted in the loop above. 2098 */ 2099 error_emitted = true; 2100 break; 2101 } 2102 } 2103 type = NULL; /* use result->type, not type. */ 2104 assert(result != NULL || !needs_rvalue); 2105 2106 if (result && result->type->is_error() && !error_emitted) 2107 _mesa_glsl_error(& loc, state, "type mismatch"); 2108 2109 return result; 2110 } 2111 2112 bool 2113 ast_expression::has_sequence_subexpression() const 2114 { 2115 switch (this->oper) { 2116 case ast_plus: 2117 case ast_neg: 2118 case ast_bit_not: 2119 case ast_logic_not: 2120 case ast_pre_inc: 2121 case ast_pre_dec: 2122 case ast_post_inc: 2123 case ast_post_dec: 2124 return this->subexpressions[0]->has_sequence_subexpression(); 2125 2126 case ast_assign: 2127 case ast_add: 2128 case ast_sub: 2129 case ast_mul: 2130 case ast_div: 2131 case ast_mod: 2132 case ast_lshift: 2133 case ast_rshift: 2134 case ast_less: 2135 case ast_greater: 2136 case ast_lequal: 2137 case ast_gequal: 2138 case ast_nequal: 2139 case ast_equal: 2140 case ast_bit_and: 2141 case ast_bit_xor: 2142 case ast_bit_or: 2143 case ast_logic_and: 2144 case ast_logic_or: 2145 case ast_logic_xor: 2146 case ast_array_index: 2147 case ast_mul_assign: 2148 case ast_div_assign: 2149 case ast_add_assign: 2150 case ast_sub_assign: 2151 case ast_mod_assign: 2152 case ast_ls_assign: 2153 case ast_rs_assign: 2154 case ast_and_assign: 2155 case ast_xor_assign: 2156 case ast_or_assign: 2157 return this->subexpressions[0]->has_sequence_subexpression() || 2158 this->subexpressions[1]->has_sequence_subexpression(); 2159 2160 case ast_conditional: 2161 return this->subexpressions[0]->has_sequence_subexpression() || 2162 this->subexpressions[1]->has_sequence_subexpression() || 2163 this->subexpressions[2]->has_sequence_subexpression(); 2164 2165 case ast_sequence: 2166 return true; 2167 2168 case ast_field_selection: 2169 case ast_identifier: 2170 case ast_int_constant: 2171 case ast_uint_constant: 2172 case ast_float_constant: 2173 case ast_bool_constant: 2174 case ast_double_constant: 2175 case ast_int64_constant: 2176 case ast_uint64_constant: 2177 return false; 2178 2179 case ast_aggregate: 2180 return false; 2181 2182 case ast_function_call: 2183 unreachable("should be handled by ast_function_expression::hir"); 2184 2185 case ast_unsized_array_dim: 2186 unreachable("ast_unsized_array_dim: Should never get here."); 2187 } 2188 2189 return false; 2190 } 2191 2192 ir_rvalue * 2193 ast_expression_statement::hir(exec_list *instructions, 2194 struct _mesa_glsl_parse_state *state) 2195 { 2196 /* It is possible to have expression statements that don't have an 2197 * expression. This is the solitary semicolon: 2198 * 2199 * for (i = 0; i < 5; i++) 2200 * ; 2201 * 2202 * In this case the expression will be NULL. Test for NULL and don't do 2203 * anything in that case. 2204 */ 2205 if (expression != NULL) 2206 expression->hir_no_rvalue(instructions, state); 2207 2208 /* Statements do not have r-values. 2209 */ 2210 return NULL; 2211 } 2212 2213 2214 ir_rvalue * 2215 ast_compound_statement::hir(exec_list *instructions, 2216 struct _mesa_glsl_parse_state *state) 2217 { 2218 if (new_scope) 2219 state->symbols->push_scope(); 2220 2221 foreach_list_typed (ast_node, ast, link, &this->statements) 2222 ast->hir(instructions, state); 2223 2224 if (new_scope) 2225 state->symbols->pop_scope(); 2226 2227 /* Compound statements do not have r-values. 2228 */ 2229 return NULL; 2230 } 2231 2232 /** 2233 * Evaluate the given exec_node (which should be an ast_node representing 2234 * a single array dimension) and return its integer value. 2235 */ 2236 static unsigned 2237 process_array_size(exec_node *node, 2238 struct _mesa_glsl_parse_state *state) 2239 { 2240 void *mem_ctx = state; 2241 2242 exec_list dummy_instructions; 2243 2244 ast_node *array_size = exec_node_data(ast_node, node, link); 2245 2246 /** 2247 * Dimensions other than the outermost dimension can by unsized if they 2248 * are immediately sized by a constructor or initializer. 2249 */ 2250 if (((ast_expression*)array_size)->oper == ast_unsized_array_dim) 2251 return 0; 2252 2253 ir_rvalue *const ir = array_size->hir(& dummy_instructions, state); 2254 YYLTYPE loc = array_size->get_location(); 2255 2256 if (ir == NULL) { 2257 _mesa_glsl_error(& loc, state, 2258 "array size could not be resolved"); 2259 return 0; 2260 } 2261 2262 if (!ir->type->is_integer()) { 2263 _mesa_glsl_error(& loc, state, 2264 "array size must be integer type"); 2265 return 0; 2266 } 2267 2268 if (!ir->type->is_scalar()) { 2269 _mesa_glsl_error(& loc, state, 2270 "array size must be scalar type"); 2271 return 0; 2272 } 2273 2274 ir_constant *const size = ir->constant_expression_value(mem_ctx); 2275 if (size == NULL || 2276 (state->is_version(120, 300) && 2277 array_size->has_sequence_subexpression())) { 2278 _mesa_glsl_error(& loc, state, "array size must be a " 2279 "constant valued expression"); 2280 return 0; 2281 } 2282 2283 if (size->value.i[0] <= 0) { 2284 _mesa_glsl_error(& loc, state, "array size must be > 0"); 2285 return 0; 2286 } 2287 2288 assert(size->type == ir->type); 2289 2290 /* If the array size is const (and we've verified that 2291 * it is) then no instructions should have been emitted 2292 * when we converted it to HIR. If they were emitted, 2293 * then either the array size isn't const after all, or 2294 * we are emitting unnecessary instructions. 2295 */ 2296 assert(dummy_instructions.is_empty()); 2297 2298 return size->value.u[0]; 2299 } 2300 2301 static const glsl_type * 2302 process_array_type(YYLTYPE *loc, const glsl_type *base, 2303 ast_array_specifier *array_specifier, 2304 struct _mesa_glsl_parse_state *state) 2305 { 2306 const glsl_type *array_type = base; 2307 2308 if (array_specifier != NULL) { 2309 if (base->is_array()) { 2310 2311 /* From page 19 (page 25) of the GLSL 1.20 spec: 2312 * 2313 * "Only one-dimensional arrays may be declared." 2314 */ 2315 if (!state->check_arrays_of_arrays_allowed(loc)) { 2316 return glsl_type::error_type; 2317 } 2318 } 2319 2320 for (exec_node *node = array_specifier->array_dimensions.get_tail_raw(); 2321 !node->is_head_sentinel(); node = node->prev) { 2322 unsigned array_size = process_array_size(node, state); 2323 array_type = glsl_type::get_array_instance(array_type, array_size); 2324 } 2325 } 2326 2327 return array_type; 2328 } 2329 2330 static bool 2331 precision_qualifier_allowed(const glsl_type *type) 2332 { 2333 /* Precision qualifiers apply to floating point, integer and opaque 2334 * types. 2335 * 2336 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says: 2337 * "Any floating point or any integer declaration can have the type 2338 * preceded by one of these precision qualifiers [...] Literal 2339 * constants do not have precision qualifiers. Neither do Boolean 2340 * variables. 2341 * 2342 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30 2343 * spec also says: 2344 * 2345 * "Precision qualifiers are added for code portability with OpenGL 2346 * ES, not for functionality. They have the same syntax as in OpenGL 2347 * ES." 2348 * 2349 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says: 2350 * 2351 * "uniform lowp sampler2D sampler; 2352 * highp vec2 coord; 2353 * ... 2354 * lowp vec4 col = texture2D (sampler, coord); 2355 * // texture2D returns lowp" 2356 * 2357 * From this, we infer that GLSL 1.30 (and later) should allow precision 2358 * qualifiers on sampler types just like float and integer types. 2359 */ 2360 const glsl_type *const t = type->without_array(); 2361 2362 return (t->is_float() || t->is_integer() || t->contains_opaque()) && 2363 !t->is_record(); 2364 } 2365 2366 const glsl_type * 2367 ast_type_specifier::glsl_type(const char **name, 2368 struct _mesa_glsl_parse_state *state) const 2369 { 2370 const struct glsl_type *type; 2371 2372 if (this->type != NULL) 2373 type = this->type; 2374 else if (structure) 2375 type = structure->type; 2376 else 2377 type = state->symbols->get_type(this->type_name); 2378 *name = this->type_name; 2379 2380 YYLTYPE loc = this->get_location(); 2381 type = process_array_type(&loc, type, this->array_specifier, state); 2382 2383 return type; 2384 } 2385 2386 /** 2387 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers: 2388 * 2389 * "The precision statement 2390 * 2391 * precision precision-qualifier type; 2392 * 2393 * can be used to establish a default precision qualifier. The type field can 2394 * be either int or float or any of the sampler types, (...) If type is float, 2395 * the directive applies to non-precision-qualified floating point type 2396 * (scalar, vector, and matrix) declarations. If type is int, the directive 2397 * applies to all non-precision-qualified integer type (scalar, vector, signed, 2398 * and unsigned) declarations." 2399 * 2400 * We use the symbol table to keep the values of the default precisions for 2401 * each 'type' in each scope and we use the 'type' string from the precision 2402 * statement as key in the symbol table. When we want to retrieve the default 2403 * precision associated with a given glsl_type we need to know the type string 2404 * associated with it. This is what this function returns. 2405 */ 2406 static const char * 2407 get_type_name_for_precision_qualifier(const glsl_type *type) 2408 { 2409 switch (type->base_type) { 2410 case GLSL_TYPE_FLOAT: 2411 return "float"; 2412 case GLSL_TYPE_UINT: 2413 case GLSL_TYPE_INT: 2414 return "int"; 2415 case GLSL_TYPE_ATOMIC_UINT: 2416 return "atomic_uint"; 2417 case GLSL_TYPE_IMAGE: 2418 /* fallthrough */ 2419 case GLSL_TYPE_SAMPLER: { 2420 const unsigned type_idx = 2421 type->sampler_array + 2 * type->sampler_shadow; 2422 const unsigned offset = type->is_sampler() ? 0 : 4; 2423 assert(type_idx < 4); 2424 switch (type->sampled_type) { 2425 case GLSL_TYPE_FLOAT: 2426 switch (type->sampler_dimensionality) { 2427 case GLSL_SAMPLER_DIM_1D: { 2428 assert(type->is_sampler()); 2429 static const char *const names[4] = { 2430 "sampler1D", "sampler1DArray", 2431 "sampler1DShadow", "sampler1DArrayShadow" 2432 }; 2433 return names[type_idx]; 2434 } 2435 case GLSL_SAMPLER_DIM_2D: { 2436 static const char *const names[8] = { 2437 "sampler2D", "sampler2DArray", 2438 "sampler2DShadow", "sampler2DArrayShadow", 2439 "image2D", "image2DArray", NULL, NULL 2440 }; 2441 return names[offset + type_idx]; 2442 } 2443 case GLSL_SAMPLER_DIM_3D: { 2444 static const char *const names[8] = { 2445 "sampler3D", NULL, NULL, NULL, 2446 "image3D", NULL, NULL, NULL 2447 }; 2448 return names[offset + type_idx]; 2449 } 2450 case GLSL_SAMPLER_DIM_CUBE: { 2451 static const char *const names[8] = { 2452 "samplerCube", "samplerCubeArray", 2453 "samplerCubeShadow", "samplerCubeArrayShadow", 2454 "imageCube", NULL, NULL, NULL 2455 }; 2456 return names[offset + type_idx]; 2457 } 2458 case GLSL_SAMPLER_DIM_MS: { 2459 assert(type->is_sampler()); 2460 static const char *const names[4] = { 2461 "sampler2DMS", "sampler2DMSArray", NULL, NULL 2462 }; 2463 return names[type_idx]; 2464 } 2465 case GLSL_SAMPLER_DIM_RECT: { 2466 assert(type->is_sampler()); 2467 static const char *const names[4] = { 2468 "samplerRect", NULL, "samplerRectShadow", NULL 2469 }; 2470 return names[type_idx]; 2471 } 2472 case GLSL_SAMPLER_DIM_BUF: { 2473 static const char *const names[8] = { 2474 "samplerBuffer", NULL, NULL, NULL, 2475 "imageBuffer", NULL, NULL, NULL 2476 }; 2477 return names[offset + type_idx]; 2478 } 2479 case GLSL_SAMPLER_DIM_EXTERNAL: { 2480 assert(type->is_sampler()); 2481 static const char *const names[4] = { 2482 "samplerExternalOES", NULL, NULL, NULL 2483 }; 2484 return names[type_idx]; 2485 } 2486 default: 2487 unreachable("Unsupported sampler/image dimensionality"); 2488 } /* sampler/image float dimensionality */ 2489 break; 2490 case GLSL_TYPE_INT: 2491 switch (type->sampler_dimensionality) { 2492 case GLSL_SAMPLER_DIM_1D: { 2493 assert(type->is_sampler()); 2494 static const char *const names[4] = { 2495 "isampler1D", "isampler1DArray", NULL, NULL 2496 }; 2497 return names[type_idx]; 2498 } 2499 case GLSL_SAMPLER_DIM_2D: { 2500 static const char *const names[8] = { 2501 "isampler2D", "isampler2DArray", NULL, NULL, 2502 "iimage2D", "iimage2DArray", NULL, NULL 2503 }; 2504 return names[offset + type_idx]; 2505 } 2506 case GLSL_SAMPLER_DIM_3D: { 2507 static const char *const names[8] = { 2508 "isampler3D", NULL, NULL, NULL, 2509 "iimage3D", NULL, NULL, NULL 2510 }; 2511 return names[offset + type_idx]; 2512 } 2513 case GLSL_SAMPLER_DIM_CUBE: { 2514 static const char *const names[8] = { 2515 "isamplerCube", "isamplerCubeArray", NULL, NULL, 2516 "iimageCube", NULL, NULL, NULL 2517 }; 2518 return names[offset + type_idx]; 2519 } 2520 case GLSL_SAMPLER_DIM_MS: { 2521 assert(type->is_sampler()); 2522 static const char *const names[4] = { 2523 "isampler2DMS", "isampler2DMSArray", NULL, NULL 2524 }; 2525 return names[type_idx]; 2526 } 2527 case GLSL_SAMPLER_DIM_RECT: { 2528 assert(type->is_sampler()); 2529 static const char *const names[4] = { 2530 "isamplerRect", NULL, "isamplerRectShadow", NULL 2531 }; 2532 return names[type_idx]; 2533 } 2534 case GLSL_SAMPLER_DIM_BUF: { 2535 static const char *const names[8] = { 2536 "isamplerBuffer", NULL, NULL, NULL, 2537 "iimageBuffer", NULL, NULL, NULL 2538 }; 2539 return names[offset + type_idx]; 2540 } 2541 default: 2542 unreachable("Unsupported isampler/iimage dimensionality"); 2543 } /* sampler/image int dimensionality */ 2544 break; 2545 case GLSL_TYPE_UINT: 2546 switch (type->sampler_dimensionality) { 2547 case GLSL_SAMPLER_DIM_1D: { 2548 assert(type->is_sampler()); 2549 static const char *const names[4] = { 2550 "usampler1D", "usampler1DArray", NULL, NULL 2551 }; 2552 return names[type_idx]; 2553 } 2554 case GLSL_SAMPLER_DIM_2D: { 2555 static const char *const names[8] = { 2556 "usampler2D", "usampler2DArray", NULL, NULL, 2557 "uimage2D", "uimage2DArray", NULL, NULL 2558 }; 2559 return names[offset + type_idx]; 2560 } 2561 case GLSL_SAMPLER_DIM_3D: { 2562 static const char *const names[8] = { 2563 "usampler3D", NULL, NULL, NULL, 2564 "uimage3D", NULL, NULL, NULL 2565 }; 2566 return names[offset + type_idx]; 2567 } 2568 case GLSL_SAMPLER_DIM_CUBE: { 2569 static const char *const names[8] = { 2570 "usamplerCube", "usamplerCubeArray", NULL, NULL, 2571 "uimageCube", NULL, NULL, NULL 2572 }; 2573 return names[offset + type_idx]; 2574 } 2575 case GLSL_SAMPLER_DIM_MS: { 2576 assert(type->is_sampler()); 2577 static const char *const names[4] = { 2578 "usampler2DMS", "usampler2DMSArray", NULL, NULL 2579 }; 2580 return names[type_idx]; 2581 } 2582 case GLSL_SAMPLER_DIM_RECT: { 2583 assert(type->is_sampler()); 2584 static const char *const names[4] = { 2585 "usamplerRect", NULL, "usamplerRectShadow", NULL 2586 }; 2587 return names[type_idx]; 2588 } 2589 case GLSL_SAMPLER_DIM_BUF: { 2590 static const char *const names[8] = { 2591 "usamplerBuffer", NULL, NULL, NULL, 2592 "uimageBuffer", NULL, NULL, NULL 2593 }; 2594 return names[offset + type_idx]; 2595 } 2596 default: 2597 unreachable("Unsupported usampler/uimage dimensionality"); 2598 } /* sampler/image uint dimensionality */ 2599 break; 2600 default: 2601 unreachable("Unsupported sampler/image type"); 2602 } /* sampler/image type */ 2603 break; 2604 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */ 2605 break; 2606 default: 2607 unreachable("Unsupported type"); 2608 } /* base type */ 2609 } 2610 2611 static unsigned 2612 select_gles_precision(unsigned qual_precision, 2613 const glsl_type *type, 2614 struct _mesa_glsl_parse_state *state, YYLTYPE *loc) 2615 { 2616 /* Precision qualifiers do not have any meaning in Desktop GLSL. 2617 * In GLES we take the precision from the type qualifier if present, 2618 * otherwise, if the type of the variable allows precision qualifiers at 2619 * all, we look for the default precision qualifier for that type in the 2620 * current scope. 2621 */ 2622 assert(state->es_shader); 2623 2624 unsigned precision = GLSL_PRECISION_NONE; 2625 if (qual_precision) { 2626 precision = qual_precision; 2627 } else if (precision_qualifier_allowed(type)) { 2628 const char *type_name = 2629 get_type_name_for_precision_qualifier(type->without_array()); 2630 assert(type_name != NULL); 2631 2632 precision = 2633 state->symbols->get_default_precision_qualifier(type_name); 2634 if (precision == ast_precision_none) { 2635 _mesa_glsl_error(loc, state, 2636 "No precision specified in this scope for type `%s'", 2637 type->name); 2638 } 2639 } 2640 2641 2642 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says: 2643 * 2644 * "The default precision of all atomic types is highp. It is an error to 2645 * declare an atomic type with a different precision or to specify the 2646 * default precision for an atomic type to be lowp or mediump." 2647 */ 2648 if (type->is_atomic_uint() && precision != ast_precision_high) { 2649 _mesa_glsl_error(loc, state, 2650 "atomic_uint can only have highp precision qualifier"); 2651 } 2652 2653 return precision; 2654 } 2655 2656 const glsl_type * 2657 ast_fully_specified_type::glsl_type(const char **name, 2658 struct _mesa_glsl_parse_state *state) const 2659 { 2660 return this->specifier->glsl_type(name, state); 2661 } 2662 2663 /** 2664 * Determine whether a toplevel variable declaration declares a varying. This 2665 * function operates by examining the variable's mode and the shader target, 2666 * so it correctly identifies linkage variables regardless of whether they are 2667 * declared using the deprecated "varying" syntax or the new "in/out" syntax. 2668 * 2669 * Passing a non-toplevel variable declaration (e.g. a function parameter) to 2670 * this function will produce undefined results. 2671 */ 2672 static bool 2673 is_varying_var(ir_variable *var, gl_shader_stage target) 2674 { 2675 switch (target) { 2676 case MESA_SHADER_VERTEX: 2677 return var->data.mode == ir_var_shader_out; 2678 case MESA_SHADER_FRAGMENT: 2679 return var->data.mode == ir_var_shader_in; 2680 default: 2681 return var->data.mode == ir_var_shader_out || var->data.mode == ir_var_shader_in; 2682 } 2683 } 2684 2685 static bool 2686 is_allowed_invariant(ir_variable *var, struct _mesa_glsl_parse_state *state) 2687 { 2688 if (is_varying_var(var, state->stage)) 2689 return true; 2690 2691 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec: 2692 * "Only variables output from a vertex shader can be candidates 2693 * for invariance". 2694 */ 2695 if (!state->is_version(130, 0)) 2696 return false; 2697 2698 /* 2699 * Later specs remove this language - so allowed invariant 2700 * on fragment shader outputs as well. 2701 */ 2702 if (state->stage == MESA_SHADER_FRAGMENT && 2703 var->data.mode == ir_var_shader_out) 2704 return true; 2705 return false; 2706 } 2707 2708 /** 2709 * Matrix layout qualifiers are only allowed on certain types 2710 */ 2711 static void 2712 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state *state, 2713 YYLTYPE *loc, 2714 const glsl_type *type, 2715 ir_variable *var) 2716 { 2717 if (var && !var->is_in_buffer_block()) { 2718 /* Layout qualifiers may only apply to interface blocks and fields in 2719 * them. 2720 */ 2721 _mesa_glsl_error(loc, state, 2722 "uniform block layout qualifiers row_major and " 2723 "column_major may not be applied to variables " 2724 "outside of uniform blocks"); 2725 } else if (!type->without_array()->is_matrix()) { 2726 /* The OpenGL ES 3.0 conformance tests did not originally allow 2727 * matrix layout qualifiers on non-matrices. However, the OpenGL 2728 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were 2729 * amended to specifically allow these layouts on all types. Emit 2730 * a warning so that people know their code may not be portable. 2731 */ 2732 _mesa_glsl_warning(loc, state, 2733 "uniform block layout qualifiers row_major and " 2734 "column_major applied to non-matrix types may " 2735 "be rejected by older compilers"); 2736 } 2737 } 2738 2739 static bool 2740 validate_xfb_buffer_qualifier(YYLTYPE *loc, 2741 struct _mesa_glsl_parse_state *state, 2742 unsigned xfb_buffer) { 2743 if (xfb_buffer >= state->Const.MaxTransformFeedbackBuffers) { 2744 _mesa_glsl_error(loc, state, 2745 "invalid xfb_buffer specified %d is larger than " 2746 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).", 2747 xfb_buffer, 2748 state->Const.MaxTransformFeedbackBuffers - 1); 2749 return false; 2750 } 2751 2752 return true; 2753 } 2754 2755 /* From the ARB_enhanced_layouts spec: 2756 * 2757 * "Variables and block members qualified with *xfb_offset* can be 2758 * scalars, vectors, matrices, structures, and (sized) arrays of these. 2759 * The offset must be a multiple of the size of the first component of 2760 * the first qualified variable or block member, or a compile-time error 2761 * results. Further, if applied to an aggregate containing a double, 2762 * the offset must also be a multiple of 8, and the space taken in the 2763 * buffer will be a multiple of 8. 2764 */ 2765 static bool 2766 validate_xfb_offset_qualifier(YYLTYPE *loc, 2767 struct _mesa_glsl_parse_state *state, 2768 int xfb_offset, const glsl_type *type, 2769 unsigned component_size) { 2770 const glsl_type *t_without_array = type->without_array(); 2771 2772 if (xfb_offset != -1 && type->is_unsized_array()) { 2773 _mesa_glsl_error(loc, state, 2774 "xfb_offset can't be used with unsized arrays."); 2775 return false; 2776 } 2777 2778 /* Make sure nested structs don't contain unsized arrays, and validate 2779 * any xfb_offsets on interface members. 2780 */ 2781 if (t_without_array->is_record() || t_without_array->is_interface()) 2782 for (unsigned int i = 0; i < t_without_array->length; i++) { 2783 const glsl_type *member_t = t_without_array->fields.structure[i].type; 2784 2785 /* When the interface block doesn't have an xfb_offset qualifier then 2786 * we apply the component size rules at the member level. 2787 */ 2788 if (xfb_offset == -1) 2789 component_size = member_t->contains_double() ? 8 : 4; 2790 2791 int xfb_offset = t_without_array->fields.structure[i].offset; 2792 validate_xfb_offset_qualifier(loc, state, xfb_offset, member_t, 2793 component_size); 2794 } 2795 2796 /* Nested structs or interface block without offset may not have had an 2797 * offset applied yet so return. 2798 */ 2799 if (xfb_offset == -1) { 2800 return true; 2801 } 2802 2803 if (xfb_offset % component_size) { 2804 _mesa_glsl_error(loc, state, 2805 "invalid qualifier xfb_offset=%d must be a multiple " 2806 "of the first component size of the first qualified " 2807 "variable or block member. Or double if an aggregate " 2808 "that contains a double (%d).", 2809 xfb_offset, component_size); 2810 return false; 2811 } 2812 2813 return true; 2814 } 2815 2816 static bool 2817 validate_stream_qualifier(YYLTYPE *loc, struct _mesa_glsl_parse_state *state, 2818 unsigned stream) 2819 { 2820 if (stream >= state->ctx->Const.MaxVertexStreams) { 2821 _mesa_glsl_error(loc, state, 2822 "invalid stream specified %d is larger than " 2823 "MAX_VERTEX_STREAMS - 1 (%d).", 2824 stream, state->ctx->Const.MaxVertexStreams - 1); 2825 return false; 2826 } 2827 2828 return true; 2829 } 2830 2831 static void 2832 apply_explicit_binding(struct _mesa_glsl_parse_state *state, 2833 YYLTYPE *loc, 2834 ir_variable *var, 2835 const glsl_type *type, 2836 const ast_type_qualifier *qual) 2837 { 2838 if (!qual->flags.q.uniform && !qual->flags.q.buffer) { 2839 _mesa_glsl_error(loc, state, 2840 "the \"binding\" qualifier only applies to uniforms and " 2841 "shader storage buffer objects"); 2842 return; 2843 } 2844 2845 unsigned qual_binding; 2846 if (!process_qualifier_constant(state, loc, "binding", qual->binding, 2847 &qual_binding)) { 2848 return; 2849 } 2850 2851 const struct gl_context *const ctx = state->ctx; 2852 unsigned elements = type->is_array() ? type->arrays_of_arrays_size() : 1; 2853 unsigned max_index = qual_binding + elements - 1; 2854 const glsl_type *base_type = type->without_array(); 2855 2856 if (base_type->is_interface()) { 2857 /* UBOs. From page 60 of the GLSL 4.20 specification: 2858 * "If the binding point for any uniform block instance is less than zero, 2859 * or greater than or equal to the implementation-dependent maximum 2860 * number of uniform buffer bindings, a compilation error will occur. 2861 * When the binding identifier is used with a uniform block instanced as 2862 * an array of size N, all elements of the array from binding through 2863 * binding + N 1 must be within this range." 2864 * 2865 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS. 2866 */ 2867 if (qual->flags.q.uniform && 2868 max_index >= ctx->Const.MaxUniformBufferBindings) { 2869 _mesa_glsl_error(loc, state, "layout(binding = %u) for %d UBOs exceeds " 2870 "the maximum number of UBO binding points (%d)", 2871 qual_binding, elements, 2872 ctx->Const.MaxUniformBufferBindings); 2873 return; 2874 } 2875 2876 /* SSBOs. From page 67 of the GLSL 4.30 specification: 2877 * "If the binding point for any uniform or shader storage block instance 2878 * is less than zero, or greater than or equal to the 2879 * implementation-dependent maximum number of uniform buffer bindings, a 2880 * compile-time error will occur. When the binding identifier is used 2881 * with a uniform or shader storage block instanced as an array of size 2882 * N, all elements of the array from binding through binding + N 1 must 2883 * be within this range." 2884 */ 2885 if (qual->flags.q.buffer && 2886 max_index >= ctx->Const.MaxShaderStorageBufferBindings) { 2887 _mesa_glsl_error(loc, state, "layout(binding = %u) for %d SSBOs exceeds " 2888 "the maximum number of SSBO binding points (%d)", 2889 qual_binding, elements, 2890 ctx->Const.MaxShaderStorageBufferBindings); 2891 return; 2892 } 2893 } else if (base_type->is_sampler()) { 2894 /* Samplers. From page 63 of the GLSL 4.20 specification: 2895 * "If the binding is less than zero, or greater than or equal to the 2896 * implementation-dependent maximum supported number of units, a 2897 * compilation error will occur. When the binding identifier is used 2898 * with an array of size N, all elements of the array from binding 2899 * through binding + N - 1 must be within this range." 2900 */ 2901 unsigned limit = ctx->Const.MaxCombinedTextureImageUnits; 2902 2903 if (max_index >= limit) { 2904 _mesa_glsl_error(loc, state, "layout(binding = %d) for %d samplers " 2905 "exceeds the maximum number of texture image units " 2906 "(%u)", qual_binding, elements, limit); 2907 2908 return; 2909 } 2910 } else if (base_type->contains_atomic()) { 2911 assert(ctx->Const.MaxAtomicBufferBindings <= MAX_COMBINED_ATOMIC_BUFFERS); 2912 if (qual_binding >= ctx->Const.MaxAtomicBufferBindings) { 2913 _mesa_glsl_error(loc, state, "layout(binding = %d) exceeds the " 2914 "maximum number of atomic counter buffer bindings " 2915 "(%u)", qual_binding, 2916 ctx->Const.MaxAtomicBufferBindings); 2917 2918 return; 2919 } 2920 } else if ((state->is_version(420, 310) || 2921 state->ARB_shading_language_420pack_enable) && 2922 base_type->is_image()) { 2923 assert(ctx->Const.MaxImageUnits <= MAX_IMAGE_UNITS); 2924 if (max_index >= ctx->Const.MaxImageUnits) { 2925 _mesa_glsl_error(loc, state, "Image binding %d exceeds the " 2926 "maximum number of image units (%d)", max_index, 2927 ctx->Const.MaxImageUnits); 2928 return; 2929 } 2930 2931 } else { 2932 _mesa_glsl_error(loc, state, 2933 "the \"binding\" qualifier only applies to uniform " 2934 "blocks, storage blocks, opaque variables, or arrays " 2935 "thereof"); 2936 return; 2937 } 2938 2939 var->data.explicit_binding = true; 2940 var->data.binding = qual_binding; 2941 2942 return; 2943 } 2944 2945 static void 2946 validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state *state, 2947 YYLTYPE *loc, 2948 const glsl_interp_mode interpolation, 2949 const struct glsl_type *var_type, 2950 ir_variable_mode mode) 2951 { 2952 if (state->stage != MESA_SHADER_FRAGMENT || 2953 interpolation == INTERP_MODE_FLAT || 2954 mode != ir_var_shader_in) 2955 return; 2956 2957 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES, 2958 * so must integer vertex outputs. 2959 * 2960 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec: 2961 * "Fragment shader inputs that are signed or unsigned integers or 2962 * integer vectors must be qualified with the interpolation qualifier 2963 * flat." 2964 * 2965 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec: 2966 * "Fragment shader inputs that are, or contain, signed or unsigned 2967 * integers or integer vectors must be qualified with the 2968 * interpolation qualifier flat." 2969 * 2970 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec: 2971 * "Vertex shader outputs that are, or contain, signed or unsigned 2972 * integers or integer vectors must be qualified with the 2973 * interpolation qualifier flat." 2974 * 2975 * Note that prior to GLSL 1.50, this requirement applied to vertex 2976 * outputs rather than fragment inputs. That creates problems in the 2977 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all 2978 * desktop GL shaders. For GLSL ES shaders, we follow the spec and 2979 * apply the restriction to both vertex outputs and fragment inputs. 2980 * 2981 * Note also that the desktop GLSL specs are missing the text "or 2982 * contain"; this is presumably an oversight, since there is no 2983 * reasonable way to interpolate a fragment shader input that contains 2984 * an integer. See Khronos bug #15671. 2985 */ 2986 if (state->is_version(130, 300) 2987 && var_type->contains_integer()) { 2988 _mesa_glsl_error(loc, state, "if a fragment input is (or contains) " 2989 "an integer, then it must be qualified with 'flat'"); 2990 } 2991 2992 /* Double fragment inputs must be qualified with 'flat'. 2993 * 2994 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec: 2995 * "This extension does not support interpolation of double-precision 2996 * values; doubles used as fragment shader inputs must be qualified as 2997 * "flat"." 2998 * 2999 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec: 3000 * "Fragment shader inputs that are signed or unsigned integers, integer 3001 * vectors, or any double-precision floating-point type must be 3002 * qualified with the interpolation qualifier flat." 3003 * 3004 * Note that the GLSL specs are missing the text "or contain"; this is 3005 * presumably an oversight. See Khronos bug #15671. 3006 * 3007 * The 'double' type does not exist in GLSL ES so far. 3008 */ 3009 if (state->has_double() 3010 && var_type->contains_double()) { 3011 _mesa_glsl_error(loc, state, "if a fragment input is (or contains) " 3012 "a double, then it must be qualified with 'flat'"); 3013 } 3014 3015 /* Bindless sampler/image fragment inputs must be qualified with 'flat'. 3016 * 3017 * From section 4.3.4 of the ARB_bindless_texture spec: 3018 * 3019 * "(modify last paragraph, p. 35, allowing samplers and images as 3020 * fragment shader inputs) ... Fragment inputs can only be signed and 3021 * unsigned integers and integer vectors, floating point scalars, 3022 * floating-point vectors, matrices, sampler and image types, or arrays 3023 * or structures of these. Fragment shader inputs that are signed or 3024 * unsigned integers, integer vectors, or any double-precision floating- 3025 * point type, or any sampler or image type must be qualified with the 3026 * interpolation qualifier "flat"." 3027 */ 3028 if (state->has_bindless() 3029 && (var_type->contains_sampler() || var_type->contains_image())) { 3030 _mesa_glsl_error(loc, state, "if a fragment input is (or contains) " 3031 "a bindless sampler (or image), then it must be " 3032 "qualified with 'flat'"); 3033 } 3034 } 3035 3036 static void 3037 validate_interpolation_qualifier(struct _mesa_glsl_parse_state *state, 3038 YYLTYPE *loc, 3039 const glsl_interp_mode interpolation, 3040 const struct ast_type_qualifier *qual, 3041 const struct glsl_type *var_type, 3042 ir_variable_mode mode) 3043 { 3044 /* Interpolation qualifiers can only apply to shader inputs or outputs, but 3045 * not to vertex shader inputs nor fragment shader outputs. 3046 * 3047 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec: 3048 * "Outputs from a vertex shader (out) and inputs to a fragment 3049 * shader (in) can be further qualified with one or more of these 3050 * interpolation qualifiers" 3051 * ... 3052 * "These interpolation qualifiers may only precede the qualifiers in, 3053 * centroid in, out, or centroid out in a declaration. They do not apply 3054 * to the deprecated storage qualifiers varying or centroid 3055 * varying. They also do not apply to inputs into a vertex shader or 3056 * outputs from a fragment shader." 3057 * 3058 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec: 3059 * "Outputs from a shader (out) and inputs to a shader (in) can be 3060 * further qualified with one of these interpolation qualifiers." 3061 * ... 3062 * "These interpolation qualifiers may only precede the qualifiers 3063 * in, centroid in, out, or centroid out in a declaration. They do 3064 * not apply to inputs into a vertex shader or outputs from a 3065 * fragment shader." 3066 */ 3067 if (state->is_version(130, 300) 3068 && interpolation != INTERP_MODE_NONE) { 3069 const char *i = interpolation_string(interpolation); 3070 if (mode != ir_var_shader_in && mode != ir_var_shader_out) 3071 _mesa_glsl_error(loc, state, 3072 "interpolation qualifier `%s' can only be applied to " 3073 "shader inputs or outputs.", i); 3074 3075 switch (state->stage) { 3076 case MESA_SHADER_VERTEX: 3077 if (mode == ir_var_shader_in) { 3078 _mesa_glsl_error(loc, state, 3079 "interpolation qualifier '%s' cannot be applied to " 3080 "vertex shader inputs", i); 3081 } 3082 break; 3083 case MESA_SHADER_FRAGMENT: 3084 if (mode == ir_var_shader_out) { 3085 _mesa_glsl_error(loc, state, 3086 "interpolation qualifier '%s' cannot be applied to " 3087 "fragment shader outputs", i); 3088 } 3089 break; 3090 default: 3091 break; 3092 } 3093 } 3094 3095 /* Interpolation qualifiers cannot be applied to 'centroid' and 3096 * 'centroid varying'. 3097 * 3098 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec: 3099 * "interpolation qualifiers may only precede the qualifiers in, 3100 * centroid in, out, or centroid out in a declaration. They do not apply 3101 * to the deprecated storage qualifiers varying or centroid varying." 3102 * 3103 * These deprecated storage qualifiers do not exist in GLSL ES 3.00. 3104 */ 3105 if (state->is_version(130, 0) 3106 && interpolation != INTERP_MODE_NONE 3107 && qual->flags.q.varying) { 3108 3109 const char *i = interpolation_string(interpolation); 3110 const char *s; 3111 if (qual->flags.q.centroid) 3112 s = "centroid varying"; 3113 else 3114 s = "varying"; 3115 3116 _mesa_glsl_error(loc, state, 3117 "qualifier '%s' cannot be applied to the " 3118 "deprecated storage qualifier '%s'", i, s); 3119 } 3120 3121 validate_fragment_flat_interpolation_input(state, loc, interpolation, 3122 var_type, mode); 3123 } 3124 3125 static glsl_interp_mode 3126 interpret_interpolation_qualifier(const struct ast_type_qualifier *qual, 3127 const struct glsl_type *var_type, 3128 ir_variable_mode mode, 3129 struct _mesa_glsl_parse_state *state, 3130 YYLTYPE *loc) 3131 { 3132 glsl_interp_mode interpolation; 3133 if (qual->flags.q.flat) 3134 interpolation = INTERP_MODE_FLAT; 3135 else if (qual->flags.q.noperspective) 3136 interpolation = INTERP_MODE_NOPERSPECTIVE; 3137 else if (qual->flags.q.smooth) 3138 interpolation = INTERP_MODE_SMOOTH; 3139 else 3140 interpolation = INTERP_MODE_NONE; 3141 3142 validate_interpolation_qualifier(state, loc, 3143 interpolation, 3144 qual, var_type, mode); 3145 3146 return interpolation; 3147 } 3148 3149 3150 static void 3151 apply_explicit_location(const struct ast_type_qualifier *qual, 3152 ir_variable *var, 3153 struct _mesa_glsl_parse_state *state, 3154 YYLTYPE *loc) 3155 { 3156 bool fail = false; 3157 3158 unsigned qual_location; 3159 if (!process_qualifier_constant(state, loc, "location", qual->location, 3160 &qual_location)) { 3161 return; 3162 } 3163 3164 /* Checks for GL_ARB_explicit_uniform_location. */ 3165 if (qual->flags.q.uniform) { 3166 if (!state->check_explicit_uniform_location_allowed(loc, var)) 3167 return; 3168 3169 const struct gl_context *const ctx = state->ctx; 3170 unsigned max_loc = qual_location + var->type->uniform_locations() - 1; 3171 3172 if (max_loc >= ctx->Const.MaxUserAssignableUniformLocations) { 3173 _mesa_glsl_error(loc, state, "location(s) consumed by uniform %s " 3174 ">= MAX_UNIFORM_LOCATIONS (%u)", var->name, 3175 ctx->Const.MaxUserAssignableUniformLocations); 3176 return; 3177 } 3178 3179 var->data.explicit_location = true; 3180 var->data.location = qual_location; 3181 return; 3182 } 3183 3184 /* Between GL_ARB_explicit_attrib_location an 3185 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader 3186 * stage can be assigned explicit locations. The checking here associates 3187 * the correct extension with the correct stage's input / output: 3188 * 3189 * input output 3190 * ----- ------ 3191 * vertex explicit_loc sso 3192 * tess control sso sso 3193 * tess eval sso sso 3194 * geometry sso sso 3195 * fragment sso explicit_loc 3196 */ 3197 switch (state->stage) { 3198 case MESA_SHADER_VERTEX: 3199 if (var->data.mode == ir_var_shader_in) { 3200 if (!state->check_explicit_attrib_location_allowed(loc, var)) 3201 return; 3202 3203 break; 3204 } 3205 3206 if (var->data.mode == ir_var_shader_out) { 3207 if (!state->check_separate_shader_objects_allowed(loc, var)) 3208 return; 3209 3210 break; 3211 } 3212 3213 fail = true; 3214 break; 3215 3216 case MESA_SHADER_TESS_CTRL: 3217 case MESA_SHADER_TESS_EVAL: 3218 case MESA_SHADER_GEOMETRY: 3219 if (var->data.mode == ir_var_shader_in || var->data.mode == ir_var_shader_out) { 3220 if (!state->check_separate_shader_objects_allowed(loc, var)) 3221 return; 3222 3223 break; 3224 } 3225 3226 fail = true; 3227 break; 3228 3229 case MESA_SHADER_FRAGMENT: 3230 if (var->data.mode == ir_var_shader_in) { 3231 if (!state->check_separate_shader_objects_allowed(loc, var)) 3232 return; 3233 3234 break; 3235 } 3236 3237 if (var->data.mode == ir_var_shader_out) { 3238 if (!state->check_explicit_attrib_location_allowed(loc, var)) 3239 return; 3240 3241 break; 3242 } 3243 3244 fail = true; 3245 break; 3246 3247 case MESA_SHADER_COMPUTE: 3248 _mesa_glsl_error(loc, state, 3249 "compute shader variables cannot be given " 3250 "explicit locations"); 3251 return; 3252 default: 3253 fail = true; 3254 break; 3255 }; 3256 3257 if (fail) { 3258 _mesa_glsl_error(loc, state, 3259 "%s cannot be given an explicit location in %s shader", 3260 mode_string(var), 3261 _mesa_shader_stage_to_string(state->stage)); 3262 } else { 3263 var->data.explicit_location = true; 3264 3265 switch (state->stage) { 3266 case MESA_SHADER_VERTEX: 3267 var->data.location = (var->data.mode == ir_var_shader_in) 3268 ? (qual_location + VERT_ATTRIB_GENERIC0) 3269 : (qual_location + VARYING_SLOT_VAR0); 3270 break; 3271 3272 case MESA_SHADER_TESS_CTRL: 3273 case MESA_SHADER_TESS_EVAL: 3274 case MESA_SHADER_GEOMETRY: 3275 if (var->data.patch) 3276 var->data.location = qual_location + VARYING_SLOT_PATCH0; 3277 else 3278 var->data.location = qual_location + VARYING_SLOT_VAR0; 3279 break; 3280 3281 case MESA_SHADER_FRAGMENT: 3282 var->data.location = (var->data.mode == ir_var_shader_out) 3283 ? (qual_location + FRAG_RESULT_DATA0) 3284 : (qual_location + VARYING_SLOT_VAR0); 3285 break; 3286 default: 3287 assert(!"Unexpected shader type"); 3288 break; 3289 } 3290 3291 /* Check if index was set for the uniform instead of the function */ 3292 if (qual->flags.q.explicit_index && qual->is_subroutine_decl()) { 3293 _mesa_glsl_error(loc, state, "an index qualifier can only be " 3294 "used with subroutine functions"); 3295 return; 3296 } 3297 3298 unsigned qual_index; 3299 if (qual->flags.q.explicit_index && 3300 process_qualifier_constant(state, loc, "index", qual->index, 3301 &qual_index)) { 3302 /* From the GLSL 4.30 specification, section 4.4.2 (Output 3303 * Layout Qualifiers): 3304 * 3305 * "It is also a compile-time error if a fragment shader 3306 * sets a layout index to less than 0 or greater than 1." 3307 * 3308 * Older specifications don't mandate a behavior; we take 3309 * this as a clarification and always generate the error. 3310 */ 3311 if (qual_index > 1) { 3312 _mesa_glsl_error(loc, state, 3313 "explicit index may only be 0 or 1"); 3314 } else { 3315 var->data.explicit_index = true; 3316 var->data.index = qual_index; 3317 } 3318 } 3319 } 3320 } 3321 3322 static bool 3323 validate_storage_for_sampler_image_types(ir_variable *var, 3324 struct _mesa_glsl_parse_state *state, 3325 YYLTYPE *loc) 3326 { 3327 /* From section 4.1.7 of the GLSL 4.40 spec: 3328 * 3329 * "[Opaque types] can only be declared as function 3330 * parameters or uniform-qualified variables." 3331 * 3332 * From section 4.1.7 of the ARB_bindless_texture spec: 3333 * 3334 * "Samplers may be declared as shader inputs and outputs, as uniform 3335 * variables, as temporary variables, and as function parameters." 3336 * 3337 * From section 4.1.X of the ARB_bindless_texture spec: 3338 * 3339 * "Images may be declared as shader inputs and outputs, as uniform 3340 * variables, as temporary variables, and as function parameters." 3341 */ 3342 if (state->has_bindless()) { 3343 if (var->data.mode != ir_var_auto && 3344 var->data.mode != ir_var_uniform && 3345 var->data.mode != ir_var_shader_in && 3346 var->data.mode != ir_var_shader_out && 3347 var->data.mode != ir_var_function_in && 3348 var->data.mode != ir_var_function_out && 3349 var->data.mode != ir_var_function_inout) { 3350 _mesa_glsl_error(loc, state, "bindless image/sampler variables may " 3351 "only be declared as shader inputs and outputs, as " 3352 "uniform variables, as temporary variables and as " 3353 "function parameters"); 3354 return false; 3355 } 3356 } else { 3357 if (var->data.mode != ir_var_uniform && 3358 var->data.mode != ir_var_function_in) { 3359 _mesa_glsl_error(loc, state, "image/sampler variables may only be " 3360 "declared as function parameters or " 3361 "uniform-qualified global variables"); 3362 return false; 3363 } 3364 } 3365 return true; 3366 } 3367 3368 static bool 3369 validate_memory_qualifier_for_type(struct _mesa_glsl_parse_state *state, 3370 YYLTYPE *loc, 3371 const struct ast_type_qualifier *qual, 3372 const glsl_type *type) 3373 { 3374 /* From Section 4.10 (Memory Qualifiers) of the GLSL 4.50 spec: 3375 * 3376 * "Memory qualifiers are only supported in the declarations of image 3377 * variables, buffer variables, and shader storage blocks; it is an error 3378 * to use such qualifiers in any other declarations. 3379 */ 3380 if (!type->is_image() && !qual->flags.q.buffer) { 3381 if (qual->flags.q.read_only || 3382 qual->flags.q.write_only || 3383 qual->flags.q.coherent || 3384 qual->flags.q._volatile || 3385 qual->flags.q.restrict_flag) { 3386 _mesa_glsl_error(loc, state, "memory qualifiers may only be applied " 3387 "in the declarations of image variables, buffer " 3388 "variables, and shader storage blocks"); 3389 return false; 3390 } 3391 } 3392 return true; 3393 } 3394 3395 static bool 3396 validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state *state, 3397 YYLTYPE *loc, 3398 const struct ast_type_qualifier *qual, 3399 const glsl_type *type) 3400 { 3401 /* From section 4.4.6.2 (Format Layout Qualifiers) of the GLSL 4.50 spec: 3402 * 3403 * "Format layout qualifiers can be used on image variable declarations 3404 * (those declared with a basic type having image in its keyword)." 3405 */ 3406 if (!type->is_image() && qual->flags.q.explicit_image_format) { 3407 _mesa_glsl_error(loc, state, "format layout qualifiers may only be " 3408 "applied to images"); 3409 return false; 3410 } 3411 return true; 3412 } 3413 3414 static void 3415 apply_image_qualifier_to_variable(const struct ast_type_qualifier *qual, 3416 ir_variable *var, 3417 struct _mesa_glsl_parse_state *state, 3418 YYLTYPE *loc) 3419 { 3420 const glsl_type *base_type = var->type->without_array(); 3421 3422 if (!validate_image_format_qualifier_for_type(state, loc, qual, base_type) || 3423 !validate_memory_qualifier_for_type(state, loc, qual, base_type)) 3424 return; 3425 3426 if (!base_type->is_image()) 3427 return; 3428 3429 if (!validate_storage_for_sampler_image_types(var, state, loc)) 3430 return; 3431 3432 var->data.memory_read_only |= qual->flags.q.read_only; 3433 var->data.memory_write_only |= qual->flags.q.write_only; 3434 var->data.memory_coherent |= qual->flags.q.coherent; 3435 var->data.memory_volatile |= qual->flags.q._volatile; 3436 var->data.memory_restrict |= qual->flags.q.restrict_flag; 3437 3438 if (qual->flags.q.explicit_image_format) { 3439 if (var->data.mode == ir_var_function_in) { 3440 _mesa_glsl_error(loc, state, "format qualifiers cannot be used on " 3441 "image function parameters"); 3442 } 3443 3444 if (qual->image_base_type != base_type->sampled_type) { 3445 _mesa_glsl_error(loc, state, "format qualifier doesn't match the base " 3446 "data type of the image"); 3447 } 3448 3449 var->data.image_format = qual->image_format; 3450 } else { 3451 if (var->data.mode == ir_var_uniform) { 3452 if (state->es_shader) { 3453 _mesa_glsl_error(loc, state, "all image uniforms must have a " 3454 "format layout qualifier"); 3455 } else if (!qual->flags.q.write_only) { 3456 _mesa_glsl_error(loc, state, "image uniforms not qualified with " 3457 "`writeonly' must have a format layout qualifier"); 3458 } 3459 } 3460 var->data.image_format = GL_NONE; 3461 } 3462 3463 /* From page 70 of the GLSL ES 3.1 specification: 3464 * 3465 * "Except for image variables qualified with the format qualifiers r32f, 3466 * r32i, and r32ui, image variables must specify either memory qualifier 3467 * readonly or the memory qualifier writeonly." 3468 */ 3469 if (state->es_shader && 3470 var->data.image_format != GL_R32F && 3471 var->data.image_format != GL_R32I && 3472 var->data.image_format != GL_R32UI && 3473 !var->data.memory_read_only && 3474 !var->data.memory_write_only) { 3475 _mesa_glsl_error(loc, state, "image variables of format other than r32f, " 3476 "r32i or r32ui must be qualified `readonly' or " 3477 "`writeonly'"); 3478 } 3479 } 3480 3481 static inline const char* 3482 get_layout_qualifier_string(bool origin_upper_left, bool pixel_center_integer) 3483 { 3484 if (origin_upper_left && pixel_center_integer) 3485 return "origin_upper_left, pixel_center_integer"; 3486 else if (origin_upper_left) 3487 return "origin_upper_left"; 3488 else if (pixel_center_integer) 3489 return "pixel_center_integer"; 3490 else 3491 return " "; 3492 } 3493 3494 static inline bool 3495 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state *state, 3496 const struct ast_type_qualifier *qual) 3497 { 3498 /* If gl_FragCoord was previously declared, and the qualifiers were 3499 * different in any way, return true. 3500 */ 3501 if (state->fs_redeclares_gl_fragcoord) { 3502 return (state->fs_pixel_center_integer != qual->flags.q.pixel_center_integer 3503 || state->fs_origin_upper_left != qual->flags.q.origin_upper_left); 3504 } 3505 3506 return false; 3507 } 3508 3509 static inline void 3510 validate_array_dimensions(const glsl_type *t, 3511 struct _mesa_glsl_parse_state *state, 3512 YYLTYPE *loc) { 3513 if (t->is_array()) { 3514 t = t->fields.array; 3515 while (t->is_array()) { 3516 if (t->is_unsized_array()) { 3517 _mesa_glsl_error(loc, state, 3518 "only the outermost array dimension can " 3519 "be unsized", 3520 t->name); 3521 break; 3522 } 3523 t = t->fields.array; 3524 } 3525 } 3526 } 3527 3528 static void 3529 apply_bindless_qualifier_to_variable(const struct ast_type_qualifier *qual, 3530 ir_variable *var, 3531 struct _mesa_glsl_parse_state *state, 3532 YYLTYPE *loc) 3533 { 3534 bool has_local_qualifiers = qual->flags.q.bindless_sampler || 3535 qual->flags.q.bindless_image || 3536 qual->flags.q.bound_sampler || 3537 qual->flags.q.bound_image; 3538 3539 /* The ARB_bindless_texture spec says: 3540 * 3541 * "Modify Section 4.4.6 Opaque-Uniform Layout Qualifiers of the GLSL 4.30 3542 * spec" 3543 * 3544 * "If these layout qualifiers are applied to other types of default block 3545 * uniforms, or variables with non-uniform storage, a compile-time error 3546 * will be generated." 3547 */ 3548 if (has_local_qualifiers && !qual->flags.q.uniform) { 3549 _mesa_glsl_error(loc, state, "ARB_bindless_texture layout qualifiers " 3550 "can only be applied to default block uniforms or " 3551 "variables with uniform storage"); 3552 return; 3553 } 3554 3555 /* The ARB_bindless_texture spec doesn't state anything in this situation, 3556 * but it makes sense to only allow bindless_sampler/bound_sampler for 3557 * sampler types, and respectively bindless_image/bound_image for image 3558 * types. 3559 */ 3560 if ((qual->flags.q.bindless_sampler || qual->flags.q.bound_sampler) && 3561 !var->type->contains_sampler()) { 3562 _mesa_glsl_error(loc, state, "bindless_sampler or bound_sampler can only " 3563 "be applied to sampler types"); 3564 return; 3565 } 3566 3567 if ((qual->flags.q.bindless_image || qual->flags.q.bound_image) && 3568 !var->type->contains_image()) { 3569 _mesa_glsl_error(loc, state, "bindless_image or bound_image can only be " 3570 "applied to image types"); 3571 return; 3572 } 3573 3574 /* The bindless_sampler/bindless_image (and respectively 3575 * bound_sampler/bound_image) layout qualifiers can be set at global and at 3576 * local scope. 3577 */ 3578 if (var->type->contains_sampler() || var->type->contains_image()) { 3579 var->data.bindless = qual->flags.q.bindless_sampler || 3580 qual->flags.q.bindless_image || 3581 state->bindless_sampler_specified || 3582 state->bindless_image_specified; 3583 3584 var->data.bound = qual->flags.q.bound_sampler || 3585 qual->flags.q.bound_image || 3586 state->bound_sampler_specified || 3587 state->bound_image_specified; 3588 } 3589 } 3590 3591 static void 3592 apply_layout_qualifier_to_variable(const struct ast_type_qualifier *qual, 3593 ir_variable *var, 3594 struct _mesa_glsl_parse_state *state, 3595 YYLTYPE *loc) 3596 { 3597 if (var->name != NULL && strcmp(var->name, "gl_FragCoord") == 0) { 3598 3599 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says: 3600 * 3601 * "Within any shader, the first redeclarations of gl_FragCoord 3602 * must appear before any use of gl_FragCoord." 3603 * 3604 * Generate a compiler error if above condition is not met by the 3605 * fragment shader. 3606 */ 3607 ir_variable *earlier = state->symbols->get_variable("gl_FragCoord"); 3608 if (earlier != NULL && 3609 earlier->data.used && 3610 !state->fs_redeclares_gl_fragcoord) { 3611 _mesa_glsl_error(loc, state, 3612 "gl_FragCoord used before its first redeclaration " 3613 "in fragment shader"); 3614 } 3615 3616 /* Make sure all gl_FragCoord redeclarations specify the same layout 3617 * qualifiers. 3618 */ 3619 if (is_conflicting_fragcoord_redeclaration(state, qual)) { 3620 const char *const qual_string = 3621 get_layout_qualifier_string(qual->flags.q.origin_upper_left, 3622 qual->flags.q.pixel_center_integer); 3623 3624 const char *const state_string = 3625 get_layout_qualifier_string(state->fs_origin_upper_left, 3626 state->fs_pixel_center_integer); 3627 3628 _mesa_glsl_error(loc, state, 3629 "gl_FragCoord redeclared with different layout " 3630 "qualifiers (%s) and (%s) ", 3631 state_string, 3632 qual_string); 3633 } 3634 state->fs_origin_upper_left = qual->flags.q.origin_upper_left; 3635 state->fs_pixel_center_integer = qual->flags.q.pixel_center_integer; 3636 state->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers = 3637 !qual->flags.q.origin_upper_left && !qual->flags.q.pixel_center_integer; 3638 state->fs_redeclares_gl_fragcoord = 3639 state->fs_origin_upper_left || 3640 state->fs_pixel_center_integer || 3641 state->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers; 3642 } 3643 3644 var->data.pixel_center_integer = qual->flags.q.pixel_center_integer; 3645 var->data.origin_upper_left = qual->flags.q.origin_upper_left; 3646 if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer) 3647 && (strcmp(var->name, "gl_FragCoord") != 0)) { 3648 const char *const qual_string = (qual->flags.q.origin_upper_left) 3649 ? "origin_upper_left" : "pixel_center_integer"; 3650 3651 _mesa_glsl_error(loc, state, 3652 "layout qualifier `%s' can only be applied to " 3653 "fragment shader input `gl_FragCoord'", 3654 qual_string); 3655 } 3656 3657 if (qual->flags.q.explicit_location) { 3658 apply_explicit_location(qual, var, state, loc); 3659 3660 if (qual->flags.q.explicit_component) { 3661 unsigned qual_component; 3662 if (process_qualifier_constant(state, loc, "component", 3663 qual->component, &qual_component)) { 3664 const glsl_type *type = var->type->without_array(); 3665 unsigned components = type->component_slots(); 3666 3667 if (type->is_matrix() || type->is_record()) { 3668 _mesa_glsl_error(loc, state, "component layout qualifier " 3669 "cannot be applied to a matrix, a structure, " 3670 "a block, or an array containing any of " 3671 "these."); 3672 } else if (qual_component != 0 && 3673 (qual_component + components - 1) > 3) { 3674 _mesa_glsl_error(loc, state, "component overflow (%u > 3)", 3675 (qual_component + components - 1)); 3676 } else if (qual_component == 1 && type->is_64bit()) { 3677 /* We don't bother checking for 3 as it should be caught by the 3678 * overflow check above. 3679 */ 3680 _mesa_glsl_error(loc, state, "doubles cannot begin at " 3681 "component 1 or 3"); 3682 } else { 3683 var->data.explicit_component = true; 3684 var->data.location_frac = qual_component; 3685 } 3686 } 3687 } 3688 } else if (qual->flags.q.explicit_index) { 3689 if (!qual->subroutine_list) 3690 _mesa_glsl_error(loc, state, 3691 "explicit index requires explicit location"); 3692 } else if (qual->flags.q.explicit_component) { 3693 _mesa_glsl_error(loc, state, 3694 "explicit component requires explicit location"); 3695 } 3696 3697 if (qual->flags.q.explicit_binding) { 3698 apply_explicit_binding(state, loc, var, var->type, qual); 3699 } 3700 3701 if (state->stage == MESA_SHADER_GEOMETRY && 3702 qual->flags.q.out && qual->flags.q.stream) { 3703 unsigned qual_stream; 3704 if (process_qualifier_constant(state, loc, "stream", qual->stream, 3705 &qual_stream) && 3706 validate_stream_qualifier(loc, state, qual_stream)) { 3707 var->data.stream = qual_stream; 3708 } 3709 } 3710 3711 if (qual->flags.q.out && qual->flags.q.xfb_buffer) { 3712 unsigned qual_xfb_buffer; 3713 if (process_qualifier_constant(state, loc, "xfb_buffer", 3714 qual->xfb_buffer, &qual_xfb_buffer) && 3715 validate_xfb_buffer_qualifier(loc, state, qual_xfb_buffer)) { 3716 var->data.xfb_buffer = qual_xfb_buffer; 3717 if (qual->flags.q.explicit_xfb_buffer) 3718 var->data.explicit_xfb_buffer = true; 3719 } 3720 } 3721 3722 if (qual->flags.q.explicit_xfb_offset) { 3723 unsigned qual_xfb_offset; 3724 unsigned component_size = var->type->contains_double() ? 8 : 4; 3725 3726 if (process_qualifier_constant(state, loc, "xfb_offset", 3727 qual->offset, &qual_xfb_offset) && 3728 validate_xfb_offset_qualifier(loc, state, (int) qual_xfb_offset, 3729 var->type, component_size)) { 3730 var->data.offset = qual_xfb_offset; 3731 var->data.explicit_xfb_offset = true; 3732 } 3733 } 3734 3735 if (qual->flags.q.explicit_xfb_stride) { 3736 unsigned qual_xfb_stride; 3737 if (process_qualifier_constant(state, loc, "xfb_stride", 3738 qual->xfb_stride, &qual_xfb_stride)) { 3739 var->data.xfb_stride = qual_xfb_stride; 3740 var->data.explicit_xfb_stride = true; 3741 } 3742 } 3743 3744 if (var->type->contains_atomic()) { 3745 if (var->data.mode == ir_var_uniform) { 3746 if (var->data.explicit_binding) { 3747 unsigned *offset = 3748 &state->atomic_counter_offsets[var->data.binding]; 3749 3750 if (*offset % ATOMIC_COUNTER_SIZE) 3751 _mesa_glsl_error(loc, state, 3752 "misaligned atomic counter offset"); 3753 3754 var->data.offset = *offset; 3755 *offset += var->type->atomic_size(); 3756 3757 } else { 3758 _mesa_glsl_error(loc, state, 3759 "atomic counters require explicit binding point"); 3760 } 3761 } else if (var->data.mode != ir_var_function_in) { 3762 _mesa_glsl_error(loc, state, "atomic counters may only be declared as " 3763 "function parameters or uniform-qualified " 3764 "global variables"); 3765 } 3766 } 3767 3768 if (var->type->contains_sampler() && 3769 !validate_storage_for_sampler_image_types(var, state, loc)) 3770 return; 3771 3772 /* Is the 'layout' keyword used with parameters that allow relaxed checking. 3773 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some 3774 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable 3775 * allowed the layout qualifier to be used with 'varying' and 'attribute'. 3776 * These extensions and all following extensions that add the 'layout' 3777 * keyword have been modified to require the use of 'in' or 'out'. 3778 * 3779 * The following extension do not allow the deprecated keywords: 3780 * 3781 * GL_AMD_conservative_depth 3782 * GL_ARB_conservative_depth 3783 * GL_ARB_gpu_shader5 3784 * GL_ARB_separate_shader_objects 3785 * GL_ARB_tessellation_shader 3786 * GL_ARB_transform_feedback3 3787 * GL_ARB_uniform_buffer_object 3788 * 3789 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5 3790 * allow layout with the deprecated keywords. 3791 */ 3792 const bool relaxed_layout_qualifier_checking = 3793 state->ARB_fragment_coord_conventions_enable; 3794 3795 const bool uses_deprecated_qualifier = qual->flags.q.attribute 3796 || qual->flags.q.varying; 3797 if (qual->has_layout() && uses_deprecated_qualifier) { 3798 if (relaxed_layout_qualifier_checking) { 3799 _mesa_glsl_warning(loc, state, 3800 "`layout' qualifier may not be used with " 3801 "`attribute' or `varying'"); 3802 } else { 3803 _mesa_glsl_error(loc, state, 3804 "`layout' qualifier may not be used with " 3805 "`attribute' or `varying'"); 3806 } 3807 } 3808 3809 /* Layout qualifiers for gl_FragDepth, which are enabled by extension 3810 * AMD_conservative_depth. 3811 */ 3812 if (qual->flags.q.depth_type 3813 && !state->is_version(420, 0) 3814 && !state->AMD_conservative_depth_enable 3815 && !state->ARB_conservative_depth_enable) { 3816 _mesa_glsl_error(loc, state, 3817 "extension GL_AMD_conservative_depth or " 3818 "GL_ARB_conservative_depth must be enabled " 3819 "to use depth layout qualifiers"); 3820 } else if (qual->flags.q.depth_type 3821 && strcmp(var->name, "gl_FragDepth") != 0) { 3822 _mesa_glsl_error(loc, state, 3823 "depth layout qualifiers can be applied only to " 3824 "gl_FragDepth"); 3825 } 3826 3827 switch (qual->depth_type) { 3828 case ast_depth_any: 3829 var->data.depth_layout = ir_depth_layout_any; 3830 break; 3831 case ast_depth_greater: 3832 var->data.depth_layout = ir_depth_layout_greater; 3833 break; 3834 case ast_depth_less: 3835 var->data.depth_layout = ir_depth_layout_less; 3836 break; 3837 case ast_depth_unchanged: 3838 var->data.depth_layout = ir_depth_layout_unchanged; 3839 break; 3840 default: 3841 var->data.depth_layout = ir_depth_layout_none; 3842 break; 3843 } 3844 3845 if (qual->flags.q.std140 || 3846 qual->flags.q.std430 || 3847 qual->flags.q.packed || 3848 qual->flags.q.shared) { 3849 _mesa_glsl_error(loc, state, 3850 "uniform and shader storage block layout qualifiers " 3851 "std140, std430, packed, and shared can only be " 3852 "applied to uniform or shader storage blocks, not " 3853 "members"); 3854 } 3855 3856 if (qual->flags.q.row_major || qual->flags.q.column_major) { 3857 validate_matrix_layout_for_type(state, loc, var->type, var); 3858 } 3859 3860 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader 3861 * Inputs): 3862 * 3863 * "Fragment shaders also allow the following layout qualifier on in only 3864 * (not with variable declarations) 3865 * layout-qualifier-id 3866 * early_fragment_tests 3867 * [...]" 3868 */ 3869 if (qual->flags.q.early_fragment_tests) { 3870 _mesa_glsl_error(loc, state, "early_fragment_tests layout qualifier only " 3871 "valid in fragment shader input layout declaration."); 3872 } 3873 3874 if (qual->flags.q.inner_coverage) { 3875 _mesa_glsl_error(loc, state, "inner_coverage layout qualifier only " 3876 "valid in fragment shader input layout declaration."); 3877 } 3878 3879 if (qual->flags.q.post_depth_coverage) { 3880 _mesa_glsl_error(loc, state, "post_depth_coverage layout qualifier only " 3881 "valid in fragment shader input layout declaration."); 3882 } 3883 3884 if (state->has_bindless()) 3885 apply_bindless_qualifier_to_variable(qual, var, state, loc); 3886 } 3887 3888 static void 3889 apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual, 3890 ir_variable *var, 3891 struct _mesa_glsl_parse_state *state, 3892 YYLTYPE *loc, 3893 bool is_parameter) 3894 { 3895 STATIC_ASSERT(sizeof(qual->flags.q) <= sizeof(qual->flags.i)); 3896 3897 if (qual->flags.q.invariant) { 3898 if (var->data.used) { 3899 _mesa_glsl_error(loc, state, 3900 "variable `%s' may not be redeclared " 3901 "`invariant' after being used", 3902 var->name); 3903 } else { 3904 var->data.invariant = 1; 3905 } 3906 } 3907 3908 if (qual->flags.q.precise) { 3909 if (var->data.used) { 3910 _mesa_glsl_error(loc, state, 3911 "variable `%s' may not be redeclared " 3912 "`precise' after being used", 3913 var->name); 3914 } else { 3915 var->data.precise = 1; 3916 } 3917 } 3918 3919 if (qual->is_subroutine_decl() && !qual->flags.q.uniform) { 3920 _mesa_glsl_error(loc, state, 3921 "`subroutine' may only be applied to uniforms, " 3922 "subroutine type declarations, or function definitions"); 3923 } 3924 3925 if (qual->flags.q.constant || qual->flags.q.attribute 3926 || qual->flags.q.uniform 3927 || (qual->flags.q.varying && (state->stage == MESA_SHADER_FRAGMENT))) 3928 var->data.read_only = 1; 3929 3930 if (qual->flags.q.centroid) 3931 var->data.centroid = 1; 3932 3933 if (qual->flags.q.sample) 3934 var->data.sample = 1; 3935 3936 /* Precision qualifiers do not hold any meaning in Desktop GLSL */ 3937 if (state->es_shader) { 3938 var->data.precision = 3939 select_gles_precision(qual->precision, var->type, state, loc); 3940 } 3941 3942 if (qual->flags.q.patch) 3943 var->data.patch = 1; 3944 3945 if (qual->flags.q.attribute && state->stage != MESA_SHADER_VERTEX) { 3946 var->type = glsl_type::error_type; 3947 _mesa_glsl_error(loc, state, 3948 "`attribute' variables may not be declared in the " 3949 "%s shader", 3950 _mesa_shader_stage_to_string(state->stage)); 3951 } 3952 3953 /* Disallow layout qualifiers which may only appear on layout declarations. */ 3954 if (qual->flags.q.prim_type) { 3955 _mesa_glsl_error(loc, state, 3956 "Primitive type may only be specified on GS input or output " 3957 "layout declaration, not on variables."); 3958 } 3959 3960 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says: 3961 * 3962 * "However, the const qualifier cannot be used with out or inout." 3963 * 3964 * The same section of the GLSL 4.40 spec further clarifies this saying: 3965 * 3966 * "The const qualifier cannot be used with out or inout, or a 3967 * compile-time error results." 3968 */ 3969 if (is_parameter && qual->flags.q.constant && qual->flags.q.out) { 3970 _mesa_glsl_error(loc, state, 3971 "`const' may not be applied to `out' or `inout' " 3972 "function parameters"); 3973 } 3974 3975 /* If there is no qualifier that changes the mode of the variable, leave 3976 * the setting alone. 3977 */ 3978 assert(var->data.mode != ir_var_temporary); 3979 if (qual->flags.q.in && qual->flags.q.out) 3980 var->data.mode = is_parameter ? ir_var_function_inout : ir_var_shader_out; 3981 else if (qual->flags.q.in) 3982 var->data.mode = is_parameter ? ir_var_function_in : ir_var_shader_in; 3983 else if (qual->flags.q.attribute 3984 || (qual->flags.q.varying && (state->stage == MESA_SHADER_FRAGMENT))) 3985 var->data.mode = ir_var_shader_in; 3986 else if (qual->flags.q.out) 3987 var->data.mode = is_parameter ? ir_var_function_out : ir_var_shader_out; 3988 else if (qual->flags.q.varying && (state->stage == MESA_SHADER_VERTEX)) 3989 var->data.mode = ir_var_shader_out; 3990 else if (qual->flags.q.uniform) 3991 var->data.mode = ir_var_uniform; 3992 else if (qual->flags.q.buffer) 3993 var->data.mode = ir_var_shader_storage; 3994 else if (qual->flags.q.shared_storage) 3995 var->data.mode = ir_var_shader_shared; 3996 3997 var->data.fb_fetch_output = state->stage == MESA_SHADER_FRAGMENT && 3998 qual->flags.q.in && qual->flags.q.out; 3999 4000 if (!is_parameter && is_varying_var(var, state->stage)) { 4001 /* User-defined ins/outs are not permitted in compute shaders. */ 4002 if (state->stage == MESA_SHADER_COMPUTE) { 4003 _mesa_glsl_error(loc, state, 4004 "user-defined input and output variables are not " 4005 "permitted in compute shaders"); 4006 } 4007 4008 /* This variable is being used to link data between shader stages (in 4009 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type 4010 * that is allowed for such purposes. 4011 * 4012 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec: 4013 * 4014 * "The varying qualifier can be used only with the data types 4015 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of 4016 * these." 4017 * 4018 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From 4019 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec: 4020 * 4021 * "Fragment inputs can only be signed and unsigned integers and 4022 * integer vectors, float, floating-point vectors, matrices, or 4023 * arrays of these. Structures cannot be input. 4024 * 4025 * Similar text exists in the section on vertex shader outputs. 4026 * 4027 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES 4028 * 3.00 spec allows structs as well. Varying structs are also allowed 4029 * in GLSL 1.50. 4030 * 4031 * From section 4.3.4 of the ARB_bindless_texture spec: 4032 * 4033 * "(modify third paragraph of the section to allow sampler and image 4034 * types) ... Vertex shader inputs can only be float, 4035 * single-precision floating-point scalars, single-precision 4036 * floating-point vectors, matrices, signed and unsigned integers 4037 * and integer vectors, sampler and image types." 4038 * 4039 * From section 4.3.6 of the ARB_bindless_texture spec: 4040 * 4041 * "Output variables can only be floating-point scalars, 4042 * floating-point vectors, matrices, signed or unsigned integers or 4043 * integer vectors, sampler or image types, or arrays or structures 4044 * of any these." 4045 */ 4046 switch (var->type->without_array()->base_type) { 4047 case GLSL_TYPE_FLOAT: 4048 /* Ok in all GLSL versions */ 4049 break; 4050 case GLSL_TYPE_UINT: 4051 case GLSL_TYPE_INT: 4052 if (state->is_version(130, 300)) 4053 break; 4054 _mesa_glsl_error(loc, state, 4055 "varying variables must be of base type float in %s", 4056 state->get_version_string()); 4057 break; 4058 case GLSL_TYPE_STRUCT: 4059 if (state->is_version(150, 300)) 4060 break; 4061 _mesa_glsl_error(loc, state, 4062 "varying variables may not be of type struct"); 4063 break; 4064 case GLSL_TYPE_DOUBLE: 4065 case GLSL_TYPE_UINT64: 4066 case GLSL_TYPE_INT64: 4067 break; 4068 case GLSL_TYPE_SAMPLER: 4069 case GLSL_TYPE_IMAGE: 4070 if (state->has_bindless()) 4071 break; 4072 /* fallthrough */ 4073 default: 4074 _mesa_glsl_error(loc, state, "illegal type for a varying variable"); 4075 break; 4076 } 4077 } 4078 4079 if (state->all_invariant && var->data.mode == ir_var_shader_out) 4080 var->data.invariant = true; 4081 4082 var->data.interpolation = 4083 interpret_interpolation_qualifier(qual, var->type, 4084 (ir_variable_mode) var->data.mode, 4085 state, loc); 4086 4087 /* Does the declaration use the deprecated 'attribute' or 'varying' 4088 * keywords? 4089 */ 4090 const bool uses_deprecated_qualifier = qual->flags.q.attribute 4091 || qual->flags.q.varying; 4092 4093 4094 /* Validate auxiliary storage qualifiers */ 4095 4096 /* From section 4.3.4 of the GLSL 1.30 spec: 4097 * "It is an error to use centroid in in a vertex shader." 4098 * 4099 * From section 4.3.4 of the GLSL ES 3.00 spec: 4100 * "It is an error to use centroid in or interpolation qualifiers in 4101 * a vertex shader input." 4102 */ 4103 4104 /* Section 4.3.6 of the GLSL 1.30 specification states: 4105 * "It is an error to use centroid out in a fragment shader." 4106 * 4107 * The GL_ARB_shading_language_420pack extension specification states: 4108 * "It is an error to use auxiliary storage qualifiers or interpolation 4109 * qualifiers on an output in a fragment shader." 4110 */ 4111 if (qual->flags.q.sample && (!is_varying_var(var, state->stage) || uses_deprecated_qualifier)) { 4112 _mesa_glsl_error(loc, state, 4113 "sample qualifier may only be used on `in` or `out` " 4114 "variables between shader stages"); 4115 } 4116 if (qual->flags.q.centroid && !is_varying_var(var, state->stage)) { 4117 _mesa_glsl_error(loc, state, 4118 "centroid qualifier may only be used with `in', " 4119 "`out' or `varying' variables between shader stages"); 4120 } 4121 4122 if (qual->flags.q.shared_storage && state->stage != MESA_SHADER_COMPUTE) { 4123 _mesa_glsl_error(loc, state, 4124 "the shared storage qualifiers can only be used with " 4125 "compute shaders"); 4126 } 4127 4128 apply_image_qualifier_to_variable(qual, var, state, loc); 4129 } 4130 4131 /** 4132 * Get the variable that is being redeclared by this declaration or if it 4133 * does not exist, the current declared variable. 4134 * 4135 * Semantic checks to verify the validity of the redeclaration are also 4136 * performed. If semantic checks fail, compilation error will be emitted via 4137 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned. 4138 * 4139 * \returns 4140 * A pointer to an existing variable in the current scope if the declaration 4141 * is a redeclaration, current variable otherwise. \c is_declared boolean 4142 * will return \c true if the declaration is a redeclaration, \c false 4143 * otherwise. 4144 */ 4145 static ir_variable * 4146 get_variable_being_redeclared(ir_variable **var_ptr, YYLTYPE loc, 4147 struct _mesa_glsl_parse_state *state, 4148 bool allow_all_redeclarations, 4149 bool *is_redeclaration) 4150 { 4151 ir_variable *var = *var_ptr; 4152 4153 /* Check if this declaration is actually a re-declaration, either to 4154 * resize an array or add qualifiers to an existing variable. 4155 * 4156 * This is allowed for variables in the current scope, or when at 4157 * global scope (for built-ins in the implicit outer scope). 4158 */ 4159 ir_variable *earlier = state->symbols->get_variable(var->name); 4160 if (earlier == NULL || 4161 (state->current_function != NULL && 4162 !state->symbols->name_declared_this_scope(var->name))) { 4163 *is_redeclaration = false; 4164 return var; 4165 } 4166 4167 *is_redeclaration = true; 4168 4169 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec, 4170 * 4171 * "It is legal to declare an array without a size and then 4172 * later re-declare the same name as an array of the same 4173 * type and specify a size." 4174 */ 4175 if (earlier->type->is_unsized_array() && var->type->is_array() 4176 && (var->type->fields.array == earlier->type->fields.array)) { 4177 /* FINISHME: This doesn't match the qualifiers on the two 4178 * FINISHME: declarations. It's not 100% clear whether this is 4179 * FINISHME: required or not. 4180 */ 4181 4182 const int size = var->type->array_size(); 4183 check_builtin_array_max_size(var->name, size, loc, state); 4184 if ((size > 0) && (size <= earlier->data.max_array_access)) { 4185 _mesa_glsl_error(& loc, state, "array size must be > %u due to " 4186 "previous access", 4187 earlier->data.max_array_access); 4188 } 4189 4190 earlier->type = var->type; 4191 delete var; 4192 var = NULL; 4193 *var_ptr = NULL; 4194 } else if ((state->ARB_fragment_coord_conventions_enable || 4195 state->is_version(150, 0)) 4196 && strcmp(var->name, "gl_FragCoord") == 0 4197 && earlier->type == var->type 4198 && var->data.mode == ir_var_shader_in) { 4199 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout 4200 * qualifiers. 4201 */ 4202 earlier->data.origin_upper_left = var->data.origin_upper_left; 4203 earlier->data.pixel_center_integer = var->data.pixel_center_integer; 4204 4205 /* According to section 4.3.7 of the GLSL 1.30 spec, 4206 * the following built-in varaibles can be redeclared with an 4207 * interpolation qualifier: 4208 * * gl_FrontColor 4209 * * gl_BackColor 4210 * * gl_FrontSecondaryColor 4211 * * gl_BackSecondaryColor 4212 * * gl_Color 4213 * * gl_SecondaryColor 4214 */ 4215 } else if (state->is_version(130, 0) 4216 && (strcmp(var->name, "gl_FrontColor") == 0 4217 || strcmp(var->name, "gl_BackColor") == 0 4218 || strcmp(var->name, "gl_FrontSecondaryColor") == 0 4219 || strcmp(var->name, "gl_BackSecondaryColor") == 0 4220 || strcmp(var->name, "gl_Color") == 0 4221 || strcmp(var->name, "gl_SecondaryColor") == 0) 4222 && earlier->type == var->type 4223 && earlier->data.mode == var->data.mode) { 4224 earlier->data.interpolation = var->data.interpolation; 4225 4226 /* Layout qualifiers for gl_FragDepth. */ 4227 } else if ((state->is_version(420, 0) || 4228 state->AMD_conservative_depth_enable || 4229 state->ARB_conservative_depth_enable) 4230 && strcmp(var->name, "gl_FragDepth") == 0 4231 && earlier->type == var->type 4232 && earlier->data.mode == var->data.mode) { 4233 4234 /** From the AMD_conservative_depth spec: 4235 * Within any shader, the first redeclarations of gl_FragDepth 4236 * must appear before any use of gl_FragDepth. 4237 */ 4238 if (earlier->data.used) { 4239 _mesa_glsl_error(&loc, state, 4240 "the first redeclaration of gl_FragDepth " 4241 "must appear before any use of gl_FragDepth"); 4242 } 4243 4244 /* Prevent inconsistent redeclaration of depth layout qualifier. */ 4245 if (earlier->data.depth_layout != ir_depth_layout_none 4246 && earlier->data.depth_layout != var->data.depth_layout) { 4247 _mesa_glsl_error(&loc, state, 4248 "gl_FragDepth: depth layout is declared here " 4249 "as '%s, but it was previously declared as " 4250 "'%s'", 4251 depth_layout_string(var->data.depth_layout), 4252 depth_layout_string(earlier->data.depth_layout)); 4253 } 4254 4255 earlier->data.depth_layout = var->data.depth_layout; 4256 4257 } else if (state->has_framebuffer_fetch() && 4258 strcmp(var->name, "gl_LastFragData") == 0 && 4259 var->type == earlier->type && 4260 var->data.mode == ir_var_auto) { 4261 /* According to the EXT_shader_framebuffer_fetch spec: 4262 * 4263 * "By default, gl_LastFragData is declared with the mediump precision 4264 * qualifier. This can be changed by redeclaring the corresponding 4265 * variables with the desired precision qualifier." 4266 */ 4267 earlier->data.precision = var->data.precision; 4268 4269 } else if (earlier->data.how_declared == ir_var_declared_implicitly && 4270 state->allow_builtin_variable_redeclaration) { 4271 /* Allow verbatim redeclarations of built-in variables. Not explicitly 4272 * valid, but some applications do it. 4273 */ 4274 if (earlier->data.mode != var->data.mode && 4275 !(earlier->data.mode == ir_var_system_value && 4276 var->data.mode == ir_var_shader_in)) { 4277 _mesa_glsl_error(&loc, state, 4278 "redeclaration of `%s' with incorrect qualifiers", 4279 var->name); 4280 } else if (earlier->type != var->type) { 4281 _mesa_glsl_error(&loc, state, 4282 "redeclaration of `%s' has incorrect type", 4283 var->name); 4284 } 4285 } else if (allow_all_redeclarations) { 4286 if (earlier->data.mode != var->data.mode) { 4287 _mesa_glsl_error(&loc, state, 4288 "redeclaration of `%s' with incorrect qualifiers", 4289 var->name); 4290 } else if (earlier->type != var->type) { 4291 _mesa_glsl_error(&loc, state, 4292 "redeclaration of `%s' has incorrect type", 4293 var->name); 4294 } 4295 } else { 4296 _mesa_glsl_error(&loc, state, "`%s' redeclared", var->name); 4297 } 4298 4299 return earlier; 4300 } 4301 4302 /** 4303 * Generate the IR for an initializer in a variable declaration 4304 */ 4305 static ir_rvalue * 4306 process_initializer(ir_variable *var, ast_declaration *decl, 4307 ast_fully_specified_type *type, 4308 exec_list *initializer_instructions, 4309 struct _mesa_glsl_parse_state *state) 4310 { 4311 void *mem_ctx = state; 4312 ir_rvalue *result = NULL; 4313 4314 YYLTYPE initializer_loc = decl->initializer->get_location(); 4315 4316 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec: 4317 * 4318 * "All uniform variables are read-only and are initialized either 4319 * directly by an application via API commands, or indirectly by 4320 * OpenGL." 4321 */ 4322 if (var->data.mode == ir_var_uniform) { 4323 state->check_version(120, 0, &initializer_loc, 4324 "cannot initialize uniform %s", 4325 var->name); 4326 } 4327 4328 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec: 4329 * 4330 * "Buffer variables cannot have initializers." 4331 */ 4332 if (var->data.mode == ir_var_shader_storage) { 4333 _mesa_glsl_error(&initializer_loc, state, 4334 "cannot initialize buffer variable %s", 4335 var->name); 4336 } 4337 4338 /* From section 4.1.7 of the GLSL 4.40 spec: 4339 * 4340 * "Opaque variables [...] are initialized only through the 4341 * OpenGL API; they cannot be declared with an initializer in a 4342 * shader." 4343 * 4344 * From section 4.1.7 of the ARB_bindless_texture spec: 4345 * 4346 * "Samplers may be declared as shader inputs and outputs, as uniform 4347 * variables, as temporary variables, and as function parameters." 4348 * 4349 * From section 4.1.X of the ARB_bindless_texture spec: 4350 * 4351 * "Images may be declared as shader inputs and outputs, as uniform 4352 * variables, as temporary variables, and as function parameters." 4353 */ 4354 if (var->type->contains_atomic() || 4355 (!state->has_bindless() && var->type->contains_opaque())) { 4356 _mesa_glsl_error(&initializer_loc, state, 4357 "cannot initialize %s variable %s", 4358 var->name, state->has_bindless() ? "atomic" : "opaque"); 4359 } 4360 4361 if ((var->data.mode == ir_var_shader_in) && (state->current_function == NULL)) { 4362 _mesa_glsl_error(&initializer_loc, state, 4363 "cannot initialize %s shader input / %s %s", 4364 _mesa_shader_stage_to_string(state->stage), 4365 (state->stage == MESA_SHADER_VERTEX) 4366 ? "attribute" : "varying", 4367 var->name); 4368 } 4369 4370 if (var->data.mode == ir_var_shader_out && state->current_function == NULL) { 4371 _mesa_glsl_error(&initializer_loc, state, 4372 "cannot initialize %s shader output %s", 4373 _mesa_shader_stage_to_string(state->stage), 4374 var->name); 4375 } 4376 4377 /* If the initializer is an ast_aggregate_initializer, recursively store 4378 * type information from the LHS into it, so that its hir() function can do 4379 * type checking. 4380 */ 4381 if (decl->initializer->oper == ast_aggregate) 4382 _mesa_ast_set_aggregate_type(var->type, decl->initializer); 4383 4384 ir_dereference *const lhs = new(state) ir_dereference_variable(var); 4385 ir_rvalue *rhs = decl->initializer->hir(initializer_instructions, state); 4386 4387 /* Calculate the constant value if this is a const or uniform 4388 * declaration. 4389 * 4390 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says: 4391 * 4392 * "Declarations of globals without a storage qualifier, or with 4393 * just the const qualifier, may include initializers, in which case 4394 * they will be initialized before the first line of main() is 4395 * executed. Such initializers must be a constant expression." 4396 * 4397 * The same section of the GLSL ES 3.00.4 spec has similar language. 4398 */ 4399 if (type->qualifier.flags.q.constant 4400 || type->qualifier.flags.q.uniform 4401 || (state->es_shader && state->current_function == NULL)) { 4402 ir_rvalue *new_rhs = validate_assignment(state, initializer_loc, 4403 lhs, rhs, true); 4404 if (new_rhs != NULL) { 4405 rhs = new_rhs; 4406 4407 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec 4408 * says: 4409 * 4410 * "A constant expression is one of 4411 * 4412 * ... 4413 * 4414 * - an expression formed by an operator on operands that are 4415 * all constant expressions, including getting an element of 4416 * a constant array, or a field of a constant structure, or 4417 * components of a constant vector. However, the sequence 4418 * operator ( , ) and the assignment operators ( =, +=, ...) 4419 * are not included in the operators that can create a 4420 * constant expression." 4421 * 4422 * Section 12.43 (Sequence operator and constant expressions) says: 4423 * 4424 * "Should the following construct be allowed? 4425 * 4426 * float a[2,3]; 4427 * 4428 * The expression within the brackets uses the sequence operator 4429 * (',') and returns the integer 3 so the construct is declaring 4430 * a single-dimensional array of size 3. In some languages, the 4431 * construct declares a two-dimensional array. It would be 4432 * preferable to make this construct illegal to avoid confusion. 4433 * 4434 * One possibility is to change the definition of the sequence 4435 * operator so that it does not return a constant-expression and 4436 * hence cannot be used to declare an array size. 4437 * 4438 * RESOLUTION: The result of a sequence operator is not a 4439 * constant-expression." 4440 * 4441 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec 4442 * contains language almost identical to the section 4.3.3 in the 4443 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL 4444 * versions. 4445 */ 4446 ir_constant *constant_value = 4447 rhs->constant_expression_value(mem_ctx); 4448 4449 if (!constant_value || 4450 (state->is_version(430, 300) && 4451 decl->initializer->has_sequence_subexpression())) { 4452 const char *const variable_mode = 4453 (type->qualifier.flags.q.constant) 4454 ? "const" 4455 : ((type->qualifier.flags.q.uniform) ? "uniform" : "global"); 4456 4457 /* If ARB_shading_language_420pack is enabled, initializers of 4458 * const-qualified local variables do not have to be constant 4459 * expressions. Const-qualified global variables must still be 4460 * initialized with constant expressions. 4461 */ 4462 if (!state->has_420pack() 4463 || state->current_function == NULL) { 4464 _mesa_glsl_error(& initializer_loc, state, 4465 "initializer of %s variable `%s' must be a " 4466 "constant expression", 4467 variable_mode, 4468 decl->identifier); 4469 if (var->type->is_numeric()) { 4470 /* Reduce cascading errors. */ 4471 var->constant_value = type->qualifier.flags.q.constant 4472 ? ir_constant::zero(state, var->type) : NULL; 4473 } 4474 } 4475 } else { 4476 rhs = constant_value; 4477 var->constant_value = type->qualifier.flags.q.constant 4478 ? constant_value : NULL; 4479 } 4480 } else { 4481 if (var->type->is_numeric()) { 4482 /* Reduce cascading errors. */ 4483 rhs = var->constant_value = type->qualifier.flags.q.constant 4484 ? ir_constant::zero(state, var->type) : NULL; 4485 } 4486 } 4487 } 4488 4489 if (rhs && !rhs->type->is_error()) { 4490 bool temp = var->data.read_only; 4491 if (type->qualifier.flags.q.constant) 4492 var->data.read_only = false; 4493 4494 /* Never emit code to initialize a uniform. 4495 */ 4496 const glsl_type *initializer_type; 4497 if (!type->qualifier.flags.q.uniform) { 4498 do_assignment(initializer_instructions, state, 4499 NULL, 4500 lhs, rhs, 4501 &result, true, 4502 true, 4503 type->get_location()); 4504 initializer_type = result->type; 4505 } else 4506 initializer_type = rhs->type; 4507 4508 var->constant_initializer = rhs->constant_expression_value(mem_ctx); 4509 var->data.has_initializer = true; 4510 4511 /* If the declared variable is an unsized array, it must inherrit 4512 * its full type from the initializer. A declaration such as 4513 * 4514 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0); 4515 * 4516 * becomes 4517 * 4518 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0); 4519 * 4520 * The assignment generated in the if-statement (below) will also 4521 * automatically handle this case for non-uniforms. 4522 * 4523 * If the declared variable is not an array, the types must 4524 * already match exactly. As a result, the type assignment 4525 * here can be done unconditionally. For non-uniforms the call 4526 * to do_assignment can change the type of the initializer (via 4527 * the implicit conversion rules). For uniforms the initializer 4528 * must be a constant expression, and the type of that expression 4529 * was validated above. 4530 */ 4531 var->type = initializer_type; 4532 4533 var->data.read_only = temp; 4534 } 4535 4536 return result; 4537 } 4538 4539 static void 4540 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state *state, 4541 YYLTYPE loc, ir_variable *var, 4542 unsigned num_vertices, 4543 unsigned *size, 4544 const char *var_category) 4545 { 4546 if (var->type->is_unsized_array()) { 4547 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says: 4548 * 4549 * All geometry shader input unsized array declarations will be 4550 * sized by an earlier input layout qualifier, when present, as per 4551 * the following table. 4552 * 4553 * Followed by a table mapping each allowed input layout qualifier to 4554 * the corresponding input length. 4555 * 4556 * Similarly for tessellation control shader outputs. 4557 */ 4558 if (num_vertices != 0) 4559 var->type = glsl_type::get_array_instance(var->type->fields.array, 4560 num_vertices); 4561 } else { 4562 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec 4563 * includes the following examples of compile-time errors: 4564 * 4565 * // code sequence within one shader... 4566 * in vec4 Color1[]; // size unknown 4567 * ...Color1.length()...// illegal, length() unknown 4568 * in vec4 Color2[2]; // size is 2 4569 * ...Color1.length()...// illegal, Color1 still has no size 4570 * in vec4 Color3[3]; // illegal, input sizes are inconsistent 4571 * layout(lines) in; // legal, input size is 2, matching 4572 * in vec4 Color4[3]; // illegal, contradicts layout 4573 * ... 4574 * 4575 * To detect the case illustrated by Color3, we verify that the size of 4576 * an explicitly-sized array matches the size of any previously declared 4577 * explicitly-sized array. To detect the case illustrated by Color4, we 4578 * verify that the size of an explicitly-sized array is consistent with 4579 * any previously declared input layout. 4580 */ 4581 if (num_vertices != 0 && var->type->length != num_vertices) { 4582 _mesa_glsl_error(&loc, state, 4583 "%s size contradicts previously declared layout " 4584 "(size is %u, but layout requires a size of %u)", 4585 var_category, var->type->length, num_vertices); 4586 } else if (*size != 0 && var->type->length != *size) { 4587 _mesa_glsl_error(&loc, state, 4588 "%s sizes are inconsistent (size is %u, but a " 4589 "previous declaration has size %u)", 4590 var_category, var->type->length, *size); 4591 } else { 4592 *size = var->type->length; 4593 } 4594 } 4595 } 4596 4597 static void 4598 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state *state, 4599 YYLTYPE loc, ir_variable *var) 4600 { 4601 unsigned num_vertices = 0; 4602 4603 if (state->tcs_output_vertices_specified) { 4604 if (!state->out_qualifier->vertices-> 4605 process_qualifier_constant(state, "vertices", 4606 &num_vertices, false)) { 4607 return; 4608 } 4609 4610 if (num_vertices > state->Const.MaxPatchVertices) { 4611 _mesa_glsl_error(&loc, state, "vertices (%d) exceeds " 4612 "GL_MAX_PATCH_VERTICES", num_vertices); 4613 return; 4614 } 4615 } 4616 4617 if (!var->type->is_array() && !var->data.patch) { 4618 _mesa_glsl_error(&loc, state, 4619 "tessellation control shader outputs must be arrays"); 4620 4621 /* To avoid cascading failures, short circuit the checks below. */ 4622 return; 4623 } 4624 4625 if (var->data.patch) 4626 return; 4627 4628 validate_layout_qualifier_vertex_count(state, loc, var, num_vertices, 4629 &state->tcs_output_size, 4630 "tessellation control shader output"); 4631 } 4632 4633 /** 4634 * Do additional processing necessary for tessellation control/evaluation shader 4635 * input declarations. This covers both interface block arrays and bare input 4636 * variables. 4637 */ 4638 static void 4639 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state *state, 4640 YYLTYPE loc, ir_variable *var) 4641 { 4642 if (!var->type->is_array() && !var->data.patch) { 4643 _mesa_glsl_error(&loc, state, 4644 "per-vertex tessellation shader inputs must be arrays"); 4645 /* Avoid cascading failures. */ 4646 return; 4647 } 4648 4649 if (var->data.patch) 4650 return; 4651 4652 /* The ARB_tessellation_shader spec says: 4653 * 4654 * "Declaring an array size is optional. If no size is specified, it 4655 * will be taken from the implementation-dependent maximum patch size 4656 * (gl_MaxPatchVertices). If a size is specified, it must match the 4657 * maximum patch size; otherwise, a compile or link error will occur." 4658 * 4659 * This text appears twice, once for TCS inputs, and again for TES inputs. 4660 */ 4661 if (var->type->is_unsized_array()) { 4662 var->type = glsl_type::get_array_instance(var->type->fields.array, 4663 state->Const.MaxPatchVertices); 4664 } else if (var->type->length != state->Const.MaxPatchVertices) { 4665 _mesa_glsl_error(&loc, state, 4666 "per-vertex tessellation shader input arrays must be " 4667 "sized to gl_MaxPatchVertices (%d).", 4668 state->Const.MaxPatchVertices); 4669 } 4670 } 4671 4672 4673 /** 4674 * Do additional processing necessary for geometry shader input declarations 4675 * (this covers both interface blocks arrays and bare input variables). 4676 */ 4677 static void 4678 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state *state, 4679 YYLTYPE loc, ir_variable *var) 4680 { 4681 unsigned num_vertices = 0; 4682 4683 if (state->gs_input_prim_type_specified) { 4684 num_vertices = vertices_per_prim(state->in_qualifier->prim_type); 4685 } 4686 4687 /* Geometry shader input variables must be arrays. Caller should have 4688 * reported an error for this. 4689 */ 4690 if (!var->type->is_array()) { 4691 assert(state->error); 4692 4693 /* To avoid cascading failures, short circuit the checks below. */ 4694 return; 4695 } 4696 4697 validate_layout_qualifier_vertex_count(state, loc, var, num_vertices, 4698 &state->gs_input_size, 4699 "geometry shader input"); 4700 } 4701 4702 static void 4703 validate_identifier(const char *identifier, YYLTYPE loc, 4704 struct _mesa_glsl_parse_state *state) 4705 { 4706 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec, 4707 * 4708 * "Identifiers starting with "gl_" are reserved for use by 4709 * OpenGL, and may not be declared in a shader as either a 4710 * variable or a function." 4711 */ 4712 if (is_gl_identifier(identifier)) { 4713 _mesa_glsl_error(&loc, state, 4714 "identifier `%s' uses reserved `gl_' prefix", 4715 identifier); 4716 } else if (strstr(identifier, "__")) { 4717 /* From page 14 (page 20 of the PDF) of the GLSL 1.10 4718 * spec: 4719 * 4720 * "In addition, all identifiers containing two 4721 * consecutive underscores (__) are reserved as 4722 * possible future keywords." 4723 * 4724 * The intention is that names containing __ are reserved for internal 4725 * use by the implementation, and names prefixed with GL_ are reserved 4726 * for use by Khronos. Names simply containing __ are dangerous to use, 4727 * but should be allowed. 4728 * 4729 * A future version of the GLSL specification will clarify this. 4730 */ 4731 _mesa_glsl_warning(&loc, state, 4732 "identifier `%s' uses reserved `__' string", 4733 identifier); 4734 } 4735 } 4736 4737 ir_rvalue * 4738 ast_declarator_list::hir(exec_list *instructions, 4739 struct _mesa_glsl_parse_state *state) 4740 { 4741 void *ctx = state; 4742 const struct glsl_type *decl_type; 4743 const char *type_name = NULL; 4744 ir_rvalue *result = NULL; 4745 YYLTYPE loc = this->get_location(); 4746 4747 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec: 4748 * 4749 * "To ensure that a particular output variable is invariant, it is 4750 * necessary to use the invariant qualifier. It can either be used to 4751 * qualify a previously declared variable as being invariant 4752 * 4753 * invariant gl_Position; // make existing gl_Position be invariant" 4754 * 4755 * In these cases the parser will set the 'invariant' flag in the declarator 4756 * list, and the type will be NULL. 4757 */ 4758 if (this->invariant) { 4759 assert(this->type == NULL); 4760 4761 if (state->current_function != NULL) { 4762 _mesa_glsl_error(& loc, state, 4763 "all uses of `invariant' keyword must be at global " 4764 "scope"); 4765 } 4766 4767 foreach_list_typed (ast_declaration, decl, link, &this->declarations) { 4768 assert(decl->array_specifier == NULL); 4769 assert(decl->initializer == NULL); 4770 4771 ir_variable *const earlier = 4772 state->symbols->get_variable(decl->identifier); 4773 if (earlier == NULL) { 4774 _mesa_glsl_error(& loc, state, 4775 "undeclared variable `%s' cannot be marked " 4776 "invariant", decl->identifier); 4777 } else if (!is_allowed_invariant(earlier, state)) { 4778 _mesa_glsl_error(&loc, state, 4779 "`%s' cannot be marked invariant; interfaces between " 4780 "shader stages only.", decl->identifier); 4781 } else if (earlier->data.used) { 4782 _mesa_glsl_error(& loc, state, 4783 "variable `%s' may not be redeclared " 4784 "`invariant' after being used", 4785 earlier->name); 4786 } else { 4787 earlier->data.invariant = true; 4788 } 4789 } 4790 4791 /* Invariant redeclarations do not have r-values. 4792 */ 4793 return NULL; 4794 } 4795 4796 if (this->precise) { 4797 assert(this->type == NULL); 4798 4799 foreach_list_typed (ast_declaration, decl, link, &this->declarations) { 4800 assert(decl->array_specifier == NULL); 4801 assert(decl->initializer == NULL); 4802 4803 ir_variable *const earlier = 4804 state->symbols->get_variable(decl->identifier); 4805 if (earlier == NULL) { 4806 _mesa_glsl_error(& loc, state, 4807 "undeclared variable `%s' cannot be marked " 4808 "precise", decl->identifier); 4809 } else if (state->current_function != NULL && 4810 !state->symbols->name_declared_this_scope(decl->identifier)) { 4811 /* Note: we have to check if we're in a function, since 4812 * builtins are treated as having come from another scope. 4813 */ 4814 _mesa_glsl_error(& loc, state, 4815 "variable `%s' from an outer scope may not be " 4816 "redeclared `precise' in this scope", 4817 earlier->name); 4818 } else if (earlier->data.used) { 4819 _mesa_glsl_error(& loc, state, 4820 "variable `%s' may not be redeclared " 4821 "`precise' after being used", 4822 earlier->name); 4823 } else { 4824 earlier->data.precise = true; 4825 } 4826 } 4827 4828 /* Precise redeclarations do not have r-values either. */ 4829 return NULL; 4830 } 4831 4832 assert(this->type != NULL); 4833 assert(!this->invariant); 4834 assert(!this->precise); 4835 4836 /* The type specifier may contain a structure definition. Process that 4837 * before any of the variable declarations. 4838 */ 4839 (void) this->type->specifier->hir(instructions, state); 4840 4841 decl_type = this->type->glsl_type(& type_name, state); 4842 4843 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec: 4844 * "Buffer variables may only be declared inside interface blocks 4845 * (section 4.3.9 Interface Blocks), which are then referred to as 4846 * shader storage blocks. It is a compile-time error to declare buffer 4847 * variables at global scope (outside a block)." 4848 */ 4849 if (type->qualifier.flags.q.buffer && !decl_type->is_interface()) { 4850 _mesa_glsl_error(&loc, state, 4851 "buffer variables cannot be declared outside " 4852 "interface blocks"); 4853 } 4854 4855 /* An offset-qualified atomic counter declaration sets the default 4856 * offset for the next declaration within the same atomic counter 4857 * buffer. 4858 */ 4859 if (decl_type && decl_type->contains_atomic()) { 4860 if (type->qualifier.flags.q.explicit_binding && 4861 type->qualifier.flags.q.explicit_offset) { 4862 unsigned qual_binding; 4863 unsigned qual_offset; 4864 if (process_qualifier_constant(state, &loc, "binding", 4865 type->qualifier.binding, 4866 &qual_binding) 4867 && process_qualifier_constant(state, &loc, "offset", 4868 type->qualifier.offset, 4869 &qual_offset)) { 4870 state->atomic_counter_offsets[qual_binding] = qual_offset; 4871 } 4872 } 4873 4874 ast_type_qualifier allowed_atomic_qual_mask; 4875 allowed_atomic_qual_mask.flags.i = 0; 4876 allowed_atomic_qual_mask.flags.q.explicit_binding = 1; 4877 allowed_atomic_qual_mask.flags.q.explicit_offset = 1; 4878 allowed_atomic_qual_mask.flags.q.uniform = 1; 4879 4880 type->qualifier.validate_flags(&loc, state, allowed_atomic_qual_mask, 4881 "invalid layout qualifier for", 4882 "atomic_uint"); 4883 } 4884 4885 if (this->declarations.is_empty()) { 4886 /* If there is no structure involved in the program text, there are two 4887 * possible scenarios: 4888 * 4889 * - The program text contained something like 'vec4;'. This is an 4890 * empty declaration. It is valid but weird. Emit a warning. 4891 * 4892 * - The program text contained something like 'S;' and 'S' is not the 4893 * name of a known structure type. This is both invalid and weird. 4894 * Emit an error. 4895 * 4896 * - The program text contained something like 'mediump float;' 4897 * when the programmer probably meant 'precision mediump 4898 * float;' Emit a warning with a description of what they 4899 * probably meant to do. 4900 * 4901 * Note that if decl_type is NULL and there is a structure involved, 4902 * there must have been some sort of error with the structure. In this 4903 * case we assume that an error was already generated on this line of 4904 * code for the structure. There is no need to generate an additional, 4905 * confusing error. 4906 */ 4907 assert(this->type->specifier->structure == NULL || decl_type != NULL 4908 || state->error); 4909 4910 if (decl_type == NULL) { 4911 _mesa_glsl_error(&loc, state, 4912 "invalid type `%s' in empty declaration", 4913 type_name); 4914 } else { 4915 if (decl_type->is_array()) { 4916 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2 4917 * spec: 4918 * 4919 * "... any declaration that leaves the size undefined is 4920 * disallowed as this would add complexity and there are no 4921 * use-cases." 4922 */ 4923 if (state->es_shader && decl_type->is_unsized_array()) { 4924 _mesa_glsl_error(&loc, state, "array size must be explicitly " 4925 "or implicitly defined"); 4926 } 4927 4928 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec: 4929 * 4930 * "The combinations of types and qualifiers that cause 4931 * compile-time or link-time errors are the same whether or not 4932 * the declaration is empty." 4933 */ 4934 validate_array_dimensions(decl_type, state, &loc); 4935 } 4936 4937 if (decl_type->is_atomic_uint()) { 4938 /* Empty atomic counter declarations are allowed and useful 4939 * to set the default offset qualifier. 4940 */ 4941 return NULL; 4942 } else if (this->type->qualifier.precision != ast_precision_none) { 4943 if (this->type->specifier->structure != NULL) { 4944 _mesa_glsl_error(&loc, state, 4945 "precision qualifiers can't be applied " 4946 "to structures"); 4947 } else { 4948 static const char *const precision_names[] = { 4949 "highp", 4950 "highp", 4951 "mediump", 4952 "lowp" 4953 }; 4954 4955 _mesa_glsl_warning(&loc, state, 4956 "empty declaration with precision " 4957 "qualifier, to set the default precision, " 4958 "use `precision %s %s;'", 4959 precision_names[this->type-> 4960 qualifier.precision], 4961 type_name); 4962 } 4963 } else if (this->type->specifier->structure == NULL) { 4964 _mesa_glsl_warning(&loc, state, "empty declaration"); 4965 } 4966 } 4967 } 4968 4969 foreach_list_typed (ast_declaration, decl, link, &this->declarations) { 4970 const struct glsl_type *var_type; 4971 ir_variable *var; 4972 const char *identifier = decl->identifier; 4973 /* FINISHME: Emit a warning if a variable declaration shadows a 4974 * FINISHME: declaration at a higher scope. 4975 */ 4976 4977 if ((decl_type == NULL) || decl_type->is_void()) { 4978 if (type_name != NULL) { 4979 _mesa_glsl_error(& loc, state, 4980 "invalid type `%s' in declaration of `%s'", 4981 type_name, decl->identifier); 4982 } else { 4983 _mesa_glsl_error(& loc, state, 4984 "invalid type in declaration of `%s'", 4985 decl->identifier); 4986 } 4987 continue; 4988 } 4989 4990 if (this->type->qualifier.is_subroutine_decl()) { 4991 const glsl_type *t; 4992 const char *name; 4993 4994 t = state->symbols->get_type(this->type->specifier->type_name); 4995 if (!t) 4996 _mesa_glsl_error(& loc, state, 4997 "invalid type in declaration of `%s'", 4998 decl->identifier); 4999 name = ralloc_asprintf(ctx, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state->stage), decl->identifier); 5000 5001 identifier = name; 5002 5003 } 5004 var_type = process_array_type(&loc, decl_type, decl->array_specifier, 5005 state); 5006 5007 var = new(ctx) ir_variable(var_type, identifier, ir_var_auto); 5008 5009 /* The 'varying in' and 'varying out' qualifiers can only be used with 5010 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support 5011 * yet. 5012 */ 5013 if (this->type->qualifier.flags.q.varying) { 5014 if (this->type->qualifier.flags.q.in) { 5015 _mesa_glsl_error(& loc, state, 5016 "`varying in' qualifier in declaration of " 5017 "`%s' only valid for geometry shaders using " 5018 "ARB_geometry_shader4 or EXT_geometry_shader4", 5019 decl->identifier); 5020 } else if (this->type->qualifier.flags.q.out) { 5021 _mesa_glsl_error(& loc, state, 5022 "`varying out' qualifier in declaration of " 5023 "`%s' only valid for geometry shaders using " 5024 "ARB_geometry_shader4 or EXT_geometry_shader4", 5025 decl->identifier); 5026 } 5027 } 5028 5029 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification; 5030 * 5031 * "Global variables can only use the qualifiers const, 5032 * attribute, uniform, or varying. Only one may be 5033 * specified. 5034 * 5035 * Local variables can only use the qualifier const." 5036 * 5037 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by 5038 * any extension that adds the 'layout' keyword. 5039 */ 5040 if (!state->is_version(130, 300) 5041 && !state->has_explicit_attrib_location() 5042 && !state->has_separate_shader_objects() 5043 && !state->ARB_fragment_coord_conventions_enable) { 5044 if (this->type->qualifier.flags.q.out) { 5045 _mesa_glsl_error(& loc, state, 5046 "`out' qualifier in declaration of `%s' " 5047 "only valid for function parameters in %s", 5048 decl->identifier, state->get_version_string()); 5049 } 5050 if (this->type->qualifier.flags.q.in) { 5051 _mesa_glsl_error(& loc, state, 5052 "`in' qualifier in declaration of `%s' " 5053 "only valid for function parameters in %s", 5054 decl->identifier, state->get_version_string()); 5055 } 5056 /* FINISHME: Test for other invalid qualifiers. */ 5057 } 5058 5059 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, 5060 & loc, false); 5061 apply_layout_qualifier_to_variable(&this->type->qualifier, var, state, 5062 &loc); 5063 5064 if ((var->data.mode == ir_var_auto || var->data.mode == ir_var_temporary) 5065 && (var->type->is_numeric() || var->type->is_boolean()) 5066 && state->zero_init) { 5067 const ir_constant_data data = { { 0 } }; 5068 var->data.has_initializer = true; 5069 var->constant_initializer = new(var) ir_constant(var->type, &data); 5070 } 5071 5072 if (this->type->qualifier.flags.q.invariant) { 5073 if (!is_allowed_invariant(var, state)) { 5074 _mesa_glsl_error(&loc, state, 5075 "`%s' cannot be marked invariant; interfaces between " 5076 "shader stages only", var->name); 5077 } 5078 } 5079 5080 if (state->current_function != NULL) { 5081 const char *mode = NULL; 5082 const char *extra = ""; 5083 5084 /* There is no need to check for 'inout' here because the parser will 5085 * only allow that in function parameter lists. 5086 */ 5087 if (this->type->qualifier.flags.q.attribute) { 5088 mode = "attribute"; 5089 } else if (this->type->qualifier.is_subroutine_decl()) { 5090 mode = "subroutine uniform"; 5091 } else if (this->type->qualifier.flags.q.uniform) { 5092 mode = "uniform"; 5093 } else if (this->type->qualifier.flags.q.varying) { 5094 mode = "varying"; 5095 } else if (this->type->qualifier.flags.q.in) { 5096 mode = "in"; 5097 extra = " or in function parameter list"; 5098 } else if (this->type->qualifier.flags.q.out) { 5099 mode = "out"; 5100 extra = " or in function parameter list"; 5101 } 5102 5103 if (mode) { 5104 _mesa_glsl_error(& loc, state, 5105 "%s variable `%s' must be declared at " 5106 "global scope%s", 5107 mode, var->name, extra); 5108 } 5109 } else if (var->data.mode == ir_var_shader_in) { 5110 var->data.read_only = true; 5111 5112 if (state->stage == MESA_SHADER_VERTEX) { 5113 bool error_emitted = false; 5114 5115 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec: 5116 * 5117 * "Vertex shader inputs can only be float, floating-point 5118 * vectors, matrices, signed and unsigned integers and integer 5119 * vectors. Vertex shader inputs can also form arrays of these 5120 * types, but not structures." 5121 * 5122 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec: 5123 * 5124 * "Vertex shader inputs can only be float, floating-point 5125 * vectors, matrices, signed and unsigned integers and integer 5126 * vectors. They cannot be arrays or structures." 5127 * 5128 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec: 5129 * 5130 * "The attribute qualifier can be used only with float, 5131 * floating-point vectors, and matrices. Attribute variables 5132 * cannot be declared as arrays or structures." 5133 * 5134 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec: 5135 * 5136 * "Vertex shader inputs can only be float, floating-point 5137 * vectors, matrices, signed and unsigned integers and integer 5138 * vectors. Vertex shader inputs cannot be arrays or 5139 * structures." 5140 * 5141 * From section 4.3.4 of the ARB_bindless_texture spec: 5142 * 5143 * "(modify third paragraph of the section to allow sampler and 5144 * image types) ... Vertex shader inputs can only be float, 5145 * single-precision floating-point scalars, single-precision 5146 * floating-point vectors, matrices, signed and unsigned 5147 * integers and integer vectors, sampler and image types." 5148 */ 5149 const glsl_type *check_type = var->type->without_array(); 5150 5151 switch (check_type->base_type) { 5152 case GLSL_TYPE_FLOAT: 5153 break; 5154 case GLSL_TYPE_UINT64: 5155 case GLSL_TYPE_INT64: 5156 break; 5157 case GLSL_TYPE_UINT: 5158 case GLSL_TYPE_INT: 5159 if (state->is_version(120, 300)) 5160 break; 5161 case GLSL_TYPE_DOUBLE: 5162 if (check_type->is_double() && (state->is_version(410, 0) || state->ARB_vertex_attrib_64bit_enable)) 5163 break; 5164 case GLSL_TYPE_SAMPLER: 5165 if (check_type->is_sampler() && state->has_bindless()) 5166 break; 5167 case GLSL_TYPE_IMAGE: 5168 if (check_type->is_image() && state->has_bindless()) 5169 break; 5170 /* FALLTHROUGH */ 5171 default: 5172 _mesa_glsl_error(& loc, state, 5173 "vertex shader input / attribute cannot have " 5174 "type %s`%s'", 5175 var->type->is_array() ? "array of " : "", 5176 check_type->name); 5177 error_emitted = true; 5178 } 5179 5180 if (!error_emitted && var->type->is_array() && 5181 !state->check_version(150, 0, &loc, 5182 "vertex shader input / attribute " 5183 "cannot have array type")) { 5184 error_emitted = true; 5185 } 5186 } else if (state->stage == MESA_SHADER_GEOMETRY) { 5187 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec: 5188 * 5189 * Geometry shader input variables get the per-vertex values 5190 * written out by vertex shader output variables of the same 5191 * names. Since a geometry shader operates on a set of 5192 * vertices, each input varying variable (or input block, see 5193 * interface blocks below) needs to be declared as an array. 5194 */ 5195 if (!var->type->is_array()) { 5196 _mesa_glsl_error(&loc, state, 5197 "geometry shader inputs must be arrays"); 5198 } 5199 5200 handle_geometry_shader_input_decl(state, loc, var); 5201 } else if (state->stage == MESA_SHADER_FRAGMENT) { 5202 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec: 5203 * 5204 * It is a compile-time error to declare a fragment shader 5205 * input with, or that contains, any of the following types: 5206 * 5207 * * A boolean type 5208 * * An opaque type 5209 * * An array of arrays 5210 * * An array of structures 5211 * * A structure containing an array 5212 * * A structure containing a structure 5213 */ 5214 if (state->es_shader) { 5215 const glsl_type *check_type = var->type->without_array(); 5216 if (check_type->is_boolean() || 5217 check_type->contains_opaque()) { 5218 _mesa_glsl_error(&loc, state, 5219 "fragment shader input cannot have type %s", 5220 check_type->name); 5221 } 5222 if (var->type->is_array() && 5223 var->type->fields.array->is_array()) { 5224 _mesa_glsl_error(&loc, state, 5225 "%s shader output " 5226 "cannot have an array of arrays", 5227 _mesa_shader_stage_to_string(state->stage)); 5228 } 5229 if (var->type->is_array() && 5230 var->type->fields.array->is_record()) { 5231 _mesa_glsl_error(&loc, state, 5232 "fragment shader input " 5233 "cannot have an array of structs"); 5234 } 5235 if (var->type->is_record()) { 5236 for (unsigned i = 0; i < var->type->length; i++) { 5237 if (var->type->fields.structure[i].type->is_array() || 5238 var->type->fields.structure[i].type->is_record()) 5239 _mesa_glsl_error(&loc, state, 5240 "fragment shader input cannot have " 5241 "a struct that contains an " 5242 "array or struct"); 5243 } 5244 } 5245 } 5246 } else if (state->stage == MESA_SHADER_TESS_CTRL || 5247 state->stage == MESA_SHADER_TESS_EVAL) { 5248 handle_tess_shader_input_decl(state, loc, var); 5249 } 5250 } else if (var->data.mode == ir_var_shader_out) { 5251 const glsl_type *check_type = var->type->without_array(); 5252 5253 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec: 5254 * 5255 * It is a compile-time error to declare a fragment shader output 5256 * that contains any of the following: 5257 * 5258 * * A Boolean type (bool, bvec2 ...) 5259 * * A double-precision scalar or vector (double, dvec2 ...) 5260 * * An opaque type 5261 * * Any matrix type 5262 * * A structure 5263 */ 5264 if (state->stage == MESA_SHADER_FRAGMENT) { 5265 if (check_type->is_record() || check_type->is_matrix()) 5266 _mesa_glsl_error(&loc, state, 5267 "fragment shader output " 5268 "cannot have struct or matrix type"); 5269 switch (check_type->base_type) { 5270 case GLSL_TYPE_UINT: 5271 case GLSL_TYPE_INT: 5272 case GLSL_TYPE_FLOAT: 5273 break; 5274 default: 5275 _mesa_glsl_error(&loc, state, 5276 "fragment shader output cannot have " 5277 "type %s", check_type->name); 5278 } 5279 } 5280 5281 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec: 5282 * 5283 * It is a compile-time error to declare a vertex shader output 5284 * with, or that contains, any of the following types: 5285 * 5286 * * A boolean type 5287 * * An opaque type 5288 * * An array of arrays 5289 * * An array of structures 5290 * * A structure containing an array 5291 * * A structure containing a structure 5292 * 5293 * It is a compile-time error to declare a fragment shader output 5294 * with, or that contains, any of the following types: 5295 * 5296 * * A boolean type 5297 * * An opaque type 5298 * * A matrix 5299 * * A structure 5300 * * An array of array 5301 * 5302 * ES 3.20 updates this to apply to tessellation and geometry shaders 5303 * as well. Because there are per-vertex arrays in the new stages, 5304 * it strikes the "array of..." rules and replaces them with these: 5305 * 5306 * * For per-vertex-arrayed variables (applies to tessellation 5307 * control, tessellation evaluation and geometry shaders): 5308 * 5309 * * Per-vertex-arrayed arrays of arrays 5310 * * Per-vertex-arrayed arrays of structures 5311 * 5312 * * For non-per-vertex-arrayed variables: 5313 * 5314 * * An array of arrays 5315 * * An array of structures 5316 * 5317 * which basically says to unwrap the per-vertex aspect and apply 5318 * the old rules. 5319 */ 5320 if (state->es_shader) { 5321 if (var->type->is_array() && 5322 var->type->fields.array->is_array()) { 5323 _mesa_glsl_error(&loc, state, 5324 "%s shader output " 5325 "cannot have an array of arrays", 5326 _mesa_shader_stage_to_string(state->stage)); 5327 } 5328 if (state->stage <= MESA_SHADER_GEOMETRY) { 5329 const glsl_type *type = var->type; 5330 5331 if (state->stage == MESA_SHADER_TESS_CTRL && 5332 !var->data.patch && var->type->is_array()) { 5333 type = var->type->fields.array; 5334 } 5335 5336 if (type->is_array() && type->fields.array->is_record()) { 5337 _mesa_glsl_error(&loc, state, 5338 "%s shader output cannot have " 5339 "an array of structs", 5340 _mesa_shader_stage_to_string(state->stage)); 5341 } 5342 if (type->is_record()) { 5343 for (unsigned i = 0; i < type->length; i++) { 5344 if (type->fields.structure[i].type->is_array() || 5345 type->fields.structure[i].type->is_record()) 5346 _mesa_glsl_error(&loc, state, 5347 "%s shader output cannot have a " 5348 "struct that contains an " 5349 "array or struct", 5350 _mesa_shader_stage_to_string(state->stage)); 5351 } 5352 } 5353 } 5354 } 5355 5356 if (state->stage == MESA_SHADER_TESS_CTRL) { 5357 handle_tess_ctrl_shader_output_decl(state, loc, var); 5358 } 5359 } else if (var->type->contains_subroutine()) { 5360 /* declare subroutine uniforms as hidden */ 5361 var->data.how_declared = ir_var_hidden; 5362 } 5363 5364 /* From section 4.3.4 of the GLSL 4.00 spec: 5365 * "Input variables may not be declared using the patch in qualifier 5366 * in tessellation control or geometry shaders." 5367 * 5368 * From section 4.3.6 of the GLSL 4.00 spec: 5369 * "It is an error to use patch out in a vertex, tessellation 5370 * evaluation, or geometry shader." 5371 * 5372 * This doesn't explicitly forbid using them in a fragment shader, but 5373 * that's probably just an oversight. 5374 */ 5375 if (state->stage != MESA_SHADER_TESS_EVAL 5376 && this->type->qualifier.flags.q.patch 5377 && this->type->qualifier.flags.q.in) { 5378 5379 _mesa_glsl_error(&loc, state, "'patch in' can only be used in a " 5380 "tessellation evaluation shader"); 5381 } 5382 5383 if (state->stage != MESA_SHADER_TESS_CTRL 5384 && this->type->qualifier.flags.q.patch 5385 && this->type->qualifier.flags.q.out) { 5386 5387 _mesa_glsl_error(&loc, state, "'patch out' can only be used in a " 5388 "tessellation control shader"); 5389 } 5390 5391 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30. 5392 */ 5393 if (this->type->qualifier.precision != ast_precision_none) { 5394 state->check_precision_qualifiers_allowed(&loc); 5395 } 5396 5397 if (this->type->qualifier.precision != ast_precision_none && 5398 !precision_qualifier_allowed(var->type)) { 5399 _mesa_glsl_error(&loc, state, 5400 "precision qualifiers apply only to floating point" 5401 ", integer and opaque types"); 5402 } 5403 5404 /* From section 4.1.7 of the GLSL 4.40 spec: 5405 * 5406 * "[Opaque types] can only be declared as function 5407 * parameters or uniform-qualified variables." 5408 * 5409 * From section 4.1.7 of the ARB_bindless_texture spec: 5410 * 5411 * "Samplers may be declared as shader inputs and outputs, as uniform 5412 * variables, as temporary variables, and as function parameters." 5413 * 5414 * From section 4.1.X of the ARB_bindless_texture spec: 5415 * 5416 * "Images may be declared as shader inputs and outputs, as uniform 5417 * variables, as temporary variables, and as function parameters." 5418 */ 5419 if (!this->type->qualifier.flags.q.uniform && 5420 (var_type->contains_atomic() || 5421 (!state->has_bindless() && var_type->contains_opaque()))) { 5422 _mesa_glsl_error(&loc, state, 5423 "%s variables must be declared uniform", 5424 state->has_bindless() ? "atomic" : "opaque"); 5425 } 5426 5427 /* Process the initializer and add its instructions to a temporary 5428 * list. This list will be added to the instruction stream (below) after 5429 * the declaration is added. This is done because in some cases (such as 5430 * redeclarations) the declaration may not actually be added to the 5431 * instruction stream. 5432 */ 5433 exec_list initializer_instructions; 5434 5435 /* Examine var name here since var may get deleted in the next call */ 5436 bool var_is_gl_id = is_gl_identifier(var->name); 5437 5438 bool is_redeclaration; 5439 var = get_variable_being_redeclared(&var, decl->get_location(), state, 5440 false /* allow_all_redeclarations */, 5441 &is_redeclaration); 5442 if (is_redeclaration) { 5443 if (var_is_gl_id && 5444 var->data.how_declared == ir_var_declared_in_block) { 5445 _mesa_glsl_error(&loc, state, 5446 "`%s' has already been redeclared using " 5447 "gl_PerVertex", var->name); 5448 } 5449 var->data.how_declared = ir_var_declared_normally; 5450 } 5451 5452 if (decl->initializer != NULL) { 5453 result = process_initializer(var, 5454 decl, this->type, 5455 &initializer_instructions, state); 5456 } else { 5457 validate_array_dimensions(var_type, state, &loc); 5458 } 5459 5460 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec: 5461 * 5462 * "It is an error to write to a const variable outside of 5463 * its declaration, so they must be initialized when 5464 * declared." 5465 */ 5466 if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) { 5467 _mesa_glsl_error(& loc, state, 5468 "const declaration of `%s' must be initialized", 5469 decl->identifier); 5470 } 5471 5472 if (state->es_shader) { 5473 const glsl_type *const t = var->type; 5474 5475 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs. 5476 * 5477 * The GL_OES_tessellation_shader spec says about inputs: 5478 * 5479 * "Declaring an array size is optional. If no size is specified, 5480 * it will be taken from the implementation-dependent maximum 5481 * patch size (gl_MaxPatchVertices)." 5482 * 5483 * and about TCS outputs: 5484 * 5485 * "If no size is specified, it will be taken from output patch 5486 * size declared in the shader." 5487 * 5488 * The GL_OES_geometry_shader spec says: 5489 * 5490 * "All geometry shader input unsized array declarations will be 5491 * sized by an earlier input primitive layout qualifier, when 5492 * present, as per the following table." 5493 */ 5494 const bool implicitly_sized = 5495 (var->data.mode == ir_var_shader_in && 5496 state->stage >= MESA_SHADER_TESS_CTRL && 5497 state->stage <= MESA_SHADER_GEOMETRY) || 5498 (var->data.mode == ir_var_shader_out && 5499 state->stage == MESA_SHADER_TESS_CTRL); 5500 5501 if (t->is_unsized_array() && !implicitly_sized) 5502 /* Section 10.17 of the GLSL ES 1.00 specification states that 5503 * unsized array declarations have been removed from the language. 5504 * Arrays that are sized using an initializer are still explicitly 5505 * sized. However, GLSL ES 1.00 does not allow array 5506 * initializers. That is only allowed in GLSL ES 3.00. 5507 * 5508 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says: 5509 * 5510 * "An array type can also be formed without specifying a size 5511 * if the definition includes an initializer: 5512 * 5513 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2 5514 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3 5515 * 5516 * float a[5]; 5517 * float b[] = a;" 5518 */ 5519 _mesa_glsl_error(& loc, state, 5520 "unsized array declarations are not allowed in " 5521 "GLSL ES"); 5522 } 5523 5524 /* Section 4.4.6.1 Atomic Counter Layout Qualifiers of the GLSL 4.60 spec: 5525 * 5526 * "It is a compile-time error to declare an unsized array of 5527 * atomic_uint" 5528 */ 5529 if (var->type->is_unsized_array() && 5530 var->type->without_array()->base_type == GLSL_TYPE_ATOMIC_UINT) { 5531 _mesa_glsl_error(& loc, state, 5532 "Unsized array of atomic_uint is not allowed"); 5533 } 5534 5535 /* If the declaration is not a redeclaration, there are a few additional 5536 * semantic checks that must be applied. In addition, variable that was 5537 * created for the declaration should be added to the IR stream. 5538 */ 5539 if (!is_redeclaration) { 5540 validate_identifier(decl->identifier, loc, state); 5541 5542 /* Add the variable to the symbol table. Note that the initializer's 5543 * IR was already processed earlier (though it hasn't been emitted 5544 * yet), without the variable in scope. 5545 * 5546 * This differs from most C-like languages, but it follows the GLSL 5547 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50 5548 * spec: 5549 * 5550 * "Within a declaration, the scope of a name starts immediately 5551 * after the initializer if present or immediately after the name 5552 * being declared if not." 5553 */ 5554 if (!state->symbols->add_variable(var)) { 5555 YYLTYPE loc = this->get_location(); 5556 _mesa_glsl_error(&loc, state, "name `%s' already taken in the " 5557 "current scope", decl->identifier); 5558 continue; 5559 } 5560 5561 /* Push the variable declaration to the top. It means that all the 5562 * variable declarations will appear in a funny last-to-first order, 5563 * but otherwise we run into trouble if a function is prototyped, a 5564 * global var is decled, then the function is defined with usage of 5565 * the global var. See glslparsertest's CorrectModule.frag. 5566 */ 5567 instructions->push_head(var); 5568 } 5569 5570 instructions->append_list(&initializer_instructions); 5571 } 5572 5573 5574 /* Generally, variable declarations do not have r-values. However, 5575 * one is used for the declaration in 5576 * 5577 * while (bool b = some_condition()) { 5578 * ... 5579 * } 5580 * 5581 * so we return the rvalue from the last seen declaration here. 5582 */ 5583 return result; 5584 } 5585 5586 5587 ir_rvalue * 5588 ast_parameter_declarator::hir(exec_list *instructions, 5589 struct _mesa_glsl_parse_state *state) 5590 { 5591 void *ctx = state; 5592 const struct glsl_type *type; 5593 const char *name = NULL; 5594 YYLTYPE loc = this->get_location(); 5595 5596 type = this->type->glsl_type(& name, state); 5597 5598 if (type == NULL) { 5599 if (name != NULL) { 5600 _mesa_glsl_error(& loc, state, 5601 "invalid type `%s' in declaration of `%s'", 5602 name, this->identifier); 5603 } else { 5604 _mesa_glsl_error(& loc, state, 5605 "invalid type in declaration of `%s'", 5606 this->identifier); 5607 } 5608 5609 type = glsl_type::error_type; 5610 } 5611 5612 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec: 5613 * 5614 * "Functions that accept no input arguments need not use void in the 5615 * argument list because prototypes (or definitions) are required and 5616 * therefore there is no ambiguity when an empty argument list "( )" is 5617 * declared. The idiom "(void)" as a parameter list is provided for 5618 * convenience." 5619 * 5620 * Placing this check here prevents a void parameter being set up 5621 * for a function, which avoids tripping up checks for main taking 5622 * parameters and lookups of an unnamed symbol. 5623 */ 5624 if (type->is_void()) { 5625 if (this->identifier != NULL) 5626 _mesa_glsl_error(& loc, state, 5627 "named parameter cannot have type `void'"); 5628 5629 is_void = true; 5630 return NULL; 5631 } 5632 5633 if (formal_parameter && (this->identifier == NULL)) { 5634 _mesa_glsl_error(& loc, state, "formal parameter lacks a name"); 5635 return NULL; 5636 } 5637 5638 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...) 5639 * call already handled the "vec4[..] foo" case. 5640 */ 5641 type = process_array_type(&loc, type, this->array_specifier, state); 5642 5643 if (!type->is_error() && type->is_unsized_array()) { 5644 _mesa_glsl_error(&loc, state, "arrays passed as parameters must have " 5645 "a declared size"); 5646 type = glsl_type::error_type; 5647 } 5648 5649 is_void = false; 5650 ir_variable *var = new(ctx) 5651 ir_variable(type, this->identifier, ir_var_function_in); 5652 5653 /* Apply any specified qualifiers to the parameter declaration. Note that 5654 * for function parameters the default mode is 'in'. 5655 */ 5656 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc, 5657 true); 5658 5659 /* From section 4.1.7 of the GLSL 4.40 spec: 5660 * 5661 * "Opaque variables cannot be treated as l-values; hence cannot 5662 * be used as out or inout function parameters, nor can they be 5663 * assigned into." 5664 * 5665 * From section 4.1.7 of the ARB_bindless_texture spec: 5666 * 5667 * "Samplers can be used as l-values, so can be assigned into and used 5668 * as "out" and "inout" function parameters." 5669 * 5670 * From section 4.1.X of the ARB_bindless_texture spec: 5671 * 5672 * "Images can be used as l-values, so can be assigned into and used as 5673 * "out" and "inout" function parameters." 5674 */ 5675 if ((var->data.mode == ir_var_function_inout || var->data.mode == ir_var_function_out) 5676 && (type->contains_atomic() || 5677 (!state->has_bindless() && type->contains_opaque()))) { 5678 _mesa_glsl_error(&loc, state, "out and inout parameters cannot " 5679 "contain %s variables", 5680 state->has_bindless() ? "atomic" : "opaque"); 5681 type = glsl_type::error_type; 5682 } 5683 5684 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec: 5685 * 5686 * "When calling a function, expressions that do not evaluate to 5687 * l-values cannot be passed to parameters declared as out or inout." 5688 * 5689 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec: 5690 * 5691 * "Other binary or unary expressions, non-dereferenced arrays, 5692 * function names, swizzles with repeated fields, and constants 5693 * cannot be l-values." 5694 * 5695 * So for GLSL 1.10, passing an array as an out or inout parameter is not 5696 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES. 5697 */ 5698 if ((var->data.mode == ir_var_function_inout || var->data.mode == ir_var_function_out) 5699 && type->is_array() 5700 && !state->check_version(120, 100, &loc, 5701 "arrays cannot be out or inout parameters")) { 5702 type = glsl_type::error_type; 5703 } 5704 5705 instructions->push_tail(var); 5706 5707 /* Parameter declarations do not have r-values. 5708 */ 5709 return NULL; 5710 } 5711 5712 5713 void 5714 ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters, 5715 bool formal, 5716 exec_list *ir_parameters, 5717 _mesa_glsl_parse_state *state) 5718 { 5719 ast_parameter_declarator *void_param = NULL; 5720 unsigned count = 0; 5721 5722 foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) { 5723 param->formal_parameter = formal; 5724 param->hir(ir_parameters, state); 5725 5726 if (param->is_void) 5727 void_param = param; 5728 5729 count++; 5730 } 5731 5732 if ((void_param != NULL) && (count > 1)) { 5733 YYLTYPE loc = void_param->get_location(); 5734 5735 _mesa_glsl_error(& loc, state, 5736 "`void' parameter must be only parameter"); 5737 } 5738 } 5739 5740 5741 void 5742 emit_function(_mesa_glsl_parse_state *state, ir_function *f) 5743 { 5744 /* IR invariants disallow function declarations or definitions 5745 * nested within other function definitions. But there is no 5746 * requirement about the relative order of function declarations 5747 * and definitions with respect to one another. So simply insert 5748 * the new ir_function block at the end of the toplevel instruction 5749 * list. 5750 */ 5751 state->toplevel_ir->push_tail(f); 5752 } 5753 5754 5755 ir_rvalue * 5756 ast_function::hir(exec_list *instructions, 5757 struct _mesa_glsl_parse_state *state) 5758 { 5759 void *ctx = state; 5760 ir_function *f = NULL; 5761 ir_function_signature *sig = NULL; 5762 exec_list hir_parameters; 5763 YYLTYPE loc = this->get_location(); 5764 5765 const char *const name = identifier; 5766 5767 /* New functions are always added to the top-level IR instruction stream, 5768 * so this instruction list pointer is ignored. See also emit_function 5769 * (called below). 5770 */ 5771 (void) instructions; 5772 5773 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec, 5774 * 5775 * "Function declarations (prototypes) cannot occur inside of functions; 5776 * they must be at global scope, or for the built-in functions, outside 5777 * the global scope." 5778 * 5779 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec, 5780 * 5781 * "User defined functions may only be defined within the global scope." 5782 * 5783 * Note that this language does not appear in GLSL 1.10. 5784 */ 5785 if ((state->current_function != NULL) && 5786 state->is_version(120, 100)) { 5787 YYLTYPE loc = this->get_location(); 5788 _mesa_glsl_error(&loc, state, 5789 "declaration of function `%s' not allowed within " 5790 "function body", name); 5791 } 5792 5793 validate_identifier(name, this->get_location(), state); 5794 5795 /* Convert the list of function parameters to HIR now so that they can be 5796 * used below to compare this function's signature with previously seen 5797 * signatures for functions with the same name. 5798 */ 5799 ast_parameter_declarator::parameters_to_hir(& this->parameters, 5800 is_definition, 5801 & hir_parameters, state); 5802 5803 const char *return_type_name; 5804 const glsl_type *return_type = 5805 this->return_type->glsl_type(& return_type_name, state); 5806 5807 if (!return_type) { 5808 YYLTYPE loc = this->get_location(); 5809 _mesa_glsl_error(&loc, state, 5810 "function `%s' has undeclared return type `%s'", 5811 name, return_type_name); 5812 return_type = glsl_type::error_type; 5813 } 5814 5815 /* ARB_shader_subroutine states: 5816 * "Subroutine declarations cannot be prototyped. It is an error to prepend 5817 * subroutine(...) to a function declaration." 5818 */ 5819 if (this->return_type->qualifier.subroutine_list && !is_definition) { 5820 YYLTYPE loc = this->get_location(); 5821 _mesa_glsl_error(&loc, state, 5822 "function declaration `%s' cannot have subroutine prepended", 5823 name); 5824 } 5825 5826 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec: 5827 * "No qualifier is allowed on the return type of a function." 5828 */ 5829 if (this->return_type->has_qualifiers(state)) { 5830 YYLTYPE loc = this->get_location(); 5831 _mesa_glsl_error(& loc, state, 5832 "function `%s' return type has qualifiers", name); 5833 } 5834 5835 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says: 5836 * 5837 * "Arrays are allowed as arguments and as the return type. In both 5838 * cases, the array must be explicitly sized." 5839 */ 5840 if (return_type->is_unsized_array()) { 5841 YYLTYPE loc = this->get_location(); 5842 _mesa_glsl_error(& loc, state, 5843 "function `%s' return type array must be explicitly " 5844 "sized", name); 5845 } 5846 5847 /* From Section 6.1 (Function Definitions) of the GLSL 1.00 spec: 5848 * 5849 * "Arrays are allowed as arguments, but not as the return type. [...] 5850 * The return type can also be a structure if the structure does not 5851 * contain an array." 5852 */ 5853 if (state->language_version == 100 && return_type->contains_array()) { 5854 YYLTYPE loc = this->get_location(); 5855 _mesa_glsl_error(& loc, state, 5856 "function `%s' return type contains an array", name); 5857 } 5858 5859 /* From section 4.1.7 of the GLSL 4.40 spec: 5860 * 5861 * "[Opaque types] can only be declared as function parameters 5862 * or uniform-qualified variables." 5863 * 5864 * The ARB_bindless_texture spec doesn't clearly state this, but as it says 5865 * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X, 5866 * (Images)", this should be allowed. 5867 */ 5868 if (return_type->contains_atomic() || 5869 (!state->has_bindless() && return_type->contains_opaque())) { 5870 YYLTYPE loc = this->get_location(); 5871 _mesa_glsl_error(&loc, state, 5872 "function `%s' return type can't contain an %s type", 5873 name, state->has_bindless() ? "atomic" : "opaque"); 5874 } 5875 5876 /**/ 5877 if (return_type->is_subroutine()) { 5878 YYLTYPE loc = this->get_location(); 5879 _mesa_glsl_error(&loc, state, 5880 "function `%s' return type can't be a subroutine type", 5881 name); 5882 } 5883 5884 5885 /* Create an ir_function if one doesn't already exist. */ 5886 f = state->symbols->get_function(name); 5887 if (f == NULL) { 5888 f = new(ctx) ir_function(name); 5889 if (!this->return_type->qualifier.is_subroutine_decl()) { 5890 if (!state->symbols->add_function(f)) { 5891 /* This function name shadows a non-function use of the same name. */ 5892 YYLTYPE loc = this->get_location(); 5893 _mesa_glsl_error(&loc, state, "function name `%s' conflicts with " 5894 "non-function", name); 5895 return NULL; 5896 } 5897 } 5898 emit_function(state, f); 5899 } 5900 5901 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71: 5902 * 5903 * "A shader cannot redefine or overload built-in functions." 5904 * 5905 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions": 5906 * 5907 * "User code can overload the built-in functions but cannot redefine 5908 * them." 5909 */ 5910 if (state->es_shader) { 5911 /* Local shader has no exact candidates; check the built-ins. */ 5912 _mesa_glsl_initialize_builtin_functions(); 5913 if (state->language_version >= 300 && 5914 _mesa_glsl_has_builtin_function(state, name)) { 5915 YYLTYPE loc = this->get_location(); 5916 _mesa_glsl_error(& loc, state, 5917 "A shader cannot redefine or overload built-in " 5918 "function `%s' in GLSL ES 3.00", name); 5919 return NULL; 5920 } 5921 5922 if (state->language_version == 100) { 5923 ir_function_signature *sig = 5924 _mesa_glsl_find_builtin_function(state, name, &hir_parameters); 5925 if (sig && sig->is_builtin()) { 5926 _mesa_glsl_error(& loc, state, 5927 "A shader cannot redefine built-in " 5928 "function `%s' in GLSL ES 1.00", name); 5929 } 5930 } 5931 } 5932 5933 /* Verify that this function's signature either doesn't match a previously 5934 * seen signature for a function with the same name, or, if a match is found, 5935 * that the previously seen signature does not have an associated definition. 5936 */ 5937 if (state->es_shader || f->has_user_signature()) { 5938 sig = f->exact_matching_signature(state, &hir_parameters); 5939 if (sig != NULL) { 5940 const char *badvar = sig->qualifiers_match(&hir_parameters); 5941 if (badvar != NULL) { 5942 YYLTYPE loc = this->get_location(); 5943 5944 _mesa_glsl_error(&loc, state, "function `%s' parameter `%s' " 5945 "qualifiers don't match prototype", name, badvar); 5946 } 5947 5948 if (sig->return_type != return_type) { 5949 YYLTYPE loc = this->get_location(); 5950 5951 _mesa_glsl_error(&loc, state, "function `%s' return type doesn't " 5952 "match prototype", name); 5953 } 5954 5955 if (sig->is_defined) { 5956 if (is_definition) { 5957 YYLTYPE loc = this->get_location(); 5958 _mesa_glsl_error(& loc, state, "function `%s' redefined", name); 5959 } else { 5960 /* We just encountered a prototype that exactly matches a 5961 * function that's already been defined. This is redundant, 5962 * and we should ignore it. 5963 */ 5964 return NULL; 5965 } 5966 } else if (state->language_version == 100 && !is_definition) { 5967 /* From the GLSL 1.00 spec, section 4.2.7: 5968 * 5969 * "A particular variable, structure or function declaration 5970 * may occur at most once within a scope with the exception 5971 * that a single function prototype plus the corresponding 5972 * function definition are allowed." 5973 */ 5974 YYLTYPE loc = this->get_location(); 5975 _mesa_glsl_error(&loc, state, "function `%s' redeclared", name); 5976 } 5977 } 5978 } 5979 5980 /* Verify the return type of main() */ 5981 if (strcmp(name, "main") == 0) { 5982 if (! return_type->is_void()) { 5983 YYLTYPE loc = this->get_location(); 5984 5985 _mesa_glsl_error(& loc, state, "main() must return void"); 5986 } 5987 5988 if (!hir_parameters.is_empty()) { 5989 YYLTYPE loc = this->get_location(); 5990 5991 _mesa_glsl_error(& loc, state, "main() must not take any parameters"); 5992 } 5993 } 5994 5995 /* Finish storing the information about this new function in its signature. 5996 */ 5997 if (sig == NULL) { 5998 sig = new(ctx) ir_function_signature(return_type); 5999 f->add_signature(sig); 6000 } 6001 6002 sig->replace_parameters(&hir_parameters); 6003 signature = sig; 6004 6005 if (this->return_type->qualifier.subroutine_list) { 6006 int idx; 6007 6008 if (this->return_type->qualifier.flags.q.explicit_index) { 6009 unsigned qual_index; 6010 if (process_qualifier_constant(state, &loc, "index", 6011 this->return_type->qualifier.index, 6012 &qual_index)) { 6013 if (!state->has_explicit_uniform_location()) { 6014 _mesa_glsl_error(&loc, state, "subroutine index requires " 6015 "GL_ARB_explicit_uniform_location or " 6016 "GLSL 4.30"); 6017 } else if (qual_index >= MAX_SUBROUTINES) { 6018 _mesa_glsl_error(&loc, state, 6019 "invalid subroutine index (%d) index must " 6020 "be a number between 0 and " 6021 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index, 6022 MAX_SUBROUTINES - 1); 6023 } else { 6024 f->subroutine_index = qual_index; 6025 } 6026 } 6027 } 6028 6029 f->num_subroutine_types = this->return_type->qualifier.subroutine_list->declarations.length(); 6030 f->subroutine_types = ralloc_array(state, const struct glsl_type *, 6031 f->num_subroutine_types); 6032 idx = 0; 6033 foreach_list_typed(ast_declaration, decl, link, &this->return_type->qualifier.subroutine_list->declarations) { 6034 const struct glsl_type *type; 6035 /* the subroutine type must be already declared */ 6036 type = state->symbols->get_type(decl->identifier); 6037 if (!type) { 6038 _mesa_glsl_error(& loc, state, "unknown type '%s' in subroutine function definition", decl->identifier); 6039 } 6040 6041 for (int i = 0; i < state->num_subroutine_types; i++) { 6042 ir_function *fn = state->subroutine_types[i]; 6043 ir_function_signature *tsig = NULL; 6044 6045 if (strcmp(fn->name, decl->identifier)) 6046 continue; 6047 6048 tsig = fn->matching_signature(state, &sig->parameters, 6049 false); 6050 if (!tsig) { 6051 _mesa_glsl_error(& loc, state, "subroutine type mismatch '%s' - signatures do not match\n", decl->identifier); 6052 } else { 6053 if (tsig->return_type != sig->return_type) { 6054 _mesa_glsl_error(& loc, state, "subroutine type mismatch '%s' - return types do not match\n", decl->identifier); 6055 } 6056 } 6057 } 6058 f->subroutine_types[idx++] = type; 6059 } 6060 state->subroutines = (ir_function **)reralloc(state, state->subroutines, 6061 ir_function *, 6062 state->num_subroutines + 1); 6063 state->subroutines[state->num_subroutines] = f; 6064 state->num_subroutines++; 6065 6066 } 6067 6068 if (this->return_type->qualifier.is_subroutine_decl()) { 6069 if (!state->symbols->add_type(this->identifier, glsl_type::get_subroutine_instance(this->identifier))) { 6070 _mesa_glsl_error(& loc, state, "type '%s' previously defined", this->identifier); 6071 return NULL; 6072 } 6073 state->subroutine_types = (ir_function **)reralloc(state, state->subroutine_types, 6074 ir_function *, 6075 state->num_subroutine_types + 1); 6076 state->subroutine_types[state->num_subroutine_types] = f; 6077 state->num_subroutine_types++; 6078 6079 f->is_subroutine = true; 6080 } 6081 6082 /* Function declarations (prototypes) do not have r-values. 6083 */ 6084 return NULL; 6085 } 6086 6087 6088 ir_rvalue * 6089 ast_function_definition::hir(exec_list *instructions, 6090 struct _mesa_glsl_parse_state *state) 6091 { 6092 prototype->is_definition = true; 6093 prototype->hir(instructions, state); 6094 6095 ir_function_signature *signature = prototype->signature; 6096 if (signature == NULL) 6097 return NULL; 6098 6099 assert(state->current_function == NULL); 6100 state->current_function = signature; 6101 state->found_return = false; 6102 6103 /* Duplicate parameters declared in the prototype as concrete variables. 6104 * Add these to the symbol table. 6105 */ 6106 state->symbols->push_scope(); 6107 foreach_in_list(ir_variable, var, &signature->parameters) { 6108 assert(var->as_variable() != NULL); 6109 6110 /* The only way a parameter would "exist" is if two parameters have 6111 * the same name. 6112 */ 6113 if (state->symbols->name_declared_this_scope(var->name)) { 6114 YYLTYPE loc = this->get_location(); 6115 6116 _mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name); 6117 } else { 6118 state->symbols->add_variable(var); 6119 } 6120 } 6121 6122 /* Convert the body of the function to HIR. */ 6123 this->body->hir(&signature->body, state); 6124 signature->is_defined = true; 6125 6126 state->symbols->pop_scope(); 6127 6128 assert(state->current_function == signature); 6129 state->current_function = NULL; 6130 6131 if (!signature->return_type->is_void() && !state->found_return) { 6132 YYLTYPE loc = this->get_location(); 6133 _mesa_glsl_error(& loc, state, "function `%s' has non-void return type " 6134 "%s, but no return statement", 6135 signature->function_name(), 6136 signature->return_type->name); 6137 } 6138 6139 /* Function definitions do not have r-values. 6140 */ 6141 return NULL; 6142 } 6143 6144 6145 ir_rvalue * 6146 ast_jump_statement::hir(exec_list *instructions, 6147 struct _mesa_glsl_parse_state *state) 6148 { 6149 void *ctx = state; 6150 6151 switch (mode) { 6152 case ast_return: { 6153 ir_return *inst; 6154 assert(state->current_function); 6155 6156 if (opt_return_value) { 6157 ir_rvalue *ret = opt_return_value->hir(instructions, state); 6158 6159 /* The value of the return type can be NULL if the shader says 6160 * 'return foo();' and foo() is a function that returns void. 6161 * 6162 * NOTE: The GLSL spec doesn't say that this is an error. The type 6163 * of the return value is void. If the return type of the function is 6164 * also void, then this should compile without error. Seriously. 6165 */ 6166 const glsl_type *const ret_type = 6167 (ret == NULL) ? glsl_type::void_type : ret->type; 6168 6169 /* Implicit conversions are not allowed for return values prior to 6170 * ARB_shading_language_420pack. 6171 */ 6172 if (state->current_function->return_type != ret_type) { 6173 YYLTYPE loc = this->get_location(); 6174 6175 if (state->has_420pack()) { 6176 if (!apply_implicit_conversion(state->current_function->return_type, 6177 ret, state)) { 6178 _mesa_glsl_error(& loc, state, 6179 "could not implicitly convert return value " 6180 "to %s, in function `%s'", 6181 state->current_function->return_type->name, 6182 state->current_function->function_name()); 6183 } 6184 } else { 6185 _mesa_glsl_error(& loc, state, 6186 "`return' with wrong type %s, in function `%s' " 6187 "returning %s", 6188 ret_type->name, 6189 state->current_function->function_name(), 6190 state->current_function->return_type->name); 6191 } 6192 } else if (state->current_function->return_type->base_type == 6193 GLSL_TYPE_VOID) { 6194 YYLTYPE loc = this->get_location(); 6195 6196 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20 6197 * specs add a clarification: 6198 * 6199 * "A void function can only use return without a return argument, even if 6200 * the return argument has void type. Return statements only accept values: 6201 * 6202 * void func1() { } 6203 * void func2() { return func1(); } // illegal return statement" 6204 */ 6205 _mesa_glsl_error(& loc, state, 6206 "void functions can only use `return' without a " 6207 "return argument"); 6208 } 6209 6210 inst = new(ctx) ir_return(ret); 6211 } else { 6212 if (state->current_function->return_type->base_type != 6213 GLSL_TYPE_VOID) { 6214 YYLTYPE loc = this->get_location(); 6215 6216 _mesa_glsl_error(& loc, state, 6217 "`return' with no value, in function %s returning " 6218 "non-void", 6219 state->current_function->function_name()); 6220 } 6221 inst = new(ctx) ir_return; 6222 } 6223 6224 state->found_return = true; 6225 instructions->push_tail(inst); 6226 break; 6227 } 6228 6229 case ast_discard: 6230 if (state->stage != MESA_SHADER_FRAGMENT) { 6231 YYLTYPE loc = this->get_location(); 6232 6233 _mesa_glsl_error(& loc, state, 6234 "`discard' may only appear in a fragment shader"); 6235 } 6236 instructions->push_tail(new(ctx) ir_discard); 6237 break; 6238 6239 case ast_break: 6240 case ast_continue: 6241 if (mode == ast_continue && 6242 state->loop_nesting_ast == NULL) { 6243 YYLTYPE loc = this->get_location(); 6244 6245 _mesa_glsl_error(& loc, state, "continue may only appear in a loop"); 6246 } else if (mode == ast_break && 6247 state->loop_nesting_ast == NULL && 6248 state->switch_state.switch_nesting_ast == NULL) { 6249 YYLTYPE loc = this->get_location(); 6250 6251 _mesa_glsl_error(& loc, state, 6252 "break may only appear in a loop or a switch"); 6253 } else { 6254 /* For a loop, inline the for loop expression again, since we don't 6255 * know where near the end of the loop body the normal copy of it is 6256 * going to be placed. Same goes for the condition for a do-while 6257 * loop. 6258 */ 6259 if (state->loop_nesting_ast != NULL && 6260 mode == ast_continue && !state->switch_state.is_switch_innermost) { 6261 if (state->loop_nesting_ast->rest_expression) { 6262 state->loop_nesting_ast->rest_expression->hir(instructions, 6263 state); 6264 } 6265 if (state->loop_nesting_ast->mode == 6266 ast_iteration_statement::ast_do_while) { 6267 state->loop_nesting_ast->condition_to_hir(instructions, state); 6268 } 6269 } 6270 6271 if (state->switch_state.is_switch_innermost && 6272 mode == ast_continue) { 6273 /* Set 'continue_inside' to true. */ 6274 ir_rvalue *const true_val = new (ctx) ir_constant(true); 6275 ir_dereference_variable *deref_continue_inside_var = 6276 new(ctx) ir_dereference_variable(state->switch_state.continue_inside); 6277 instructions->push_tail(new(ctx) ir_assignment(deref_continue_inside_var, 6278 true_val)); 6279 6280 /* Break out from the switch, continue for the loop will 6281 * be called right after switch. */ 6282 ir_loop_jump *const jump = 6283 new(ctx) ir_loop_jump(ir_loop_jump::jump_break); 6284 instructions->push_tail(jump); 6285 6286 } else if (state->switch_state.is_switch_innermost && 6287 mode == ast_break) { 6288 /* Force break out of switch by inserting a break. */ 6289 ir_loop_jump *const jump = 6290 new(ctx) ir_loop_jump(ir_loop_jump::jump_break); 6291 instructions->push_tail(jump); 6292 } else { 6293 ir_loop_jump *const jump = 6294 new(ctx) ir_loop_jump((mode == ast_break) 6295 ? ir_loop_jump::jump_break 6296 : ir_loop_jump::jump_continue); 6297 instructions->push_tail(jump); 6298 } 6299 } 6300 6301 break; 6302 } 6303 6304 /* Jump instructions do not have r-values. 6305 */ 6306 return NULL; 6307 } 6308 6309 6310 ir_rvalue * 6311 ast_selection_statement::hir(exec_list *instructions, 6312 struct _mesa_glsl_parse_state *state) 6313 { 6314 void *ctx = state; 6315 6316 ir_rvalue *const condition = this->condition->hir(instructions, state); 6317 6318 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec: 6319 * 6320 * "Any expression whose type evaluates to a Boolean can be used as the 6321 * conditional expression bool-expression. Vector types are not accepted 6322 * as the expression to if." 6323 * 6324 * The checks are separated so that higher quality diagnostics can be 6325 * generated for cases where both rules are violated. 6326 */ 6327 if (!condition->type->is_boolean() || !condition->type->is_scalar()) { 6328 YYLTYPE loc = this->condition->get_location(); 6329 6330 _mesa_glsl_error(& loc, state, "if-statement condition must be scalar " 6331 "boolean"); 6332 } 6333 6334 ir_if *const stmt = new(ctx) ir_if(condition); 6335 6336 if (then_statement != NULL) { 6337 state->symbols->push_scope(); 6338 then_statement->hir(& stmt->then_instructions, state); 6339 state->symbols->pop_scope(); 6340 } 6341 6342 if (else_statement != NULL) { 6343 state->symbols->push_scope(); 6344 else_statement->hir(& stmt->else_instructions, state); 6345 state->symbols->pop_scope(); 6346 } 6347 6348 instructions->push_tail(stmt); 6349 6350 /* if-statements do not have r-values. 6351 */ 6352 return NULL; 6353 } 6354 6355 6356 struct case_label { 6357 /** Value of the case label. */ 6358 unsigned value; 6359 6360 /** Does this label occur after the default? */ 6361 bool after_default; 6362 6363 /** 6364 * AST for the case label. 6365 * 6366 * This is only used to generate error messages for duplicate labels. 6367 */ 6368 ast_expression *ast; 6369 }; 6370 6371 /* Used for detection of duplicate case values, compare 6372 * given contents directly. 6373 */ 6374 static bool 6375 compare_case_value(const void *a, const void *b) 6376 { 6377 return ((struct case_label *) a)->value == ((struct case_label *) b)->value; 6378 } 6379 6380 6381 /* Used for detection of duplicate case values, just 6382 * returns key contents as is. 6383 */ 6384 static unsigned 6385 key_contents(const void *key) 6386 { 6387 return ((struct case_label *) key)->value; 6388 } 6389 6390 6391 ir_rvalue * 6392 ast_switch_statement::hir(exec_list *instructions, 6393 struct _mesa_glsl_parse_state *state) 6394 { 6395 void *ctx = state; 6396 6397 ir_rvalue *const test_expression = 6398 this->test_expression->hir(instructions, state); 6399 6400 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec: 6401 * 6402 * "The type of init-expression in a switch statement must be a 6403 * scalar integer." 6404 */ 6405 if (!test_expression->type->is_scalar() || 6406 !test_expression->type->is_integer()) { 6407 YYLTYPE loc = this->test_expression->get_location(); 6408 6409 _mesa_glsl_error(& loc, 6410 state, 6411 "switch-statement expression must be scalar " 6412 "integer"); 6413 return NULL; 6414 } 6415 6416 /* Track the switch-statement nesting in a stack-like manner. 6417 */ 6418 struct glsl_switch_state saved = state->switch_state; 6419 6420 state->switch_state.is_switch_innermost = true; 6421 state->switch_state.switch_nesting_ast = this; 6422 state->switch_state.labels_ht = 6423 _mesa_hash_table_create(NULL, key_contents, 6424 compare_case_value); 6425 state->switch_state.previous_default = NULL; 6426 6427 /* Initalize is_fallthru state to false. 6428 */ 6429 ir_rvalue *const is_fallthru_val = new (ctx) ir_constant(false); 6430 state->switch_state.is_fallthru_var = 6431 new(ctx) ir_variable(glsl_type::bool_type, 6432 "switch_is_fallthru_tmp", 6433 ir_var_temporary); 6434 instructions->push_tail(state->switch_state.is_fallthru_var); 6435 6436 ir_dereference_variable *deref_is_fallthru_var = 6437 new(ctx) ir_dereference_variable(state->switch_state.is_fallthru_var); 6438 instructions->push_tail(new(ctx) ir_assignment(deref_is_fallthru_var, 6439 is_fallthru_val)); 6440 6441 /* Initialize continue_inside state to false. 6442 */ 6443 state->switch_state.continue_inside = 6444 new(ctx) ir_variable(glsl_type::bool_type, 6445 "continue_inside_tmp", 6446 ir_var_temporary); 6447 instructions->push_tail(state->switch_state.continue_inside); 6448 6449 ir_rvalue *const false_val = new (ctx) ir_constant(false); 6450 ir_dereference_variable *deref_continue_inside_var = 6451 new(ctx) ir_dereference_variable(state->switch_state.continue_inside); 6452 instructions->push_tail(new(ctx) ir_assignment(deref_continue_inside_var, 6453 false_val)); 6454 6455 state->switch_state.run_default = 6456 new(ctx) ir_variable(glsl_type::bool_type, 6457 "run_default_tmp", 6458 ir_var_temporary); 6459 instructions->push_tail(state->switch_state.run_default); 6460 6461 /* Loop around the switch is used for flow control. */ 6462 ir_loop * loop = new(ctx) ir_loop(); 6463 instructions->push_tail(loop); 6464 6465 /* Cache test expression. 6466 */ 6467 test_to_hir(&loop->body_instructions, state); 6468 6469 /* Emit code for body of switch stmt. 6470 */ 6471 body->hir(&loop->body_instructions, state); 6472 6473 /* Insert a break at the end to exit loop. */ 6474 ir_loop_jump *jump = new(ctx) ir_loop_jump(ir_loop_jump::jump_break); 6475 loop->body_instructions.push_tail(jump); 6476 6477 /* If we are inside loop, check if continue got called inside switch. */ 6478 if (state->loop_nesting_ast != NULL) { 6479 ir_dereference_variable *deref_continue_inside = 6480 new(ctx) ir_dereference_variable(state->switch_state.continue_inside); 6481 ir_if *irif = new(ctx) ir_if(deref_continue_inside); 6482 ir_loop_jump *jump = new(ctx) ir_loop_jump(ir_loop_jump::jump_continue); 6483 6484 if (state->loop_nesting_ast != NULL) { 6485 if (state->loop_nesting_ast->rest_expression) { 6486 state->loop_nesting_ast->rest_expression->hir(&irif->then_instructions, 6487 state); 6488 } 6489 if (state->loop_nesting_ast->mode == 6490 ast_iteration_statement::ast_do_while) { 6491 state->loop_nesting_ast->condition_to_hir(&irif->then_instructions, state); 6492 } 6493 } 6494 irif->then_instructions.push_tail(jump); 6495 instructions->push_tail(irif); 6496 } 6497 6498 _mesa_hash_table_destroy(state->switch_state.labels_ht, NULL); 6499 6500 state->switch_state = saved; 6501 6502 /* Switch statements do not have r-values. */ 6503 return NULL; 6504 } 6505 6506 6507 void 6508 ast_switch_statement::test_to_hir(exec_list *instructions, 6509 struct _mesa_glsl_parse_state *state) 6510 { 6511 void *ctx = state; 6512 6513 /* set to true to avoid a duplicate "use of uninitialized variable" warning 6514 * on the switch test case. The first one would be already raised when 6515 * getting the test_expression at ast_switch_statement::hir 6516 */ 6517 test_expression->set_is_lhs(true); 6518 /* Cache value of test expression. */ 6519 ir_rvalue *const test_val = test_expression->hir(instructions, state); 6520 6521 state->switch_state.test_var = new(ctx) ir_variable(test_val->type, 6522 "switch_test_tmp", 6523 ir_var_temporary); 6524 ir_dereference_variable *deref_test_var = 6525 new(ctx) ir_dereference_variable(state->switch_state.test_var); 6526 6527 instructions->push_tail(state->switch_state.test_var); 6528 instructions->push_tail(new(ctx) ir_assignment(deref_test_var, test_val)); 6529 } 6530 6531 6532 ir_rvalue * 6533 ast_switch_body::hir(exec_list *instructions, 6534 struct _mesa_glsl_parse_state *state) 6535 { 6536 if (stmts != NULL) 6537 stmts->hir(instructions, state); 6538 6539 /* Switch bodies do not have r-values. */ 6540 return NULL; 6541 } 6542 6543 ir_rvalue * 6544 ast_case_statement_list::hir(exec_list *instructions, 6545 struct _mesa_glsl_parse_state *state) 6546 { 6547 exec_list default_case, after_default, tmp; 6548 6549 foreach_list_typed (ast_case_statement, case_stmt, link, & this->cases) { 6550 case_stmt->hir(&tmp, state); 6551 6552 /* Default case. */ 6553 if (state->switch_state.previous_default && default_case.is_empty()) { 6554 default_case.append_list(&tmp); 6555 continue; 6556 } 6557 6558 /* If default case found, append 'after_default' list. */ 6559 if (!default_case.is_empty()) 6560 after_default.append_list(&tmp); 6561 else 6562 instructions->append_list(&tmp); 6563 } 6564 6565 /* Handle the default case. This is done here because default might not be 6566 * the last case. We need to add checks against following cases first to see 6567 * if default should be chosen or not. 6568 */ 6569 if (!default_case.is_empty()) { 6570 struct hash_entry *entry; 6571 ir_factory body(instructions, state); 6572 6573 ir_expression *cmp = NULL; 6574 6575 hash_table_foreach(state->switch_state.labels_ht, entry) { 6576 const struct case_label *const l = (struct case_label *) entry->data; 6577 6578 /* If the switch init-value is the value of one of the labels that 6579 * occurs after the default case, disable execution of the default 6580 * case. 6581 */ 6582 if (l->after_default) { 6583 ir_constant *const cnst = 6584 state->switch_state.test_var->type->base_type == GLSL_TYPE_UINT 6585 ? body.constant(unsigned(l->value)) 6586 : body.constant(int(l->value)); 6587 6588 cmp = cmp == NULL 6589 ? equal(cnst, state->switch_state.test_var) 6590 : logic_or(cmp, equal(cnst, state->switch_state.test_var)); 6591 } 6592 } 6593 6594 if (cmp != NULL) 6595 body.emit(assign(state->switch_state.run_default, logic_not(cmp))); 6596 else 6597 body.emit(assign(state->switch_state.run_default, body.constant(true))); 6598 6599 /* Append default case and all cases after it. */ 6600 instructions->append_list(&default_case); 6601 instructions->append_list(&after_default); 6602 } 6603 6604 /* Case statements do not have r-values. */ 6605 return NULL; 6606 } 6607 6608 ir_rvalue * 6609 ast_case_statement::hir(exec_list *instructions, 6610 struct _mesa_glsl_parse_state *state) 6611 { 6612 labels->hir(instructions, state); 6613 6614 /* Guard case statements depending on fallthru state. */ 6615 ir_dereference_variable *const deref_fallthru_guard = 6616 new(state) ir_dereference_variable(state->switch_state.is_fallthru_var); 6617 ir_if *const test_fallthru = new(state) ir_if(deref_fallthru_guard); 6618 6619 foreach_list_typed (ast_node, stmt, link, & this->stmts) 6620 stmt->hir(& test_fallthru->then_instructions, state); 6621 6622 instructions->push_tail(test_fallthru); 6623 6624 /* Case statements do not have r-values. */ 6625 return NULL; 6626 } 6627 6628 6629 ir_rvalue * 6630 ast_case_label_list::hir(exec_list *instructions, 6631 struct _mesa_glsl_parse_state *state) 6632 { 6633 foreach_list_typed (ast_case_label, label, link, & this->labels) 6634 label->hir(instructions, state); 6635 6636 /* Case labels do not have r-values. */ 6637 return NULL; 6638 } 6639 6640 ir_rvalue * 6641 ast_case_label::hir(exec_list *instructions, 6642 struct _mesa_glsl_parse_state *state) 6643 { 6644 ir_factory body(instructions, state); 6645 6646 ir_variable *const fallthru_var = state->switch_state.is_fallthru_var; 6647 6648 /* If not default case, ... */ 6649 if (this->test_value != NULL) { 6650 /* Conditionally set fallthru state based on 6651 * comparison of cached test expression value to case label. 6652 */ 6653 ir_rvalue *const label_rval = this->test_value->hir(instructions, state); 6654 ir_constant *label_const = 6655 label_rval->constant_expression_value(body.mem_ctx); 6656 6657 if (!label_const) { 6658 YYLTYPE loc = this->test_value->get_location(); 6659 6660 _mesa_glsl_error(& loc, state, 6661 "switch statement case label must be a " 6662 "constant expression"); 6663 6664 /* Stuff a dummy value in to allow processing to continue. */ 6665 label_const = body.constant(0); 6666 } else { 6667 hash_entry *entry = 6668 _mesa_hash_table_search(state->switch_state.labels_ht, 6669 &label_const->value.u[0]); 6670 6671 if (entry) { 6672 const struct case_label *const l = 6673 (struct case_label *) entry->data; 6674 const ast_expression *const previous_label = l->ast; 6675 YYLTYPE loc = this->test_value->get_location(); 6676 6677 _mesa_glsl_error(& loc, state, "duplicate case value"); 6678 6679 loc = previous_label->get_location(); 6680 _mesa_glsl_error(& loc, state, "this is the previous case label"); 6681 } else { 6682 struct case_label *l = ralloc(state->switch_state.labels_ht, 6683 struct case_label); 6684 6685 l->value = label_const->value.u[0]; 6686 l->after_default = state->switch_state.previous_default != NULL; 6687 l->ast = this->test_value; 6688 6689 _mesa_hash_table_insert(state->switch_state.labels_ht, 6690 &label_const->value.u[0], 6691 l); 6692 } 6693 } 6694 6695 /* Create an r-value version of the ir_constant label here (after we may 6696 * have created a fake one in error cases) that can be passed to 6697 * apply_implicit_conversion below. 6698 */ 6699 ir_rvalue *label = label_const; 6700 6701 ir_rvalue *deref_test_var = 6702 new(body.mem_ctx) ir_dereference_variable(state->switch_state.test_var); 6703 6704 /* 6705 * From GLSL 4.40 specification section 6.2 ("Selection"): 6706 * 6707 * "The type of the init-expression value in a switch statement must 6708 * be a scalar int or uint. The type of the constant-expression value 6709 * in a case label also must be a scalar int or uint. When any pair 6710 * of these values is tested for "equal value" and the types do not 6711 * match, an implicit conversion will be done to convert the int to a 6712 * uint (see section 4.1.10 Implicit Conversions) before the compare 6713 * is done." 6714 */ 6715 if (label->type != state->switch_state.test_var->type) { 6716 YYLTYPE loc = this->test_value->get_location(); 6717 6718 const glsl_type *type_a = label->type; 6719 const glsl_type *type_b = state->switch_state.test_var->type; 6720 6721 /* Check if int->uint implicit conversion is supported. */ 6722 bool integer_conversion_supported = 6723 glsl_type::int_type->can_implicitly_convert_to(glsl_type::uint_type, 6724 state); 6725 6726 if ((!type_a->is_integer() || !type_b->is_integer()) || 6727 !integer_conversion_supported) { 6728 _mesa_glsl_error(&loc, state, "type mismatch with switch " 6729 "init-expression and case label (%s != %s)", 6730 type_a->name, type_b->name); 6731 } else { 6732 /* Conversion of the case label. */ 6733 if (type_a->base_type == GLSL_TYPE_INT) { 6734 if (!apply_implicit_conversion(glsl_type::uint_type, 6735 label, state)) 6736 _mesa_glsl_error(&loc, state, "implicit type conversion error"); 6737 } else { 6738 /* Conversion of the init-expression value. */ 6739 if (!apply_implicit_conversion(glsl_type::uint_type, 6740 deref_test_var, state)) 6741 _mesa_glsl_error(&loc, state, "implicit type conversion error"); 6742 } 6743 } 6744 6745 /* If the implicit conversion was allowed, the types will already be 6746 * the same. If the implicit conversion wasn't allowed, smash the 6747 * type of the label anyway. This will prevent the expression 6748 * constructor (below) from failing an assertion. 6749 */ 6750 label->type = deref_test_var->type; 6751 } 6752 6753 body.emit(assign(fallthru_var, 6754 logic_or(fallthru_var, equal(label, deref_test_var)))); 6755 } else { /* default case */ 6756 if (state->switch_state.previous_default) { 6757 YYLTYPE loc = this->get_location(); 6758 _mesa_glsl_error(& loc, state, 6759 "multiple default labels in one switch"); 6760 6761 loc = state->switch_state.previous_default->get_location(); 6762 _mesa_glsl_error(& loc, state, "this is the first default label"); 6763 } 6764 state->switch_state.previous_default = this; 6765 6766 /* Set fallthru condition on 'run_default' bool. */ 6767 body.emit(assign(fallthru_var, 6768 logic_or(fallthru_var, 6769 state->switch_state.run_default))); 6770 } 6771 6772 /* Case statements do not have r-values. */ 6773 return NULL; 6774 } 6775 6776 void 6777 ast_iteration_statement::condition_to_hir(exec_list *instructions, 6778 struct _mesa_glsl_parse_state *state) 6779 { 6780 void *ctx = state; 6781 6782 if (condition != NULL) { 6783 ir_rvalue *const cond = 6784 condition->hir(instructions, state); 6785 6786 if ((cond == NULL) 6787 || !cond->type->is_boolean() || !cond->type->is_scalar()) { 6788 YYLTYPE loc = condition->get_location(); 6789 6790 _mesa_glsl_error(& loc, state, 6791 "loop condition must be scalar boolean"); 6792 } else { 6793 /* As the first code in the loop body, generate a block that looks 6794 * like 'if (!condition) break;' as the loop termination condition. 6795 */ 6796 ir_rvalue *const not_cond = 6797 new(ctx) ir_expression(ir_unop_logic_not, cond); 6798 6799 ir_if *const if_stmt = new(ctx) ir_if(not_cond); 6800 6801 ir_jump *const break_stmt = 6802 new(ctx) ir_loop_jump(ir_loop_jump::jump_break); 6803 6804 if_stmt->then_instructions.push_tail(break_stmt); 6805 instructions->push_tail(if_stmt); 6806 } 6807 } 6808 } 6809 6810 6811 ir_rvalue * 6812 ast_iteration_statement::hir(exec_list *instructions, 6813 struct _mesa_glsl_parse_state *state) 6814 { 6815 void *ctx = state; 6816 6817 /* For-loops and while-loops start a new scope, but do-while loops do not. 6818 */ 6819 if (mode != ast_do_while) 6820 state->symbols->push_scope(); 6821 6822 if (init_statement != NULL) 6823 init_statement->hir(instructions, state); 6824 6825 ir_loop *const stmt = new(ctx) ir_loop(); 6826 instructions->push_tail(stmt); 6827 6828 /* Track the current loop nesting. */ 6829 ast_iteration_statement *nesting_ast = state->loop_nesting_ast; 6830 6831 state->loop_nesting_ast = this; 6832 6833 /* Likewise, indicate that following code is closest to a loop, 6834 * NOT closest to a switch. 6835 */ 6836 bool saved_is_switch_innermost = state->switch_state.is_switch_innermost; 6837 state->switch_state.is_switch_innermost = false; 6838 6839 if (mode != ast_do_while) 6840 condition_to_hir(&stmt->body_instructions, state); 6841 6842 if (body != NULL) 6843 body->hir(& stmt->body_instructions, state); 6844 6845 if (rest_expression != NULL) 6846 rest_expression->hir(& stmt->body_instructions, state); 6847 6848 if (mode == ast_do_while) 6849 condition_to_hir(&stmt->body_instructions, state); 6850 6851 if (mode != ast_do_while) 6852 state->symbols->pop_scope(); 6853 6854 /* Restore previous nesting before returning. */ 6855 state->loop_nesting_ast = nesting_ast; 6856 state->switch_state.is_switch_innermost = saved_is_switch_innermost; 6857 6858 /* Loops do not have r-values. 6859 */ 6860 return NULL; 6861 } 6862 6863 6864 /** 6865 * Determine if the given type is valid for establishing a default precision 6866 * qualifier. 6867 * 6868 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"): 6869 * 6870 * "The precision statement 6871 * 6872 * precision precision-qualifier type; 6873 * 6874 * can be used to establish a default precision qualifier. The type field 6875 * can be either int or float or any of the sampler types, and the 6876 * precision-qualifier can be lowp, mediump, or highp." 6877 * 6878 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision 6879 * qualifiers on sampler types, but this seems like an oversight (since the 6880 * intention of including these in GLSL 1.30 is to allow compatibility with ES 6881 * shaders). So we allow int, float, and all sampler types regardless of GLSL 6882 * version. 6883 */ 6884 static bool 6885 is_valid_default_precision_type(const struct glsl_type *const type) 6886 { 6887 if (type == NULL) 6888 return false; 6889 6890 switch (type->base_type) { 6891 case GLSL_TYPE_INT: 6892 case GLSL_TYPE_FLOAT: 6893 /* "int" and "float" are valid, but vectors and matrices are not. */ 6894 return type->vector_elements == 1 && type->matrix_columns == 1; 6895 case GLSL_TYPE_SAMPLER: 6896 case GLSL_TYPE_IMAGE: 6897 case GLSL_TYPE_ATOMIC_UINT: 6898 return true; 6899 default: 6900 return false; 6901 } 6902 } 6903 6904 6905 ir_rvalue * 6906 ast_type_specifier::hir(exec_list *instructions, 6907 struct _mesa_glsl_parse_state *state) 6908 { 6909 if (this->default_precision == ast_precision_none && this->structure == NULL) 6910 return NULL; 6911 6912 YYLTYPE loc = this->get_location(); 6913 6914 /* If this is a precision statement, check that the type to which it is 6915 * applied is either float or int. 6916 * 6917 * From section 4.5.3 of the GLSL 1.30 spec: 6918 * "The precision statement 6919 * precision precision-qualifier type; 6920 * can be used to establish a default precision qualifier. The type 6921 * field can be either int or float [...]. Any other types or 6922 * qualifiers will result in an error. 6923 */ 6924 if (this->default_precision != ast_precision_none) { 6925 if (!state->check_precision_qualifiers_allowed(&loc)) 6926 return NULL; 6927 6928 if (this->structure != NULL) { 6929 _mesa_glsl_error(&loc, state, 6930 "precision qualifiers do not apply to structures"); 6931 return NULL; 6932 } 6933 6934 if (this->array_specifier != NULL) { 6935 _mesa_glsl_error(&loc, state, 6936 "default precision statements do not apply to " 6937 "arrays"); 6938 return NULL; 6939 } 6940 6941 const struct glsl_type *const type = 6942 state->symbols->get_type(this->type_name); 6943 if (!is_valid_default_precision_type(type)) { 6944 _mesa_glsl_error(&loc, state, 6945 "default precision statements apply only to " 6946 "float, int, and opaque types"); 6947 return NULL; 6948 } 6949 6950 if (state->es_shader) { 6951 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00 6952 * spec says: 6953 * 6954 * "Non-precision qualified declarations will use the precision 6955 * qualifier specified in the most recent precision statement 6956 * that is still in scope. The precision statement has the same 6957 * scoping rules as variable declarations. If it is declared 6958 * inside a compound statement, its effect stops at the end of 6959 * the innermost statement it was declared in. Precision 6960 * statements in nested scopes override precision statements in 6961 * outer scopes. Multiple precision statements for the same basic 6962 * type can appear inside the same scope, with later statements 6963 * overriding earlier statements within that scope." 6964 * 6965 * Default precision specifications follow the same scope rules as 6966 * variables. So, we can track the state of the default precision 6967 * qualifiers in the symbol table, and the rules will just work. This 6968 * is a slight abuse of the symbol table, but it has the semantics 6969 * that we want. 6970 */ 6971 state->symbols->add_default_precision_qualifier(this->type_name, 6972 this->default_precision); 6973 } 6974 6975 /* FINISHME: Translate precision statements into IR. */ 6976 return NULL; 6977 } 6978 6979 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that 6980 * process_record_constructor() can do type-checking on C-style initializer 6981 * expressions of structs, but ast_struct_specifier should only be translated 6982 * to HIR if it is declaring the type of a structure. 6983 * 6984 * The ->is_declaration field is false for initializers of variables 6985 * declared separately from the struct's type definition. 6986 * 6987 * struct S { ... }; (is_declaration = true) 6988 * struct T { ... } t = { ... }; (is_declaration = true) 6989 * S s = { ... }; (is_declaration = false) 6990 */ 6991 if (this->structure != NULL && this->structure->is_declaration) 6992 return this->structure->hir(instructions, state); 6993 6994 return NULL; 6995 } 6996 6997 6998 /** 6999 * Process a structure or interface block tree into an array of structure fields 7000 * 7001 * After parsing, where there are some syntax differnces, structures and 7002 * interface blocks are almost identical. They are similar enough that the 7003 * AST for each can be processed the same way into a set of 7004 * \c glsl_struct_field to describe the members. 7005 * 7006 * If we're processing an interface block, var_mode should be the type of the 7007 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or 7008 * ir_var_shader_storage). If we're processing a structure, var_mode should be 7009 * ir_var_auto. 7010 * 7011 * \return 7012 * The number of fields processed. A pointer to the array structure fields is 7013 * stored in \c *fields_ret. 7014 */ 7015 static unsigned 7016 ast_process_struct_or_iface_block_members(exec_list *instructions, 7017 struct _mesa_glsl_parse_state *state, 7018 exec_list *declarations, 7019 glsl_struct_field **fields_ret, 7020 bool is_interface, 7021 enum glsl_matrix_layout matrix_layout, 7022 bool allow_reserved_names, 7023 ir_variable_mode var_mode, 7024 ast_type_qualifier *layout, 7025 unsigned block_stream, 7026 unsigned block_xfb_buffer, 7027 unsigned block_xfb_offset, 7028 unsigned expl_location, 7029 unsigned expl_align) 7030 { 7031 unsigned decl_count = 0; 7032 unsigned next_offset = 0; 7033 7034 /* Make an initial pass over the list of fields to determine how 7035 * many there are. Each element in this list is an ast_declarator_list. 7036 * This means that we actually need to count the number of elements in the 7037 * 'declarations' list in each of the elements. 7038 */ 7039 foreach_list_typed (ast_declarator_list, decl_list, link, declarations) { 7040 decl_count += decl_list->declarations.length(); 7041 } 7042 7043 /* Allocate storage for the fields and process the field 7044 * declarations. As the declarations are processed, try to also convert 7045 * the types to HIR. This ensures that structure definitions embedded in 7046 * other structure definitions or in interface blocks are processed. 7047 */ 7048 glsl_struct_field *const fields = rzalloc_array(state, glsl_struct_field, 7049 decl_count); 7050 7051 bool first_member = true; 7052 bool first_member_has_explicit_location = false; 7053 7054 unsigned i = 0; 7055 foreach_list_typed (ast_declarator_list, decl_list, link, declarations) { 7056 const char *type_name; 7057 YYLTYPE loc = decl_list->get_location(); 7058 7059 decl_list->type->specifier->hir(instructions, state); 7060 7061 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says: 7062 * 7063 * "Anonymous structures are not supported; so embedded structures 7064 * must have a declarator. A name given to an embedded struct is 7065 * scoped at the same level as the struct it is embedded in." 7066 * 7067 * The same section of the GLSL 1.20 spec says: 7068 * 7069 * "Anonymous structures are not supported. Embedded structures are 7070 * not supported." 7071 * 7072 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow 7073 * embedded structures in 1.10 only. 7074 */ 7075 if (state->language_version != 110 && 7076 decl_list->type->specifier->structure != NULL) 7077 _mesa_glsl_error(&loc, state, 7078 "embedded structure declarations are not allowed"); 7079 7080 const glsl_type *decl_type = 7081 decl_list->type->glsl_type(& type_name, state); 7082 7083 const struct ast_type_qualifier *const qual = 7084 &decl_list->type->qualifier; 7085 7086 /* From section 4.3.9 of the GLSL 4.40 spec: 7087 * 7088 * "[In interface blocks] opaque types are not allowed." 7089 * 7090 * It should be impossible for decl_type to be NULL here. Cases that 7091 * might naturally lead to decl_type being NULL, especially for the 7092 * is_interface case, will have resulted in compilation having 7093 * already halted due to a syntax error. 7094 */ 7095 assert(decl_type); 7096 7097 if (is_interface) { 7098 /* From section 4.3.7 of the ARB_bindless_texture spec: 7099 * 7100 * "(remove the following bullet from the last list on p. 39, 7101 * thereby permitting sampler types in interface blocks; image 7102 * types are also permitted in blocks by this extension)" 7103 * 7104 * * sampler types are not allowed 7105 */ 7106 if (decl_type->contains_atomic() || 7107 (!state->has_bindless() && decl_type->contains_opaque())) { 7108 _mesa_glsl_error(&loc, state, "uniform/buffer in non-default " 7109 "interface block contains %s variable", 7110 state->has_bindless() ? "atomic" : "opaque"); 7111 } 7112 } else { 7113 if (decl_type->contains_atomic()) { 7114 /* From section 4.1.7.3 of the GLSL 4.40 spec: 7115 * 7116 * "Members of structures cannot be declared as atomic counter 7117 * types." 7118 */ 7119 _mesa_glsl_error(&loc, state, "atomic counter in structure"); 7120 } 7121 7122 if (!state->has_bindless() && decl_type->contains_image()) { 7123 /* FINISHME: Same problem as with atomic counters. 7124 * FINISHME: Request clarification from Khronos and add 7125 * FINISHME: spec quotation here. 7126 */ 7127 _mesa_glsl_error(&loc, state, "image in structure"); 7128 } 7129 } 7130 7131 if (qual->flags.q.explicit_binding) { 7132 _mesa_glsl_error(&loc, state, 7133 "binding layout qualifier cannot be applied " 7134 "to struct or interface block members"); 7135 } 7136 7137 if (is_interface) { 7138 if (!first_member) { 7139 if (!layout->flags.q.explicit_location && 7140 ((first_member_has_explicit_location && 7141 !qual->flags.q.explicit_location) || 7142 (!first_member_has_explicit_location && 7143 qual->flags.q.explicit_location))) { 7144 _mesa_glsl_error(&loc, state, 7145 "when block-level location layout qualifier " 7146 "is not supplied either all members must " 7147 "have a location layout qualifier or all " 7148 "members must not have a location layout " 7149 "qualifier"); 7150 } 7151 } else { 7152 first_member = false; 7153 first_member_has_explicit_location = 7154 qual->flags.q.explicit_location; 7155 } 7156 } 7157 7158 if (qual->flags.q.std140 || 7159 qual->flags.q.std430 || 7160 qual->flags.q.packed || 7161 qual->flags.q.shared) { 7162 _mesa_glsl_error(&loc, state, 7163 "uniform/shader storage block layout qualifiers " 7164 "std140, std430, packed, and shared can only be " 7165 "applied to uniform/shader storage blocks, not " 7166 "members"); 7167 } 7168 7169 if (qual->flags.q.constant) { 7170 _mesa_glsl_error(&loc, state, 7171 "const storage qualifier cannot be applied " 7172 "to struct or interface block members"); 7173 } 7174 7175 validate_memory_qualifier_for_type(state, &loc, qual, decl_type); 7176 validate_image_format_qualifier_for_type(state, &loc, qual, decl_type); 7177 7178 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec: 7179 * 7180 * "A block member may be declared with a stream identifier, but 7181 * the specified stream must match the stream associated with the 7182 * containing block." 7183 */ 7184 if (qual->flags.q.explicit_stream) { 7185 unsigned qual_stream; 7186 if (process_qualifier_constant(state, &loc, "stream", 7187 qual->stream, &qual_stream) && 7188 qual_stream != block_stream) { 7189 _mesa_glsl_error(&loc, state, "stream layout qualifier on " 7190 "interface block member does not match " 7191 "the interface block (%u vs %u)", qual_stream, 7192 block_stream); 7193 } 7194 } 7195 7196 int xfb_buffer; 7197 unsigned explicit_xfb_buffer = 0; 7198 if (qual->flags.q.explicit_xfb_buffer) { 7199 unsigned qual_xfb_buffer; 7200 if (process_qualifier_constant(state, &loc, "xfb_buffer", 7201 qual->xfb_buffer, &qual_xfb_buffer)) { 7202 explicit_xfb_buffer = 1; 7203 if (qual_xfb_buffer != block_xfb_buffer) 7204 _mesa_glsl_error(&loc, state, "xfb_buffer layout qualifier on " 7205 "interface block member does not match " 7206 "the interface block (%u vs %u)", 7207 qual_xfb_buffer, block_xfb_buffer); 7208 } 7209 xfb_buffer = (int) qual_xfb_buffer; 7210 } else { 7211 if (layout) 7212 explicit_xfb_buffer = layout->flags.q.explicit_xfb_buffer; 7213 xfb_buffer = (int) block_xfb_buffer; 7214 } 7215 7216 int xfb_stride = -1; 7217 if (qual->flags.q.explicit_xfb_stride) { 7218 unsigned qual_xfb_stride; 7219 if (process_qualifier_constant(state, &loc, "xfb_stride", 7220 qual->xfb_stride, &qual_xfb_stride)) { 7221 xfb_stride = (int) qual_xfb_stride; 7222 } 7223 } 7224 7225 if (qual->flags.q.uniform && qual->has_interpolation()) { 7226 _mesa_glsl_error(&loc, state, 7227 "interpolation qualifiers cannot be used " 7228 "with uniform interface blocks"); 7229 } 7230 7231 if ((qual->flags.q.uniform || !is_interface) && 7232 qual->has_auxiliary_storage()) { 7233 _mesa_glsl_error(&loc, state, 7234 "auxiliary storage qualifiers cannot be used " 7235 "in uniform blocks or structures."); 7236 } 7237 7238 if (qual->flags.q.row_major || qual->flags.q.column_major) { 7239 if (!qual->flags.q.uniform && !qual->flags.q.buffer) { 7240 _mesa_glsl_error(&loc, state, 7241 "row_major and column_major can only be " 7242 "applied to interface blocks"); 7243 } else 7244 validate_matrix_layout_for_type(state, &loc, decl_type, NULL); 7245 } 7246 7247 foreach_list_typed (ast_declaration, decl, link, 7248 &decl_list->declarations) { 7249 YYLTYPE loc = decl->get_location(); 7250 7251 if (!allow_reserved_names) 7252 validate_identifier(decl->identifier, loc, state); 7253 7254 const struct glsl_type *field_type = 7255 process_array_type(&loc, decl_type, decl->array_specifier, state); 7256 validate_array_dimensions(field_type, state, &loc); 7257 fields[i].type = field_type; 7258 fields[i].name = decl->identifier; 7259 fields[i].interpolation = 7260 interpret_interpolation_qualifier(qual, field_type, 7261 var_mode, state, &loc); 7262 fields[i].centroid = qual->flags.q.centroid ? 1 : 0; 7263 fields[i].sample = qual->flags.q.sample ? 1 : 0; 7264 fields[i].patch = qual->flags.q.patch ? 1 : 0; 7265 fields[i].precision = qual->precision; 7266 fields[i].offset = -1; 7267 fields[i].explicit_xfb_buffer = explicit_xfb_buffer; 7268 fields[i].xfb_buffer = xfb_buffer; 7269 fields[i].xfb_stride = xfb_stride; 7270 7271 if (qual->flags.q.explicit_location) { 7272 unsigned qual_location; 7273 if (process_qualifier_constant(state, &loc, "location", 7274 qual->location, &qual_location)) { 7275 fields[i].location = qual_location + 7276 (fields[i].patch ? VARYING_SLOT_PATCH0 : VARYING_SLOT_VAR0); 7277 expl_location = fields[i].location + 7278 fields[i].type->count_attribute_slots(false); 7279 } 7280 } else { 7281 if (layout && layout->flags.q.explicit_location) { 7282 fields[i].location = expl_location; 7283 expl_location += fields[i].type->count_attribute_slots(false); 7284 } else { 7285 fields[i].location = -1; 7286 } 7287 } 7288 7289 /* Offset can only be used with std430 and std140 layouts an initial 7290 * value of 0 is used for error detection. 7291 */ 7292 unsigned align = 0; 7293 unsigned size = 0; 7294 if (layout) { 7295 bool row_major; 7296 if (qual->flags.q.row_major || 7297 matrix_layout == GLSL_MATRIX_LAYOUT_ROW_MAJOR) { 7298 row_major = true; 7299 } else { 7300 row_major = false; 7301 } 7302 7303 if(layout->flags.q.std140) { 7304 align = field_type->std140_base_alignment(row_major); 7305 size = field_type->std140_size(row_major); 7306 } else if (layout->flags.q.std430) { 7307 align = field_type->std430_base_alignment(row_major); 7308 size = field_type->std430_size(row_major); 7309 } 7310 } 7311 7312 if (qual->flags.q.explicit_offset) { 7313 unsigned qual_offset; 7314 if (process_qualifier_constant(state, &loc, "offset", 7315 qual->offset, &qual_offset)) { 7316 if (align != 0 && size != 0) { 7317 if (next_offset > qual_offset) 7318 _mesa_glsl_error(&loc, state, "layout qualifier " 7319 "offset overlaps previous member"); 7320 7321 if (qual_offset % align) { 7322 _mesa_glsl_error(&loc, state, "layout qualifier offset " 7323 "must be a multiple of the base " 7324 "alignment of %s", field_type->name); 7325 } 7326 fields[i].offset = qual_offset; 7327 next_offset = glsl_align(qual_offset + size, align); 7328 } else { 7329 _mesa_glsl_error(&loc, state, "offset can only be used " 7330 "with std430 and std140 layouts"); 7331 } 7332 } 7333 } 7334 7335 if (qual->flags.q.explicit_align || expl_align != 0) { 7336 unsigned offset = fields[i].offset != -1 ? fields[i].offset : 7337 next_offset; 7338 if (align == 0 || size == 0) { 7339 _mesa_glsl_error(&loc, state, "align can only be used with " 7340 "std430 and std140 layouts"); 7341 } else if (qual->flags.q.explicit_align) { 7342 unsigned member_align; 7343 if (process_qualifier_constant(state, &loc, "align", 7344 qual->align, &member_align)) { 7345 if (member_align == 0 || 7346 member_align & (member_align - 1)) { 7347 _mesa_glsl_error(&loc, state, "align layout qualifier " 7348 "in not a power of 2"); 7349 } else { 7350 fields[i].offset = glsl_align(offset, member_align); 7351 next_offset = glsl_align(fields[i].offset + size, align); 7352 } 7353 } 7354 } else { 7355 fields[i].offset = glsl_align(offset, expl_align); 7356 next_offset = glsl_align(fields[i].offset + size, align); 7357 } 7358 } else if (!qual->flags.q.explicit_offset) { 7359 if (align != 0 && size != 0) 7360 next_offset = glsl_align(next_offset + size, align); 7361 } 7362 7363 /* From the ARB_enhanced_layouts spec: 7364 * 7365 * "The given offset applies to the first component of the first 7366 * member of the qualified entity. Then, within the qualified 7367 * entity, subsequent components are each assigned, in order, to 7368 * the next available offset aligned to a multiple of that 7369 * component's size. Aggregate types are flattened down to the 7370 * component level to get this sequence of components." 7371 */ 7372 if (qual->flags.q.explicit_xfb_offset) { 7373 unsigned xfb_offset; 7374 if (process_qualifier_constant(state, &loc, "xfb_offset", 7375 qual->offset, &xfb_offset)) { 7376 fields[i].offset = xfb_offset; 7377 block_xfb_offset = fields[i].offset + 7378 4 * field_type->component_slots(); 7379 } 7380 } else { 7381 if (layout && layout->flags.q.explicit_xfb_offset) { 7382 unsigned align = field_type->is_64bit() ? 8 : 4; 7383 fields[i].offset = glsl_align(block_xfb_offset, align); 7384 block_xfb_offset += 4 * field_type->component_slots(); 7385 } 7386 } 7387 7388 /* Propogate row- / column-major information down the fields of the 7389 * structure or interface block. Structures need this data because 7390 * the structure may contain a structure that contains ... a matrix 7391 * that need the proper layout. 7392 */ 7393 if (is_interface && layout && 7394 (layout->flags.q.uniform || layout->flags.q.buffer) && 7395 (field_type->without_array()->is_matrix() 7396 || field_type->without_array()->is_record())) { 7397 /* If no layout is specified for the field, inherit the layout 7398 * from the block. 7399 */ 7400 fields[i].matrix_layout = matrix_layout; 7401 7402 if (qual->flags.q.row_major) 7403 fields[i].matrix_layout = GLSL_MATRIX_LAYOUT_ROW_MAJOR; 7404 else if (qual->flags.q.column_major) 7405 fields[i].matrix_layout = GLSL_MATRIX_LAYOUT_COLUMN_MAJOR; 7406 7407 /* If we're processing an uniform or buffer block, the matrix 7408 * layout must be decided by this point. 7409 */ 7410 assert(fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_ROW_MAJOR 7411 || fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_COLUMN_MAJOR); 7412 } 7413 7414 /* Memory qualifiers are allowed on buffer and image variables, while 7415 * the format qualifier is only accepted for images. 7416 */ 7417 if (var_mode == ir_var_shader_storage || 7418 field_type->without_array()->is_image()) { 7419 /* For readonly and writeonly qualifiers the field definition, 7420 * if set, overwrites the layout qualifier. 7421 */ 7422 if (qual->flags.q.read_only || qual->flags.q.write_only) { 7423 fields[i].memory_read_only = qual->flags.q.read_only; 7424 fields[i].memory_write_only = qual->flags.q.write_only; 7425 } else { 7426 fields[i].memory_read_only = 7427 layout ? layout->flags.q.read_only : 0; 7428 fields[i].memory_write_only = 7429 layout ? layout->flags.q.write_only : 0; 7430 } 7431 7432 /* For other qualifiers, we set the flag if either the layout 7433 * qualifier or the field qualifier are set 7434 */ 7435 fields[i].memory_coherent = qual->flags.q.coherent || 7436 (layout && layout->flags.q.coherent); 7437 fields[i].memory_volatile = qual->flags.q._volatile || 7438 (layout && layout->flags.q._volatile); 7439 fields[i].memory_restrict = qual->flags.q.restrict_flag || 7440 (layout && layout->flags.q.restrict_flag); 7441 7442 if (field_type->without_array()->is_image()) { 7443 if (qual->flags.q.explicit_image_format) { 7444 if (qual->image_base_type != 7445 field_type->without_array()->sampled_type) { 7446 _mesa_glsl_error(&loc, state, "format qualifier doesn't " 7447 "match the base data type of the image"); 7448 } 7449 7450 fields[i].image_format = qual->image_format; 7451 } else { 7452 if (!qual->flags.q.write_only) { 7453 _mesa_glsl_error(&loc, state, "image not qualified with " 7454 "`writeonly' must have a format layout " 7455 "qualifier"); 7456 } 7457 7458 fields[i].image_format = GL_NONE; 7459 } 7460 } 7461 } 7462 7463 i++; 7464 } 7465 } 7466 7467 assert(i == decl_count); 7468 7469 *fields_ret = fields; 7470 return decl_count; 7471 } 7472 7473 7474 ir_rvalue * 7475 ast_struct_specifier::hir(exec_list *instructions, 7476 struct _mesa_glsl_parse_state *state) 7477 { 7478 YYLTYPE loc = this->get_location(); 7479 7480 unsigned expl_location = 0; 7481 if (layout && layout->flags.q.explicit_location) { 7482 if (!process_qualifier_constant(state, &loc, "location", 7483 layout->location, &expl_location)) { 7484 return NULL; 7485 } else { 7486 expl_location = VARYING_SLOT_VAR0 + expl_location; 7487 } 7488 } 7489 7490 glsl_struct_field *fields; 7491 unsigned decl_count = 7492 ast_process_struct_or_iface_block_members(instructions, 7493 state, 7494 &this->declarations, 7495 &fields, 7496 false, 7497 GLSL_MATRIX_LAYOUT_INHERITED, 7498 false /* allow_reserved_names */, 7499 ir_var_auto, 7500 layout, 7501 0, /* for interface only */ 7502 0, /* for interface only */ 7503 0, /* for interface only */ 7504 expl_location, 7505 0 /* for interface only */); 7506 7507 validate_identifier(this->name, loc, state); 7508 7509 type = glsl_type::get_record_instance(fields, decl_count, this->name); 7510 7511 if (!type->is_anonymous() && !state->symbols->add_type(name, type)) { 7512 const glsl_type *match = state->symbols->get_type(name); 7513 /* allow struct matching for desktop GL - older UE4 does this */ 7514 if (match != NULL && state->is_version(130, 0) && match->record_compare(type, false)) 7515 _mesa_glsl_warning(& loc, state, "struct `%s' previously defined", name); 7516 else 7517 _mesa_glsl_error(& loc, state, "struct `%s' previously defined", name); 7518 } else { 7519 const glsl_type **s = reralloc(state, state->user_structures, 7520 const glsl_type *, 7521 state->num_user_structures + 1); 7522 if (s != NULL) { 7523 s[state->num_user_structures] = type; 7524 state->user_structures = s; 7525 state->num_user_structures++; 7526 } 7527 } 7528 7529 /* Structure type definitions do not have r-values. 7530 */ 7531 return NULL; 7532 } 7533 7534 7535 /** 7536 * Visitor class which detects whether a given interface block has been used. 7537 */ 7538 class interface_block_usage_visitor : public ir_hierarchical_visitor 7539 { 7540 public: 7541 interface_block_usage_visitor(ir_variable_mode mode, const glsl_type *block) 7542 : mode(mode), block(block), found(false) 7543 { 7544 } 7545 7546 virtual ir_visitor_status visit(ir_dereference_variable *ir) 7547 { 7548 if (ir->var->data.mode == mode && ir->var->get_interface_type() == block) { 7549 found = true; 7550 return visit_stop; 7551 } 7552 return visit_continue; 7553 } 7554 7555 bool usage_found() const 7556 { 7557 return this->found; 7558 } 7559 7560 private: 7561 ir_variable_mode mode; 7562 const glsl_type *block; 7563 bool found; 7564 }; 7565 7566 static bool 7567 is_unsized_array_last_element(ir_variable *v) 7568 { 7569 const glsl_type *interface_type = v->get_interface_type(); 7570 int length = interface_type->length; 7571 7572 assert(v->type->is_unsized_array()); 7573 7574 /* Check if it is the last element of the interface */ 7575 if (strcmp(interface_type->fields.structure[length-1].name, v->name) == 0) 7576 return true; 7577 return false; 7578 } 7579 7580 static void 7581 apply_memory_qualifiers(ir_variable *var, glsl_struct_field field) 7582 { 7583 var->data.memory_read_only = field.memory_read_only; 7584 var->data.memory_write_only = field.memory_write_only; 7585 var->data.memory_coherent = field.memory_coherent; 7586 var->data.memory_volatile = field.memory_volatile; 7587 var->data.memory_restrict = field.memory_restrict; 7588 } 7589 7590 ir_rvalue * 7591 ast_interface_block::hir(exec_list *instructions, 7592 struct _mesa_glsl_parse_state *state) 7593 { 7594 YYLTYPE loc = this->get_location(); 7595 7596 /* Interface blocks must be declared at global scope */ 7597 if (state->current_function != NULL) { 7598 _mesa_glsl_error(&loc, state, 7599 "Interface block `%s' must be declared " 7600 "at global scope", 7601 this->block_name); 7602 } 7603 7604 /* Validate qualifiers: 7605 * 7606 * - Layout Qualifiers as per the table in Section 4.4 7607 * ("Layout Qualifiers") of the GLSL 4.50 spec. 7608 * 7609 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the 7610 * GLSL 4.50 spec: 7611 * 7612 * "Additionally, memory qualifiers may also be used in the declaration 7613 * of shader storage blocks" 7614 * 7615 * Note the table in Section 4.4 says std430 is allowed on both uniform and 7616 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block 7617 * Layout Qualifiers) of the GLSL 4.50 spec says: 7618 * 7619 * "The std430 qualifier is supported only for shader storage blocks; 7620 * using std430 on a uniform block will result in a compile-time error." 7621 */ 7622 ast_type_qualifier allowed_blk_qualifiers; 7623 allowed_blk_qualifiers.flags.i = 0; 7624 if (this->layout.flags.q.buffer || this->layout.flags.q.uniform) { 7625 allowed_blk_qualifiers.flags.q.shared = 1; 7626 allowed_blk_qualifiers.flags.q.packed = 1; 7627 allowed_blk_qualifiers.flags.q.std140 = 1; 7628 allowed_blk_qualifiers.flags.q.row_major = 1; 7629 allowed_blk_qualifiers.flags.q.column_major = 1; 7630 allowed_blk_qualifiers.flags.q.explicit_align = 1; 7631 allowed_blk_qualifiers.flags.q.explicit_binding = 1; 7632 if (this->layout.flags.q.buffer) { 7633 allowed_blk_qualifiers.flags.q.buffer = 1; 7634 allowed_blk_qualifiers.flags.q.std430 = 1; 7635 allowed_blk_qualifiers.flags.q.coherent = 1; 7636 allowed_blk_qualifiers.flags.q._volatile = 1; 7637 allowed_blk_qualifiers.flags.q.restrict_flag = 1; 7638 allowed_blk_qualifiers.flags.q.read_only = 1; 7639 allowed_blk_qualifiers.flags.q.write_only = 1; 7640 } else { 7641 allowed_blk_qualifiers.flags.q.uniform = 1; 7642 } 7643 } else { 7644 /* Interface block */ 7645 assert(this->layout.flags.q.in || this->layout.flags.q.out); 7646 7647 allowed_blk_qualifiers.flags.q.explicit_location = 1; 7648 if (this->layout.flags.q.out) { 7649 allowed_blk_qualifiers.flags.q.out = 1; 7650 if (state->stage == MESA_SHADER_GEOMETRY || 7651 state->stage == MESA_SHADER_TESS_CTRL || 7652 state->stage == MESA_SHADER_TESS_EVAL || 7653 state->stage == MESA_SHADER_VERTEX ) { 7654 allowed_blk_qualifiers.flags.q.explicit_xfb_offset = 1; 7655 allowed_blk_qualifiers.flags.q.explicit_xfb_buffer = 1; 7656 allowed_blk_qualifiers.flags.q.xfb_buffer = 1; 7657 allowed_blk_qualifiers.flags.q.explicit_xfb_stride = 1; 7658 allowed_blk_qualifiers.flags.q.xfb_stride = 1; 7659 if (state->stage == MESA_SHADER_GEOMETRY) { 7660 allowed_blk_qualifiers.flags.q.stream = 1; 7661 allowed_blk_qualifiers.flags.q.explicit_stream = 1; 7662 } 7663 if (state->stage == MESA_SHADER_TESS_CTRL) { 7664 allowed_blk_qualifiers.flags.q.patch = 1; 7665 } 7666 } 7667 } else { 7668 allowed_blk_qualifiers.flags.q.in = 1; 7669 if (state->stage == MESA_SHADER_TESS_EVAL) { 7670 allowed_blk_qualifiers.flags.q.patch = 1; 7671 } 7672 } 7673 } 7674 7675 this->layout.validate_flags(&loc, state, allowed_blk_qualifiers, 7676 "invalid qualifier for block", 7677 this->block_name); 7678 7679 enum glsl_interface_packing packing; 7680 if (this->layout.flags.q.std140) { 7681 packing = GLSL_INTERFACE_PACKING_STD140; 7682 } else if (this->layout.flags.q.packed) { 7683 packing = GLSL_INTERFACE_PACKING_PACKED; 7684 } else if (this->layout.flags.q.std430) { 7685 packing = GLSL_INTERFACE_PACKING_STD430; 7686 } else { 7687 /* The default layout is shared. 7688 */ 7689 packing = GLSL_INTERFACE_PACKING_SHARED; 7690 } 7691 7692 ir_variable_mode var_mode; 7693 const char *iface_type_name; 7694 if (this->layout.flags.q.in) { 7695 var_mode = ir_var_shader_in; 7696 iface_type_name = "in"; 7697 } else if (this->layout.flags.q.out) { 7698 var_mode = ir_var_shader_out; 7699 iface_type_name = "out"; 7700 } else if (this->layout.flags.q.uniform) { 7701 var_mode = ir_var_uniform; 7702 iface_type_name = "uniform"; 7703 } else if (this->layout.flags.q.buffer) { 7704 var_mode = ir_var_shader_storage; 7705 iface_type_name = "buffer"; 7706 } else { 7707 var_mode = ir_var_auto; 7708 iface_type_name = "UNKNOWN"; 7709 assert(!"interface block layout qualifier not found!"); 7710 } 7711 7712 enum glsl_matrix_layout matrix_layout = GLSL_MATRIX_LAYOUT_INHERITED; 7713 if (this->layout.flags.q.row_major) 7714 matrix_layout = GLSL_MATRIX_LAYOUT_ROW_MAJOR; 7715 else if (this->layout.flags.q.column_major) 7716 matrix_layout = GLSL_MATRIX_LAYOUT_COLUMN_MAJOR; 7717 7718 bool redeclaring_per_vertex = strcmp(this->block_name, "gl_PerVertex") == 0; 7719 exec_list declared_variables; 7720 glsl_struct_field *fields; 7721 7722 /* For blocks that accept memory qualifiers (i.e. shader storage), verify 7723 * that we don't have incompatible qualifiers 7724 */ 7725 if (this->layout.flags.q.read_only && this->layout.flags.q.write_only) { 7726 _mesa_glsl_error(&loc, state, 7727 "Interface block sets both readonly and writeonly"); 7728 } 7729 7730 unsigned qual_stream; 7731 if (!process_qualifier_constant(state, &loc, "stream", this->layout.stream, 7732 &qual_stream) || 7733 !validate_stream_qualifier(&loc, state, qual_stream)) { 7734 /* If the stream qualifier is invalid it doesn't make sense to continue 7735 * on and try to compare stream layouts on member variables against it 7736 * so just return early. 7737 */ 7738 return NULL; 7739 } 7740 7741 unsigned qual_xfb_buffer; 7742 if (!process_qualifier_constant(state, &loc, "xfb_buffer", 7743 layout.xfb_buffer, &qual_xfb_buffer) || 7744 !validate_xfb_buffer_qualifier(&loc, state, qual_xfb_buffer)) { 7745 return NULL; 7746 } 7747 7748 unsigned qual_xfb_offset; 7749 if (layout.flags.q.explicit_xfb_offset) { 7750 if (!process_qualifier_constant(state, &loc, "xfb_offset", 7751 layout.offset, &qual_xfb_offset)) { 7752 return NULL; 7753 } 7754 } 7755 7756 unsigned qual_xfb_stride; 7757 if (layout.flags.q.explicit_xfb_stride) { 7758 if (!process_qualifier_constant(state, &loc, "xfb_stride", 7759 layout.xfb_stride, &qual_xfb_stride)) { 7760 return NULL; 7761 } 7762 } 7763 7764 unsigned expl_location = 0; 7765 if (layout.flags.q.explicit_location) { 7766 if (!process_qualifier_constant(state, &loc, "location", 7767 layout.location, &expl_location)) { 7768 return NULL; 7769 } else { 7770 expl_location += this->layout.flags.q.patch ? VARYING_SLOT_PATCH0 7771 : VARYING_SLOT_VAR0; 7772 } 7773 } 7774 7775 unsigned expl_align = 0; 7776 if (layout.flags.q.explicit_align) { 7777 if (!process_qualifier_constant(state, &loc, "align", 7778 layout.align, &expl_align)) { 7779 return NULL; 7780 } else { 7781 if (expl_align == 0 || expl_align & (expl_align - 1)) { 7782 _mesa_glsl_error(&loc, state, "align layout qualifier is not a " 7783 "power of 2."); 7784 return NULL; 7785 } 7786 } 7787 } 7788 7789 unsigned int num_variables = 7790 ast_process_struct_or_iface_block_members(&declared_variables, 7791 state, 7792 &this->declarations, 7793 &fields, 7794 true, 7795 matrix_layout, 7796 redeclaring_per_vertex, 7797 var_mode, 7798 &this->layout, 7799 qual_stream, 7800 qual_xfb_buffer, 7801 qual_xfb_offset, 7802 expl_location, 7803 expl_align); 7804 7805 if (!redeclaring_per_vertex) { 7806 validate_identifier(this->block_name, loc, state); 7807 7808 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec: 7809 * 7810 * "Block names have no other use within a shader beyond interface 7811 * matching; it is a compile-time error to use a block name at global 7812 * scope for anything other than as a block name." 7813 */ 7814 ir_variable *var = state->symbols->get_variable(this->block_name); 7815 if (var && !var->type->is_interface()) { 7816 _mesa_glsl_error(&loc, state, "Block name `%s' is " 7817 "already used in the scope.", 7818 this->block_name); 7819 } 7820 } 7821 7822 const glsl_type *earlier_per_vertex = NULL; 7823 if (redeclaring_per_vertex) { 7824 /* Find the previous declaration of gl_PerVertex. If we're redeclaring 7825 * the named interface block gl_in, we can find it by looking at the 7826 * previous declaration of gl_in. Otherwise we can find it by looking 7827 * at the previous decalartion of any of the built-in outputs, 7828 * e.g. gl_Position. 7829 * 7830 * Also check that the instance name and array-ness of the redeclaration 7831 * are correct. 7832 */ 7833 switch (var_mode) { 7834 case ir_var_shader_in: 7835 if (ir_variable *earlier_gl_in = 7836 state->symbols->get_variable("gl_in")) { 7837 earlier_per_vertex = earlier_gl_in->get_interface_type(); 7838 } else { 7839 _mesa_glsl_error(&loc, state, 7840 "redeclaration of gl_PerVertex input not allowed " 7841 "in the %s shader", 7842 _mesa_shader_stage_to_string(state->stage)); 7843 } 7844 if (this->instance_name == NULL || 7845 strcmp(this->instance_name, "gl_in") != 0 || this->array_specifier == NULL || 7846 !this->array_specifier->is_single_dimension()) { 7847 _mesa_glsl_error(&loc, state, 7848 "gl_PerVertex input must be redeclared as " 7849 "gl_in[]"); 7850 } 7851 break; 7852 case ir_var_shader_out: 7853 if (ir_variable *earlier_gl_Position = 7854 state->symbols->get_variable("gl_Position")) { 7855 earlier_per_vertex = earlier_gl_Position->get_interface_type(); 7856 } else if (ir_variable *earlier_gl_out = 7857 state->symbols->get_variable("gl_out")) { 7858 earlier_per_vertex = earlier_gl_out->get_interface_type(); 7859 } else { 7860 _mesa_glsl_error(&loc, state, 7861 "redeclaration of gl_PerVertex output not " 7862 "allowed in the %s shader", 7863 _mesa_shader_stage_to_string(state->stage)); 7864 } 7865 if (state->stage == MESA_SHADER_TESS_CTRL) { 7866 if (this->instance_name == NULL || 7867 strcmp(this->instance_name, "gl_out") != 0 || this->array_specifier == NULL) { 7868 _mesa_glsl_error(&loc, state, 7869 "gl_PerVertex output must be redeclared as " 7870 "gl_out[]"); 7871 } 7872 } else { 7873 if (this->instance_name != NULL) { 7874 _mesa_glsl_error(&loc, state, 7875 "gl_PerVertex output may not be redeclared with " 7876 "an instance name"); 7877 } 7878 } 7879 break; 7880 default: 7881 _mesa_glsl_error(&loc, state, 7882 "gl_PerVertex must be declared as an input or an " 7883 "output"); 7884 break; 7885 } 7886 7887 if (earlier_per_vertex == NULL) { 7888 /* An error has already been reported. Bail out to avoid null 7889 * dereferences later in this function. 7890 */ 7891 return NULL; 7892 } 7893 7894 /* Copy locations from the old gl_PerVertex interface block. */ 7895 for (unsigned i = 0; i < num_variables; i++) { 7896 int j = earlier_per_vertex->field_index(fields[i].name); 7897 if (j == -1) { 7898 _mesa_glsl_error(&loc, state, 7899 "redeclaration of gl_PerVertex must be a subset " 7900 "of the built-in members of gl_PerVertex"); 7901 } else { 7902 fields[i].location = 7903 earlier_per_vertex->fields.structure[j].location; 7904 fields[i].offset = 7905 earlier_per_vertex->fields.structure[j].offset; 7906 fields[i].interpolation = 7907 earlier_per_vertex->fields.structure[j].interpolation; 7908 fields[i].centroid = 7909 earlier_per_vertex->fields.structure[j].centroid; 7910 fields[i].sample = 7911 earlier_per_vertex->fields.structure[j].sample; 7912 fields[i].patch = 7913 earlier_per_vertex->fields.structure[j].patch; 7914 fields[i].precision = 7915 earlier_per_vertex->fields.structure[j].precision; 7916 fields[i].explicit_xfb_buffer = 7917 earlier_per_vertex->fields.structure[j].explicit_xfb_buffer; 7918 fields[i].xfb_buffer = 7919 earlier_per_vertex->fields.structure[j].xfb_buffer; 7920 fields[i].xfb_stride = 7921 earlier_per_vertex->fields.structure[j].xfb_stride; 7922 } 7923 } 7924 7925 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 7926 * spec: 7927 * 7928 * If a built-in interface block is redeclared, it must appear in 7929 * the shader before any use of any member included in the built-in 7930 * declaration, or a compilation error will result. 7931 * 7932 * This appears to be a clarification to the behaviour established for 7933 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour 7934 * regardless of GLSL version. 7935 */ 7936 interface_block_usage_visitor v(var_mode, earlier_per_vertex); 7937 v.run(instructions); 7938 if (v.usage_found()) { 7939 _mesa_glsl_error(&loc, state, 7940 "redeclaration of a built-in interface block must " 7941 "appear before any use of any member of the " 7942 "interface block"); 7943 } 7944 } 7945 7946 const glsl_type *block_type = 7947 glsl_type::get_interface_instance(fields, 7948 num_variables, 7949 packing, 7950 matrix_layout == 7951 GLSL_MATRIX_LAYOUT_ROW_MAJOR, 7952 this->block_name); 7953 7954 unsigned component_size = block_type->contains_double() ? 8 : 4; 7955 int xfb_offset = 7956 layout.flags.q.explicit_xfb_offset ? (int) qual_xfb_offset : -1; 7957 validate_xfb_offset_qualifier(&loc, state, xfb_offset, block_type, 7958 component_size); 7959 7960 if (!state->symbols->add_interface(block_type->name, block_type, var_mode)) { 7961 YYLTYPE loc = this->get_location(); 7962 _mesa_glsl_error(&loc, state, "interface block `%s' with type `%s' " 7963 "already taken in the current scope", 7964 this->block_name, iface_type_name); 7965 } 7966 7967 /* Since interface blocks cannot contain statements, it should be 7968 * impossible for the block to generate any instructions. 7969 */ 7970 assert(declared_variables.is_empty()); 7971 7972 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec: 7973 * 7974 * Geometry shader input variables get the per-vertex values written 7975 * out by vertex shader output variables of the same names. Since a 7976 * geometry shader operates on a set of vertices, each input varying 7977 * variable (or input block, see interface blocks below) needs to be 7978 * declared as an array. 7979 */ 7980 if (state->stage == MESA_SHADER_GEOMETRY && this->array_specifier == NULL && 7981 var_mode == ir_var_shader_in) { 7982 _mesa_glsl_error(&loc, state, "geometry shader inputs must be arrays"); 7983 } else if ((state->stage == MESA_SHADER_TESS_CTRL || 7984 state->stage == MESA_SHADER_TESS_EVAL) && 7985 !this->layout.flags.q.patch && 7986 this->array_specifier == NULL && 7987 var_mode == ir_var_shader_in) { 7988 _mesa_glsl_error(&loc, state, "per-vertex tessellation shader inputs must be arrays"); 7989 } else if (state->stage == MESA_SHADER_TESS_CTRL && 7990 !this->layout.flags.q.patch && 7991 this->array_specifier == NULL && 7992 var_mode == ir_var_shader_out) { 7993 _mesa_glsl_error(&loc, state, "tessellation control shader outputs must be arrays"); 7994 } 7995 7996 7997 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec 7998 * says: 7999 * 8000 * "If an instance name (instance-name) is used, then it puts all the 8001 * members inside a scope within its own name space, accessed with the 8002 * field selector ( . ) operator (analogously to structures)." 8003 */ 8004 if (this->instance_name) { 8005 if (redeclaring_per_vertex) { 8006 /* When a built-in in an unnamed interface block is redeclared, 8007 * get_variable_being_redeclared() calls 8008 * check_builtin_array_max_size() to make sure that built-in array 8009 * variables aren't redeclared to illegal sizes. But we're looking 8010 * at a redeclaration of a named built-in interface block. So we 8011 * have to manually call check_builtin_array_max_size() for all parts 8012 * of the interface that are arrays. 8013 */ 8014 for (unsigned i = 0; i < num_variables; i++) { 8015 if (fields[i].type->is_array()) { 8016 const unsigned size = fields[i].type->array_size(); 8017 check_builtin_array_max_size(fields[i].name, size, loc, state); 8018 } 8019 } 8020 } else { 8021 validate_identifier(this->instance_name, loc, state); 8022 } 8023 8024 ir_variable *var; 8025 8026 if (this->array_specifier != NULL) { 8027 const glsl_type *block_array_type = 8028 process_array_type(&loc, block_type, this->array_specifier, state); 8029 8030 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says: 8031 * 8032 * For uniform blocks declared an array, each individual array 8033 * element corresponds to a separate buffer object backing one 8034 * instance of the block. As the array size indicates the number 8035 * of buffer objects needed, uniform block array declarations 8036 * must specify an array size. 8037 * 8038 * And a few paragraphs later: 8039 * 8040 * Geometry shader input blocks must be declared as arrays and 8041 * follow the array declaration and linking rules for all 8042 * geometry shader inputs. All other input and output block 8043 * arrays must specify an array size. 8044 * 8045 * The same applies to tessellation shaders. 8046 * 8047 * The upshot of this is that the only circumstance where an 8048 * interface array size *doesn't* need to be specified is on a 8049 * geometry shader input, tessellation control shader input, 8050 * tessellation control shader output, and tessellation evaluation 8051 * shader input. 8052 */ 8053 if (block_array_type->is_unsized_array()) { 8054 bool allow_inputs = state->stage == MESA_SHADER_GEOMETRY || 8055 state->stage == MESA_SHADER_TESS_CTRL || 8056 state->stage == MESA_SHADER_TESS_EVAL; 8057 bool allow_outputs = state->stage == MESA_SHADER_TESS_CTRL; 8058 8059 if (this->layout.flags.q.in) { 8060 if (!allow_inputs) 8061 _mesa_glsl_error(&loc, state, 8062 "unsized input block arrays not allowed in " 8063 "%s shader", 8064 _mesa_shader_stage_to_string(state->stage)); 8065 } else if (this->layout.flags.q.out) { 8066 if (!allow_outputs) 8067 _mesa_glsl_error(&loc, state, 8068 "unsized output block arrays not allowed in " 8069 "%s shader", 8070 _mesa_shader_stage_to_string(state->stage)); 8071 } else { 8072 /* by elimination, this is a uniform block array */ 8073 _mesa_glsl_error(&loc, state, 8074 "unsized uniform block arrays not allowed in " 8075 "%s shader", 8076 _mesa_shader_stage_to_string(state->stage)); 8077 } 8078 } 8079 8080 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec: 8081 * 8082 * * Arrays of arrays of blocks are not allowed 8083 */ 8084 if (state->es_shader && block_array_type->is_array() && 8085 block_array_type->fields.array->is_array()) { 8086 _mesa_glsl_error(&loc, state, 8087 "arrays of arrays interface blocks are " 8088 "not allowed"); 8089 } 8090 8091 var = new(state) ir_variable(block_array_type, 8092 this->instance_name, 8093 var_mode); 8094 } else { 8095 var = new(state) ir_variable(block_type, 8096 this->instance_name, 8097 var_mode); 8098 } 8099 8100 var->data.matrix_layout = matrix_layout == GLSL_MATRIX_LAYOUT_INHERITED 8101 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR : matrix_layout; 8102 8103 if (var_mode == ir_var_shader_in || var_mode == ir_var_uniform) 8104 var->data.read_only = true; 8105 8106 var->data.patch = this->layout.flags.q.patch; 8107 8108 if (state->stage == MESA_SHADER_GEOMETRY && var_mode == ir_var_shader_in) 8109 handle_geometry_shader_input_decl(state, loc, var); 8110 else if ((state->stage == MESA_SHADER_TESS_CTRL || 8111 state->stage == MESA_SHADER_TESS_EVAL) && var_mode == ir_var_shader_in) 8112 handle_tess_shader_input_decl(state, loc, var); 8113 else if (state->stage == MESA_SHADER_TESS_CTRL && var_mode == ir_var_shader_out) 8114 handle_tess_ctrl_shader_output_decl(state, loc, var); 8115 8116 for (unsigned i = 0; i < num_variables; i++) { 8117 if (var->data.mode == ir_var_shader_storage) 8118 apply_memory_qualifiers(var, fields[i]); 8119 } 8120 8121 if (ir_variable *earlier = 8122 state->symbols->get_variable(this->instance_name)) { 8123 if (!redeclaring_per_vertex) { 8124 _mesa_glsl_error(&loc, state, "`%s' redeclared", 8125 this->instance_name); 8126 } 8127 earlier->data.how_declared = ir_var_declared_normally; 8128 earlier->type = var->type; 8129 earlier->reinit_interface_type(block_type); 8130 delete var; 8131 } else { 8132 if (this->layout.flags.q.explicit_binding) { 8133 apply_explicit_binding(state, &loc, var, var->type, 8134 &this->layout); 8135 } 8136 8137 var->data.stream = qual_stream; 8138 if (layout.flags.q.explicit_location) { 8139 var->data.location = expl_location; 8140 var->data.explicit_location = true; 8141 } 8142 8143 state->symbols->add_variable(var); 8144 instructions->push_tail(var); 8145 } 8146 } else { 8147 /* In order to have an array size, the block must also be declared with 8148 * an instance name. 8149 */ 8150 assert(this->array_specifier == NULL); 8151 8152 for (unsigned i = 0; i < num_variables; i++) { 8153 ir_variable *var = 8154 new(state) ir_variable(fields[i].type, 8155 ralloc_strdup(state, fields[i].name), 8156 var_mode); 8157 var->data.interpolation = fields[i].interpolation; 8158 var->data.centroid = fields[i].centroid; 8159 var->data.sample = fields[i].sample; 8160 var->data.patch = fields[i].patch; 8161 var->data.stream = qual_stream; 8162 var->data.location = fields[i].location; 8163 8164 if (fields[i].location != -1) 8165 var->data.explicit_location = true; 8166 8167 var->data.explicit_xfb_buffer = fields[i].explicit_xfb_buffer; 8168 var->data.xfb_buffer = fields[i].xfb_buffer; 8169 8170 if (fields[i].offset != -1) 8171 var->data.explicit_xfb_offset = true; 8172 var->data.offset = fields[i].offset; 8173 8174 var->init_interface_type(block_type); 8175 8176 if (var_mode == ir_var_shader_in || var_mode == ir_var_uniform) 8177 var->data.read_only = true; 8178 8179 /* Precision qualifiers do not have any meaning in Desktop GLSL */ 8180 if (state->es_shader) { 8181 var->data.precision = 8182 select_gles_precision(fields[i].precision, fields[i].type, 8183 state, &loc); 8184 } 8185 8186 if (fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_INHERITED) { 8187 var->data.matrix_layout = matrix_layout == GLSL_MATRIX_LAYOUT_INHERITED 8188 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR : matrix_layout; 8189 } else { 8190 var->data.matrix_layout = fields[i].matrix_layout; 8191 } 8192 8193 if (var->data.mode == ir_var_shader_storage) 8194 apply_memory_qualifiers(var, fields[i]); 8195 8196 /* Examine var name here since var may get deleted in the next call */ 8197 bool var_is_gl_id = is_gl_identifier(var->name); 8198 8199 if (redeclaring_per_vertex) { 8200 bool is_redeclaration; 8201 var = 8202 get_variable_being_redeclared(&var, loc, state, 8203 true /* allow_all_redeclarations */, 8204 &is_redeclaration); 8205 if (!var_is_gl_id || !is_redeclaration) { 8206 _mesa_glsl_error(&loc, state, 8207 "redeclaration of gl_PerVertex can only " 8208 "include built-in variables"); 8209 } else if (var->data.how_declared == ir_var_declared_normally) { 8210 _mesa_glsl_error(&loc, state, 8211 "`%s' has already been redeclared", 8212 var->name); 8213 } else { 8214 var->data.how_declared = ir_var_declared_in_block; 8215 var->reinit_interface_type(block_type); 8216 } 8217 continue; 8218 } 8219 8220 if (state->symbols->get_variable(var->name) != NULL) 8221 _mesa_glsl_error(&loc, state, "`%s' redeclared", var->name); 8222 8223 /* Propagate the "binding" keyword into this UBO/SSBO's fields. 8224 * The UBO declaration itself doesn't get an ir_variable unless it 8225 * has an instance name. This is ugly. 8226 */ 8227 if (this->layout.flags.q.explicit_binding) { 8228 apply_explicit_binding(state, &loc, var, 8229 var->get_interface_type(), &this->layout); 8230 } 8231 8232 if (var->type->is_unsized_array()) { 8233 if (var->is_in_shader_storage_block() && 8234 is_unsized_array_last_element(var)) { 8235 var->data.from_ssbo_unsized_array = true; 8236 } else { 8237 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays": 8238 * 8239 * "If an array is declared as the last member of a shader storage 8240 * block and the size is not specified at compile-time, it is 8241 * sized at run-time. In all other cases, arrays are sized only 8242 * at compile-time." 8243 * 8244 * In desktop GLSL it is allowed to have unsized-arrays that are 8245 * not last, as long as we can determine that they are implicitly 8246 * sized. 8247 */ 8248 if (state->es_shader) { 8249 _mesa_glsl_error(&loc, state, "unsized array `%s' " 8250 "definition: only last member of a shader " 8251 "storage block can be defined as unsized " 8252 "array", fields[i].name); 8253 } 8254 } 8255 } 8256 8257 state->symbols->add_variable(var); 8258 instructions->push_tail(var); 8259 } 8260 8261 if (redeclaring_per_vertex && block_type != earlier_per_vertex) { 8262 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec: 8263 * 8264 * It is also a compilation error ... to redeclare a built-in 8265 * block and then use a member from that built-in block that was 8266 * not included in the redeclaration. 8267 * 8268 * This appears to be a clarification to the behaviour established 8269 * for gl_PerVertex by GLSL 1.50, therefore we implement this 8270 * behaviour regardless of GLSL version. 8271 * 8272 * To prevent the shader from using a member that was not included in 8273 * the redeclaration, we disable any ir_variables that are still 8274 * associated with the old declaration of gl_PerVertex (since we've 8275 * already updated all of the variables contained in the new 8276 * gl_PerVertex to point to it). 8277 * 8278 * As a side effect this will prevent 8279 * validate_intrastage_interface_blocks() from getting confused and 8280 * thinking there are conflicting definitions of gl_PerVertex in the 8281 * shader. 8282 */ 8283 foreach_in_list_safe(ir_instruction, node, instructions) { 8284 ir_variable *const var = node->as_variable(); 8285 if (var != NULL && 8286 var->get_interface_type() == earlier_per_vertex && 8287 var->data.mode == var_mode) { 8288 if (var->data.how_declared == ir_var_declared_normally) { 8289 _mesa_glsl_error(&loc, state, 8290 "redeclaration of gl_PerVertex cannot " 8291 "follow a redeclaration of `%s'", 8292 var->name); 8293 } 8294 state->symbols->disable_variable(var->name); 8295 var->remove(); 8296 } 8297 } 8298 } 8299 } 8300 8301 return NULL; 8302 } 8303 8304 8305 ir_rvalue * 8306 ast_tcs_output_layout::hir(exec_list *instructions, 8307 struct _mesa_glsl_parse_state *state) 8308 { 8309 YYLTYPE loc = this->get_location(); 8310 8311 unsigned num_vertices; 8312 if (!state->out_qualifier->vertices-> 8313 process_qualifier_constant(state, "vertices", &num_vertices, 8314 false)) { 8315 /* return here to stop cascading incorrect error messages */ 8316 return NULL; 8317 } 8318 8319 /* If any shader outputs occurred before this declaration and specified an 8320 * array size, make sure the size they specified is consistent with the 8321 * primitive type. 8322 */ 8323 if (state->tcs_output_size != 0 && state->tcs_output_size != num_vertices) { 8324 _mesa_glsl_error(&loc, state, 8325 "this tessellation control shader output layout " 8326 "specifies %u vertices, but a previous output " 8327 "is declared with size %u", 8328 num_vertices, state->tcs_output_size); 8329 return NULL; 8330 } 8331 8332 state->tcs_output_vertices_specified = true; 8333 8334 /* If any shader outputs occurred before this declaration and did not 8335 * specify an array size, their size is determined now. 8336 */ 8337 foreach_in_list (ir_instruction, node, instructions) { 8338 ir_variable *var = node->as_variable(); 8339 if (var == NULL || var->data.mode != ir_var_shader_out) 8340 continue; 8341 8342 /* Note: Not all tessellation control shader output are arrays. */ 8343 if (!var->type->is_unsized_array() || var->data.patch) 8344 continue; 8345 8346 if (var->data.max_array_access >= (int)num_vertices) { 8347 _mesa_glsl_error(&loc, state, 8348 "this tessellation control shader output layout " 8349 "specifies %u vertices, but an access to element " 8350 "%u of output `%s' already exists", num_vertices, 8351 var->data.max_array_access, var->name); 8352 } else { 8353 var->type = glsl_type::get_array_instance(var->type->fields.array, 8354 num_vertices); 8355 } 8356 } 8357 8358 return NULL; 8359 } 8360 8361 8362 ir_rvalue * 8363 ast_gs_input_layout::hir(exec_list *instructions, 8364 struct _mesa_glsl_parse_state *state) 8365 { 8366 YYLTYPE loc = this->get_location(); 8367 8368 /* Should have been prevented by the parser. */ 8369 assert(!state->gs_input_prim_type_specified 8370 || state->in_qualifier->prim_type == this->prim_type); 8371 8372 /* If any shader inputs occurred before this declaration and specified an 8373 * array size, make sure the size they specified is consistent with the 8374 * primitive type. 8375 */ 8376 unsigned num_vertices = vertices_per_prim(this->prim_type); 8377 if (state->gs_input_size != 0 && state->gs_input_size != num_vertices) { 8378 _mesa_glsl_error(&loc, state, 8379 "this geometry shader input layout implies %u vertices" 8380 " per primitive, but a previous input is declared" 8381 " with size %u", num_vertices, state->gs_input_size); 8382 return NULL; 8383 } 8384 8385 state->gs_input_prim_type_specified = true; 8386 8387 /* If any shader inputs occurred before this declaration and did not 8388 * specify an array size, their size is determined now. 8389 */ 8390 foreach_in_list(ir_instruction, node, instructions) { 8391 ir_variable *var = node->as_variable(); 8392 if (var == NULL || var->data.mode != ir_var_shader_in) 8393 continue; 8394 8395 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an 8396 * array; skip it. 8397 */ 8398 8399 if (var->type->is_unsized_array()) { 8400 if (var->data.max_array_access >= (int)num_vertices) { 8401 _mesa_glsl_error(&loc, state, 8402 "this geometry shader input layout implies %u" 8403 " vertices, but an access to element %u of input" 8404 " `%s' already exists", num_vertices, 8405 var->data.max_array_access, var->name); 8406 } else { 8407 var->type = glsl_type::get_array_instance(var->type->fields.array, 8408 num_vertices); 8409 } 8410 } 8411 } 8412 8413 return NULL; 8414 } 8415 8416 8417 ir_rvalue * 8418 ast_cs_input_layout::hir(exec_list *instructions, 8419 struct _mesa_glsl_parse_state *state) 8420 { 8421 YYLTYPE loc = this->get_location(); 8422 8423 /* From the ARB_compute_shader specification: 8424 * 8425 * If the local size of the shader in any dimension is greater 8426 * than the maximum size supported by the implementation for that 8427 * dimension, a compile-time error results. 8428 * 8429 * It is not clear from the spec how the error should be reported if 8430 * the total size of the work group exceeds 8431 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to 8432 * report it at compile time as well. 8433 */ 8434 GLuint64 total_invocations = 1; 8435 unsigned qual_local_size[3]; 8436 for (int i = 0; i < 3; i++) { 8437 8438 char *local_size_str = ralloc_asprintf(NULL, "invalid local_size_%c", 8439 'x' + i); 8440 /* Infer a local_size of 1 for unspecified dimensions */ 8441 if (this->local_size[i] == NULL) { 8442 qual_local_size[i] = 1; 8443 } else if (!this->local_size[i]-> 8444 process_qualifier_constant(state, local_size_str, 8445 &qual_local_size[i], false)) { 8446 ralloc_free(local_size_str); 8447 return NULL; 8448 } 8449 ralloc_free(local_size_str); 8450 8451 if (qual_local_size[i] > state->ctx->Const.MaxComputeWorkGroupSize[i]) { 8452 _mesa_glsl_error(&loc, state, 8453 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE" 8454 " (%d)", 'x' + i, 8455 state->ctx->Const.MaxComputeWorkGroupSize[i]); 8456 break; 8457 } 8458 total_invocations *= qual_local_size[i]; 8459 if (total_invocations > 8460 state->ctx->Const.MaxComputeWorkGroupInvocations) { 8461 _mesa_glsl_error(&loc, state, 8462 "product of local_sizes exceeds " 8463 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)", 8464 state->ctx->Const.MaxComputeWorkGroupInvocations); 8465 break; 8466 } 8467 } 8468 8469 /* If any compute input layout declaration preceded this one, make sure it 8470 * was consistent with this one. 8471 */ 8472 if (state->cs_input_local_size_specified) { 8473 for (int i = 0; i < 3; i++) { 8474 if (state->cs_input_local_size[i] != qual_local_size[i]) { 8475 _mesa_glsl_error(&loc, state, 8476 "compute shader input layout does not match" 8477 " previous declaration"); 8478 return NULL; 8479 } 8480 } 8481 } 8482 8483 /* The ARB_compute_variable_group_size spec says: 8484 * 8485 * If a compute shader including a *local_size_variable* qualifier also 8486 * declares a fixed local group size using the *local_size_x*, 8487 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error 8488 * results 8489 */ 8490 if (state->cs_input_local_size_variable_specified) { 8491 _mesa_glsl_error(&loc, state, 8492 "compute shader can't include both a variable and a " 8493 "fixed local group size"); 8494 return NULL; 8495 } 8496 8497 state->cs_input_local_size_specified = true; 8498 for (int i = 0; i < 3; i++) 8499 state->cs_input_local_size[i] = qual_local_size[i]; 8500 8501 /* We may now declare the built-in constant gl_WorkGroupSize (see 8502 * builtin_variable_generator::generate_constants() for why we didn't 8503 * declare it earlier). 8504 */ 8505 ir_variable *var = new(state->symbols) 8506 ir_variable(glsl_type::uvec3_type, "gl_WorkGroupSize", ir_var_auto); 8507 var->data.how_declared = ir_var_declared_implicitly; 8508 var->data.read_only = true; 8509 instructions->push_tail(var); 8510 state->symbols->add_variable(var); 8511 ir_constant_data data; 8512 memset(&data, 0, sizeof(data)); 8513 for (int i = 0; i < 3; i++) 8514 data.u[i] = qual_local_size[i]; 8515 var->constant_value = new(var) ir_constant(glsl_type::uvec3_type, &data); 8516 var->constant_initializer = 8517 new(var) ir_constant(glsl_type::uvec3_type, &data); 8518 var->data.has_initializer = true; 8519 8520 return NULL; 8521 } 8522 8523 8524 static void 8525 detect_conflicting_assignments(struct _mesa_glsl_parse_state *state, 8526 exec_list *instructions) 8527 { 8528 bool gl_FragColor_assigned = false; 8529 bool gl_FragData_assigned = false; 8530 bool gl_FragSecondaryColor_assigned = false; 8531 bool gl_FragSecondaryData_assigned = false; 8532 bool user_defined_fs_output_assigned = false; 8533 ir_variable *user_defined_fs_output = NULL; 8534 8535 /* It would be nice to have proper location information. */ 8536 YYLTYPE loc; 8537 memset(&loc, 0, sizeof(loc)); 8538 8539 foreach_in_list(ir_instruction, node, instructions) { 8540 ir_variable *var = node->as_variable(); 8541 8542 if (!var || !var->data.assigned) 8543 continue; 8544 8545 if (strcmp(var->name, "gl_FragColor") == 0) 8546 gl_FragColor_assigned = true; 8547 else if (strcmp(var->name, "gl_FragData") == 0) 8548 gl_FragData_assigned = true; 8549 else if (strcmp(var->name, "gl_SecondaryFragColorEXT") == 0) 8550 gl_FragSecondaryColor_assigned = true; 8551 else if (strcmp(var->name, "gl_SecondaryFragDataEXT") == 0) 8552 gl_FragSecondaryData_assigned = true; 8553 else if (!is_gl_identifier(var->name)) { 8554 if (state->stage == MESA_SHADER_FRAGMENT && 8555 var->data.mode == ir_var_shader_out) { 8556 user_defined_fs_output_assigned = true; 8557 user_defined_fs_output = var; 8558 } 8559 } 8560 } 8561 8562 /* From the GLSL 1.30 spec: 8563 * 8564 * "If a shader statically assigns a value to gl_FragColor, it 8565 * may not assign a value to any element of gl_FragData. If a 8566 * shader statically writes a value to any element of 8567 * gl_FragData, it may not assign a value to 8568 * gl_FragColor. That is, a shader may assign values to either 8569 * gl_FragColor or gl_FragData, but not both. Multiple shaders 8570 * linked together must also consistently write just one of 8571 * these variables. Similarly, if user declared output 8572 * variables are in use (statically assigned to), then the 8573 * built-in variables gl_FragColor and gl_FragData may not be 8574 * assigned to. These incorrect usages all generate compile 8575 * time errors." 8576 */ 8577 if (gl_FragColor_assigned && gl_FragData_assigned) { 8578 _mesa_glsl_error(&loc, state, "fragment shader writes to both " 8579 "`gl_FragColor' and `gl_FragData'"); 8580 } else if (gl_FragColor_assigned && user_defined_fs_output_assigned) { 8581 _mesa_glsl_error(&loc, state, "fragment shader writes to both " 8582 "`gl_FragColor' and `%s'", 8583 user_defined_fs_output->name); 8584 } else if (gl_FragSecondaryColor_assigned && gl_FragSecondaryData_assigned) { 8585 _mesa_glsl_error(&loc, state, "fragment shader writes to both " 8586 "`gl_FragSecondaryColorEXT' and" 8587 " `gl_FragSecondaryDataEXT'"); 8588 } else if (gl_FragColor_assigned && gl_FragSecondaryData_assigned) { 8589 _mesa_glsl_error(&loc, state, "fragment shader writes to both " 8590 "`gl_FragColor' and" 8591 " `gl_FragSecondaryDataEXT'"); 8592 } else if (gl_FragData_assigned && gl_FragSecondaryColor_assigned) { 8593 _mesa_glsl_error(&loc, state, "fragment shader writes to both " 8594 "`gl_FragData' and" 8595 " `gl_FragSecondaryColorEXT'"); 8596 } else if (gl_FragData_assigned && user_defined_fs_output_assigned) { 8597 _mesa_glsl_error(&loc, state, "fragment shader writes to both " 8598 "`gl_FragData' and `%s'", 8599 user_defined_fs_output->name); 8600 } 8601 8602 if ((gl_FragSecondaryColor_assigned || gl_FragSecondaryData_assigned) && 8603 !state->EXT_blend_func_extended_enable) { 8604 _mesa_glsl_error(&loc, state, 8605 "Dual source blending requires EXT_blend_func_extended"); 8606 } 8607 } 8608 8609 8610 static void 8611 remove_per_vertex_blocks(exec_list *instructions, 8612 _mesa_glsl_parse_state *state, ir_variable_mode mode) 8613 { 8614 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode, 8615 * if it exists in this shader type. 8616 */ 8617 const glsl_type *per_vertex = NULL; 8618 switch (mode) { 8619 case ir_var_shader_in: 8620 if (ir_variable *gl_in = state->symbols->get_variable("gl_in")) 8621 per_vertex = gl_in->get_interface_type(); 8622 break; 8623 case ir_var_shader_out: 8624 if (ir_variable *gl_Position = 8625 state->symbols->get_variable("gl_Position")) { 8626 per_vertex = gl_Position->get_interface_type(); 8627 } 8628 break; 8629 default: 8630 assert(!"Unexpected mode"); 8631 break; 8632 } 8633 8634 /* If we didn't find a built-in gl_PerVertex interface block, then we don't 8635 * need to do anything. 8636 */ 8637 if (per_vertex == NULL) 8638 return; 8639 8640 /* If the interface block is used by the shader, then we don't need to do 8641 * anything. 8642 */ 8643 interface_block_usage_visitor v(mode, per_vertex); 8644 v.run(instructions); 8645 if (v.usage_found()) 8646 return; 8647 8648 /* Remove any ir_variable declarations that refer to the interface block 8649 * we're removing. 8650 */ 8651 foreach_in_list_safe(ir_instruction, node, instructions) { 8652 ir_variable *const var = node->as_variable(); 8653 if (var != NULL && var->get_interface_type() == per_vertex && 8654 var->data.mode == mode) { 8655 state->symbols->disable_variable(var->name); 8656 var->remove(); 8657 } 8658 } 8659 } 8660