2 * Copyright © 2010 Intel Corporation
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:
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
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.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
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.
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.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "glsl_symbol_table.h"
53 #include "glsl_parser_extras.h"
55 #include "glsl_types.h"
56 #include "program/hash_table.h"
58 #include "ir_builder.h"
60 using namespace ir_builder
;
63 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
64 exec_list
*instructions
);
66 remove_per_vertex_blocks(exec_list
*instructions
,
67 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
71 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
73 _mesa_glsl_initialize_variables(instructions
, state
);
75 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
77 state
->current_function
= NULL
;
79 state
->toplevel_ir
= instructions
;
81 state
->gs_input_prim_type_specified
= false;
82 state
->cs_input_local_size_specified
= false;
84 /* Section 4.2 of the GLSL 1.20 specification states:
85 * "The built-in functions are scoped in a scope outside the global scope
86 * users declare global variables in. That is, a shader's global scope,
87 * available for user-defined functions and global variables, is nested
88 * inside the scope containing the built-in functions."
90 * Since built-in functions like ftransform() access built-in variables,
91 * it follows that those must be in the outer scope as well.
93 * We push scope here to create this nesting effect...but don't pop.
94 * This way, a shader's globals are still in the symbol table for use
97 state
->symbols
->push_scope();
99 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
100 ast
->hir(instructions
, state
);
102 detect_recursion_unlinked(state
, instructions
);
103 detect_conflicting_assignments(state
, instructions
);
105 state
->toplevel_ir
= NULL
;
107 /* Move all of the variable declarations to the front of the IR list, and
108 * reverse the order. This has the (intended!) side effect that vertex
109 * shader inputs and fragment shader outputs will appear in the IR in the
110 * same order that they appeared in the shader code. This results in the
111 * locations being assigned in the declared order. Many (arguably buggy)
112 * applications depend on this behavior, and it matches what nearly all
115 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
116 ir_variable
*const var
= node
->as_variable();
122 instructions
->push_head(var
);
125 /* Figure out if gl_FragCoord is actually used in fragment shader */
126 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
128 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
130 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
132 * If multiple shaders using members of a built-in block belonging to
133 * the same interface are linked together in the same program, they
134 * must all redeclare the built-in block in the same way, as described
135 * in section 4.3.7 "Interface Blocks" for interface block matching, or
136 * a link error will result.
138 * The phrase "using members of a built-in block" implies that if two
139 * shaders are linked together and one of them *does not use* any members
140 * of the built-in block, then that shader does not need to have a matching
141 * redeclaration of the built-in block.
143 * This appears to be a clarification to the behaviour established for
144 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
147 * The definition of "interface" in section 4.3.7 that applies here is as
150 * The boundary between adjacent programmable pipeline stages: This
151 * spans all the outputs in all compilation units of the first stage
152 * and all the inputs in all compilation units of the second stage.
154 * Therefore this rule applies to both inter- and intra-stage linking.
156 * The easiest way to implement this is to check whether the shader uses
157 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
158 * remove all the relevant variable declaration from the IR, so that the
159 * linker won't see them and complain about mismatches.
161 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
162 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
166 static ir_expression_operation
167 get_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
168 struct _mesa_glsl_parse_state
*state
)
170 switch (to
->base_type
) {
171 case GLSL_TYPE_FLOAT
:
172 switch (from
->base_type
) {
173 case GLSL_TYPE_INT
: return ir_unop_i2f
;
174 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
175 default: return (ir_expression_operation
)0;
179 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
)
180 return (ir_expression_operation
)0;
181 switch (from
->base_type
) {
182 case GLSL_TYPE_INT
: return ir_unop_i2u
;
183 default: return (ir_expression_operation
)0;
186 default: return (ir_expression_operation
)0;
192 * If a conversion is available, convert one operand to a different type
194 * The \c from \c ir_rvalue is converted "in place".
196 * \param to Type that the operand it to be converted to
197 * \param from Operand that is being converted
198 * \param state GLSL compiler state
201 * If a conversion is possible (or unnecessary), \c true is returned.
202 * Otherwise \c false is returned.
205 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
206 struct _mesa_glsl_parse_state
*state
)
209 if (to
->base_type
== from
->type
->base_type
)
212 /* Prior to GLSL 1.20, there are no implicit conversions */
213 if (!state
->is_version(120, 0))
216 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
218 * "There are no implicit array or structure conversions. For
219 * example, an array of int cannot be implicitly converted to an
222 if (!to
->is_numeric() || !from
->type
->is_numeric())
225 /* We don't actually want the specific type `to`, we want a type
226 * with the same base type as `to`, but the same vector width as
229 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
230 from
->type
->matrix_columns
);
232 ir_expression_operation op
= get_conversion_operation(to
, from
->type
, state
);
234 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
242 static const struct glsl_type
*
243 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
245 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
247 const glsl_type
*type_a
= value_a
->type
;
248 const glsl_type
*type_b
= value_b
->type
;
250 /* From GLSL 1.50 spec, page 56:
252 * "The arithmetic binary operators add (+), subtract (-),
253 * multiply (*), and divide (/) operate on integer and
254 * floating-point scalars, vectors, and matrices."
256 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
257 _mesa_glsl_error(loc
, state
,
258 "operands to arithmetic operators must be numeric");
259 return glsl_type::error_type
;
263 /* "If one operand is floating-point based and the other is
264 * not, then the conversions from Section 4.1.10 "Implicit
265 * Conversions" are applied to the non-floating-point-based operand."
267 if (!apply_implicit_conversion(type_a
, value_b
, state
)
268 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
269 _mesa_glsl_error(loc
, state
,
270 "could not implicitly convert operands to "
271 "arithmetic operator");
272 return glsl_type::error_type
;
274 type_a
= value_a
->type
;
275 type_b
= value_b
->type
;
277 /* "If the operands are integer types, they must both be signed or
280 * From this rule and the preceeding conversion it can be inferred that
281 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
282 * The is_numeric check above already filtered out the case where either
283 * type is not one of these, so now the base types need only be tested for
286 if (type_a
->base_type
!= type_b
->base_type
) {
287 _mesa_glsl_error(loc
, state
,
288 "base type mismatch for arithmetic operator");
289 return glsl_type::error_type
;
292 /* "All arithmetic binary operators result in the same fundamental type
293 * (signed integer, unsigned integer, or floating-point) as the
294 * operands they operate on, after operand type conversion. After
295 * conversion, the following cases are valid
297 * * The two operands are scalars. In this case the operation is
298 * applied, resulting in a scalar."
300 if (type_a
->is_scalar() && type_b
->is_scalar())
303 /* "* One operand is a scalar, and the other is a vector or matrix.
304 * In this case, the scalar operation is applied independently to each
305 * component of the vector or matrix, resulting in the same size
308 if (type_a
->is_scalar()) {
309 if (!type_b
->is_scalar())
311 } else if (type_b
->is_scalar()) {
315 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
316 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
319 assert(!type_a
->is_scalar());
320 assert(!type_b
->is_scalar());
322 /* "* The two operands are vectors of the same size. In this case, the
323 * operation is done component-wise resulting in the same size
326 if (type_a
->is_vector() && type_b
->is_vector()) {
327 if (type_a
== type_b
) {
330 _mesa_glsl_error(loc
, state
,
331 "vector size mismatch for arithmetic operator");
332 return glsl_type::error_type
;
336 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
337 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
338 * <vector, vector> have been handled. At least one of the operands must
339 * be matrix. Further, since there are no integer matrix types, the base
340 * type of both operands must be float.
342 assert(type_a
->is_matrix() || type_b
->is_matrix());
343 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
344 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
346 /* "* The operator is add (+), subtract (-), or divide (/), and the
347 * operands are matrices with the same number of rows and the same
348 * number of columns. In this case, the operation is done component-
349 * wise resulting in the same size matrix."
350 * * The operator is multiply (*), where both operands are matrices or
351 * one operand is a vector and the other a matrix. A right vector
352 * operand is treated as a column vector and a left vector operand as a
353 * row vector. In all these cases, it is required that the number of
354 * columns of the left operand is equal to the number of rows of the
355 * right operand. Then, the multiply (*) operation does a linear
356 * algebraic multiply, yielding an object that has the same number of
357 * rows as the left operand and the same number of columns as the right
358 * operand. Section 5.10 "Vector and Matrix Operations" explains in
359 * more detail how vectors and matrices are operated on."
362 if (type_a
== type_b
)
365 if (type_a
->is_matrix() && type_b
->is_matrix()) {
366 /* Matrix multiply. The columns of A must match the rows of B. Given
367 * the other previously tested constraints, this means the vector type
368 * of a row from A must be the same as the vector type of a column from
371 if (type_a
->row_type() == type_b
->column_type()) {
372 /* The resulting matrix has the number of columns of matrix B and
373 * the number of rows of matrix A. We get the row count of A by
374 * looking at the size of a vector that makes up a column. The
375 * transpose (size of a row) is done for B.
377 const glsl_type
*const type
=
378 glsl_type::get_instance(type_a
->base_type
,
379 type_a
->column_type()->vector_elements
,
380 type_b
->row_type()->vector_elements
);
381 assert(type
!= glsl_type::error_type
);
385 } else if (type_a
->is_matrix()) {
386 /* A is a matrix and B is a column vector. Columns of A must match
387 * rows of B. Given the other previously tested constraints, this
388 * means the vector type of a row from A must be the same as the
389 * vector the type of B.
391 if (type_a
->row_type() == type_b
) {
392 /* The resulting vector has a number of elements equal to
393 * the number of rows of matrix A. */
394 const glsl_type
*const type
=
395 glsl_type::get_instance(type_a
->base_type
,
396 type_a
->column_type()->vector_elements
,
398 assert(type
!= glsl_type::error_type
);
403 assert(type_b
->is_matrix());
405 /* A is a row vector and B is a matrix. Columns of A must match rows
406 * of B. Given the other previously tested constraints, this means
407 * the type of A must be the same as the vector type of a column from
410 if (type_a
== type_b
->column_type()) {
411 /* The resulting vector has a number of elements equal to
412 * the number of columns of matrix B. */
413 const glsl_type
*const type
=
414 glsl_type::get_instance(type_a
->base_type
,
415 type_b
->row_type()->vector_elements
,
417 assert(type
!= glsl_type::error_type
);
423 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
424 return glsl_type::error_type
;
428 /* "All other cases are illegal."
430 _mesa_glsl_error(loc
, state
, "type mismatch");
431 return glsl_type::error_type
;
435 static const struct glsl_type
*
436 unary_arithmetic_result_type(const struct glsl_type
*type
,
437 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
439 /* From GLSL 1.50 spec, page 57:
441 * "The arithmetic unary operators negate (-), post- and pre-increment
442 * and decrement (-- and ++) operate on integer or floating-point
443 * values (including vectors and matrices). All unary operators work
444 * component-wise on their operands. These result with the same type
447 if (!type
->is_numeric()) {
448 _mesa_glsl_error(loc
, state
,
449 "operands to arithmetic operators must be numeric");
450 return glsl_type::error_type
;
457 * \brief Return the result type of a bit-logic operation.
459 * If the given types to the bit-logic operator are invalid, return
460 * glsl_type::error_type.
462 * \param type_a Type of LHS of bit-logic op
463 * \param type_b Type of RHS of bit-logic op
465 static const struct glsl_type
*
466 bit_logic_result_type(const struct glsl_type
*type_a
,
467 const struct glsl_type
*type_b
,
469 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
471 if (!state
->check_bitwise_operations_allowed(loc
)) {
472 return glsl_type::error_type
;
475 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
477 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
478 * (|). The operands must be of type signed or unsigned integers or
481 if (!type_a
->is_integer()) {
482 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
483 ast_expression::operator_string(op
));
484 return glsl_type::error_type
;
486 if (!type_b
->is_integer()) {
487 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
488 ast_expression::operator_string(op
));
489 return glsl_type::error_type
;
492 /* "The fundamental types of the operands (signed or unsigned) must
495 if (type_a
->base_type
!= type_b
->base_type
) {
496 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
497 "base type", ast_expression::operator_string(op
));
498 return glsl_type::error_type
;
501 /* "The operands cannot be vectors of differing size." */
502 if (type_a
->is_vector() &&
503 type_b
->is_vector() &&
504 type_a
->vector_elements
!= type_b
->vector_elements
) {
505 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
506 "different sizes", ast_expression::operator_string(op
));
507 return glsl_type::error_type
;
510 /* "If one operand is a scalar and the other a vector, the scalar is
511 * applied component-wise to the vector, resulting in the same type as
512 * the vector. The fundamental types of the operands [...] will be the
513 * resulting fundamental type."
515 if (type_a
->is_scalar())
521 static const struct glsl_type
*
522 modulus_result_type(const struct glsl_type
*type_a
,
523 const struct glsl_type
*type_b
,
524 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
526 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
527 return glsl_type::error_type
;
530 /* From GLSL 1.50 spec, page 56:
531 * "The operator modulus (%) operates on signed or unsigned integers or
532 * integer vectors. The operand types must both be signed or both be
535 if (!type_a
->is_integer()) {
536 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
537 return glsl_type::error_type
;
539 if (!type_b
->is_integer()) {
540 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
541 return glsl_type::error_type
;
543 if (type_a
->base_type
!= type_b
->base_type
) {
544 _mesa_glsl_error(loc
, state
,
545 "operands of %% must have the same base type");
546 return glsl_type::error_type
;
549 /* "The operands cannot be vectors of differing size. If one operand is
550 * a scalar and the other vector, then the scalar is applied component-
551 * wise to the vector, resulting in the same type as the vector. If both
552 * are vectors of the same size, the result is computed component-wise."
554 if (type_a
->is_vector()) {
555 if (!type_b
->is_vector()
556 || (type_a
->vector_elements
== type_b
->vector_elements
))
561 /* "The operator modulus (%) is not defined for any other data types
562 * (non-integer types)."
564 _mesa_glsl_error(loc
, state
, "type mismatch");
565 return glsl_type::error_type
;
569 static const struct glsl_type
*
570 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
571 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
573 const glsl_type
*type_a
= value_a
->type
;
574 const glsl_type
*type_b
= value_b
->type
;
576 /* From GLSL 1.50 spec, page 56:
577 * "The relational operators greater than (>), less than (<), greater
578 * than or equal (>=), and less than or equal (<=) operate only on
579 * scalar integer and scalar floating-point expressions."
581 if (!type_a
->is_numeric()
582 || !type_b
->is_numeric()
583 || !type_a
->is_scalar()
584 || !type_b
->is_scalar()) {
585 _mesa_glsl_error(loc
, state
,
586 "operands to relational operators must be scalar and "
588 return glsl_type::error_type
;
591 /* "Either the operands' types must match, or the conversions from
592 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
593 * operand, after which the types must match."
595 if (!apply_implicit_conversion(type_a
, value_b
, state
)
596 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
597 _mesa_glsl_error(loc
, state
,
598 "could not implicitly convert operands to "
599 "relational operator");
600 return glsl_type::error_type
;
602 type_a
= value_a
->type
;
603 type_b
= value_b
->type
;
605 if (type_a
->base_type
!= type_b
->base_type
) {
606 _mesa_glsl_error(loc
, state
, "base type mismatch");
607 return glsl_type::error_type
;
610 /* "The result is scalar Boolean."
612 return glsl_type::bool_type
;
616 * \brief Return the result type of a bit-shift operation.
618 * If the given types to the bit-shift operator are invalid, return
619 * glsl_type::error_type.
621 * \param type_a Type of LHS of bit-shift op
622 * \param type_b Type of RHS of bit-shift op
624 static const struct glsl_type
*
625 shift_result_type(const struct glsl_type
*type_a
,
626 const struct glsl_type
*type_b
,
628 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
630 if (!state
->check_bitwise_operations_allowed(loc
)) {
631 return glsl_type::error_type
;
634 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
636 * "The shift operators (<<) and (>>). For both operators, the operands
637 * must be signed or unsigned integers or integer vectors. One operand
638 * can be signed while the other is unsigned."
640 if (!type_a
->is_integer()) {
641 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
642 "integer vector", ast_expression::operator_string(op
));
643 return glsl_type::error_type
;
646 if (!type_b
->is_integer()) {
647 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
648 "integer vector", ast_expression::operator_string(op
));
649 return glsl_type::error_type
;
652 /* "If the first operand is a scalar, the second operand has to be
655 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
656 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
657 "second must be scalar as well",
658 ast_expression::operator_string(op
));
659 return glsl_type::error_type
;
662 /* If both operands are vectors, check that they have same number of
665 if (type_a
->is_vector() &&
666 type_b
->is_vector() &&
667 type_a
->vector_elements
!= type_b
->vector_elements
) {
668 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
669 "have same number of elements",
670 ast_expression::operator_string(op
));
671 return glsl_type::error_type
;
674 /* "In all cases, the resulting type will be the same type as the left
681 * Validates that a value can be assigned to a location with a specified type
683 * Validates that \c rhs can be assigned to some location. If the types are
684 * not an exact match but an automatic conversion is possible, \c rhs will be
688 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
689 * Otherwise the actual RHS to be assigned will be returned. This may be
690 * \c rhs, or it may be \c rhs after some type conversion.
693 * In addition to being used for assignments, this function is used to
694 * type-check return values.
697 validate_assignment(struct _mesa_glsl_parse_state
*state
,
698 YYLTYPE loc
, const glsl_type
*lhs_type
,
699 ir_rvalue
*rhs
, bool is_initializer
)
701 /* If there is already some error in the RHS, just return it. Anything
702 * else will lead to an avalanche of error message back to the user.
704 if (rhs
->type
->is_error())
707 /* If the types are identical, the assignment can trivially proceed.
709 if (rhs
->type
== lhs_type
)
712 /* If the array element types are the same and the LHS is unsized,
713 * the assignment is okay for initializers embedded in variable
716 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
717 * is handled by ir_dereference::is_lvalue.
719 if (lhs_type
->is_unsized_array() && rhs
->type
->is_array()
720 && (lhs_type
->element_type() == rhs
->type
->element_type())) {
721 if (is_initializer
) {
724 _mesa_glsl_error(&loc
, state
,
725 "implicitly sized arrays cannot be assigned");
730 /* Check for implicit conversion in GLSL 1.20 */
731 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
732 if (rhs
->type
== lhs_type
)
736 _mesa_glsl_error(&loc
, state
,
737 "%s of type %s cannot be assigned to "
738 "variable of type %s",
739 is_initializer
? "initializer" : "value",
740 rhs
->type
->name
, lhs_type
->name
);
746 mark_whole_array_access(ir_rvalue
*access
)
748 ir_dereference_variable
*deref
= access
->as_dereference_variable();
750 if (deref
&& deref
->var
) {
751 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
756 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
757 const char *non_lvalue_description
,
758 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
759 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
764 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
765 ir_rvalue
*extract_channel
= NULL
;
767 /* If the assignment LHS comes back as an ir_binop_vector_extract
768 * expression, move it to the RHS as an ir_triop_vector_insert.
770 if (lhs
->ir_type
== ir_type_expression
) {
771 ir_expression
*const lhs_expr
= lhs
->as_expression();
773 if (unlikely(lhs_expr
->operation
== ir_binop_vector_extract
)) {
775 validate_assignment(state
, lhs_loc
, lhs
->type
,
776 rhs
, is_initializer
);
778 if (new_rhs
== NULL
) {
782 * - LHS: (expression float vector_extract <vec> <channel>)
786 * - RHS: (expression vec2 vector_insert <vec> <channel> <scalar>)
788 * The LHS type is now a vector instead of a scalar. Since GLSL
789 * allows assignments to be used as rvalues, we need to re-extract
790 * the channel from assignment_temp when returning the rvalue.
792 extract_channel
= lhs_expr
->operands
[1];
793 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
794 lhs_expr
->operands
[0]->type
,
795 lhs_expr
->operands
[0],
798 lhs
= lhs_expr
->operands
[0]->clone(ctx
, NULL
);
803 ir_variable
*lhs_var
= lhs
->variable_referenced();
805 lhs_var
->data
.assigned
= true;
807 if (!error_emitted
) {
808 if (non_lvalue_description
!= NULL
) {
809 _mesa_glsl_error(&lhs_loc
, state
,
811 non_lvalue_description
);
812 error_emitted
= true;
813 } else if (lhs_var
!= NULL
&& lhs_var
->data
.read_only
) {
814 _mesa_glsl_error(&lhs_loc
, state
,
815 "assignment to read-only variable '%s'",
817 error_emitted
= true;
818 } else if (lhs
->type
->is_array() &&
819 !state
->check_version(120, 300, &lhs_loc
,
820 "whole array assignment forbidden")) {
821 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
823 * "Other binary or unary expressions, non-dereferenced
824 * arrays, function names, swizzles with repeated fields,
825 * and constants cannot be l-values."
827 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
829 error_emitted
= true;
830 } else if (!lhs
->is_lvalue()) {
831 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
832 error_emitted
= true;
837 validate_assignment(state
, lhs_loc
, lhs
->type
, rhs
, is_initializer
);
838 if (new_rhs
!= NULL
) {
841 /* If the LHS array was not declared with a size, it takes it size from
842 * the RHS. If the LHS is an l-value and a whole array, it must be a
843 * dereference of a variable. Any other case would require that the LHS
844 * is either not an l-value or not a whole array.
846 if (lhs
->type
->is_unsized_array()) {
847 ir_dereference
*const d
= lhs
->as_dereference();
851 ir_variable
*const var
= d
->variable_referenced();
855 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
856 /* FINISHME: This should actually log the location of the RHS. */
857 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
859 var
->data
.max_array_access
);
862 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
863 rhs
->type
->array_size());
866 if (lhs
->type
->is_array()) {
867 mark_whole_array_access(rhs
);
868 mark_whole_array_access(lhs
);
872 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
873 * but not post_inc) need the converted assigned value as an rvalue
874 * to handle things like:
879 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
881 instructions
->push_tail(var
);
882 instructions
->push_tail(assign(var
, rhs
));
884 if (!error_emitted
) {
885 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
886 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
888 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
890 if (extract_channel
) {
891 rvalue
= new(ctx
) ir_expression(ir_binop_vector_extract
,
893 extract_channel
->clone(ctx
, NULL
));
896 *out_rvalue
= rvalue
;
899 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
903 return error_emitted
;
907 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
909 void *ctx
= ralloc_parent(lvalue
);
912 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
914 instructions
->push_tail(var
);
916 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
919 return new(ctx
) ir_dereference_variable(var
);
924 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
933 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
934 struct _mesa_glsl_parse_state
*state
)
936 (void)hir(instructions
, state
);
940 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
941 struct _mesa_glsl_parse_state
*state
)
943 (void)hir(instructions
, state
);
947 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
950 ir_rvalue
*cmp
= NULL
;
952 if (operation
== ir_binop_all_equal
)
953 join_op
= ir_binop_logic_and
;
955 join_op
= ir_binop_logic_or
;
957 switch (op0
->type
->base_type
) {
958 case GLSL_TYPE_FLOAT
:
962 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
964 case GLSL_TYPE_ARRAY
: {
965 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
966 ir_rvalue
*e0
, *e1
, *result
;
968 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
969 new(mem_ctx
) ir_constant(i
));
970 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
971 new(mem_ctx
) ir_constant(i
));
972 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
975 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
981 mark_whole_array_access(op0
);
982 mark_whole_array_access(op1
);
986 case GLSL_TYPE_STRUCT
: {
987 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
988 ir_rvalue
*e0
, *e1
, *result
;
989 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
991 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
993 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
995 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
998 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1006 case GLSL_TYPE_ERROR
:
1007 case GLSL_TYPE_VOID
:
1008 case GLSL_TYPE_SAMPLER
:
1009 case GLSL_TYPE_IMAGE
:
1010 case GLSL_TYPE_INTERFACE
:
1011 case GLSL_TYPE_ATOMIC_UINT
:
1012 /* I assume a comparison of a struct containing a sampler just
1013 * ignores the sampler present in the type.
1019 cmp
= new(mem_ctx
) ir_constant(true);
1024 /* For logical operations, we want to ensure that the operands are
1025 * scalar booleans. If it isn't, emit an error and return a constant
1026 * boolean to avoid triggering cascading error messages.
1029 get_scalar_boolean_operand(exec_list
*instructions
,
1030 struct _mesa_glsl_parse_state
*state
,
1031 ast_expression
*parent_expr
,
1033 const char *operand_name
,
1034 bool *error_emitted
)
1036 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1038 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1040 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1043 if (!*error_emitted
) {
1044 YYLTYPE loc
= expr
->get_location();
1045 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1047 parent_expr
->operator_string(parent_expr
->oper
));
1048 *error_emitted
= true;
1051 return new(ctx
) ir_constant(true);
1055 * If name refers to a builtin array whose maximum allowed size is less than
1056 * size, report an error and return true. Otherwise return false.
1059 check_builtin_array_max_size(const char *name
, unsigned size
,
1060 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1062 if ((strcmp("gl_TexCoord", name
) == 0)
1063 && (size
> state
->Const
.MaxTextureCoords
)) {
1064 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1066 * "The size [of gl_TexCoord] can be at most
1067 * gl_MaxTextureCoords."
1069 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1070 "be larger than gl_MaxTextureCoords (%u)",
1071 state
->Const
.MaxTextureCoords
);
1072 } else if (strcmp("gl_ClipDistance", name
) == 0
1073 && size
> state
->Const
.MaxClipPlanes
) {
1074 /* From section 7.1 (Vertex Shader Special Variables) of the
1077 * "The gl_ClipDistance array is predeclared as unsized and
1078 * must be sized by the shader either redeclaring it with a
1079 * size or indexing it only with integral constant
1080 * expressions. ... The size can be at most
1081 * gl_MaxClipDistances."
1083 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1084 "be larger than gl_MaxClipDistances (%u)",
1085 state
->Const
.MaxClipPlanes
);
1090 * Create the constant 1, of a which is appropriate for incrementing and
1091 * decrementing values of the given GLSL type. For example, if type is vec4,
1092 * this creates a constant value of 1.0 having type float.
1094 * If the given type is invalid for increment and decrement operators, return
1095 * a floating point 1--the error will be detected later.
1098 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1100 switch (type
->base_type
) {
1101 case GLSL_TYPE_UINT
:
1102 return new(ctx
) ir_constant((unsigned) 1);
1104 return new(ctx
) ir_constant(1);
1106 case GLSL_TYPE_FLOAT
:
1107 return new(ctx
) ir_constant(1.0f
);
1112 ast_expression::hir(exec_list
*instructions
,
1113 struct _mesa_glsl_parse_state
*state
)
1115 return do_hir(instructions
, state
, true);
1119 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1120 struct _mesa_glsl_parse_state
*state
)
1122 do_hir(instructions
, state
, false);
1126 ast_expression::do_hir(exec_list
*instructions
,
1127 struct _mesa_glsl_parse_state
*state
,
1131 static const int operations
[AST_NUM_OPERATORS
] = {
1132 -1, /* ast_assign doesn't convert to ir_expression. */
1133 -1, /* ast_plus doesn't convert to ir_expression. */
1147 ir_binop_any_nequal
,
1157 /* Note: The following block of expression types actually convert
1158 * to multiple IR instructions.
1160 ir_binop_mul
, /* ast_mul_assign */
1161 ir_binop_div
, /* ast_div_assign */
1162 ir_binop_mod
, /* ast_mod_assign */
1163 ir_binop_add
, /* ast_add_assign */
1164 ir_binop_sub
, /* ast_sub_assign */
1165 ir_binop_lshift
, /* ast_ls_assign */
1166 ir_binop_rshift
, /* ast_rs_assign */
1167 ir_binop_bit_and
, /* ast_and_assign */
1168 ir_binop_bit_xor
, /* ast_xor_assign */
1169 ir_binop_bit_or
, /* ast_or_assign */
1171 -1, /* ast_conditional doesn't convert to ir_expression. */
1172 ir_binop_add
, /* ast_pre_inc. */
1173 ir_binop_sub
, /* ast_pre_dec. */
1174 ir_binop_add
, /* ast_post_inc. */
1175 ir_binop_sub
, /* ast_post_dec. */
1176 -1, /* ast_field_selection doesn't conv to ir_expression. */
1177 -1, /* ast_array_index doesn't convert to ir_expression. */
1178 -1, /* ast_function_call doesn't conv to ir_expression. */
1179 -1, /* ast_identifier doesn't convert to ir_expression. */
1180 -1, /* ast_int_constant doesn't convert to ir_expression. */
1181 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1182 -1, /* ast_float_constant doesn't conv to ir_expression. */
1183 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1184 -1, /* ast_sequence doesn't convert to ir_expression. */
1186 ir_rvalue
*result
= NULL
;
1188 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1189 bool error_emitted
= false;
1192 loc
= this->get_location();
1194 switch (this->oper
) {
1196 assert(!"ast_aggregate: Should never get here.");
1200 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1201 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1204 do_assignment(instructions
, state
,
1205 this->subexpressions
[0]->non_lvalue_description
,
1206 op
[0], op
[1], &result
, needs_rvalue
, false,
1207 this->subexpressions
[0]->get_location());
1212 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1214 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1216 error_emitted
= type
->is_error();
1222 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1224 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1226 error_emitted
= type
->is_error();
1228 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1236 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1237 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1239 type
= arithmetic_result_type(op
[0], op
[1],
1240 (this->oper
== ast_mul
),
1242 error_emitted
= type
->is_error();
1244 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1249 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1250 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1252 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1254 assert(operations
[this->oper
] == ir_binop_mod
);
1256 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1258 error_emitted
= type
->is_error();
1263 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1264 error_emitted
= true;
1267 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1268 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1269 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1271 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1273 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1280 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1281 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1283 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1285 /* The relational operators must either generate an error or result
1286 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1288 assert(type
->is_error()
1289 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1290 && type
->is_scalar()));
1292 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1294 error_emitted
= type
->is_error();
1299 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1300 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1302 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1304 * "The equality operators equal (==), and not equal (!=)
1305 * operate on all types. They result in a scalar Boolean. If
1306 * the operand types do not match, then there must be a
1307 * conversion from Section 4.1.10 "Implicit Conversions"
1308 * applied to one operand that can make them match, in which
1309 * case this conversion is done."
1311 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1312 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1313 || (op
[0]->type
!= op
[1]->type
)) {
1314 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1315 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1316 error_emitted
= true;
1317 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1318 !state
->check_version(120, 300, &loc
,
1319 "array comparisons forbidden")) {
1320 error_emitted
= true;
1321 } else if ((op
[0]->type
->contains_opaque() ||
1322 op
[1]->type
->contains_opaque())) {
1323 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1324 error_emitted
= true;
1327 if (error_emitted
) {
1328 result
= new(ctx
) ir_constant(false);
1330 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1331 assert(result
->type
== glsl_type::bool_type
);
1338 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1339 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1340 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1342 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1344 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1348 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1350 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1351 error_emitted
= true;
1354 if (!op
[0]->type
->is_integer()) {
1355 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1356 error_emitted
= true;
1359 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1360 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1363 case ast_logic_and
: {
1364 exec_list rhs_instructions
;
1365 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1366 "LHS", &error_emitted
);
1367 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1368 "RHS", &error_emitted
);
1370 if (rhs_instructions
.is_empty()) {
1371 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1372 type
= result
->type
;
1374 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1377 instructions
->push_tail(tmp
);
1379 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1380 instructions
->push_tail(stmt
);
1382 stmt
->then_instructions
.append_list(&rhs_instructions
);
1383 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1384 ir_assignment
*const then_assign
=
1385 new(ctx
) ir_assignment(then_deref
, op
[1]);
1386 stmt
->then_instructions
.push_tail(then_assign
);
1388 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1389 ir_assignment
*const else_assign
=
1390 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1391 stmt
->else_instructions
.push_tail(else_assign
);
1393 result
= new(ctx
) ir_dereference_variable(tmp
);
1399 case ast_logic_or
: {
1400 exec_list rhs_instructions
;
1401 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1402 "LHS", &error_emitted
);
1403 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1404 "RHS", &error_emitted
);
1406 if (rhs_instructions
.is_empty()) {
1407 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1408 type
= result
->type
;
1410 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1413 instructions
->push_tail(tmp
);
1415 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1416 instructions
->push_tail(stmt
);
1418 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1419 ir_assignment
*const then_assign
=
1420 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1421 stmt
->then_instructions
.push_tail(then_assign
);
1423 stmt
->else_instructions
.append_list(&rhs_instructions
);
1424 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1425 ir_assignment
*const else_assign
=
1426 new(ctx
) ir_assignment(else_deref
, op
[1]);
1427 stmt
->else_instructions
.push_tail(else_assign
);
1429 result
= new(ctx
) ir_dereference_variable(tmp
);
1436 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1438 * "The logical binary operators and (&&), or ( | | ), and
1439 * exclusive or (^^). They operate only on two Boolean
1440 * expressions and result in a Boolean expression."
1442 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1444 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1447 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1452 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1453 "operand", &error_emitted
);
1455 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1459 case ast_mul_assign
:
1460 case ast_div_assign
:
1461 case ast_add_assign
:
1462 case ast_sub_assign
: {
1463 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1464 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1466 type
= arithmetic_result_type(op
[0], op
[1],
1467 (this->oper
== ast_mul_assign
),
1470 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1474 do_assignment(instructions
, state
,
1475 this->subexpressions
[0]->non_lvalue_description
,
1476 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1477 &result
, needs_rvalue
, false,
1478 this->subexpressions
[0]->get_location());
1480 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1481 * explicitly test for this because none of the binary expression
1482 * operators allow array operands either.
1488 case ast_mod_assign
: {
1489 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1490 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1492 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1494 assert(operations
[this->oper
] == ir_binop_mod
);
1496 ir_rvalue
*temp_rhs
;
1497 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1501 do_assignment(instructions
, state
,
1502 this->subexpressions
[0]->non_lvalue_description
,
1503 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1504 &result
, needs_rvalue
, false,
1505 this->subexpressions
[0]->get_location());
1510 case ast_rs_assign
: {
1511 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1512 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1513 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1515 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1516 type
, op
[0], op
[1]);
1518 do_assignment(instructions
, state
,
1519 this->subexpressions
[0]->non_lvalue_description
,
1520 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1521 &result
, needs_rvalue
, false,
1522 this->subexpressions
[0]->get_location());
1526 case ast_and_assign
:
1527 case ast_xor_assign
:
1528 case ast_or_assign
: {
1529 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1530 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1531 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1533 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1534 type
, op
[0], op
[1]);
1536 do_assignment(instructions
, state
,
1537 this->subexpressions
[0]->non_lvalue_description
,
1538 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1539 &result
, needs_rvalue
, false,
1540 this->subexpressions
[0]->get_location());
1544 case ast_conditional
: {
1545 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1547 * "The ternary selection operator (?:). It operates on three
1548 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1549 * first expression, which must result in a scalar Boolean."
1551 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1552 "condition", &error_emitted
);
1554 /* The :? operator is implemented by generating an anonymous temporary
1555 * followed by an if-statement. The last instruction in each branch of
1556 * the if-statement assigns a value to the anonymous temporary. This
1557 * temporary is the r-value of the expression.
1559 exec_list then_instructions
;
1560 exec_list else_instructions
;
1562 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1563 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1565 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1567 * "The second and third expressions can be any type, as
1568 * long their types match, or there is a conversion in
1569 * Section 4.1.10 "Implicit Conversions" that can be applied
1570 * to one of the expressions to make their types match. This
1571 * resulting matching type is the type of the entire
1574 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1575 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1576 || (op
[1]->type
!= op
[2]->type
)) {
1577 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1579 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1580 "operator must have matching types");
1581 error_emitted
= true;
1582 type
= glsl_type::error_type
;
1587 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1589 * "The second and third expressions must be the same type, but can
1590 * be of any type other than an array."
1592 if (type
->is_array() &&
1593 !state
->check_version(120, 300, &loc
,
1594 "second and third operands of ?: operator "
1595 "cannot be arrays")) {
1596 error_emitted
= true;
1599 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1601 if (then_instructions
.is_empty()
1602 && else_instructions
.is_empty()
1603 && cond_val
!= NULL
) {
1604 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1606 ir_variable
*const tmp
=
1607 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1608 instructions
->push_tail(tmp
);
1610 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1611 instructions
->push_tail(stmt
);
1613 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1614 ir_dereference
*const then_deref
=
1615 new(ctx
) ir_dereference_variable(tmp
);
1616 ir_assignment
*const then_assign
=
1617 new(ctx
) ir_assignment(then_deref
, op
[1]);
1618 stmt
->then_instructions
.push_tail(then_assign
);
1620 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1621 ir_dereference
*const else_deref
=
1622 new(ctx
) ir_dereference_variable(tmp
);
1623 ir_assignment
*const else_assign
=
1624 new(ctx
) ir_assignment(else_deref
, op
[2]);
1625 stmt
->else_instructions
.push_tail(else_assign
);
1627 result
= new(ctx
) ir_dereference_variable(tmp
);
1634 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1635 ? "pre-increment operation" : "pre-decrement operation";
1637 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1638 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1640 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1642 ir_rvalue
*temp_rhs
;
1643 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1647 do_assignment(instructions
, state
,
1648 this->subexpressions
[0]->non_lvalue_description
,
1649 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1650 &result
, needs_rvalue
, false,
1651 this->subexpressions
[0]->get_location());
1656 case ast_post_dec
: {
1657 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1658 ? "post-increment operation" : "post-decrement operation";
1659 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1660 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1662 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1664 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1666 ir_rvalue
*temp_rhs
;
1667 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1670 /* Get a temporary of a copy of the lvalue before it's modified.
1671 * This may get thrown away later.
1673 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1675 ir_rvalue
*junk_rvalue
;
1677 do_assignment(instructions
, state
,
1678 this->subexpressions
[0]->non_lvalue_description
,
1679 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1680 &junk_rvalue
, false, false,
1681 this->subexpressions
[0]->get_location());
1686 case ast_field_selection
:
1687 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1690 case ast_array_index
: {
1691 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1693 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1694 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1696 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1699 if (result
->type
->is_error())
1700 error_emitted
= true;
1705 case ast_function_call
:
1706 /* Should *NEVER* get here. ast_function_call should always be handled
1707 * by ast_function_expression::hir.
1712 case ast_identifier
: {
1713 /* ast_identifier can appear several places in a full abstract syntax
1714 * tree. This particular use must be at location specified in the grammar
1715 * as 'variable_identifier'.
1718 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1721 var
->data
.used
= true;
1722 result
= new(ctx
) ir_dereference_variable(var
);
1724 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1725 this->primary_expression
.identifier
);
1727 result
= ir_rvalue::error_value(ctx
);
1728 error_emitted
= true;
1733 case ast_int_constant
:
1734 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1737 case ast_uint_constant
:
1738 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1741 case ast_float_constant
:
1742 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1745 case ast_bool_constant
:
1746 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1749 case ast_sequence
: {
1750 /* It should not be possible to generate a sequence in the AST without
1751 * any expressions in it.
1753 assert(!this->expressions
.is_empty());
1755 /* The r-value of a sequence is the last expression in the sequence. If
1756 * the other expressions in the sequence do not have side-effects (and
1757 * therefore add instructions to the instruction list), they get dropped
1760 exec_node
*previous_tail_pred
= NULL
;
1761 YYLTYPE previous_operand_loc
= loc
;
1763 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1764 /* If one of the operands of comma operator does not generate any
1765 * code, we want to emit a warning. At each pass through the loop
1766 * previous_tail_pred will point to the last instruction in the
1767 * stream *before* processing the previous operand. Naturally,
1768 * instructions->tail_pred will point to the last instruction in the
1769 * stream *after* processing the previous operand. If the two
1770 * pointers match, then the previous operand had no effect.
1772 * The warning behavior here differs slightly from GCC. GCC will
1773 * only emit a warning if none of the left-hand operands have an
1774 * effect. However, it will emit a warning for each. I believe that
1775 * there are some cases in C (especially with GCC extensions) where
1776 * it is useful to have an intermediate step in a sequence have no
1777 * effect, but I don't think these cases exist in GLSL. Either way,
1778 * it would be a giant hassle to replicate that behavior.
1780 if (previous_tail_pred
== instructions
->tail_pred
) {
1781 _mesa_glsl_warning(&previous_operand_loc
, state
,
1782 "left-hand operand of comma expression has "
1786 /* tail_pred is directly accessed instead of using the get_tail()
1787 * method for performance reasons. get_tail() has extra code to
1788 * return NULL when the list is empty. We don't care about that
1789 * here, so using tail_pred directly is fine.
1791 previous_tail_pred
= instructions
->tail_pred
;
1792 previous_operand_loc
= ast
->get_location();
1794 result
= ast
->hir(instructions
, state
);
1797 /* Any errors should have already been emitted in the loop above.
1799 error_emitted
= true;
1803 type
= NULL
; /* use result->type, not type. */
1804 assert(result
!= NULL
|| !needs_rvalue
);
1806 if (result
&& result
->type
->is_error() && !error_emitted
)
1807 _mesa_glsl_error(& loc
, state
, "type mismatch");
1814 ast_expression_statement::hir(exec_list
*instructions
,
1815 struct _mesa_glsl_parse_state
*state
)
1817 /* It is possible to have expression statements that don't have an
1818 * expression. This is the solitary semicolon:
1820 * for (i = 0; i < 5; i++)
1823 * In this case the expression will be NULL. Test for NULL and don't do
1824 * anything in that case.
1826 if (expression
!= NULL
)
1827 expression
->hir_no_rvalue(instructions
, state
);
1829 /* Statements do not have r-values.
1836 ast_compound_statement::hir(exec_list
*instructions
,
1837 struct _mesa_glsl_parse_state
*state
)
1840 state
->symbols
->push_scope();
1842 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1843 ast
->hir(instructions
, state
);
1846 state
->symbols
->pop_scope();
1848 /* Compound statements do not have r-values.
1854 * Evaluate the given exec_node (which should be an ast_node representing
1855 * a single array dimension) and return its integer value.
1858 process_array_size(exec_node
*node
,
1859 struct _mesa_glsl_parse_state
*state
)
1861 exec_list dummy_instructions
;
1863 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
1864 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1865 YYLTYPE loc
= array_size
->get_location();
1868 _mesa_glsl_error(& loc
, state
,
1869 "array size could not be resolved");
1873 if (!ir
->type
->is_integer()) {
1874 _mesa_glsl_error(& loc
, state
,
1875 "array size must be integer type");
1879 if (!ir
->type
->is_scalar()) {
1880 _mesa_glsl_error(& loc
, state
,
1881 "array size must be scalar type");
1885 ir_constant
*const size
= ir
->constant_expression_value();
1887 _mesa_glsl_error(& loc
, state
, "array size must be a "
1888 "constant valued expression");
1892 if (size
->value
.i
[0] <= 0) {
1893 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1897 assert(size
->type
== ir
->type
);
1899 /* If the array size is const (and we've verified that
1900 * it is) then no instructions should have been emitted
1901 * when we converted it to HIR. If they were emitted,
1902 * then either the array size isn't const after all, or
1903 * we are emitting unnecessary instructions.
1905 assert(dummy_instructions
.is_empty());
1907 return size
->value
.u
[0];
1910 static const glsl_type
*
1911 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
1912 ast_array_specifier
*array_specifier
,
1913 struct _mesa_glsl_parse_state
*state
)
1915 const glsl_type
*array_type
= base
;
1917 if (array_specifier
!= NULL
) {
1918 if (base
->is_array()) {
1920 /* From page 19 (page 25) of the GLSL 1.20 spec:
1922 * "Only one-dimensional arrays may be declared."
1924 if (!state
->ARB_arrays_of_arrays_enable
) {
1925 _mesa_glsl_error(loc
, state
,
1926 "invalid array of `%s'"
1927 "GL_ARB_arrays_of_arrays "
1928 "required for defining arrays of arrays",
1930 return glsl_type::error_type
;
1933 if (base
->length
== 0) {
1934 _mesa_glsl_error(loc
, state
,
1935 "only the outermost array dimension can "
1938 return glsl_type::error_type
;
1942 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
1943 !node
->is_head_sentinel(); node
= node
->prev
) {
1944 unsigned array_size
= process_array_size(node
, state
);
1945 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
1948 if (array_specifier
->is_unsized_array
)
1949 array_type
= glsl_type::get_array_instance(array_type
, 0);
1957 ast_type_specifier::glsl_type(const char **name
,
1958 struct _mesa_glsl_parse_state
*state
) const
1960 const struct glsl_type
*type
;
1962 type
= state
->symbols
->get_type(this->type_name
);
1963 *name
= this->type_name
;
1965 YYLTYPE loc
= this->get_location();
1966 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
1972 ast_fully_specified_type::glsl_type(const char **name
,
1973 struct _mesa_glsl_parse_state
*state
) const
1975 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
1980 if (type
->base_type
== GLSL_TYPE_FLOAT
1982 && state
->stage
== MESA_SHADER_FRAGMENT
1983 && this->qualifier
.precision
== ast_precision_none
1984 && state
->symbols
->get_variable("#default precision") == NULL
) {
1985 YYLTYPE loc
= this->get_location();
1986 _mesa_glsl_error(&loc
, state
,
1987 "no precision specified this scope for type `%s'",
1995 * Determine whether a toplevel variable declaration declares a varying. This
1996 * function operates by examining the variable's mode and the shader target,
1997 * so it correctly identifies linkage variables regardless of whether they are
1998 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2000 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2001 * this function will produce undefined results.
2004 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2007 case MESA_SHADER_VERTEX
:
2008 return var
->data
.mode
== ir_var_shader_out
;
2009 case MESA_SHADER_FRAGMENT
:
2010 return var
->data
.mode
== ir_var_shader_in
;
2012 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2018 * Matrix layout qualifiers are only allowed on certain types
2021 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2023 const glsl_type
*type
,
2026 if (var
&& !var
->is_in_uniform_block()) {
2027 /* Layout qualifiers may only apply to interface blocks and fields in
2030 _mesa_glsl_error(loc
, state
,
2031 "uniform block layout qualifiers row_major and "
2032 "column_major may not be applied to variables "
2033 "outside of uniform blocks");
2034 } else if (!type
->is_matrix()) {
2035 /* The OpenGL ES 3.0 conformance tests did not originally allow
2036 * matrix layout qualifiers on non-matrices. However, the OpenGL
2037 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2038 * amended to specifically allow these layouts on all types. Emit
2039 * a warning so that people know their code may not be portable.
2041 _mesa_glsl_warning(loc
, state
,
2042 "uniform block layout qualifiers row_major and "
2043 "column_major applied to non-matrix types may "
2044 "be rejected by older compilers");
2045 } else if (type
->is_record()) {
2046 /* We allow 'layout(row_major)' on structure types because it's the only
2047 * way to get row-major layouts on matrices contained in structures.
2049 _mesa_glsl_warning(loc
, state
,
2050 "uniform block layout qualifiers row_major and "
2051 "column_major applied to structure types is not "
2052 "strictly conformant and may be rejected by other "
2058 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
2061 const ast_type_qualifier
*qual
)
2063 if (var
->data
.mode
!= ir_var_uniform
) {
2064 _mesa_glsl_error(loc
, state
,
2065 "the \"binding\" qualifier only applies to uniforms");
2069 if (qual
->binding
< 0) {
2070 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
2074 const struct gl_context
*const ctx
= state
->ctx
;
2075 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
2076 unsigned max_index
= qual
->binding
+ elements
- 1;
2078 if (var
->type
->is_interface()) {
2079 /* UBOs. From page 60 of the GLSL 4.20 specification:
2080 * "If the binding point for any uniform block instance is less than zero,
2081 * or greater than or equal to the implementation-dependent maximum
2082 * number of uniform buffer bindings, a compilation error will occur.
2083 * When the binding identifier is used with a uniform block instanced as
2084 * an array of size N, all elements of the array from binding through
2085 * binding + N – 1 must be within this range."
2087 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2089 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2090 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
2091 "the maximum number of UBO binding points (%d)",
2092 qual
->binding
, elements
,
2093 ctx
->Const
.MaxUniformBufferBindings
);
2096 } else if (var
->type
->is_sampler() ||
2097 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
2098 /* Samplers. From page 63 of the GLSL 4.20 specification:
2099 * "If the binding is less than zero, or greater than or equal to the
2100 * implementation-dependent maximum supported number of units, a
2101 * compilation error will occur. When the binding identifier is used
2102 * with an array of size N, all elements of the array from binding
2103 * through binding + N - 1 must be within this range."
2105 unsigned limit
= ctx
->Const
.Program
[state
->stage
].MaxTextureImageUnits
;
2107 if (max_index
>= limit
) {
2108 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2109 "exceeds the maximum number of texture image units "
2110 "(%d)", qual
->binding
, elements
, limit
);
2114 } else if (var
->type
->contains_atomic()) {
2115 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2116 if (unsigned(qual
->binding
) >= ctx
->Const
.MaxAtomicBufferBindings
) {
2117 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2118 " maximum number of atomic counter buffer bindings"
2119 "(%d)", qual
->binding
,
2120 ctx
->Const
.MaxAtomicBufferBindings
);
2125 _mesa_glsl_error(loc
, state
,
2126 "the \"binding\" qualifier only applies to uniform "
2127 "blocks, samplers, atomic counters, or arrays thereof");
2135 static glsl_interp_qualifier
2136 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2137 ir_variable_mode mode
,
2138 struct _mesa_glsl_parse_state
*state
,
2141 glsl_interp_qualifier interpolation
;
2142 if (qual
->flags
.q
.flat
)
2143 interpolation
= INTERP_QUALIFIER_FLAT
;
2144 else if (qual
->flags
.q
.noperspective
)
2145 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2146 else if (qual
->flags
.q
.smooth
)
2147 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2149 interpolation
= INTERP_QUALIFIER_NONE
;
2151 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2152 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2153 _mesa_glsl_error(loc
, state
,
2154 "interpolation qualifier `%s' can only be applied to "
2155 "shader inputs or outputs.",
2156 interpolation_string(interpolation
));
2160 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2161 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2162 _mesa_glsl_error(loc
, state
,
2163 "interpolation qualifier `%s' cannot be applied to "
2164 "vertex shader inputs or fragment shader outputs",
2165 interpolation_string(interpolation
));
2169 return interpolation
;
2174 validate_explicit_location(const struct ast_type_qualifier
*qual
,
2176 struct _mesa_glsl_parse_state
*state
,
2181 /* Checks for GL_ARB_explicit_uniform_location. */
2182 if (qual
->flags
.q
.uniform
) {
2183 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2186 const struct gl_context
*const ctx
= state
->ctx
;
2187 unsigned max_loc
= qual
->location
+ var
->type
->uniform_locations() - 1;
2189 /* ARB_explicit_uniform_location specification states:
2191 * "The explicitly defined locations and the generated locations
2192 * must be in the range of 0 to MAX_UNIFORM_LOCATIONS minus one."
2194 * "Valid locations for default-block uniform variable locations
2195 * are in the range of 0 to the implementation-defined maximum
2196 * number of uniform locations."
2198 if (qual
->location
< 0) {
2199 _mesa_glsl_error(loc
, state
,
2200 "explicit location < 0 for uniform %s", var
->name
);
2204 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2205 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2206 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2207 ctx
->Const
.MaxUserAssignableUniformLocations
);
2211 var
->data
.explicit_location
= true;
2212 var
->data
.location
= qual
->location
;
2216 /* Between GL_ARB_explicit_attrib_location an
2217 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2218 * stage can be assigned explicit locations. The checking here associates
2219 * the correct extension with the correct stage's input / output:
2223 * vertex explicit_loc sso
2225 * fragment sso explicit_loc
2227 switch (state
->stage
) {
2228 case MESA_SHADER_VERTEX
:
2229 if (var
->data
.mode
== ir_var_shader_in
) {
2230 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2236 if (var
->data
.mode
== ir_var_shader_out
) {
2237 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2246 case MESA_SHADER_GEOMETRY
:
2247 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2248 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2257 case MESA_SHADER_FRAGMENT
:
2258 if (var
->data
.mode
== ir_var_shader_in
) {
2259 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2265 if (var
->data
.mode
== ir_var_shader_out
) {
2266 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2275 case MESA_SHADER_COMPUTE
:
2276 _mesa_glsl_error(loc
, state
,
2277 "compute shader variables cannot be given "
2278 "explicit locations");
2283 _mesa_glsl_error(loc
, state
,
2284 "%s cannot be given an explicit location in %s shader",
2286 _mesa_shader_stage_to_string(state
->stage
));
2288 var
->data
.explicit_location
= true;
2290 /* This bit of silliness is needed because invalid explicit locations
2291 * are supposed to be flagged during linking. Small negative values
2292 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2293 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2294 * The linker needs to be able to differentiate these cases. This
2295 * ensures that negative values stay negative.
2297 if (qual
->location
>= 0) {
2298 switch (state
->stage
) {
2299 case MESA_SHADER_VERTEX
:
2300 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2301 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2302 : (qual
->location
+ VARYING_SLOT_VAR0
);
2305 case MESA_SHADER_GEOMETRY
:
2306 var
->data
.location
= qual
->location
+ VARYING_SLOT_VAR0
;
2309 case MESA_SHADER_FRAGMENT
:
2310 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2311 ? (qual
->location
+ FRAG_RESULT_DATA0
)
2312 : (qual
->location
+ VARYING_SLOT_VAR0
);
2314 case MESA_SHADER_COMPUTE
:
2315 assert(!"Unexpected shader type");
2319 var
->data
.location
= qual
->location
;
2322 if (qual
->flags
.q
.explicit_index
) {
2323 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2324 * Layout Qualifiers):
2326 * "It is also a compile-time error if a fragment shader
2327 * sets a layout index to less than 0 or greater than 1."
2329 * Older specifications don't mandate a behavior; we take
2330 * this as a clarification and always generate the error.
2332 if (qual
->index
< 0 || qual
->index
> 1) {
2333 _mesa_glsl_error(loc
, state
,
2334 "explicit index may only be 0 or 1");
2336 var
->data
.explicit_index
= true;
2337 var
->data
.index
= qual
->index
;
2344 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2346 struct _mesa_glsl_parse_state
*state
,
2349 const glsl_type
*base_type
=
2350 (var
->type
->is_array() ? var
->type
->element_type() : var
->type
);
2352 if (base_type
->is_image()) {
2353 if (var
->data
.mode
!= ir_var_uniform
&&
2354 var
->data
.mode
!= ir_var_function_in
) {
2355 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2356 "function parameters or uniform-qualified "
2357 "global variables");
2360 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2361 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2362 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2363 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2364 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2365 var
->data
.read_only
= true;
2367 if (qual
->flags
.q
.explicit_image_format
) {
2368 if (var
->data
.mode
== ir_var_function_in
) {
2369 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2370 "used on image function parameters");
2373 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2374 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2375 "base data type of the image");
2378 var
->data
.image_format
= qual
->image_format
;
2380 if (var
->data
.mode
== ir_var_uniform
&& !qual
->flags
.q
.write_only
) {
2381 _mesa_glsl_error(loc
, state
, "uniforms not qualified with "
2382 "`writeonly' must have a format layout "
2386 var
->data
.image_format
= GL_NONE
;
2391 static inline const char*
2392 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
2394 if (origin_upper_left
&& pixel_center_integer
)
2395 return "origin_upper_left, pixel_center_integer";
2396 else if (origin_upper_left
)
2397 return "origin_upper_left";
2398 else if (pixel_center_integer
)
2399 return "pixel_center_integer";
2405 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
2406 const struct ast_type_qualifier
*qual
)
2408 /* If gl_FragCoord was previously declared, and the qualifiers were
2409 * different in any way, return true.
2411 if (state
->fs_redeclares_gl_fragcoord
) {
2412 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
2413 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
2420 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2422 struct _mesa_glsl_parse_state
*state
,
2426 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2428 if (qual
->flags
.q
.invariant
) {
2429 if (var
->data
.used
) {
2430 _mesa_glsl_error(loc
, state
,
2431 "variable `%s' may not be redeclared "
2432 "`invariant' after being used",
2435 var
->data
.invariant
= 1;
2439 if (qual
->flags
.q
.precise
) {
2440 if (var
->data
.used
) {
2441 _mesa_glsl_error(loc
, state
,
2442 "variable `%s' may not be redeclared "
2443 "`precise' after being used",
2446 var
->data
.precise
= 1;
2450 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2451 || qual
->flags
.q
.uniform
2452 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2453 var
->data
.read_only
= 1;
2455 if (qual
->flags
.q
.centroid
)
2456 var
->data
.centroid
= 1;
2458 if (qual
->flags
.q
.sample
)
2459 var
->data
.sample
= 1;
2461 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
2462 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
2463 var
->data
.stream
= qual
->stream
;
2466 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
2467 var
->type
= glsl_type::error_type
;
2468 _mesa_glsl_error(loc
, state
,
2469 "`attribute' variables may not be declared in the "
2471 _mesa_shader_stage_to_string(state
->stage
));
2474 /* Disallow layout qualifiers which may only appear on layout declarations. */
2475 if (qual
->flags
.q
.prim_type
) {
2476 _mesa_glsl_error(loc
, state
,
2477 "Primitive type may only be specified on GS input or output "
2478 "layout declaration, not on variables.");
2481 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2483 * "However, the const qualifier cannot be used with out or inout."
2485 * The same section of the GLSL 4.40 spec further clarifies this saying:
2487 * "The const qualifier cannot be used with out or inout, or a
2488 * compile-time error results."
2490 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2491 _mesa_glsl_error(loc
, state
,
2492 "`const' may not be applied to `out' or `inout' "
2493 "function parameters");
2496 /* If there is no qualifier that changes the mode of the variable, leave
2497 * the setting alone.
2499 assert(var
->data
.mode
!= ir_var_temporary
);
2500 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2501 var
->data
.mode
= ir_var_function_inout
;
2502 else if (qual
->flags
.q
.in
)
2503 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2504 else if (qual
->flags
.q
.attribute
2505 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2506 var
->data
.mode
= ir_var_shader_in
;
2507 else if (qual
->flags
.q
.out
)
2508 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2509 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
2510 var
->data
.mode
= ir_var_shader_out
;
2511 else if (qual
->flags
.q
.uniform
)
2512 var
->data
.mode
= ir_var_uniform
;
2514 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
2515 /* User-defined ins/outs are not permitted in compute shaders. */
2516 if (state
->stage
== MESA_SHADER_COMPUTE
) {
2517 _mesa_glsl_error(loc
, state
,
2518 "user-defined input and output variables are not "
2519 "permitted in compute shaders");
2522 /* This variable is being used to link data between shader stages (in
2523 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2524 * that is allowed for such purposes.
2526 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2528 * "The varying qualifier can be used only with the data types
2529 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2532 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2533 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2535 * "Fragment inputs can only be signed and unsigned integers and
2536 * integer vectors, float, floating-point vectors, matrices, or
2537 * arrays of these. Structures cannot be input.
2539 * Similar text exists in the section on vertex shader outputs.
2541 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2542 * 3.00 spec allows structs as well. Varying structs are also allowed
2545 switch (var
->type
->get_scalar_type()->base_type
) {
2546 case GLSL_TYPE_FLOAT
:
2547 /* Ok in all GLSL versions */
2549 case GLSL_TYPE_UINT
:
2551 if (state
->is_version(130, 300))
2553 _mesa_glsl_error(loc
, state
,
2554 "varying variables must be of base type float in %s",
2555 state
->get_version_string());
2557 case GLSL_TYPE_STRUCT
:
2558 if (state
->is_version(150, 300))
2560 _mesa_glsl_error(loc
, state
,
2561 "varying variables may not be of type struct");
2564 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2569 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2570 switch (state
->stage
) {
2571 case MESA_SHADER_VERTEX
:
2572 if (var
->data
.mode
== ir_var_shader_out
)
2573 var
->data
.invariant
= true;
2575 case MESA_SHADER_GEOMETRY
:
2576 if ((var
->data
.mode
== ir_var_shader_in
)
2577 || (var
->data
.mode
== ir_var_shader_out
))
2578 var
->data
.invariant
= true;
2580 case MESA_SHADER_FRAGMENT
:
2581 if (var
->data
.mode
== ir_var_shader_in
)
2582 var
->data
.invariant
= true;
2584 case MESA_SHADER_COMPUTE
:
2585 /* Invariance isn't meaningful in compute shaders. */
2590 var
->data
.interpolation
=
2591 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
2594 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2595 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2596 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2597 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2598 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2599 ? "origin_upper_left" : "pixel_center_integer";
2601 _mesa_glsl_error(loc
, state
,
2602 "layout qualifier `%s' can only be applied to "
2603 "fragment shader input `gl_FragCoord'",
2607 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
2609 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
2611 * "Within any shader, the first redeclarations of gl_FragCoord
2612 * must appear before any use of gl_FragCoord."
2614 * Generate a compiler error if above condition is not met by the
2617 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
2618 if (earlier
!= NULL
&&
2619 earlier
->data
.used
&&
2620 !state
->fs_redeclares_gl_fragcoord
) {
2621 _mesa_glsl_error(loc
, state
,
2622 "gl_FragCoord used before its first redeclaration "
2623 "in fragment shader");
2626 /* Make sure all gl_FragCoord redeclarations specify the same layout
2629 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
2630 const char *const qual_string
=
2631 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
2632 qual
->flags
.q
.pixel_center_integer
);
2634 const char *const state_string
=
2635 get_layout_qualifier_string(state
->fs_origin_upper_left
,
2636 state
->fs_pixel_center_integer
);
2638 _mesa_glsl_error(loc
, state
,
2639 "gl_FragCoord redeclared with different layout "
2640 "qualifiers (%s) and (%s) ",
2644 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2645 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2646 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
2647 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
2648 state
->fs_redeclares_gl_fragcoord
=
2649 state
->fs_origin_upper_left
||
2650 state
->fs_pixel_center_integer
||
2651 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
2654 if (qual
->flags
.q
.explicit_location
) {
2655 validate_explicit_location(qual
, var
, state
, loc
);
2656 } else if (qual
->flags
.q
.explicit_index
) {
2657 _mesa_glsl_error(loc
, state
, "explicit index requires explicit location");
2660 if (qual
->flags
.q
.explicit_binding
&&
2661 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2662 var
->data
.explicit_binding
= true;
2663 var
->data
.binding
= qual
->binding
;
2666 if (var
->type
->contains_atomic()) {
2667 if (var
->data
.mode
== ir_var_uniform
) {
2668 if (var
->data
.explicit_binding
) {
2670 &state
->atomic_counter_offsets
[var
->data
.binding
];
2672 if (*offset
% ATOMIC_COUNTER_SIZE
)
2673 _mesa_glsl_error(loc
, state
,
2674 "misaligned atomic counter offset");
2676 var
->data
.atomic
.offset
= *offset
;
2677 *offset
+= var
->type
->atomic_size();
2680 _mesa_glsl_error(loc
, state
,
2681 "atomic counters require explicit binding point");
2683 } else if (var
->data
.mode
!= ir_var_function_in
) {
2684 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
2685 "function parameters or uniform-qualified "
2686 "global variables");
2690 /* Does the declaration use the deprecated 'attribute' or 'varying'
2693 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2694 || qual
->flags
.q
.varying
;
2697 /* Validate auxiliary storage qualifiers */
2699 /* From section 4.3.4 of the GLSL 1.30 spec:
2700 * "It is an error to use centroid in in a vertex shader."
2702 * From section 4.3.4 of the GLSL ES 3.00 spec:
2703 * "It is an error to use centroid in or interpolation qualifiers in
2704 * a vertex shader input."
2707 /* Section 4.3.6 of the GLSL 1.30 specification states:
2708 * "It is an error to use centroid out in a fragment shader."
2710 * The GL_ARB_shading_language_420pack extension specification states:
2711 * "It is an error to use auxiliary storage qualifiers or interpolation
2712 * qualifiers on an output in a fragment shader."
2714 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
2715 _mesa_glsl_error(loc
, state
,
2716 "sample qualifier may only be used on `in` or `out` "
2717 "variables between shader stages");
2719 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
2720 _mesa_glsl_error(loc
, state
,
2721 "centroid qualifier may only be used with `in', "
2722 "`out' or `varying' variables between shader stages");
2726 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2727 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2728 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2729 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2730 * These extensions and all following extensions that add the 'layout'
2731 * keyword have been modified to require the use of 'in' or 'out'.
2733 * The following extension do not allow the deprecated keywords:
2735 * GL_AMD_conservative_depth
2736 * GL_ARB_conservative_depth
2737 * GL_ARB_gpu_shader5
2738 * GL_ARB_separate_shader_objects
2739 * GL_ARB_tesselation_shader
2740 * GL_ARB_transform_feedback3
2741 * GL_ARB_uniform_buffer_object
2743 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2744 * allow layout with the deprecated keywords.
2746 const bool relaxed_layout_qualifier_checking
=
2747 state
->ARB_fragment_coord_conventions_enable
;
2749 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2750 if (relaxed_layout_qualifier_checking
) {
2751 _mesa_glsl_warning(loc
, state
,
2752 "`layout' qualifier may not be used with "
2753 "`attribute' or `varying'");
2755 _mesa_glsl_error(loc
, state
,
2756 "`layout' qualifier may not be used with "
2757 "`attribute' or `varying'");
2761 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2762 * AMD_conservative_depth.
2764 int depth_layout_count
= qual
->flags
.q
.depth_any
2765 + qual
->flags
.q
.depth_greater
2766 + qual
->flags
.q
.depth_less
2767 + qual
->flags
.q
.depth_unchanged
;
2768 if (depth_layout_count
> 0
2769 && !state
->AMD_conservative_depth_enable
2770 && !state
->ARB_conservative_depth_enable
) {
2771 _mesa_glsl_error(loc
, state
,
2772 "extension GL_AMD_conservative_depth or "
2773 "GL_ARB_conservative_depth must be enabled "
2774 "to use depth layout qualifiers");
2775 } else if (depth_layout_count
> 0
2776 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2777 _mesa_glsl_error(loc
, state
,
2778 "depth layout qualifiers can be applied only to "
2780 } else if (depth_layout_count
> 1
2781 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2782 _mesa_glsl_error(loc
, state
,
2783 "at most one depth layout qualifier can be applied to "
2786 if (qual
->flags
.q
.depth_any
)
2787 var
->data
.depth_layout
= ir_depth_layout_any
;
2788 else if (qual
->flags
.q
.depth_greater
)
2789 var
->data
.depth_layout
= ir_depth_layout_greater
;
2790 else if (qual
->flags
.q
.depth_less
)
2791 var
->data
.depth_layout
= ir_depth_layout_less
;
2792 else if (qual
->flags
.q
.depth_unchanged
)
2793 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
2795 var
->data
.depth_layout
= ir_depth_layout_none
;
2797 if (qual
->flags
.q
.std140
||
2798 qual
->flags
.q
.packed
||
2799 qual
->flags
.q
.shared
) {
2800 _mesa_glsl_error(loc
, state
,
2801 "uniform block layout qualifiers std140, packed, and "
2802 "shared can only be applied to uniform blocks, not "
2806 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2807 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
2810 if (var
->type
->contains_image())
2811 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
2815 * Get the variable that is being redeclared by this declaration
2817 * Semantic checks to verify the validity of the redeclaration are also
2818 * performed. If semantic checks fail, compilation error will be emitted via
2819 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2822 * A pointer to an existing variable in the current scope if the declaration
2823 * is a redeclaration, \c NULL otherwise.
2825 static ir_variable
*
2826 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
2827 struct _mesa_glsl_parse_state
*state
,
2828 bool allow_all_redeclarations
)
2830 /* Check if this declaration is actually a re-declaration, either to
2831 * resize an array or add qualifiers to an existing variable.
2833 * This is allowed for variables in the current scope, or when at
2834 * global scope (for built-ins in the implicit outer scope).
2836 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
2837 if (earlier
== NULL
||
2838 (state
->current_function
!= NULL
&&
2839 !state
->symbols
->name_declared_this_scope(var
->name
))) {
2844 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2846 * "It is legal to declare an array without a size and then
2847 * later re-declare the same name as an array of the same
2848 * type and specify a size."
2850 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
2851 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2852 /* FINISHME: This doesn't match the qualifiers on the two
2853 * FINISHME: declarations. It's not 100% clear whether this is
2854 * FINISHME: required or not.
2857 const unsigned size
= unsigned(var
->type
->array_size());
2858 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2859 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
2860 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2862 earlier
->data
.max_array_access
);
2865 earlier
->type
= var
->type
;
2868 } else if ((state
->ARB_fragment_coord_conventions_enable
||
2869 state
->is_version(150, 0))
2870 && strcmp(var
->name
, "gl_FragCoord") == 0
2871 && earlier
->type
== var
->type
2872 && earlier
->data
.mode
== var
->data
.mode
) {
2873 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2876 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
2877 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
2879 /* According to section 4.3.7 of the GLSL 1.30 spec,
2880 * the following built-in varaibles can be redeclared with an
2881 * interpolation qualifier:
2884 * * gl_FrontSecondaryColor
2885 * * gl_BackSecondaryColor
2887 * * gl_SecondaryColor
2889 } else if (state
->is_version(130, 0)
2890 && (strcmp(var
->name
, "gl_FrontColor") == 0
2891 || strcmp(var
->name
, "gl_BackColor") == 0
2892 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2893 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2894 || strcmp(var
->name
, "gl_Color") == 0
2895 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2896 && earlier
->type
== var
->type
2897 && earlier
->data
.mode
== var
->data
.mode
) {
2898 earlier
->data
.interpolation
= var
->data
.interpolation
;
2900 /* Layout qualifiers for gl_FragDepth. */
2901 } else if ((state
->AMD_conservative_depth_enable
||
2902 state
->ARB_conservative_depth_enable
)
2903 && strcmp(var
->name
, "gl_FragDepth") == 0
2904 && earlier
->type
== var
->type
2905 && earlier
->data
.mode
== var
->data
.mode
) {
2907 /** From the AMD_conservative_depth spec:
2908 * Within any shader, the first redeclarations of gl_FragDepth
2909 * must appear before any use of gl_FragDepth.
2911 if (earlier
->data
.used
) {
2912 _mesa_glsl_error(&loc
, state
,
2913 "the first redeclaration of gl_FragDepth "
2914 "must appear before any use of gl_FragDepth");
2917 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2918 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
2919 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
2920 _mesa_glsl_error(&loc
, state
,
2921 "gl_FragDepth: depth layout is declared here "
2922 "as '%s, but it was previously declared as "
2924 depth_layout_string(var
->data
.depth_layout
),
2925 depth_layout_string(earlier
->data
.depth_layout
));
2928 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
2930 } else if (allow_all_redeclarations
) {
2931 if (earlier
->data
.mode
!= var
->data
.mode
) {
2932 _mesa_glsl_error(&loc
, state
,
2933 "redeclaration of `%s' with incorrect qualifiers",
2935 } else if (earlier
->type
!= var
->type
) {
2936 _mesa_glsl_error(&loc
, state
,
2937 "redeclaration of `%s' has incorrect type",
2941 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
2948 * Generate the IR for an initializer in a variable declaration
2951 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2952 ast_fully_specified_type
*type
,
2953 exec_list
*initializer_instructions
,
2954 struct _mesa_glsl_parse_state
*state
)
2956 ir_rvalue
*result
= NULL
;
2958 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2960 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2962 * "All uniform variables are read-only and are initialized either
2963 * directly by an application via API commands, or indirectly by
2966 if (var
->data
.mode
== ir_var_uniform
) {
2967 state
->check_version(120, 0, &initializer_loc
,
2968 "cannot initialize uniforms");
2971 /* From section 4.1.7 of the GLSL 4.40 spec:
2973 * "Opaque variables [...] are initialized only through the
2974 * OpenGL API; they cannot be declared with an initializer in a
2977 if (var
->type
->contains_opaque()) {
2978 _mesa_glsl_error(& initializer_loc
, state
,
2979 "cannot initialize opaque variable");
2982 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2983 _mesa_glsl_error(& initializer_loc
, state
,
2984 "cannot initialize %s shader input / %s",
2985 _mesa_shader_stage_to_string(state
->stage
),
2986 (state
->stage
== MESA_SHADER_VERTEX
)
2987 ? "attribute" : "varying");
2990 /* If the initializer is an ast_aggregate_initializer, recursively store
2991 * type information from the LHS into it, so that its hir() function can do
2994 if (decl
->initializer
->oper
== ast_aggregate
)
2995 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
2997 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2998 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3000 /* Calculate the constant value if this is a const or uniform
3003 if (type
->qualifier
.flags
.q
.constant
3004 || type
->qualifier
.flags
.q
.uniform
) {
3005 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3006 var
->type
, rhs
, true);
3007 if (new_rhs
!= NULL
) {
3010 ir_constant
*constant_value
= rhs
->constant_expression_value();
3011 if (!constant_value
) {
3012 /* If ARB_shading_language_420pack is enabled, initializers of
3013 * const-qualified local variables do not have to be constant
3014 * expressions. Const-qualified global variables must still be
3015 * initialized with constant expressions.
3017 if (!state
->ARB_shading_language_420pack_enable
3018 || state
->current_function
== NULL
) {
3019 _mesa_glsl_error(& initializer_loc
, state
,
3020 "initializer of %s variable `%s' must be a "
3021 "constant expression",
3022 (type
->qualifier
.flags
.q
.constant
)
3023 ? "const" : "uniform",
3025 if (var
->type
->is_numeric()) {
3026 /* Reduce cascading errors. */
3027 var
->constant_value
= ir_constant::zero(state
, var
->type
);
3031 rhs
= constant_value
;
3032 var
->constant_value
= constant_value
;
3035 if (var
->type
->is_numeric()) {
3036 /* Reduce cascading errors. */
3037 var
->constant_value
= ir_constant::zero(state
, var
->type
);
3042 if (rhs
&& !rhs
->type
->is_error()) {
3043 bool temp
= var
->data
.read_only
;
3044 if (type
->qualifier
.flags
.q
.constant
)
3045 var
->data
.read_only
= false;
3047 /* Never emit code to initialize a uniform.
3049 const glsl_type
*initializer_type
;
3050 if (!type
->qualifier
.flags
.q
.uniform
) {
3051 do_assignment(initializer_instructions
, state
,
3056 type
->get_location());
3057 initializer_type
= result
->type
;
3059 initializer_type
= rhs
->type
;
3061 var
->constant_initializer
= rhs
->constant_expression_value();
3062 var
->data
.has_initializer
= true;
3064 /* If the declared variable is an unsized array, it must inherrit
3065 * its full type from the initializer. A declaration such as
3067 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3071 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3073 * The assignment generated in the if-statement (below) will also
3074 * automatically handle this case for non-uniforms.
3076 * If the declared variable is not an array, the types must
3077 * already match exactly. As a result, the type assignment
3078 * here can be done unconditionally. For non-uniforms the call
3079 * to do_assignment can change the type of the initializer (via
3080 * the implicit conversion rules). For uniforms the initializer
3081 * must be a constant expression, and the type of that expression
3082 * was validated above.
3084 var
->type
= initializer_type
;
3086 var
->data
.read_only
= temp
;
3094 * Do additional processing necessary for geometry shader input declarations
3095 * (this covers both interface blocks arrays and bare input variables).
3098 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3099 YYLTYPE loc
, ir_variable
*var
)
3101 unsigned num_vertices
= 0;
3102 if (state
->gs_input_prim_type_specified
) {
3103 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3106 /* Geometry shader input variables must be arrays. Caller should have
3107 * reported an error for this.
3109 if (!var
->type
->is_array()) {
3110 assert(state
->error
);
3112 /* To avoid cascading failures, short circuit the checks below. */
3116 if (var
->type
->is_unsized_array()) {
3117 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3119 * All geometry shader input unsized array declarations will be
3120 * sized by an earlier input layout qualifier, when present, as per
3121 * the following table.
3123 * Followed by a table mapping each allowed input layout qualifier to
3124 * the corresponding input length.
3126 if (num_vertices
!= 0)
3127 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3130 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3131 * includes the following examples of compile-time errors:
3133 * // code sequence within one shader...
3134 * in vec4 Color1[]; // size unknown
3135 * ...Color1.length()...// illegal, length() unknown
3136 * in vec4 Color2[2]; // size is 2
3137 * ...Color1.length()...// illegal, Color1 still has no size
3138 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3139 * layout(lines) in; // legal, input size is 2, matching
3140 * in vec4 Color4[3]; // illegal, contradicts layout
3143 * To detect the case illustrated by Color3, we verify that the size of
3144 * an explicitly-sized array matches the size of any previously declared
3145 * explicitly-sized array. To detect the case illustrated by Color4, we
3146 * verify that the size of an explicitly-sized array is consistent with
3147 * any previously declared input layout.
3149 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3150 _mesa_glsl_error(&loc
, state
,
3151 "geometry shader input size contradicts previously"
3152 " declared layout (size is %u, but layout requires a"
3153 " size of %u)", var
->type
->length
, num_vertices
);
3154 } else if (state
->gs_input_size
!= 0 &&
3155 var
->type
->length
!= state
->gs_input_size
) {
3156 _mesa_glsl_error(&loc
, state
,
3157 "geometry shader input sizes are "
3158 "inconsistent (size is %u, but a previous "
3159 "declaration has size %u)",
3160 var
->type
->length
, state
->gs_input_size
);
3162 state
->gs_input_size
= var
->type
->length
;
3169 validate_identifier(const char *identifier
, YYLTYPE loc
,
3170 struct _mesa_glsl_parse_state
*state
)
3172 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3174 * "Identifiers starting with "gl_" are reserved for use by
3175 * OpenGL, and may not be declared in a shader as either a
3176 * variable or a function."
3178 if (is_gl_identifier(identifier
)) {
3179 _mesa_glsl_error(&loc
, state
,
3180 "identifier `%s' uses reserved `gl_' prefix",
3182 } else if (strstr(identifier
, "__")) {
3183 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3186 * "In addition, all identifiers containing two
3187 * consecutive underscores (__) are reserved as
3188 * possible future keywords."
3190 * The intention is that names containing __ are reserved for internal
3191 * use by the implementation, and names prefixed with GL_ are reserved
3192 * for use by Khronos. Names simply containing __ are dangerous to use,
3193 * but should be allowed.
3195 * A future version of the GLSL specification will clarify this.
3197 _mesa_glsl_warning(&loc
, state
,
3198 "identifier `%s' uses reserved `__' string",
3204 precision_qualifier_allowed(const glsl_type
*type
)
3206 /* Precision qualifiers apply to floating point, integer and sampler
3209 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3210 * "Any floating point or any integer declaration can have the type
3211 * preceded by one of these precision qualifiers [...] Literal
3212 * constants do not have precision qualifiers. Neither do Boolean
3215 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3218 * "Precision qualifiers are added for code portability with OpenGL
3219 * ES, not for functionality. They have the same syntax as in OpenGL
3222 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3224 * "uniform lowp sampler2D sampler;
3227 * lowp vec4 col = texture2D (sampler, coord);
3228 * // texture2D returns lowp"
3230 * From this, we infer that GLSL 1.30 (and later) should allow precision
3231 * qualifiers on sampler types just like float and integer types.
3233 return type
->is_float()
3234 || type
->is_integer()
3235 || type
->is_record()
3236 || type
->is_sampler();
3240 ast_declarator_list::hir(exec_list
*instructions
,
3241 struct _mesa_glsl_parse_state
*state
)
3244 const struct glsl_type
*decl_type
;
3245 const char *type_name
= NULL
;
3246 ir_rvalue
*result
= NULL
;
3247 YYLTYPE loc
= this->get_location();
3249 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
3251 * "To ensure that a particular output variable is invariant, it is
3252 * necessary to use the invariant qualifier. It can either be used to
3253 * qualify a previously declared variable as being invariant
3255 * invariant gl_Position; // make existing gl_Position be invariant"
3257 * In these cases the parser will set the 'invariant' flag in the declarator
3258 * list, and the type will be NULL.
3260 if (this->invariant
) {
3261 assert(this->type
== NULL
);
3263 if (state
->current_function
!= NULL
) {
3264 _mesa_glsl_error(& loc
, state
,
3265 "all uses of `invariant' keyword must be at global "
3269 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3270 assert(decl
->array_specifier
== NULL
);
3271 assert(decl
->initializer
== NULL
);
3273 ir_variable
*const earlier
=
3274 state
->symbols
->get_variable(decl
->identifier
);
3275 if (earlier
== NULL
) {
3276 _mesa_glsl_error(& loc
, state
,
3277 "undeclared variable `%s' cannot be marked "
3278 "invariant", decl
->identifier
);
3279 } else if (!is_varying_var(earlier
, state
->stage
)) {
3280 _mesa_glsl_error(&loc
, state
,
3281 "`%s' cannot be marked invariant; interfaces between "
3282 "shader stages only.", decl
->identifier
);
3283 } else if (earlier
->data
.used
) {
3284 _mesa_glsl_error(& loc
, state
,
3285 "variable `%s' may not be redeclared "
3286 "`invariant' after being used",
3289 earlier
->data
.invariant
= true;
3293 /* Invariant redeclarations do not have r-values.
3298 if (this->precise
) {
3299 assert(this->type
== NULL
);
3301 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3302 assert(decl
->array_specifier
== NULL
);
3303 assert(decl
->initializer
== NULL
);
3305 ir_variable
*const earlier
=
3306 state
->symbols
->get_variable(decl
->identifier
);
3307 if (earlier
== NULL
) {
3308 _mesa_glsl_error(& loc
, state
,
3309 "undeclared variable `%s' cannot be marked "
3310 "precise", decl
->identifier
);
3311 } else if (state
->current_function
!= NULL
&&
3312 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
3313 /* Note: we have to check if we're in a function, since
3314 * builtins are treated as having come from another scope.
3316 _mesa_glsl_error(& loc
, state
,
3317 "variable `%s' from an outer scope may not be "
3318 "redeclared `precise' in this scope",
3320 } else if (earlier
->data
.used
) {
3321 _mesa_glsl_error(& loc
, state
,
3322 "variable `%s' may not be redeclared "
3323 "`precise' after being used",
3326 earlier
->data
.precise
= true;
3330 /* Precise redeclarations do not have r-values either. */
3334 assert(this->type
!= NULL
);
3335 assert(!this->invariant
);
3336 assert(!this->precise
);
3338 /* The type specifier may contain a structure definition. Process that
3339 * before any of the variable declarations.
3341 (void) this->type
->specifier
->hir(instructions
, state
);
3343 decl_type
= this->type
->glsl_type(& type_name
, state
);
3345 /* An offset-qualified atomic counter declaration sets the default
3346 * offset for the next declaration within the same atomic counter
3349 if (decl_type
&& decl_type
->contains_atomic()) {
3350 if (type
->qualifier
.flags
.q
.explicit_binding
&&
3351 type
->qualifier
.flags
.q
.explicit_offset
)
3352 state
->atomic_counter_offsets
[type
->qualifier
.binding
] =
3353 type
->qualifier
.offset
;
3356 if (this->declarations
.is_empty()) {
3357 /* If there is no structure involved in the program text, there are two
3358 * possible scenarios:
3360 * - The program text contained something like 'vec4;'. This is an
3361 * empty declaration. It is valid but weird. Emit a warning.
3363 * - The program text contained something like 'S;' and 'S' is not the
3364 * name of a known structure type. This is both invalid and weird.
3367 * - The program text contained something like 'mediump float;'
3368 * when the programmer probably meant 'precision mediump
3369 * float;' Emit a warning with a description of what they
3370 * probably meant to do.
3372 * Note that if decl_type is NULL and there is a structure involved,
3373 * there must have been some sort of error with the structure. In this
3374 * case we assume that an error was already generated on this line of
3375 * code for the structure. There is no need to generate an additional,
3378 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
3381 if (decl_type
== NULL
) {
3382 _mesa_glsl_error(&loc
, state
,
3383 "invalid type `%s' in empty declaration",
3385 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
3386 /* Empty atomic counter declarations are allowed and useful
3387 * to set the default offset qualifier.
3390 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3391 if (this->type
->specifier
->structure
!= NULL
) {
3392 _mesa_glsl_error(&loc
, state
,
3393 "precision qualifiers can't be applied "
3396 static const char *const precision_names
[] = {
3403 _mesa_glsl_warning(&loc
, state
,
3404 "empty declaration with precision qualifier, "
3405 "to set the default precision, use "
3406 "`precision %s %s;'",
3407 precision_names
[this->type
->qualifier
.precision
],
3410 } else if (this->type
->specifier
->structure
== NULL
) {
3411 _mesa_glsl_warning(&loc
, state
, "empty declaration");
3415 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3416 const struct glsl_type
*var_type
;
3419 /* FINISHME: Emit a warning if a variable declaration shadows a
3420 * FINISHME: declaration at a higher scope.
3423 if ((decl_type
== NULL
) || decl_type
->is_void()) {
3424 if (type_name
!= NULL
) {
3425 _mesa_glsl_error(& loc
, state
,
3426 "invalid type `%s' in declaration of `%s'",
3427 type_name
, decl
->identifier
);
3429 _mesa_glsl_error(& loc
, state
,
3430 "invalid type in declaration of `%s'",
3436 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
3439 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
3441 /* The 'varying in' and 'varying out' qualifiers can only be used with
3442 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
3445 if (this->type
->qualifier
.flags
.q
.varying
) {
3446 if (this->type
->qualifier
.flags
.q
.in
) {
3447 _mesa_glsl_error(& loc
, state
,
3448 "`varying in' qualifier in declaration of "
3449 "`%s' only valid for geometry shaders using "
3450 "ARB_geometry_shader4 or EXT_geometry_shader4",
3452 } else if (this->type
->qualifier
.flags
.q
.out
) {
3453 _mesa_glsl_error(& loc
, state
,
3454 "`varying out' qualifier in declaration of "
3455 "`%s' only valid for geometry shaders using "
3456 "ARB_geometry_shader4 or EXT_geometry_shader4",
3461 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
3463 * "Global variables can only use the qualifiers const,
3464 * attribute, uniform, or varying. Only one may be
3467 * Local variables can only use the qualifier const."
3469 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
3470 * any extension that adds the 'layout' keyword.
3472 if (!state
->is_version(130, 300)
3473 && !state
->has_explicit_attrib_location()
3474 && !state
->has_separate_shader_objects()
3475 && !state
->ARB_fragment_coord_conventions_enable
) {
3476 if (this->type
->qualifier
.flags
.q
.out
) {
3477 _mesa_glsl_error(& loc
, state
,
3478 "`out' qualifier in declaration of `%s' "
3479 "only valid for function parameters in %s",
3480 decl
->identifier
, state
->get_version_string());
3482 if (this->type
->qualifier
.flags
.q
.in
) {
3483 _mesa_glsl_error(& loc
, state
,
3484 "`in' qualifier in declaration of `%s' "
3485 "only valid for function parameters in %s",
3486 decl
->identifier
, state
->get_version_string());
3488 /* FINISHME: Test for other invalid qualifiers. */
3491 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
3494 if (this->type
->qualifier
.flags
.q
.invariant
) {
3495 if (!is_varying_var(var
, state
->stage
)) {
3496 _mesa_glsl_error(&loc
, state
,
3497 "`%s' cannot be marked invariant; interfaces between "
3498 "shader stages only", var
->name
);
3502 if (state
->current_function
!= NULL
) {
3503 const char *mode
= NULL
;
3504 const char *extra
= "";
3506 /* There is no need to check for 'inout' here because the parser will
3507 * only allow that in function parameter lists.
3509 if (this->type
->qualifier
.flags
.q
.attribute
) {
3511 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
3513 } else if (this->type
->qualifier
.flags
.q
.varying
) {
3515 } else if (this->type
->qualifier
.flags
.q
.in
) {
3517 extra
= " or in function parameter list";
3518 } else if (this->type
->qualifier
.flags
.q
.out
) {
3520 extra
= " or in function parameter list";
3524 _mesa_glsl_error(& loc
, state
,
3525 "%s variable `%s' must be declared at "
3527 mode
, var
->name
, extra
);
3529 } else if (var
->data
.mode
== ir_var_shader_in
) {
3530 var
->data
.read_only
= true;
3532 if (state
->stage
== MESA_SHADER_VERTEX
) {
3533 bool error_emitted
= false;
3535 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3537 * "Vertex shader inputs can only be float, floating-point
3538 * vectors, matrices, signed and unsigned integers and integer
3539 * vectors. Vertex shader inputs can also form arrays of these
3540 * types, but not structures."
3542 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3544 * "Vertex shader inputs can only be float, floating-point
3545 * vectors, matrices, signed and unsigned integers and integer
3546 * vectors. They cannot be arrays or structures."
3548 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3550 * "The attribute qualifier can be used only with float,
3551 * floating-point vectors, and matrices. Attribute variables
3552 * cannot be declared as arrays or structures."
3554 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3556 * "Vertex shader inputs can only be float, floating-point
3557 * vectors, matrices, signed and unsigned integers and integer
3558 * vectors. Vertex shader inputs cannot be arrays or
3561 const glsl_type
*check_type
= var
->type
;
3562 while (check_type
->is_array())
3563 check_type
= check_type
->element_type();
3565 switch (check_type
->base_type
) {
3566 case GLSL_TYPE_FLOAT
:
3568 case GLSL_TYPE_UINT
:
3570 if (state
->is_version(120, 300))
3574 _mesa_glsl_error(& loc
, state
,
3575 "vertex shader input / attribute cannot have "
3577 var
->type
->is_array() ? "array of " : "",
3579 error_emitted
= true;
3582 if (!error_emitted
&& var
->type
->is_array() &&
3583 !state
->check_version(150, 0, &loc
,
3584 "vertex shader input / attribute "
3585 "cannot have array type")) {
3586 error_emitted
= true;
3588 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
3589 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3591 * Geometry shader input variables get the per-vertex values
3592 * written out by vertex shader output variables of the same
3593 * names. Since a geometry shader operates on a set of
3594 * vertices, each input varying variable (or input block, see
3595 * interface blocks below) needs to be declared as an array.
3597 if (!var
->type
->is_array()) {
3598 _mesa_glsl_error(&loc
, state
,
3599 "geometry shader inputs must be arrays");
3602 handle_geometry_shader_input_decl(state
, loc
, var
);
3606 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3607 * so must integer vertex outputs.
3609 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3610 * "Fragment shader inputs that are signed or unsigned integers or
3611 * integer vectors must be qualified with the interpolation qualifier
3614 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3615 * "Fragment shader inputs that are, or contain, signed or unsigned
3616 * integers or integer vectors must be qualified with the
3617 * interpolation qualifier flat."
3619 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3620 * "Vertex shader outputs that are, or contain, signed or unsigned
3621 * integers or integer vectors must be qualified with the
3622 * interpolation qualifier flat."
3624 * Note that prior to GLSL 1.50, this requirement applied to vertex
3625 * outputs rather than fragment inputs. That creates problems in the
3626 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3627 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3628 * apply the restriction to both vertex outputs and fragment inputs.
3630 * Note also that the desktop GLSL specs are missing the text "or
3631 * contain"; this is presumably an oversight, since there is no
3632 * reasonable way to interpolate a fragment shader input that contains
3635 if (state
->is_version(130, 300) &&
3636 var
->type
->contains_integer() &&
3637 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
3638 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
3639 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
3640 && state
->es_shader
))) {
3641 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
3642 "vertex output" : "fragment input";
3643 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
3644 "an integer, then it must be qualified with 'flat'",
3649 /* Interpolation qualifiers cannot be applied to 'centroid' and
3650 * 'centroid varying'.
3652 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3653 * "interpolation qualifiers may only precede the qualifiers in,
3654 * centroid in, out, or centroid out in a declaration. They do not apply
3655 * to the deprecated storage qualifiers varying or centroid varying."
3657 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3659 if (state
->is_version(130, 0)
3660 && this->type
->qualifier
.has_interpolation()
3661 && this->type
->qualifier
.flags
.q
.varying
) {
3663 const char *i
= this->type
->qualifier
.interpolation_string();
3666 if (this->type
->qualifier
.flags
.q
.centroid
)
3667 s
= "centroid varying";
3671 _mesa_glsl_error(&loc
, state
,
3672 "qualifier '%s' cannot be applied to the "
3673 "deprecated storage qualifier '%s'", i
, s
);
3677 /* Interpolation qualifiers can only apply to vertex shader outputs and
3678 * fragment shader inputs.
3680 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3681 * "Outputs from a vertex shader (out) and inputs to a fragment
3682 * shader (in) can be further qualified with one or more of these
3683 * interpolation qualifiers"
3685 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
3686 * "These interpolation qualifiers may only precede the qualifiers
3687 * in, centroid in, out, or centroid out in a declaration. They do
3688 * not apply to inputs into a vertex shader or outputs from a
3691 if (state
->is_version(130, 300)
3692 && this->type
->qualifier
.has_interpolation()) {
3694 const char *i
= this->type
->qualifier
.interpolation_string();
3697 switch (state
->stage
) {
3698 case MESA_SHADER_VERTEX
:
3699 if (this->type
->qualifier
.flags
.q
.in
) {
3700 _mesa_glsl_error(&loc
, state
,
3701 "qualifier '%s' cannot be applied to vertex "
3702 "shader inputs", i
);
3705 case MESA_SHADER_FRAGMENT
:
3706 if (this->type
->qualifier
.flags
.q
.out
) {
3707 _mesa_glsl_error(&loc
, state
,
3708 "qualifier '%s' cannot be applied to fragment "
3709 "shader outputs", i
);
3718 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
3720 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3721 state
->check_precision_qualifiers_allowed(&loc
);
3725 /* If a precision qualifier is allowed on a type, it is allowed on
3726 * an array of that type.
3728 if (!(this->type
->qualifier
.precision
== ast_precision_none
3729 || precision_qualifier_allowed(var
->type
)
3730 || (var
->type
->is_array()
3731 && precision_qualifier_allowed(var
->type
->fields
.array
)))) {
3733 _mesa_glsl_error(&loc
, state
,
3734 "precision qualifiers apply only to floating point"
3735 ", integer and sampler types");
3738 /* From section 4.1.7 of the GLSL 4.40 spec:
3740 * "[Opaque types] can only be declared as function
3741 * parameters or uniform-qualified variables."
3743 if (var_type
->contains_opaque() &&
3744 !this->type
->qualifier
.flags
.q
.uniform
) {
3745 _mesa_glsl_error(&loc
, state
,
3746 "opaque variables must be declared uniform");
3749 /* Process the initializer and add its instructions to a temporary
3750 * list. This list will be added to the instruction stream (below) after
3751 * the declaration is added. This is done because in some cases (such as
3752 * redeclarations) the declaration may not actually be added to the
3753 * instruction stream.
3755 exec_list initializer_instructions
;
3757 /* Examine var name here since var may get deleted in the next call */
3758 bool var_is_gl_id
= is_gl_identifier(var
->name
);
3760 ir_variable
*earlier
=
3761 get_variable_being_redeclared(var
, decl
->get_location(), state
,
3762 false /* allow_all_redeclarations */);
3763 if (earlier
!= NULL
) {
3765 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
3766 _mesa_glsl_error(&loc
, state
,
3767 "`%s' has already been redeclared using "
3768 "gl_PerVertex", earlier
->name
);
3770 earlier
->data
.how_declared
= ir_var_declared_normally
;
3773 if (decl
->initializer
!= NULL
) {
3774 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3776 &initializer_instructions
, state
);
3779 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3781 * "It is an error to write to a const variable outside of
3782 * its declaration, so they must be initialized when
3785 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3786 _mesa_glsl_error(& loc
, state
,
3787 "const declaration of `%s' must be initialized",
3791 if (state
->es_shader
) {
3792 const glsl_type
*const t
= (earlier
== NULL
)
3793 ? var
->type
: earlier
->type
;
3795 if (t
->is_unsized_array())
3796 /* Section 10.17 of the GLSL ES 1.00 specification states that
3797 * unsized array declarations have been removed from the language.
3798 * Arrays that are sized using an initializer are still explicitly
3799 * sized. However, GLSL ES 1.00 does not allow array
3800 * initializers. That is only allowed in GLSL ES 3.00.
3802 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
3804 * "An array type can also be formed without specifying a size
3805 * if the definition includes an initializer:
3807 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
3808 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
3813 _mesa_glsl_error(& loc
, state
,
3814 "unsized array declarations are not allowed in "
3818 /* If the declaration is not a redeclaration, there are a few additional
3819 * semantic checks that must be applied. In addition, variable that was
3820 * created for the declaration should be added to the IR stream.
3822 if (earlier
== NULL
) {
3823 validate_identifier(decl
->identifier
, loc
, state
);
3825 /* Add the variable to the symbol table. Note that the initializer's
3826 * IR was already processed earlier (though it hasn't been emitted
3827 * yet), without the variable in scope.
3829 * This differs from most C-like languages, but it follows the GLSL
3830 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3833 * "Within a declaration, the scope of a name starts immediately
3834 * after the initializer if present or immediately after the name
3835 * being declared if not."
3837 if (!state
->symbols
->add_variable(var
)) {
3838 YYLTYPE loc
= this->get_location();
3839 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3840 "current scope", decl
->identifier
);
3844 /* Push the variable declaration to the top. It means that all the
3845 * variable declarations will appear in a funny last-to-first order,
3846 * but otherwise we run into trouble if a function is prototyped, a
3847 * global var is decled, then the function is defined with usage of
3848 * the global var. See glslparsertest's CorrectModule.frag.
3850 instructions
->push_head(var
);
3853 instructions
->append_list(&initializer_instructions
);
3857 /* Generally, variable declarations do not have r-values. However,
3858 * one is used for the declaration in
3860 * while (bool b = some_condition()) {
3864 * so we return the rvalue from the last seen declaration here.
3871 ast_parameter_declarator::hir(exec_list
*instructions
,
3872 struct _mesa_glsl_parse_state
*state
)
3875 const struct glsl_type
*type
;
3876 const char *name
= NULL
;
3877 YYLTYPE loc
= this->get_location();
3879 type
= this->type
->glsl_type(& name
, state
);
3883 _mesa_glsl_error(& loc
, state
,
3884 "invalid type `%s' in declaration of `%s'",
3885 name
, this->identifier
);
3887 _mesa_glsl_error(& loc
, state
,
3888 "invalid type in declaration of `%s'",
3892 type
= glsl_type::error_type
;
3895 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3897 * "Functions that accept no input arguments need not use void in the
3898 * argument list because prototypes (or definitions) are required and
3899 * therefore there is no ambiguity when an empty argument list "( )" is
3900 * declared. The idiom "(void)" as a parameter list is provided for
3903 * Placing this check here prevents a void parameter being set up
3904 * for a function, which avoids tripping up checks for main taking
3905 * parameters and lookups of an unnamed symbol.
3907 if (type
->is_void()) {
3908 if (this->identifier
!= NULL
)
3909 _mesa_glsl_error(& loc
, state
,
3910 "named parameter cannot have type `void'");
3916 if (formal_parameter
&& (this->identifier
== NULL
)) {
3917 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3921 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3922 * call already handled the "vec4[..] foo" case.
3924 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
3926 if (!type
->is_error() && type
->is_unsized_array()) {
3927 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3929 type
= glsl_type::error_type
;
3933 ir_variable
*var
= new(ctx
)
3934 ir_variable(type
, this->identifier
, ir_var_function_in
);
3936 /* Apply any specified qualifiers to the parameter declaration. Note that
3937 * for function parameters the default mode is 'in'.
3939 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3942 /* From section 4.1.7 of the GLSL 4.40 spec:
3944 * "Opaque variables cannot be treated as l-values; hence cannot
3945 * be used as out or inout function parameters, nor can they be
3948 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
3949 && type
->contains_opaque()) {
3950 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
3951 "contain opaque variables");
3952 type
= glsl_type::error_type
;
3955 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3957 * "When calling a function, expressions that do not evaluate to
3958 * l-values cannot be passed to parameters declared as out or inout."
3960 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3962 * "Other binary or unary expressions, non-dereferenced arrays,
3963 * function names, swizzles with repeated fields, and constants
3964 * cannot be l-values."
3966 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3967 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3969 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
3971 && !state
->check_version(120, 100, &loc
,
3972 "arrays cannot be out or inout parameters")) {
3973 type
= glsl_type::error_type
;
3976 instructions
->push_tail(var
);
3978 /* Parameter declarations do not have r-values.
3985 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3987 exec_list
*ir_parameters
,
3988 _mesa_glsl_parse_state
*state
)
3990 ast_parameter_declarator
*void_param
= NULL
;
3993 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3994 param
->formal_parameter
= formal
;
3995 param
->hir(ir_parameters
, state
);
4003 if ((void_param
!= NULL
) && (count
> 1)) {
4004 YYLTYPE loc
= void_param
->get_location();
4006 _mesa_glsl_error(& loc
, state
,
4007 "`void' parameter must be only parameter");
4013 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
4015 /* IR invariants disallow function declarations or definitions
4016 * nested within other function definitions. But there is no
4017 * requirement about the relative order of function declarations
4018 * and definitions with respect to one another. So simply insert
4019 * the new ir_function block at the end of the toplevel instruction
4022 state
->toplevel_ir
->push_tail(f
);
4027 ast_function::hir(exec_list
*instructions
,
4028 struct _mesa_glsl_parse_state
*state
)
4031 ir_function
*f
= NULL
;
4032 ir_function_signature
*sig
= NULL
;
4033 exec_list hir_parameters
;
4035 const char *const name
= identifier
;
4037 /* New functions are always added to the top-level IR instruction stream,
4038 * so this instruction list pointer is ignored. See also emit_function
4041 (void) instructions
;
4043 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
4045 * "Function declarations (prototypes) cannot occur inside of functions;
4046 * they must be at global scope, or for the built-in functions, outside
4047 * the global scope."
4049 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
4051 * "User defined functions may only be defined within the global scope."
4053 * Note that this language does not appear in GLSL 1.10.
4055 if ((state
->current_function
!= NULL
) &&
4056 state
->is_version(120, 100)) {
4057 YYLTYPE loc
= this->get_location();
4058 _mesa_glsl_error(&loc
, state
,
4059 "declaration of function `%s' not allowed within "
4060 "function body", name
);
4063 validate_identifier(name
, this->get_location(), state
);
4065 /* Convert the list of function parameters to HIR now so that they can be
4066 * used below to compare this function's signature with previously seen
4067 * signatures for functions with the same name.
4069 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
4071 & hir_parameters
, state
);
4073 const char *return_type_name
;
4074 const glsl_type
*return_type
=
4075 this->return_type
->glsl_type(& return_type_name
, state
);
4078 YYLTYPE loc
= this->get_location();
4079 _mesa_glsl_error(&loc
, state
,
4080 "function `%s' has undeclared return type `%s'",
4081 name
, return_type_name
);
4082 return_type
= glsl_type::error_type
;
4085 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
4086 * "No qualifier is allowed on the return type of a function."
4088 if (this->return_type
->has_qualifiers()) {
4089 YYLTYPE loc
= this->get_location();
4090 _mesa_glsl_error(& loc
, state
,
4091 "function `%s' return type has qualifiers", name
);
4094 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
4096 * "Arrays are allowed as arguments and as the return type. In both
4097 * cases, the array must be explicitly sized."
4099 if (return_type
->is_unsized_array()) {
4100 YYLTYPE loc
= this->get_location();
4101 _mesa_glsl_error(& loc
, state
,
4102 "function `%s' return type array must be explicitly "
4106 /* From section 4.1.7 of the GLSL 4.40 spec:
4108 * "[Opaque types] can only be declared as function parameters
4109 * or uniform-qualified variables."
4111 if (return_type
->contains_opaque()) {
4112 YYLTYPE loc
= this->get_location();
4113 _mesa_glsl_error(&loc
, state
,
4114 "function `%s' return type can't contain an opaque type",
4118 /* Create an ir_function if one doesn't already exist. */
4119 f
= state
->symbols
->get_function(name
);
4121 f
= new(ctx
) ir_function(name
);
4122 if (!state
->symbols
->add_function(f
)) {
4123 /* This function name shadows a non-function use of the same name. */
4124 YYLTYPE loc
= this->get_location();
4126 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
4127 "non-function", name
);
4131 emit_function(state
, f
);
4134 /* Verify that this function's signature either doesn't match a previously
4135 * seen signature for a function with the same name, or, if a match is found,
4136 * that the previously seen signature does not have an associated definition.
4138 if (state
->es_shader
|| f
->has_user_signature()) {
4139 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
4141 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
4142 if (badvar
!= NULL
) {
4143 YYLTYPE loc
= this->get_location();
4145 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
4146 "qualifiers don't match prototype", name
, badvar
);
4149 if (sig
->return_type
!= return_type
) {
4150 YYLTYPE loc
= this->get_location();
4152 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
4153 "match prototype", name
);
4156 if (sig
->is_defined
) {
4157 if (is_definition
) {
4158 YYLTYPE loc
= this->get_location();
4159 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
4161 /* We just encountered a prototype that exactly matches a
4162 * function that's already been defined. This is redundant,
4163 * and we should ignore it.
4171 /* Verify the return type of main() */
4172 if (strcmp(name
, "main") == 0) {
4173 if (! return_type
->is_void()) {
4174 YYLTYPE loc
= this->get_location();
4176 _mesa_glsl_error(& loc
, state
, "main() must return void");
4179 if (!hir_parameters
.is_empty()) {
4180 YYLTYPE loc
= this->get_location();
4182 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
4186 /* Finish storing the information about this new function in its signature.
4189 sig
= new(ctx
) ir_function_signature(return_type
);
4190 f
->add_signature(sig
);
4193 sig
->replace_parameters(&hir_parameters
);
4196 /* Function declarations (prototypes) do not have r-values.
4203 ast_function_definition::hir(exec_list
*instructions
,
4204 struct _mesa_glsl_parse_state
*state
)
4206 prototype
->is_definition
= true;
4207 prototype
->hir(instructions
, state
);
4209 ir_function_signature
*signature
= prototype
->signature
;
4210 if (signature
== NULL
)
4213 assert(state
->current_function
== NULL
);
4214 state
->current_function
= signature
;
4215 state
->found_return
= false;
4217 /* Duplicate parameters declared in the prototype as concrete variables.
4218 * Add these to the symbol table.
4220 state
->symbols
->push_scope();
4221 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
4222 assert(var
->as_variable() != NULL
);
4224 /* The only way a parameter would "exist" is if two parameters have
4227 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
4228 YYLTYPE loc
= this->get_location();
4230 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
4232 state
->symbols
->add_variable(var
);
4236 /* Convert the body of the function to HIR. */
4237 this->body
->hir(&signature
->body
, state
);
4238 signature
->is_defined
= true;
4240 state
->symbols
->pop_scope();
4242 assert(state
->current_function
== signature
);
4243 state
->current_function
= NULL
;
4245 if (!signature
->return_type
->is_void() && !state
->found_return
) {
4246 YYLTYPE loc
= this->get_location();
4247 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
4248 "%s, but no return statement",
4249 signature
->function_name(),
4250 signature
->return_type
->name
);
4253 /* Function definitions do not have r-values.
4260 ast_jump_statement::hir(exec_list
*instructions
,
4261 struct _mesa_glsl_parse_state
*state
)
4268 assert(state
->current_function
);
4270 if (opt_return_value
) {
4271 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
4273 /* The value of the return type can be NULL if the shader says
4274 * 'return foo();' and foo() is a function that returns void.
4276 * NOTE: The GLSL spec doesn't say that this is an error. The type
4277 * of the return value is void. If the return type of the function is
4278 * also void, then this should compile without error. Seriously.
4280 const glsl_type
*const ret_type
=
4281 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
4283 /* Implicit conversions are not allowed for return values prior to
4284 * ARB_shading_language_420pack.
4286 if (state
->current_function
->return_type
!= ret_type
) {
4287 YYLTYPE loc
= this->get_location();
4289 if (state
->ARB_shading_language_420pack_enable
) {
4290 if (!apply_implicit_conversion(state
->current_function
->return_type
,
4292 _mesa_glsl_error(& loc
, state
,
4293 "could not implicitly convert return value "
4294 "to %s, in function `%s'",
4295 state
->current_function
->return_type
->name
,
4296 state
->current_function
->function_name());
4299 _mesa_glsl_error(& loc
, state
,
4300 "`return' with wrong type %s, in function `%s' "
4303 state
->current_function
->function_name(),
4304 state
->current_function
->return_type
->name
);
4306 } else if (state
->current_function
->return_type
->base_type
==
4308 YYLTYPE loc
= this->get_location();
4310 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
4311 * specs add a clarification:
4313 * "A void function can only use return without a return argument, even if
4314 * the return argument has void type. Return statements only accept values:
4317 * void func2() { return func1(); } // illegal return statement"
4319 _mesa_glsl_error(& loc
, state
,
4320 "void functions can only use `return' without a "
4324 inst
= new(ctx
) ir_return(ret
);
4326 if (state
->current_function
->return_type
->base_type
!=
4328 YYLTYPE loc
= this->get_location();
4330 _mesa_glsl_error(& loc
, state
,
4331 "`return' with no value, in function %s returning "
4333 state
->current_function
->function_name());
4335 inst
= new(ctx
) ir_return
;
4338 state
->found_return
= true;
4339 instructions
->push_tail(inst
);
4344 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
4345 YYLTYPE loc
= this->get_location();
4347 _mesa_glsl_error(& loc
, state
,
4348 "`discard' may only appear in a fragment shader");
4350 instructions
->push_tail(new(ctx
) ir_discard
);
4355 if (mode
== ast_continue
&&
4356 state
->loop_nesting_ast
== NULL
) {
4357 YYLTYPE loc
= this->get_location();
4359 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
4360 } else if (mode
== ast_break
&&
4361 state
->loop_nesting_ast
== NULL
&&
4362 state
->switch_state
.switch_nesting_ast
== NULL
) {
4363 YYLTYPE loc
= this->get_location();
4365 _mesa_glsl_error(& loc
, state
,
4366 "break may only appear in a loop or a switch");
4368 /* For a loop, inline the for loop expression again, since we don't
4369 * know where near the end of the loop body the normal copy of it is
4370 * going to be placed. Same goes for the condition for a do-while
4373 if (state
->loop_nesting_ast
!= NULL
&&
4374 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
4375 if (state
->loop_nesting_ast
->rest_expression
) {
4376 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
4379 if (state
->loop_nesting_ast
->mode
==
4380 ast_iteration_statement::ast_do_while
) {
4381 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
4385 if (state
->switch_state
.is_switch_innermost
&&
4386 mode
== ast_continue
) {
4387 /* Set 'continue_inside' to true. */
4388 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
4389 ir_dereference_variable
*deref_continue_inside_var
=
4390 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
4391 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
4394 /* Break out from the switch, continue for the loop will
4395 * be called right after switch. */
4396 ir_loop_jump
*const jump
=
4397 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4398 instructions
->push_tail(jump
);
4400 } else if (state
->switch_state
.is_switch_innermost
&&
4401 mode
== ast_break
) {
4402 /* Force break out of switch by inserting a break. */
4403 ir_loop_jump
*const jump
=
4404 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4405 instructions
->push_tail(jump
);
4407 ir_loop_jump
*const jump
=
4408 new(ctx
) ir_loop_jump((mode
== ast_break
)
4409 ? ir_loop_jump::jump_break
4410 : ir_loop_jump::jump_continue
);
4411 instructions
->push_tail(jump
);
4418 /* Jump instructions do not have r-values.
4425 ast_selection_statement::hir(exec_list
*instructions
,
4426 struct _mesa_glsl_parse_state
*state
)
4430 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
4432 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
4434 * "Any expression whose type evaluates to a Boolean can be used as the
4435 * conditional expression bool-expression. Vector types are not accepted
4436 * as the expression to if."
4438 * The checks are separated so that higher quality diagnostics can be
4439 * generated for cases where both rules are violated.
4441 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
4442 YYLTYPE loc
= this->condition
->get_location();
4444 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
4448 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
4450 if (then_statement
!= NULL
) {
4451 state
->symbols
->push_scope();
4452 then_statement
->hir(& stmt
->then_instructions
, state
);
4453 state
->symbols
->pop_scope();
4456 if (else_statement
!= NULL
) {
4457 state
->symbols
->push_scope();
4458 else_statement
->hir(& stmt
->else_instructions
, state
);
4459 state
->symbols
->pop_scope();
4462 instructions
->push_tail(stmt
);
4464 /* if-statements do not have r-values.
4471 ast_switch_statement::hir(exec_list
*instructions
,
4472 struct _mesa_glsl_parse_state
*state
)
4476 ir_rvalue
*const test_expression
=
4477 this->test_expression
->hir(instructions
, state
);
4479 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
4481 * "The type of init-expression in a switch statement must be a
4484 if (!test_expression
->type
->is_scalar() ||
4485 !test_expression
->type
->is_integer()) {
4486 YYLTYPE loc
= this->test_expression
->get_location();
4488 _mesa_glsl_error(& loc
,
4490 "switch-statement expression must be scalar "
4494 /* Track the switch-statement nesting in a stack-like manner.
4496 struct glsl_switch_state saved
= state
->switch_state
;
4498 state
->switch_state
.is_switch_innermost
= true;
4499 state
->switch_state
.switch_nesting_ast
= this;
4500 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
4501 hash_table_pointer_compare
);
4502 state
->switch_state
.previous_default
= NULL
;
4504 /* Initalize is_fallthru state to false.
4506 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
4507 state
->switch_state
.is_fallthru_var
=
4508 new(ctx
) ir_variable(glsl_type::bool_type
,
4509 "switch_is_fallthru_tmp",
4511 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
4513 ir_dereference_variable
*deref_is_fallthru_var
=
4514 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4515 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
4518 /* Initialize continue_inside state to false.
4520 state
->switch_state
.continue_inside
=
4521 new(ctx
) ir_variable(glsl_type::bool_type
,
4522 "continue_inside_tmp",
4524 instructions
->push_tail(state
->switch_state
.continue_inside
);
4526 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
4527 ir_dereference_variable
*deref_continue_inside_var
=
4528 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
4529 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
4532 state
->switch_state
.run_default
=
4533 new(ctx
) ir_variable(glsl_type::bool_type
,
4536 instructions
->push_tail(state
->switch_state
.run_default
);
4538 /* Loop around the switch is used for flow control. */
4539 ir_loop
* loop
= new(ctx
) ir_loop();
4540 instructions
->push_tail(loop
);
4542 /* Cache test expression.
4544 test_to_hir(&loop
->body_instructions
, state
);
4546 /* Emit code for body of switch stmt.
4548 body
->hir(&loop
->body_instructions
, state
);
4550 /* Insert a break at the end to exit loop. */
4551 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4552 loop
->body_instructions
.push_tail(jump
);
4554 /* If we are inside loop, check if continue got called inside switch. */
4555 if (state
->loop_nesting_ast
!= NULL
) {
4556 ir_dereference_variable
*deref_continue_inside
=
4557 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
4558 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
4559 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
4561 if (state
->loop_nesting_ast
!= NULL
) {
4562 if (state
->loop_nesting_ast
->rest_expression
) {
4563 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
4566 if (state
->loop_nesting_ast
->mode
==
4567 ast_iteration_statement::ast_do_while
) {
4568 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
4571 irif
->then_instructions
.push_tail(jump
);
4572 instructions
->push_tail(irif
);
4575 hash_table_dtor(state
->switch_state
.labels_ht
);
4577 state
->switch_state
= saved
;
4579 /* Switch statements do not have r-values. */
4585 ast_switch_statement::test_to_hir(exec_list
*instructions
,
4586 struct _mesa_glsl_parse_state
*state
)
4590 /* Cache value of test expression. */
4591 ir_rvalue
*const test_val
=
4592 test_expression
->hir(instructions
,
4595 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
4598 ir_dereference_variable
*deref_test_var
=
4599 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4601 instructions
->push_tail(state
->switch_state
.test_var
);
4602 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
4607 ast_switch_body::hir(exec_list
*instructions
,
4608 struct _mesa_glsl_parse_state
*state
)
4611 stmts
->hir(instructions
, state
);
4613 /* Switch bodies do not have r-values. */
4618 ast_case_statement_list::hir(exec_list
*instructions
,
4619 struct _mesa_glsl_parse_state
*state
)
4621 exec_list default_case
, after_default
, tmp
;
4623 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
4624 case_stmt
->hir(&tmp
, state
);
4627 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
4628 default_case
.append_list(&tmp
);
4632 /* If default case found, append 'after_default' list. */
4633 if (!default_case
.is_empty())
4634 after_default
.append_list(&tmp
);
4636 instructions
->append_list(&tmp
);
4639 /* Handle the default case. This is done here because default might not be
4640 * the last case. We need to add checks against following cases first to see
4641 * if default should be chosen or not.
4643 if (!default_case
.is_empty()) {
4645 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
4646 ir_dereference_variable
*deref_run_default_var
=
4647 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
4649 /* Choose to run default case initially, following conditional
4650 * assignments might change this.
4652 ir_assignment
*const init_var
=
4653 new(state
) ir_assignment(deref_run_default_var
, true_val
);
4654 instructions
->push_tail(init_var
);
4656 /* Default case was the last one, no checks required. */
4657 if (after_default
.is_empty()) {
4658 instructions
->append_list(&default_case
);
4662 foreach_in_list(ir_instruction
, ir
, &after_default
) {
4663 ir_assignment
*assign
= ir
->as_assignment();
4668 /* Clone the check between case label and init expression. */
4669 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
4670 ir_expression
*clone
= exp
->clone(state
, NULL
);
4672 ir_dereference_variable
*deref_var
=
4673 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
4674 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
4676 ir_assignment
*const set_false
=
4677 new(state
) ir_assignment(deref_var
, false_val
, clone
);
4679 instructions
->push_tail(set_false
);
4682 /* Append default case and all cases after it. */
4683 instructions
->append_list(&default_case
);
4684 instructions
->append_list(&after_default
);
4687 /* Case statements do not have r-values. */
4692 ast_case_statement::hir(exec_list
*instructions
,
4693 struct _mesa_glsl_parse_state
*state
)
4695 labels
->hir(instructions
, state
);
4697 /* Guard case statements depending on fallthru state. */
4698 ir_dereference_variable
*const deref_fallthru_guard
=
4699 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4700 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
4702 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
4703 stmt
->hir(& test_fallthru
->then_instructions
, state
);
4705 instructions
->push_tail(test_fallthru
);
4707 /* Case statements do not have r-values. */
4713 ast_case_label_list::hir(exec_list
*instructions
,
4714 struct _mesa_glsl_parse_state
*state
)
4716 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
4717 label
->hir(instructions
, state
);
4719 /* Case labels do not have r-values. */
4724 ast_case_label::hir(exec_list
*instructions
,
4725 struct _mesa_glsl_parse_state
*state
)
4729 ir_dereference_variable
*deref_fallthru_var
=
4730 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4732 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
4734 /* If not default case, ... */
4735 if (this->test_value
!= NULL
) {
4736 /* Conditionally set fallthru state based on
4737 * comparison of cached test expression value to case label.
4739 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
4740 ir_constant
*label_const
= label_rval
->constant_expression_value();
4743 YYLTYPE loc
= this->test_value
->get_location();
4745 _mesa_glsl_error(& loc
, state
,
4746 "switch statement case label must be a "
4747 "constant expression");
4749 /* Stuff a dummy value in to allow processing to continue. */
4750 label_const
= new(ctx
) ir_constant(0);
4752 ast_expression
*previous_label
= (ast_expression
*)
4753 hash_table_find(state
->switch_state
.labels_ht
,
4754 (void *)(uintptr_t)label_const
->value
.u
[0]);
4756 if (previous_label
) {
4757 YYLTYPE loc
= this->test_value
->get_location();
4758 _mesa_glsl_error(& loc
, state
, "duplicate case value");
4760 loc
= previous_label
->get_location();
4761 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
4763 hash_table_insert(state
->switch_state
.labels_ht
,
4765 (void *)(uintptr_t)label_const
->value
.u
[0]);
4769 ir_dereference_variable
*deref_test_var
=
4770 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4772 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4777 * From GLSL 4.40 specification section 6.2 ("Selection"):
4779 * "The type of the init-expression value in a switch statement must
4780 * be a scalar int or uint. The type of the constant-expression value
4781 * in a case label also must be a scalar int or uint. When any pair
4782 * of these values is tested for "equal value" and the types do not
4783 * match, an implicit conversion will be done to convert the int to a
4784 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
4787 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
4788 YYLTYPE loc
= this->test_value
->get_location();
4790 const glsl_type
*type_a
= label_const
->type
;
4791 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
4793 /* Check if int->uint implicit conversion is supported. */
4794 bool integer_conversion_supported
=
4795 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
4798 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
4799 !integer_conversion_supported
) {
4800 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
4801 "init-expression and case label (%s != %s)",
4802 type_a
->name
, type_b
->name
);
4804 /* Conversion of the case label. */
4805 if (type_a
->base_type
== GLSL_TYPE_INT
) {
4806 if (!apply_implicit_conversion(glsl_type::uint_type
,
4807 test_cond
->operands
[0], state
))
4808 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
4810 /* Conversion of the init-expression value. */
4811 if (!apply_implicit_conversion(glsl_type::uint_type
,
4812 test_cond
->operands
[1], state
))
4813 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
4818 ir_assignment
*set_fallthru_on_test
=
4819 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
4821 instructions
->push_tail(set_fallthru_on_test
);
4822 } else { /* default case */
4823 if (state
->switch_state
.previous_default
) {
4824 YYLTYPE loc
= this->get_location();
4825 _mesa_glsl_error(& loc
, state
,
4826 "multiple default labels in one switch");
4828 loc
= state
->switch_state
.previous_default
->get_location();
4829 _mesa_glsl_error(& loc
, state
, "this is the first default label");
4831 state
->switch_state
.previous_default
= this;
4833 /* Set fallthru condition on 'run_default' bool. */
4834 ir_dereference_variable
*deref_run_default
=
4835 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
4836 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
4837 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4841 /* Set falltrhu state. */
4842 ir_assignment
*set_fallthru
=
4843 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
4845 instructions
->push_tail(set_fallthru
);
4848 /* Case statements do not have r-values. */
4853 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
4854 struct _mesa_glsl_parse_state
*state
)
4858 if (condition
!= NULL
) {
4859 ir_rvalue
*const cond
=
4860 condition
->hir(instructions
, state
);
4863 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
4864 YYLTYPE loc
= condition
->get_location();
4866 _mesa_glsl_error(& loc
, state
,
4867 "loop condition must be scalar boolean");
4869 /* As the first code in the loop body, generate a block that looks
4870 * like 'if (!condition) break;' as the loop termination condition.
4872 ir_rvalue
*const not_cond
=
4873 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
4875 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
4877 ir_jump
*const break_stmt
=
4878 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4880 if_stmt
->then_instructions
.push_tail(break_stmt
);
4881 instructions
->push_tail(if_stmt
);
4888 ast_iteration_statement::hir(exec_list
*instructions
,
4889 struct _mesa_glsl_parse_state
*state
)
4893 /* For-loops and while-loops start a new scope, but do-while loops do not.
4895 if (mode
!= ast_do_while
)
4896 state
->symbols
->push_scope();
4898 if (init_statement
!= NULL
)
4899 init_statement
->hir(instructions
, state
);
4901 ir_loop
*const stmt
= new(ctx
) ir_loop();
4902 instructions
->push_tail(stmt
);
4904 /* Track the current loop nesting. */
4905 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
4907 state
->loop_nesting_ast
= this;
4909 /* Likewise, indicate that following code is closest to a loop,
4910 * NOT closest to a switch.
4912 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
4913 state
->switch_state
.is_switch_innermost
= false;
4915 if (mode
!= ast_do_while
)
4916 condition_to_hir(&stmt
->body_instructions
, state
);
4919 body
->hir(& stmt
->body_instructions
, state
);
4921 if (rest_expression
!= NULL
)
4922 rest_expression
->hir(& stmt
->body_instructions
, state
);
4924 if (mode
== ast_do_while
)
4925 condition_to_hir(&stmt
->body_instructions
, state
);
4927 if (mode
!= ast_do_while
)
4928 state
->symbols
->pop_scope();
4930 /* Restore previous nesting before returning. */
4931 state
->loop_nesting_ast
= nesting_ast
;
4932 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
4934 /* Loops do not have r-values.
4941 * Determine if the given type is valid for establishing a default precision
4944 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4946 * "The precision statement
4948 * precision precision-qualifier type;
4950 * can be used to establish a default precision qualifier. The type field
4951 * can be either int or float or any of the sampler types, and the
4952 * precision-qualifier can be lowp, mediump, or highp."
4954 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4955 * qualifiers on sampler types, but this seems like an oversight (since the
4956 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4957 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4961 is_valid_default_precision_type(const struct glsl_type
*const type
)
4966 switch (type
->base_type
) {
4968 case GLSL_TYPE_FLOAT
:
4969 /* "int" and "float" are valid, but vectors and matrices are not. */
4970 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4971 case GLSL_TYPE_SAMPLER
:
4980 ast_type_specifier::hir(exec_list
*instructions
,
4981 struct _mesa_glsl_parse_state
*state
)
4983 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
4986 YYLTYPE loc
= this->get_location();
4988 /* If this is a precision statement, check that the type to which it is
4989 * applied is either float or int.
4991 * From section 4.5.3 of the GLSL 1.30 spec:
4992 * "The precision statement
4993 * precision precision-qualifier type;
4994 * can be used to establish a default precision qualifier. The type
4995 * field can be either int or float [...]. Any other types or
4996 * qualifiers will result in an error.
4998 if (this->default_precision
!= ast_precision_none
) {
4999 if (!state
->check_precision_qualifiers_allowed(&loc
))
5002 if (this->structure
!= NULL
) {
5003 _mesa_glsl_error(&loc
, state
,
5004 "precision qualifiers do not apply to structures");
5008 if (this->array_specifier
!= NULL
) {
5009 _mesa_glsl_error(&loc
, state
,
5010 "default precision statements do not apply to "
5015 const struct glsl_type
*const type
=
5016 state
->symbols
->get_type(this->type_name
);
5017 if (!is_valid_default_precision_type(type
)) {
5018 _mesa_glsl_error(&loc
, state
,
5019 "default precision statements apply only to "
5020 "float, int, and sampler types");
5024 if (type
->base_type
== GLSL_TYPE_FLOAT
5026 && state
->stage
== MESA_SHADER_FRAGMENT
) {
5027 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
5030 * "The fragment language has no default precision qualifier for
5031 * floating point types."
5033 * As a result, we have to track whether or not default precision has
5034 * been specified for float in GLSL ES fragment shaders.
5036 * Earlier in that same section, the spec says:
5038 * "Non-precision qualified declarations will use the precision
5039 * qualifier specified in the most recent precision statement
5040 * that is still in scope. The precision statement has the same
5041 * scoping rules as variable declarations. If it is declared
5042 * inside a compound statement, its effect stops at the end of
5043 * the innermost statement it was declared in. Precision
5044 * statements in nested scopes override precision statements in
5045 * outer scopes. Multiple precision statements for the same basic
5046 * type can appear inside the same scope, with later statements
5047 * overriding earlier statements within that scope."
5049 * Default precision specifications follow the same scope rules as
5050 * variables. So, we can track the state of the default float
5051 * precision in the symbol table, and the rules will just work. This
5052 * is a slight abuse of the symbol table, but it has the semantics
5055 ir_variable
*const junk
=
5056 new(state
) ir_variable(type
, "#default precision",
5059 state
->symbols
->add_variable(junk
);
5062 /* FINISHME: Translate precision statements into IR. */
5066 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
5067 * process_record_constructor() can do type-checking on C-style initializer
5068 * expressions of structs, but ast_struct_specifier should only be translated
5069 * to HIR if it is declaring the type of a structure.
5071 * The ->is_declaration field is false for initializers of variables
5072 * declared separately from the struct's type definition.
5074 * struct S { ... }; (is_declaration = true)
5075 * struct T { ... } t = { ... }; (is_declaration = true)
5076 * S s = { ... }; (is_declaration = false)
5078 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
5079 return this->structure
->hir(instructions
, state
);
5086 * Process a structure or interface block tree into an array of structure fields
5088 * After parsing, where there are some syntax differnces, structures and
5089 * interface blocks are almost identical. They are similar enough that the
5090 * AST for each can be processed the same way into a set of
5091 * \c glsl_struct_field to describe the members.
5093 * If we're processing an interface block, var_mode should be the type of the
5094 * interface block (ir_var_shader_in, ir_var_shader_out, or ir_var_uniform).
5095 * If we're processing a structure, var_mode should be ir_var_auto.
5098 * The number of fields processed. A pointer to the array structure fields is
5099 * stored in \c *fields_ret.
5102 ast_process_structure_or_interface_block(exec_list
*instructions
,
5103 struct _mesa_glsl_parse_state
*state
,
5104 exec_list
*declarations
,
5106 glsl_struct_field
**fields_ret
,
5108 enum glsl_matrix_layout matrix_layout
,
5109 bool allow_reserved_names
,
5110 ir_variable_mode var_mode
)
5112 unsigned decl_count
= 0;
5114 /* Make an initial pass over the list of fields to determine how
5115 * many there are. Each element in this list is an ast_declarator_list.
5116 * This means that we actually need to count the number of elements in the
5117 * 'declarations' list in each of the elements.
5119 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
5120 decl_count
+= decl_list
->declarations
.length();
5123 /* Allocate storage for the fields and process the field
5124 * declarations. As the declarations are processed, try to also convert
5125 * the types to HIR. This ensures that structure definitions embedded in
5126 * other structure definitions or in interface blocks are processed.
5128 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
5132 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
5133 const char *type_name
;
5135 decl_list
->type
->specifier
->hir(instructions
, state
);
5137 /* Section 10.9 of the GLSL ES 1.00 specification states that
5138 * embedded structure definitions have been removed from the language.
5140 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
5141 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
5142 "not allowed in GLSL ES 1.00");
5145 const glsl_type
*decl_type
=
5146 decl_list
->type
->glsl_type(& type_name
, state
);
5148 foreach_list_typed (ast_declaration
, decl
, link
,
5149 &decl_list
->declarations
) {
5150 if (!allow_reserved_names
)
5151 validate_identifier(decl
->identifier
, loc
, state
);
5153 /* From section 4.3.9 of the GLSL 4.40 spec:
5155 * "[In interface blocks] opaque types are not allowed."
5157 * It should be impossible for decl_type to be NULL here. Cases that
5158 * might naturally lead to decl_type being NULL, especially for the
5159 * is_interface case, will have resulted in compilation having
5160 * already halted due to a syntax error.
5162 const struct glsl_type
*field_type
=
5163 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
5165 if (is_interface
&& field_type
->contains_opaque()) {
5166 YYLTYPE loc
= decl_list
->get_location();
5167 _mesa_glsl_error(&loc
, state
,
5168 "uniform in non-default uniform block contains "
5172 if (field_type
->contains_atomic()) {
5173 /* FINISHME: Add a spec quotation here once updated spec
5174 * FINISHME: language is available. See Khronos bug #10903
5175 * FINISHME: on whether atomic counters are allowed in
5176 * FINISHME: structures.
5178 YYLTYPE loc
= decl_list
->get_location();
5179 _mesa_glsl_error(&loc
, state
, "atomic counter in structure or "
5183 if (field_type
->contains_image()) {
5184 /* FINISHME: Same problem as with atomic counters.
5185 * FINISHME: Request clarification from Khronos and add
5186 * FINISHME: spec quotation here.
5188 YYLTYPE loc
= decl_list
->get_location();
5189 _mesa_glsl_error(&loc
, state
,
5190 "image in structure or uniform block");
5193 const struct ast_type_qualifier
*const qual
=
5194 & decl_list
->type
->qualifier
;
5195 if (qual
->flags
.q
.std140
||
5196 qual
->flags
.q
.packed
||
5197 qual
->flags
.q
.shared
) {
5198 _mesa_glsl_error(&loc
, state
,
5199 "uniform block layout qualifiers std140, packed, and "
5200 "shared can only be applied to uniform blocks, not "
5204 if (qual
->flags
.q
.constant
) {
5205 YYLTYPE loc
= decl_list
->get_location();
5206 _mesa_glsl_error(&loc
, state
,
5207 "const storage qualifier cannot be applied "
5208 "to struct or interface block members");
5211 field_type
= process_array_type(&loc
, decl_type
,
5212 decl
->array_specifier
, state
);
5213 fields
[i
].type
= field_type
;
5214 fields
[i
].name
= decl
->identifier
;
5215 fields
[i
].location
= -1;
5216 fields
[i
].interpolation
=
5217 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
5218 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
5219 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
5221 /* Only save explicitly defined streams in block's field */
5222 fields
[i
].stream
= qual
->flags
.q
.explicit_stream
? qual
->stream
: -1;
5224 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
5225 if (!qual
->flags
.q
.uniform
) {
5226 _mesa_glsl_error(&loc
, state
,
5227 "row_major and column_major can only be "
5228 "applied to uniform interface blocks");
5230 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
5233 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
5234 _mesa_glsl_error(&loc
, state
,
5235 "interpolation qualifiers cannot be used "
5236 "with uniform interface blocks");
5239 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
5240 qual
->has_auxiliary_storage()) {
5241 _mesa_glsl_error(&loc
, state
,
5242 "auxiliary storage qualifiers cannot be used "
5243 "in uniform blocks or structures.");
5246 /* Propogate row- / column-major information down the fields of the
5247 * structure or interface block. Structures need this data because
5248 * the structure may contain a structure that contains ... a matrix
5249 * that need the proper layout.
5251 if (field_type
->without_array()->is_matrix()
5252 || field_type
->without_array()->is_record()) {
5253 /* If no layout is specified for the field, inherit the layout
5256 fields
[i
].matrix_layout
= matrix_layout
;
5258 if (qual
->flags
.q
.row_major
)
5259 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
5260 else if (qual
->flags
.q
.column_major
)
5261 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
5263 /* If we're processing an interface block, the matrix layout must
5264 * be decided by this point.
5266 assert(!is_interface
5267 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
5268 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
5275 assert(i
== decl_count
);
5277 *fields_ret
= fields
;
5283 ast_struct_specifier::hir(exec_list
*instructions
,
5284 struct _mesa_glsl_parse_state
*state
)
5286 YYLTYPE loc
= this->get_location();
5288 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
5290 * "Anonymous structures are not supported; so embedded structures must
5291 * have a declarator. A name given to an embedded struct is scoped at
5292 * the same level as the struct it is embedded in."
5294 * The same section of the GLSL 1.20 spec says:
5296 * "Anonymous structures are not supported. Embedded structures are not
5299 * struct S { float f; };
5301 * S; // Error: anonymous structures disallowed
5302 * struct { ... }; // Error: embedded structures disallowed
5303 * S s; // Okay: nested structures with name are allowed
5306 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
5307 * we allow embedded structures in 1.10 only.
5309 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
5310 _mesa_glsl_error(&loc
, state
,
5311 "embedded structure declarations are not allowed");
5313 state
->struct_specifier_depth
++;
5315 glsl_struct_field
*fields
;
5316 unsigned decl_count
=
5317 ast_process_structure_or_interface_block(instructions
,
5319 &this->declarations
,
5323 GLSL_MATRIX_LAYOUT_INHERITED
,
5324 false /* allow_reserved_names */,
5327 validate_identifier(this->name
, loc
, state
);
5329 const glsl_type
*t
=
5330 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
5332 if (!state
->symbols
->add_type(name
, t
)) {
5333 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
5335 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
5337 state
->num_user_structures
+ 1);
5339 s
[state
->num_user_structures
] = t
;
5340 state
->user_structures
= s
;
5341 state
->num_user_structures
++;
5345 state
->struct_specifier_depth
--;
5347 /* Structure type definitions do not have r-values.
5354 * Visitor class which detects whether a given interface block has been used.
5356 class interface_block_usage_visitor
: public ir_hierarchical_visitor
5359 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
5360 : mode(mode
), block(block
), found(false)
5364 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
5366 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
5370 return visit_continue
;
5373 bool usage_found() const
5379 ir_variable_mode mode
;
5380 const glsl_type
*block
;
5386 ast_interface_block::hir(exec_list
*instructions
,
5387 struct _mesa_glsl_parse_state
*state
)
5389 YYLTYPE loc
= this->get_location();
5391 /* Interface blocks must be declared at global scope */
5392 if (state
->current_function
!= NULL
) {
5393 _mesa_glsl_error(&loc
, state
,
5394 "Interface block `%s' must be declared "
5399 /* The ast_interface_block has a list of ast_declarator_lists. We
5400 * need to turn those into ir_variables with an association
5401 * with this uniform block.
5403 enum glsl_interface_packing packing
;
5404 if (this->layout
.flags
.q
.shared
) {
5405 packing
= GLSL_INTERFACE_PACKING_SHARED
;
5406 } else if (this->layout
.flags
.q
.packed
) {
5407 packing
= GLSL_INTERFACE_PACKING_PACKED
;
5409 /* The default layout is std140.
5411 packing
= GLSL_INTERFACE_PACKING_STD140
;
5414 ir_variable_mode var_mode
;
5415 const char *iface_type_name
;
5416 if (this->layout
.flags
.q
.in
) {
5417 var_mode
= ir_var_shader_in
;
5418 iface_type_name
= "in";
5419 } else if (this->layout
.flags
.q
.out
) {
5420 var_mode
= ir_var_shader_out
;
5421 iface_type_name
= "out";
5422 } else if (this->layout
.flags
.q
.uniform
) {
5423 var_mode
= ir_var_uniform
;
5424 iface_type_name
= "uniform";
5426 var_mode
= ir_var_auto
;
5427 iface_type_name
= "UNKNOWN";
5428 assert(!"interface block layout qualifier not found!");
5431 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
5432 if (this->layout
.flags
.q
.row_major
)
5433 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
5434 else if (this->layout
.flags
.q
.column_major
)
5435 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
5437 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
5438 exec_list declared_variables
;
5439 glsl_struct_field
*fields
;
5441 /* Treat an interface block as one level of nesting, so that embedded struct
5442 * specifiers will be disallowed.
5444 state
->struct_specifier_depth
++;
5446 unsigned int num_variables
=
5447 ast_process_structure_or_interface_block(&declared_variables
,
5449 &this->declarations
,
5454 redeclaring_per_vertex
,
5457 state
->struct_specifier_depth
--;
5459 if (!redeclaring_per_vertex
) {
5460 validate_identifier(this->block_name
, loc
, state
);
5462 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
5464 * "Block names have no other use within a shader beyond interface
5465 * matching; it is a compile-time error to use a block name at global
5466 * scope for anything other than as a block name."
5468 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
5469 if (var
&& !var
->type
->is_interface()) {
5470 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
5471 "already used in the scope.",
5476 const glsl_type
*earlier_per_vertex
= NULL
;
5477 if (redeclaring_per_vertex
) {
5478 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
5479 * the named interface block gl_in, we can find it by looking at the
5480 * previous declaration of gl_in. Otherwise we can find it by looking
5481 * at the previous decalartion of any of the built-in outputs,
5484 * Also check that the instance name and array-ness of the redeclaration
5488 case ir_var_shader_in
:
5489 if (ir_variable
*earlier_gl_in
=
5490 state
->symbols
->get_variable("gl_in")) {
5491 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
5493 _mesa_glsl_error(&loc
, state
,
5494 "redeclaration of gl_PerVertex input not allowed "
5496 _mesa_shader_stage_to_string(state
->stage
));
5498 if (this->instance_name
== NULL
||
5499 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
) {
5500 _mesa_glsl_error(&loc
, state
,
5501 "gl_PerVertex input must be redeclared as "
5505 case ir_var_shader_out
:
5506 if (ir_variable
*earlier_gl_Position
=
5507 state
->symbols
->get_variable("gl_Position")) {
5508 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
5510 _mesa_glsl_error(&loc
, state
,
5511 "redeclaration of gl_PerVertex output not "
5512 "allowed in the %s shader",
5513 _mesa_shader_stage_to_string(state
->stage
));
5515 if (this->instance_name
!= NULL
) {
5516 _mesa_glsl_error(&loc
, state
,
5517 "gl_PerVertex output may not be redeclared with "
5518 "an instance name");
5522 _mesa_glsl_error(&loc
, state
,
5523 "gl_PerVertex must be declared as an input or an "
5528 if (earlier_per_vertex
== NULL
) {
5529 /* An error has already been reported. Bail out to avoid null
5530 * dereferences later in this function.
5535 /* Copy locations from the old gl_PerVertex interface block. */
5536 for (unsigned i
= 0; i
< num_variables
; i
++) {
5537 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
5539 _mesa_glsl_error(&loc
, state
,
5540 "redeclaration of gl_PerVertex must be a subset "
5541 "of the built-in members of gl_PerVertex");
5543 fields
[i
].location
=
5544 earlier_per_vertex
->fields
.structure
[j
].location
;
5545 fields
[i
].interpolation
=
5546 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
5547 fields
[i
].centroid
=
5548 earlier_per_vertex
->fields
.structure
[j
].centroid
;
5550 earlier_per_vertex
->fields
.structure
[j
].sample
;
5554 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
5557 * If a built-in interface block is redeclared, it must appear in
5558 * the shader before any use of any member included in the built-in
5559 * declaration, or a compilation error will result.
5561 * This appears to be a clarification to the behaviour established for
5562 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
5563 * regardless of GLSL version.
5565 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
5566 v
.run(instructions
);
5567 if (v
.usage_found()) {
5568 _mesa_glsl_error(&loc
, state
,
5569 "redeclaration of a built-in interface block must "
5570 "appear before any use of any member of the "
5575 const glsl_type
*block_type
=
5576 glsl_type::get_interface_instance(fields
,
5581 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
5582 YYLTYPE loc
= this->get_location();
5583 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
5584 "already taken in the current scope",
5585 this->block_name
, iface_type_name
);
5588 /* Since interface blocks cannot contain statements, it should be
5589 * impossible for the block to generate any instructions.
5591 assert(declared_variables
.is_empty());
5593 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5595 * Geometry shader input variables get the per-vertex values written
5596 * out by vertex shader output variables of the same names. Since a
5597 * geometry shader operates on a set of vertices, each input varying
5598 * variable (or input block, see interface blocks below) needs to be
5599 * declared as an array.
5601 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
5602 var_mode
== ir_var_shader_in
) {
5603 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
5606 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
5609 * "If an instance name (instance-name) is used, then it puts all the
5610 * members inside a scope within its own name space, accessed with the
5611 * field selector ( . ) operator (analogously to structures)."
5613 if (this->instance_name
) {
5614 if (redeclaring_per_vertex
) {
5615 /* When a built-in in an unnamed interface block is redeclared,
5616 * get_variable_being_redeclared() calls
5617 * check_builtin_array_max_size() to make sure that built-in array
5618 * variables aren't redeclared to illegal sizes. But we're looking
5619 * at a redeclaration of a named built-in interface block. So we
5620 * have to manually call check_builtin_array_max_size() for all parts
5621 * of the interface that are arrays.
5623 for (unsigned i
= 0; i
< num_variables
; i
++) {
5624 if (fields
[i
].type
->is_array()) {
5625 const unsigned size
= fields
[i
].type
->array_size();
5626 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
5630 validate_identifier(this->instance_name
, loc
, state
);
5635 if (this->array_specifier
!= NULL
) {
5636 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
5638 * For uniform blocks declared an array, each individual array
5639 * element corresponds to a separate buffer object backing one
5640 * instance of the block. As the array size indicates the number
5641 * of buffer objects needed, uniform block array declarations
5642 * must specify an array size.
5644 * And a few paragraphs later:
5646 * Geometry shader input blocks must be declared as arrays and
5647 * follow the array declaration and linking rules for all
5648 * geometry shader inputs. All other input and output block
5649 * arrays must specify an array size.
5651 * The upshot of this is that the only circumstance where an
5652 * interface array size *doesn't* need to be specified is on a
5653 * geometry shader input.
5655 if (this->array_specifier
->is_unsized_array
&&
5656 (state
->stage
!= MESA_SHADER_GEOMETRY
|| !this->layout
.flags
.q
.in
)) {
5657 _mesa_glsl_error(&loc
, state
,
5658 "only geometry shader inputs may be unsized "
5659 "instance block arrays");
5663 const glsl_type
*block_array_type
=
5664 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
5666 var
= new(state
) ir_variable(block_array_type
,
5667 this->instance_name
,
5670 var
= new(state
) ir_variable(block_type
,
5671 this->instance_name
,
5675 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
5676 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
5678 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
5679 handle_geometry_shader_input_decl(state
, loc
, var
);
5681 if (ir_variable
*earlier
=
5682 state
->symbols
->get_variable(this->instance_name
)) {
5683 if (!redeclaring_per_vertex
) {
5684 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
5685 this->instance_name
);
5687 earlier
->data
.how_declared
= ir_var_declared_normally
;
5688 earlier
->type
= var
->type
;
5689 earlier
->reinit_interface_type(block_type
);
5692 /* Propagate the "binding" keyword into this UBO's fields;
5693 * the UBO declaration itself doesn't get an ir_variable unless it
5694 * has an instance name. This is ugly.
5696 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5697 var
->data
.binding
= this->layout
.binding
;
5699 state
->symbols
->add_variable(var
);
5700 instructions
->push_tail(var
);
5703 /* In order to have an array size, the block must also be declared with
5706 assert(this->array_specifier
== NULL
);
5708 for (unsigned i
= 0; i
< num_variables
; i
++) {
5710 new(state
) ir_variable(fields
[i
].type
,
5711 ralloc_strdup(state
, fields
[i
].name
),
5713 var
->data
.interpolation
= fields
[i
].interpolation
;
5714 var
->data
.centroid
= fields
[i
].centroid
;
5715 var
->data
.sample
= fields
[i
].sample
;
5716 var
->init_interface_type(block_type
);
5718 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
5719 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
5720 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
5722 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
5725 if (fields
[i
].stream
!= -1 &&
5726 ((unsigned)fields
[i
].stream
) != this->layout
.stream
) {
5727 _mesa_glsl_error(&loc
, state
,
5728 "stream layout qualifier on "
5729 "interface block member `%s' does not match "
5730 "the interface block (%d vs %d)",
5731 var
->name
, fields
[i
].stream
, this->layout
.stream
);
5734 var
->data
.stream
= this->layout
.stream
;
5736 /* Examine var name here since var may get deleted in the next call */
5737 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5739 if (redeclaring_per_vertex
) {
5740 ir_variable
*earlier
=
5741 get_variable_being_redeclared(var
, loc
, state
,
5742 true /* allow_all_redeclarations */);
5743 if (!var_is_gl_id
|| earlier
== NULL
) {
5744 _mesa_glsl_error(&loc
, state
,
5745 "redeclaration of gl_PerVertex can only "
5746 "include built-in variables");
5747 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
5748 _mesa_glsl_error(&loc
, state
,
5749 "`%s' has already been redeclared",
5752 earlier
->data
.how_declared
= ir_var_declared_in_block
;
5753 earlier
->reinit_interface_type(block_type
);
5758 if (state
->symbols
->get_variable(var
->name
) != NULL
)
5759 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
5761 /* Propagate the "binding" keyword into this UBO's fields;
5762 * the UBO declaration itself doesn't get an ir_variable unless it
5763 * has an instance name. This is ugly.
5765 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5766 var
->data
.binding
= this->layout
.binding
;
5768 state
->symbols
->add_variable(var
);
5769 instructions
->push_tail(var
);
5772 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
5773 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
5775 * It is also a compilation error ... to redeclare a built-in
5776 * block and then use a member from that built-in block that was
5777 * not included in the redeclaration.
5779 * This appears to be a clarification to the behaviour established
5780 * for gl_PerVertex by GLSL 1.50, therefore we implement this
5781 * behaviour regardless of GLSL version.
5783 * To prevent the shader from using a member that was not included in
5784 * the redeclaration, we disable any ir_variables that are still
5785 * associated with the old declaration of gl_PerVertex (since we've
5786 * already updated all of the variables contained in the new
5787 * gl_PerVertex to point to it).
5789 * As a side effect this will prevent
5790 * validate_intrastage_interface_blocks() from getting confused and
5791 * thinking there are conflicting definitions of gl_PerVertex in the
5794 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
5795 ir_variable
*const var
= node
->as_variable();
5797 var
->get_interface_type() == earlier_per_vertex
&&
5798 var
->data
.mode
== var_mode
) {
5799 if (var
->data
.how_declared
== ir_var_declared_normally
) {
5800 _mesa_glsl_error(&loc
, state
,
5801 "redeclaration of gl_PerVertex cannot "
5802 "follow a redeclaration of `%s'",
5805 state
->symbols
->disable_variable(var
->name
);
5817 ast_gs_input_layout::hir(exec_list
*instructions
,
5818 struct _mesa_glsl_parse_state
*state
)
5820 YYLTYPE loc
= this->get_location();
5822 /* If any geometry input layout declaration preceded this one, make sure it
5823 * was consistent with this one.
5825 if (state
->gs_input_prim_type_specified
&&
5826 state
->in_qualifier
->prim_type
!= this->prim_type
) {
5827 _mesa_glsl_error(&loc
, state
,
5828 "geometry shader input layout does not match"
5829 " previous declaration");
5833 /* If any shader inputs occurred before this declaration and specified an
5834 * array size, make sure the size they specified is consistent with the
5837 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
5838 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
5839 _mesa_glsl_error(&loc
, state
,
5840 "this geometry shader input layout implies %u vertices"
5841 " per primitive, but a previous input is declared"
5842 " with size %u", num_vertices
, state
->gs_input_size
);
5846 state
->gs_input_prim_type_specified
= true;
5848 /* If any shader inputs occurred before this declaration and did not
5849 * specify an array size, their size is determined now.
5851 foreach_in_list(ir_instruction
, node
, instructions
) {
5852 ir_variable
*var
= node
->as_variable();
5853 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
5856 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
5860 if (var
->type
->is_unsized_array()) {
5861 if (var
->data
.max_array_access
>= num_vertices
) {
5862 _mesa_glsl_error(&loc
, state
,
5863 "this geometry shader input layout implies %u"
5864 " vertices, but an access to element %u of input"
5865 " `%s' already exists", num_vertices
,
5866 var
->data
.max_array_access
, var
->name
);
5868 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
5879 ast_cs_input_layout::hir(exec_list
*instructions
,
5880 struct _mesa_glsl_parse_state
*state
)
5882 YYLTYPE loc
= this->get_location();
5884 /* If any compute input layout declaration preceded this one, make sure it
5885 * was consistent with this one.
5887 if (state
->cs_input_local_size_specified
) {
5888 for (int i
= 0; i
< 3; i
++) {
5889 if (state
->cs_input_local_size
[i
] != this->local_size
[i
]) {
5890 _mesa_glsl_error(&loc
, state
,
5891 "compute shader input layout does not match"
5892 " previous declaration");
5898 /* From the ARB_compute_shader specification:
5900 * If the local size of the shader in any dimension is greater
5901 * than the maximum size supported by the implementation for that
5902 * dimension, a compile-time error results.
5904 * It is not clear from the spec how the error should be reported if
5905 * the total size of the work group exceeds
5906 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
5907 * report it at compile time as well.
5909 GLuint64 total_invocations
= 1;
5910 for (int i
= 0; i
< 3; i
++) {
5911 if (this->local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
5912 _mesa_glsl_error(&loc
, state
,
5913 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
5915 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
5918 total_invocations
*= this->local_size
[i
];
5919 if (total_invocations
>
5920 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
5921 _mesa_glsl_error(&loc
, state
,
5922 "product of local_sizes exceeds "
5923 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
5924 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
5929 state
->cs_input_local_size_specified
= true;
5930 for (int i
= 0; i
< 3; i
++)
5931 state
->cs_input_local_size
[i
] = this->local_size
[i
];
5933 /* We may now declare the built-in constant gl_WorkGroupSize (see
5934 * builtin_variable_generator::generate_constants() for why we didn't
5935 * declare it earlier).
5937 ir_variable
*var
= new(state
->symbols
)
5938 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
5939 var
->data
.how_declared
= ir_var_declared_implicitly
;
5940 var
->data
.read_only
= true;
5941 instructions
->push_tail(var
);
5942 state
->symbols
->add_variable(var
);
5943 ir_constant_data data
;
5944 memset(&data
, 0, sizeof(data
));
5945 for (int i
= 0; i
< 3; i
++)
5946 data
.u
[i
] = this->local_size
[i
];
5947 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
5948 var
->constant_initializer
=
5949 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
5950 var
->data
.has_initializer
= true;
5957 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
5958 exec_list
*instructions
)
5960 bool gl_FragColor_assigned
= false;
5961 bool gl_FragData_assigned
= false;
5962 bool user_defined_fs_output_assigned
= false;
5963 ir_variable
*user_defined_fs_output
= NULL
;
5965 /* It would be nice to have proper location information. */
5967 memset(&loc
, 0, sizeof(loc
));
5969 foreach_in_list(ir_instruction
, node
, instructions
) {
5970 ir_variable
*var
= node
->as_variable();
5972 if (!var
|| !var
->data
.assigned
)
5975 if (strcmp(var
->name
, "gl_FragColor") == 0)
5976 gl_FragColor_assigned
= true;
5977 else if (strcmp(var
->name
, "gl_FragData") == 0)
5978 gl_FragData_assigned
= true;
5979 else if (!is_gl_identifier(var
->name
)) {
5980 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
5981 var
->data
.mode
== ir_var_shader_out
) {
5982 user_defined_fs_output_assigned
= true;
5983 user_defined_fs_output
= var
;
5988 /* From the GLSL 1.30 spec:
5990 * "If a shader statically assigns a value to gl_FragColor, it
5991 * may not assign a value to any element of gl_FragData. If a
5992 * shader statically writes a value to any element of
5993 * gl_FragData, it may not assign a value to
5994 * gl_FragColor. That is, a shader may assign values to either
5995 * gl_FragColor or gl_FragData, but not both. Multiple shaders
5996 * linked together must also consistently write just one of
5997 * these variables. Similarly, if user declared output
5998 * variables are in use (statically assigned to), then the
5999 * built-in variables gl_FragColor and gl_FragData may not be
6000 * assigned to. These incorrect usages all generate compile
6003 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
6004 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6005 "`gl_FragColor' and `gl_FragData'");
6006 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
6007 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6008 "`gl_FragColor' and `%s'",
6009 user_defined_fs_output
->name
);
6010 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
6011 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6012 "`gl_FragData' and `%s'",
6013 user_defined_fs_output
->name
);
6019 remove_per_vertex_blocks(exec_list
*instructions
,
6020 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
6022 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
6023 * if it exists in this shader type.
6025 const glsl_type
*per_vertex
= NULL
;
6027 case ir_var_shader_in
:
6028 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
6029 per_vertex
= gl_in
->get_interface_type();
6031 case ir_var_shader_out
:
6032 if (ir_variable
*gl_Position
=
6033 state
->symbols
->get_variable("gl_Position")) {
6034 per_vertex
= gl_Position
->get_interface_type();
6038 assert(!"Unexpected mode");
6042 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
6043 * need to do anything.
6045 if (per_vertex
== NULL
)
6048 /* If the interface block is used by the shader, then we don't need to do
6051 interface_block_usage_visitor
v(mode
, per_vertex
);
6052 v
.run(instructions
);
6053 if (v
.usage_found())
6056 /* Remove any ir_variable declarations that refer to the interface block
6059 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
6060 ir_variable
*const var
= node
->as_variable();
6061 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
6062 var
->data
.mode
== mode
) {
6063 state
->symbols
->disable_variable(var
->name
);