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 "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
57 #include "program/hash_table.h"
61 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
62 exec_list
*instructions
);
65 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
67 _mesa_glsl_initialize_variables(instructions
, state
);
69 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
71 state
->current_function
= NULL
;
73 state
->toplevel_ir
= instructions
;
75 /* Section 4.2 of the GLSL 1.20 specification states:
76 * "The built-in functions are scoped in a scope outside the global scope
77 * users declare global variables in. That is, a shader's global scope,
78 * available for user-defined functions and global variables, is nested
79 * inside the scope containing the built-in functions."
81 * Since built-in functions like ftransform() access built-in variables,
82 * it follows that those must be in the outer scope as well.
84 * We push scope here to create this nesting effect...but don't pop.
85 * This way, a shader's globals are still in the symbol table for use
88 state
->symbols
->push_scope();
90 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
91 ast
->hir(instructions
, state
);
93 detect_recursion_unlinked(state
, instructions
);
94 detect_conflicting_assignments(state
, instructions
);
96 state
->toplevel_ir
= NULL
;
98 /* Move all of the variable declarations to the front of the IR list, and
99 * reverse the order. This has the (intended!) side effect that vertex
100 * shader inputs and fragment shader outputs will appear in the IR in the
101 * same order that they appeared in the shader code. This results in the
102 * locations being assigned in the declared order. Many (arguably buggy)
103 * applications depend on this behavior, and it matches what nearly all
106 foreach_list_safe(node
, instructions
) {
107 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
113 instructions
->push_head(var
);
119 * If a conversion is available, convert one operand to a different type
121 * The \c from \c ir_rvalue is converted "in place".
123 * \param to Type that the operand it to be converted to
124 * \param from Operand that is being converted
125 * \param state GLSL compiler state
128 * If a conversion is possible (or unnecessary), \c true is returned.
129 * Otherwise \c false is returned.
132 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
133 struct _mesa_glsl_parse_state
*state
)
136 if (to
->base_type
== from
->type
->base_type
)
139 /* This conversion was added in GLSL 1.20. If the compilation mode is
140 * GLSL 1.10, the conversion is skipped.
142 if (!state
->is_version(120, 0))
145 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
147 * "There are no implicit array or structure conversions. For
148 * example, an array of int cannot be implicitly converted to an
149 * array of float. There are no implicit conversions between
150 * signed and unsigned integers."
152 /* FINISHME: The above comment is partially a lie. There is int/uint
153 * FINISHME: conversion for immediate constants.
155 if (!to
->is_float() || !from
->type
->is_numeric())
158 /* Convert to a floating point type with the same number of components
159 * as the original type - i.e. int to float, not int to vec4.
161 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
162 from
->type
->matrix_columns
);
164 switch (from
->type
->base_type
) {
166 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
169 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
172 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
182 static const struct glsl_type
*
183 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
185 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
187 const glsl_type
*type_a
= value_a
->type
;
188 const glsl_type
*type_b
= value_b
->type
;
190 /* From GLSL 1.50 spec, page 56:
192 * "The arithmetic binary operators add (+), subtract (-),
193 * multiply (*), and divide (/) operate on integer and
194 * floating-point scalars, vectors, and matrices."
196 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
197 _mesa_glsl_error(loc
, state
,
198 "operands to arithmetic operators must be numeric");
199 return glsl_type::error_type
;
203 /* "If one operand is floating-point based and the other is
204 * not, then the conversions from Section 4.1.10 "Implicit
205 * Conversions" are applied to the non-floating-point-based operand."
207 if (!apply_implicit_conversion(type_a
, value_b
, state
)
208 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
209 _mesa_glsl_error(loc
, state
,
210 "could not implicitly convert operands to "
211 "arithmetic operator");
212 return glsl_type::error_type
;
214 type_a
= value_a
->type
;
215 type_b
= value_b
->type
;
217 /* "If the operands are integer types, they must both be signed or
220 * From this rule and the preceeding conversion it can be inferred that
221 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
222 * The is_numeric check above already filtered out the case where either
223 * type is not one of these, so now the base types need only be tested for
226 if (type_a
->base_type
!= type_b
->base_type
) {
227 _mesa_glsl_error(loc
, state
,
228 "base type mismatch for arithmetic operator");
229 return glsl_type::error_type
;
232 /* "All arithmetic binary operators result in the same fundamental type
233 * (signed integer, unsigned integer, or floating-point) as the
234 * operands they operate on, after operand type conversion. After
235 * conversion, the following cases are valid
237 * * The two operands are scalars. In this case the operation is
238 * applied, resulting in a scalar."
240 if (type_a
->is_scalar() && type_b
->is_scalar())
243 /* "* One operand is a scalar, and the other is a vector or matrix.
244 * In this case, the scalar operation is applied independently to each
245 * component of the vector or matrix, resulting in the same size
248 if (type_a
->is_scalar()) {
249 if (!type_b
->is_scalar())
251 } else if (type_b
->is_scalar()) {
255 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
256 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
259 assert(!type_a
->is_scalar());
260 assert(!type_b
->is_scalar());
262 /* "* The two operands are vectors of the same size. In this case, the
263 * operation is done component-wise resulting in the same size
266 if (type_a
->is_vector() && type_b
->is_vector()) {
267 if (type_a
== type_b
) {
270 _mesa_glsl_error(loc
, state
,
271 "vector size mismatch for arithmetic operator");
272 return glsl_type::error_type
;
276 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
277 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
278 * <vector, vector> have been handled. At least one of the operands must
279 * be matrix. Further, since there are no integer matrix types, the base
280 * type of both operands must be float.
282 assert(type_a
->is_matrix() || type_b
->is_matrix());
283 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
284 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
286 /* "* The operator is add (+), subtract (-), or divide (/), and the
287 * operands are matrices with the same number of rows and the same
288 * number of columns. In this case, the operation is done component-
289 * wise resulting in the same size matrix."
290 * * The operator is multiply (*), where both operands are matrices or
291 * one operand is a vector and the other a matrix. A right vector
292 * operand is treated as a column vector and a left vector operand as a
293 * row vector. In all these cases, it is required that the number of
294 * columns of the left operand is equal to the number of rows of the
295 * right operand. Then, the multiply (*) operation does a linear
296 * algebraic multiply, yielding an object that has the same number of
297 * rows as the left operand and the same number of columns as the right
298 * operand. Section 5.10 "Vector and Matrix Operations" explains in
299 * more detail how vectors and matrices are operated on."
302 if (type_a
== type_b
)
305 if (type_a
->is_matrix() && type_b
->is_matrix()) {
306 /* Matrix multiply. The columns of A must match the rows of B. Given
307 * the other previously tested constraints, this means the vector type
308 * of a row from A must be the same as the vector type of a column from
311 if (type_a
->row_type() == type_b
->column_type()) {
312 /* The resulting matrix has the number of columns of matrix B and
313 * the number of rows of matrix A. We get the row count of A by
314 * looking at the size of a vector that makes up a column. The
315 * transpose (size of a row) is done for B.
317 const glsl_type
*const type
=
318 glsl_type::get_instance(type_a
->base_type
,
319 type_a
->column_type()->vector_elements
,
320 type_b
->row_type()->vector_elements
);
321 assert(type
!= glsl_type::error_type
);
325 } else if (type_a
->is_matrix()) {
326 /* A is a matrix and B is a column vector. Columns of A must match
327 * rows of B. Given the other previously tested constraints, this
328 * means the vector type of a row from A must be the same as the
329 * vector the type of B.
331 if (type_a
->row_type() == type_b
) {
332 /* The resulting vector has a number of elements equal to
333 * the number of rows of matrix A. */
334 const glsl_type
*const type
=
335 glsl_type::get_instance(type_a
->base_type
,
336 type_a
->column_type()->vector_elements
,
338 assert(type
!= glsl_type::error_type
);
343 assert(type_b
->is_matrix());
345 /* A is a row vector and B is a matrix. Columns of A must match rows
346 * of B. Given the other previously tested constraints, this means
347 * the type of A must be the same as the vector type of a column from
350 if (type_a
== type_b
->column_type()) {
351 /* The resulting vector has a number of elements equal to
352 * the number of columns of matrix B. */
353 const glsl_type
*const type
=
354 glsl_type::get_instance(type_a
->base_type
,
355 type_b
->row_type()->vector_elements
,
357 assert(type
!= glsl_type::error_type
);
363 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
364 return glsl_type::error_type
;
368 /* "All other cases are illegal."
370 _mesa_glsl_error(loc
, state
, "type mismatch");
371 return glsl_type::error_type
;
375 static const struct glsl_type
*
376 unary_arithmetic_result_type(const struct glsl_type
*type
,
377 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
379 /* From GLSL 1.50 spec, page 57:
381 * "The arithmetic unary operators negate (-), post- and pre-increment
382 * and decrement (-- and ++) operate on integer or floating-point
383 * values (including vectors and matrices). All unary operators work
384 * component-wise on their operands. These result with the same type
387 if (!type
->is_numeric()) {
388 _mesa_glsl_error(loc
, state
,
389 "operands to arithmetic operators must be numeric");
390 return glsl_type::error_type
;
397 * \brief Return the result type of a bit-logic operation.
399 * If the given types to the bit-logic operator are invalid, return
400 * glsl_type::error_type.
402 * \param type_a Type of LHS of bit-logic op
403 * \param type_b Type of RHS of bit-logic op
405 static const struct glsl_type
*
406 bit_logic_result_type(const struct glsl_type
*type_a
,
407 const struct glsl_type
*type_b
,
409 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
411 if (!state
->check_bitwise_operations_allowed(loc
)) {
412 return glsl_type::error_type
;
415 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
417 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
418 * (|). The operands must be of type signed or unsigned integers or
421 if (!type_a
->is_integer()) {
422 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
423 ast_expression::operator_string(op
));
424 return glsl_type::error_type
;
426 if (!type_b
->is_integer()) {
427 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
428 ast_expression::operator_string(op
));
429 return glsl_type::error_type
;
432 /* "The fundamental types of the operands (signed or unsigned) must
435 if (type_a
->base_type
!= type_b
->base_type
) {
436 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
437 "base type", ast_expression::operator_string(op
));
438 return glsl_type::error_type
;
441 /* "The operands cannot be vectors of differing size." */
442 if (type_a
->is_vector() &&
443 type_b
->is_vector() &&
444 type_a
->vector_elements
!= type_b
->vector_elements
) {
445 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
446 "different sizes", ast_expression::operator_string(op
));
447 return glsl_type::error_type
;
450 /* "If one operand is a scalar and the other a vector, the scalar is
451 * applied component-wise to the vector, resulting in the same type as
452 * the vector. The fundamental types of the operands [...] will be the
453 * resulting fundamental type."
455 if (type_a
->is_scalar())
461 static const struct glsl_type
*
462 modulus_result_type(const struct glsl_type
*type_a
,
463 const struct glsl_type
*type_b
,
464 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
466 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
467 return glsl_type::error_type
;
470 /* From GLSL 1.50 spec, page 56:
471 * "The operator modulus (%) operates on signed or unsigned integers or
472 * integer vectors. The operand types must both be signed or both be
475 if (!type_a
->is_integer()) {
476 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
477 return glsl_type::error_type
;
479 if (!type_b
->is_integer()) {
480 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
481 return glsl_type::error_type
;
483 if (type_a
->base_type
!= type_b
->base_type
) {
484 _mesa_glsl_error(loc
, state
,
485 "operands of %% must have the same base type");
486 return glsl_type::error_type
;
489 /* "The operands cannot be vectors of differing size. If one operand is
490 * a scalar and the other vector, then the scalar is applied component-
491 * wise to the vector, resulting in the same type as the vector. If both
492 * are vectors of the same size, the result is computed component-wise."
494 if (type_a
->is_vector()) {
495 if (!type_b
->is_vector()
496 || (type_a
->vector_elements
== type_b
->vector_elements
))
501 /* "The operator modulus (%) is not defined for any other data types
502 * (non-integer types)."
504 _mesa_glsl_error(loc
, state
, "type mismatch");
505 return glsl_type::error_type
;
509 static const struct glsl_type
*
510 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
511 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
513 const glsl_type
*type_a
= value_a
->type
;
514 const glsl_type
*type_b
= value_b
->type
;
516 /* From GLSL 1.50 spec, page 56:
517 * "The relational operators greater than (>), less than (<), greater
518 * than or equal (>=), and less than or equal (<=) operate only on
519 * scalar integer and scalar floating-point expressions."
521 if (!type_a
->is_numeric()
522 || !type_b
->is_numeric()
523 || !type_a
->is_scalar()
524 || !type_b
->is_scalar()) {
525 _mesa_glsl_error(loc
, state
,
526 "operands to relational operators must be scalar and "
528 return glsl_type::error_type
;
531 /* "Either the operands' types must match, or the conversions from
532 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
533 * operand, after which the types must match."
535 if (!apply_implicit_conversion(type_a
, value_b
, state
)
536 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
537 _mesa_glsl_error(loc
, state
,
538 "could not implicitly convert operands to "
539 "relational operator");
540 return glsl_type::error_type
;
542 type_a
= value_a
->type
;
543 type_b
= value_b
->type
;
545 if (type_a
->base_type
!= type_b
->base_type
) {
546 _mesa_glsl_error(loc
, state
, "base type mismatch");
547 return glsl_type::error_type
;
550 /* "The result is scalar Boolean."
552 return glsl_type::bool_type
;
556 * \brief Return the result type of a bit-shift operation.
558 * If the given types to the bit-shift operator are invalid, return
559 * glsl_type::error_type.
561 * \param type_a Type of LHS of bit-shift op
562 * \param type_b Type of RHS of bit-shift op
564 static const struct glsl_type
*
565 shift_result_type(const struct glsl_type
*type_a
,
566 const struct glsl_type
*type_b
,
568 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
570 if (!state
->check_bitwise_operations_allowed(loc
)) {
571 return glsl_type::error_type
;
574 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
576 * "The shift operators (<<) and (>>). For both operators, the operands
577 * must be signed or unsigned integers or integer vectors. One operand
578 * can be signed while the other is unsigned."
580 if (!type_a
->is_integer()) {
581 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
582 "integer vector", ast_expression::operator_string(op
));
583 return glsl_type::error_type
;
586 if (!type_b
->is_integer()) {
587 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
588 "integer vector", ast_expression::operator_string(op
));
589 return glsl_type::error_type
;
592 /* "If the first operand is a scalar, the second operand has to be
595 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
596 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
597 "second must be scalar as well",
598 ast_expression::operator_string(op
));
599 return glsl_type::error_type
;
602 /* If both operands are vectors, check that they have same number of
605 if (type_a
->is_vector() &&
606 type_b
->is_vector() &&
607 type_a
->vector_elements
!= type_b
->vector_elements
) {
608 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
609 "have same number of elements",
610 ast_expression::operator_string(op
));
611 return glsl_type::error_type
;
614 /* "In all cases, the resulting type will be the same type as the left
621 * Validates that a value can be assigned to a location with a specified type
623 * Validates that \c rhs can be assigned to some location. If the types are
624 * not an exact match but an automatic conversion is possible, \c rhs will be
628 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
629 * Otherwise the actual RHS to be assigned will be returned. This may be
630 * \c rhs, or it may be \c rhs after some type conversion.
633 * In addition to being used for assignments, this function is used to
634 * type-check return values.
637 validate_assignment(struct _mesa_glsl_parse_state
*state
,
638 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
641 /* If there is already some error in the RHS, just return it. Anything
642 * else will lead to an avalanche of error message back to the user.
644 if (rhs
->type
->is_error())
647 /* If the types are identical, the assignment can trivially proceed.
649 if (rhs
->type
== lhs_type
)
652 /* If the array element types are the same and the size of the LHS is zero,
653 * the assignment is okay for initializers embedded in variable
656 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
657 * is handled by ir_dereference::is_lvalue.
659 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
660 && (lhs_type
->element_type() == rhs
->type
->element_type())
661 && (lhs_type
->array_size() == 0)) {
665 /* Check for implicit conversion in GLSL 1.20 */
666 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
667 if (rhs
->type
== lhs_type
)
675 mark_whole_array_access(ir_rvalue
*access
)
677 ir_dereference_variable
*deref
= access
->as_dereference_variable();
679 if (deref
&& deref
->var
) {
680 deref
->var
->max_array_access
= deref
->type
->length
- 1;
685 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
686 const char *non_lvalue_description
,
687 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
691 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
693 /* If the assignment LHS comes back as an ir_binop_vector_extract
694 * expression, move it to the RHS as an ir_triop_vector_insert.
696 if (lhs
->ir_type
== ir_type_expression
) {
697 ir_expression
*const expr
= lhs
->as_expression();
699 if (unlikely(expr
->operation
== ir_binop_vector_extract
)) {
701 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
703 if (new_rhs
== NULL
) {
704 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
707 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
708 expr
->operands
[0]->type
,
712 lhs
= expr
->operands
[0]->clone(ctx
, NULL
);
717 ir_variable
*lhs_var
= lhs
->variable_referenced();
719 lhs_var
->assigned
= true;
721 if (!error_emitted
) {
722 if (non_lvalue_description
!= NULL
) {
723 _mesa_glsl_error(&lhs_loc
, state
,
725 non_lvalue_description
);
726 error_emitted
= true;
727 } else if (lhs
->variable_referenced() != NULL
728 && lhs
->variable_referenced()->read_only
) {
729 _mesa_glsl_error(&lhs_loc
, state
,
730 "assignment to read-only variable '%s'",
731 lhs
->variable_referenced()->name
);
732 error_emitted
= true;
734 } else if (lhs
->type
->is_array() &&
735 !state
->check_version(120, 300, &lhs_loc
,
736 "whole array assignment forbidden")) {
737 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
739 * "Other binary or unary expressions, non-dereferenced
740 * arrays, function names, swizzles with repeated fields,
741 * and constants cannot be l-values."
743 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
745 error_emitted
= true;
746 } else if (!lhs
->is_lvalue()) {
747 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
748 error_emitted
= true;
753 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
754 if (new_rhs
== NULL
) {
755 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
759 /* If the LHS array was not declared with a size, it takes it size from
760 * the RHS. If the LHS is an l-value and a whole array, it must be a
761 * dereference of a variable. Any other case would require that the LHS
762 * is either not an l-value or not a whole array.
764 if (lhs
->type
->array_size() == 0) {
765 ir_dereference
*const d
= lhs
->as_dereference();
769 ir_variable
*const var
= d
->variable_referenced();
773 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
774 /* FINISHME: This should actually log the location of the RHS. */
775 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
777 var
->max_array_access
);
780 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
781 rhs
->type
->array_size());
784 mark_whole_array_access(rhs
);
785 mark_whole_array_access(lhs
);
788 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
789 * but not post_inc) need the converted assigned value as an rvalue
790 * to handle things like:
794 * So we always just store the computed value being assigned to a
795 * temporary and return a deref of that temporary. If the rvalue
796 * ends up not being used, the temp will get copy-propagated out.
798 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
800 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
801 instructions
->push_tail(var
);
802 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
803 deref_var
= new(ctx
) ir_dereference_variable(var
);
806 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
808 return new(ctx
) ir_dereference_variable(var
);
812 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
814 void *ctx
= ralloc_parent(lvalue
);
817 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
819 instructions
->push_tail(var
);
820 var
->mode
= ir_var_auto
;
822 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
825 return new(ctx
) ir_dereference_variable(var
);
830 ast_node::hir(exec_list
*instructions
,
831 struct _mesa_glsl_parse_state
*state
)
840 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
843 ir_rvalue
*cmp
= NULL
;
845 if (operation
== ir_binop_all_equal
)
846 join_op
= ir_binop_logic_and
;
848 join_op
= ir_binop_logic_or
;
850 switch (op0
->type
->base_type
) {
851 case GLSL_TYPE_FLOAT
:
855 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
857 case GLSL_TYPE_ARRAY
: {
858 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
859 ir_rvalue
*e0
, *e1
, *result
;
861 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
862 new(mem_ctx
) ir_constant(i
));
863 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
864 new(mem_ctx
) ir_constant(i
));
865 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
868 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
874 mark_whole_array_access(op0
);
875 mark_whole_array_access(op1
);
879 case GLSL_TYPE_STRUCT
: {
880 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
881 ir_rvalue
*e0
, *e1
, *result
;
882 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
884 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
886 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
888 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
891 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
899 case GLSL_TYPE_ERROR
:
901 case GLSL_TYPE_SAMPLER
:
902 case GLSL_TYPE_INTERFACE
:
903 /* I assume a comparison of a struct containing a sampler just
904 * ignores the sampler present in the type.
910 cmp
= new(mem_ctx
) ir_constant(true);
915 /* For logical operations, we want to ensure that the operands are
916 * scalar booleans. If it isn't, emit an error and return a constant
917 * boolean to avoid triggering cascading error messages.
920 get_scalar_boolean_operand(exec_list
*instructions
,
921 struct _mesa_glsl_parse_state
*state
,
922 ast_expression
*parent_expr
,
924 const char *operand_name
,
927 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
929 ir_rvalue
*val
= expr
->hir(instructions
, state
);
931 if (val
->type
->is_boolean() && val
->type
->is_scalar())
934 if (!*error_emitted
) {
935 YYLTYPE loc
= expr
->get_location();
936 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
938 parent_expr
->operator_string(parent_expr
->oper
));
939 *error_emitted
= true;
942 return new(ctx
) ir_constant(true);
946 * If name refers to a builtin array whose maximum allowed size is less than
947 * size, report an error and return true. Otherwise return false.
950 check_builtin_array_max_size(const char *name
, unsigned size
,
951 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
953 if ((strcmp("gl_TexCoord", name
) == 0)
954 && (size
> state
->Const
.MaxTextureCoords
)) {
955 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
957 * "The size [of gl_TexCoord] can be at most
958 * gl_MaxTextureCoords."
960 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
961 "be larger than gl_MaxTextureCoords (%u)",
962 state
->Const
.MaxTextureCoords
);
963 } else if (strcmp("gl_ClipDistance", name
) == 0
964 && size
> state
->Const
.MaxClipPlanes
) {
965 /* From section 7.1 (Vertex Shader Special Variables) of the
968 * "The gl_ClipDistance array is predeclared as unsized and
969 * must be sized by the shader either redeclaring it with a
970 * size or indexing it only with integral constant
971 * expressions. ... The size can be at most
972 * gl_MaxClipDistances."
974 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
975 "be larger than gl_MaxClipDistances (%u)",
976 state
->Const
.MaxClipPlanes
);
981 * Create the constant 1, of a which is appropriate for incrementing and
982 * decrementing values of the given GLSL type. For example, if type is vec4,
983 * this creates a constant value of 1.0 having type float.
985 * If the given type is invalid for increment and decrement operators, return
986 * a floating point 1--the error will be detected later.
989 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
991 switch (type
->base_type
) {
993 return new(ctx
) ir_constant((unsigned) 1);
995 return new(ctx
) ir_constant(1);
997 case GLSL_TYPE_FLOAT
:
998 return new(ctx
) ir_constant(1.0f
);
1003 ast_expression::hir(exec_list
*instructions
,
1004 struct _mesa_glsl_parse_state
*state
)
1007 static const int operations
[AST_NUM_OPERATORS
] = {
1008 -1, /* ast_assign doesn't convert to ir_expression. */
1009 -1, /* ast_plus doesn't convert to ir_expression. */
1023 ir_binop_any_nequal
,
1033 /* Note: The following block of expression types actually convert
1034 * to multiple IR instructions.
1036 ir_binop_mul
, /* ast_mul_assign */
1037 ir_binop_div
, /* ast_div_assign */
1038 ir_binop_mod
, /* ast_mod_assign */
1039 ir_binop_add
, /* ast_add_assign */
1040 ir_binop_sub
, /* ast_sub_assign */
1041 ir_binop_lshift
, /* ast_ls_assign */
1042 ir_binop_rshift
, /* ast_rs_assign */
1043 ir_binop_bit_and
, /* ast_and_assign */
1044 ir_binop_bit_xor
, /* ast_xor_assign */
1045 ir_binop_bit_or
, /* ast_or_assign */
1047 -1, /* ast_conditional doesn't convert to ir_expression. */
1048 ir_binop_add
, /* ast_pre_inc. */
1049 ir_binop_sub
, /* ast_pre_dec. */
1050 ir_binop_add
, /* ast_post_inc. */
1051 ir_binop_sub
, /* ast_post_dec. */
1052 -1, /* ast_field_selection doesn't conv to ir_expression. */
1053 -1, /* ast_array_index doesn't convert to ir_expression. */
1054 -1, /* ast_function_call doesn't conv to ir_expression. */
1055 -1, /* ast_identifier doesn't convert to ir_expression. */
1056 -1, /* ast_int_constant doesn't convert to ir_expression. */
1057 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1058 -1, /* ast_float_constant doesn't conv to ir_expression. */
1059 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1060 -1, /* ast_sequence doesn't convert to ir_expression. */
1062 ir_rvalue
*result
= NULL
;
1064 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1065 bool error_emitted
= false;
1068 loc
= this->get_location();
1070 switch (this->oper
) {
1072 assert(!"ast_aggregate: Should never get here.");
1076 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1077 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1079 result
= do_assignment(instructions
, state
,
1080 this->subexpressions
[0]->non_lvalue_description
,
1081 op
[0], op
[1], false,
1082 this->subexpressions
[0]->get_location());
1083 error_emitted
= result
->type
->is_error();
1088 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1090 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1092 error_emitted
= type
->is_error();
1098 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1100 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1102 error_emitted
= type
->is_error();
1104 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1112 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1113 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1115 type
= arithmetic_result_type(op
[0], op
[1],
1116 (this->oper
== ast_mul
),
1118 error_emitted
= type
->is_error();
1120 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1125 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1126 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1128 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1130 assert(operations
[this->oper
] == ir_binop_mod
);
1132 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1134 error_emitted
= type
->is_error();
1139 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1140 error_emitted
= true;
1143 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1144 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1145 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1147 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1149 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1156 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1157 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1159 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1161 /* The relational operators must either generate an error or result
1162 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1164 assert(type
->is_error()
1165 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1166 && type
->is_scalar()));
1168 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1170 error_emitted
= type
->is_error();
1175 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1176 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1178 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1180 * "The equality operators equal (==), and not equal (!=)
1181 * operate on all types. They result in a scalar Boolean. If
1182 * the operand types do not match, then there must be a
1183 * conversion from Section 4.1.10 "Implicit Conversions"
1184 * applied to one operand that can make them match, in which
1185 * case this conversion is done."
1187 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1188 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1189 || (op
[0]->type
!= op
[1]->type
)) {
1190 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1191 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1192 error_emitted
= true;
1193 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1194 !state
->check_version(120, 300, &loc
,
1195 "array comparisons forbidden")) {
1196 error_emitted
= true;
1199 if (error_emitted
) {
1200 result
= new(ctx
) ir_constant(false);
1202 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1203 assert(result
->type
== glsl_type::bool_type
);
1210 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1211 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1212 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1214 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1216 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1220 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1222 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1223 error_emitted
= true;
1226 if (!op
[0]->type
->is_integer()) {
1227 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1228 error_emitted
= true;
1231 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1232 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1235 case ast_logic_and
: {
1236 exec_list rhs_instructions
;
1237 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1238 "LHS", &error_emitted
);
1239 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1240 "RHS", &error_emitted
);
1242 if (rhs_instructions
.is_empty()) {
1243 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1244 type
= result
->type
;
1246 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1249 instructions
->push_tail(tmp
);
1251 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1252 instructions
->push_tail(stmt
);
1254 stmt
->then_instructions
.append_list(&rhs_instructions
);
1255 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1256 ir_assignment
*const then_assign
=
1257 new(ctx
) ir_assignment(then_deref
, op
[1]);
1258 stmt
->then_instructions
.push_tail(then_assign
);
1260 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1261 ir_assignment
*const else_assign
=
1262 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1263 stmt
->else_instructions
.push_tail(else_assign
);
1265 result
= new(ctx
) ir_dereference_variable(tmp
);
1271 case ast_logic_or
: {
1272 exec_list rhs_instructions
;
1273 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1274 "LHS", &error_emitted
);
1275 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1276 "RHS", &error_emitted
);
1278 if (rhs_instructions
.is_empty()) {
1279 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1280 type
= result
->type
;
1282 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1285 instructions
->push_tail(tmp
);
1287 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1288 instructions
->push_tail(stmt
);
1290 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1291 ir_assignment
*const then_assign
=
1292 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1293 stmt
->then_instructions
.push_tail(then_assign
);
1295 stmt
->else_instructions
.append_list(&rhs_instructions
);
1296 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1297 ir_assignment
*const else_assign
=
1298 new(ctx
) ir_assignment(else_deref
, op
[1]);
1299 stmt
->else_instructions
.push_tail(else_assign
);
1301 result
= new(ctx
) ir_dereference_variable(tmp
);
1308 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1310 * "The logical binary operators and (&&), or ( | | ), and
1311 * exclusive or (^^). They operate only on two Boolean
1312 * expressions and result in a Boolean expression."
1314 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1316 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1319 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1324 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1325 "operand", &error_emitted
);
1327 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1331 case ast_mul_assign
:
1332 case ast_div_assign
:
1333 case ast_add_assign
:
1334 case ast_sub_assign
: {
1335 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1336 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1338 type
= arithmetic_result_type(op
[0], op
[1],
1339 (this->oper
== ast_mul_assign
),
1342 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1345 result
= do_assignment(instructions
, state
,
1346 this->subexpressions
[0]->non_lvalue_description
,
1347 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1348 this->subexpressions
[0]->get_location());
1349 error_emitted
= (op
[0]->type
->is_error());
1351 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1352 * explicitly test for this because none of the binary expression
1353 * operators allow array operands either.
1359 case ast_mod_assign
: {
1360 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1361 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1363 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1365 assert(operations
[this->oper
] == ir_binop_mod
);
1367 ir_rvalue
*temp_rhs
;
1368 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1371 result
= do_assignment(instructions
, state
,
1372 this->subexpressions
[0]->non_lvalue_description
,
1373 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1374 this->subexpressions
[0]->get_location());
1375 error_emitted
= type
->is_error();
1380 case ast_rs_assign
: {
1381 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1382 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1383 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1385 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1386 type
, op
[0], op
[1]);
1387 result
= do_assignment(instructions
, state
,
1388 this->subexpressions
[0]->non_lvalue_description
,
1389 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1390 this->subexpressions
[0]->get_location());
1391 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1395 case ast_and_assign
:
1396 case ast_xor_assign
:
1397 case ast_or_assign
: {
1398 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1399 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1400 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1402 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1403 type
, op
[0], op
[1]);
1404 result
= do_assignment(instructions
, state
,
1405 this->subexpressions
[0]->non_lvalue_description
,
1406 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1407 this->subexpressions
[0]->get_location());
1408 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1412 case ast_conditional
: {
1413 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1415 * "The ternary selection operator (?:). It operates on three
1416 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1417 * first expression, which must result in a scalar Boolean."
1419 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1420 "condition", &error_emitted
);
1422 /* The :? operator is implemented by generating an anonymous temporary
1423 * followed by an if-statement. The last instruction in each branch of
1424 * the if-statement assigns a value to the anonymous temporary. This
1425 * temporary is the r-value of the expression.
1427 exec_list then_instructions
;
1428 exec_list else_instructions
;
1430 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1431 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1433 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1435 * "The second and third expressions can be any type, as
1436 * long their types match, or there is a conversion in
1437 * Section 4.1.10 "Implicit Conversions" that can be applied
1438 * to one of the expressions to make their types match. This
1439 * resulting matching type is the type of the entire
1442 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1443 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1444 || (op
[1]->type
!= op
[2]->type
)) {
1445 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1447 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1448 "operator must have matching types");
1449 error_emitted
= true;
1450 type
= glsl_type::error_type
;
1455 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1457 * "The second and third expressions must be the same type, but can
1458 * be of any type other than an array."
1460 if (type
->is_array() &&
1461 !state
->check_version(120, 300, &loc
,
1462 "second and third operands of ?: operator "
1463 "cannot be arrays")) {
1464 error_emitted
= true;
1467 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1468 ir_constant
*then_val
= op
[1]->constant_expression_value();
1469 ir_constant
*else_val
= op
[2]->constant_expression_value();
1471 if (then_instructions
.is_empty()
1472 && else_instructions
.is_empty()
1473 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1474 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1476 ir_variable
*const tmp
=
1477 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1478 instructions
->push_tail(tmp
);
1480 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1481 instructions
->push_tail(stmt
);
1483 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1484 ir_dereference
*const then_deref
=
1485 new(ctx
) ir_dereference_variable(tmp
);
1486 ir_assignment
*const then_assign
=
1487 new(ctx
) ir_assignment(then_deref
, op
[1]);
1488 stmt
->then_instructions
.push_tail(then_assign
);
1490 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1491 ir_dereference
*const else_deref
=
1492 new(ctx
) ir_dereference_variable(tmp
);
1493 ir_assignment
*const else_assign
=
1494 new(ctx
) ir_assignment(else_deref
, op
[2]);
1495 stmt
->else_instructions
.push_tail(else_assign
);
1497 result
= new(ctx
) ir_dereference_variable(tmp
);
1504 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1505 ? "pre-increment operation" : "pre-decrement operation";
1507 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1508 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1510 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1512 ir_rvalue
*temp_rhs
;
1513 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1516 result
= do_assignment(instructions
, state
,
1517 this->subexpressions
[0]->non_lvalue_description
,
1518 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1519 this->subexpressions
[0]->get_location());
1520 error_emitted
= op
[0]->type
->is_error();
1525 case ast_post_dec
: {
1526 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1527 ? "post-increment operation" : "post-decrement operation";
1528 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1529 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1531 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1533 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1535 ir_rvalue
*temp_rhs
;
1536 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1539 /* Get a temporary of a copy of the lvalue before it's modified.
1540 * This may get thrown away later.
1542 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1544 (void)do_assignment(instructions
, state
,
1545 this->subexpressions
[0]->non_lvalue_description
,
1546 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1547 this->subexpressions
[0]->get_location());
1549 error_emitted
= op
[0]->type
->is_error();
1553 case ast_field_selection
:
1554 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1557 case ast_array_index
: {
1558 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1560 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1561 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1563 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1566 if (result
->type
->is_error())
1567 error_emitted
= true;
1572 case ast_function_call
:
1573 /* Should *NEVER* get here. ast_function_call should always be handled
1574 * by ast_function_expression::hir.
1579 case ast_identifier
: {
1580 /* ast_identifier can appear several places in a full abstract syntax
1581 * tree. This particular use must be at location specified in the grammar
1582 * as 'variable_identifier'.
1585 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1589 result
= new(ctx
) ir_dereference_variable(var
);
1591 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1592 this->primary_expression
.identifier
);
1594 result
= ir_rvalue::error_value(ctx
);
1595 error_emitted
= true;
1600 case ast_int_constant
:
1601 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1604 case ast_uint_constant
:
1605 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1608 case ast_float_constant
:
1609 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1612 case ast_bool_constant
:
1613 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1616 case ast_sequence
: {
1617 /* It should not be possible to generate a sequence in the AST without
1618 * any expressions in it.
1620 assert(!this->expressions
.is_empty());
1622 /* The r-value of a sequence is the last expression in the sequence. If
1623 * the other expressions in the sequence do not have side-effects (and
1624 * therefore add instructions to the instruction list), they get dropped
1627 exec_node
*previous_tail_pred
= NULL
;
1628 YYLTYPE previous_operand_loc
= loc
;
1630 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1631 /* If one of the operands of comma operator does not generate any
1632 * code, we want to emit a warning. At each pass through the loop
1633 * previous_tail_pred will point to the last instruction in the
1634 * stream *before* processing the previous operand. Naturally,
1635 * instructions->tail_pred will point to the last instruction in the
1636 * stream *after* processing the previous operand. If the two
1637 * pointers match, then the previous operand had no effect.
1639 * The warning behavior here differs slightly from GCC. GCC will
1640 * only emit a warning if none of the left-hand operands have an
1641 * effect. However, it will emit a warning for each. I believe that
1642 * there are some cases in C (especially with GCC extensions) where
1643 * it is useful to have an intermediate step in a sequence have no
1644 * effect, but I don't think these cases exist in GLSL. Either way,
1645 * it would be a giant hassle to replicate that behavior.
1647 if (previous_tail_pred
== instructions
->tail_pred
) {
1648 _mesa_glsl_warning(&previous_operand_loc
, state
,
1649 "left-hand operand of comma expression has "
1653 /* tail_pred is directly accessed instead of using the get_tail()
1654 * method for performance reasons. get_tail() has extra code to
1655 * return NULL when the list is empty. We don't care about that
1656 * here, so using tail_pred directly is fine.
1658 previous_tail_pred
= instructions
->tail_pred
;
1659 previous_operand_loc
= ast
->get_location();
1661 result
= ast
->hir(instructions
, state
);
1664 /* Any errors should have already been emitted in the loop above.
1666 error_emitted
= true;
1670 type
= NULL
; /* use result->type, not type. */
1671 assert(result
!= NULL
);
1673 if (result
->type
->is_error() && !error_emitted
)
1674 _mesa_glsl_error(& loc
, state
, "type mismatch");
1681 ast_expression_statement::hir(exec_list
*instructions
,
1682 struct _mesa_glsl_parse_state
*state
)
1684 /* It is possible to have expression statements that don't have an
1685 * expression. This is the solitary semicolon:
1687 * for (i = 0; i < 5; i++)
1690 * In this case the expression will be NULL. Test for NULL and don't do
1691 * anything in that case.
1693 if (expression
!= NULL
)
1694 expression
->hir(instructions
, state
);
1696 /* Statements do not have r-values.
1703 ast_compound_statement::hir(exec_list
*instructions
,
1704 struct _mesa_glsl_parse_state
*state
)
1707 state
->symbols
->push_scope();
1709 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1710 ast
->hir(instructions
, state
);
1713 state
->symbols
->pop_scope();
1715 /* Compound statements do not have r-values.
1721 static const glsl_type
*
1722 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1723 struct _mesa_glsl_parse_state
*state
)
1725 unsigned length
= 0;
1728 return glsl_type::error_type
;
1730 /* From page 19 (page 25) of the GLSL 1.20 spec:
1732 * "Only one-dimensional arrays may be declared."
1734 if (base
->is_array()) {
1735 _mesa_glsl_error(loc
, state
,
1736 "invalid array of `%s' (only one-dimensional arrays "
1739 return glsl_type::error_type
;
1742 if (array_size
!= NULL
) {
1743 exec_list dummy_instructions
;
1744 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1745 YYLTYPE loc
= array_size
->get_location();
1748 if (!ir
->type
->is_integer()) {
1749 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1750 } else if (!ir
->type
->is_scalar()) {
1751 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1753 ir_constant
*const size
= ir
->constant_expression_value();
1756 _mesa_glsl_error(& loc
, state
, "array size must be a "
1757 "constant valued expression");
1758 } else if (size
->value
.i
[0] <= 0) {
1759 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1761 assert(size
->type
== ir
->type
);
1762 length
= size
->value
.u
[0];
1764 /* If the array size is const (and we've verified that
1765 * it is) then no instructions should have been emitted
1766 * when we converted it to HIR. If they were emitted,
1767 * then either the array size isn't const after all, or
1768 * we are emitting unnecessary instructions.
1770 assert(dummy_instructions
.is_empty());
1774 } else if (state
->es_shader
) {
1775 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1776 * array declarations have been removed from the language.
1778 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1779 "allowed in GLSL ES 1.00");
1782 const glsl_type
*array_type
= glsl_type::get_array_instance(base
, length
);
1783 return array_type
!= NULL
? array_type
: glsl_type::error_type
;
1788 ast_type_specifier::glsl_type(const char **name
,
1789 struct _mesa_glsl_parse_state
*state
) const
1791 const struct glsl_type
*type
;
1793 type
= state
->symbols
->get_type(this->type_name
);
1794 *name
= this->type_name
;
1796 if (this->is_array
) {
1797 YYLTYPE loc
= this->get_location();
1798 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1806 * Determine whether a toplevel variable declaration declares a varying. This
1807 * function operates by examining the variable's mode and the shader target,
1808 * so it correctly identifies linkage variables regardless of whether they are
1809 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1811 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1812 * this function will produce undefined results.
1815 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1819 return var
->mode
== ir_var_shader_out
;
1820 case fragment_shader
:
1821 return var
->mode
== ir_var_shader_in
;
1823 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1829 * Matrix layout qualifiers are only allowed on certain types
1832 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1834 const glsl_type
*type
)
1836 if (!type
->is_matrix() && !type
->is_record()) {
1837 _mesa_glsl_error(loc
, state
,
1838 "uniform block layout qualifiers row_major and "
1839 "column_major can only be applied to matrix and "
1841 } else if (type
->is_record()) {
1842 /* We allow 'layout(row_major)' on structure types because it's the only
1843 * way to get row-major layouts on matrices contained in structures.
1845 _mesa_glsl_warning(loc
, state
,
1846 "uniform block layout qualifiers row_major and "
1847 "column_major applied to structure types is not "
1848 "strictly conformant and my be rejected by other "
1854 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
1857 const ast_type_qualifier
*qual
)
1859 if (var
->mode
!= ir_var_uniform
) {
1860 _mesa_glsl_error(loc
, state
,
1861 "the \"binding\" qualifier only applies to uniforms");
1865 if (qual
->binding
< 0) {
1866 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
1870 const struct gl_context
*const ctx
= state
->ctx
;
1871 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
1872 unsigned max_index
= qual
->binding
+ elements
- 1;
1874 if (var
->type
->is_interface()) {
1875 /* UBOs. From page 60 of the GLSL 4.20 specification:
1876 * "If the binding point for any uniform block instance is less than zero,
1877 * or greater than or equal to the implementation-dependent maximum
1878 * number of uniform buffer bindings, a compilation error will occur.
1879 * When the binding identifier is used with a uniform block instanced as
1880 * an array of size N, all elements of the array from binding through
1881 * binding + N – 1 must be within this range."
1883 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
1885 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
1886 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
1887 "the maximum number of UBO binding points (%d)",
1888 qual
->binding
, elements
,
1889 ctx
->Const
.MaxUniformBufferBindings
);
1892 } else if (var
->type
->is_sampler() ||
1893 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
1894 /* Samplers. From page 63 of the GLSL 4.20 specification:
1895 * "If the binding is less than zero, or greater than or equal to the
1896 * implementation-dependent maximum supported number of units, a
1897 * compilation error will occur. When the binding identifier is used
1898 * with an array of size N, all elements of the array from binding
1899 * through binding + N - 1 must be within this range."
1902 switch (state
->target
) {
1904 limit
= ctx
->Const
.VertexProgram
.MaxTextureImageUnits
;
1906 case geometry_shader
:
1907 limit
= ctx
->Const
.GeometryProgram
.MaxTextureImageUnits
;
1909 case fragment_shader
:
1910 limit
= ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
;
1914 if (max_index
>= limit
) {
1915 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
1916 "exceeds the maximum number of texture image units "
1917 "(%d)", qual
->binding
, elements
, limit
);
1922 _mesa_glsl_error(loc
, state
,
1923 "the \"binding\" qualifier only applies to uniform "
1924 "blocks, samplers, or arrays of samplers");
1932 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1934 struct _mesa_glsl_parse_state
*state
,
1936 bool ubo_qualifiers_valid
,
1939 if (qual
->flags
.q
.invariant
) {
1941 _mesa_glsl_error(loc
, state
,
1942 "variable `%s' may not be redeclared "
1943 "`invariant' after being used",
1950 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1951 || qual
->flags
.q
.uniform
1952 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1955 if (qual
->flags
.q
.centroid
)
1958 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1959 var
->type
= glsl_type::error_type
;
1960 _mesa_glsl_error(loc
, state
,
1961 "`attribute' variables may not be declared in the "
1963 _mesa_glsl_shader_target_name(state
->target
));
1966 /* If there is no qualifier that changes the mode of the variable, leave
1967 * the setting alone.
1969 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1970 var
->mode
= ir_var_function_inout
;
1971 else if (qual
->flags
.q
.in
)
1972 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
1973 else if (qual
->flags
.q
.attribute
1974 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1975 var
->mode
= ir_var_shader_in
;
1976 else if (qual
->flags
.q
.out
)
1977 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
1978 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
1979 var
->mode
= ir_var_shader_out
;
1980 else if (qual
->flags
.q
.uniform
)
1981 var
->mode
= ir_var_uniform
;
1983 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
1984 /* This variable is being used to link data between shader stages (in
1985 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
1986 * that is allowed for such purposes.
1988 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1990 * "The varying qualifier can be used only with the data types
1991 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1994 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
1995 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
1997 * "Fragment inputs can only be signed and unsigned integers and
1998 * integer vectors, float, floating-point vectors, matrices, or
1999 * arrays of these. Structures cannot be input.
2001 * Similar text exists in the section on vertex shader outputs.
2003 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2004 * 3.00 spec allows structs as well. Varying structs are also allowed
2007 switch (var
->type
->get_scalar_type()->base_type
) {
2008 case GLSL_TYPE_FLOAT
:
2009 /* Ok in all GLSL versions */
2011 case GLSL_TYPE_UINT
:
2013 if (state
->is_version(130, 300))
2015 _mesa_glsl_error(loc
, state
,
2016 "varying variables must be of base type float in %s",
2017 state
->get_version_string());
2019 case GLSL_TYPE_STRUCT
:
2020 if (state
->is_version(150, 300))
2022 _mesa_glsl_error(loc
, state
,
2023 "varying variables may not be of type struct");
2026 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2031 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2032 switch (state
->target
) {
2034 if (var
->mode
== ir_var_shader_out
)
2035 var
->invariant
= true;
2037 case geometry_shader
:
2038 if ((var
->mode
== ir_var_shader_in
)
2039 || (var
->mode
== ir_var_shader_out
))
2040 var
->invariant
= true;
2042 case fragment_shader
:
2043 if (var
->mode
== ir_var_shader_in
)
2044 var
->invariant
= true;
2049 if (qual
->flags
.q
.flat
)
2050 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2051 else if (qual
->flags
.q
.noperspective
)
2052 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2053 else if (qual
->flags
.q
.smooth
)
2054 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2056 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2058 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
2059 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
) &&
2060 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)) {
2061 _mesa_glsl_error(loc
, state
,
2062 "interpolation qualifier `%s' can only be applied to "
2063 "vertex shader outputs and fragment shader inputs",
2064 var
->interpolation_string());
2067 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2068 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2069 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2070 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2071 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2072 ? "origin_upper_left" : "pixel_center_integer";
2074 _mesa_glsl_error(loc
, state
,
2075 "layout qualifier `%s' can only be applied to "
2076 "fragment shader input `gl_FragCoord'",
2080 if (qual
->flags
.q
.explicit_location
) {
2081 const bool global_scope
= (state
->current_function
== NULL
);
2083 const char *string
= "";
2085 /* In the vertex shader only shader inputs can be given explicit
2088 * In the fragment shader only shader outputs can be given explicit
2091 switch (state
->target
) {
2093 if (!global_scope
|| (var
->mode
!= ir_var_shader_in
)) {
2099 case geometry_shader
:
2100 _mesa_glsl_error(loc
, state
,
2101 "geometry shader variables cannot be given "
2102 "explicit locations");
2105 case fragment_shader
:
2106 if (!global_scope
|| (var
->mode
!= ir_var_shader_out
)) {
2114 _mesa_glsl_error(loc
, state
,
2115 "only %s shader %s variables can be given an "
2116 "explicit location",
2117 _mesa_glsl_shader_target_name(state
->target
),
2120 var
->explicit_location
= true;
2122 /* This bit of silliness is needed because invalid explicit locations
2123 * are supposed to be flagged during linking. Small negative values
2124 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2125 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2126 * The linker needs to be able to differentiate these cases. This
2127 * ensures that negative values stay negative.
2129 if (qual
->location
>= 0) {
2130 var
->location
= (state
->target
== vertex_shader
)
2131 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2132 : (qual
->location
+ FRAG_RESULT_DATA0
);
2134 var
->location
= qual
->location
;
2137 if (qual
->flags
.q
.explicit_index
) {
2138 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2139 * Layout Qualifiers):
2141 * "It is also a compile-time error if a fragment shader
2142 * sets a layout index to less than 0 or greater than 1."
2144 * Older specifications don't mandate a behavior; we take
2145 * this as a clarification and always generate the error.
2147 if (qual
->index
< 0 || qual
->index
> 1) {
2148 _mesa_glsl_error(loc
, state
,
2149 "explicit index may only be 0 or 1");
2151 var
->explicit_index
= true;
2152 var
->index
= qual
->index
;
2156 } else if (qual
->flags
.q
.explicit_index
) {
2157 _mesa_glsl_error(loc
, state
,
2158 "explicit index requires explicit location");
2161 if (qual
->flags
.q
.explicit_binding
&&
2162 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2163 var
->explicit_binding
= true;
2164 var
->binding
= qual
->binding
;
2167 /* Does the declaration use the deprecated 'attribute' or 'varying'
2170 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2171 || qual
->flags
.q
.varying
;
2173 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2174 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2175 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2176 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2177 * These extensions and all following extensions that add the 'layout'
2178 * keyword have been modified to require the use of 'in' or 'out'.
2180 * The following extension do not allow the deprecated keywords:
2182 * GL_AMD_conservative_depth
2183 * GL_ARB_conservative_depth
2184 * GL_ARB_gpu_shader5
2185 * GL_ARB_separate_shader_objects
2186 * GL_ARB_tesselation_shader
2187 * GL_ARB_transform_feedback3
2188 * GL_ARB_uniform_buffer_object
2190 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2191 * allow layout with the deprecated keywords.
2193 const bool relaxed_layout_qualifier_checking
=
2194 state
->ARB_fragment_coord_conventions_enable
;
2196 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2197 if (relaxed_layout_qualifier_checking
) {
2198 _mesa_glsl_warning(loc
, state
,
2199 "`layout' qualifier may not be used with "
2200 "`attribute' or `varying'");
2202 _mesa_glsl_error(loc
, state
,
2203 "`layout' qualifier may not be used with "
2204 "`attribute' or `varying'");
2208 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2209 * AMD_conservative_depth.
2211 int depth_layout_count
= qual
->flags
.q
.depth_any
2212 + qual
->flags
.q
.depth_greater
2213 + qual
->flags
.q
.depth_less
2214 + qual
->flags
.q
.depth_unchanged
;
2215 if (depth_layout_count
> 0
2216 && !state
->AMD_conservative_depth_enable
2217 && !state
->ARB_conservative_depth_enable
) {
2218 _mesa_glsl_error(loc
, state
,
2219 "extension GL_AMD_conservative_depth or "
2220 "GL_ARB_conservative_depth must be enabled "
2221 "to use depth layout qualifiers");
2222 } else if (depth_layout_count
> 0
2223 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2224 _mesa_glsl_error(loc
, state
,
2225 "depth layout qualifiers can be applied only to "
2227 } else if (depth_layout_count
> 1
2228 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2229 _mesa_glsl_error(loc
, state
,
2230 "at most one depth layout qualifier can be applied to "
2233 if (qual
->flags
.q
.depth_any
)
2234 var
->depth_layout
= ir_depth_layout_any
;
2235 else if (qual
->flags
.q
.depth_greater
)
2236 var
->depth_layout
= ir_depth_layout_greater
;
2237 else if (qual
->flags
.q
.depth_less
)
2238 var
->depth_layout
= ir_depth_layout_less
;
2239 else if (qual
->flags
.q
.depth_unchanged
)
2240 var
->depth_layout
= ir_depth_layout_unchanged
;
2242 var
->depth_layout
= ir_depth_layout_none
;
2244 if (qual
->flags
.q
.std140
||
2245 qual
->flags
.q
.packed
||
2246 qual
->flags
.q
.shared
) {
2247 _mesa_glsl_error(loc
, state
,
2248 "uniform block layout qualifiers std140, packed, and "
2249 "shared can only be applied to uniform blocks, not "
2253 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2254 if (!ubo_qualifiers_valid
) {
2255 _mesa_glsl_error(loc
, state
,
2256 "uniform block layout qualifiers row_major and "
2257 "column_major can only be applied to uniform block "
2260 validate_matrix_layout_for_type(state
, loc
, var
->type
);
2265 * Get the variable that is being redeclared by this declaration
2267 * Semantic checks to verify the validity of the redeclaration are also
2268 * performed. If semantic checks fail, compilation error will be emitted via
2269 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2272 * A pointer to an existing variable in the current scope if the declaration
2273 * is a redeclaration, \c NULL otherwise.
2276 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2277 struct _mesa_glsl_parse_state
*state
)
2279 /* Check if this declaration is actually a re-declaration, either to
2280 * resize an array or add qualifiers to an existing variable.
2282 * This is allowed for variables in the current scope, or when at
2283 * global scope (for built-ins in the implicit outer scope).
2285 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2286 if (earlier
== NULL
||
2287 (state
->current_function
!= NULL
&&
2288 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2293 YYLTYPE loc
= decl
->get_location();
2295 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2297 * "It is legal to declare an array without a size and then
2298 * later re-declare the same name as an array of the same
2299 * type and specify a size."
2301 if ((earlier
->type
->array_size() == 0)
2302 && var
->type
->is_array()
2303 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2304 /* FINISHME: This doesn't match the qualifiers on the two
2305 * FINISHME: declarations. It's not 100% clear whether this is
2306 * FINISHME: required or not.
2309 const unsigned size
= unsigned(var
->type
->array_size());
2310 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2311 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2312 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2314 earlier
->max_array_access
);
2317 earlier
->type
= var
->type
;
2320 } else if (state
->ARB_fragment_coord_conventions_enable
2321 && strcmp(var
->name
, "gl_FragCoord") == 0
2322 && earlier
->type
== var
->type
2323 && earlier
->mode
== var
->mode
) {
2324 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2327 earlier
->origin_upper_left
= var
->origin_upper_left
;
2328 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2330 /* According to section 4.3.7 of the GLSL 1.30 spec,
2331 * the following built-in varaibles can be redeclared with an
2332 * interpolation qualifier:
2335 * * gl_FrontSecondaryColor
2336 * * gl_BackSecondaryColor
2338 * * gl_SecondaryColor
2340 } else if (state
->is_version(130, 0)
2341 && (strcmp(var
->name
, "gl_FrontColor") == 0
2342 || strcmp(var
->name
, "gl_BackColor") == 0
2343 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2344 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2345 || strcmp(var
->name
, "gl_Color") == 0
2346 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2347 && earlier
->type
== var
->type
2348 && earlier
->mode
== var
->mode
) {
2349 earlier
->interpolation
= var
->interpolation
;
2351 /* Layout qualifiers for gl_FragDepth. */
2352 } else if ((state
->AMD_conservative_depth_enable
||
2353 state
->ARB_conservative_depth_enable
)
2354 && strcmp(var
->name
, "gl_FragDepth") == 0
2355 && earlier
->type
== var
->type
2356 && earlier
->mode
== var
->mode
) {
2358 /** From the AMD_conservative_depth spec:
2359 * Within any shader, the first redeclarations of gl_FragDepth
2360 * must appear before any use of gl_FragDepth.
2362 if (earlier
->used
) {
2363 _mesa_glsl_error(&loc
, state
,
2364 "the first redeclaration of gl_FragDepth "
2365 "must appear before any use of gl_FragDepth");
2368 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2369 if (earlier
->depth_layout
!= ir_depth_layout_none
2370 && earlier
->depth_layout
!= var
->depth_layout
) {
2371 _mesa_glsl_error(&loc
, state
,
2372 "gl_FragDepth: depth layout is declared here "
2373 "as '%s, but it was previously declared as "
2375 depth_layout_string(var
->depth_layout
),
2376 depth_layout_string(earlier
->depth_layout
));
2379 earlier
->depth_layout
= var
->depth_layout
;
2382 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2389 * Generate the IR for an initializer in a variable declaration
2392 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2393 ast_fully_specified_type
*type
,
2394 exec_list
*initializer_instructions
,
2395 struct _mesa_glsl_parse_state
*state
)
2397 ir_rvalue
*result
= NULL
;
2399 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2401 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2403 * "All uniform variables are read-only and are initialized either
2404 * directly by an application via API commands, or indirectly by
2407 if (var
->mode
== ir_var_uniform
) {
2408 state
->check_version(120, 0, &initializer_loc
,
2409 "cannot initialize uniforms");
2412 if (var
->type
->is_sampler()) {
2413 _mesa_glsl_error(& initializer_loc
, state
,
2414 "cannot initialize samplers");
2417 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2418 _mesa_glsl_error(& initializer_loc
, state
,
2419 "cannot initialize %s shader input / %s",
2420 _mesa_glsl_shader_target_name(state
->target
),
2421 (state
->target
== vertex_shader
)
2422 ? "attribute" : "varying");
2425 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2426 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2429 /* Calculate the constant value if this is a const or uniform
2432 if (type
->qualifier
.flags
.q
.constant
2433 || type
->qualifier
.flags
.q
.uniform
) {
2434 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2435 if (new_rhs
!= NULL
) {
2438 ir_constant
*constant_value
= rhs
->constant_expression_value();
2439 if (!constant_value
) {
2440 /* If ARB_shading_language_420pack is enabled, initializers of
2441 * const-qualified local variables do not have to be constant
2442 * expressions. Const-qualified global variables must still be
2443 * initialized with constant expressions.
2445 if (!state
->ARB_shading_language_420pack_enable
2446 || state
->current_function
== NULL
) {
2447 _mesa_glsl_error(& initializer_loc
, state
,
2448 "initializer of %s variable `%s' must be a "
2449 "constant expression",
2450 (type
->qualifier
.flags
.q
.constant
)
2451 ? "const" : "uniform",
2453 if (var
->type
->is_numeric()) {
2454 /* Reduce cascading errors. */
2455 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2459 rhs
= constant_value
;
2460 var
->constant_value
= constant_value
;
2463 _mesa_glsl_error(&initializer_loc
, state
,
2464 "initializer of type %s cannot be assigned to "
2465 "variable of type %s",
2466 rhs
->type
->name
, var
->type
->name
);
2467 if (var
->type
->is_numeric()) {
2468 /* Reduce cascading errors. */
2469 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2474 if (rhs
&& !rhs
->type
->is_error()) {
2475 bool temp
= var
->read_only
;
2476 if (type
->qualifier
.flags
.q
.constant
)
2477 var
->read_only
= false;
2479 /* Never emit code to initialize a uniform.
2481 const glsl_type
*initializer_type
;
2482 if (!type
->qualifier
.flags
.q
.uniform
) {
2483 result
= do_assignment(initializer_instructions
, state
,
2486 type
->get_location());
2487 initializer_type
= result
->type
;
2489 initializer_type
= rhs
->type
;
2491 var
->constant_initializer
= rhs
->constant_expression_value();
2492 var
->has_initializer
= true;
2494 /* If the declared variable is an unsized array, it must inherrit
2495 * its full type from the initializer. A declaration such as
2497 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2501 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2503 * The assignment generated in the if-statement (below) will also
2504 * automatically handle this case for non-uniforms.
2506 * If the declared variable is not an array, the types must
2507 * already match exactly. As a result, the type assignment
2508 * here can be done unconditionally. For non-uniforms the call
2509 * to do_assignment can change the type of the initializer (via
2510 * the implicit conversion rules). For uniforms the initializer
2511 * must be a constant expression, and the type of that expression
2512 * was validated above.
2514 var
->type
= initializer_type
;
2516 var
->read_only
= temp
;
2523 ast_declarator_list::hir(exec_list
*instructions
,
2524 struct _mesa_glsl_parse_state
*state
)
2527 const struct glsl_type
*decl_type
;
2528 const char *type_name
= NULL
;
2529 ir_rvalue
*result
= NULL
;
2530 YYLTYPE loc
= this->get_location();
2532 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2534 * "To ensure that a particular output variable is invariant, it is
2535 * necessary to use the invariant qualifier. It can either be used to
2536 * qualify a previously declared variable as being invariant
2538 * invariant gl_Position; // make existing gl_Position be invariant"
2540 * In these cases the parser will set the 'invariant' flag in the declarator
2541 * list, and the type will be NULL.
2543 if (this->invariant
) {
2544 assert(this->type
== NULL
);
2546 if (state
->current_function
!= NULL
) {
2547 _mesa_glsl_error(& loc
, state
,
2548 "all uses of `invariant' keyword must be at global "
2552 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2553 assert(!decl
->is_array
);
2554 assert(decl
->array_size
== NULL
);
2555 assert(decl
->initializer
== NULL
);
2557 ir_variable
*const earlier
=
2558 state
->symbols
->get_variable(decl
->identifier
);
2559 if (earlier
== NULL
) {
2560 _mesa_glsl_error(& loc
, state
,
2561 "undeclared variable `%s' cannot be marked "
2562 "invariant", decl
->identifier
);
2563 } else if ((state
->target
== vertex_shader
)
2564 && (earlier
->mode
!= ir_var_shader_out
)) {
2565 _mesa_glsl_error(& loc
, state
,
2566 "`%s' cannot be marked invariant, vertex shader "
2567 "outputs only", decl
->identifier
);
2568 } else if ((state
->target
== fragment_shader
)
2569 && (earlier
->mode
!= ir_var_shader_in
)) {
2570 _mesa_glsl_error(& loc
, state
,
2571 "`%s' cannot be marked invariant, fragment shader "
2572 "inputs only", decl
->identifier
);
2573 } else if (earlier
->used
) {
2574 _mesa_glsl_error(& loc
, state
,
2575 "variable `%s' may not be redeclared "
2576 "`invariant' after being used",
2579 earlier
->invariant
= true;
2583 /* Invariant redeclarations do not have r-values.
2588 assert(this->type
!= NULL
);
2589 assert(!this->invariant
);
2591 /* The type specifier may contain a structure definition. Process that
2592 * before any of the variable declarations.
2594 (void) this->type
->specifier
->hir(instructions
, state
);
2596 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2597 if (this->declarations
.is_empty()) {
2598 /* If there is no structure involved in the program text, there are two
2599 * possible scenarios:
2601 * - The program text contained something like 'vec4;'. This is an
2602 * empty declaration. It is valid but weird. Emit a warning.
2604 * - The program text contained something like 'S;' and 'S' is not the
2605 * name of a known structure type. This is both invalid and weird.
2608 * Note that if decl_type is NULL and there is a structure involved,
2609 * there must have been some sort of error with the structure. In this
2610 * case we assume that an error was already generated on this line of
2611 * code for the structure. There is no need to generate an additional,
2614 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2616 if (this->type
->specifier
->structure
== NULL
) {
2617 if (decl_type
!= NULL
) {
2618 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2620 _mesa_glsl_error(&loc
, state
,
2621 "invalid type `%s' in empty declaration",
2626 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
2627 this->type
->specifier
->structure
!= NULL
) {
2628 _mesa_glsl_error(&loc
, state
, "precision qualifiers can't be applied "
2633 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2634 const struct glsl_type
*var_type
;
2637 /* FINISHME: Emit a warning if a variable declaration shadows a
2638 * FINISHME: declaration at a higher scope.
2641 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2642 if (type_name
!= NULL
) {
2643 _mesa_glsl_error(& loc
, state
,
2644 "invalid type `%s' in declaration of `%s'",
2645 type_name
, decl
->identifier
);
2647 _mesa_glsl_error(& loc
, state
,
2648 "invalid type in declaration of `%s'",
2654 if (decl
->is_array
) {
2655 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2657 if (var_type
->is_error())
2660 var_type
= decl_type
;
2663 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2665 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2667 * "Global variables can only use the qualifiers const,
2668 * attribute, uni form, or varying. Only one may be
2671 * Local variables can only use the qualifier const."
2673 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2674 * any extension that adds the 'layout' keyword.
2676 if (!state
->is_version(130, 300)
2677 && !state
->ARB_explicit_attrib_location_enable
2678 && !state
->ARB_fragment_coord_conventions_enable
) {
2679 if (this->type
->qualifier
.flags
.q
.out
) {
2680 _mesa_glsl_error(& loc
, state
,
2681 "`out' qualifier in declaration of `%s' "
2682 "only valid for function parameters in %s",
2683 decl
->identifier
, state
->get_version_string());
2685 if (this->type
->qualifier
.flags
.q
.in
) {
2686 _mesa_glsl_error(& loc
, state
,
2687 "`in' qualifier in declaration of `%s' "
2688 "only valid for function parameters in %s",
2689 decl
->identifier
, state
->get_version_string());
2691 /* FINISHME: Test for other invalid qualifiers. */
2694 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2695 & loc
, this->ubo_qualifiers_valid
, false);
2697 if (this->type
->qualifier
.flags
.q
.invariant
) {
2698 if ((state
->target
== vertex_shader
) &&
2699 var
->mode
!= ir_var_shader_out
) {
2700 _mesa_glsl_error(& loc
, state
,
2701 "`%s' cannot be marked invariant, vertex shader "
2702 "outputs only", var
->name
);
2703 } else if ((state
->target
== fragment_shader
) &&
2704 var
->mode
!= ir_var_shader_in
) {
2705 /* FINISHME: Note that this doesn't work for invariant on
2706 * a function signature inval
2708 _mesa_glsl_error(& loc
, state
,
2709 "`%s' cannot be marked invariant, fragment shader "
2710 "inputs only", var
->name
);
2714 if (state
->current_function
!= NULL
) {
2715 const char *mode
= NULL
;
2716 const char *extra
= "";
2718 /* There is no need to check for 'inout' here because the parser will
2719 * only allow that in function parameter lists.
2721 if (this->type
->qualifier
.flags
.q
.attribute
) {
2723 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2725 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2727 } else if (this->type
->qualifier
.flags
.q
.in
) {
2729 extra
= " or in function parameter list";
2730 } else if (this->type
->qualifier
.flags
.q
.out
) {
2732 extra
= " or in function parameter list";
2736 _mesa_glsl_error(& loc
, state
,
2737 "%s variable `%s' must be declared at "
2739 mode
, var
->name
, extra
);
2741 } else if (var
->mode
== ir_var_shader_in
) {
2742 var
->read_only
= true;
2744 if (state
->target
== vertex_shader
) {
2745 bool error_emitted
= false;
2747 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2749 * "Vertex shader inputs can only be float, floating-point
2750 * vectors, matrices, signed and unsigned integers and integer
2751 * vectors. Vertex shader inputs can also form arrays of these
2752 * types, but not structures."
2754 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2756 * "Vertex shader inputs can only be float, floating-point
2757 * vectors, matrices, signed and unsigned integers and integer
2758 * vectors. They cannot be arrays or structures."
2760 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2762 * "The attribute qualifier can be used only with float,
2763 * floating-point vectors, and matrices. Attribute variables
2764 * cannot be declared as arrays or structures."
2766 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
2768 * "Vertex shader inputs can only be float, floating-point
2769 * vectors, matrices, signed and unsigned integers and integer
2770 * vectors. Vertex shader inputs cannot be arrays or
2773 const glsl_type
*check_type
= var
->type
->is_array()
2774 ? var
->type
->fields
.array
: var
->type
;
2776 switch (check_type
->base_type
) {
2777 case GLSL_TYPE_FLOAT
:
2779 case GLSL_TYPE_UINT
:
2781 if (state
->is_version(120, 300))
2785 _mesa_glsl_error(& loc
, state
,
2786 "vertex shader input / attribute cannot have "
2788 var
->type
->is_array() ? "array of " : "",
2790 error_emitted
= true;
2793 if (!error_emitted
&& var
->type
->is_array() &&
2794 !state
->check_version(150, 0, &loc
,
2795 "vertex shader input / attribute "
2796 "cannot have array type")) {
2797 error_emitted
= true;
2802 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2803 * so must integer vertex outputs.
2805 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2806 * "Fragment shader inputs that are signed or unsigned integers or
2807 * integer vectors must be qualified with the interpolation qualifier
2810 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2811 * "Fragment shader inputs that are, or contain, signed or unsigned
2812 * integers or integer vectors must be qualified with the
2813 * interpolation qualifier flat."
2815 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2816 * "Vertex shader outputs that are, or contain, signed or unsigned
2817 * integers or integer vectors must be qualified with the
2818 * interpolation qualifier flat."
2820 * Note that prior to GLSL 1.50, this requirement applied to vertex
2821 * outputs rather than fragment inputs. That creates problems in the
2822 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2823 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2824 * apply the restriction to both vertex outputs and fragment inputs.
2826 * Note also that the desktop GLSL specs are missing the text "or
2827 * contain"; this is presumably an oversight, since there is no
2828 * reasonable way to interpolate a fragment shader input that contains
2831 if (state
->is_version(130, 300) &&
2832 var
->type
->contains_integer() &&
2833 var
->interpolation
!= INTERP_QUALIFIER_FLAT
&&
2834 ((state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)
2835 || (state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
2836 && state
->es_shader
))) {
2837 const char *var_type
= (state
->target
== vertex_shader
) ?
2838 "vertex output" : "fragment input";
2839 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
2840 "an integer, then it must be qualified with 'flat'",
2845 /* Interpolation qualifiers cannot be applied to 'centroid' and
2846 * 'centroid varying'.
2848 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2849 * "interpolation qualifiers may only precede the qualifiers in,
2850 * centroid in, out, or centroid out in a declaration. They do not apply
2851 * to the deprecated storage qualifiers varying or centroid varying."
2853 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2855 if (state
->is_version(130, 0)
2856 && this->type
->qualifier
.has_interpolation()
2857 && this->type
->qualifier
.flags
.q
.varying
) {
2859 const char *i
= this->type
->qualifier
.interpolation_string();
2862 if (this->type
->qualifier
.flags
.q
.centroid
)
2863 s
= "centroid varying";
2867 _mesa_glsl_error(&loc
, state
,
2868 "qualifier '%s' cannot be applied to the "
2869 "deprecated storage qualifier '%s'", i
, s
);
2873 /* Interpolation qualifiers can only apply to vertex shader outputs and
2874 * fragment shader inputs.
2876 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2877 * "Outputs from a vertex shader (out) and inputs to a fragment
2878 * shader (in) can be further qualified with one or more of these
2879 * interpolation qualifiers"
2881 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
2882 * "These interpolation qualifiers may only precede the qualifiers
2883 * in, centroid in, out, or centroid out in a declaration. They do
2884 * not apply to inputs into a vertex shader or outputs from a
2887 if (state
->is_version(130, 300)
2888 && this->type
->qualifier
.has_interpolation()) {
2890 const char *i
= this->type
->qualifier
.interpolation_string();
2893 switch (state
->target
) {
2895 if (this->type
->qualifier
.flags
.q
.in
) {
2896 _mesa_glsl_error(&loc
, state
,
2897 "qualifier '%s' cannot be applied to vertex "
2898 "shader inputs", i
);
2901 case fragment_shader
:
2902 if (this->type
->qualifier
.flags
.q
.out
) {
2903 _mesa_glsl_error(&loc
, state
,
2904 "qualifier '%s' cannot be applied to fragment "
2905 "shader outputs", i
);
2914 /* From section 4.3.4 of the GLSL 1.30 spec:
2915 * "It is an error to use centroid in in a vertex shader."
2917 * From section 4.3.4 of the GLSL ES 3.00 spec:
2918 * "It is an error to use centroid in or interpolation qualifiers in
2919 * a vertex shader input."
2921 if (state
->is_version(130, 300)
2922 && this->type
->qualifier
.flags
.q
.centroid
2923 && this->type
->qualifier
.flags
.q
.in
2924 && state
->target
== vertex_shader
) {
2926 _mesa_glsl_error(&loc
, state
,
2927 "'centroid in' cannot be used in a vertex shader");
2931 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2933 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
2934 state
->check_precision_qualifiers_allowed(&loc
);
2938 /* Precision qualifiers only apply to floating point and integer types.
2940 * From section 4.5.2 of the GLSL 1.30 spec:
2941 * "Any floating point or any integer declaration can have the type
2942 * preceded by one of these precision qualifiers [...] Literal
2943 * constants do not have precision qualifiers. Neither do Boolean
2946 * In GLSL ES, sampler types are also allowed.
2948 * From page 87 of the GLSL ES spec:
2949 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2951 if (this->type
->qualifier
.precision
!= ast_precision_none
2952 && !var
->type
->is_float()
2953 && !var
->type
->is_integer()
2954 && !var
->type
->is_record()
2955 && !(var
->type
->is_sampler() && state
->es_shader
)
2956 && !(var
->type
->is_array()
2957 && (var
->type
->fields
.array
->is_float()
2958 || var
->type
->fields
.array
->is_integer()))) {
2960 _mesa_glsl_error(&loc
, state
,
2961 "precision qualifiers apply only to floating point"
2962 "%s types", state
->es_shader
? ", integer, and sampler"
2966 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2968 * "[Sampler types] can only be declared as function
2969 * parameters or uniform variables (see Section 4.3.5
2972 if (var_type
->contains_sampler() &&
2973 !this->type
->qualifier
.flags
.q
.uniform
) {
2974 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2977 /* Process the initializer and add its instructions to a temporary
2978 * list. This list will be added to the instruction stream (below) after
2979 * the declaration is added. This is done because in some cases (such as
2980 * redeclarations) the declaration may not actually be added to the
2981 * instruction stream.
2983 exec_list initializer_instructions
;
2984 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2986 if (decl
->initializer
!= NULL
) {
2987 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2989 &initializer_instructions
, state
);
2992 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2994 * "It is an error to write to a const variable outside of
2995 * its declaration, so they must be initialized when
2998 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2999 _mesa_glsl_error(& loc
, state
,
3000 "const declaration of `%s' must be initialized",
3004 /* If the declaration is not a redeclaration, there are a few additional
3005 * semantic checks that must be applied. In addition, variable that was
3006 * created for the declaration should be added to the IR stream.
3008 if (earlier
== NULL
) {
3009 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3011 * "Identifiers starting with "gl_" are reserved for use by
3012 * OpenGL, and may not be declared in a shader as either a
3013 * variable or a function."
3015 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
3016 _mesa_glsl_error(& loc
, state
,
3017 "identifier `%s' uses reserved `gl_' prefix",
3019 else if (strstr(decl
->identifier
, "__")) {
3020 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3023 * "In addition, all identifiers containing two
3024 * consecutive underscores (__) are reserved as
3025 * possible future keywords."
3027 _mesa_glsl_error(& loc
, state
,
3028 "identifier `%s' uses reserved `__' string",
3032 /* Add the variable to the symbol table. Note that the initializer's
3033 * IR was already processed earlier (though it hasn't been emitted
3034 * yet), without the variable in scope.
3036 * This differs from most C-like languages, but it follows the GLSL
3037 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3040 * "Within a declaration, the scope of a name starts immediately
3041 * after the initializer if present or immediately after the name
3042 * being declared if not."
3044 if (!state
->symbols
->add_variable(var
)) {
3045 YYLTYPE loc
= this->get_location();
3046 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3047 "current scope", decl
->identifier
);
3051 /* Push the variable declaration to the top. It means that all the
3052 * variable declarations will appear in a funny last-to-first order,
3053 * but otherwise we run into trouble if a function is prototyped, a
3054 * global var is decled, then the function is defined with usage of
3055 * the global var. See glslparsertest's CorrectModule.frag.
3057 instructions
->push_head(var
);
3060 instructions
->append_list(&initializer_instructions
);
3064 /* Generally, variable declarations do not have r-values. However,
3065 * one is used for the declaration in
3067 * while (bool b = some_condition()) {
3071 * so we return the rvalue from the last seen declaration here.
3078 ast_parameter_declarator::hir(exec_list
*instructions
,
3079 struct _mesa_glsl_parse_state
*state
)
3082 const struct glsl_type
*type
;
3083 const char *name
= NULL
;
3084 YYLTYPE loc
= this->get_location();
3086 type
= this->type
->specifier
->glsl_type(& name
, state
);
3090 _mesa_glsl_error(& loc
, state
,
3091 "invalid type `%s' in declaration of `%s'",
3092 name
, this->identifier
);
3094 _mesa_glsl_error(& loc
, state
,
3095 "invalid type in declaration of `%s'",
3099 type
= glsl_type::error_type
;
3102 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3104 * "Functions that accept no input arguments need not use void in the
3105 * argument list because prototypes (or definitions) are required and
3106 * therefore there is no ambiguity when an empty argument list "( )" is
3107 * declared. The idiom "(void)" as a parameter list is provided for
3110 * Placing this check here prevents a void parameter being set up
3111 * for a function, which avoids tripping up checks for main taking
3112 * parameters and lookups of an unnamed symbol.
3114 if (type
->is_void()) {
3115 if (this->identifier
!= NULL
)
3116 _mesa_glsl_error(& loc
, state
,
3117 "named parameter cannot have type `void'");
3123 if (formal_parameter
&& (this->identifier
== NULL
)) {
3124 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3128 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3129 * call already handled the "vec4[..] foo" case.
3131 if (this->is_array
) {
3132 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3135 if (!type
->is_error() && type
->array_size() == 0) {
3136 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3138 type
= glsl_type::error_type
;
3142 ir_variable
*var
= new(ctx
)
3143 ir_variable(type
, this->identifier
, ir_var_function_in
);
3145 /* Apply any specified qualifiers to the parameter declaration. Note that
3146 * for function parameters the default mode is 'in'.
3148 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3151 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3153 * "Samplers cannot be treated as l-values; hence cannot be used
3154 * as out or inout function parameters, nor can they be assigned
3157 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3158 && type
->contains_sampler()) {
3159 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3160 type
= glsl_type::error_type
;
3163 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3165 * "When calling a function, expressions that do not evaluate to
3166 * l-values cannot be passed to parameters declared as out or inout."
3168 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3170 * "Other binary or unary expressions, non-dereferenced arrays,
3171 * function names, swizzles with repeated fields, and constants
3172 * cannot be l-values."
3174 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3175 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3177 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3179 && !state
->check_version(120, 100, &loc
,
3180 "arrays cannot be out or inout parameters")) {
3181 type
= glsl_type::error_type
;
3184 instructions
->push_tail(var
);
3186 /* Parameter declarations do not have r-values.
3193 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3195 exec_list
*ir_parameters
,
3196 _mesa_glsl_parse_state
*state
)
3198 ast_parameter_declarator
*void_param
= NULL
;
3201 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3202 param
->formal_parameter
= formal
;
3203 param
->hir(ir_parameters
, state
);
3211 if ((void_param
!= NULL
) && (count
> 1)) {
3212 YYLTYPE loc
= void_param
->get_location();
3214 _mesa_glsl_error(& loc
, state
,
3215 "`void' parameter must be only parameter");
3221 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3223 /* IR invariants disallow function declarations or definitions
3224 * nested within other function definitions. But there is no
3225 * requirement about the relative order of function declarations
3226 * and definitions with respect to one another. So simply insert
3227 * the new ir_function block at the end of the toplevel instruction
3230 state
->toplevel_ir
->push_tail(f
);
3235 ast_function::hir(exec_list
*instructions
,
3236 struct _mesa_glsl_parse_state
*state
)
3239 ir_function
*f
= NULL
;
3240 ir_function_signature
*sig
= NULL
;
3241 exec_list hir_parameters
;
3243 const char *const name
= identifier
;
3245 /* New functions are always added to the top-level IR instruction stream,
3246 * so this instruction list pointer is ignored. See also emit_function
3249 (void) instructions
;
3251 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3253 * "Function declarations (prototypes) cannot occur inside of functions;
3254 * they must be at global scope, or for the built-in functions, outside
3255 * the global scope."
3257 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3259 * "User defined functions may only be defined within the global scope."
3261 * Note that this language does not appear in GLSL 1.10.
3263 if ((state
->current_function
!= NULL
) &&
3264 state
->is_version(120, 100)) {
3265 YYLTYPE loc
= this->get_location();
3266 _mesa_glsl_error(&loc
, state
,
3267 "declaration of function `%s' not allowed within "
3268 "function body", name
);
3271 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3273 * "Identifiers starting with "gl_" are reserved for use by
3274 * OpenGL, and may not be declared in a shader as either a
3275 * variable or a function."
3277 if (strncmp(name
, "gl_", 3) == 0) {
3278 YYLTYPE loc
= this->get_location();
3279 _mesa_glsl_error(&loc
, state
,
3280 "identifier `%s' uses reserved `gl_' prefix", name
);
3283 /* Convert the list of function parameters to HIR now so that they can be
3284 * used below to compare this function's signature with previously seen
3285 * signatures for functions with the same name.
3287 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3289 & hir_parameters
, state
);
3291 const char *return_type_name
;
3292 const glsl_type
*return_type
=
3293 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3296 YYLTYPE loc
= this->get_location();
3297 _mesa_glsl_error(&loc
, state
,
3298 "function `%s' has undeclared return type `%s'",
3299 name
, return_type_name
);
3300 return_type
= glsl_type::error_type
;
3303 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3304 * "No qualifier is allowed on the return type of a function."
3306 if (this->return_type
->has_qualifiers()) {
3307 YYLTYPE loc
= this->get_location();
3308 _mesa_glsl_error(& loc
, state
,
3309 "function `%s' return type has qualifiers", name
);
3312 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3314 * "[Sampler types] can only be declared as function parameters
3315 * or uniform variables (see Section 4.3.5 "Uniform")".
3317 if (return_type
->contains_sampler()) {
3318 YYLTYPE loc
= this->get_location();
3319 _mesa_glsl_error(&loc
, state
,
3320 "function `%s' return type can't contain a sampler",
3324 /* Verify that this function's signature either doesn't match a previously
3325 * seen signature for a function with the same name, or, if a match is found,
3326 * that the previously seen signature does not have an associated definition.
3328 f
= state
->symbols
->get_function(name
);
3329 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3330 sig
= f
->exact_matching_signature(&hir_parameters
);
3332 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3333 if (badvar
!= NULL
) {
3334 YYLTYPE loc
= this->get_location();
3336 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3337 "qualifiers don't match prototype", name
, badvar
);
3340 if (sig
->return_type
!= return_type
) {
3341 YYLTYPE loc
= this->get_location();
3343 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3344 "match prototype", name
);
3347 if (sig
->is_defined
) {
3348 if (is_definition
) {
3349 YYLTYPE loc
= this->get_location();
3350 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3352 /* We just encountered a prototype that exactly matches a
3353 * function that's already been defined. This is redundant,
3354 * and we should ignore it.
3361 f
= new(ctx
) ir_function(name
);
3362 if (!state
->symbols
->add_function(f
)) {
3363 /* This function name shadows a non-function use of the same name. */
3364 YYLTYPE loc
= this->get_location();
3366 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3367 "non-function", name
);
3371 emit_function(state
, f
);
3374 /* Verify the return type of main() */
3375 if (strcmp(name
, "main") == 0) {
3376 if (! return_type
->is_void()) {
3377 YYLTYPE loc
= this->get_location();
3379 _mesa_glsl_error(& loc
, state
, "main() must return void");
3382 if (!hir_parameters
.is_empty()) {
3383 YYLTYPE loc
= this->get_location();
3385 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3389 /* Finish storing the information about this new function in its signature.
3392 sig
= new(ctx
) ir_function_signature(return_type
);
3393 f
->add_signature(sig
);
3396 sig
->replace_parameters(&hir_parameters
);
3399 /* Function declarations (prototypes) do not have r-values.
3406 ast_function_definition::hir(exec_list
*instructions
,
3407 struct _mesa_glsl_parse_state
*state
)
3409 prototype
->is_definition
= true;
3410 prototype
->hir(instructions
, state
);
3412 ir_function_signature
*signature
= prototype
->signature
;
3413 if (signature
== NULL
)
3416 assert(state
->current_function
== NULL
);
3417 state
->current_function
= signature
;
3418 state
->found_return
= false;
3420 /* Duplicate parameters declared in the prototype as concrete variables.
3421 * Add these to the symbol table.
3423 state
->symbols
->push_scope();
3424 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3425 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3427 assert(var
!= NULL
);
3429 /* The only way a parameter would "exist" is if two parameters have
3432 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3433 YYLTYPE loc
= this->get_location();
3435 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3437 state
->symbols
->add_variable(var
);
3441 /* Convert the body of the function to HIR. */
3442 this->body
->hir(&signature
->body
, state
);
3443 signature
->is_defined
= true;
3445 state
->symbols
->pop_scope();
3447 assert(state
->current_function
== signature
);
3448 state
->current_function
= NULL
;
3450 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3451 YYLTYPE loc
= this->get_location();
3452 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3453 "%s, but no return statement",
3454 signature
->function_name(),
3455 signature
->return_type
->name
);
3458 /* Function definitions do not have r-values.
3465 ast_jump_statement::hir(exec_list
*instructions
,
3466 struct _mesa_glsl_parse_state
*state
)
3473 assert(state
->current_function
);
3475 if (opt_return_value
) {
3476 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
3478 /* The value of the return type can be NULL if the shader says
3479 * 'return foo();' and foo() is a function that returns void.
3481 * NOTE: The GLSL spec doesn't say that this is an error. The type
3482 * of the return value is void. If the return type of the function is
3483 * also void, then this should compile without error. Seriously.
3485 const glsl_type
*const ret_type
=
3486 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3488 /* Implicit conversions are not allowed for return values prior to
3489 * ARB_shading_language_420pack.
3491 if (state
->current_function
->return_type
!= ret_type
) {
3492 YYLTYPE loc
= this->get_location();
3494 if (state
->ARB_shading_language_420pack_enable
) {
3495 if (!apply_implicit_conversion(state
->current_function
->return_type
,
3497 _mesa_glsl_error(& loc
, state
,
3498 "could not implicitly convert return value "
3499 "to %s, in function `%s'",
3500 state
->current_function
->return_type
->name
,
3501 state
->current_function
->function_name());
3504 _mesa_glsl_error(& loc
, state
,
3505 "`return' with wrong type %s, in function `%s' "
3508 state
->current_function
->function_name(),
3509 state
->current_function
->return_type
->name
);
3511 } else if (state
->current_function
->return_type
->base_type
==
3513 YYLTYPE loc
= this->get_location();
3515 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
3516 * specs add a clarification:
3518 * "A void function can only use return without a return argument, even if
3519 * the return argument has void type. Return statements only accept values:
3522 * void func2() { return func1(); } // illegal return statement"
3524 _mesa_glsl_error(& loc
, state
,
3525 "void functions can only use `return' without a "
3529 inst
= new(ctx
) ir_return(ret
);
3531 if (state
->current_function
->return_type
->base_type
!=
3533 YYLTYPE loc
= this->get_location();
3535 _mesa_glsl_error(& loc
, state
,
3536 "`return' with no value, in function %s returning "
3538 state
->current_function
->function_name());
3540 inst
= new(ctx
) ir_return
;
3543 state
->found_return
= true;
3544 instructions
->push_tail(inst
);
3549 if (state
->target
!= fragment_shader
) {
3550 YYLTYPE loc
= this->get_location();
3552 _mesa_glsl_error(& loc
, state
,
3553 "`discard' may only appear in a fragment shader");
3555 instructions
->push_tail(new(ctx
) ir_discard
);
3560 if (mode
== ast_continue
&&
3561 state
->loop_nesting_ast
== NULL
) {
3562 YYLTYPE loc
= this->get_location();
3564 _mesa_glsl_error(& loc
, state
,
3565 "continue may only appear in a loop");
3566 } else if (mode
== ast_break
&&
3567 state
->loop_nesting_ast
== NULL
&&
3568 state
->switch_state
.switch_nesting_ast
== NULL
) {
3569 YYLTYPE loc
= this->get_location();
3571 _mesa_glsl_error(& loc
, state
,
3572 "break may only appear in a loop or a switch");
3574 /* For a loop, inline the for loop expression again,
3575 * since we don't know where near the end of
3576 * the loop body the normal copy of it
3577 * is going to be placed.
3579 if (state
->loop_nesting_ast
!= NULL
&&
3580 mode
== ast_continue
&&
3581 state
->loop_nesting_ast
->rest_expression
) {
3582 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3586 if (state
->switch_state
.is_switch_innermost
&&
3587 mode
== ast_break
) {
3588 /* Force break out of switch by setting is_break switch state.
3590 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3591 ir_dereference_variable
*const deref_is_break_var
=
3592 new(ctx
) ir_dereference_variable(is_break_var
);
3593 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3594 ir_assignment
*const set_break_var
=
3595 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3597 instructions
->push_tail(set_break_var
);
3600 ir_loop_jump
*const jump
=
3601 new(ctx
) ir_loop_jump((mode
== ast_break
)
3602 ? ir_loop_jump::jump_break
3603 : ir_loop_jump::jump_continue
);
3604 instructions
->push_tail(jump
);
3611 /* Jump instructions do not have r-values.
3618 ast_selection_statement::hir(exec_list
*instructions
,
3619 struct _mesa_glsl_parse_state
*state
)
3623 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3625 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3627 * "Any expression whose type evaluates to a Boolean can be used as the
3628 * conditional expression bool-expression. Vector types are not accepted
3629 * as the expression to if."
3631 * The checks are separated so that higher quality diagnostics can be
3632 * generated for cases where both rules are violated.
3634 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3635 YYLTYPE loc
= this->condition
->get_location();
3637 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3641 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3643 if (then_statement
!= NULL
) {
3644 state
->symbols
->push_scope();
3645 then_statement
->hir(& stmt
->then_instructions
, state
);
3646 state
->symbols
->pop_scope();
3649 if (else_statement
!= NULL
) {
3650 state
->symbols
->push_scope();
3651 else_statement
->hir(& stmt
->else_instructions
, state
);
3652 state
->symbols
->pop_scope();
3655 instructions
->push_tail(stmt
);
3657 /* if-statements do not have r-values.
3664 ast_switch_statement::hir(exec_list
*instructions
,
3665 struct _mesa_glsl_parse_state
*state
)
3669 ir_rvalue
*const test_expression
=
3670 this->test_expression
->hir(instructions
, state
);
3672 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3674 * "The type of init-expression in a switch statement must be a
3677 if (!test_expression
->type
->is_scalar() ||
3678 !test_expression
->type
->is_integer()) {
3679 YYLTYPE loc
= this->test_expression
->get_location();
3681 _mesa_glsl_error(& loc
,
3683 "switch-statement expression must be scalar "
3687 /* Track the switch-statement nesting in a stack-like manner.
3689 struct glsl_switch_state saved
= state
->switch_state
;
3691 state
->switch_state
.is_switch_innermost
= true;
3692 state
->switch_state
.switch_nesting_ast
= this;
3693 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3694 hash_table_pointer_compare
);
3695 state
->switch_state
.previous_default
= NULL
;
3697 /* Initalize is_fallthru state to false.
3699 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3700 state
->switch_state
.is_fallthru_var
=
3701 new(ctx
) ir_variable(glsl_type::bool_type
,
3702 "switch_is_fallthru_tmp",
3704 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3706 ir_dereference_variable
*deref_is_fallthru_var
=
3707 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3708 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3711 /* Initalize is_break state to false.
3713 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3714 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3715 "switch_is_break_tmp",
3717 instructions
->push_tail(state
->switch_state
.is_break_var
);
3719 ir_dereference_variable
*deref_is_break_var
=
3720 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3721 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3724 /* Cache test expression.
3726 test_to_hir(instructions
, state
);
3728 /* Emit code for body of switch stmt.
3730 body
->hir(instructions
, state
);
3732 hash_table_dtor(state
->switch_state
.labels_ht
);
3734 state
->switch_state
= saved
;
3736 /* Switch statements do not have r-values. */
3742 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3743 struct _mesa_glsl_parse_state
*state
)
3747 /* Cache value of test expression. */
3748 ir_rvalue
*const test_val
=
3749 test_expression
->hir(instructions
,
3752 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3755 ir_dereference_variable
*deref_test_var
=
3756 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3758 instructions
->push_tail(state
->switch_state
.test_var
);
3759 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
3764 ast_switch_body::hir(exec_list
*instructions
,
3765 struct _mesa_glsl_parse_state
*state
)
3768 stmts
->hir(instructions
, state
);
3770 /* Switch bodies do not have r-values. */
3775 ast_case_statement_list::hir(exec_list
*instructions
,
3776 struct _mesa_glsl_parse_state
*state
)
3778 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3779 case_stmt
->hir(instructions
, state
);
3781 /* Case statements do not have r-values. */
3786 ast_case_statement::hir(exec_list
*instructions
,
3787 struct _mesa_glsl_parse_state
*state
)
3789 labels
->hir(instructions
, state
);
3791 /* Conditionally set fallthru state based on break state. */
3792 ir_constant
*const false_val
= new(state
) ir_constant(false);
3793 ir_dereference_variable
*const deref_is_fallthru_var
=
3794 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3795 ir_dereference_variable
*const deref_is_break_var
=
3796 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3797 ir_assignment
*const reset_fallthru_on_break
=
3798 new(state
) ir_assignment(deref_is_fallthru_var
,
3800 deref_is_break_var
);
3801 instructions
->push_tail(reset_fallthru_on_break
);
3803 /* Guard case statements depending on fallthru state. */
3804 ir_dereference_variable
*const deref_fallthru_guard
=
3805 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3806 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3808 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3809 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3811 instructions
->push_tail(test_fallthru
);
3813 /* Case statements do not have r-values. */
3819 ast_case_label_list::hir(exec_list
*instructions
,
3820 struct _mesa_glsl_parse_state
*state
)
3822 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3823 label
->hir(instructions
, state
);
3825 /* Case labels do not have r-values. */
3830 ast_case_label::hir(exec_list
*instructions
,
3831 struct _mesa_glsl_parse_state
*state
)
3835 ir_dereference_variable
*deref_fallthru_var
=
3836 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3838 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3840 /* If not default case, ... */
3841 if (this->test_value
!= NULL
) {
3842 /* Conditionally set fallthru state based on
3843 * comparison of cached test expression value to case label.
3845 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3846 ir_constant
*label_const
= label_rval
->constant_expression_value();
3849 YYLTYPE loc
= this->test_value
->get_location();
3851 _mesa_glsl_error(& loc
, state
,
3852 "switch statement case label must be a "
3853 "constant expression");
3855 /* Stuff a dummy value in to allow processing to continue. */
3856 label_const
= new(ctx
) ir_constant(0);
3858 ast_expression
*previous_label
= (ast_expression
*)
3859 hash_table_find(state
->switch_state
.labels_ht
,
3860 (void *)(uintptr_t)label_const
->value
.u
[0]);
3862 if (previous_label
) {
3863 YYLTYPE loc
= this->test_value
->get_location();
3864 _mesa_glsl_error(& loc
, state
,
3865 "duplicate case value");
3867 loc
= previous_label
->get_location();
3868 _mesa_glsl_error(& loc
, state
,
3869 "this is the previous case label");
3871 hash_table_insert(state
->switch_state
.labels_ht
,
3873 (void *)(uintptr_t)label_const
->value
.u
[0]);
3877 ir_dereference_variable
*deref_test_var
=
3878 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3880 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3884 ir_assignment
*set_fallthru_on_test
=
3885 new(ctx
) ir_assignment(deref_fallthru_var
,
3889 instructions
->push_tail(set_fallthru_on_test
);
3890 } else { /* default case */
3891 if (state
->switch_state
.previous_default
) {
3892 YYLTYPE loc
= this->get_location();
3893 _mesa_glsl_error(& loc
, state
,
3894 "multiple default labels in one switch");
3896 loc
= state
->switch_state
.previous_default
->get_location();
3897 _mesa_glsl_error(& loc
, state
,
3898 "this is the first default label");
3900 state
->switch_state
.previous_default
= this;
3902 /* Set falltrhu state. */
3903 ir_assignment
*set_fallthru
=
3904 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
3906 instructions
->push_tail(set_fallthru
);
3909 /* Case statements do not have r-values. */
3914 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3915 struct _mesa_glsl_parse_state
*state
)
3919 if (condition
!= NULL
) {
3920 ir_rvalue
*const cond
=
3921 condition
->hir(& stmt
->body_instructions
, state
);
3924 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3925 YYLTYPE loc
= condition
->get_location();
3927 _mesa_glsl_error(& loc
, state
,
3928 "loop condition must be scalar boolean");
3930 /* As the first code in the loop body, generate a block that looks
3931 * like 'if (!condition) break;' as the loop termination condition.
3933 ir_rvalue
*const not_cond
=
3934 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
3936 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3938 ir_jump
*const break_stmt
=
3939 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3941 if_stmt
->then_instructions
.push_tail(break_stmt
);
3942 stmt
->body_instructions
.push_tail(if_stmt
);
3949 ast_iteration_statement::hir(exec_list
*instructions
,
3950 struct _mesa_glsl_parse_state
*state
)
3954 /* For-loops and while-loops start a new scope, but do-while loops do not.
3956 if (mode
!= ast_do_while
)
3957 state
->symbols
->push_scope();
3959 if (init_statement
!= NULL
)
3960 init_statement
->hir(instructions
, state
);
3962 ir_loop
*const stmt
= new(ctx
) ir_loop();
3963 instructions
->push_tail(stmt
);
3965 /* Track the current loop nesting. */
3966 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3968 state
->loop_nesting_ast
= this;
3970 /* Likewise, indicate that following code is closest to a loop,
3971 * NOT closest to a switch.
3973 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3974 state
->switch_state
.is_switch_innermost
= false;
3976 if (mode
!= ast_do_while
)
3977 condition_to_hir(stmt
, state
);
3980 body
->hir(& stmt
->body_instructions
, state
);
3982 if (rest_expression
!= NULL
)
3983 rest_expression
->hir(& stmt
->body_instructions
, state
);
3985 if (mode
== ast_do_while
)
3986 condition_to_hir(stmt
, state
);
3988 if (mode
!= ast_do_while
)
3989 state
->symbols
->pop_scope();
3991 /* Restore previous nesting before returning. */
3992 state
->loop_nesting_ast
= nesting_ast
;
3993 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3995 /* Loops do not have r-values.
4002 * Determine if the given type is valid for establishing a default precision
4005 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4007 * "The precision statement
4009 * precision precision-qualifier type;
4011 * can be used to establish a default precision qualifier. The type field
4012 * can be either int or float or any of the sampler types, and the
4013 * precision-qualifier can be lowp, mediump, or highp."
4015 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4016 * qualifiers on sampler types, but this seems like an oversight (since the
4017 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4018 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4022 is_valid_default_precision_type(const struct _mesa_glsl_parse_state
*state
,
4023 const char *type_name
)
4025 const struct glsl_type
*type
= state
->symbols
->get_type(type_name
);
4029 switch (type
->base_type
) {
4031 case GLSL_TYPE_FLOAT
:
4032 /* "int" and "float" are valid, but vectors and matrices are not. */
4033 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4034 case GLSL_TYPE_SAMPLER
:
4043 ast_type_specifier::hir(exec_list
*instructions
,
4044 struct _mesa_glsl_parse_state
*state
)
4046 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
4049 YYLTYPE loc
= this->get_location();
4051 /* If this is a precision statement, check that the type to which it is
4052 * applied is either float or int.
4054 * From section 4.5.3 of the GLSL 1.30 spec:
4055 * "The precision statement
4056 * precision precision-qualifier type;
4057 * can be used to establish a default precision qualifier. The type
4058 * field can be either int or float [...]. Any other types or
4059 * qualifiers will result in an error.
4061 if (this->default_precision
!= ast_precision_none
) {
4062 if (!state
->check_precision_qualifiers_allowed(&loc
))
4065 if (this->structure
!= NULL
) {
4066 _mesa_glsl_error(&loc
, state
,
4067 "precision qualifiers do not apply to structures");
4071 if (this->is_array
) {
4072 _mesa_glsl_error(&loc
, state
,
4073 "default precision statements do not apply to "
4077 if (!is_valid_default_precision_type(state
, this->type_name
)) {
4078 _mesa_glsl_error(&loc
, state
,
4079 "default precision statements apply only to types "
4080 "float, int, and sampler types");
4084 /* FINISHME: Translate precision statements into IR. */
4088 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
4089 * process_record_constructor() can do type-checking on C-style initializer
4090 * expressions of structs, but ast_struct_specifier should only be translated
4091 * to HIR if it is declaring the type of a structure.
4093 * The ->is_declaration field is false for initializers of variables
4094 * declared separately from the struct's type definition.
4096 * struct S { ... }; (is_declaration = true)
4097 * struct T { ... } t = { ... }; (is_declaration = true)
4098 * S s = { ... }; (is_declaration = false)
4100 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
4101 return this->structure
->hir(instructions
, state
);
4108 * Process a structure or interface block tree into an array of structure fields
4110 * After parsing, where there are some syntax differnces, structures and
4111 * interface blocks are almost identical. They are similar enough that the
4112 * AST for each can be processed the same way into a set of
4113 * \c glsl_struct_field to describe the members.
4116 * The number of fields processed. A pointer to the array structure fields is
4117 * stored in \c *fields_ret.
4120 ast_process_structure_or_interface_block(exec_list
*instructions
,
4121 struct _mesa_glsl_parse_state
*state
,
4122 exec_list
*declarations
,
4124 glsl_struct_field
**fields_ret
,
4126 bool block_row_major
)
4128 unsigned decl_count
= 0;
4130 /* Make an initial pass over the list of fields to determine how
4131 * many there are. Each element in this list is an ast_declarator_list.
4132 * This means that we actually need to count the number of elements in the
4133 * 'declarations' list in each of the elements.
4135 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4136 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4141 /* Allocate storage for the fields and process the field
4142 * declarations. As the declarations are processed, try to also convert
4143 * the types to HIR. This ensures that structure definitions embedded in
4144 * other structure definitions or in interface blocks are processed.
4146 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4150 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4151 const char *type_name
;
4153 decl_list
->type
->specifier
->hir(instructions
, state
);
4155 /* Section 10.9 of the GLSL ES 1.00 specification states that
4156 * embedded structure definitions have been removed from the language.
4158 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4159 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
4160 "not allowed in GLSL ES 1.00");
4163 const glsl_type
*decl_type
=
4164 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
4166 foreach_list_typed (ast_declaration
, decl
, link
,
4167 &decl_list
->declarations
) {
4168 /* From the GL_ARB_uniform_buffer_object spec:
4170 * "Sampler types are not allowed inside of uniform
4171 * blocks. All other types, arrays, and structures
4172 * allowed for uniforms are allowed within a uniform
4175 * It should be impossible for decl_type to be NULL here. Cases that
4176 * might naturally lead to decl_type being NULL, especially for the
4177 * is_interface case, will have resulted in compilation having
4178 * already halted due to a syntax error.
4180 const struct glsl_type
*field_type
=
4181 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4183 if (is_interface
&& field_type
->contains_sampler()) {
4184 YYLTYPE loc
= decl_list
->get_location();
4185 _mesa_glsl_error(&loc
, state
,
4186 "uniform in non-default uniform block contains sampler");
4189 const struct ast_type_qualifier
*const qual
=
4190 & decl_list
->type
->qualifier
;
4191 if (qual
->flags
.q
.std140
||
4192 qual
->flags
.q
.packed
||
4193 qual
->flags
.q
.shared
) {
4194 _mesa_glsl_error(&loc
, state
,
4195 "uniform block layout qualifiers std140, packed, and "
4196 "shared can only be applied to uniform blocks, not "
4200 if (decl
->is_array
) {
4201 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4204 fields
[i
].type
= field_type
;
4205 fields
[i
].name
= decl
->identifier
;
4207 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4208 if (!qual
->flags
.q
.uniform
) {
4209 _mesa_glsl_error(&loc
, state
,
4210 "row_major and column_major can only be "
4211 "applied to uniform interface blocks");
4212 } else if (!field_type
->is_matrix() && !field_type
->is_record()) {
4213 _mesa_glsl_error(&loc
, state
,
4214 "uniform block layout qualifiers row_major and "
4215 "column_major can only be applied to matrix and "
4218 validate_matrix_layout_for_type(state
, &loc
, field_type
);
4221 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
4222 _mesa_glsl_error(&loc
, state
,
4223 "interpolation qualifiers cannot be used "
4224 "with uniform interface blocks");
4227 if (field_type
->is_matrix() ||
4228 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4229 fields
[i
].row_major
= block_row_major
;
4230 if (qual
->flags
.q
.row_major
)
4231 fields
[i
].row_major
= true;
4232 else if (qual
->flags
.q
.column_major
)
4233 fields
[i
].row_major
= false;
4240 assert(i
== decl_count
);
4242 *fields_ret
= fields
;
4248 ast_struct_specifier::hir(exec_list
*instructions
,
4249 struct _mesa_glsl_parse_state
*state
)
4251 YYLTYPE loc
= this->get_location();
4252 glsl_struct_field
*fields
;
4253 unsigned decl_count
=
4254 ast_process_structure_or_interface_block(instructions
,
4256 &this->declarations
,
4262 const glsl_type
*t
=
4263 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4265 if (!state
->symbols
->add_type(name
, t
)) {
4266 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4268 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4270 state
->num_user_structures
+ 1);
4272 s
[state
->num_user_structures
] = t
;
4273 state
->user_structures
= s
;
4274 state
->num_user_structures
++;
4278 /* Structure type definitions do not have r-values.
4284 ast_interface_block::hir(exec_list
*instructions
,
4285 struct _mesa_glsl_parse_state
*state
)
4287 YYLTYPE loc
= this->get_location();
4289 /* The ast_interface_block has a list of ast_declarator_lists. We
4290 * need to turn those into ir_variables with an association
4291 * with this uniform block.
4293 enum glsl_interface_packing packing
;
4294 if (this->layout
.flags
.q
.shared
) {
4295 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4296 } else if (this->layout
.flags
.q
.packed
) {
4297 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4299 /* The default layout is std140.
4301 packing
= GLSL_INTERFACE_PACKING_STD140
;
4304 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4305 exec_list declared_variables
;
4306 glsl_struct_field
*fields
;
4307 unsigned int num_variables
=
4308 ast_process_structure_or_interface_block(&declared_variables
,
4310 &this->declarations
,
4316 ir_variable_mode var_mode
;
4317 const char *iface_type_name
;
4318 if (this->layout
.flags
.q
.in
) {
4319 var_mode
= ir_var_shader_in
;
4320 iface_type_name
= "in";
4321 } else if (this->layout
.flags
.q
.out
) {
4322 var_mode
= ir_var_shader_out
;
4323 iface_type_name
= "out";
4324 } else if (this->layout
.flags
.q
.uniform
) {
4325 var_mode
= ir_var_uniform
;
4326 iface_type_name
= "uniform";
4328 var_mode
= ir_var_auto
;
4329 iface_type_name
= "UNKNOWN";
4330 assert(!"interface block layout qualifier not found!");
4333 const glsl_type
*block_type
=
4334 glsl_type::get_interface_instance(fields
,
4339 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
4340 YYLTYPE loc
= this->get_location();
4341 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
4342 "already taken in the current scope",
4343 this->block_name
, iface_type_name
);
4346 /* Since interface blocks cannot contain statements, it should be
4347 * impossible for the block to generate any instructions.
4349 assert(declared_variables
.is_empty());
4351 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4354 * "If an instance name (instance-name) is used, then it puts all the
4355 * members inside a scope within its own name space, accessed with the
4356 * field selector ( . ) operator (analogously to structures)."
4358 if (this->instance_name
) {
4361 if (this->array_size
!= NULL
) {
4362 const glsl_type
*block_array_type
=
4363 process_array_type(&loc
, block_type
, this->array_size
, state
);
4365 var
= new(state
) ir_variable(block_array_type
,
4366 this->instance_name
,
4369 var
= new(state
) ir_variable(block_type
,
4370 this->instance_name
,
4374 var
->interface_type
= block_type
;
4375 state
->symbols
->add_variable(var
);
4376 instructions
->push_tail(var
);
4378 /* In order to have an array size, the block must also be declared with
4381 assert(this->array_size
== NULL
);
4383 for (unsigned i
= 0; i
< num_variables
; i
++) {
4385 new(state
) ir_variable(fields
[i
].type
,
4386 ralloc_strdup(state
, fields
[i
].name
),
4388 var
->interface_type
= block_type
;
4390 /* Propagate the "binding" keyword into this UBO's fields;
4391 * the UBO declaration itself doesn't get an ir_variable unless it
4392 * has an instance name. This is ugly.
4394 var
->explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
4395 var
->binding
= this->layout
.binding
;
4397 state
->symbols
->add_variable(var
);
4398 instructions
->push_tail(var
);
4406 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
4407 exec_list
*instructions
)
4409 bool gl_FragColor_assigned
= false;
4410 bool gl_FragData_assigned
= false;
4411 bool user_defined_fs_output_assigned
= false;
4412 ir_variable
*user_defined_fs_output
= NULL
;
4414 /* It would be nice to have proper location information. */
4416 memset(&loc
, 0, sizeof(loc
));
4418 foreach_list(node
, instructions
) {
4419 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4421 if (!var
|| !var
->assigned
)
4424 if (strcmp(var
->name
, "gl_FragColor") == 0)
4425 gl_FragColor_assigned
= true;
4426 else if (strcmp(var
->name
, "gl_FragData") == 0)
4427 gl_FragData_assigned
= true;
4428 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4429 if (state
->target
== fragment_shader
&&
4430 var
->mode
== ir_var_shader_out
) {
4431 user_defined_fs_output_assigned
= true;
4432 user_defined_fs_output
= var
;
4437 /* From the GLSL 1.30 spec:
4439 * "If a shader statically assigns a value to gl_FragColor, it
4440 * may not assign a value to any element of gl_FragData. If a
4441 * shader statically writes a value to any element of
4442 * gl_FragData, it may not assign a value to
4443 * gl_FragColor. That is, a shader may assign values to either
4444 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4445 * linked together must also consistently write just one of
4446 * these variables. Similarly, if user declared output
4447 * variables are in use (statically assigned to), then the
4448 * built-in variables gl_FragColor and gl_FragData may not be
4449 * assigned to. These incorrect usages all generate compile
4452 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
4453 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4454 "`gl_FragColor' and `gl_FragData'");
4455 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
4456 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4457 "`gl_FragColor' and `%s'",
4458 user_defined_fs_output
->name
);
4459 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
4460 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4461 "`gl_FragData' and `%s'",
4462 user_defined_fs_output
->name
);