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
);
64 remove_per_vertex_blocks(exec_list
*instructions
,
65 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
69 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
71 _mesa_glsl_initialize_variables(instructions
, state
);
73 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
75 state
->current_function
= NULL
;
77 state
->toplevel_ir
= instructions
;
79 state
->gs_input_prim_type_specified
= false;
80 state
->cs_input_local_size_specified
= false;
82 /* Section 4.2 of the GLSL 1.20 specification states:
83 * "The built-in functions are scoped in a scope outside the global scope
84 * users declare global variables in. That is, a shader's global scope,
85 * available for user-defined functions and global variables, is nested
86 * inside the scope containing the built-in functions."
88 * Since built-in functions like ftransform() access built-in variables,
89 * it follows that those must be in the outer scope as well.
91 * We push scope here to create this nesting effect...but don't pop.
92 * This way, a shader's globals are still in the symbol table for use
95 state
->symbols
->push_scope();
97 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
98 ast
->hir(instructions
, state
);
100 detect_recursion_unlinked(state
, instructions
);
101 detect_conflicting_assignments(state
, instructions
);
103 state
->toplevel_ir
= NULL
;
105 /* Move all of the variable declarations to the front of the IR list, and
106 * reverse the order. This has the (intended!) side effect that vertex
107 * shader inputs and fragment shader outputs will appear in the IR in the
108 * same order that they appeared in the shader code. This results in the
109 * locations being assigned in the declared order. Many (arguably buggy)
110 * applications depend on this behavior, and it matches what nearly all
113 foreach_list_safe(node
, instructions
) {
114 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
120 instructions
->push_head(var
);
123 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
125 * If multiple shaders using members of a built-in block belonging to
126 * the same interface are linked together in the same program, they
127 * must all redeclare the built-in block in the same way, as described
128 * in section 4.3.7 "Interface Blocks" for interface block matching, or
129 * a link error will result.
131 * The phrase "using members of a built-in block" implies that if two
132 * shaders are linked together and one of them *does not use* any members
133 * of the built-in block, then that shader does not need to have a matching
134 * redeclaration of the built-in block.
136 * This appears to be a clarification to the behaviour established for
137 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
140 * The definition of "interface" in section 4.3.7 that applies here is as
143 * The boundary between adjacent programmable pipeline stages: This
144 * spans all the outputs in all compilation units of the first stage
145 * and all the inputs in all compilation units of the second stage.
147 * Therefore this rule applies to both inter- and intra-stage linking.
149 * The easiest way to implement this is to check whether the shader uses
150 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
151 * remove all the relevant variable declaration from the IR, so that the
152 * linker won't see them and complain about mismatches.
154 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
155 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
160 * If a conversion is available, convert one operand to a different type
162 * The \c from \c ir_rvalue is converted "in place".
164 * \param to Type that the operand it to be converted to
165 * \param from Operand that is being converted
166 * \param state GLSL compiler state
169 * If a conversion is possible (or unnecessary), \c true is returned.
170 * Otherwise \c false is returned.
173 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
174 struct _mesa_glsl_parse_state
*state
)
177 if (to
->base_type
== from
->type
->base_type
)
180 /* This conversion was added in GLSL 1.20. If the compilation mode is
181 * GLSL 1.10, the conversion is skipped.
183 if (!state
->is_version(120, 0))
186 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
188 * "There are no implicit array or structure conversions. For
189 * example, an array of int cannot be implicitly converted to an
190 * array of float. There are no implicit conversions between
191 * signed and unsigned integers."
193 /* FINISHME: The above comment is partially a lie. There is int/uint
194 * FINISHME: conversion for immediate constants.
196 if (!to
->is_float() || !from
->type
->is_numeric())
199 /* Convert to a floating point type with the same number of components
200 * as the original type - i.e. int to float, not int to vec4.
202 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
203 from
->type
->matrix_columns
);
205 switch (from
->type
->base_type
) {
207 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
210 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
213 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
223 static const struct glsl_type
*
224 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
226 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
228 const glsl_type
*type_a
= value_a
->type
;
229 const glsl_type
*type_b
= value_b
->type
;
231 /* From GLSL 1.50 spec, page 56:
233 * "The arithmetic binary operators add (+), subtract (-),
234 * multiply (*), and divide (/) operate on integer and
235 * floating-point scalars, vectors, and matrices."
237 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
238 _mesa_glsl_error(loc
, state
,
239 "operands to arithmetic operators must be numeric");
240 return glsl_type::error_type
;
244 /* "If one operand is floating-point based and the other is
245 * not, then the conversions from Section 4.1.10 "Implicit
246 * Conversions" are applied to the non-floating-point-based operand."
248 if (!apply_implicit_conversion(type_a
, value_b
, state
)
249 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
250 _mesa_glsl_error(loc
, state
,
251 "could not implicitly convert operands to "
252 "arithmetic operator");
253 return glsl_type::error_type
;
255 type_a
= value_a
->type
;
256 type_b
= value_b
->type
;
258 /* "If the operands are integer types, they must both be signed or
261 * From this rule and the preceeding conversion it can be inferred that
262 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
263 * The is_numeric check above already filtered out the case where either
264 * type is not one of these, so now the base types need only be tested for
267 if (type_a
->base_type
!= type_b
->base_type
) {
268 _mesa_glsl_error(loc
, state
,
269 "base type mismatch for arithmetic operator");
270 return glsl_type::error_type
;
273 /* "All arithmetic binary operators result in the same fundamental type
274 * (signed integer, unsigned integer, or floating-point) as the
275 * operands they operate on, after operand type conversion. After
276 * conversion, the following cases are valid
278 * * The two operands are scalars. In this case the operation is
279 * applied, resulting in a scalar."
281 if (type_a
->is_scalar() && type_b
->is_scalar())
284 /* "* One operand is a scalar, and the other is a vector or matrix.
285 * In this case, the scalar operation is applied independently to each
286 * component of the vector or matrix, resulting in the same size
289 if (type_a
->is_scalar()) {
290 if (!type_b
->is_scalar())
292 } else if (type_b
->is_scalar()) {
296 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
297 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
300 assert(!type_a
->is_scalar());
301 assert(!type_b
->is_scalar());
303 /* "* The two operands are vectors of the same size. In this case, the
304 * operation is done component-wise resulting in the same size
307 if (type_a
->is_vector() && type_b
->is_vector()) {
308 if (type_a
== type_b
) {
311 _mesa_glsl_error(loc
, state
,
312 "vector size mismatch for arithmetic operator");
313 return glsl_type::error_type
;
317 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
318 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
319 * <vector, vector> have been handled. At least one of the operands must
320 * be matrix. Further, since there are no integer matrix types, the base
321 * type of both operands must be float.
323 assert(type_a
->is_matrix() || type_b
->is_matrix());
324 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
325 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
327 /* "* The operator is add (+), subtract (-), or divide (/), and the
328 * operands are matrices with the same number of rows and the same
329 * number of columns. In this case, the operation is done component-
330 * wise resulting in the same size matrix."
331 * * The operator is multiply (*), where both operands are matrices or
332 * one operand is a vector and the other a matrix. A right vector
333 * operand is treated as a column vector and a left vector operand as a
334 * row vector. In all these cases, it is required that the number of
335 * columns of the left operand is equal to the number of rows of the
336 * right operand. Then, the multiply (*) operation does a linear
337 * algebraic multiply, yielding an object that has the same number of
338 * rows as the left operand and the same number of columns as the right
339 * operand. Section 5.10 "Vector and Matrix Operations" explains in
340 * more detail how vectors and matrices are operated on."
343 if (type_a
== type_b
)
346 if (type_a
->is_matrix() && type_b
->is_matrix()) {
347 /* Matrix multiply. The columns of A must match the rows of B. Given
348 * the other previously tested constraints, this means the vector type
349 * of a row from A must be the same as the vector type of a column from
352 if (type_a
->row_type() == type_b
->column_type()) {
353 /* The resulting matrix has the number of columns of matrix B and
354 * the number of rows of matrix A. We get the row count of A by
355 * looking at the size of a vector that makes up a column. The
356 * transpose (size of a row) is done for B.
358 const glsl_type
*const type
=
359 glsl_type::get_instance(type_a
->base_type
,
360 type_a
->column_type()->vector_elements
,
361 type_b
->row_type()->vector_elements
);
362 assert(type
!= glsl_type::error_type
);
366 } else if (type_a
->is_matrix()) {
367 /* A is a matrix and B is a column vector. Columns of A must match
368 * rows of B. Given the other previously tested constraints, this
369 * means the vector type of a row from A must be the same as the
370 * vector the type of B.
372 if (type_a
->row_type() == type_b
) {
373 /* The resulting vector has a number of elements equal to
374 * the number of rows of matrix A. */
375 const glsl_type
*const type
=
376 glsl_type::get_instance(type_a
->base_type
,
377 type_a
->column_type()->vector_elements
,
379 assert(type
!= glsl_type::error_type
);
384 assert(type_b
->is_matrix());
386 /* A is a row vector and B is a matrix. Columns of A must match rows
387 * of B. Given the other previously tested constraints, this means
388 * the type of A must be the same as the vector type of a column from
391 if (type_a
== type_b
->column_type()) {
392 /* The resulting vector has a number of elements equal to
393 * the number of columns of matrix B. */
394 const glsl_type
*const type
=
395 glsl_type::get_instance(type_a
->base_type
,
396 type_b
->row_type()->vector_elements
,
398 assert(type
!= glsl_type::error_type
);
404 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
405 return glsl_type::error_type
;
409 /* "All other cases are illegal."
411 _mesa_glsl_error(loc
, state
, "type mismatch");
412 return glsl_type::error_type
;
416 static const struct glsl_type
*
417 unary_arithmetic_result_type(const struct glsl_type
*type
,
418 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
420 /* From GLSL 1.50 spec, page 57:
422 * "The arithmetic unary operators negate (-), post- and pre-increment
423 * and decrement (-- and ++) operate on integer or floating-point
424 * values (including vectors and matrices). All unary operators work
425 * component-wise on their operands. These result with the same type
428 if (!type
->is_numeric()) {
429 _mesa_glsl_error(loc
, state
,
430 "operands to arithmetic operators must be numeric");
431 return glsl_type::error_type
;
438 * \brief Return the result type of a bit-logic operation.
440 * If the given types to the bit-logic operator are invalid, return
441 * glsl_type::error_type.
443 * \param type_a Type of LHS of bit-logic op
444 * \param type_b Type of RHS of bit-logic op
446 static const struct glsl_type
*
447 bit_logic_result_type(const struct glsl_type
*type_a
,
448 const struct glsl_type
*type_b
,
450 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
452 if (!state
->check_bitwise_operations_allowed(loc
)) {
453 return glsl_type::error_type
;
456 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
458 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
459 * (|). The operands must be of type signed or unsigned integers or
462 if (!type_a
->is_integer()) {
463 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
464 ast_expression::operator_string(op
));
465 return glsl_type::error_type
;
467 if (!type_b
->is_integer()) {
468 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
469 ast_expression::operator_string(op
));
470 return glsl_type::error_type
;
473 /* "The fundamental types of the operands (signed or unsigned) must
476 if (type_a
->base_type
!= type_b
->base_type
) {
477 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
478 "base type", ast_expression::operator_string(op
));
479 return glsl_type::error_type
;
482 /* "The operands cannot be vectors of differing size." */
483 if (type_a
->is_vector() &&
484 type_b
->is_vector() &&
485 type_a
->vector_elements
!= type_b
->vector_elements
) {
486 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
487 "different sizes", ast_expression::operator_string(op
));
488 return glsl_type::error_type
;
491 /* "If one operand is a scalar and the other a vector, the scalar is
492 * applied component-wise to the vector, resulting in the same type as
493 * the vector. The fundamental types of the operands [...] will be the
494 * resulting fundamental type."
496 if (type_a
->is_scalar())
502 static const struct glsl_type
*
503 modulus_result_type(const struct glsl_type
*type_a
,
504 const struct glsl_type
*type_b
,
505 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
507 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
508 return glsl_type::error_type
;
511 /* From GLSL 1.50 spec, page 56:
512 * "The operator modulus (%) operates on signed or unsigned integers or
513 * integer vectors. The operand types must both be signed or both be
516 if (!type_a
->is_integer()) {
517 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
518 return glsl_type::error_type
;
520 if (!type_b
->is_integer()) {
521 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
522 return glsl_type::error_type
;
524 if (type_a
->base_type
!= type_b
->base_type
) {
525 _mesa_glsl_error(loc
, state
,
526 "operands of %% must have the same base type");
527 return glsl_type::error_type
;
530 /* "The operands cannot be vectors of differing size. If one operand is
531 * a scalar and the other vector, then the scalar is applied component-
532 * wise to the vector, resulting in the same type as the vector. If both
533 * are vectors of the same size, the result is computed component-wise."
535 if (type_a
->is_vector()) {
536 if (!type_b
->is_vector()
537 || (type_a
->vector_elements
== type_b
->vector_elements
))
542 /* "The operator modulus (%) is not defined for any other data types
543 * (non-integer types)."
545 _mesa_glsl_error(loc
, state
, "type mismatch");
546 return glsl_type::error_type
;
550 static const struct glsl_type
*
551 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
552 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
554 const glsl_type
*type_a
= value_a
->type
;
555 const glsl_type
*type_b
= value_b
->type
;
557 /* From GLSL 1.50 spec, page 56:
558 * "The relational operators greater than (>), less than (<), greater
559 * than or equal (>=), and less than or equal (<=) operate only on
560 * scalar integer and scalar floating-point expressions."
562 if (!type_a
->is_numeric()
563 || !type_b
->is_numeric()
564 || !type_a
->is_scalar()
565 || !type_b
->is_scalar()) {
566 _mesa_glsl_error(loc
, state
,
567 "operands to relational operators must be scalar and "
569 return glsl_type::error_type
;
572 /* "Either the operands' types must match, or the conversions from
573 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
574 * operand, after which the types must match."
576 if (!apply_implicit_conversion(type_a
, value_b
, state
)
577 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
578 _mesa_glsl_error(loc
, state
,
579 "could not implicitly convert operands to "
580 "relational operator");
581 return glsl_type::error_type
;
583 type_a
= value_a
->type
;
584 type_b
= value_b
->type
;
586 if (type_a
->base_type
!= type_b
->base_type
) {
587 _mesa_glsl_error(loc
, state
, "base type mismatch");
588 return glsl_type::error_type
;
591 /* "The result is scalar Boolean."
593 return glsl_type::bool_type
;
597 * \brief Return the result type of a bit-shift operation.
599 * If the given types to the bit-shift operator are invalid, return
600 * glsl_type::error_type.
602 * \param type_a Type of LHS of bit-shift op
603 * \param type_b Type of RHS of bit-shift op
605 static const struct glsl_type
*
606 shift_result_type(const struct glsl_type
*type_a
,
607 const struct glsl_type
*type_b
,
609 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
611 if (!state
->check_bitwise_operations_allowed(loc
)) {
612 return glsl_type::error_type
;
615 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
617 * "The shift operators (<<) and (>>). For both operators, the operands
618 * must be signed or unsigned integers or integer vectors. One operand
619 * can be signed while the other is unsigned."
621 if (!type_a
->is_integer()) {
622 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
623 "integer vector", ast_expression::operator_string(op
));
624 return glsl_type::error_type
;
627 if (!type_b
->is_integer()) {
628 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
629 "integer vector", ast_expression::operator_string(op
));
630 return glsl_type::error_type
;
633 /* "If the first operand is a scalar, the second operand has to be
636 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
637 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
638 "second must be scalar as well",
639 ast_expression::operator_string(op
));
640 return glsl_type::error_type
;
643 /* If both operands are vectors, check that they have same number of
646 if (type_a
->is_vector() &&
647 type_b
->is_vector() &&
648 type_a
->vector_elements
!= type_b
->vector_elements
) {
649 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
650 "have same number of elements",
651 ast_expression::operator_string(op
));
652 return glsl_type::error_type
;
655 /* "In all cases, the resulting type will be the same type as the left
662 * Validates that a value can be assigned to a location with a specified type
664 * Validates that \c rhs can be assigned to some location. If the types are
665 * not an exact match but an automatic conversion is possible, \c rhs will be
669 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
670 * Otherwise the actual RHS to be assigned will be returned. This may be
671 * \c rhs, or it may be \c rhs after some type conversion.
674 * In addition to being used for assignments, this function is used to
675 * type-check return values.
678 validate_assignment(struct _mesa_glsl_parse_state
*state
,
679 YYLTYPE loc
, const glsl_type
*lhs_type
,
680 ir_rvalue
*rhs
, bool is_initializer
)
682 /* If there is already some error in the RHS, just return it. Anything
683 * else will lead to an avalanche of error message back to the user.
685 if (rhs
->type
->is_error())
688 /* If the types are identical, the assignment can trivially proceed.
690 if (rhs
->type
== lhs_type
)
693 /* If the array element types are the same and the LHS is unsized,
694 * the assignment is okay for initializers embedded in variable
697 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
698 * is handled by ir_dereference::is_lvalue.
700 if (lhs_type
->is_unsized_array() && rhs
->type
->is_array()
701 && (lhs_type
->element_type() == rhs
->type
->element_type())) {
702 if (is_initializer
) {
705 _mesa_glsl_error(&loc
, state
,
706 "implicitly sized arrays cannot be assigned");
711 /* Check for implicit conversion in GLSL 1.20 */
712 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
713 if (rhs
->type
== lhs_type
)
717 _mesa_glsl_error(&loc
, state
,
718 "%s of type %s cannot be assigned to "
719 "variable of type %s",
720 is_initializer
? "initializer" : "value",
721 rhs
->type
->name
, lhs_type
->name
);
727 mark_whole_array_access(ir_rvalue
*access
)
729 ir_dereference_variable
*deref
= access
->as_dereference_variable();
731 if (deref
&& deref
->var
) {
732 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
737 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
738 const char *non_lvalue_description
,
739 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
743 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
744 ir_rvalue
*extract_channel
= NULL
;
746 /* If the assignment LHS comes back as an ir_binop_vector_extract
747 * expression, move it to the RHS as an ir_triop_vector_insert.
749 if (lhs
->ir_type
== ir_type_expression
) {
750 ir_expression
*const lhs_expr
= lhs
->as_expression();
752 if (unlikely(lhs_expr
->operation
== ir_binop_vector_extract
)) {
754 validate_assignment(state
, lhs_loc
, lhs
->type
,
755 rhs
, is_initializer
);
757 if (new_rhs
== NULL
) {
761 * - LHS: (expression float vector_extract <vec> <channel>)
765 * - RHS: (expression vec2 vector_insert <vec> <channel> <scalar>)
767 * The LHS type is now a vector instead of a scalar. Since GLSL
768 * allows assignments to be used as rvalues, we need to re-extract
769 * the channel from assignment_temp when returning the rvalue.
771 extract_channel
= lhs_expr
->operands
[1];
772 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
773 lhs_expr
->operands
[0]->type
,
774 lhs_expr
->operands
[0],
777 lhs
= lhs_expr
->operands
[0]->clone(ctx
, NULL
);
782 ir_variable
*lhs_var
= lhs
->variable_referenced();
784 lhs_var
->data
.assigned
= true;
786 if (!error_emitted
) {
787 if (non_lvalue_description
!= NULL
) {
788 _mesa_glsl_error(&lhs_loc
, state
,
790 non_lvalue_description
);
791 error_emitted
= true;
792 } else if (lhs
->variable_referenced() != NULL
793 && lhs
->variable_referenced()->data
.read_only
) {
794 _mesa_glsl_error(&lhs_loc
, state
,
795 "assignment to read-only variable '%s'",
796 lhs
->variable_referenced()->name
);
797 error_emitted
= true;
799 } else if (lhs
->type
->is_array() &&
800 !state
->check_version(120, 300, &lhs_loc
,
801 "whole array assignment forbidden")) {
802 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
804 * "Other binary or unary expressions, non-dereferenced
805 * arrays, function names, swizzles with repeated fields,
806 * and constants cannot be l-values."
808 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
810 error_emitted
= true;
811 } else if (!lhs
->is_lvalue()) {
812 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
813 error_emitted
= true;
818 validate_assignment(state
, lhs_loc
, lhs
->type
, rhs
, is_initializer
);
819 if (new_rhs
!= NULL
) {
822 /* If the LHS array was not declared with a size, it takes it size from
823 * the RHS. If the LHS is an l-value and a whole array, it must be a
824 * dereference of a variable. Any other case would require that the LHS
825 * is either not an l-value or not a whole array.
827 if (lhs
->type
->is_unsized_array()) {
828 ir_dereference
*const d
= lhs
->as_dereference();
832 ir_variable
*const var
= d
->variable_referenced();
836 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
837 /* FINISHME: This should actually log the location of the RHS. */
838 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
840 var
->data
.max_array_access
);
843 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
844 rhs
->type
->array_size());
847 if (lhs
->type
->is_array()) {
848 mark_whole_array_access(rhs
);
849 mark_whole_array_access(lhs
);
853 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
854 * but not post_inc) need the converted assigned value as an rvalue
855 * to handle things like:
859 * So we always just store the computed value being assigned to a
860 * temporary and return a deref of that temporary. If the rvalue
861 * ends up not being used, the temp will get copy-propagated out.
863 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
865 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
866 instructions
->push_tail(var
);
867 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
868 deref_var
= new(ctx
) ir_dereference_variable(var
);
871 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
873 if (extract_channel
) {
874 return new(ctx
) ir_expression(ir_binop_vector_extract
,
875 new(ctx
) ir_dereference_variable(var
),
876 extract_channel
->clone(ctx
, NULL
));
878 return new(ctx
) ir_dereference_variable(var
);
882 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
884 void *ctx
= ralloc_parent(lvalue
);
887 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
889 instructions
->push_tail(var
);
890 var
->data
.mode
= ir_var_auto
;
892 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
895 return new(ctx
) ir_dereference_variable(var
);
900 ast_node::hir(exec_list
*instructions
,
901 struct _mesa_glsl_parse_state
*state
)
910 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
913 ir_rvalue
*cmp
= NULL
;
915 if (operation
== ir_binop_all_equal
)
916 join_op
= ir_binop_logic_and
;
918 join_op
= ir_binop_logic_or
;
920 switch (op0
->type
->base_type
) {
921 case GLSL_TYPE_FLOAT
:
925 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
927 case GLSL_TYPE_ARRAY
: {
928 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
929 ir_rvalue
*e0
, *e1
, *result
;
931 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
932 new(mem_ctx
) ir_constant(i
));
933 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
934 new(mem_ctx
) ir_constant(i
));
935 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
938 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
944 mark_whole_array_access(op0
);
945 mark_whole_array_access(op1
);
949 case GLSL_TYPE_STRUCT
: {
950 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
951 ir_rvalue
*e0
, *e1
, *result
;
952 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
954 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
956 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
958 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
961 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
969 case GLSL_TYPE_ERROR
:
971 case GLSL_TYPE_SAMPLER
:
972 case GLSL_TYPE_IMAGE
:
973 case GLSL_TYPE_INTERFACE
:
974 case GLSL_TYPE_ATOMIC_UINT
:
975 /* I assume a comparison of a struct containing a sampler just
976 * ignores the sampler present in the type.
982 cmp
= new(mem_ctx
) ir_constant(true);
987 /* For logical operations, we want to ensure that the operands are
988 * scalar booleans. If it isn't, emit an error and return a constant
989 * boolean to avoid triggering cascading error messages.
992 get_scalar_boolean_operand(exec_list
*instructions
,
993 struct _mesa_glsl_parse_state
*state
,
994 ast_expression
*parent_expr
,
996 const char *operand_name
,
999 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1001 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1003 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1006 if (!*error_emitted
) {
1007 YYLTYPE loc
= expr
->get_location();
1008 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1010 parent_expr
->operator_string(parent_expr
->oper
));
1011 *error_emitted
= true;
1014 return new(ctx
) ir_constant(true);
1018 * If name refers to a builtin array whose maximum allowed size is less than
1019 * size, report an error and return true. Otherwise return false.
1022 check_builtin_array_max_size(const char *name
, unsigned size
,
1023 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1025 if ((strcmp("gl_TexCoord", name
) == 0)
1026 && (size
> state
->Const
.MaxTextureCoords
)) {
1027 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1029 * "The size [of gl_TexCoord] can be at most
1030 * gl_MaxTextureCoords."
1032 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1033 "be larger than gl_MaxTextureCoords (%u)",
1034 state
->Const
.MaxTextureCoords
);
1035 } else if (strcmp("gl_ClipDistance", name
) == 0
1036 && size
> state
->Const
.MaxClipPlanes
) {
1037 /* From section 7.1 (Vertex Shader Special Variables) of the
1040 * "The gl_ClipDistance array is predeclared as unsized and
1041 * must be sized by the shader either redeclaring it with a
1042 * size or indexing it only with integral constant
1043 * expressions. ... The size can be at most
1044 * gl_MaxClipDistances."
1046 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1047 "be larger than gl_MaxClipDistances (%u)",
1048 state
->Const
.MaxClipPlanes
);
1053 * Create the constant 1, of a which is appropriate for incrementing and
1054 * decrementing values of the given GLSL type. For example, if type is vec4,
1055 * this creates a constant value of 1.0 having type float.
1057 * If the given type is invalid for increment and decrement operators, return
1058 * a floating point 1--the error will be detected later.
1061 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1063 switch (type
->base_type
) {
1064 case GLSL_TYPE_UINT
:
1065 return new(ctx
) ir_constant((unsigned) 1);
1067 return new(ctx
) ir_constant(1);
1069 case GLSL_TYPE_FLOAT
:
1070 return new(ctx
) ir_constant(1.0f
);
1075 ast_expression::hir(exec_list
*instructions
,
1076 struct _mesa_glsl_parse_state
*state
)
1079 static const int operations
[AST_NUM_OPERATORS
] = {
1080 -1, /* ast_assign doesn't convert to ir_expression. */
1081 -1, /* ast_plus doesn't convert to ir_expression. */
1095 ir_binop_any_nequal
,
1105 /* Note: The following block of expression types actually convert
1106 * to multiple IR instructions.
1108 ir_binop_mul
, /* ast_mul_assign */
1109 ir_binop_div
, /* ast_div_assign */
1110 ir_binop_mod
, /* ast_mod_assign */
1111 ir_binop_add
, /* ast_add_assign */
1112 ir_binop_sub
, /* ast_sub_assign */
1113 ir_binop_lshift
, /* ast_ls_assign */
1114 ir_binop_rshift
, /* ast_rs_assign */
1115 ir_binop_bit_and
, /* ast_and_assign */
1116 ir_binop_bit_xor
, /* ast_xor_assign */
1117 ir_binop_bit_or
, /* ast_or_assign */
1119 -1, /* ast_conditional doesn't convert to ir_expression. */
1120 ir_binop_add
, /* ast_pre_inc. */
1121 ir_binop_sub
, /* ast_pre_dec. */
1122 ir_binop_add
, /* ast_post_inc. */
1123 ir_binop_sub
, /* ast_post_dec. */
1124 -1, /* ast_field_selection doesn't conv to ir_expression. */
1125 -1, /* ast_array_index doesn't convert to ir_expression. */
1126 -1, /* ast_function_call doesn't conv to ir_expression. */
1127 -1, /* ast_identifier doesn't convert to ir_expression. */
1128 -1, /* ast_int_constant doesn't convert to ir_expression. */
1129 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1130 -1, /* ast_float_constant doesn't conv to ir_expression. */
1131 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1132 -1, /* ast_sequence doesn't convert to ir_expression. */
1134 ir_rvalue
*result
= NULL
;
1136 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1137 bool error_emitted
= false;
1140 loc
= this->get_location();
1142 switch (this->oper
) {
1144 assert(!"ast_aggregate: Should never get here.");
1148 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1149 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1151 result
= do_assignment(instructions
, state
,
1152 this->subexpressions
[0]->non_lvalue_description
,
1153 op
[0], op
[1], false,
1154 this->subexpressions
[0]->get_location());
1155 error_emitted
= result
->type
->is_error();
1160 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1162 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1164 error_emitted
= type
->is_error();
1170 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1172 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1174 error_emitted
= type
->is_error();
1176 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1184 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1185 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1187 type
= arithmetic_result_type(op
[0], op
[1],
1188 (this->oper
== ast_mul
),
1190 error_emitted
= type
->is_error();
1192 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1197 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1198 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1200 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1202 assert(operations
[this->oper
] == ir_binop_mod
);
1204 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1206 error_emitted
= type
->is_error();
1211 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1212 error_emitted
= true;
1215 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1216 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1217 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1219 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1221 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1228 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1229 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1231 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1233 /* The relational operators must either generate an error or result
1234 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1236 assert(type
->is_error()
1237 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1238 && type
->is_scalar()));
1240 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1242 error_emitted
= type
->is_error();
1247 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1248 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1250 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1252 * "The equality operators equal (==), and not equal (!=)
1253 * operate on all types. They result in a scalar Boolean. If
1254 * the operand types do not match, then there must be a
1255 * conversion from Section 4.1.10 "Implicit Conversions"
1256 * applied to one operand that can make them match, in which
1257 * case this conversion is done."
1259 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1260 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1261 || (op
[0]->type
!= op
[1]->type
)) {
1262 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1263 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1264 error_emitted
= true;
1265 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1266 !state
->check_version(120, 300, &loc
,
1267 "array comparisons forbidden")) {
1268 error_emitted
= true;
1269 } else if ((op
[0]->type
->contains_opaque() ||
1270 op
[1]->type
->contains_opaque())) {
1271 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1272 error_emitted
= true;
1275 if (error_emitted
) {
1276 result
= new(ctx
) ir_constant(false);
1278 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1279 assert(result
->type
== glsl_type::bool_type
);
1286 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1287 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1288 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1290 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1292 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1296 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1298 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1299 error_emitted
= true;
1302 if (!op
[0]->type
->is_integer()) {
1303 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1304 error_emitted
= true;
1307 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1308 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1311 case ast_logic_and
: {
1312 exec_list rhs_instructions
;
1313 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1314 "LHS", &error_emitted
);
1315 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1316 "RHS", &error_emitted
);
1318 if (rhs_instructions
.is_empty()) {
1319 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1320 type
= result
->type
;
1322 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1325 instructions
->push_tail(tmp
);
1327 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1328 instructions
->push_tail(stmt
);
1330 stmt
->then_instructions
.append_list(&rhs_instructions
);
1331 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1332 ir_assignment
*const then_assign
=
1333 new(ctx
) ir_assignment(then_deref
, op
[1]);
1334 stmt
->then_instructions
.push_tail(then_assign
);
1336 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1337 ir_assignment
*const else_assign
=
1338 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1339 stmt
->else_instructions
.push_tail(else_assign
);
1341 result
= new(ctx
) ir_dereference_variable(tmp
);
1347 case ast_logic_or
: {
1348 exec_list rhs_instructions
;
1349 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1350 "LHS", &error_emitted
);
1351 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1352 "RHS", &error_emitted
);
1354 if (rhs_instructions
.is_empty()) {
1355 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1356 type
= result
->type
;
1358 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1361 instructions
->push_tail(tmp
);
1363 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1364 instructions
->push_tail(stmt
);
1366 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1367 ir_assignment
*const then_assign
=
1368 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1369 stmt
->then_instructions
.push_tail(then_assign
);
1371 stmt
->else_instructions
.append_list(&rhs_instructions
);
1372 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1373 ir_assignment
*const else_assign
=
1374 new(ctx
) ir_assignment(else_deref
, op
[1]);
1375 stmt
->else_instructions
.push_tail(else_assign
);
1377 result
= new(ctx
) ir_dereference_variable(tmp
);
1384 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1386 * "The logical binary operators and (&&), or ( | | ), and
1387 * exclusive or (^^). They operate only on two Boolean
1388 * expressions and result in a Boolean expression."
1390 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1392 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1395 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1400 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1401 "operand", &error_emitted
);
1403 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1407 case ast_mul_assign
:
1408 case ast_div_assign
:
1409 case ast_add_assign
:
1410 case ast_sub_assign
: {
1411 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1412 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1414 type
= arithmetic_result_type(op
[0], op
[1],
1415 (this->oper
== ast_mul_assign
),
1418 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1421 result
= do_assignment(instructions
, state
,
1422 this->subexpressions
[0]->non_lvalue_description
,
1423 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1424 this->subexpressions
[0]->get_location());
1425 error_emitted
= (op
[0]->type
->is_error());
1427 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1428 * explicitly test for this because none of the binary expression
1429 * operators allow array operands either.
1435 case ast_mod_assign
: {
1436 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1437 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1439 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1441 assert(operations
[this->oper
] == ir_binop_mod
);
1443 ir_rvalue
*temp_rhs
;
1444 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1447 result
= do_assignment(instructions
, state
,
1448 this->subexpressions
[0]->non_lvalue_description
,
1449 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1450 this->subexpressions
[0]->get_location());
1451 error_emitted
= type
->is_error();
1456 case ast_rs_assign
: {
1457 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1458 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1459 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1461 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1462 type
, op
[0], op
[1]);
1463 result
= do_assignment(instructions
, state
,
1464 this->subexpressions
[0]->non_lvalue_description
,
1465 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1466 this->subexpressions
[0]->get_location());
1467 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1471 case ast_and_assign
:
1472 case ast_xor_assign
:
1473 case ast_or_assign
: {
1474 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1475 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1476 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1478 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1479 type
, op
[0], op
[1]);
1480 result
= do_assignment(instructions
, state
,
1481 this->subexpressions
[0]->non_lvalue_description
,
1482 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1483 this->subexpressions
[0]->get_location());
1484 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1488 case ast_conditional
: {
1489 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1491 * "The ternary selection operator (?:). It operates on three
1492 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1493 * first expression, which must result in a scalar Boolean."
1495 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1496 "condition", &error_emitted
);
1498 /* The :? operator is implemented by generating an anonymous temporary
1499 * followed by an if-statement. The last instruction in each branch of
1500 * the if-statement assigns a value to the anonymous temporary. This
1501 * temporary is the r-value of the expression.
1503 exec_list then_instructions
;
1504 exec_list else_instructions
;
1506 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1507 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1509 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1511 * "The second and third expressions can be any type, as
1512 * long their types match, or there is a conversion in
1513 * Section 4.1.10 "Implicit Conversions" that can be applied
1514 * to one of the expressions to make their types match. This
1515 * resulting matching type is the type of the entire
1518 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1519 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1520 || (op
[1]->type
!= op
[2]->type
)) {
1521 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1523 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1524 "operator must have matching types");
1525 error_emitted
= true;
1526 type
= glsl_type::error_type
;
1531 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1533 * "The second and third expressions must be the same type, but can
1534 * be of any type other than an array."
1536 if (type
->is_array() &&
1537 !state
->check_version(120, 300, &loc
,
1538 "second and third operands of ?: operator "
1539 "cannot be arrays")) {
1540 error_emitted
= true;
1543 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1544 ir_constant
*then_val
= op
[1]->constant_expression_value();
1545 ir_constant
*else_val
= op
[2]->constant_expression_value();
1547 if (then_instructions
.is_empty()
1548 && else_instructions
.is_empty()
1549 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1550 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1552 ir_variable
*const tmp
=
1553 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1554 instructions
->push_tail(tmp
);
1556 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1557 instructions
->push_tail(stmt
);
1559 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1560 ir_dereference
*const then_deref
=
1561 new(ctx
) ir_dereference_variable(tmp
);
1562 ir_assignment
*const then_assign
=
1563 new(ctx
) ir_assignment(then_deref
, op
[1]);
1564 stmt
->then_instructions
.push_tail(then_assign
);
1566 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1567 ir_dereference
*const else_deref
=
1568 new(ctx
) ir_dereference_variable(tmp
);
1569 ir_assignment
*const else_assign
=
1570 new(ctx
) ir_assignment(else_deref
, op
[2]);
1571 stmt
->else_instructions
.push_tail(else_assign
);
1573 result
= new(ctx
) ir_dereference_variable(tmp
);
1580 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1581 ? "pre-increment operation" : "pre-decrement operation";
1583 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1584 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1586 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1588 ir_rvalue
*temp_rhs
;
1589 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1592 result
= do_assignment(instructions
, state
,
1593 this->subexpressions
[0]->non_lvalue_description
,
1594 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1595 this->subexpressions
[0]->get_location());
1596 error_emitted
= op
[0]->type
->is_error();
1601 case ast_post_dec
: {
1602 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1603 ? "post-increment operation" : "post-decrement operation";
1604 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1605 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1607 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1609 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1611 ir_rvalue
*temp_rhs
;
1612 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1615 /* Get a temporary of a copy of the lvalue before it's modified.
1616 * This may get thrown away later.
1618 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1620 (void)do_assignment(instructions
, state
,
1621 this->subexpressions
[0]->non_lvalue_description
,
1622 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1623 this->subexpressions
[0]->get_location());
1625 error_emitted
= op
[0]->type
->is_error();
1629 case ast_field_selection
:
1630 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1633 case ast_array_index
: {
1634 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1636 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1637 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1639 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1642 if (result
->type
->is_error())
1643 error_emitted
= true;
1648 case ast_function_call
:
1649 /* Should *NEVER* get here. ast_function_call should always be handled
1650 * by ast_function_expression::hir.
1655 case ast_identifier
: {
1656 /* ast_identifier can appear several places in a full abstract syntax
1657 * tree. This particular use must be at location specified in the grammar
1658 * as 'variable_identifier'.
1661 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1664 var
->data
.used
= true;
1665 result
= new(ctx
) ir_dereference_variable(var
);
1667 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1668 this->primary_expression
.identifier
);
1670 result
= ir_rvalue::error_value(ctx
);
1671 error_emitted
= true;
1676 case ast_int_constant
:
1677 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1680 case ast_uint_constant
:
1681 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1684 case ast_float_constant
:
1685 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1688 case ast_bool_constant
:
1689 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1692 case ast_sequence
: {
1693 /* It should not be possible to generate a sequence in the AST without
1694 * any expressions in it.
1696 assert(!this->expressions
.is_empty());
1698 /* The r-value of a sequence is the last expression in the sequence. If
1699 * the other expressions in the sequence do not have side-effects (and
1700 * therefore add instructions to the instruction list), they get dropped
1703 exec_node
*previous_tail_pred
= NULL
;
1704 YYLTYPE previous_operand_loc
= loc
;
1706 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1707 /* If one of the operands of comma operator does not generate any
1708 * code, we want to emit a warning. At each pass through the loop
1709 * previous_tail_pred will point to the last instruction in the
1710 * stream *before* processing the previous operand. Naturally,
1711 * instructions->tail_pred will point to the last instruction in the
1712 * stream *after* processing the previous operand. If the two
1713 * pointers match, then the previous operand had no effect.
1715 * The warning behavior here differs slightly from GCC. GCC will
1716 * only emit a warning if none of the left-hand operands have an
1717 * effect. However, it will emit a warning for each. I believe that
1718 * there are some cases in C (especially with GCC extensions) where
1719 * it is useful to have an intermediate step in a sequence have no
1720 * effect, but I don't think these cases exist in GLSL. Either way,
1721 * it would be a giant hassle to replicate that behavior.
1723 if (previous_tail_pred
== instructions
->tail_pred
) {
1724 _mesa_glsl_warning(&previous_operand_loc
, state
,
1725 "left-hand operand of comma expression has "
1729 /* tail_pred is directly accessed instead of using the get_tail()
1730 * method for performance reasons. get_tail() has extra code to
1731 * return NULL when the list is empty. We don't care about that
1732 * here, so using tail_pred directly is fine.
1734 previous_tail_pred
= instructions
->tail_pred
;
1735 previous_operand_loc
= ast
->get_location();
1737 result
= ast
->hir(instructions
, state
);
1740 /* Any errors should have already been emitted in the loop above.
1742 error_emitted
= true;
1746 type
= NULL
; /* use result->type, not type. */
1747 assert(result
!= NULL
);
1749 if (result
->type
->is_error() && !error_emitted
)
1750 _mesa_glsl_error(& loc
, state
, "type mismatch");
1757 ast_expression_statement::hir(exec_list
*instructions
,
1758 struct _mesa_glsl_parse_state
*state
)
1760 /* It is possible to have expression statements that don't have an
1761 * expression. This is the solitary semicolon:
1763 * for (i = 0; i < 5; i++)
1766 * In this case the expression will be NULL. Test for NULL and don't do
1767 * anything in that case.
1769 if (expression
!= NULL
)
1770 expression
->hir(instructions
, state
);
1772 /* Statements do not have r-values.
1779 ast_compound_statement::hir(exec_list
*instructions
,
1780 struct _mesa_glsl_parse_state
*state
)
1783 state
->symbols
->push_scope();
1785 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1786 ast
->hir(instructions
, state
);
1789 state
->symbols
->pop_scope();
1791 /* Compound statements do not have r-values.
1797 * Evaluate the given exec_node (which should be an ast_node representing
1798 * a single array dimension) and return its integer value.
1801 process_array_size(exec_node
*node
,
1802 struct _mesa_glsl_parse_state
*state
)
1804 exec_list dummy_instructions
;
1806 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
1807 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
,
1809 YYLTYPE loc
= array_size
->get_location();
1812 _mesa_glsl_error(& loc
, state
,
1813 "array size could not be resolved");
1817 if (!ir
->type
->is_integer()) {
1818 _mesa_glsl_error(& loc
, state
,
1819 "array size must be integer type");
1823 if (!ir
->type
->is_scalar()) {
1824 _mesa_glsl_error(& loc
, state
,
1825 "array size must be scalar type");
1829 ir_constant
*const size
= ir
->constant_expression_value();
1831 _mesa_glsl_error(& loc
, state
, "array size must be a "
1832 "constant valued expression");
1836 if (size
->value
.i
[0] <= 0) {
1837 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1841 assert(size
->type
== ir
->type
);
1843 /* If the array size is const (and we've verified that
1844 * it is) then no instructions should have been emitted
1845 * when we converted it to HIR. If they were emitted,
1846 * then either the array size isn't const after all, or
1847 * we are emitting unnecessary instructions.
1849 assert(dummy_instructions
.is_empty());
1851 return size
->value
.u
[0];
1854 static const glsl_type
*
1855 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
1856 ast_array_specifier
*array_specifier
,
1857 struct _mesa_glsl_parse_state
*state
)
1859 const glsl_type
*array_type
= base
;
1861 if (array_specifier
!= NULL
) {
1862 if (base
->is_array()) {
1864 /* From page 19 (page 25) of the GLSL 1.20 spec:
1866 * "Only one-dimensional arrays may be declared."
1868 if (!state
->ARB_arrays_of_arrays_enable
) {
1869 _mesa_glsl_error(loc
, state
,
1870 "invalid array of `%s'"
1871 "GL_ARB_arrays_of_arrays "
1872 "required for defining arrays of arrays",
1874 return glsl_type::error_type
;
1877 if (base
->length
== 0) {
1878 _mesa_glsl_error(loc
, state
,
1879 "only the outermost array dimension can "
1882 return glsl_type::error_type
;
1886 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
1887 !node
->is_head_sentinel(); node
= node
->prev
) {
1888 unsigned array_size
= process_array_size(node
, state
);
1889 array_type
= glsl_type::get_array_instance(array_type
,
1893 if (array_specifier
->is_unsized_array
)
1894 array_type
= glsl_type::get_array_instance(array_type
, 0);
1902 ast_type_specifier::glsl_type(const char **name
,
1903 struct _mesa_glsl_parse_state
*state
) const
1905 const struct glsl_type
*type
;
1907 type
= state
->symbols
->get_type(this->type_name
);
1908 *name
= this->type_name
;
1910 YYLTYPE loc
= this->get_location();
1911 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
1917 ast_fully_specified_type::glsl_type(const char **name
,
1918 struct _mesa_glsl_parse_state
*state
) const
1920 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
1925 if (type
->base_type
== GLSL_TYPE_FLOAT
1927 && state
->stage
== MESA_SHADER_FRAGMENT
1928 && this->qualifier
.precision
== ast_precision_none
1929 && state
->symbols
->get_variable("#default precision") == NULL
) {
1930 YYLTYPE loc
= this->get_location();
1931 _mesa_glsl_error(&loc
, state
,
1932 "no precision specified this scope for type `%s'",
1940 * Determine whether a toplevel variable declaration declares a varying. This
1941 * function operates by examining the variable's mode and the shader target,
1942 * so it correctly identifies linkage variables regardless of whether they are
1943 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1945 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1946 * this function will produce undefined results.
1949 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
1952 case MESA_SHADER_VERTEX
:
1953 return var
->data
.mode
== ir_var_shader_out
;
1954 case MESA_SHADER_FRAGMENT
:
1955 return var
->data
.mode
== ir_var_shader_in
;
1957 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
1963 * Matrix layout qualifiers are only allowed on certain types
1966 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1968 const glsl_type
*type
,
1971 if (var
&& !var
->is_in_uniform_block()) {
1972 /* Layout qualifiers may only apply to interface blocks and fields in
1975 _mesa_glsl_error(loc
, state
,
1976 "uniform block layout qualifiers row_major and "
1977 "column_major may not be applied to variables "
1978 "outside of uniform blocks");
1979 } else if (!type
->is_matrix()) {
1980 /* The OpenGL ES 3.0 conformance tests did not originally allow
1981 * matrix layout qualifiers on non-matrices. However, the OpenGL
1982 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
1983 * amended to specifically allow these layouts on all types. Emit
1984 * a warning so that people know their code may not be portable.
1986 _mesa_glsl_warning(loc
, state
,
1987 "uniform block layout qualifiers row_major and "
1988 "column_major applied to non-matrix types may "
1989 "be rejected by older compilers");
1990 } else if (type
->is_record()) {
1991 /* We allow 'layout(row_major)' on structure types because it's the only
1992 * way to get row-major layouts on matrices contained in structures.
1994 _mesa_glsl_warning(loc
, state
,
1995 "uniform block layout qualifiers row_major and "
1996 "column_major applied to structure types is not "
1997 "strictly conformant and may be rejected by other "
2003 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
2006 const ast_type_qualifier
*qual
)
2008 if (var
->data
.mode
!= ir_var_uniform
) {
2009 _mesa_glsl_error(loc
, state
,
2010 "the \"binding\" qualifier only applies to uniforms");
2014 if (qual
->binding
< 0) {
2015 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
2019 const struct gl_context
*const ctx
= state
->ctx
;
2020 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
2021 unsigned max_index
= qual
->binding
+ elements
- 1;
2023 if (var
->type
->is_interface()) {
2024 /* UBOs. From page 60 of the GLSL 4.20 specification:
2025 * "If the binding point for any uniform block instance is less than zero,
2026 * or greater than or equal to the implementation-dependent maximum
2027 * number of uniform buffer bindings, a compilation error will occur.
2028 * When the binding identifier is used with a uniform block instanced as
2029 * an array of size N, all elements of the array from binding through
2030 * binding + N – 1 must be within this range."
2032 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2034 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2035 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
2036 "the maximum number of UBO binding points (%d)",
2037 qual
->binding
, elements
,
2038 ctx
->Const
.MaxUniformBufferBindings
);
2041 } else if (var
->type
->is_sampler() ||
2042 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
2043 /* Samplers. From page 63 of the GLSL 4.20 specification:
2044 * "If the binding is less than zero, or greater than or equal to the
2045 * implementation-dependent maximum supported number of units, a
2046 * compilation error will occur. When the binding identifier is used
2047 * with an array of size N, all elements of the array from binding
2048 * through binding + N - 1 must be within this range."
2050 unsigned limit
= ctx
->Const
.Program
[state
->stage
].MaxTextureImageUnits
;
2052 if (max_index
>= limit
) {
2053 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2054 "exceeds the maximum number of texture image units "
2055 "(%d)", qual
->binding
, elements
, limit
);
2059 } else if (var
->type
->contains_atomic()) {
2060 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2061 if (unsigned(qual
->binding
) >= ctx
->Const
.MaxAtomicBufferBindings
) {
2062 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2063 " maximum number of atomic counter buffer bindings"
2064 "(%d)", qual
->binding
,
2065 ctx
->Const
.MaxAtomicBufferBindings
);
2070 _mesa_glsl_error(loc
, state
,
2071 "the \"binding\" qualifier only applies to uniform "
2072 "blocks, samplers, atomic counters, or arrays thereof");
2080 static glsl_interp_qualifier
2081 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2082 ir_variable_mode mode
,
2083 struct _mesa_glsl_parse_state
*state
,
2086 glsl_interp_qualifier interpolation
;
2087 if (qual
->flags
.q
.flat
)
2088 interpolation
= INTERP_QUALIFIER_FLAT
;
2089 else if (qual
->flags
.q
.noperspective
)
2090 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2091 else if (qual
->flags
.q
.smooth
)
2092 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2094 interpolation
= INTERP_QUALIFIER_NONE
;
2096 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2097 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2098 _mesa_glsl_error(loc
, state
,
2099 "interpolation qualifier `%s' can only be applied to "
2100 "shader inputs or outputs.",
2101 interpolation_string(interpolation
));
2105 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2106 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2107 _mesa_glsl_error(loc
, state
,
2108 "interpolation qualifier `%s' cannot be applied to "
2109 "vertex shader inputs or fragment shader outputs",
2110 interpolation_string(interpolation
));
2114 return interpolation
;
2119 validate_explicit_location(const struct ast_type_qualifier
*qual
,
2121 struct _mesa_glsl_parse_state
*state
,
2126 /* Between GL_ARB_explicit_attrib_location an
2127 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2128 * stage can be assigned explicit locations. The checking here associates
2129 * the correct extension with the correct stage's input / output:
2133 * vertex explicit_loc sso
2135 * fragment sso explicit_loc
2137 switch (state
->stage
) {
2138 case MESA_SHADER_VERTEX
:
2139 if (var
->data
.mode
== ir_var_shader_in
) {
2140 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2146 if (var
->data
.mode
== ir_var_shader_out
) {
2147 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2156 case MESA_SHADER_GEOMETRY
:
2157 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2158 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2167 case MESA_SHADER_FRAGMENT
:
2168 if (var
->data
.mode
== ir_var_shader_in
) {
2169 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2175 if (var
->data
.mode
== ir_var_shader_out
) {
2176 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2185 case MESA_SHADER_COMPUTE
:
2186 _mesa_glsl_error(loc
, state
,
2187 "compute shader variables cannot be given "
2188 "explicit locations");
2193 _mesa_glsl_error(loc
, state
,
2194 "%s cannot be given an explicit location in %s shader",
2196 _mesa_shader_stage_to_string(state
->stage
));
2198 var
->data
.explicit_location
= true;
2200 /* This bit of silliness is needed because invalid explicit locations
2201 * are supposed to be flagged during linking. Small negative values
2202 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2203 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2204 * The linker needs to be able to differentiate these cases. This
2205 * ensures that negative values stay negative.
2207 if (qual
->location
>= 0) {
2208 switch (state
->stage
) {
2209 case MESA_SHADER_VERTEX
:
2210 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2211 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2212 : (qual
->location
+ VARYING_SLOT_VAR0
);
2215 case MESA_SHADER_GEOMETRY
:
2216 var
->data
.location
= qual
->location
+ VARYING_SLOT_VAR0
;
2219 case MESA_SHADER_FRAGMENT
:
2220 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2221 ? (qual
->location
+ FRAG_RESULT_DATA0
)
2222 : (qual
->location
+ VARYING_SLOT_VAR0
);
2224 case MESA_SHADER_COMPUTE
:
2225 assert(!"Unexpected shader type");
2229 var
->data
.location
= qual
->location
;
2232 if (qual
->flags
.q
.explicit_index
) {
2233 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2234 * Layout Qualifiers):
2236 * "It is also a compile-time error if a fragment shader
2237 * sets a layout index to less than 0 or greater than 1."
2239 * Older specifications don't mandate a behavior; we take
2240 * this as a clarification and always generate the error.
2242 if (qual
->index
< 0 || qual
->index
> 1) {
2243 _mesa_glsl_error(loc
, state
,
2244 "explicit index may only be 0 or 1");
2246 var
->data
.explicit_index
= true;
2247 var
->data
.index
= qual
->index
;
2254 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2256 struct _mesa_glsl_parse_state
*state
,
2259 const glsl_type
*base_type
=
2260 (var
->type
->is_array() ? var
->type
->element_type() : var
->type
);
2262 if (base_type
->is_image()) {
2263 if (var
->data
.mode
!= ir_var_uniform
&&
2264 var
->data
.mode
!= ir_var_function_in
) {
2265 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2266 "function parameters or uniform-qualified "
2267 "global variables");
2270 var
->data
.image
.read_only
|= qual
->flags
.q
.read_only
;
2271 var
->data
.image
.write_only
|= qual
->flags
.q
.write_only
;
2272 var
->data
.image
.coherent
|= qual
->flags
.q
.coherent
;
2273 var
->data
.image
._volatile
|= qual
->flags
.q
._volatile
;
2274 var
->data
.image
.restrict_flag
|= qual
->flags
.q
.restrict_flag
;
2275 var
->data
.read_only
= true;
2277 if (qual
->flags
.q
.explicit_image_format
) {
2278 if (var
->data
.mode
== ir_var_function_in
) {
2279 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2280 "used on image function parameters");
2283 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2284 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2285 "base data type of the image");
2288 var
->data
.image
.format
= qual
->image_format
;
2290 if (var
->data
.mode
== ir_var_uniform
&& !qual
->flags
.q
.write_only
) {
2291 _mesa_glsl_error(loc
, state
, "uniforms not qualified with "
2292 "`writeonly' must have a format layout "
2296 var
->data
.image
.format
= GL_NONE
;
2302 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2304 struct _mesa_glsl_parse_state
*state
,
2308 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2310 if (qual
->flags
.q
.invariant
) {
2311 if (var
->data
.used
) {
2312 _mesa_glsl_error(loc
, state
,
2313 "variable `%s' may not be redeclared "
2314 "`invariant' after being used",
2317 var
->data
.invariant
= 1;
2321 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2322 || qual
->flags
.q
.uniform
2323 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2324 var
->data
.read_only
= 1;
2326 if (qual
->flags
.q
.centroid
)
2327 var
->data
.centroid
= 1;
2329 if (qual
->flags
.q
.sample
)
2330 var
->data
.sample
= 1;
2332 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
2333 var
->type
= glsl_type::error_type
;
2334 _mesa_glsl_error(loc
, state
,
2335 "`attribute' variables may not be declared in the "
2337 _mesa_shader_stage_to_string(state
->stage
));
2340 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2342 * "However, the const qualifier cannot be used with out or inout."
2344 * The same section of the GLSL 4.40 spec further clarifies this saying:
2346 * "The const qualifier cannot be used with out or inout, or a
2347 * compile-time error results."
2349 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2350 _mesa_glsl_error(loc
, state
,
2351 "`const' may not be applied to `out' or `inout' "
2352 "function parameters");
2355 /* If there is no qualifier that changes the mode of the variable, leave
2356 * the setting alone.
2358 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2359 var
->data
.mode
= ir_var_function_inout
;
2360 else if (qual
->flags
.q
.in
)
2361 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2362 else if (qual
->flags
.q
.attribute
2363 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2364 var
->data
.mode
= ir_var_shader_in
;
2365 else if (qual
->flags
.q
.out
)
2366 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2367 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
2368 var
->data
.mode
= ir_var_shader_out
;
2369 else if (qual
->flags
.q
.uniform
)
2370 var
->data
.mode
= ir_var_uniform
;
2372 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
2373 /* User-defined ins/outs are not permitted in compute shaders. */
2374 if (state
->stage
== MESA_SHADER_COMPUTE
) {
2375 _mesa_glsl_error(loc
, state
,
2376 "user-defined input and output variables are not "
2377 "permitted in compute shaders");
2380 /* This variable is being used to link data between shader stages (in
2381 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2382 * that is allowed for such purposes.
2384 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2386 * "The varying qualifier can be used only with the data types
2387 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2390 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2391 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2393 * "Fragment inputs can only be signed and unsigned integers and
2394 * integer vectors, float, floating-point vectors, matrices, or
2395 * arrays of these. Structures cannot be input.
2397 * Similar text exists in the section on vertex shader outputs.
2399 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2400 * 3.00 spec allows structs as well. Varying structs are also allowed
2403 switch (var
->type
->get_scalar_type()->base_type
) {
2404 case GLSL_TYPE_FLOAT
:
2405 /* Ok in all GLSL versions */
2407 case GLSL_TYPE_UINT
:
2409 if (state
->is_version(130, 300))
2411 _mesa_glsl_error(loc
, state
,
2412 "varying variables must be of base type float in %s",
2413 state
->get_version_string());
2415 case GLSL_TYPE_STRUCT
:
2416 if (state
->is_version(150, 300))
2418 _mesa_glsl_error(loc
, state
,
2419 "varying variables may not be of type struct");
2422 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2427 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2428 switch (state
->stage
) {
2429 case MESA_SHADER_VERTEX
:
2430 if (var
->data
.mode
== ir_var_shader_out
)
2431 var
->data
.invariant
= true;
2433 case MESA_SHADER_GEOMETRY
:
2434 if ((var
->data
.mode
== ir_var_shader_in
)
2435 || (var
->data
.mode
== ir_var_shader_out
))
2436 var
->data
.invariant
= true;
2438 case MESA_SHADER_FRAGMENT
:
2439 if (var
->data
.mode
== ir_var_shader_in
)
2440 var
->data
.invariant
= true;
2442 case MESA_SHADER_COMPUTE
:
2443 /* Invariance isn't meaningful in compute shaders. */
2448 var
->data
.interpolation
=
2449 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
2452 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2453 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2454 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2455 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2456 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2457 ? "origin_upper_left" : "pixel_center_integer";
2459 _mesa_glsl_error(loc
, state
,
2460 "layout qualifier `%s' can only be applied to "
2461 "fragment shader input `gl_FragCoord'",
2465 if (qual
->flags
.q
.explicit_location
) {
2466 validate_explicit_location(qual
, var
, state
, loc
);
2467 } else if (qual
->flags
.q
.explicit_index
) {
2468 _mesa_glsl_error(loc
, state
,
2469 "explicit index requires explicit location");
2472 if (qual
->flags
.q
.explicit_binding
&&
2473 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2474 var
->data
.explicit_binding
= true;
2475 var
->data
.binding
= qual
->binding
;
2478 if (var
->type
->contains_atomic()) {
2479 if (var
->data
.mode
== ir_var_uniform
) {
2480 if (var
->data
.explicit_binding
) {
2482 &state
->atomic_counter_offsets
[var
->data
.binding
];
2484 if (*offset
% ATOMIC_COUNTER_SIZE
)
2485 _mesa_glsl_error(loc
, state
,
2486 "misaligned atomic counter offset");
2488 var
->data
.atomic
.offset
= *offset
;
2489 *offset
+= var
->type
->atomic_size();
2492 _mesa_glsl_error(loc
, state
,
2493 "atomic counters require explicit binding point");
2495 } else if (var
->data
.mode
!= ir_var_function_in
) {
2496 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
2497 "function parameters or uniform-qualified "
2498 "global variables");
2502 /* Does the declaration use the deprecated 'attribute' or 'varying'
2505 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2506 || qual
->flags
.q
.varying
;
2508 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2509 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2510 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2511 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2512 * These extensions and all following extensions that add the 'layout'
2513 * keyword have been modified to require the use of 'in' or 'out'.
2515 * The following extension do not allow the deprecated keywords:
2517 * GL_AMD_conservative_depth
2518 * GL_ARB_conservative_depth
2519 * GL_ARB_gpu_shader5
2520 * GL_ARB_separate_shader_objects
2521 * GL_ARB_tesselation_shader
2522 * GL_ARB_transform_feedback3
2523 * GL_ARB_uniform_buffer_object
2525 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2526 * allow layout with the deprecated keywords.
2528 const bool relaxed_layout_qualifier_checking
=
2529 state
->ARB_fragment_coord_conventions_enable
;
2531 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2532 if (relaxed_layout_qualifier_checking
) {
2533 _mesa_glsl_warning(loc
, state
,
2534 "`layout' qualifier may not be used with "
2535 "`attribute' or `varying'");
2537 _mesa_glsl_error(loc
, state
,
2538 "`layout' qualifier may not be used with "
2539 "`attribute' or `varying'");
2543 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2544 * AMD_conservative_depth.
2546 int depth_layout_count
= qual
->flags
.q
.depth_any
2547 + qual
->flags
.q
.depth_greater
2548 + qual
->flags
.q
.depth_less
2549 + qual
->flags
.q
.depth_unchanged
;
2550 if (depth_layout_count
> 0
2551 && !state
->AMD_conservative_depth_enable
2552 && !state
->ARB_conservative_depth_enable
) {
2553 _mesa_glsl_error(loc
, state
,
2554 "extension GL_AMD_conservative_depth or "
2555 "GL_ARB_conservative_depth must be enabled "
2556 "to use depth layout qualifiers");
2557 } else if (depth_layout_count
> 0
2558 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2559 _mesa_glsl_error(loc
, state
,
2560 "depth layout qualifiers can be applied only to "
2562 } else if (depth_layout_count
> 1
2563 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2564 _mesa_glsl_error(loc
, state
,
2565 "at most one depth layout qualifier can be applied to "
2568 if (qual
->flags
.q
.depth_any
)
2569 var
->data
.depth_layout
= ir_depth_layout_any
;
2570 else if (qual
->flags
.q
.depth_greater
)
2571 var
->data
.depth_layout
= ir_depth_layout_greater
;
2572 else if (qual
->flags
.q
.depth_less
)
2573 var
->data
.depth_layout
= ir_depth_layout_less
;
2574 else if (qual
->flags
.q
.depth_unchanged
)
2575 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
2577 var
->data
.depth_layout
= ir_depth_layout_none
;
2579 if (qual
->flags
.q
.std140
||
2580 qual
->flags
.q
.packed
||
2581 qual
->flags
.q
.shared
) {
2582 _mesa_glsl_error(loc
, state
,
2583 "uniform block layout qualifiers std140, packed, and "
2584 "shared can only be applied to uniform blocks, not "
2588 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2589 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
2592 if (var
->type
->contains_image())
2593 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
2597 * Get the variable that is being redeclared by this declaration
2599 * Semantic checks to verify the validity of the redeclaration are also
2600 * performed. If semantic checks fail, compilation error will be emitted via
2601 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2604 * A pointer to an existing variable in the current scope if the declaration
2605 * is a redeclaration, \c NULL otherwise.
2607 static ir_variable
*
2608 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
2609 struct _mesa_glsl_parse_state
*state
,
2610 bool allow_all_redeclarations
)
2612 /* Check if this declaration is actually a re-declaration, either to
2613 * resize an array or add qualifiers to an existing variable.
2615 * This is allowed for variables in the current scope, or when at
2616 * global scope (for built-ins in the implicit outer scope).
2618 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
2619 if (earlier
== NULL
||
2620 (state
->current_function
!= NULL
&&
2621 !state
->symbols
->name_declared_this_scope(var
->name
))) {
2626 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2628 * "It is legal to declare an array without a size and then
2629 * later re-declare the same name as an array of the same
2630 * type and specify a size."
2632 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
2633 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2634 /* FINISHME: This doesn't match the qualifiers on the two
2635 * FINISHME: declarations. It's not 100% clear whether this is
2636 * FINISHME: required or not.
2639 const unsigned size
= unsigned(var
->type
->array_size());
2640 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2641 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
2642 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2644 earlier
->data
.max_array_access
);
2647 earlier
->type
= var
->type
;
2650 } else if ((state
->ARB_fragment_coord_conventions_enable
||
2651 state
->is_version(150, 0))
2652 && strcmp(var
->name
, "gl_FragCoord") == 0
2653 && earlier
->type
== var
->type
2654 && earlier
->data
.mode
== var
->data
.mode
) {
2655 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2658 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
2659 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
2661 /* According to section 4.3.7 of the GLSL 1.30 spec,
2662 * the following built-in varaibles can be redeclared with an
2663 * interpolation qualifier:
2666 * * gl_FrontSecondaryColor
2667 * * gl_BackSecondaryColor
2669 * * gl_SecondaryColor
2671 } else if (state
->is_version(130, 0)
2672 && (strcmp(var
->name
, "gl_FrontColor") == 0
2673 || strcmp(var
->name
, "gl_BackColor") == 0
2674 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2675 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2676 || strcmp(var
->name
, "gl_Color") == 0
2677 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2678 && earlier
->type
== var
->type
2679 && earlier
->data
.mode
== var
->data
.mode
) {
2680 earlier
->data
.interpolation
= var
->data
.interpolation
;
2682 /* Layout qualifiers for gl_FragDepth. */
2683 } else if ((state
->AMD_conservative_depth_enable
||
2684 state
->ARB_conservative_depth_enable
)
2685 && strcmp(var
->name
, "gl_FragDepth") == 0
2686 && earlier
->type
== var
->type
2687 && earlier
->data
.mode
== var
->data
.mode
) {
2689 /** From the AMD_conservative_depth spec:
2690 * Within any shader, the first redeclarations of gl_FragDepth
2691 * must appear before any use of gl_FragDepth.
2693 if (earlier
->data
.used
) {
2694 _mesa_glsl_error(&loc
, state
,
2695 "the first redeclaration of gl_FragDepth "
2696 "must appear before any use of gl_FragDepth");
2699 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2700 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
2701 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
2702 _mesa_glsl_error(&loc
, state
,
2703 "gl_FragDepth: depth layout is declared here "
2704 "as '%s, but it was previously declared as "
2706 depth_layout_string(var
->data
.depth_layout
),
2707 depth_layout_string(earlier
->data
.depth_layout
));
2710 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
2712 } else if (allow_all_redeclarations
) {
2713 if (earlier
->data
.mode
!= var
->data
.mode
) {
2714 _mesa_glsl_error(&loc
, state
,
2715 "redeclaration of `%s' with incorrect qualifiers",
2717 } else if (earlier
->type
!= var
->type
) {
2718 _mesa_glsl_error(&loc
, state
,
2719 "redeclaration of `%s' has incorrect type",
2723 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
2730 * Generate the IR for an initializer in a variable declaration
2733 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2734 ast_fully_specified_type
*type
,
2735 exec_list
*initializer_instructions
,
2736 struct _mesa_glsl_parse_state
*state
)
2738 ir_rvalue
*result
= NULL
;
2740 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2742 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2744 * "All uniform variables are read-only and are initialized either
2745 * directly by an application via API commands, or indirectly by
2748 if (var
->data
.mode
== ir_var_uniform
) {
2749 state
->check_version(120, 0, &initializer_loc
,
2750 "cannot initialize uniforms");
2753 /* From section 4.1.7 of the GLSL 4.40 spec:
2755 * "Opaque variables [...] are initialized only through the
2756 * OpenGL API; they cannot be declared with an initializer in a
2759 if (var
->type
->contains_opaque()) {
2760 _mesa_glsl_error(& initializer_loc
, state
,
2761 "cannot initialize opaque variable");
2764 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2765 _mesa_glsl_error(& initializer_loc
, state
,
2766 "cannot initialize %s shader input / %s",
2767 _mesa_shader_stage_to_string(state
->stage
),
2768 (state
->stage
== MESA_SHADER_VERTEX
)
2769 ? "attribute" : "varying");
2772 /* If the initializer is an ast_aggregate_initializer, recursively store
2773 * type information from the LHS into it, so that its hir() function can do
2776 if (decl
->initializer
->oper
== ast_aggregate
)
2777 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
2779 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2780 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2783 /* Calculate the constant value if this is a const or uniform
2786 if (type
->qualifier
.flags
.q
.constant
2787 || type
->qualifier
.flags
.q
.uniform
) {
2788 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
2789 var
->type
, rhs
, true);
2790 if (new_rhs
!= NULL
) {
2793 ir_constant
*constant_value
= rhs
->constant_expression_value();
2794 if (!constant_value
) {
2795 /* If ARB_shading_language_420pack is enabled, initializers of
2796 * const-qualified local variables do not have to be constant
2797 * expressions. Const-qualified global variables must still be
2798 * initialized with constant expressions.
2800 if (!state
->ARB_shading_language_420pack_enable
2801 || state
->current_function
== NULL
) {
2802 _mesa_glsl_error(& initializer_loc
, state
,
2803 "initializer of %s variable `%s' must be a "
2804 "constant expression",
2805 (type
->qualifier
.flags
.q
.constant
)
2806 ? "const" : "uniform",
2808 if (var
->type
->is_numeric()) {
2809 /* Reduce cascading errors. */
2810 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2814 rhs
= constant_value
;
2815 var
->constant_value
= constant_value
;
2818 if (var
->type
->is_numeric()) {
2819 /* Reduce cascading errors. */
2820 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2825 if (rhs
&& !rhs
->type
->is_error()) {
2826 bool temp
= var
->data
.read_only
;
2827 if (type
->qualifier
.flags
.q
.constant
)
2828 var
->data
.read_only
= false;
2830 /* Never emit code to initialize a uniform.
2832 const glsl_type
*initializer_type
;
2833 if (!type
->qualifier
.flags
.q
.uniform
) {
2834 result
= do_assignment(initializer_instructions
, state
,
2837 type
->get_location());
2838 initializer_type
= result
->type
;
2840 initializer_type
= rhs
->type
;
2842 var
->constant_initializer
= rhs
->constant_expression_value();
2843 var
->data
.has_initializer
= true;
2845 /* If the declared variable is an unsized array, it must inherrit
2846 * its full type from the initializer. A declaration such as
2848 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2852 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2854 * The assignment generated in the if-statement (below) will also
2855 * automatically handle this case for non-uniforms.
2857 * If the declared variable is not an array, the types must
2858 * already match exactly. As a result, the type assignment
2859 * here can be done unconditionally. For non-uniforms the call
2860 * to do_assignment can change the type of the initializer (via
2861 * the implicit conversion rules). For uniforms the initializer
2862 * must be a constant expression, and the type of that expression
2863 * was validated above.
2865 var
->type
= initializer_type
;
2867 var
->data
.read_only
= temp
;
2875 * Do additional processing necessary for geometry shader input declarations
2876 * (this covers both interface blocks arrays and bare input variables).
2879 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
2880 YYLTYPE loc
, ir_variable
*var
)
2882 unsigned num_vertices
= 0;
2883 if (state
->gs_input_prim_type_specified
) {
2884 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
2887 /* Geometry shader input variables must be arrays. Caller should have
2888 * reported an error for this.
2890 if (!var
->type
->is_array()) {
2891 assert(state
->error
);
2893 /* To avoid cascading failures, short circuit the checks below. */
2897 if (var
->type
->is_unsized_array()) {
2898 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
2900 * All geometry shader input unsized array declarations will be
2901 * sized by an earlier input layout qualifier, when present, as per
2902 * the following table.
2904 * Followed by a table mapping each allowed input layout qualifier to
2905 * the corresponding input length.
2907 if (num_vertices
!= 0)
2908 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
2911 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
2912 * includes the following examples of compile-time errors:
2914 * // code sequence within one shader...
2915 * in vec4 Color1[]; // size unknown
2916 * ...Color1.length()...// illegal, length() unknown
2917 * in vec4 Color2[2]; // size is 2
2918 * ...Color1.length()...// illegal, Color1 still has no size
2919 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
2920 * layout(lines) in; // legal, input size is 2, matching
2921 * in vec4 Color4[3]; // illegal, contradicts layout
2924 * To detect the case illustrated by Color3, we verify that the size of
2925 * an explicitly-sized array matches the size of any previously declared
2926 * explicitly-sized array. To detect the case illustrated by Color4, we
2927 * verify that the size of an explicitly-sized array is consistent with
2928 * any previously declared input layout.
2930 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
2931 _mesa_glsl_error(&loc
, state
,
2932 "geometry shader input size contradicts previously"
2933 " declared layout (size is %u, but layout requires a"
2934 " size of %u)", var
->type
->length
, num_vertices
);
2935 } else if (state
->gs_input_size
!= 0 &&
2936 var
->type
->length
!= state
->gs_input_size
) {
2937 _mesa_glsl_error(&loc
, state
,
2938 "geometry shader input sizes are "
2939 "inconsistent (size is %u, but a previous "
2940 "declaration has size %u)",
2941 var
->type
->length
, state
->gs_input_size
);
2943 state
->gs_input_size
= var
->type
->length
;
2950 validate_identifier(const char *identifier
, YYLTYPE loc
,
2951 struct _mesa_glsl_parse_state
*state
)
2953 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2955 * "Identifiers starting with "gl_" are reserved for use by
2956 * OpenGL, and may not be declared in a shader as either a
2957 * variable or a function."
2959 if (strncmp(identifier
, "gl_", 3) == 0) {
2960 _mesa_glsl_error(&loc
, state
,
2961 "identifier `%s' uses reserved `gl_' prefix",
2963 } else if (strstr(identifier
, "__")) {
2964 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2967 * "In addition, all identifiers containing two
2968 * consecutive underscores (__) are reserved as
2969 * possible future keywords."
2971 * The intention is that names containing __ are reserved for internal
2972 * use by the implementation, and names prefixed with GL_ are reserved
2973 * for use by Khronos. Names simply containing __ are dangerous to use,
2974 * but should be allowed.
2976 * A future version of the GLSL specification will clarify this.
2978 _mesa_glsl_warning(&loc
, state
,
2979 "identifier `%s' uses reserved `__' string",
2986 ast_declarator_list::hir(exec_list
*instructions
,
2987 struct _mesa_glsl_parse_state
*state
)
2990 const struct glsl_type
*decl_type
;
2991 const char *type_name
= NULL
;
2992 ir_rvalue
*result
= NULL
;
2993 YYLTYPE loc
= this->get_location();
2995 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2997 * "To ensure that a particular output variable is invariant, it is
2998 * necessary to use the invariant qualifier. It can either be used to
2999 * qualify a previously declared variable as being invariant
3001 * invariant gl_Position; // make existing gl_Position be invariant"
3003 * In these cases the parser will set the 'invariant' flag in the declarator
3004 * list, and the type will be NULL.
3006 if (this->invariant
) {
3007 assert(this->type
== NULL
);
3009 if (state
->current_function
!= NULL
) {
3010 _mesa_glsl_error(& loc
, state
,
3011 "all uses of `invariant' keyword must be at global "
3015 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3016 assert(decl
->array_specifier
== NULL
);
3017 assert(decl
->initializer
== NULL
);
3019 ir_variable
*const earlier
=
3020 state
->symbols
->get_variable(decl
->identifier
);
3021 if (earlier
== NULL
) {
3022 _mesa_glsl_error(& loc
, state
,
3023 "undeclared variable `%s' cannot be marked "
3024 "invariant", decl
->identifier
);
3025 } else if ((state
->stage
== MESA_SHADER_VERTEX
)
3026 && (earlier
->data
.mode
!= ir_var_shader_out
)) {
3027 _mesa_glsl_error(& loc
, state
,
3028 "`%s' cannot be marked invariant, vertex shader "
3029 "outputs only", decl
->identifier
);
3030 } else if ((state
->stage
== MESA_SHADER_FRAGMENT
)
3031 && (earlier
->data
.mode
!= ir_var_shader_in
)) {
3032 _mesa_glsl_error(& loc
, state
,
3033 "`%s' cannot be marked invariant, fragment shader "
3034 "inputs only", decl
->identifier
);
3035 } else if (earlier
->data
.used
) {
3036 _mesa_glsl_error(& loc
, state
,
3037 "variable `%s' may not be redeclared "
3038 "`invariant' after being used",
3041 earlier
->data
.invariant
= true;
3045 /* Invariant redeclarations do not have r-values.
3050 assert(this->type
!= NULL
);
3051 assert(!this->invariant
);
3053 /* The type specifier may contain a structure definition. Process that
3054 * before any of the variable declarations.
3056 (void) this->type
->specifier
->hir(instructions
, state
);
3058 decl_type
= this->type
->glsl_type(& type_name
, state
);
3060 /* An offset-qualified atomic counter declaration sets the default
3061 * offset for the next declaration within the same atomic counter
3064 if (decl_type
&& decl_type
->contains_atomic()) {
3065 if (type
->qualifier
.flags
.q
.explicit_binding
&&
3066 type
->qualifier
.flags
.q
.explicit_offset
)
3067 state
->atomic_counter_offsets
[type
->qualifier
.binding
] =
3068 type
->qualifier
.offset
;
3071 if (this->declarations
.is_empty()) {
3072 /* If there is no structure involved in the program text, there are two
3073 * possible scenarios:
3075 * - The program text contained something like 'vec4;'. This is an
3076 * empty declaration. It is valid but weird. Emit a warning.
3078 * - The program text contained something like 'S;' and 'S' is not the
3079 * name of a known structure type. This is both invalid and weird.
3082 * - The program text contained something like 'mediump float;'
3083 * when the programmer probably meant 'precision mediump
3084 * float;' Emit a warning with a description of what they
3085 * probably meant to do.
3087 * Note that if decl_type is NULL and there is a structure involved,
3088 * there must have been some sort of error with the structure. In this
3089 * case we assume that an error was already generated on this line of
3090 * code for the structure. There is no need to generate an additional,
3093 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
3096 if (decl_type
== NULL
) {
3097 _mesa_glsl_error(&loc
, state
,
3098 "invalid type `%s' in empty declaration",
3100 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
3101 /* Empty atomic counter declarations are allowed and useful
3102 * to set the default offset qualifier.
3105 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3106 if (this->type
->specifier
->structure
!= NULL
) {
3107 _mesa_glsl_error(&loc
, state
,
3108 "precision qualifiers can't be applied "
3111 static const char *const precision_names
[] = {
3118 _mesa_glsl_warning(&loc
, state
,
3119 "empty declaration with precision qualifier, "
3120 "to set the default precision, use "
3121 "`precision %s %s;'",
3122 precision_names
[this->type
->qualifier
.precision
],
3125 } else if (this->type
->specifier
->structure
== NULL
) {
3126 _mesa_glsl_warning(&loc
, state
, "empty declaration");
3130 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3131 const struct glsl_type
*var_type
;
3134 /* FINISHME: Emit a warning if a variable declaration shadows a
3135 * FINISHME: declaration at a higher scope.
3138 if ((decl_type
== NULL
) || decl_type
->is_void()) {
3139 if (type_name
!= NULL
) {
3140 _mesa_glsl_error(& loc
, state
,
3141 "invalid type `%s' in declaration of `%s'",
3142 type_name
, decl
->identifier
);
3144 _mesa_glsl_error(& loc
, state
,
3145 "invalid type in declaration of `%s'",
3151 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
3154 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
3156 /* The 'varying in' and 'varying out' qualifiers can only be used with
3157 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
3160 if (this->type
->qualifier
.flags
.q
.varying
) {
3161 if (this->type
->qualifier
.flags
.q
.in
) {
3162 _mesa_glsl_error(& loc
, state
,
3163 "`varying in' qualifier in declaration of "
3164 "`%s' only valid for geometry shaders using "
3165 "ARB_geometry_shader4 or EXT_geometry_shader4",
3167 } else if (this->type
->qualifier
.flags
.q
.out
) {
3168 _mesa_glsl_error(& loc
, state
,
3169 "`varying out' qualifier in declaration of "
3170 "`%s' only valid for geometry shaders using "
3171 "ARB_geometry_shader4 or EXT_geometry_shader4",
3176 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
3178 * "Global variables can only use the qualifiers const,
3179 * attribute, uni form, or varying. Only one may be
3182 * Local variables can only use the qualifier const."
3184 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
3185 * any extension that adds the 'layout' keyword.
3187 if (!state
->is_version(130, 300)
3188 && !state
->has_explicit_attrib_location()
3189 && !state
->has_separate_shader_objects()
3190 && !state
->ARB_fragment_coord_conventions_enable
) {
3191 if (this->type
->qualifier
.flags
.q
.out
) {
3192 _mesa_glsl_error(& loc
, state
,
3193 "`out' qualifier in declaration of `%s' "
3194 "only valid for function parameters in %s",
3195 decl
->identifier
, state
->get_version_string());
3197 if (this->type
->qualifier
.flags
.q
.in
) {
3198 _mesa_glsl_error(& loc
, state
,
3199 "`in' qualifier in declaration of `%s' "
3200 "only valid for function parameters in %s",
3201 decl
->identifier
, state
->get_version_string());
3203 /* FINISHME: Test for other invalid qualifiers. */
3206 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
3209 if (this->type
->qualifier
.flags
.q
.invariant
) {
3210 if ((state
->stage
== MESA_SHADER_VERTEX
) &&
3211 var
->data
.mode
!= ir_var_shader_out
) {
3212 _mesa_glsl_error(& loc
, state
,
3213 "`%s' cannot be marked invariant, vertex shader "
3214 "outputs only", var
->name
);
3215 } else if ((state
->stage
== MESA_SHADER_FRAGMENT
) &&
3216 var
->data
.mode
!= ir_var_shader_in
) {
3217 /* FINISHME: Note that this doesn't work for invariant on
3218 * a function signature inval
3220 _mesa_glsl_error(& loc
, state
,
3221 "`%s' cannot be marked invariant, fragment shader "
3222 "inputs only", var
->name
);
3226 if (state
->current_function
!= NULL
) {
3227 const char *mode
= NULL
;
3228 const char *extra
= "";
3230 /* There is no need to check for 'inout' here because the parser will
3231 * only allow that in function parameter lists.
3233 if (this->type
->qualifier
.flags
.q
.attribute
) {
3235 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
3237 } else if (this->type
->qualifier
.flags
.q
.varying
) {
3239 } else if (this->type
->qualifier
.flags
.q
.in
) {
3241 extra
= " or in function parameter list";
3242 } else if (this->type
->qualifier
.flags
.q
.out
) {
3244 extra
= " or in function parameter list";
3248 _mesa_glsl_error(& loc
, state
,
3249 "%s variable `%s' must be declared at "
3251 mode
, var
->name
, extra
);
3253 } else if (var
->data
.mode
== ir_var_shader_in
) {
3254 var
->data
.read_only
= true;
3256 if (state
->stage
== MESA_SHADER_VERTEX
) {
3257 bool error_emitted
= false;
3259 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3261 * "Vertex shader inputs can only be float, floating-point
3262 * vectors, matrices, signed and unsigned integers and integer
3263 * vectors. Vertex shader inputs can also form arrays of these
3264 * types, but not structures."
3266 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3268 * "Vertex shader inputs can only be float, floating-point
3269 * vectors, matrices, signed and unsigned integers and integer
3270 * vectors. They cannot be arrays or structures."
3272 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3274 * "The attribute qualifier can be used only with float,
3275 * floating-point vectors, and matrices. Attribute variables
3276 * cannot be declared as arrays or structures."
3278 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3280 * "Vertex shader inputs can only be float, floating-point
3281 * vectors, matrices, signed and unsigned integers and integer
3282 * vectors. Vertex shader inputs cannot be arrays or
3285 const glsl_type
*check_type
= var
->type
;
3286 while (check_type
->is_array())
3287 check_type
= check_type
->element_type();
3289 switch (check_type
->base_type
) {
3290 case GLSL_TYPE_FLOAT
:
3292 case GLSL_TYPE_UINT
:
3294 if (state
->is_version(120, 300))
3298 _mesa_glsl_error(& loc
, state
,
3299 "vertex shader input / attribute cannot have "
3301 var
->type
->is_array() ? "array of " : "",
3303 error_emitted
= true;
3306 if (!error_emitted
&& var
->type
->is_array() &&
3307 !state
->check_version(150, 0, &loc
,
3308 "vertex shader input / attribute "
3309 "cannot have array type")) {
3310 error_emitted
= true;
3312 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
3313 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3315 * Geometry shader input variables get the per-vertex values
3316 * written out by vertex shader output variables of the same
3317 * names. Since a geometry shader operates on a set of
3318 * vertices, each input varying variable (or input block, see
3319 * interface blocks below) needs to be declared as an array.
3321 if (!var
->type
->is_array()) {
3322 _mesa_glsl_error(&loc
, state
,
3323 "geometry shader inputs must be arrays");
3326 handle_geometry_shader_input_decl(state
, loc
, var
);
3330 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3331 * so must integer vertex outputs.
3333 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3334 * "Fragment shader inputs that are signed or unsigned integers or
3335 * integer vectors must be qualified with the interpolation qualifier
3338 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3339 * "Fragment shader inputs that are, or contain, signed or unsigned
3340 * integers or integer vectors must be qualified with the
3341 * interpolation qualifier flat."
3343 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3344 * "Vertex shader outputs that are, or contain, signed or unsigned
3345 * integers or integer vectors must be qualified with the
3346 * interpolation qualifier flat."
3348 * Note that prior to GLSL 1.50, this requirement applied to vertex
3349 * outputs rather than fragment inputs. That creates problems in the
3350 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3351 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3352 * apply the restriction to both vertex outputs and fragment inputs.
3354 * Note also that the desktop GLSL specs are missing the text "or
3355 * contain"; this is presumably an oversight, since there is no
3356 * reasonable way to interpolate a fragment shader input that contains
3359 if (state
->is_version(130, 300) &&
3360 var
->type
->contains_integer() &&
3361 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
3362 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
3363 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
3364 && state
->es_shader
))) {
3365 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
3366 "vertex output" : "fragment input";
3367 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
3368 "an integer, then it must be qualified with 'flat'",
3373 /* Interpolation qualifiers cannot be applied to 'centroid' and
3374 * 'centroid varying'.
3376 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3377 * "interpolation qualifiers may only precede the qualifiers in,
3378 * centroid in, out, or centroid out in a declaration. They do not apply
3379 * to the deprecated storage qualifiers varying or centroid varying."
3381 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3383 if (state
->is_version(130, 0)
3384 && this->type
->qualifier
.has_interpolation()
3385 && this->type
->qualifier
.flags
.q
.varying
) {
3387 const char *i
= this->type
->qualifier
.interpolation_string();
3390 if (this->type
->qualifier
.flags
.q
.centroid
)
3391 s
= "centroid varying";
3395 _mesa_glsl_error(&loc
, state
,
3396 "qualifier '%s' cannot be applied to the "
3397 "deprecated storage qualifier '%s'", i
, s
);
3401 /* Interpolation qualifiers can only apply to vertex shader outputs and
3402 * fragment shader inputs.
3404 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3405 * "Outputs from a vertex shader (out) and inputs to a fragment
3406 * shader (in) can be further qualified with one or more of these
3407 * interpolation qualifiers"
3409 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
3410 * "These interpolation qualifiers may only precede the qualifiers
3411 * in, centroid in, out, or centroid out in a declaration. They do
3412 * not apply to inputs into a vertex shader or outputs from a
3415 if (state
->is_version(130, 300)
3416 && this->type
->qualifier
.has_interpolation()) {
3418 const char *i
= this->type
->qualifier
.interpolation_string();
3421 switch (state
->stage
) {
3422 case MESA_SHADER_VERTEX
:
3423 if (this->type
->qualifier
.flags
.q
.in
) {
3424 _mesa_glsl_error(&loc
, state
,
3425 "qualifier '%s' cannot be applied to vertex "
3426 "shader inputs", i
);
3429 case MESA_SHADER_FRAGMENT
:
3430 if (this->type
->qualifier
.flags
.q
.out
) {
3431 _mesa_glsl_error(&loc
, state
,
3432 "qualifier '%s' cannot be applied to fragment "
3433 "shader outputs", i
);
3442 /* From section 4.3.4 of the GLSL 1.30 spec:
3443 * "It is an error to use centroid in in a vertex shader."
3445 * From section 4.3.4 of the GLSL ES 3.00 spec:
3446 * "It is an error to use centroid in or interpolation qualifiers in
3447 * a vertex shader input."
3449 if (state
->is_version(130, 300)
3450 && this->type
->qualifier
.flags
.q
.centroid
3451 && this->type
->qualifier
.flags
.q
.in
3452 && state
->stage
== MESA_SHADER_VERTEX
) {
3454 _mesa_glsl_error(&loc
, state
,
3455 "'centroid in' cannot be used in a vertex shader");
3458 if (state
->stage
== MESA_SHADER_VERTEX
3459 && this->type
->qualifier
.flags
.q
.sample
3460 && this->type
->qualifier
.flags
.q
.in
) {
3462 _mesa_glsl_error(&loc
, state
,
3463 "'sample in' cannot be used in a vertex shader");
3466 /* Section 4.3.6 of the GLSL 1.30 specification states:
3467 * "It is an error to use centroid out in a fragment shader."
3469 * The GL_ARB_shading_language_420pack extension specification states:
3470 * "It is an error to use auxiliary storage qualifiers or interpolation
3471 * qualifiers on an output in a fragment shader."
3473 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
3474 this->type
->qualifier
.flags
.q
.out
&&
3475 this->type
->qualifier
.has_auxiliary_storage()) {
3476 _mesa_glsl_error(&loc
, state
,
3477 "auxiliary storage qualifiers cannot be used on "
3478 "fragment shader outputs");
3481 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
3483 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3484 state
->check_precision_qualifiers_allowed(&loc
);
3488 /* Precision qualifiers apply to floating point, integer and sampler
3491 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3492 * "Any floating point or any integer declaration can have the type
3493 * preceded by one of these precision qualifiers [...] Literal
3494 * constants do not have precision qualifiers. Neither do Boolean
3497 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3500 * "Precision qualifiers are added for code portability with OpenGL
3501 * ES, not for functionality. They have the same syntax as in OpenGL
3504 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3506 * "uniform lowp sampler2D sampler;
3509 * lowp vec4 col = texture2D (sampler, coord);
3510 * // texture2D returns lowp"
3512 * From this, we infer that GLSL 1.30 (and later) should allow precision
3513 * qualifiers on sampler types just like float and integer types.
3515 if (this->type
->qualifier
.precision
!= ast_precision_none
3516 && !var
->type
->is_float()
3517 && !var
->type
->is_integer()
3518 && !var
->type
->is_record()
3519 && !var
->type
->is_sampler()
3520 && !(var
->type
->is_array()
3521 && (var
->type
->fields
.array
->is_float()
3522 || var
->type
->fields
.array
->is_integer()))) {
3524 _mesa_glsl_error(&loc
, state
,
3525 "precision qualifiers apply only to floating point"
3526 ", integer and sampler types");
3529 /* From section 4.1.7 of the GLSL 4.40 spec:
3531 * "[Opaque types] can only be declared as function
3532 * parameters or uniform-qualified variables."
3534 if (var_type
->contains_opaque() &&
3535 !this->type
->qualifier
.flags
.q
.uniform
) {
3536 _mesa_glsl_error(&loc
, state
,
3537 "opaque variables must be declared uniform");
3540 /* Process the initializer and add its instructions to a temporary
3541 * list. This list will be added to the instruction stream (below) after
3542 * the declaration is added. This is done because in some cases (such as
3543 * redeclarations) the declaration may not actually be added to the
3544 * instruction stream.
3546 exec_list initializer_instructions
;
3547 ir_variable
*earlier
=
3548 get_variable_being_redeclared(var
, decl
->get_location(), state
,
3549 false /* allow_all_redeclarations */);
3550 if (earlier
!= NULL
) {
3551 if (strncmp(var
->name
, "gl_", 3) == 0 &&
3552 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
3553 _mesa_glsl_error(&loc
, state
,
3554 "`%s' has already been redeclared using "
3555 "gl_PerVertex", var
->name
);
3557 earlier
->data
.how_declared
= ir_var_declared_normally
;
3560 if (decl
->initializer
!= NULL
) {
3561 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3563 &initializer_instructions
, state
);
3566 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3568 * "It is an error to write to a const variable outside of
3569 * its declaration, so they must be initialized when
3572 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3573 _mesa_glsl_error(& loc
, state
,
3574 "const declaration of `%s' must be initialized",
3578 if (state
->es_shader
) {
3579 const glsl_type
*const t
= (earlier
== NULL
)
3580 ? var
->type
: earlier
->type
;
3582 if (t
->is_unsized_array())
3583 /* Section 10.17 of the GLSL ES 1.00 specification states that
3584 * unsized array declarations have been removed from the language.
3585 * Arrays that are sized using an initializer are still explicitly
3586 * sized. However, GLSL ES 1.00 does not allow array
3587 * initializers. That is only allowed in GLSL ES 3.00.
3589 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
3591 * "An array type can also be formed without specifying a size
3592 * if the definition includes an initializer:
3594 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
3595 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
3600 _mesa_glsl_error(& loc
, state
,
3601 "unsized array declarations are not allowed in "
3605 /* If the declaration is not a redeclaration, there are a few additional
3606 * semantic checks that must be applied. In addition, variable that was
3607 * created for the declaration should be added to the IR stream.
3609 if (earlier
== NULL
) {
3610 validate_identifier(decl
->identifier
, loc
, state
);
3612 /* Add the variable to the symbol table. Note that the initializer's
3613 * IR was already processed earlier (though it hasn't been emitted
3614 * yet), without the variable in scope.
3616 * This differs from most C-like languages, but it follows the GLSL
3617 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3620 * "Within a declaration, the scope of a name starts immediately
3621 * after the initializer if present or immediately after the name
3622 * being declared if not."
3624 if (!state
->symbols
->add_variable(var
)) {
3625 YYLTYPE loc
= this->get_location();
3626 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3627 "current scope", decl
->identifier
);
3631 /* Push the variable declaration to the top. It means that all the
3632 * variable declarations will appear in a funny last-to-first order,
3633 * but otherwise we run into trouble if a function is prototyped, a
3634 * global var is decled, then the function is defined with usage of
3635 * the global var. See glslparsertest's CorrectModule.frag.
3637 instructions
->push_head(var
);
3640 instructions
->append_list(&initializer_instructions
);
3644 /* Generally, variable declarations do not have r-values. However,
3645 * one is used for the declaration in
3647 * while (bool b = some_condition()) {
3651 * so we return the rvalue from the last seen declaration here.
3658 ast_parameter_declarator::hir(exec_list
*instructions
,
3659 struct _mesa_glsl_parse_state
*state
)
3662 const struct glsl_type
*type
;
3663 const char *name
= NULL
;
3664 YYLTYPE loc
= this->get_location();
3666 type
= this->type
->glsl_type(& name
, state
);
3670 _mesa_glsl_error(& loc
, state
,
3671 "invalid type `%s' in declaration of `%s'",
3672 name
, this->identifier
);
3674 _mesa_glsl_error(& loc
, state
,
3675 "invalid type in declaration of `%s'",
3679 type
= glsl_type::error_type
;
3682 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3684 * "Functions that accept no input arguments need not use void in the
3685 * argument list because prototypes (or definitions) are required and
3686 * therefore there is no ambiguity when an empty argument list "( )" is
3687 * declared. The idiom "(void)" as a parameter list is provided for
3690 * Placing this check here prevents a void parameter being set up
3691 * for a function, which avoids tripping up checks for main taking
3692 * parameters and lookups of an unnamed symbol.
3694 if (type
->is_void()) {
3695 if (this->identifier
!= NULL
)
3696 _mesa_glsl_error(& loc
, state
,
3697 "named parameter cannot have type `void'");
3703 if (formal_parameter
&& (this->identifier
== NULL
)) {
3704 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3708 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3709 * call already handled the "vec4[..] foo" case.
3711 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
3713 if (!type
->is_error() && type
->is_unsized_array()) {
3714 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3716 type
= glsl_type::error_type
;
3720 ir_variable
*var
= new(ctx
)
3721 ir_variable(type
, this->identifier
, ir_var_function_in
);
3723 /* Apply any specified qualifiers to the parameter declaration. Note that
3724 * for function parameters the default mode is 'in'.
3726 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3729 /* From section 4.1.7 of the GLSL 4.40 spec:
3731 * "Opaque variables cannot be treated as l-values; hence cannot
3732 * be used as out or inout function parameters, nor can they be
3735 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
3736 && type
->contains_opaque()) {
3737 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
3738 "contain opaque variables");
3739 type
= glsl_type::error_type
;
3742 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3744 * "When calling a function, expressions that do not evaluate to
3745 * l-values cannot be passed to parameters declared as out or inout."
3747 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3749 * "Other binary or unary expressions, non-dereferenced arrays,
3750 * function names, swizzles with repeated fields, and constants
3751 * cannot be l-values."
3753 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3754 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3756 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
3758 && !state
->check_version(120, 100, &loc
,
3759 "arrays cannot be out or inout parameters")) {
3760 type
= glsl_type::error_type
;
3763 instructions
->push_tail(var
);
3765 /* Parameter declarations do not have r-values.
3772 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3774 exec_list
*ir_parameters
,
3775 _mesa_glsl_parse_state
*state
)
3777 ast_parameter_declarator
*void_param
= NULL
;
3780 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3781 param
->formal_parameter
= formal
;
3782 param
->hir(ir_parameters
, state
);
3790 if ((void_param
!= NULL
) && (count
> 1)) {
3791 YYLTYPE loc
= void_param
->get_location();
3793 _mesa_glsl_error(& loc
, state
,
3794 "`void' parameter must be only parameter");
3800 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3802 /* IR invariants disallow function declarations or definitions
3803 * nested within other function definitions. But there is no
3804 * requirement about the relative order of function declarations
3805 * and definitions with respect to one another. So simply insert
3806 * the new ir_function block at the end of the toplevel instruction
3809 state
->toplevel_ir
->push_tail(f
);
3814 ast_function::hir(exec_list
*instructions
,
3815 struct _mesa_glsl_parse_state
*state
)
3818 ir_function
*f
= NULL
;
3819 ir_function_signature
*sig
= NULL
;
3820 exec_list hir_parameters
;
3822 const char *const name
= identifier
;
3824 /* New functions are always added to the top-level IR instruction stream,
3825 * so this instruction list pointer is ignored. See also emit_function
3828 (void) instructions
;
3830 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3832 * "Function declarations (prototypes) cannot occur inside of functions;
3833 * they must be at global scope, or for the built-in functions, outside
3834 * the global scope."
3836 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3838 * "User defined functions may only be defined within the global scope."
3840 * Note that this language does not appear in GLSL 1.10.
3842 if ((state
->current_function
!= NULL
) &&
3843 state
->is_version(120, 100)) {
3844 YYLTYPE loc
= this->get_location();
3845 _mesa_glsl_error(&loc
, state
,
3846 "declaration of function `%s' not allowed within "
3847 "function body", name
);
3850 validate_identifier(name
, this->get_location(), state
);
3852 /* Convert the list of function parameters to HIR now so that they can be
3853 * used below to compare this function's signature with previously seen
3854 * signatures for functions with the same name.
3856 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3858 & hir_parameters
, state
);
3860 const char *return_type_name
;
3861 const glsl_type
*return_type
=
3862 this->return_type
->glsl_type(& return_type_name
, state
);
3865 YYLTYPE loc
= this->get_location();
3866 _mesa_glsl_error(&loc
, state
,
3867 "function `%s' has undeclared return type `%s'",
3868 name
, return_type_name
);
3869 return_type
= glsl_type::error_type
;
3872 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3873 * "No qualifier is allowed on the return type of a function."
3875 if (this->return_type
->has_qualifiers()) {
3876 YYLTYPE loc
= this->get_location();
3877 _mesa_glsl_error(& loc
, state
,
3878 "function `%s' return type has qualifiers", name
);
3881 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
3883 * "Arrays are allowed as arguments and as the return type. In both
3884 * cases, the array must be explicitly sized."
3886 if (return_type
->is_unsized_array()) {
3887 YYLTYPE loc
= this->get_location();
3888 _mesa_glsl_error(& loc
, state
,
3889 "function `%s' return type array must be explicitly "
3893 /* From section 4.1.7 of the GLSL 4.40 spec:
3895 * "[Opaque types] can only be declared as function parameters
3896 * or uniform-qualified variables."
3898 if (return_type
->contains_opaque()) {
3899 YYLTYPE loc
= this->get_location();
3900 _mesa_glsl_error(&loc
, state
,
3901 "function `%s' return type can't contain an opaque type",
3905 /* Verify that this function's signature either doesn't match a previously
3906 * seen signature for a function with the same name, or, if a match is found,
3907 * that the previously seen signature does not have an associated definition.
3909 f
= state
->symbols
->get_function(name
);
3910 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3911 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
3913 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3914 if (badvar
!= NULL
) {
3915 YYLTYPE loc
= this->get_location();
3917 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3918 "qualifiers don't match prototype", name
, badvar
);
3921 if (sig
->return_type
!= return_type
) {
3922 YYLTYPE loc
= this->get_location();
3924 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3925 "match prototype", name
);
3928 if (sig
->is_defined
) {
3929 if (is_definition
) {
3930 YYLTYPE loc
= this->get_location();
3931 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3933 /* We just encountered a prototype that exactly matches a
3934 * function that's already been defined. This is redundant,
3935 * and we should ignore it.
3942 f
= new(ctx
) ir_function(name
);
3943 if (!state
->symbols
->add_function(f
)) {
3944 /* This function name shadows a non-function use of the same name. */
3945 YYLTYPE loc
= this->get_location();
3947 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3948 "non-function", name
);
3952 emit_function(state
, f
);
3955 /* Verify the return type of main() */
3956 if (strcmp(name
, "main") == 0) {
3957 if (! return_type
->is_void()) {
3958 YYLTYPE loc
= this->get_location();
3960 _mesa_glsl_error(& loc
, state
, "main() must return void");
3963 if (!hir_parameters
.is_empty()) {
3964 YYLTYPE loc
= this->get_location();
3966 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3970 /* Finish storing the information about this new function in its signature.
3973 sig
= new(ctx
) ir_function_signature(return_type
);
3974 f
->add_signature(sig
);
3977 sig
->replace_parameters(&hir_parameters
);
3980 /* Function declarations (prototypes) do not have r-values.
3987 ast_function_definition::hir(exec_list
*instructions
,
3988 struct _mesa_glsl_parse_state
*state
)
3990 prototype
->is_definition
= true;
3991 prototype
->hir(instructions
, state
);
3993 ir_function_signature
*signature
= prototype
->signature
;
3994 if (signature
== NULL
)
3997 assert(state
->current_function
== NULL
);
3998 state
->current_function
= signature
;
3999 state
->found_return
= false;
4001 /* Duplicate parameters declared in the prototype as concrete variables.
4002 * Add these to the symbol table.
4004 state
->symbols
->push_scope();
4005 foreach_list(n
, &signature
->parameters
) {
4006 ir_variable
*const var
= ((ir_instruction
*) n
)->as_variable();
4008 assert(var
!= NULL
);
4010 /* The only way a parameter would "exist" is if two parameters have
4013 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
4014 YYLTYPE loc
= this->get_location();
4016 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
4018 state
->symbols
->add_variable(var
);
4022 /* Convert the body of the function to HIR. */
4023 this->body
->hir(&signature
->body
, state
);
4024 signature
->is_defined
= true;
4026 state
->symbols
->pop_scope();
4028 assert(state
->current_function
== signature
);
4029 state
->current_function
= NULL
;
4031 if (!signature
->return_type
->is_void() && !state
->found_return
) {
4032 YYLTYPE loc
= this->get_location();
4033 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
4034 "%s, but no return statement",
4035 signature
->function_name(),
4036 signature
->return_type
->name
);
4039 /* Function definitions do not have r-values.
4046 ast_jump_statement::hir(exec_list
*instructions
,
4047 struct _mesa_glsl_parse_state
*state
)
4054 assert(state
->current_function
);
4056 if (opt_return_value
) {
4057 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
4059 /* The value of the return type can be NULL if the shader says
4060 * 'return foo();' and foo() is a function that returns void.
4062 * NOTE: The GLSL spec doesn't say that this is an error. The type
4063 * of the return value is void. If the return type of the function is
4064 * also void, then this should compile without error. Seriously.
4066 const glsl_type
*const ret_type
=
4067 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
4069 /* Implicit conversions are not allowed for return values prior to
4070 * ARB_shading_language_420pack.
4072 if (state
->current_function
->return_type
!= ret_type
) {
4073 YYLTYPE loc
= this->get_location();
4075 if (state
->ARB_shading_language_420pack_enable
) {
4076 if (!apply_implicit_conversion(state
->current_function
->return_type
,
4078 _mesa_glsl_error(& loc
, state
,
4079 "could not implicitly convert return value "
4080 "to %s, in function `%s'",
4081 state
->current_function
->return_type
->name
,
4082 state
->current_function
->function_name());
4085 _mesa_glsl_error(& loc
, state
,
4086 "`return' with wrong type %s, in function `%s' "
4089 state
->current_function
->function_name(),
4090 state
->current_function
->return_type
->name
);
4092 } else if (state
->current_function
->return_type
->base_type
==
4094 YYLTYPE loc
= this->get_location();
4096 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
4097 * specs add a clarification:
4099 * "A void function can only use return without a return argument, even if
4100 * the return argument has void type. Return statements only accept values:
4103 * void func2() { return func1(); } // illegal return statement"
4105 _mesa_glsl_error(& loc
, state
,
4106 "void functions can only use `return' without a "
4110 inst
= new(ctx
) ir_return(ret
);
4112 if (state
->current_function
->return_type
->base_type
!=
4114 YYLTYPE loc
= this->get_location();
4116 _mesa_glsl_error(& loc
, state
,
4117 "`return' with no value, in function %s returning "
4119 state
->current_function
->function_name());
4121 inst
= new(ctx
) ir_return
;
4124 state
->found_return
= true;
4125 instructions
->push_tail(inst
);
4130 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
4131 YYLTYPE loc
= this->get_location();
4133 _mesa_glsl_error(& loc
, state
,
4134 "`discard' may only appear in a fragment shader");
4136 instructions
->push_tail(new(ctx
) ir_discard
);
4141 if (mode
== ast_continue
&&
4142 state
->loop_nesting_ast
== NULL
) {
4143 YYLTYPE loc
= this->get_location();
4145 _mesa_glsl_error(& loc
, state
,
4146 "continue may only appear in a loop");
4147 } else if (mode
== ast_break
&&
4148 state
->loop_nesting_ast
== NULL
&&
4149 state
->switch_state
.switch_nesting_ast
== NULL
) {
4150 YYLTYPE loc
= this->get_location();
4152 _mesa_glsl_error(& loc
, state
,
4153 "break may only appear in a loop or a switch");
4155 /* For a loop, inline the for loop expression again, since we don't
4156 * know where near the end of the loop body the normal copy of it is
4157 * going to be placed. Same goes for the condition for a do-while
4160 if (state
->loop_nesting_ast
!= NULL
&&
4161 mode
== ast_continue
) {
4162 if (state
->loop_nesting_ast
->rest_expression
) {
4163 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
4166 if (state
->loop_nesting_ast
->mode
==
4167 ast_iteration_statement::ast_do_while
) {
4168 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
4172 if (state
->switch_state
.is_switch_innermost
&&
4173 mode
== ast_break
) {
4174 /* Force break out of switch by setting is_break switch state.
4176 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
4177 ir_dereference_variable
*const deref_is_break_var
=
4178 new(ctx
) ir_dereference_variable(is_break_var
);
4179 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
4180 ir_assignment
*const set_break_var
=
4181 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
4183 instructions
->push_tail(set_break_var
);
4186 ir_loop_jump
*const jump
=
4187 new(ctx
) ir_loop_jump((mode
== ast_break
)
4188 ? ir_loop_jump::jump_break
4189 : ir_loop_jump::jump_continue
);
4190 instructions
->push_tail(jump
);
4197 /* Jump instructions do not have r-values.
4204 ast_selection_statement::hir(exec_list
*instructions
,
4205 struct _mesa_glsl_parse_state
*state
)
4209 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
4211 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
4213 * "Any expression whose type evaluates to a Boolean can be used as the
4214 * conditional expression bool-expression. Vector types are not accepted
4215 * as the expression to if."
4217 * The checks are separated so that higher quality diagnostics can be
4218 * generated for cases where both rules are violated.
4220 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
4221 YYLTYPE loc
= this->condition
->get_location();
4223 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
4227 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
4229 if (then_statement
!= NULL
) {
4230 state
->symbols
->push_scope();
4231 then_statement
->hir(& stmt
->then_instructions
, state
);
4232 state
->symbols
->pop_scope();
4235 if (else_statement
!= NULL
) {
4236 state
->symbols
->push_scope();
4237 else_statement
->hir(& stmt
->else_instructions
, state
);
4238 state
->symbols
->pop_scope();
4241 instructions
->push_tail(stmt
);
4243 /* if-statements do not have r-values.
4250 ast_switch_statement::hir(exec_list
*instructions
,
4251 struct _mesa_glsl_parse_state
*state
)
4255 ir_rvalue
*const test_expression
=
4256 this->test_expression
->hir(instructions
, state
);
4258 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
4260 * "The type of init-expression in a switch statement must be a
4263 if (!test_expression
->type
->is_scalar() ||
4264 !test_expression
->type
->is_integer()) {
4265 YYLTYPE loc
= this->test_expression
->get_location();
4267 _mesa_glsl_error(& loc
,
4269 "switch-statement expression must be scalar "
4273 /* Track the switch-statement nesting in a stack-like manner.
4275 struct glsl_switch_state saved
= state
->switch_state
;
4277 state
->switch_state
.is_switch_innermost
= true;
4278 state
->switch_state
.switch_nesting_ast
= this;
4279 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
4280 hash_table_pointer_compare
);
4281 state
->switch_state
.previous_default
= NULL
;
4283 /* Initalize is_fallthru state to false.
4285 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
4286 state
->switch_state
.is_fallthru_var
=
4287 new(ctx
) ir_variable(glsl_type::bool_type
,
4288 "switch_is_fallthru_tmp",
4290 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
4292 ir_dereference_variable
*deref_is_fallthru_var
=
4293 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4294 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
4297 /* Initalize is_break state to false.
4299 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
4300 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
4301 "switch_is_break_tmp",
4303 instructions
->push_tail(state
->switch_state
.is_break_var
);
4305 ir_dereference_variable
*deref_is_break_var
=
4306 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4307 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
4310 /* Cache test expression.
4312 test_to_hir(instructions
, state
);
4314 /* Emit code for body of switch stmt.
4316 body
->hir(instructions
, state
);
4318 hash_table_dtor(state
->switch_state
.labels_ht
);
4320 state
->switch_state
= saved
;
4322 /* Switch statements do not have r-values. */
4328 ast_switch_statement::test_to_hir(exec_list
*instructions
,
4329 struct _mesa_glsl_parse_state
*state
)
4333 /* Cache value of test expression. */
4334 ir_rvalue
*const test_val
=
4335 test_expression
->hir(instructions
,
4338 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
4341 ir_dereference_variable
*deref_test_var
=
4342 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4344 instructions
->push_tail(state
->switch_state
.test_var
);
4345 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
4350 ast_switch_body::hir(exec_list
*instructions
,
4351 struct _mesa_glsl_parse_state
*state
)
4354 stmts
->hir(instructions
, state
);
4356 /* Switch bodies do not have r-values. */
4361 ast_case_statement_list::hir(exec_list
*instructions
,
4362 struct _mesa_glsl_parse_state
*state
)
4364 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
4365 case_stmt
->hir(instructions
, state
);
4367 /* Case statements do not have r-values. */
4372 ast_case_statement::hir(exec_list
*instructions
,
4373 struct _mesa_glsl_parse_state
*state
)
4375 labels
->hir(instructions
, state
);
4377 /* Conditionally set fallthru state based on break state. */
4378 ir_constant
*const false_val
= new(state
) ir_constant(false);
4379 ir_dereference_variable
*const deref_is_fallthru_var
=
4380 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4381 ir_dereference_variable
*const deref_is_break_var
=
4382 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4383 ir_assignment
*const reset_fallthru_on_break
=
4384 new(state
) ir_assignment(deref_is_fallthru_var
,
4386 deref_is_break_var
);
4387 instructions
->push_tail(reset_fallthru_on_break
);
4389 /* Guard case statements depending on fallthru state. */
4390 ir_dereference_variable
*const deref_fallthru_guard
=
4391 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4392 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
4394 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
4395 stmt
->hir(& test_fallthru
->then_instructions
, state
);
4397 instructions
->push_tail(test_fallthru
);
4399 /* Case statements do not have r-values. */
4405 ast_case_label_list::hir(exec_list
*instructions
,
4406 struct _mesa_glsl_parse_state
*state
)
4408 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
4409 label
->hir(instructions
, state
);
4411 /* Case labels do not have r-values. */
4416 ast_case_label::hir(exec_list
*instructions
,
4417 struct _mesa_glsl_parse_state
*state
)
4421 ir_dereference_variable
*deref_fallthru_var
=
4422 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4424 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
4426 /* If not default case, ... */
4427 if (this->test_value
!= NULL
) {
4428 /* Conditionally set fallthru state based on
4429 * comparison of cached test expression value to case label.
4431 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
4432 ir_constant
*label_const
= label_rval
->constant_expression_value();
4435 YYLTYPE loc
= this->test_value
->get_location();
4437 _mesa_glsl_error(& loc
, state
,
4438 "switch statement case label must be a "
4439 "constant expression");
4441 /* Stuff a dummy value in to allow processing to continue. */
4442 label_const
= new(ctx
) ir_constant(0);
4444 ast_expression
*previous_label
= (ast_expression
*)
4445 hash_table_find(state
->switch_state
.labels_ht
,
4446 (void *)(uintptr_t)label_const
->value
.u
[0]);
4448 if (previous_label
) {
4449 YYLTYPE loc
= this->test_value
->get_location();
4450 _mesa_glsl_error(& loc
, state
,
4451 "duplicate case value");
4453 loc
= previous_label
->get_location();
4454 _mesa_glsl_error(& loc
, state
,
4455 "this is the previous case label");
4457 hash_table_insert(state
->switch_state
.labels_ht
,
4459 (void *)(uintptr_t)label_const
->value
.u
[0]);
4463 ir_dereference_variable
*deref_test_var
=
4464 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4466 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4470 ir_assignment
*set_fallthru_on_test
=
4471 new(ctx
) ir_assignment(deref_fallthru_var
,
4475 instructions
->push_tail(set_fallthru_on_test
);
4476 } else { /* default case */
4477 if (state
->switch_state
.previous_default
) {
4478 YYLTYPE loc
= this->get_location();
4479 _mesa_glsl_error(& loc
, state
,
4480 "multiple default labels in one switch");
4482 loc
= state
->switch_state
.previous_default
->get_location();
4483 _mesa_glsl_error(& loc
, state
,
4484 "this is the first default label");
4486 state
->switch_state
.previous_default
= this;
4488 /* Set falltrhu state. */
4489 ir_assignment
*set_fallthru
=
4490 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
4492 instructions
->push_tail(set_fallthru
);
4495 /* Case statements do not have r-values. */
4500 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
4501 struct _mesa_glsl_parse_state
*state
)
4505 if (condition
!= NULL
) {
4506 ir_rvalue
*const cond
=
4507 condition
->hir(instructions
, state
);
4510 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
4511 YYLTYPE loc
= condition
->get_location();
4513 _mesa_glsl_error(& loc
, state
,
4514 "loop condition must be scalar boolean");
4516 /* As the first code in the loop body, generate a block that looks
4517 * like 'if (!condition) break;' as the loop termination condition.
4519 ir_rvalue
*const not_cond
=
4520 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
4522 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
4524 ir_jump
*const break_stmt
=
4525 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4527 if_stmt
->then_instructions
.push_tail(break_stmt
);
4528 instructions
->push_tail(if_stmt
);
4535 ast_iteration_statement::hir(exec_list
*instructions
,
4536 struct _mesa_glsl_parse_state
*state
)
4540 /* For-loops and while-loops start a new scope, but do-while loops do not.
4542 if (mode
!= ast_do_while
)
4543 state
->symbols
->push_scope();
4545 if (init_statement
!= NULL
)
4546 init_statement
->hir(instructions
, state
);
4548 ir_loop
*const stmt
= new(ctx
) ir_loop();
4549 instructions
->push_tail(stmt
);
4551 /* Track the current loop nesting. */
4552 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
4554 state
->loop_nesting_ast
= this;
4556 /* Likewise, indicate that following code is closest to a loop,
4557 * NOT closest to a switch.
4559 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
4560 state
->switch_state
.is_switch_innermost
= false;
4562 if (mode
!= ast_do_while
)
4563 condition_to_hir(&stmt
->body_instructions
, state
);
4566 body
->hir(& stmt
->body_instructions
, state
);
4568 if (rest_expression
!= NULL
)
4569 rest_expression
->hir(& stmt
->body_instructions
, state
);
4571 if (mode
== ast_do_while
)
4572 condition_to_hir(&stmt
->body_instructions
, state
);
4574 if (mode
!= ast_do_while
)
4575 state
->symbols
->pop_scope();
4577 /* Restore previous nesting before returning. */
4578 state
->loop_nesting_ast
= nesting_ast
;
4579 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
4581 /* Loops do not have r-values.
4588 * Determine if the given type is valid for establishing a default precision
4591 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4593 * "The precision statement
4595 * precision precision-qualifier type;
4597 * can be used to establish a default precision qualifier. The type field
4598 * can be either int or float or any of the sampler types, and the
4599 * precision-qualifier can be lowp, mediump, or highp."
4601 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4602 * qualifiers on sampler types, but this seems like an oversight (since the
4603 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4604 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4608 is_valid_default_precision_type(const struct glsl_type
*const type
)
4613 switch (type
->base_type
) {
4615 case GLSL_TYPE_FLOAT
:
4616 /* "int" and "float" are valid, but vectors and matrices are not. */
4617 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4618 case GLSL_TYPE_SAMPLER
:
4627 ast_type_specifier::hir(exec_list
*instructions
,
4628 struct _mesa_glsl_parse_state
*state
)
4630 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
4633 YYLTYPE loc
= this->get_location();
4635 /* If this is a precision statement, check that the type to which it is
4636 * applied is either float or int.
4638 * From section 4.5.3 of the GLSL 1.30 spec:
4639 * "The precision statement
4640 * precision precision-qualifier type;
4641 * can be used to establish a default precision qualifier. The type
4642 * field can be either int or float [...]. Any other types or
4643 * qualifiers will result in an error.
4645 if (this->default_precision
!= ast_precision_none
) {
4646 if (!state
->check_precision_qualifiers_allowed(&loc
))
4649 if (this->structure
!= NULL
) {
4650 _mesa_glsl_error(&loc
, state
,
4651 "precision qualifiers do not apply to structures");
4655 if (this->array_specifier
!= NULL
) {
4656 _mesa_glsl_error(&loc
, state
,
4657 "default precision statements do not apply to "
4662 const struct glsl_type
*const type
=
4663 state
->symbols
->get_type(this->type_name
);
4664 if (!is_valid_default_precision_type(type
)) {
4665 _mesa_glsl_error(&loc
, state
,
4666 "default precision statements apply only to "
4667 "float, int, and sampler types");
4671 if (type
->base_type
== GLSL_TYPE_FLOAT
4673 && state
->stage
== MESA_SHADER_FRAGMENT
) {
4674 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
4677 * "The fragment language has no default precision qualifier for
4678 * floating point types."
4680 * As a result, we have to track whether or not default precision has
4681 * been specified for float in GLSL ES fragment shaders.
4683 * Earlier in that same section, the spec says:
4685 * "Non-precision qualified declarations will use the precision
4686 * qualifier specified in the most recent precision statement
4687 * that is still in scope. The precision statement has the same
4688 * scoping rules as variable declarations. If it is declared
4689 * inside a compound statement, its effect stops at the end of
4690 * the innermost statement it was declared in. Precision
4691 * statements in nested scopes override precision statements in
4692 * outer scopes. Multiple precision statements for the same basic
4693 * type can appear inside the same scope, with later statements
4694 * overriding earlier statements within that scope."
4696 * Default precision specifications follow the same scope rules as
4697 * variables. So, we can track the state of the default float
4698 * precision in the symbol table, and the rules will just work. This
4699 * is a slight abuse of the symbol table, but it has the semantics
4702 ir_variable
*const junk
=
4703 new(state
) ir_variable(type
, "#default precision",
4706 state
->symbols
->add_variable(junk
);
4709 /* FINISHME: Translate precision statements into IR. */
4713 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
4714 * process_record_constructor() can do type-checking on C-style initializer
4715 * expressions of structs, but ast_struct_specifier should only be translated
4716 * to HIR if it is declaring the type of a structure.
4718 * The ->is_declaration field is false for initializers of variables
4719 * declared separately from the struct's type definition.
4721 * struct S { ... }; (is_declaration = true)
4722 * struct T { ... } t = { ... }; (is_declaration = true)
4723 * S s = { ... }; (is_declaration = false)
4725 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
4726 return this->structure
->hir(instructions
, state
);
4733 * Process a structure or interface block tree into an array of structure fields
4735 * After parsing, where there are some syntax differnces, structures and
4736 * interface blocks are almost identical. They are similar enough that the
4737 * AST for each can be processed the same way into a set of
4738 * \c glsl_struct_field to describe the members.
4740 * If we're processing an interface block, var_mode should be the type of the
4741 * interface block (ir_var_shader_in, ir_var_shader_out, or ir_var_uniform).
4742 * If we're processing a structure, var_mode should be ir_var_auto.
4745 * The number of fields processed. A pointer to the array structure fields is
4746 * stored in \c *fields_ret.
4749 ast_process_structure_or_interface_block(exec_list
*instructions
,
4750 struct _mesa_glsl_parse_state
*state
,
4751 exec_list
*declarations
,
4753 glsl_struct_field
**fields_ret
,
4755 bool block_row_major
,
4756 bool allow_reserved_names
,
4757 ir_variable_mode var_mode
)
4759 unsigned decl_count
= 0;
4761 /* Make an initial pass over the list of fields to determine how
4762 * many there are. Each element in this list is an ast_declarator_list.
4763 * This means that we actually need to count the number of elements in the
4764 * 'declarations' list in each of the elements.
4766 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4767 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4772 /* Allocate storage for the fields and process the field
4773 * declarations. As the declarations are processed, try to also convert
4774 * the types to HIR. This ensures that structure definitions embedded in
4775 * other structure definitions or in interface blocks are processed.
4777 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4781 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4782 const char *type_name
;
4784 decl_list
->type
->specifier
->hir(instructions
, state
);
4786 /* Section 10.9 of the GLSL ES 1.00 specification states that
4787 * embedded structure definitions have been removed from the language.
4789 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4790 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
4791 "not allowed in GLSL ES 1.00");
4794 const glsl_type
*decl_type
=
4795 decl_list
->type
->glsl_type(& type_name
, state
);
4797 foreach_list_typed (ast_declaration
, decl
, link
,
4798 &decl_list
->declarations
) {
4799 if (!allow_reserved_names
)
4800 validate_identifier(decl
->identifier
, loc
, state
);
4802 /* From section 4.3.9 of the GLSL 4.40 spec:
4804 * "[In interface blocks] opaque types are not allowed."
4806 * It should be impossible for decl_type to be NULL here. Cases that
4807 * might naturally lead to decl_type being NULL, especially for the
4808 * is_interface case, will have resulted in compilation having
4809 * already halted due to a syntax error.
4811 const struct glsl_type
*field_type
=
4812 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4814 if (is_interface
&& field_type
->contains_opaque()) {
4815 YYLTYPE loc
= decl_list
->get_location();
4816 _mesa_glsl_error(&loc
, state
,
4817 "uniform in non-default uniform block contains "
4821 if (field_type
->contains_atomic()) {
4822 /* FINISHME: Add a spec quotation here once updated spec
4823 * FINISHME: language is available. See Khronos bug #10903
4824 * FINISHME: on whether atomic counters are allowed in
4825 * FINISHME: structures.
4827 YYLTYPE loc
= decl_list
->get_location();
4828 _mesa_glsl_error(&loc
, state
, "atomic counter in structure or "
4832 if (field_type
->contains_image()) {
4833 /* FINISHME: Same problem as with atomic counters.
4834 * FINISHME: Request clarification from Khronos and add
4835 * FINISHME: spec quotation here.
4837 YYLTYPE loc
= decl_list
->get_location();
4838 _mesa_glsl_error(&loc
, state
,
4839 "image in structure or uniform block");
4842 const struct ast_type_qualifier
*const qual
=
4843 & decl_list
->type
->qualifier
;
4844 if (qual
->flags
.q
.std140
||
4845 qual
->flags
.q
.packed
||
4846 qual
->flags
.q
.shared
) {
4847 _mesa_glsl_error(&loc
, state
,
4848 "uniform block layout qualifiers std140, packed, and "
4849 "shared can only be applied to uniform blocks, not "
4853 field_type
= process_array_type(&loc
, decl_type
,
4854 decl
->array_specifier
, state
);
4855 fields
[i
].type
= field_type
;
4856 fields
[i
].name
= decl
->identifier
;
4857 fields
[i
].location
= -1;
4858 fields
[i
].interpolation
=
4859 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
4860 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
4861 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
4863 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4864 if (!qual
->flags
.q
.uniform
) {
4865 _mesa_glsl_error(&loc
, state
,
4866 "row_major and column_major can only be "
4867 "applied to uniform interface blocks");
4869 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
4872 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
4873 _mesa_glsl_error(&loc
, state
,
4874 "interpolation qualifiers cannot be used "
4875 "with uniform interface blocks");
4878 if (field_type
->is_matrix() ||
4879 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4880 fields
[i
].row_major
= block_row_major
;
4881 if (qual
->flags
.q
.row_major
)
4882 fields
[i
].row_major
= true;
4883 else if (qual
->flags
.q
.column_major
)
4884 fields
[i
].row_major
= false;
4891 assert(i
== decl_count
);
4893 *fields_ret
= fields
;
4899 ast_struct_specifier::hir(exec_list
*instructions
,
4900 struct _mesa_glsl_parse_state
*state
)
4902 YYLTYPE loc
= this->get_location();
4904 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
4906 * "Anonymous structures are not supported; so embedded structures must
4907 * have a declarator. A name given to an embedded struct is scoped at
4908 * the same level as the struct it is embedded in."
4910 * The same section of the GLSL 1.20 spec says:
4912 * "Anonymous structures are not supported. Embedded structures are not
4915 * struct S { float f; };
4917 * S; // Error: anonymous structures disallowed
4918 * struct { ... }; // Error: embedded structures disallowed
4919 * S s; // Okay: nested structures with name are allowed
4922 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
4923 * we allow embedded structures in 1.10 only.
4925 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
4926 _mesa_glsl_error(&loc
, state
,
4927 "embedded structure declartions are not allowed");
4929 state
->struct_specifier_depth
++;
4931 glsl_struct_field
*fields
;
4932 unsigned decl_count
=
4933 ast_process_structure_or_interface_block(instructions
,
4935 &this->declarations
,
4940 false /* allow_reserved_names */,
4943 validate_identifier(this->name
, loc
, state
);
4945 const glsl_type
*t
=
4946 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4948 if (!state
->symbols
->add_type(name
, t
)) {
4949 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4951 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4953 state
->num_user_structures
+ 1);
4955 s
[state
->num_user_structures
] = t
;
4956 state
->user_structures
= s
;
4957 state
->num_user_structures
++;
4961 state
->struct_specifier_depth
--;
4963 /* Structure type definitions do not have r-values.
4970 * Visitor class which detects whether a given interface block has been used.
4972 class interface_block_usage_visitor
: public ir_hierarchical_visitor
4975 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
4976 : mode(mode
), block(block
), found(false)
4980 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
4982 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
4986 return visit_continue
;
4989 bool usage_found() const
4995 ir_variable_mode mode
;
4996 const glsl_type
*block
;
5002 ast_interface_block::hir(exec_list
*instructions
,
5003 struct _mesa_glsl_parse_state
*state
)
5005 YYLTYPE loc
= this->get_location();
5007 /* The ast_interface_block has a list of ast_declarator_lists. We
5008 * need to turn those into ir_variables with an association
5009 * with this uniform block.
5011 enum glsl_interface_packing packing
;
5012 if (this->layout
.flags
.q
.shared
) {
5013 packing
= GLSL_INTERFACE_PACKING_SHARED
;
5014 } else if (this->layout
.flags
.q
.packed
) {
5015 packing
= GLSL_INTERFACE_PACKING_PACKED
;
5017 /* The default layout is std140.
5019 packing
= GLSL_INTERFACE_PACKING_STD140
;
5022 ir_variable_mode var_mode
;
5023 const char *iface_type_name
;
5024 if (this->layout
.flags
.q
.in
) {
5025 var_mode
= ir_var_shader_in
;
5026 iface_type_name
= "in";
5027 } else if (this->layout
.flags
.q
.out
) {
5028 var_mode
= ir_var_shader_out
;
5029 iface_type_name
= "out";
5030 } else if (this->layout
.flags
.q
.uniform
) {
5031 var_mode
= ir_var_uniform
;
5032 iface_type_name
= "uniform";
5034 var_mode
= ir_var_auto
;
5035 iface_type_name
= "UNKNOWN";
5036 assert(!"interface block layout qualifier not found!");
5039 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
5040 bool block_row_major
= this->layout
.flags
.q
.row_major
;
5041 exec_list declared_variables
;
5042 glsl_struct_field
*fields
;
5043 unsigned int num_variables
=
5044 ast_process_structure_or_interface_block(&declared_variables
,
5046 &this->declarations
,
5051 redeclaring_per_vertex
,
5054 if (!redeclaring_per_vertex
)
5055 validate_identifier(this->block_name
, loc
, state
);
5057 const glsl_type
*earlier_per_vertex
= NULL
;
5058 if (redeclaring_per_vertex
) {
5059 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
5060 * the named interface block gl_in, we can find it by looking at the
5061 * previous declaration of gl_in. Otherwise we can find it by looking
5062 * at the previous decalartion of any of the built-in outputs,
5065 * Also check that the instance name and array-ness of the redeclaration
5069 case ir_var_shader_in
:
5070 if (ir_variable
*earlier_gl_in
=
5071 state
->symbols
->get_variable("gl_in")) {
5072 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
5074 _mesa_glsl_error(&loc
, state
,
5075 "redeclaration of gl_PerVertex input not allowed "
5077 _mesa_shader_stage_to_string(state
->stage
));
5079 if (this->instance_name
== NULL
||
5080 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
) {
5081 _mesa_glsl_error(&loc
, state
,
5082 "gl_PerVertex input must be redeclared as "
5086 case ir_var_shader_out
:
5087 if (ir_variable
*earlier_gl_Position
=
5088 state
->symbols
->get_variable("gl_Position")) {
5089 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
5091 _mesa_glsl_error(&loc
, state
,
5092 "redeclaration of gl_PerVertex output not "
5093 "allowed in the %s shader",
5094 _mesa_shader_stage_to_string(state
->stage
));
5096 if (this->instance_name
!= NULL
) {
5097 _mesa_glsl_error(&loc
, state
,
5098 "gl_PerVertex input may not be redeclared with "
5099 "an instance name");
5103 _mesa_glsl_error(&loc
, state
,
5104 "gl_PerVertex must be declared as an input or an "
5109 if (earlier_per_vertex
== NULL
) {
5110 /* An error has already been reported. Bail out to avoid null
5111 * dereferences later in this function.
5116 /* Copy locations from the old gl_PerVertex interface block. */
5117 for (unsigned i
= 0; i
< num_variables
; i
++) {
5118 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
5120 _mesa_glsl_error(&loc
, state
,
5121 "redeclaration of gl_PerVertex must be a subset "
5122 "of the built-in members of gl_PerVertex");
5124 fields
[i
].location
=
5125 earlier_per_vertex
->fields
.structure
[j
].location
;
5126 fields
[i
].interpolation
=
5127 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
5128 fields
[i
].centroid
=
5129 earlier_per_vertex
->fields
.structure
[j
].centroid
;
5131 earlier_per_vertex
->fields
.structure
[j
].sample
;
5135 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
5138 * If a built-in interface block is redeclared, it must appear in
5139 * the shader before any use of any member included in the built-in
5140 * declaration, or a compilation error will result.
5142 * This appears to be a clarification to the behaviour established for
5143 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
5144 * regardless of GLSL version.
5146 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
5147 v
.run(instructions
);
5148 if (v
.usage_found()) {
5149 _mesa_glsl_error(&loc
, state
,
5150 "redeclaration of a built-in interface block must "
5151 "appear before any use of any member of the "
5156 const glsl_type
*block_type
=
5157 glsl_type::get_interface_instance(fields
,
5162 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
5163 YYLTYPE loc
= this->get_location();
5164 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
5165 "already taken in the current scope",
5166 this->block_name
, iface_type_name
);
5169 /* Since interface blocks cannot contain statements, it should be
5170 * impossible for the block to generate any instructions.
5172 assert(declared_variables
.is_empty());
5174 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5176 * Geometry shader input variables get the per-vertex values written
5177 * out by vertex shader output variables of the same names. Since a
5178 * geometry shader operates on a set of vertices, each input varying
5179 * variable (or input block, see interface blocks below) needs to be
5180 * declared as an array.
5182 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
5183 var_mode
== ir_var_shader_in
) {
5184 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
5187 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
5190 * "If an instance name (instance-name) is used, then it puts all the
5191 * members inside a scope within its own name space, accessed with the
5192 * field selector ( . ) operator (analogously to structures)."
5194 if (this->instance_name
) {
5195 if (redeclaring_per_vertex
) {
5196 /* When a built-in in an unnamed interface block is redeclared,
5197 * get_variable_being_redeclared() calls
5198 * check_builtin_array_max_size() to make sure that built-in array
5199 * variables aren't redeclared to illegal sizes. But we're looking
5200 * at a redeclaration of a named built-in interface block. So we
5201 * have to manually call check_builtin_array_max_size() for all parts
5202 * of the interface that are arrays.
5204 for (unsigned i
= 0; i
< num_variables
; i
++) {
5205 if (fields
[i
].type
->is_array()) {
5206 const unsigned size
= fields
[i
].type
->array_size();
5207 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
5211 validate_identifier(this->instance_name
, loc
, state
);
5216 if (this->array_specifier
!= NULL
) {
5217 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
5219 * For uniform blocks declared an array, each individual array
5220 * element corresponds to a separate buffer object backing one
5221 * instance of the block. As the array size indicates the number
5222 * of buffer objects needed, uniform block array declarations
5223 * must specify an array size.
5225 * And a few paragraphs later:
5227 * Geometry shader input blocks must be declared as arrays and
5228 * follow the array declaration and linking rules for all
5229 * geometry shader inputs. All other input and output block
5230 * arrays must specify an array size.
5232 * The upshot of this is that the only circumstance where an
5233 * interface array size *doesn't* need to be specified is on a
5234 * geometry shader input.
5236 if (this->array_specifier
->is_unsized_array
&&
5237 (state
->stage
!= MESA_SHADER_GEOMETRY
|| !this->layout
.flags
.q
.in
)) {
5238 _mesa_glsl_error(&loc
, state
,
5239 "only geometry shader inputs may be unsized "
5240 "instance block arrays");
5244 const glsl_type
*block_array_type
=
5245 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
5247 var
= new(state
) ir_variable(block_array_type
,
5248 this->instance_name
,
5251 var
= new(state
) ir_variable(block_type
,
5252 this->instance_name
,
5256 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
5257 handle_geometry_shader_input_decl(state
, loc
, var
);
5259 if (ir_variable
*earlier
=
5260 state
->symbols
->get_variable(this->instance_name
)) {
5261 if (!redeclaring_per_vertex
) {
5262 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
5263 this->instance_name
);
5265 earlier
->data
.how_declared
= ir_var_declared_normally
;
5266 earlier
->type
= var
->type
;
5267 earlier
->reinit_interface_type(block_type
);
5270 state
->symbols
->add_variable(var
);
5271 instructions
->push_tail(var
);
5274 /* In order to have an array size, the block must also be declared with
5277 assert(this->array_specifier
== NULL
);
5279 for (unsigned i
= 0; i
< num_variables
; i
++) {
5281 new(state
) ir_variable(fields
[i
].type
,
5282 ralloc_strdup(state
, fields
[i
].name
),
5284 var
->data
.interpolation
= fields
[i
].interpolation
;
5285 var
->data
.centroid
= fields
[i
].centroid
;
5286 var
->data
.sample
= fields
[i
].sample
;
5287 var
->init_interface_type(block_type
);
5289 if (redeclaring_per_vertex
) {
5290 ir_variable
*earlier
=
5291 get_variable_being_redeclared(var
, loc
, state
,
5292 true /* allow_all_redeclarations */);
5293 if (strncmp(var
->name
, "gl_", 3) != 0 || earlier
== NULL
) {
5294 _mesa_glsl_error(&loc
, state
,
5295 "redeclaration of gl_PerVertex can only "
5296 "include built-in variables");
5297 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
5298 _mesa_glsl_error(&loc
, state
,
5299 "`%s' has already been redeclared", var
->name
);
5301 earlier
->data
.how_declared
= ir_var_declared_in_block
;
5302 earlier
->reinit_interface_type(block_type
);
5307 if (state
->symbols
->get_variable(var
->name
) != NULL
)
5308 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
5310 /* Propagate the "binding" keyword into this UBO's fields;
5311 * the UBO declaration itself doesn't get an ir_variable unless it
5312 * has an instance name. This is ugly.
5314 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5315 var
->data
.binding
= this->layout
.binding
;
5317 state
->symbols
->add_variable(var
);
5318 instructions
->push_tail(var
);
5321 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
5322 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
5324 * It is also a compilation error ... to redeclare a built-in
5325 * block and then use a member from that built-in block that was
5326 * not included in the redeclaration.
5328 * This appears to be a clarification to the behaviour established
5329 * for gl_PerVertex by GLSL 1.50, therefore we implement this
5330 * behaviour regardless of GLSL version.
5332 * To prevent the shader from using a member that was not included in
5333 * the redeclaration, we disable any ir_variables that are still
5334 * associated with the old declaration of gl_PerVertex (since we've
5335 * already updated all of the variables contained in the new
5336 * gl_PerVertex to point to it).
5338 * As a side effect this will prevent
5339 * validate_intrastage_interface_blocks() from getting confused and
5340 * thinking there are conflicting definitions of gl_PerVertex in the
5343 foreach_list_safe(node
, instructions
) {
5344 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5346 var
->get_interface_type() == earlier_per_vertex
&&
5347 var
->data
.mode
== var_mode
) {
5348 if (var
->data
.how_declared
== ir_var_declared_normally
) {
5349 _mesa_glsl_error(&loc
, state
,
5350 "redeclaration of gl_PerVertex cannot "
5351 "follow a redeclaration of `%s'",
5354 state
->symbols
->disable_variable(var
->name
);
5366 ast_gs_input_layout::hir(exec_list
*instructions
,
5367 struct _mesa_glsl_parse_state
*state
)
5369 YYLTYPE loc
= this->get_location();
5371 /* If any geometry input layout declaration preceded this one, make sure it
5372 * was consistent with this one.
5374 if (state
->gs_input_prim_type_specified
&&
5375 state
->in_qualifier
->prim_type
!= this->prim_type
) {
5376 _mesa_glsl_error(&loc
, state
,
5377 "geometry shader input layout does not match"
5378 " previous declaration");
5382 /* If any shader inputs occurred before this declaration and specified an
5383 * array size, make sure the size they specified is consistent with the
5386 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
5387 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
5388 _mesa_glsl_error(&loc
, state
,
5389 "this geometry shader input layout implies %u vertices"
5390 " per primitive, but a previous input is declared"
5391 " with size %u", num_vertices
, state
->gs_input_size
);
5395 state
->gs_input_prim_type_specified
= true;
5397 /* If any shader inputs occurred before this declaration and did not
5398 * specify an array size, their size is determined now.
5400 foreach_list (node
, instructions
) {
5401 ir_variable
*var
= ((ir_instruction
*) node
)->as_variable();
5402 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
5405 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
5409 if (var
->type
->is_unsized_array()) {
5410 if (var
->data
.max_array_access
>= num_vertices
) {
5411 _mesa_glsl_error(&loc
, state
,
5412 "this geometry shader input layout implies %u"
5413 " vertices, but an access to element %u of input"
5414 " `%s' already exists", num_vertices
,
5415 var
->data
.max_array_access
, var
->name
);
5417 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
5428 ast_cs_input_layout::hir(exec_list
*instructions
,
5429 struct _mesa_glsl_parse_state
*state
)
5431 YYLTYPE loc
= this->get_location();
5433 /* If any compute input layout declaration preceded this one, make sure it
5434 * was consistent with this one.
5436 if (state
->cs_input_local_size_specified
) {
5437 for (int i
= 0; i
< 3; i
++) {
5438 if (state
->cs_input_local_size
[i
] != this->local_size
[i
]) {
5439 _mesa_glsl_error(&loc
, state
,
5440 "compute shader input layout does not match"
5441 " previous declaration");
5447 /* From the ARB_compute_shader specification:
5449 * If the local size of the shader in any dimension is greater
5450 * than the maximum size supported by the implementation for that
5451 * dimension, a compile-time error results.
5453 * It is not clear from the spec how the error should be reported if
5454 * the total size of the work group exceeds
5455 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
5456 * report it at compile time as well.
5458 GLuint64 total_invocations
= 1;
5459 for (int i
= 0; i
< 3; i
++) {
5460 if (this->local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
5461 _mesa_glsl_error(&loc
, state
,
5462 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
5464 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
5467 total_invocations
*= this->local_size
[i
];
5468 if (total_invocations
>
5469 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
5470 _mesa_glsl_error(&loc
, state
,
5471 "product of local_sizes exceeds "
5472 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
5473 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
5478 state
->cs_input_local_size_specified
= true;
5479 for (int i
= 0; i
< 3; i
++)
5480 state
->cs_input_local_size
[i
] = this->local_size
[i
];
5482 /* We may now declare the built-in constant gl_WorkGroupSize (see
5483 * builtin_variable_generator::generate_constants() for why we didn't
5484 * declare it earlier).
5486 ir_variable
*var
= new(state
->symbols
)
5487 ir_variable(glsl_type::ivec3_type
, "gl_WorkGroupSize", ir_var_auto
);
5488 var
->data
.how_declared
= ir_var_declared_implicitly
;
5489 var
->data
.read_only
= true;
5490 instructions
->push_tail(var
);
5491 state
->symbols
->add_variable(var
);
5492 ir_constant_data data
;
5493 memset(&data
, 0, sizeof(data
));
5494 for (int i
= 0; i
< 3; i
++)
5495 data
.i
[i
] = this->local_size
[i
];
5496 var
->constant_value
= new(var
) ir_constant(glsl_type::ivec3_type
, &data
);
5497 var
->constant_initializer
=
5498 new(var
) ir_constant(glsl_type::ivec3_type
, &data
);
5499 var
->data
.has_initializer
= true;
5506 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
5507 exec_list
*instructions
)
5509 bool gl_FragColor_assigned
= false;
5510 bool gl_FragData_assigned
= false;
5511 bool user_defined_fs_output_assigned
= false;
5512 ir_variable
*user_defined_fs_output
= NULL
;
5514 /* It would be nice to have proper location information. */
5516 memset(&loc
, 0, sizeof(loc
));
5518 foreach_list(node
, instructions
) {
5519 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
5521 if (!var
|| !var
->data
.assigned
)
5524 if (strcmp(var
->name
, "gl_FragColor") == 0)
5525 gl_FragColor_assigned
= true;
5526 else if (strcmp(var
->name
, "gl_FragData") == 0)
5527 gl_FragData_assigned
= true;
5528 else if (strncmp(var
->name
, "gl_", 3) != 0) {
5529 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
5530 var
->data
.mode
== ir_var_shader_out
) {
5531 user_defined_fs_output_assigned
= true;
5532 user_defined_fs_output
= var
;
5537 /* From the GLSL 1.30 spec:
5539 * "If a shader statically assigns a value to gl_FragColor, it
5540 * may not assign a value to any element of gl_FragData. If a
5541 * shader statically writes a value to any element of
5542 * gl_FragData, it may not assign a value to
5543 * gl_FragColor. That is, a shader may assign values to either
5544 * gl_FragColor or gl_FragData, but not both. Multiple shaders
5545 * linked together must also consistently write just one of
5546 * these variables. Similarly, if user declared output
5547 * variables are in use (statically assigned to), then the
5548 * built-in variables gl_FragColor and gl_FragData may not be
5549 * assigned to. These incorrect usages all generate compile
5552 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
5553 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5554 "`gl_FragColor' and `gl_FragData'");
5555 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
5556 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5557 "`gl_FragColor' and `%s'",
5558 user_defined_fs_output
->name
);
5559 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
5560 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5561 "`gl_FragData' and `%s'",
5562 user_defined_fs_output
->name
);
5568 remove_per_vertex_blocks(exec_list
*instructions
,
5569 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
5571 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
5572 * if it exists in this shader type.
5574 const glsl_type
*per_vertex
= NULL
;
5576 case ir_var_shader_in
:
5577 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
5578 per_vertex
= gl_in
->get_interface_type();
5580 case ir_var_shader_out
:
5581 if (ir_variable
*gl_Position
=
5582 state
->symbols
->get_variable("gl_Position")) {
5583 per_vertex
= gl_Position
->get_interface_type();
5587 assert(!"Unexpected mode");
5591 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
5592 * need to do anything.
5594 if (per_vertex
== NULL
)
5597 /* If the interface block is used by the shader, then we don't need to do
5600 interface_block_usage_visitor
v(mode
, per_vertex
);
5601 v
.run(instructions
);
5602 if (v
.usage_found())
5605 /* Remove any ir_variable declarations that refer to the interface block
5608 foreach_list_safe(node
, instructions
) {
5609 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5610 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
5611 var
->data
.mode
== mode
) {
5612 state
->symbols
->disable_variable(var
->name
);