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
);
2226 var
->data
.location
= qual
->location
;
2229 if (qual
->flags
.q
.explicit_index
) {
2230 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2231 * Layout Qualifiers):
2233 * "It is also a compile-time error if a fragment shader
2234 * sets a layout index to less than 0 or greater than 1."
2236 * Older specifications don't mandate a behavior; we take
2237 * this as a clarification and always generate the error.
2239 if (qual
->index
< 0 || qual
->index
> 1) {
2240 _mesa_glsl_error(loc
, state
,
2241 "explicit index may only be 0 or 1");
2243 var
->data
.explicit_index
= true;
2244 var
->data
.index
= qual
->index
;
2251 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2253 struct _mesa_glsl_parse_state
*state
,
2256 const glsl_type
*base_type
=
2257 (var
->type
->is_array() ? var
->type
->element_type() : var
->type
);
2259 if (base_type
->is_image()) {
2260 if (var
->data
.mode
!= ir_var_uniform
&&
2261 var
->data
.mode
!= ir_var_function_in
) {
2262 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2263 "function parameters or uniform-qualified "
2264 "global variables");
2267 var
->data
.image
.read_only
|= qual
->flags
.q
.read_only
;
2268 var
->data
.image
.write_only
|= qual
->flags
.q
.write_only
;
2269 var
->data
.image
.coherent
|= qual
->flags
.q
.coherent
;
2270 var
->data
.image
._volatile
|= qual
->flags
.q
._volatile
;
2271 var
->data
.image
.restrict_flag
|= qual
->flags
.q
.restrict_flag
;
2272 var
->data
.read_only
= true;
2274 if (qual
->flags
.q
.explicit_image_format
) {
2275 if (var
->data
.mode
== ir_var_function_in
) {
2276 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2277 "used on image function parameters");
2280 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2281 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2282 "base data type of the image");
2285 var
->data
.image
.format
= qual
->image_format
;
2287 if (var
->data
.mode
== ir_var_uniform
&& !qual
->flags
.q
.write_only
) {
2288 _mesa_glsl_error(loc
, state
, "uniforms not qualified with "
2289 "`writeonly' must have a format layout "
2293 var
->data
.image
.format
= GL_NONE
;
2299 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2301 struct _mesa_glsl_parse_state
*state
,
2305 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2307 if (qual
->flags
.q
.invariant
) {
2308 if (var
->data
.used
) {
2309 _mesa_glsl_error(loc
, state
,
2310 "variable `%s' may not be redeclared "
2311 "`invariant' after being used",
2314 var
->data
.invariant
= 1;
2318 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2319 || qual
->flags
.q
.uniform
2320 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2321 var
->data
.read_only
= 1;
2323 if (qual
->flags
.q
.centroid
)
2324 var
->data
.centroid
= 1;
2326 if (qual
->flags
.q
.sample
)
2327 var
->data
.sample
= 1;
2329 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
2330 var
->type
= glsl_type::error_type
;
2331 _mesa_glsl_error(loc
, state
,
2332 "`attribute' variables may not be declared in the "
2334 _mesa_shader_stage_to_string(state
->stage
));
2337 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2339 * "However, the const qualifier cannot be used with out or inout."
2341 * The same section of the GLSL 4.40 spec further clarifies this saying:
2343 * "The const qualifier cannot be used with out or inout, or a
2344 * compile-time error results."
2346 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2347 _mesa_glsl_error(loc
, state
,
2348 "`const' may not be applied to `out' or `inout' "
2349 "function parameters");
2352 /* If there is no qualifier that changes the mode of the variable, leave
2353 * the setting alone.
2355 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2356 var
->data
.mode
= ir_var_function_inout
;
2357 else if (qual
->flags
.q
.in
)
2358 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2359 else if (qual
->flags
.q
.attribute
2360 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2361 var
->data
.mode
= ir_var_shader_in
;
2362 else if (qual
->flags
.q
.out
)
2363 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2364 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
2365 var
->data
.mode
= ir_var_shader_out
;
2366 else if (qual
->flags
.q
.uniform
)
2367 var
->data
.mode
= ir_var_uniform
;
2369 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
2370 /* User-defined ins/outs are not permitted in compute shaders. */
2371 if (state
->stage
== MESA_SHADER_COMPUTE
) {
2372 _mesa_glsl_error(loc
, state
,
2373 "user-defined input and output variables are not "
2374 "permitted in compute shaders");
2377 /* This variable is being used to link data between shader stages (in
2378 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2379 * that is allowed for such purposes.
2381 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2383 * "The varying qualifier can be used only with the data types
2384 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2387 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2388 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2390 * "Fragment inputs can only be signed and unsigned integers and
2391 * integer vectors, float, floating-point vectors, matrices, or
2392 * arrays of these. Structures cannot be input.
2394 * Similar text exists in the section on vertex shader outputs.
2396 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2397 * 3.00 spec allows structs as well. Varying structs are also allowed
2400 switch (var
->type
->get_scalar_type()->base_type
) {
2401 case GLSL_TYPE_FLOAT
:
2402 /* Ok in all GLSL versions */
2404 case GLSL_TYPE_UINT
:
2406 if (state
->is_version(130, 300))
2408 _mesa_glsl_error(loc
, state
,
2409 "varying variables must be of base type float in %s",
2410 state
->get_version_string());
2412 case GLSL_TYPE_STRUCT
:
2413 if (state
->is_version(150, 300))
2415 _mesa_glsl_error(loc
, state
,
2416 "varying variables may not be of type struct");
2419 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2424 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2425 switch (state
->stage
) {
2426 case MESA_SHADER_VERTEX
:
2427 if (var
->data
.mode
== ir_var_shader_out
)
2428 var
->data
.invariant
= true;
2430 case MESA_SHADER_GEOMETRY
:
2431 if ((var
->data
.mode
== ir_var_shader_in
)
2432 || (var
->data
.mode
== ir_var_shader_out
))
2433 var
->data
.invariant
= true;
2435 case MESA_SHADER_FRAGMENT
:
2436 if (var
->data
.mode
== ir_var_shader_in
)
2437 var
->data
.invariant
= true;
2439 case MESA_SHADER_COMPUTE
:
2440 /* Invariance isn't meaningful in compute shaders. */
2445 var
->data
.interpolation
=
2446 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
2449 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2450 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2451 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2452 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2453 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2454 ? "origin_upper_left" : "pixel_center_integer";
2456 _mesa_glsl_error(loc
, state
,
2457 "layout qualifier `%s' can only be applied to "
2458 "fragment shader input `gl_FragCoord'",
2462 if (qual
->flags
.q
.explicit_location
) {
2463 validate_explicit_location(qual
, var
, state
, loc
);
2464 } else if (qual
->flags
.q
.explicit_index
) {
2465 _mesa_glsl_error(loc
, state
,
2466 "explicit index requires explicit location");
2469 if (qual
->flags
.q
.explicit_binding
&&
2470 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2471 var
->data
.explicit_binding
= true;
2472 var
->data
.binding
= qual
->binding
;
2475 if (var
->type
->contains_atomic()) {
2476 if (var
->data
.mode
== ir_var_uniform
) {
2477 if (var
->data
.explicit_binding
) {
2479 &state
->atomic_counter_offsets
[var
->data
.binding
];
2481 if (*offset
% ATOMIC_COUNTER_SIZE
)
2482 _mesa_glsl_error(loc
, state
,
2483 "misaligned atomic counter offset");
2485 var
->data
.atomic
.offset
= *offset
;
2486 *offset
+= var
->type
->atomic_size();
2489 _mesa_glsl_error(loc
, state
,
2490 "atomic counters require explicit binding point");
2492 } else if (var
->data
.mode
!= ir_var_function_in
) {
2493 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
2494 "function parameters or uniform-qualified "
2495 "global variables");
2499 /* Does the declaration use the deprecated 'attribute' or 'varying'
2502 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2503 || qual
->flags
.q
.varying
;
2505 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2506 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2507 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2508 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2509 * These extensions and all following extensions that add the 'layout'
2510 * keyword have been modified to require the use of 'in' or 'out'.
2512 * The following extension do not allow the deprecated keywords:
2514 * GL_AMD_conservative_depth
2515 * GL_ARB_conservative_depth
2516 * GL_ARB_gpu_shader5
2517 * GL_ARB_separate_shader_objects
2518 * GL_ARB_tesselation_shader
2519 * GL_ARB_transform_feedback3
2520 * GL_ARB_uniform_buffer_object
2522 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2523 * allow layout with the deprecated keywords.
2525 const bool relaxed_layout_qualifier_checking
=
2526 state
->ARB_fragment_coord_conventions_enable
;
2528 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2529 if (relaxed_layout_qualifier_checking
) {
2530 _mesa_glsl_warning(loc
, state
,
2531 "`layout' qualifier may not be used with "
2532 "`attribute' or `varying'");
2534 _mesa_glsl_error(loc
, state
,
2535 "`layout' qualifier may not be used with "
2536 "`attribute' or `varying'");
2540 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2541 * AMD_conservative_depth.
2543 int depth_layout_count
= qual
->flags
.q
.depth_any
2544 + qual
->flags
.q
.depth_greater
2545 + qual
->flags
.q
.depth_less
2546 + qual
->flags
.q
.depth_unchanged
;
2547 if (depth_layout_count
> 0
2548 && !state
->AMD_conservative_depth_enable
2549 && !state
->ARB_conservative_depth_enable
) {
2550 _mesa_glsl_error(loc
, state
,
2551 "extension GL_AMD_conservative_depth or "
2552 "GL_ARB_conservative_depth must be enabled "
2553 "to use depth layout qualifiers");
2554 } else if (depth_layout_count
> 0
2555 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2556 _mesa_glsl_error(loc
, state
,
2557 "depth layout qualifiers can be applied only to "
2559 } else if (depth_layout_count
> 1
2560 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2561 _mesa_glsl_error(loc
, state
,
2562 "at most one depth layout qualifier can be applied to "
2565 if (qual
->flags
.q
.depth_any
)
2566 var
->data
.depth_layout
= ir_depth_layout_any
;
2567 else if (qual
->flags
.q
.depth_greater
)
2568 var
->data
.depth_layout
= ir_depth_layout_greater
;
2569 else if (qual
->flags
.q
.depth_less
)
2570 var
->data
.depth_layout
= ir_depth_layout_less
;
2571 else if (qual
->flags
.q
.depth_unchanged
)
2572 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
2574 var
->data
.depth_layout
= ir_depth_layout_none
;
2576 if (qual
->flags
.q
.std140
||
2577 qual
->flags
.q
.packed
||
2578 qual
->flags
.q
.shared
) {
2579 _mesa_glsl_error(loc
, state
,
2580 "uniform block layout qualifiers std140, packed, and "
2581 "shared can only be applied to uniform blocks, not "
2585 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2586 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
2589 if (var
->type
->contains_image())
2590 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
2594 * Get the variable that is being redeclared by this declaration
2596 * Semantic checks to verify the validity of the redeclaration are also
2597 * performed. If semantic checks fail, compilation error will be emitted via
2598 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2601 * A pointer to an existing variable in the current scope if the declaration
2602 * is a redeclaration, \c NULL otherwise.
2604 static ir_variable
*
2605 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
2606 struct _mesa_glsl_parse_state
*state
,
2607 bool allow_all_redeclarations
)
2609 /* Check if this declaration is actually a re-declaration, either to
2610 * resize an array or add qualifiers to an existing variable.
2612 * This is allowed for variables in the current scope, or when at
2613 * global scope (for built-ins in the implicit outer scope).
2615 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
2616 if (earlier
== NULL
||
2617 (state
->current_function
!= NULL
&&
2618 !state
->symbols
->name_declared_this_scope(var
->name
))) {
2623 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2625 * "It is legal to declare an array without a size and then
2626 * later re-declare the same name as an array of the same
2627 * type and specify a size."
2629 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
2630 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2631 /* FINISHME: This doesn't match the qualifiers on the two
2632 * FINISHME: declarations. It's not 100% clear whether this is
2633 * FINISHME: required or not.
2636 const unsigned size
= unsigned(var
->type
->array_size());
2637 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2638 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
2639 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2641 earlier
->data
.max_array_access
);
2644 earlier
->type
= var
->type
;
2647 } else if ((state
->ARB_fragment_coord_conventions_enable
||
2648 state
->is_version(150, 0))
2649 && strcmp(var
->name
, "gl_FragCoord") == 0
2650 && earlier
->type
== var
->type
2651 && earlier
->data
.mode
== var
->data
.mode
) {
2652 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2655 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
2656 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
2658 /* According to section 4.3.7 of the GLSL 1.30 spec,
2659 * the following built-in varaibles can be redeclared with an
2660 * interpolation qualifier:
2663 * * gl_FrontSecondaryColor
2664 * * gl_BackSecondaryColor
2666 * * gl_SecondaryColor
2668 } else if (state
->is_version(130, 0)
2669 && (strcmp(var
->name
, "gl_FrontColor") == 0
2670 || strcmp(var
->name
, "gl_BackColor") == 0
2671 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2672 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2673 || strcmp(var
->name
, "gl_Color") == 0
2674 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2675 && earlier
->type
== var
->type
2676 && earlier
->data
.mode
== var
->data
.mode
) {
2677 earlier
->data
.interpolation
= var
->data
.interpolation
;
2679 /* Layout qualifiers for gl_FragDepth. */
2680 } else if ((state
->AMD_conservative_depth_enable
||
2681 state
->ARB_conservative_depth_enable
)
2682 && strcmp(var
->name
, "gl_FragDepth") == 0
2683 && earlier
->type
== var
->type
2684 && earlier
->data
.mode
== var
->data
.mode
) {
2686 /** From the AMD_conservative_depth spec:
2687 * Within any shader, the first redeclarations of gl_FragDepth
2688 * must appear before any use of gl_FragDepth.
2690 if (earlier
->data
.used
) {
2691 _mesa_glsl_error(&loc
, state
,
2692 "the first redeclaration of gl_FragDepth "
2693 "must appear before any use of gl_FragDepth");
2696 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2697 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
2698 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
2699 _mesa_glsl_error(&loc
, state
,
2700 "gl_FragDepth: depth layout is declared here "
2701 "as '%s, but it was previously declared as "
2703 depth_layout_string(var
->data
.depth_layout
),
2704 depth_layout_string(earlier
->data
.depth_layout
));
2707 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
2709 } else if (allow_all_redeclarations
) {
2710 if (earlier
->data
.mode
!= var
->data
.mode
) {
2711 _mesa_glsl_error(&loc
, state
,
2712 "redeclaration of `%s' with incorrect qualifiers",
2714 } else if (earlier
->type
!= var
->type
) {
2715 _mesa_glsl_error(&loc
, state
,
2716 "redeclaration of `%s' has incorrect type",
2720 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
2727 * Generate the IR for an initializer in a variable declaration
2730 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2731 ast_fully_specified_type
*type
,
2732 exec_list
*initializer_instructions
,
2733 struct _mesa_glsl_parse_state
*state
)
2735 ir_rvalue
*result
= NULL
;
2737 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2739 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2741 * "All uniform variables are read-only and are initialized either
2742 * directly by an application via API commands, or indirectly by
2745 if (var
->data
.mode
== ir_var_uniform
) {
2746 state
->check_version(120, 0, &initializer_loc
,
2747 "cannot initialize uniforms");
2750 /* From section 4.1.7 of the GLSL 4.40 spec:
2752 * "Opaque variables [...] are initialized only through the
2753 * OpenGL API; they cannot be declared with an initializer in a
2756 if (var
->type
->contains_opaque()) {
2757 _mesa_glsl_error(& initializer_loc
, state
,
2758 "cannot initialize opaque variable");
2761 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2762 _mesa_glsl_error(& initializer_loc
, state
,
2763 "cannot initialize %s shader input / %s",
2764 _mesa_shader_stage_to_string(state
->stage
),
2765 (state
->stage
== MESA_SHADER_VERTEX
)
2766 ? "attribute" : "varying");
2769 /* If the initializer is an ast_aggregate_initializer, recursively store
2770 * type information from the LHS into it, so that its hir() function can do
2773 if (decl
->initializer
->oper
== ast_aggregate
)
2774 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
2776 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2777 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2780 /* Calculate the constant value if this is a const or uniform
2783 if (type
->qualifier
.flags
.q
.constant
2784 || type
->qualifier
.flags
.q
.uniform
) {
2785 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
2786 var
->type
, rhs
, true);
2787 if (new_rhs
!= NULL
) {
2790 ir_constant
*constant_value
= rhs
->constant_expression_value();
2791 if (!constant_value
) {
2792 /* If ARB_shading_language_420pack is enabled, initializers of
2793 * const-qualified local variables do not have to be constant
2794 * expressions. Const-qualified global variables must still be
2795 * initialized with constant expressions.
2797 if (!state
->ARB_shading_language_420pack_enable
2798 || state
->current_function
== NULL
) {
2799 _mesa_glsl_error(& initializer_loc
, state
,
2800 "initializer of %s variable `%s' must be a "
2801 "constant expression",
2802 (type
->qualifier
.flags
.q
.constant
)
2803 ? "const" : "uniform",
2805 if (var
->type
->is_numeric()) {
2806 /* Reduce cascading errors. */
2807 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2811 rhs
= constant_value
;
2812 var
->constant_value
= constant_value
;
2815 if (var
->type
->is_numeric()) {
2816 /* Reduce cascading errors. */
2817 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2822 if (rhs
&& !rhs
->type
->is_error()) {
2823 bool temp
= var
->data
.read_only
;
2824 if (type
->qualifier
.flags
.q
.constant
)
2825 var
->data
.read_only
= false;
2827 /* Never emit code to initialize a uniform.
2829 const glsl_type
*initializer_type
;
2830 if (!type
->qualifier
.flags
.q
.uniform
) {
2831 result
= do_assignment(initializer_instructions
, state
,
2834 type
->get_location());
2835 initializer_type
= result
->type
;
2837 initializer_type
= rhs
->type
;
2839 var
->constant_initializer
= rhs
->constant_expression_value();
2840 var
->data
.has_initializer
= true;
2842 /* If the declared variable is an unsized array, it must inherrit
2843 * its full type from the initializer. A declaration such as
2845 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2849 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2851 * The assignment generated in the if-statement (below) will also
2852 * automatically handle this case for non-uniforms.
2854 * If the declared variable is not an array, the types must
2855 * already match exactly. As a result, the type assignment
2856 * here can be done unconditionally. For non-uniforms the call
2857 * to do_assignment can change the type of the initializer (via
2858 * the implicit conversion rules). For uniforms the initializer
2859 * must be a constant expression, and the type of that expression
2860 * was validated above.
2862 var
->type
= initializer_type
;
2864 var
->data
.read_only
= temp
;
2872 * Do additional processing necessary for geometry shader input declarations
2873 * (this covers both interface blocks arrays and bare input variables).
2876 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
2877 YYLTYPE loc
, ir_variable
*var
)
2879 unsigned num_vertices
= 0;
2880 if (state
->gs_input_prim_type_specified
) {
2881 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
2884 /* Geometry shader input variables must be arrays. Caller should have
2885 * reported an error for this.
2887 if (!var
->type
->is_array()) {
2888 assert(state
->error
);
2890 /* To avoid cascading failures, short circuit the checks below. */
2894 if (var
->type
->is_unsized_array()) {
2895 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
2897 * All geometry shader input unsized array declarations will be
2898 * sized by an earlier input layout qualifier, when present, as per
2899 * the following table.
2901 * Followed by a table mapping each allowed input layout qualifier to
2902 * the corresponding input length.
2904 if (num_vertices
!= 0)
2905 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
2908 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
2909 * includes the following examples of compile-time errors:
2911 * // code sequence within one shader...
2912 * in vec4 Color1[]; // size unknown
2913 * ...Color1.length()...// illegal, length() unknown
2914 * in vec4 Color2[2]; // size is 2
2915 * ...Color1.length()...// illegal, Color1 still has no size
2916 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
2917 * layout(lines) in; // legal, input size is 2, matching
2918 * in vec4 Color4[3]; // illegal, contradicts layout
2921 * To detect the case illustrated by Color3, we verify that the size of
2922 * an explicitly-sized array matches the size of any previously declared
2923 * explicitly-sized array. To detect the case illustrated by Color4, we
2924 * verify that the size of an explicitly-sized array is consistent with
2925 * any previously declared input layout.
2927 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
2928 _mesa_glsl_error(&loc
, state
,
2929 "geometry shader input size contradicts previously"
2930 " declared layout (size is %u, but layout requires a"
2931 " size of %u)", var
->type
->length
, num_vertices
);
2932 } else if (state
->gs_input_size
!= 0 &&
2933 var
->type
->length
!= state
->gs_input_size
) {
2934 _mesa_glsl_error(&loc
, state
,
2935 "geometry shader input sizes are "
2936 "inconsistent (size is %u, but a previous "
2937 "declaration has size %u)",
2938 var
->type
->length
, state
->gs_input_size
);
2940 state
->gs_input_size
= var
->type
->length
;
2947 validate_identifier(const char *identifier
, YYLTYPE loc
,
2948 struct _mesa_glsl_parse_state
*state
)
2950 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2952 * "Identifiers starting with "gl_" are reserved for use by
2953 * OpenGL, and may not be declared in a shader as either a
2954 * variable or a function."
2956 if (strncmp(identifier
, "gl_", 3) == 0) {
2957 _mesa_glsl_error(&loc
, state
,
2958 "identifier `%s' uses reserved `gl_' prefix",
2960 } else if (strstr(identifier
, "__")) {
2961 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2964 * "In addition, all identifiers containing two
2965 * consecutive underscores (__) are reserved as
2966 * possible future keywords."
2968 * The intention is that names containing __ are reserved for internal
2969 * use by the implementation, and names prefixed with GL_ are reserved
2970 * for use by Khronos. Names simply containing __ are dangerous to use,
2971 * but should be allowed.
2973 * A future version of the GLSL specification will clarify this.
2975 _mesa_glsl_warning(&loc
, state
,
2976 "identifier `%s' uses reserved `__' string",
2983 ast_declarator_list::hir(exec_list
*instructions
,
2984 struct _mesa_glsl_parse_state
*state
)
2987 const struct glsl_type
*decl_type
;
2988 const char *type_name
= NULL
;
2989 ir_rvalue
*result
= NULL
;
2990 YYLTYPE loc
= this->get_location();
2992 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2994 * "To ensure that a particular output variable is invariant, it is
2995 * necessary to use the invariant qualifier. It can either be used to
2996 * qualify a previously declared variable as being invariant
2998 * invariant gl_Position; // make existing gl_Position be invariant"
3000 * In these cases the parser will set the 'invariant' flag in the declarator
3001 * list, and the type will be NULL.
3003 if (this->invariant
) {
3004 assert(this->type
== NULL
);
3006 if (state
->current_function
!= NULL
) {
3007 _mesa_glsl_error(& loc
, state
,
3008 "all uses of `invariant' keyword must be at global "
3012 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3013 assert(decl
->array_specifier
== NULL
);
3014 assert(decl
->initializer
== NULL
);
3016 ir_variable
*const earlier
=
3017 state
->symbols
->get_variable(decl
->identifier
);
3018 if (earlier
== NULL
) {
3019 _mesa_glsl_error(& loc
, state
,
3020 "undeclared variable `%s' cannot be marked "
3021 "invariant", decl
->identifier
);
3022 } else if ((state
->stage
== MESA_SHADER_VERTEX
)
3023 && (earlier
->data
.mode
!= ir_var_shader_out
)) {
3024 _mesa_glsl_error(& loc
, state
,
3025 "`%s' cannot be marked invariant, vertex shader "
3026 "outputs only", decl
->identifier
);
3027 } else if ((state
->stage
== MESA_SHADER_FRAGMENT
)
3028 && (earlier
->data
.mode
!= ir_var_shader_in
)) {
3029 _mesa_glsl_error(& loc
, state
,
3030 "`%s' cannot be marked invariant, fragment shader "
3031 "inputs only", decl
->identifier
);
3032 } else if (earlier
->data
.used
) {
3033 _mesa_glsl_error(& loc
, state
,
3034 "variable `%s' may not be redeclared "
3035 "`invariant' after being used",
3038 earlier
->data
.invariant
= true;
3042 /* Invariant redeclarations do not have r-values.
3047 assert(this->type
!= NULL
);
3048 assert(!this->invariant
);
3050 /* The type specifier may contain a structure definition. Process that
3051 * before any of the variable declarations.
3053 (void) this->type
->specifier
->hir(instructions
, state
);
3055 decl_type
= this->type
->glsl_type(& type_name
, state
);
3057 /* An offset-qualified atomic counter declaration sets the default
3058 * offset for the next declaration within the same atomic counter
3061 if (decl_type
&& decl_type
->contains_atomic()) {
3062 if (type
->qualifier
.flags
.q
.explicit_binding
&&
3063 type
->qualifier
.flags
.q
.explicit_offset
)
3064 state
->atomic_counter_offsets
[type
->qualifier
.binding
] =
3065 type
->qualifier
.offset
;
3068 if (this->declarations
.is_empty()) {
3069 /* If there is no structure involved in the program text, there are two
3070 * possible scenarios:
3072 * - The program text contained something like 'vec4;'. This is an
3073 * empty declaration. It is valid but weird. Emit a warning.
3075 * - The program text contained something like 'S;' and 'S' is not the
3076 * name of a known structure type. This is both invalid and weird.
3079 * - The program text contained something like 'mediump float;'
3080 * when the programmer probably meant 'precision mediump
3081 * float;' Emit a warning with a description of what they
3082 * probably meant to do.
3084 * Note that if decl_type is NULL and there is a structure involved,
3085 * there must have been some sort of error with the structure. In this
3086 * case we assume that an error was already generated on this line of
3087 * code for the structure. There is no need to generate an additional,
3090 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
3093 if (decl_type
== NULL
) {
3094 _mesa_glsl_error(&loc
, state
,
3095 "invalid type `%s' in empty declaration",
3097 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
3098 /* Empty atomic counter declarations are allowed and useful
3099 * to set the default offset qualifier.
3102 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3103 if (this->type
->specifier
->structure
!= NULL
) {
3104 _mesa_glsl_error(&loc
, state
,
3105 "precision qualifiers can't be applied "
3108 static const char *const precision_names
[] = {
3115 _mesa_glsl_warning(&loc
, state
,
3116 "empty declaration with precision qualifier, "
3117 "to set the default precision, use "
3118 "`precision %s %s;'",
3119 precision_names
[this->type
->qualifier
.precision
],
3122 } else if (this->type
->specifier
->structure
== NULL
) {
3123 _mesa_glsl_warning(&loc
, state
, "empty declaration");
3127 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3128 const struct glsl_type
*var_type
;
3131 /* FINISHME: Emit a warning if a variable declaration shadows a
3132 * FINISHME: declaration at a higher scope.
3135 if ((decl_type
== NULL
) || decl_type
->is_void()) {
3136 if (type_name
!= NULL
) {
3137 _mesa_glsl_error(& loc
, state
,
3138 "invalid type `%s' in declaration of `%s'",
3139 type_name
, decl
->identifier
);
3141 _mesa_glsl_error(& loc
, state
,
3142 "invalid type in declaration of `%s'",
3148 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
3151 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
3153 /* The 'varying in' and 'varying out' qualifiers can only be used with
3154 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
3157 if (this->type
->qualifier
.flags
.q
.varying
) {
3158 if (this->type
->qualifier
.flags
.q
.in
) {
3159 _mesa_glsl_error(& loc
, state
,
3160 "`varying in' qualifier in declaration of "
3161 "`%s' only valid for geometry shaders using "
3162 "ARB_geometry_shader4 or EXT_geometry_shader4",
3164 } else if (this->type
->qualifier
.flags
.q
.out
) {
3165 _mesa_glsl_error(& loc
, state
,
3166 "`varying out' qualifier in declaration of "
3167 "`%s' only valid for geometry shaders using "
3168 "ARB_geometry_shader4 or EXT_geometry_shader4",
3173 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
3175 * "Global variables can only use the qualifiers const,
3176 * attribute, uni form, or varying. Only one may be
3179 * Local variables can only use the qualifier const."
3181 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
3182 * any extension that adds the 'layout' keyword.
3184 if (!state
->is_version(130, 300)
3185 && !state
->has_explicit_attrib_location()
3186 && !state
->has_separate_shader_objects()
3187 && !state
->ARB_fragment_coord_conventions_enable
) {
3188 if (this->type
->qualifier
.flags
.q
.out
) {
3189 _mesa_glsl_error(& loc
, state
,
3190 "`out' qualifier in declaration of `%s' "
3191 "only valid for function parameters in %s",
3192 decl
->identifier
, state
->get_version_string());
3194 if (this->type
->qualifier
.flags
.q
.in
) {
3195 _mesa_glsl_error(& loc
, state
,
3196 "`in' qualifier in declaration of `%s' "
3197 "only valid for function parameters in %s",
3198 decl
->identifier
, state
->get_version_string());
3200 /* FINISHME: Test for other invalid qualifiers. */
3203 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
3206 if (this->type
->qualifier
.flags
.q
.invariant
) {
3207 if ((state
->stage
== MESA_SHADER_VERTEX
) &&
3208 var
->data
.mode
!= ir_var_shader_out
) {
3209 _mesa_glsl_error(& loc
, state
,
3210 "`%s' cannot be marked invariant, vertex shader "
3211 "outputs only", var
->name
);
3212 } else if ((state
->stage
== MESA_SHADER_FRAGMENT
) &&
3213 var
->data
.mode
!= ir_var_shader_in
) {
3214 /* FINISHME: Note that this doesn't work for invariant on
3215 * a function signature inval
3217 _mesa_glsl_error(& loc
, state
,
3218 "`%s' cannot be marked invariant, fragment shader "
3219 "inputs only", var
->name
);
3223 if (state
->current_function
!= NULL
) {
3224 const char *mode
= NULL
;
3225 const char *extra
= "";
3227 /* There is no need to check for 'inout' here because the parser will
3228 * only allow that in function parameter lists.
3230 if (this->type
->qualifier
.flags
.q
.attribute
) {
3232 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
3234 } else if (this->type
->qualifier
.flags
.q
.varying
) {
3236 } else if (this->type
->qualifier
.flags
.q
.in
) {
3238 extra
= " or in function parameter list";
3239 } else if (this->type
->qualifier
.flags
.q
.out
) {
3241 extra
= " or in function parameter list";
3245 _mesa_glsl_error(& loc
, state
,
3246 "%s variable `%s' must be declared at "
3248 mode
, var
->name
, extra
);
3250 } else if (var
->data
.mode
== ir_var_shader_in
) {
3251 var
->data
.read_only
= true;
3253 if (state
->stage
== MESA_SHADER_VERTEX
) {
3254 bool error_emitted
= false;
3256 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3258 * "Vertex shader inputs can only be float, floating-point
3259 * vectors, matrices, signed and unsigned integers and integer
3260 * vectors. Vertex shader inputs can also form arrays of these
3261 * types, but not structures."
3263 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3265 * "Vertex shader inputs can only be float, floating-point
3266 * vectors, matrices, signed and unsigned integers and integer
3267 * vectors. They cannot be arrays or structures."
3269 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3271 * "The attribute qualifier can be used only with float,
3272 * floating-point vectors, and matrices. Attribute variables
3273 * cannot be declared as arrays or structures."
3275 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3277 * "Vertex shader inputs can only be float, floating-point
3278 * vectors, matrices, signed and unsigned integers and integer
3279 * vectors. Vertex shader inputs cannot be arrays or
3282 const glsl_type
*check_type
= var
->type
;
3283 while (check_type
->is_array())
3284 check_type
= check_type
->element_type();
3286 switch (check_type
->base_type
) {
3287 case GLSL_TYPE_FLOAT
:
3289 case GLSL_TYPE_UINT
:
3291 if (state
->is_version(120, 300))
3295 _mesa_glsl_error(& loc
, state
,
3296 "vertex shader input / attribute cannot have "
3298 var
->type
->is_array() ? "array of " : "",
3300 error_emitted
= true;
3303 if (!error_emitted
&& var
->type
->is_array() &&
3304 !state
->check_version(150, 0, &loc
,
3305 "vertex shader input / attribute "
3306 "cannot have array type")) {
3307 error_emitted
= true;
3309 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
3310 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3312 * Geometry shader input variables get the per-vertex values
3313 * written out by vertex shader output variables of the same
3314 * names. Since a geometry shader operates on a set of
3315 * vertices, each input varying variable (or input block, see
3316 * interface blocks below) needs to be declared as an array.
3318 if (!var
->type
->is_array()) {
3319 _mesa_glsl_error(&loc
, state
,
3320 "geometry shader inputs must be arrays");
3323 handle_geometry_shader_input_decl(state
, loc
, var
);
3327 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3328 * so must integer vertex outputs.
3330 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3331 * "Fragment shader inputs that are signed or unsigned integers or
3332 * integer vectors must be qualified with the interpolation qualifier
3335 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3336 * "Fragment shader inputs that are, or contain, signed or unsigned
3337 * integers or integer vectors must be qualified with the
3338 * interpolation qualifier flat."
3340 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3341 * "Vertex shader outputs that are, or contain, signed or unsigned
3342 * integers or integer vectors must be qualified with the
3343 * interpolation qualifier flat."
3345 * Note that prior to GLSL 1.50, this requirement applied to vertex
3346 * outputs rather than fragment inputs. That creates problems in the
3347 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3348 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3349 * apply the restriction to both vertex outputs and fragment inputs.
3351 * Note also that the desktop GLSL specs are missing the text "or
3352 * contain"; this is presumably an oversight, since there is no
3353 * reasonable way to interpolate a fragment shader input that contains
3356 if (state
->is_version(130, 300) &&
3357 var
->type
->contains_integer() &&
3358 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
3359 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
3360 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
3361 && state
->es_shader
))) {
3362 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
3363 "vertex output" : "fragment input";
3364 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
3365 "an integer, then it must be qualified with 'flat'",
3370 /* Interpolation qualifiers cannot be applied to 'centroid' and
3371 * 'centroid varying'.
3373 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3374 * "interpolation qualifiers may only precede the qualifiers in,
3375 * centroid in, out, or centroid out in a declaration. They do not apply
3376 * to the deprecated storage qualifiers varying or centroid varying."
3378 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3380 if (state
->is_version(130, 0)
3381 && this->type
->qualifier
.has_interpolation()
3382 && this->type
->qualifier
.flags
.q
.varying
) {
3384 const char *i
= this->type
->qualifier
.interpolation_string();
3387 if (this->type
->qualifier
.flags
.q
.centroid
)
3388 s
= "centroid varying";
3392 _mesa_glsl_error(&loc
, state
,
3393 "qualifier '%s' cannot be applied to the "
3394 "deprecated storage qualifier '%s'", i
, s
);
3398 /* Interpolation qualifiers can only apply to vertex shader outputs and
3399 * fragment shader inputs.
3401 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3402 * "Outputs from a vertex shader (out) and inputs to a fragment
3403 * shader (in) can be further qualified with one or more of these
3404 * interpolation qualifiers"
3406 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
3407 * "These interpolation qualifiers may only precede the qualifiers
3408 * in, centroid in, out, or centroid out in a declaration. They do
3409 * not apply to inputs into a vertex shader or outputs from a
3412 if (state
->is_version(130, 300)
3413 && this->type
->qualifier
.has_interpolation()) {
3415 const char *i
= this->type
->qualifier
.interpolation_string();
3418 switch (state
->stage
) {
3419 case MESA_SHADER_VERTEX
:
3420 if (this->type
->qualifier
.flags
.q
.in
) {
3421 _mesa_glsl_error(&loc
, state
,
3422 "qualifier '%s' cannot be applied to vertex "
3423 "shader inputs", i
);
3426 case MESA_SHADER_FRAGMENT
:
3427 if (this->type
->qualifier
.flags
.q
.out
) {
3428 _mesa_glsl_error(&loc
, state
,
3429 "qualifier '%s' cannot be applied to fragment "
3430 "shader outputs", i
);
3439 /* From section 4.3.4 of the GLSL 1.30 spec:
3440 * "It is an error to use centroid in in a vertex shader."
3442 * From section 4.3.4 of the GLSL ES 3.00 spec:
3443 * "It is an error to use centroid in or interpolation qualifiers in
3444 * a vertex shader input."
3446 if (state
->is_version(130, 300)
3447 && this->type
->qualifier
.flags
.q
.centroid
3448 && this->type
->qualifier
.flags
.q
.in
3449 && state
->stage
== MESA_SHADER_VERTEX
) {
3451 _mesa_glsl_error(&loc
, state
,
3452 "'centroid in' cannot be used in a vertex shader");
3455 if (state
->stage
== MESA_SHADER_VERTEX
3456 && this->type
->qualifier
.flags
.q
.sample
3457 && this->type
->qualifier
.flags
.q
.in
) {
3459 _mesa_glsl_error(&loc
, state
,
3460 "'sample in' cannot be used in a vertex shader");
3463 /* Section 4.3.6 of the GLSL 1.30 specification states:
3464 * "It is an error to use centroid out in a fragment shader."
3466 * The GL_ARB_shading_language_420pack extension specification states:
3467 * "It is an error to use auxiliary storage qualifiers or interpolation
3468 * qualifiers on an output in a fragment shader."
3470 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
3471 this->type
->qualifier
.flags
.q
.out
&&
3472 this->type
->qualifier
.has_auxiliary_storage()) {
3473 _mesa_glsl_error(&loc
, state
,
3474 "auxiliary storage qualifiers cannot be used on "
3475 "fragment shader outputs");
3478 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
3480 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3481 state
->check_precision_qualifiers_allowed(&loc
);
3485 /* Precision qualifiers apply to floating point, integer and sampler
3488 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3489 * "Any floating point or any integer declaration can have the type
3490 * preceded by one of these precision qualifiers [...] Literal
3491 * constants do not have precision qualifiers. Neither do Boolean
3494 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3497 * "Precision qualifiers are added for code portability with OpenGL
3498 * ES, not for functionality. They have the same syntax as in OpenGL
3501 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3503 * "uniform lowp sampler2D sampler;
3506 * lowp vec4 col = texture2D (sampler, coord);
3507 * // texture2D returns lowp"
3509 * From this, we infer that GLSL 1.30 (and later) should allow precision
3510 * qualifiers on sampler types just like float and integer types.
3512 if (this->type
->qualifier
.precision
!= ast_precision_none
3513 && !var
->type
->is_float()
3514 && !var
->type
->is_integer()
3515 && !var
->type
->is_record()
3516 && !var
->type
->is_sampler()
3517 && !(var
->type
->is_array()
3518 && (var
->type
->fields
.array
->is_float()
3519 || var
->type
->fields
.array
->is_integer()))) {
3521 _mesa_glsl_error(&loc
, state
,
3522 "precision qualifiers apply only to floating point"
3523 ", integer and sampler types");
3526 /* From section 4.1.7 of the GLSL 4.40 spec:
3528 * "[Opaque types] can only be declared as function
3529 * parameters or uniform-qualified variables."
3531 if (var_type
->contains_opaque() &&
3532 !this->type
->qualifier
.flags
.q
.uniform
) {
3533 _mesa_glsl_error(&loc
, state
,
3534 "opaque variables must be declared uniform");
3537 /* Process the initializer and add its instructions to a temporary
3538 * list. This list will be added to the instruction stream (below) after
3539 * the declaration is added. This is done because in some cases (such as
3540 * redeclarations) the declaration may not actually be added to the
3541 * instruction stream.
3543 exec_list initializer_instructions
;
3544 ir_variable
*earlier
=
3545 get_variable_being_redeclared(var
, decl
->get_location(), state
,
3546 false /* allow_all_redeclarations */);
3547 if (earlier
!= NULL
) {
3548 if (strncmp(var
->name
, "gl_", 3) == 0 &&
3549 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
3550 _mesa_glsl_error(&loc
, state
,
3551 "`%s' has already been redeclared using "
3552 "gl_PerVertex", var
->name
);
3554 earlier
->data
.how_declared
= ir_var_declared_normally
;
3557 if (decl
->initializer
!= NULL
) {
3558 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3560 &initializer_instructions
, state
);
3563 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3565 * "It is an error to write to a const variable outside of
3566 * its declaration, so they must be initialized when
3569 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3570 _mesa_glsl_error(& loc
, state
,
3571 "const declaration of `%s' must be initialized",
3575 if (state
->es_shader
) {
3576 const glsl_type
*const t
= (earlier
== NULL
)
3577 ? var
->type
: earlier
->type
;
3579 if (t
->is_unsized_array())
3580 /* Section 10.17 of the GLSL ES 1.00 specification states that
3581 * unsized array declarations have been removed from the language.
3582 * Arrays that are sized using an initializer are still explicitly
3583 * sized. However, GLSL ES 1.00 does not allow array
3584 * initializers. That is only allowed in GLSL ES 3.00.
3586 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
3588 * "An array type can also be formed without specifying a size
3589 * if the definition includes an initializer:
3591 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
3592 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
3597 _mesa_glsl_error(& loc
, state
,
3598 "unsized array declarations are not allowed in "
3602 /* If the declaration is not a redeclaration, there are a few additional
3603 * semantic checks that must be applied. In addition, variable that was
3604 * created for the declaration should be added to the IR stream.
3606 if (earlier
== NULL
) {
3607 validate_identifier(decl
->identifier
, loc
, state
);
3609 /* Add the variable to the symbol table. Note that the initializer's
3610 * IR was already processed earlier (though it hasn't been emitted
3611 * yet), without the variable in scope.
3613 * This differs from most C-like languages, but it follows the GLSL
3614 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3617 * "Within a declaration, the scope of a name starts immediately
3618 * after the initializer if present or immediately after the name
3619 * being declared if not."
3621 if (!state
->symbols
->add_variable(var
)) {
3622 YYLTYPE loc
= this->get_location();
3623 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3624 "current scope", decl
->identifier
);
3628 /* Push the variable declaration to the top. It means that all the
3629 * variable declarations will appear in a funny last-to-first order,
3630 * but otherwise we run into trouble if a function is prototyped, a
3631 * global var is decled, then the function is defined with usage of
3632 * the global var. See glslparsertest's CorrectModule.frag.
3634 instructions
->push_head(var
);
3637 instructions
->append_list(&initializer_instructions
);
3641 /* Generally, variable declarations do not have r-values. However,
3642 * one is used for the declaration in
3644 * while (bool b = some_condition()) {
3648 * so we return the rvalue from the last seen declaration here.
3655 ast_parameter_declarator::hir(exec_list
*instructions
,
3656 struct _mesa_glsl_parse_state
*state
)
3659 const struct glsl_type
*type
;
3660 const char *name
= NULL
;
3661 YYLTYPE loc
= this->get_location();
3663 type
= this->type
->glsl_type(& name
, state
);
3667 _mesa_glsl_error(& loc
, state
,
3668 "invalid type `%s' in declaration of `%s'",
3669 name
, this->identifier
);
3671 _mesa_glsl_error(& loc
, state
,
3672 "invalid type in declaration of `%s'",
3676 type
= glsl_type::error_type
;
3679 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3681 * "Functions that accept no input arguments need not use void in the
3682 * argument list because prototypes (or definitions) are required and
3683 * therefore there is no ambiguity when an empty argument list "( )" is
3684 * declared. The idiom "(void)" as a parameter list is provided for
3687 * Placing this check here prevents a void parameter being set up
3688 * for a function, which avoids tripping up checks for main taking
3689 * parameters and lookups of an unnamed symbol.
3691 if (type
->is_void()) {
3692 if (this->identifier
!= NULL
)
3693 _mesa_glsl_error(& loc
, state
,
3694 "named parameter cannot have type `void'");
3700 if (formal_parameter
&& (this->identifier
== NULL
)) {
3701 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3705 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3706 * call already handled the "vec4[..] foo" case.
3708 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
3710 if (!type
->is_error() && type
->is_unsized_array()) {
3711 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3713 type
= glsl_type::error_type
;
3717 ir_variable
*var
= new(ctx
)
3718 ir_variable(type
, this->identifier
, ir_var_function_in
);
3720 /* Apply any specified qualifiers to the parameter declaration. Note that
3721 * for function parameters the default mode is 'in'.
3723 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3726 /* From section 4.1.7 of the GLSL 4.40 spec:
3728 * "Opaque variables cannot be treated as l-values; hence cannot
3729 * be used as out or inout function parameters, nor can they be
3732 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
3733 && type
->contains_opaque()) {
3734 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
3735 "contain opaque variables");
3736 type
= glsl_type::error_type
;
3739 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3741 * "When calling a function, expressions that do not evaluate to
3742 * l-values cannot be passed to parameters declared as out or inout."
3744 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3746 * "Other binary or unary expressions, non-dereferenced arrays,
3747 * function names, swizzles with repeated fields, and constants
3748 * cannot be l-values."
3750 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3751 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3753 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
3755 && !state
->check_version(120, 100, &loc
,
3756 "arrays cannot be out or inout parameters")) {
3757 type
= glsl_type::error_type
;
3760 instructions
->push_tail(var
);
3762 /* Parameter declarations do not have r-values.
3769 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3771 exec_list
*ir_parameters
,
3772 _mesa_glsl_parse_state
*state
)
3774 ast_parameter_declarator
*void_param
= NULL
;
3777 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3778 param
->formal_parameter
= formal
;
3779 param
->hir(ir_parameters
, state
);
3787 if ((void_param
!= NULL
) && (count
> 1)) {
3788 YYLTYPE loc
= void_param
->get_location();
3790 _mesa_glsl_error(& loc
, state
,
3791 "`void' parameter must be only parameter");
3797 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3799 /* IR invariants disallow function declarations or definitions
3800 * nested within other function definitions. But there is no
3801 * requirement about the relative order of function declarations
3802 * and definitions with respect to one another. So simply insert
3803 * the new ir_function block at the end of the toplevel instruction
3806 state
->toplevel_ir
->push_tail(f
);
3811 ast_function::hir(exec_list
*instructions
,
3812 struct _mesa_glsl_parse_state
*state
)
3815 ir_function
*f
= NULL
;
3816 ir_function_signature
*sig
= NULL
;
3817 exec_list hir_parameters
;
3819 const char *const name
= identifier
;
3821 /* New functions are always added to the top-level IR instruction stream,
3822 * so this instruction list pointer is ignored. See also emit_function
3825 (void) instructions
;
3827 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3829 * "Function declarations (prototypes) cannot occur inside of functions;
3830 * they must be at global scope, or for the built-in functions, outside
3831 * the global scope."
3833 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3835 * "User defined functions may only be defined within the global scope."
3837 * Note that this language does not appear in GLSL 1.10.
3839 if ((state
->current_function
!= NULL
) &&
3840 state
->is_version(120, 100)) {
3841 YYLTYPE loc
= this->get_location();
3842 _mesa_glsl_error(&loc
, state
,
3843 "declaration of function `%s' not allowed within "
3844 "function body", name
);
3847 validate_identifier(name
, this->get_location(), state
);
3849 /* Convert the list of function parameters to HIR now so that they can be
3850 * used below to compare this function's signature with previously seen
3851 * signatures for functions with the same name.
3853 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3855 & hir_parameters
, state
);
3857 const char *return_type_name
;
3858 const glsl_type
*return_type
=
3859 this->return_type
->glsl_type(& return_type_name
, state
);
3862 YYLTYPE loc
= this->get_location();
3863 _mesa_glsl_error(&loc
, state
,
3864 "function `%s' has undeclared return type `%s'",
3865 name
, return_type_name
);
3866 return_type
= glsl_type::error_type
;
3869 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3870 * "No qualifier is allowed on the return type of a function."
3872 if (this->return_type
->has_qualifiers()) {
3873 YYLTYPE loc
= this->get_location();
3874 _mesa_glsl_error(& loc
, state
,
3875 "function `%s' return type has qualifiers", name
);
3878 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
3880 * "Arrays are allowed as arguments and as the return type. In both
3881 * cases, the array must be explicitly sized."
3883 if (return_type
->is_unsized_array()) {
3884 YYLTYPE loc
= this->get_location();
3885 _mesa_glsl_error(& loc
, state
,
3886 "function `%s' return type array must be explicitly "
3890 /* From section 4.1.7 of the GLSL 4.40 spec:
3892 * "[Opaque types] can only be declared as function parameters
3893 * or uniform-qualified variables."
3895 if (return_type
->contains_opaque()) {
3896 YYLTYPE loc
= this->get_location();
3897 _mesa_glsl_error(&loc
, state
,
3898 "function `%s' return type can't contain an opaque type",
3902 /* Verify that this function's signature either doesn't match a previously
3903 * seen signature for a function with the same name, or, if a match is found,
3904 * that the previously seen signature does not have an associated definition.
3906 f
= state
->symbols
->get_function(name
);
3907 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3908 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
3910 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3911 if (badvar
!= NULL
) {
3912 YYLTYPE loc
= this->get_location();
3914 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3915 "qualifiers don't match prototype", name
, badvar
);
3918 if (sig
->return_type
!= return_type
) {
3919 YYLTYPE loc
= this->get_location();
3921 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3922 "match prototype", name
);
3925 if (sig
->is_defined
) {
3926 if (is_definition
) {
3927 YYLTYPE loc
= this->get_location();
3928 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3930 /* We just encountered a prototype that exactly matches a
3931 * function that's already been defined. This is redundant,
3932 * and we should ignore it.
3939 f
= new(ctx
) ir_function(name
);
3940 if (!state
->symbols
->add_function(f
)) {
3941 /* This function name shadows a non-function use of the same name. */
3942 YYLTYPE loc
= this->get_location();
3944 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3945 "non-function", name
);
3949 emit_function(state
, f
);
3952 /* Verify the return type of main() */
3953 if (strcmp(name
, "main") == 0) {
3954 if (! return_type
->is_void()) {
3955 YYLTYPE loc
= this->get_location();
3957 _mesa_glsl_error(& loc
, state
, "main() must return void");
3960 if (!hir_parameters
.is_empty()) {
3961 YYLTYPE loc
= this->get_location();
3963 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3967 /* Finish storing the information about this new function in its signature.
3970 sig
= new(ctx
) ir_function_signature(return_type
);
3971 f
->add_signature(sig
);
3974 sig
->replace_parameters(&hir_parameters
);
3977 /* Function declarations (prototypes) do not have r-values.
3984 ast_function_definition::hir(exec_list
*instructions
,
3985 struct _mesa_glsl_parse_state
*state
)
3987 prototype
->is_definition
= true;
3988 prototype
->hir(instructions
, state
);
3990 ir_function_signature
*signature
= prototype
->signature
;
3991 if (signature
== NULL
)
3994 assert(state
->current_function
== NULL
);
3995 state
->current_function
= signature
;
3996 state
->found_return
= false;
3998 /* Duplicate parameters declared in the prototype as concrete variables.
3999 * Add these to the symbol table.
4001 state
->symbols
->push_scope();
4002 foreach_list(n
, &signature
->parameters
) {
4003 ir_variable
*const var
= ((ir_instruction
*) n
)->as_variable();
4005 assert(var
!= NULL
);
4007 /* The only way a parameter would "exist" is if two parameters have
4010 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
4011 YYLTYPE loc
= this->get_location();
4013 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
4015 state
->symbols
->add_variable(var
);
4019 /* Convert the body of the function to HIR. */
4020 this->body
->hir(&signature
->body
, state
);
4021 signature
->is_defined
= true;
4023 state
->symbols
->pop_scope();
4025 assert(state
->current_function
== signature
);
4026 state
->current_function
= NULL
;
4028 if (!signature
->return_type
->is_void() && !state
->found_return
) {
4029 YYLTYPE loc
= this->get_location();
4030 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
4031 "%s, but no return statement",
4032 signature
->function_name(),
4033 signature
->return_type
->name
);
4036 /* Function definitions do not have r-values.
4043 ast_jump_statement::hir(exec_list
*instructions
,
4044 struct _mesa_glsl_parse_state
*state
)
4051 assert(state
->current_function
);
4053 if (opt_return_value
) {
4054 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
4056 /* The value of the return type can be NULL if the shader says
4057 * 'return foo();' and foo() is a function that returns void.
4059 * NOTE: The GLSL spec doesn't say that this is an error. The type
4060 * of the return value is void. If the return type of the function is
4061 * also void, then this should compile without error. Seriously.
4063 const glsl_type
*const ret_type
=
4064 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
4066 /* Implicit conversions are not allowed for return values prior to
4067 * ARB_shading_language_420pack.
4069 if (state
->current_function
->return_type
!= ret_type
) {
4070 YYLTYPE loc
= this->get_location();
4072 if (state
->ARB_shading_language_420pack_enable
) {
4073 if (!apply_implicit_conversion(state
->current_function
->return_type
,
4075 _mesa_glsl_error(& loc
, state
,
4076 "could not implicitly convert return value "
4077 "to %s, in function `%s'",
4078 state
->current_function
->return_type
->name
,
4079 state
->current_function
->function_name());
4082 _mesa_glsl_error(& loc
, state
,
4083 "`return' with wrong type %s, in function `%s' "
4086 state
->current_function
->function_name(),
4087 state
->current_function
->return_type
->name
);
4089 } else if (state
->current_function
->return_type
->base_type
==
4091 YYLTYPE loc
= this->get_location();
4093 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
4094 * specs add a clarification:
4096 * "A void function can only use return without a return argument, even if
4097 * the return argument has void type. Return statements only accept values:
4100 * void func2() { return func1(); } // illegal return statement"
4102 _mesa_glsl_error(& loc
, state
,
4103 "void functions can only use `return' without a "
4107 inst
= new(ctx
) ir_return(ret
);
4109 if (state
->current_function
->return_type
->base_type
!=
4111 YYLTYPE loc
= this->get_location();
4113 _mesa_glsl_error(& loc
, state
,
4114 "`return' with no value, in function %s returning "
4116 state
->current_function
->function_name());
4118 inst
= new(ctx
) ir_return
;
4121 state
->found_return
= true;
4122 instructions
->push_tail(inst
);
4127 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
4128 YYLTYPE loc
= this->get_location();
4130 _mesa_glsl_error(& loc
, state
,
4131 "`discard' may only appear in a fragment shader");
4133 instructions
->push_tail(new(ctx
) ir_discard
);
4138 if (mode
== ast_continue
&&
4139 state
->loop_nesting_ast
== NULL
) {
4140 YYLTYPE loc
= this->get_location();
4142 _mesa_glsl_error(& loc
, state
,
4143 "continue may only appear in a loop");
4144 } else if (mode
== ast_break
&&
4145 state
->loop_nesting_ast
== NULL
&&
4146 state
->switch_state
.switch_nesting_ast
== NULL
) {
4147 YYLTYPE loc
= this->get_location();
4149 _mesa_glsl_error(& loc
, state
,
4150 "break may only appear in a loop or a switch");
4152 /* For a loop, inline the for loop expression again, since we don't
4153 * know where near the end of the loop body the normal copy of it is
4154 * going to be placed. Same goes for the condition for a do-while
4157 if (state
->loop_nesting_ast
!= NULL
&&
4158 mode
== ast_continue
) {
4159 if (state
->loop_nesting_ast
->rest_expression
) {
4160 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
4163 if (state
->loop_nesting_ast
->mode
==
4164 ast_iteration_statement::ast_do_while
) {
4165 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
4169 if (state
->switch_state
.is_switch_innermost
&&
4170 mode
== ast_break
) {
4171 /* Force break out of switch by setting is_break switch state.
4173 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
4174 ir_dereference_variable
*const deref_is_break_var
=
4175 new(ctx
) ir_dereference_variable(is_break_var
);
4176 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
4177 ir_assignment
*const set_break_var
=
4178 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
4180 instructions
->push_tail(set_break_var
);
4183 ir_loop_jump
*const jump
=
4184 new(ctx
) ir_loop_jump((mode
== ast_break
)
4185 ? ir_loop_jump::jump_break
4186 : ir_loop_jump::jump_continue
);
4187 instructions
->push_tail(jump
);
4194 /* Jump instructions do not have r-values.
4201 ast_selection_statement::hir(exec_list
*instructions
,
4202 struct _mesa_glsl_parse_state
*state
)
4206 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
4208 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
4210 * "Any expression whose type evaluates to a Boolean can be used as the
4211 * conditional expression bool-expression. Vector types are not accepted
4212 * as the expression to if."
4214 * The checks are separated so that higher quality diagnostics can be
4215 * generated for cases where both rules are violated.
4217 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
4218 YYLTYPE loc
= this->condition
->get_location();
4220 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
4224 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
4226 if (then_statement
!= NULL
) {
4227 state
->symbols
->push_scope();
4228 then_statement
->hir(& stmt
->then_instructions
, state
);
4229 state
->symbols
->pop_scope();
4232 if (else_statement
!= NULL
) {
4233 state
->symbols
->push_scope();
4234 else_statement
->hir(& stmt
->else_instructions
, state
);
4235 state
->symbols
->pop_scope();
4238 instructions
->push_tail(stmt
);
4240 /* if-statements do not have r-values.
4247 ast_switch_statement::hir(exec_list
*instructions
,
4248 struct _mesa_glsl_parse_state
*state
)
4252 ir_rvalue
*const test_expression
=
4253 this->test_expression
->hir(instructions
, state
);
4255 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
4257 * "The type of init-expression in a switch statement must be a
4260 if (!test_expression
->type
->is_scalar() ||
4261 !test_expression
->type
->is_integer()) {
4262 YYLTYPE loc
= this->test_expression
->get_location();
4264 _mesa_glsl_error(& loc
,
4266 "switch-statement expression must be scalar "
4270 /* Track the switch-statement nesting in a stack-like manner.
4272 struct glsl_switch_state saved
= state
->switch_state
;
4274 state
->switch_state
.is_switch_innermost
= true;
4275 state
->switch_state
.switch_nesting_ast
= this;
4276 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
4277 hash_table_pointer_compare
);
4278 state
->switch_state
.previous_default
= NULL
;
4280 /* Initalize is_fallthru state to false.
4282 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
4283 state
->switch_state
.is_fallthru_var
=
4284 new(ctx
) ir_variable(glsl_type::bool_type
,
4285 "switch_is_fallthru_tmp",
4287 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
4289 ir_dereference_variable
*deref_is_fallthru_var
=
4290 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4291 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
4294 /* Initalize is_break state to false.
4296 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
4297 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
4298 "switch_is_break_tmp",
4300 instructions
->push_tail(state
->switch_state
.is_break_var
);
4302 ir_dereference_variable
*deref_is_break_var
=
4303 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4304 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
4307 /* Cache test expression.
4309 test_to_hir(instructions
, state
);
4311 /* Emit code for body of switch stmt.
4313 body
->hir(instructions
, state
);
4315 hash_table_dtor(state
->switch_state
.labels_ht
);
4317 state
->switch_state
= saved
;
4319 /* Switch statements do not have r-values. */
4325 ast_switch_statement::test_to_hir(exec_list
*instructions
,
4326 struct _mesa_glsl_parse_state
*state
)
4330 /* Cache value of test expression. */
4331 ir_rvalue
*const test_val
=
4332 test_expression
->hir(instructions
,
4335 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
4338 ir_dereference_variable
*deref_test_var
=
4339 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4341 instructions
->push_tail(state
->switch_state
.test_var
);
4342 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
4347 ast_switch_body::hir(exec_list
*instructions
,
4348 struct _mesa_glsl_parse_state
*state
)
4351 stmts
->hir(instructions
, state
);
4353 /* Switch bodies do not have r-values. */
4358 ast_case_statement_list::hir(exec_list
*instructions
,
4359 struct _mesa_glsl_parse_state
*state
)
4361 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
4362 case_stmt
->hir(instructions
, state
);
4364 /* Case statements do not have r-values. */
4369 ast_case_statement::hir(exec_list
*instructions
,
4370 struct _mesa_glsl_parse_state
*state
)
4372 labels
->hir(instructions
, state
);
4374 /* Conditionally set fallthru state based on break state. */
4375 ir_constant
*const false_val
= new(state
) ir_constant(false);
4376 ir_dereference_variable
*const deref_is_fallthru_var
=
4377 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4378 ir_dereference_variable
*const deref_is_break_var
=
4379 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4380 ir_assignment
*const reset_fallthru_on_break
=
4381 new(state
) ir_assignment(deref_is_fallthru_var
,
4383 deref_is_break_var
);
4384 instructions
->push_tail(reset_fallthru_on_break
);
4386 /* Guard case statements depending on fallthru state. */
4387 ir_dereference_variable
*const deref_fallthru_guard
=
4388 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4389 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
4391 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
4392 stmt
->hir(& test_fallthru
->then_instructions
, state
);
4394 instructions
->push_tail(test_fallthru
);
4396 /* Case statements do not have r-values. */
4402 ast_case_label_list::hir(exec_list
*instructions
,
4403 struct _mesa_glsl_parse_state
*state
)
4405 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
4406 label
->hir(instructions
, state
);
4408 /* Case labels do not have r-values. */
4413 ast_case_label::hir(exec_list
*instructions
,
4414 struct _mesa_glsl_parse_state
*state
)
4418 ir_dereference_variable
*deref_fallthru_var
=
4419 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4421 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
4423 /* If not default case, ... */
4424 if (this->test_value
!= NULL
) {
4425 /* Conditionally set fallthru state based on
4426 * comparison of cached test expression value to case label.
4428 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
4429 ir_constant
*label_const
= label_rval
->constant_expression_value();
4432 YYLTYPE loc
= this->test_value
->get_location();
4434 _mesa_glsl_error(& loc
, state
,
4435 "switch statement case label must be a "
4436 "constant expression");
4438 /* Stuff a dummy value in to allow processing to continue. */
4439 label_const
= new(ctx
) ir_constant(0);
4441 ast_expression
*previous_label
= (ast_expression
*)
4442 hash_table_find(state
->switch_state
.labels_ht
,
4443 (void *)(uintptr_t)label_const
->value
.u
[0]);
4445 if (previous_label
) {
4446 YYLTYPE loc
= this->test_value
->get_location();
4447 _mesa_glsl_error(& loc
, state
,
4448 "duplicate case value");
4450 loc
= previous_label
->get_location();
4451 _mesa_glsl_error(& loc
, state
,
4452 "this is the previous case label");
4454 hash_table_insert(state
->switch_state
.labels_ht
,
4456 (void *)(uintptr_t)label_const
->value
.u
[0]);
4460 ir_dereference_variable
*deref_test_var
=
4461 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4463 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4467 ir_assignment
*set_fallthru_on_test
=
4468 new(ctx
) ir_assignment(deref_fallthru_var
,
4472 instructions
->push_tail(set_fallthru_on_test
);
4473 } else { /* default case */
4474 if (state
->switch_state
.previous_default
) {
4475 YYLTYPE loc
= this->get_location();
4476 _mesa_glsl_error(& loc
, state
,
4477 "multiple default labels in one switch");
4479 loc
= state
->switch_state
.previous_default
->get_location();
4480 _mesa_glsl_error(& loc
, state
,
4481 "this is the first default label");
4483 state
->switch_state
.previous_default
= this;
4485 /* Set falltrhu state. */
4486 ir_assignment
*set_fallthru
=
4487 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
4489 instructions
->push_tail(set_fallthru
);
4492 /* Case statements do not have r-values. */
4497 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
4498 struct _mesa_glsl_parse_state
*state
)
4502 if (condition
!= NULL
) {
4503 ir_rvalue
*const cond
=
4504 condition
->hir(instructions
, state
);
4507 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
4508 YYLTYPE loc
= condition
->get_location();
4510 _mesa_glsl_error(& loc
, state
,
4511 "loop condition must be scalar boolean");
4513 /* As the first code in the loop body, generate a block that looks
4514 * like 'if (!condition) break;' as the loop termination condition.
4516 ir_rvalue
*const not_cond
=
4517 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
4519 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
4521 ir_jump
*const break_stmt
=
4522 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4524 if_stmt
->then_instructions
.push_tail(break_stmt
);
4525 instructions
->push_tail(if_stmt
);
4532 ast_iteration_statement::hir(exec_list
*instructions
,
4533 struct _mesa_glsl_parse_state
*state
)
4537 /* For-loops and while-loops start a new scope, but do-while loops do not.
4539 if (mode
!= ast_do_while
)
4540 state
->symbols
->push_scope();
4542 if (init_statement
!= NULL
)
4543 init_statement
->hir(instructions
, state
);
4545 ir_loop
*const stmt
= new(ctx
) ir_loop();
4546 instructions
->push_tail(stmt
);
4548 /* Track the current loop nesting. */
4549 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
4551 state
->loop_nesting_ast
= this;
4553 /* Likewise, indicate that following code is closest to a loop,
4554 * NOT closest to a switch.
4556 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
4557 state
->switch_state
.is_switch_innermost
= false;
4559 if (mode
!= ast_do_while
)
4560 condition_to_hir(&stmt
->body_instructions
, state
);
4563 body
->hir(& stmt
->body_instructions
, state
);
4565 if (rest_expression
!= NULL
)
4566 rest_expression
->hir(& stmt
->body_instructions
, state
);
4568 if (mode
== ast_do_while
)
4569 condition_to_hir(&stmt
->body_instructions
, state
);
4571 if (mode
!= ast_do_while
)
4572 state
->symbols
->pop_scope();
4574 /* Restore previous nesting before returning. */
4575 state
->loop_nesting_ast
= nesting_ast
;
4576 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
4578 /* Loops do not have r-values.
4585 * Determine if the given type is valid for establishing a default precision
4588 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4590 * "The precision statement
4592 * precision precision-qualifier type;
4594 * can be used to establish a default precision qualifier. The type field
4595 * can be either int or float or any of the sampler types, and the
4596 * precision-qualifier can be lowp, mediump, or highp."
4598 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4599 * qualifiers on sampler types, but this seems like an oversight (since the
4600 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4601 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4605 is_valid_default_precision_type(const struct glsl_type
*const type
)
4610 switch (type
->base_type
) {
4612 case GLSL_TYPE_FLOAT
:
4613 /* "int" and "float" are valid, but vectors and matrices are not. */
4614 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4615 case GLSL_TYPE_SAMPLER
:
4624 ast_type_specifier::hir(exec_list
*instructions
,
4625 struct _mesa_glsl_parse_state
*state
)
4627 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
4630 YYLTYPE loc
= this->get_location();
4632 /* If this is a precision statement, check that the type to which it is
4633 * applied is either float or int.
4635 * From section 4.5.3 of the GLSL 1.30 spec:
4636 * "The precision statement
4637 * precision precision-qualifier type;
4638 * can be used to establish a default precision qualifier. The type
4639 * field can be either int or float [...]. Any other types or
4640 * qualifiers will result in an error.
4642 if (this->default_precision
!= ast_precision_none
) {
4643 if (!state
->check_precision_qualifiers_allowed(&loc
))
4646 if (this->structure
!= NULL
) {
4647 _mesa_glsl_error(&loc
, state
,
4648 "precision qualifiers do not apply to structures");
4652 if (this->array_specifier
!= NULL
) {
4653 _mesa_glsl_error(&loc
, state
,
4654 "default precision statements do not apply to "
4659 const struct glsl_type
*const type
=
4660 state
->symbols
->get_type(this->type_name
);
4661 if (!is_valid_default_precision_type(type
)) {
4662 _mesa_glsl_error(&loc
, state
,
4663 "default precision statements apply only to "
4664 "float, int, and sampler types");
4668 if (type
->base_type
== GLSL_TYPE_FLOAT
4670 && state
->stage
== MESA_SHADER_FRAGMENT
) {
4671 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
4674 * "The fragment language has no default precision qualifier for
4675 * floating point types."
4677 * As a result, we have to track whether or not default precision has
4678 * been specified for float in GLSL ES fragment shaders.
4680 * Earlier in that same section, the spec says:
4682 * "Non-precision qualified declarations will use the precision
4683 * qualifier specified in the most recent precision statement
4684 * that is still in scope. The precision statement has the same
4685 * scoping rules as variable declarations. If it is declared
4686 * inside a compound statement, its effect stops at the end of
4687 * the innermost statement it was declared in. Precision
4688 * statements in nested scopes override precision statements in
4689 * outer scopes. Multiple precision statements for the same basic
4690 * type can appear inside the same scope, with later statements
4691 * overriding earlier statements within that scope."
4693 * Default precision specifications follow the same scope rules as
4694 * variables. So, we can track the state of the default float
4695 * precision in the symbol table, and the rules will just work. This
4696 * is a slight abuse of the symbol table, but it has the semantics
4699 ir_variable
*const junk
=
4700 new(state
) ir_variable(type
, "#default precision",
4703 state
->symbols
->add_variable(junk
);
4706 /* FINISHME: Translate precision statements into IR. */
4710 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
4711 * process_record_constructor() can do type-checking on C-style initializer
4712 * expressions of structs, but ast_struct_specifier should only be translated
4713 * to HIR if it is declaring the type of a structure.
4715 * The ->is_declaration field is false for initializers of variables
4716 * declared separately from the struct's type definition.
4718 * struct S { ... }; (is_declaration = true)
4719 * struct T { ... } t = { ... }; (is_declaration = true)
4720 * S s = { ... }; (is_declaration = false)
4722 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
4723 return this->structure
->hir(instructions
, state
);
4730 * Process a structure or interface block tree into an array of structure fields
4732 * After parsing, where there are some syntax differnces, structures and
4733 * interface blocks are almost identical. They are similar enough that the
4734 * AST for each can be processed the same way into a set of
4735 * \c glsl_struct_field to describe the members.
4737 * If we're processing an interface block, var_mode should be the type of the
4738 * interface block (ir_var_shader_in, ir_var_shader_out, or ir_var_uniform).
4739 * If we're processing a structure, var_mode should be ir_var_auto.
4742 * The number of fields processed. A pointer to the array structure fields is
4743 * stored in \c *fields_ret.
4746 ast_process_structure_or_interface_block(exec_list
*instructions
,
4747 struct _mesa_glsl_parse_state
*state
,
4748 exec_list
*declarations
,
4750 glsl_struct_field
**fields_ret
,
4752 bool block_row_major
,
4753 bool allow_reserved_names
,
4754 ir_variable_mode var_mode
)
4756 unsigned decl_count
= 0;
4758 /* Make an initial pass over the list of fields to determine how
4759 * many there are. Each element in this list is an ast_declarator_list.
4760 * This means that we actually need to count the number of elements in the
4761 * 'declarations' list in each of the elements.
4763 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4764 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4769 /* Allocate storage for the fields and process the field
4770 * declarations. As the declarations are processed, try to also convert
4771 * the types to HIR. This ensures that structure definitions embedded in
4772 * other structure definitions or in interface blocks are processed.
4774 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4778 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4779 const char *type_name
;
4781 decl_list
->type
->specifier
->hir(instructions
, state
);
4783 /* Section 10.9 of the GLSL ES 1.00 specification states that
4784 * embedded structure definitions have been removed from the language.
4786 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4787 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
4788 "not allowed in GLSL ES 1.00");
4791 const glsl_type
*decl_type
=
4792 decl_list
->type
->glsl_type(& type_name
, state
);
4794 foreach_list_typed (ast_declaration
, decl
, link
,
4795 &decl_list
->declarations
) {
4796 if (!allow_reserved_names
)
4797 validate_identifier(decl
->identifier
, loc
, state
);
4799 /* From section 4.3.9 of the GLSL 4.40 spec:
4801 * "[In interface blocks] opaque types are not allowed."
4803 * It should be impossible for decl_type to be NULL here. Cases that
4804 * might naturally lead to decl_type being NULL, especially for the
4805 * is_interface case, will have resulted in compilation having
4806 * already halted due to a syntax error.
4808 const struct glsl_type
*field_type
=
4809 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4811 if (is_interface
&& field_type
->contains_opaque()) {
4812 YYLTYPE loc
= decl_list
->get_location();
4813 _mesa_glsl_error(&loc
, state
,
4814 "uniform in non-default uniform block contains "
4818 if (field_type
->contains_atomic()) {
4819 /* FINISHME: Add a spec quotation here once updated spec
4820 * FINISHME: language is available. See Khronos bug #10903
4821 * FINISHME: on whether atomic counters are allowed in
4822 * FINISHME: structures.
4824 YYLTYPE loc
= decl_list
->get_location();
4825 _mesa_glsl_error(&loc
, state
, "atomic counter in structure or "
4829 if (field_type
->contains_image()) {
4830 /* FINISHME: Same problem as with atomic counters.
4831 * FINISHME: Request clarification from Khronos and add
4832 * FINISHME: spec quotation here.
4834 YYLTYPE loc
= decl_list
->get_location();
4835 _mesa_glsl_error(&loc
, state
,
4836 "image in structure or uniform block");
4839 const struct ast_type_qualifier
*const qual
=
4840 & decl_list
->type
->qualifier
;
4841 if (qual
->flags
.q
.std140
||
4842 qual
->flags
.q
.packed
||
4843 qual
->flags
.q
.shared
) {
4844 _mesa_glsl_error(&loc
, state
,
4845 "uniform block layout qualifiers std140, packed, and "
4846 "shared can only be applied to uniform blocks, not "
4850 field_type
= process_array_type(&loc
, decl_type
,
4851 decl
->array_specifier
, state
);
4852 fields
[i
].type
= field_type
;
4853 fields
[i
].name
= decl
->identifier
;
4854 fields
[i
].location
= -1;
4855 fields
[i
].interpolation
=
4856 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
4857 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
4858 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
4860 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4861 if (!qual
->flags
.q
.uniform
) {
4862 _mesa_glsl_error(&loc
, state
,
4863 "row_major and column_major can only be "
4864 "applied to uniform interface blocks");
4866 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
4869 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
4870 _mesa_glsl_error(&loc
, state
,
4871 "interpolation qualifiers cannot be used "
4872 "with uniform interface blocks");
4875 if (field_type
->is_matrix() ||
4876 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4877 fields
[i
].row_major
= block_row_major
;
4878 if (qual
->flags
.q
.row_major
)
4879 fields
[i
].row_major
= true;
4880 else if (qual
->flags
.q
.column_major
)
4881 fields
[i
].row_major
= false;
4888 assert(i
== decl_count
);
4890 *fields_ret
= fields
;
4896 ast_struct_specifier::hir(exec_list
*instructions
,
4897 struct _mesa_glsl_parse_state
*state
)
4899 YYLTYPE loc
= this->get_location();
4901 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
4903 * "Anonymous structures are not supported; so embedded structures must
4904 * have a declarator. A name given to an embedded struct is scoped at
4905 * the same level as the struct it is embedded in."
4907 * The same section of the GLSL 1.20 spec says:
4909 * "Anonymous structures are not supported. Embedded structures are not
4912 * struct S { float f; };
4914 * S; // Error: anonymous structures disallowed
4915 * struct { ... }; // Error: embedded structures disallowed
4916 * S s; // Okay: nested structures with name are allowed
4919 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
4920 * we allow embedded structures in 1.10 only.
4922 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
4923 _mesa_glsl_error(&loc
, state
,
4924 "embedded structure declartions are not allowed");
4926 state
->struct_specifier_depth
++;
4928 glsl_struct_field
*fields
;
4929 unsigned decl_count
=
4930 ast_process_structure_or_interface_block(instructions
,
4932 &this->declarations
,
4937 false /* allow_reserved_names */,
4940 validate_identifier(this->name
, loc
, state
);
4942 const glsl_type
*t
=
4943 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4945 if (!state
->symbols
->add_type(name
, t
)) {
4946 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4948 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4950 state
->num_user_structures
+ 1);
4952 s
[state
->num_user_structures
] = t
;
4953 state
->user_structures
= s
;
4954 state
->num_user_structures
++;
4958 state
->struct_specifier_depth
--;
4960 /* Structure type definitions do not have r-values.
4967 * Visitor class which detects whether a given interface block has been used.
4969 class interface_block_usage_visitor
: public ir_hierarchical_visitor
4972 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
4973 : mode(mode
), block(block
), found(false)
4977 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
4979 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
4983 return visit_continue
;
4986 bool usage_found() const
4992 ir_variable_mode mode
;
4993 const glsl_type
*block
;
4999 ast_interface_block::hir(exec_list
*instructions
,
5000 struct _mesa_glsl_parse_state
*state
)
5002 YYLTYPE loc
= this->get_location();
5004 /* The ast_interface_block has a list of ast_declarator_lists. We
5005 * need to turn those into ir_variables with an association
5006 * with this uniform block.
5008 enum glsl_interface_packing packing
;
5009 if (this->layout
.flags
.q
.shared
) {
5010 packing
= GLSL_INTERFACE_PACKING_SHARED
;
5011 } else if (this->layout
.flags
.q
.packed
) {
5012 packing
= GLSL_INTERFACE_PACKING_PACKED
;
5014 /* The default layout is std140.
5016 packing
= GLSL_INTERFACE_PACKING_STD140
;
5019 ir_variable_mode var_mode
;
5020 const char *iface_type_name
;
5021 if (this->layout
.flags
.q
.in
) {
5022 var_mode
= ir_var_shader_in
;
5023 iface_type_name
= "in";
5024 } else if (this->layout
.flags
.q
.out
) {
5025 var_mode
= ir_var_shader_out
;
5026 iface_type_name
= "out";
5027 } else if (this->layout
.flags
.q
.uniform
) {
5028 var_mode
= ir_var_uniform
;
5029 iface_type_name
= "uniform";
5031 var_mode
= ir_var_auto
;
5032 iface_type_name
= "UNKNOWN";
5033 assert(!"interface block layout qualifier not found!");
5036 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
5037 bool block_row_major
= this->layout
.flags
.q
.row_major
;
5038 exec_list declared_variables
;
5039 glsl_struct_field
*fields
;
5040 unsigned int num_variables
=
5041 ast_process_structure_or_interface_block(&declared_variables
,
5043 &this->declarations
,
5048 redeclaring_per_vertex
,
5051 if (!redeclaring_per_vertex
)
5052 validate_identifier(this->block_name
, loc
, state
);
5054 const glsl_type
*earlier_per_vertex
= NULL
;
5055 if (redeclaring_per_vertex
) {
5056 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
5057 * the named interface block gl_in, we can find it by looking at the
5058 * previous declaration of gl_in. Otherwise we can find it by looking
5059 * at the previous decalartion of any of the built-in outputs,
5062 * Also check that the instance name and array-ness of the redeclaration
5066 case ir_var_shader_in
:
5067 if (ir_variable
*earlier_gl_in
=
5068 state
->symbols
->get_variable("gl_in")) {
5069 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
5071 _mesa_glsl_error(&loc
, state
,
5072 "redeclaration of gl_PerVertex input not allowed "
5074 _mesa_shader_stage_to_string(state
->stage
));
5076 if (this->instance_name
== NULL
||
5077 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
) {
5078 _mesa_glsl_error(&loc
, state
,
5079 "gl_PerVertex input must be redeclared as "
5083 case ir_var_shader_out
:
5084 if (ir_variable
*earlier_gl_Position
=
5085 state
->symbols
->get_variable("gl_Position")) {
5086 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
5088 _mesa_glsl_error(&loc
, state
,
5089 "redeclaration of gl_PerVertex output not "
5090 "allowed in the %s shader",
5091 _mesa_shader_stage_to_string(state
->stage
));
5093 if (this->instance_name
!= NULL
) {
5094 _mesa_glsl_error(&loc
, state
,
5095 "gl_PerVertex input may not be redeclared with "
5096 "an instance name");
5100 _mesa_glsl_error(&loc
, state
,
5101 "gl_PerVertex must be declared as an input or an "
5106 if (earlier_per_vertex
== NULL
) {
5107 /* An error has already been reported. Bail out to avoid null
5108 * dereferences later in this function.
5113 /* Copy locations from the old gl_PerVertex interface block. */
5114 for (unsigned i
= 0; i
< num_variables
; i
++) {
5115 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
5117 _mesa_glsl_error(&loc
, state
,
5118 "redeclaration of gl_PerVertex must be a subset "
5119 "of the built-in members of gl_PerVertex");
5121 fields
[i
].location
=
5122 earlier_per_vertex
->fields
.structure
[j
].location
;
5123 fields
[i
].interpolation
=
5124 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
5125 fields
[i
].centroid
=
5126 earlier_per_vertex
->fields
.structure
[j
].centroid
;
5128 earlier_per_vertex
->fields
.structure
[j
].sample
;
5132 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
5135 * If a built-in interface block is redeclared, it must appear in
5136 * the shader before any use of any member included in the built-in
5137 * declaration, or a compilation error will result.
5139 * This appears to be a clarification to the behaviour established for
5140 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
5141 * regardless of GLSL version.
5143 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
5144 v
.run(instructions
);
5145 if (v
.usage_found()) {
5146 _mesa_glsl_error(&loc
, state
,
5147 "redeclaration of a built-in interface block must "
5148 "appear before any use of any member of the "
5153 const glsl_type
*block_type
=
5154 glsl_type::get_interface_instance(fields
,
5159 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
5160 YYLTYPE loc
= this->get_location();
5161 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
5162 "already taken in the current scope",
5163 this->block_name
, iface_type_name
);
5166 /* Since interface blocks cannot contain statements, it should be
5167 * impossible for the block to generate any instructions.
5169 assert(declared_variables
.is_empty());
5171 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5173 * Geometry shader input variables get the per-vertex values written
5174 * out by vertex shader output variables of the same names. Since a
5175 * geometry shader operates on a set of vertices, each input varying
5176 * variable (or input block, see interface blocks below) needs to be
5177 * declared as an array.
5179 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
5180 var_mode
== ir_var_shader_in
) {
5181 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
5184 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
5187 * "If an instance name (instance-name) is used, then it puts all the
5188 * members inside a scope within its own name space, accessed with the
5189 * field selector ( . ) operator (analogously to structures)."
5191 if (this->instance_name
) {
5192 if (redeclaring_per_vertex
) {
5193 /* When a built-in in an unnamed interface block is redeclared,
5194 * get_variable_being_redeclared() calls
5195 * check_builtin_array_max_size() to make sure that built-in array
5196 * variables aren't redeclared to illegal sizes. But we're looking
5197 * at a redeclaration of a named built-in interface block. So we
5198 * have to manually call check_builtin_array_max_size() for all parts
5199 * of the interface that are arrays.
5201 for (unsigned i
= 0; i
< num_variables
; i
++) {
5202 if (fields
[i
].type
->is_array()) {
5203 const unsigned size
= fields
[i
].type
->array_size();
5204 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
5208 validate_identifier(this->instance_name
, loc
, state
);
5213 if (this->array_specifier
!= NULL
) {
5214 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
5216 * For uniform blocks declared an array, each individual array
5217 * element corresponds to a separate buffer object backing one
5218 * instance of the block. As the array size indicates the number
5219 * of buffer objects needed, uniform block array declarations
5220 * must specify an array size.
5222 * And a few paragraphs later:
5224 * Geometry shader input blocks must be declared as arrays and
5225 * follow the array declaration and linking rules for all
5226 * geometry shader inputs. All other input and output block
5227 * arrays must specify an array size.
5229 * The upshot of this is that the only circumstance where an
5230 * interface array size *doesn't* need to be specified is on a
5231 * geometry shader input.
5233 if (this->array_specifier
->is_unsized_array
&&
5234 (state
->stage
!= MESA_SHADER_GEOMETRY
|| !this->layout
.flags
.q
.in
)) {
5235 _mesa_glsl_error(&loc
, state
,
5236 "only geometry shader inputs may be unsized "
5237 "instance block arrays");
5241 const glsl_type
*block_array_type
=
5242 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
5244 var
= new(state
) ir_variable(block_array_type
,
5245 this->instance_name
,
5248 var
= new(state
) ir_variable(block_type
,
5249 this->instance_name
,
5253 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
5254 handle_geometry_shader_input_decl(state
, loc
, var
);
5256 if (ir_variable
*earlier
=
5257 state
->symbols
->get_variable(this->instance_name
)) {
5258 if (!redeclaring_per_vertex
) {
5259 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
5260 this->instance_name
);
5262 earlier
->data
.how_declared
= ir_var_declared_normally
;
5263 earlier
->type
= var
->type
;
5264 earlier
->reinit_interface_type(block_type
);
5267 state
->symbols
->add_variable(var
);
5268 instructions
->push_tail(var
);
5271 /* In order to have an array size, the block must also be declared with
5274 assert(this->array_specifier
== NULL
);
5276 for (unsigned i
= 0; i
< num_variables
; i
++) {
5278 new(state
) ir_variable(fields
[i
].type
,
5279 ralloc_strdup(state
, fields
[i
].name
),
5281 var
->data
.interpolation
= fields
[i
].interpolation
;
5282 var
->data
.centroid
= fields
[i
].centroid
;
5283 var
->data
.sample
= fields
[i
].sample
;
5284 var
->init_interface_type(block_type
);
5286 if (redeclaring_per_vertex
) {
5287 ir_variable
*earlier
=
5288 get_variable_being_redeclared(var
, loc
, state
,
5289 true /* allow_all_redeclarations */);
5290 if (strncmp(var
->name
, "gl_", 3) != 0 || earlier
== NULL
) {
5291 _mesa_glsl_error(&loc
, state
,
5292 "redeclaration of gl_PerVertex can only "
5293 "include built-in variables");
5294 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
5295 _mesa_glsl_error(&loc
, state
,
5296 "`%s' has already been redeclared", var
->name
);
5298 earlier
->data
.how_declared
= ir_var_declared_in_block
;
5299 earlier
->reinit_interface_type(block_type
);
5304 if (state
->symbols
->get_variable(var
->name
) != NULL
)
5305 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
5307 /* Propagate the "binding" keyword into this UBO's fields;
5308 * the UBO declaration itself doesn't get an ir_variable unless it
5309 * has an instance name. This is ugly.
5311 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5312 var
->data
.binding
= this->layout
.binding
;
5314 state
->symbols
->add_variable(var
);
5315 instructions
->push_tail(var
);
5318 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
5319 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
5321 * It is also a compilation error ... to redeclare a built-in
5322 * block and then use a member from that built-in block that was
5323 * not included in the redeclaration.
5325 * This appears to be a clarification to the behaviour established
5326 * for gl_PerVertex by GLSL 1.50, therefore we implement this
5327 * behaviour regardless of GLSL version.
5329 * To prevent the shader from using a member that was not included in
5330 * the redeclaration, we disable any ir_variables that are still
5331 * associated with the old declaration of gl_PerVertex (since we've
5332 * already updated all of the variables contained in the new
5333 * gl_PerVertex to point to it).
5335 * As a side effect this will prevent
5336 * validate_intrastage_interface_blocks() from getting confused and
5337 * thinking there are conflicting definitions of gl_PerVertex in the
5340 foreach_list_safe(node
, instructions
) {
5341 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5343 var
->get_interface_type() == earlier_per_vertex
&&
5344 var
->data
.mode
== var_mode
) {
5345 if (var
->data
.how_declared
== ir_var_declared_normally
) {
5346 _mesa_glsl_error(&loc
, state
,
5347 "redeclaration of gl_PerVertex cannot "
5348 "follow a redeclaration of `%s'",
5351 state
->symbols
->disable_variable(var
->name
);
5363 ast_gs_input_layout::hir(exec_list
*instructions
,
5364 struct _mesa_glsl_parse_state
*state
)
5366 YYLTYPE loc
= this->get_location();
5368 /* If any geometry input layout declaration preceded this one, make sure it
5369 * was consistent with this one.
5371 if (state
->gs_input_prim_type_specified
&&
5372 state
->in_qualifier
->prim_type
!= this->prim_type
) {
5373 _mesa_glsl_error(&loc
, state
,
5374 "geometry shader input layout does not match"
5375 " previous declaration");
5379 /* If any shader inputs occurred before this declaration and specified an
5380 * array size, make sure the size they specified is consistent with the
5383 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
5384 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
5385 _mesa_glsl_error(&loc
, state
,
5386 "this geometry shader input layout implies %u vertices"
5387 " per primitive, but a previous input is declared"
5388 " with size %u", num_vertices
, state
->gs_input_size
);
5392 state
->gs_input_prim_type_specified
= true;
5394 /* If any shader inputs occurred before this declaration and did not
5395 * specify an array size, their size is determined now.
5397 foreach_list (node
, instructions
) {
5398 ir_variable
*var
= ((ir_instruction
*) node
)->as_variable();
5399 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
5402 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
5406 if (var
->type
->is_unsized_array()) {
5407 if (var
->data
.max_array_access
>= num_vertices
) {
5408 _mesa_glsl_error(&loc
, state
,
5409 "this geometry shader input layout implies %u"
5410 " vertices, but an access to element %u of input"
5411 " `%s' already exists", num_vertices
,
5412 var
->data
.max_array_access
, var
->name
);
5414 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
5425 ast_cs_input_layout::hir(exec_list
*instructions
,
5426 struct _mesa_glsl_parse_state
*state
)
5428 YYLTYPE loc
= this->get_location();
5430 /* If any compute input layout declaration preceded this one, make sure it
5431 * was consistent with this one.
5433 if (state
->cs_input_local_size_specified
) {
5434 for (int i
= 0; i
< 3; i
++) {
5435 if (state
->cs_input_local_size
[i
] != this->local_size
[i
]) {
5436 _mesa_glsl_error(&loc
, state
,
5437 "compute shader input layout does not match"
5438 " previous declaration");
5444 /* From the ARB_compute_shader specification:
5446 * If the local size of the shader in any dimension is greater
5447 * than the maximum size supported by the implementation for that
5448 * dimension, a compile-time error results.
5450 * It is not clear from the spec how the error should be reported if
5451 * the total size of the work group exceeds
5452 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
5453 * report it at compile time as well.
5455 GLuint64 total_invocations
= 1;
5456 for (int i
= 0; i
< 3; i
++) {
5457 if (this->local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
5458 _mesa_glsl_error(&loc
, state
,
5459 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
5461 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
5464 total_invocations
*= this->local_size
[i
];
5465 if (total_invocations
>
5466 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
5467 _mesa_glsl_error(&loc
, state
,
5468 "product of local_sizes exceeds "
5469 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
5470 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
5475 state
->cs_input_local_size_specified
= true;
5476 for (int i
= 0; i
< 3; i
++)
5477 state
->cs_input_local_size
[i
] = this->local_size
[i
];
5479 /* We may now declare the built-in constant gl_WorkGroupSize (see
5480 * builtin_variable_generator::generate_constants() for why we didn't
5481 * declare it earlier).
5483 ir_variable
*var
= new(state
->symbols
)
5484 ir_variable(glsl_type::ivec3_type
, "gl_WorkGroupSize", ir_var_auto
);
5485 var
->data
.how_declared
= ir_var_declared_implicitly
;
5486 var
->data
.read_only
= true;
5487 instructions
->push_tail(var
);
5488 state
->symbols
->add_variable(var
);
5489 ir_constant_data data
;
5490 memset(&data
, 0, sizeof(data
));
5491 for (int i
= 0; i
< 3; i
++)
5492 data
.i
[i
] = this->local_size
[i
];
5493 var
->constant_value
= new(var
) ir_constant(glsl_type::ivec3_type
, &data
);
5494 var
->constant_initializer
=
5495 new(var
) ir_constant(glsl_type::ivec3_type
, &data
);
5496 var
->data
.has_initializer
= true;
5503 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
5504 exec_list
*instructions
)
5506 bool gl_FragColor_assigned
= false;
5507 bool gl_FragData_assigned
= false;
5508 bool user_defined_fs_output_assigned
= false;
5509 ir_variable
*user_defined_fs_output
= NULL
;
5511 /* It would be nice to have proper location information. */
5513 memset(&loc
, 0, sizeof(loc
));
5515 foreach_list(node
, instructions
) {
5516 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
5518 if (!var
|| !var
->data
.assigned
)
5521 if (strcmp(var
->name
, "gl_FragColor") == 0)
5522 gl_FragColor_assigned
= true;
5523 else if (strcmp(var
->name
, "gl_FragData") == 0)
5524 gl_FragData_assigned
= true;
5525 else if (strncmp(var
->name
, "gl_", 3) != 0) {
5526 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
5527 var
->data
.mode
== ir_var_shader_out
) {
5528 user_defined_fs_output_assigned
= true;
5529 user_defined_fs_output
= var
;
5534 /* From the GLSL 1.30 spec:
5536 * "If a shader statically assigns a value to gl_FragColor, it
5537 * may not assign a value to any element of gl_FragData. If a
5538 * shader statically writes a value to any element of
5539 * gl_FragData, it may not assign a value to
5540 * gl_FragColor. That is, a shader may assign values to either
5541 * gl_FragColor or gl_FragData, but not both. Multiple shaders
5542 * linked together must also consistently write just one of
5543 * these variables. Similarly, if user declared output
5544 * variables are in use (statically assigned to), then the
5545 * built-in variables gl_FragColor and gl_FragData may not be
5546 * assigned to. These incorrect usages all generate compile
5549 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
5550 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5551 "`gl_FragColor' and `gl_FragData'");
5552 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
5553 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5554 "`gl_FragColor' and `%s'",
5555 user_defined_fs_output
->name
);
5556 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
5557 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5558 "`gl_FragData' and `%s'",
5559 user_defined_fs_output
->name
);
5565 remove_per_vertex_blocks(exec_list
*instructions
,
5566 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
5568 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
5569 * if it exists in this shader type.
5571 const glsl_type
*per_vertex
= NULL
;
5573 case ir_var_shader_in
:
5574 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
5575 per_vertex
= gl_in
->get_interface_type();
5577 case ir_var_shader_out
:
5578 if (ir_variable
*gl_Position
=
5579 state
->symbols
->get_variable("gl_Position")) {
5580 per_vertex
= gl_Position
->get_interface_type();
5584 assert(!"Unexpected mode");
5588 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
5589 * need to do anything.
5591 if (per_vertex
== NULL
)
5594 /* If the interface block is used by the shader, then we don't need to do
5597 interface_block_usage_visitor
v(mode
, per_vertex
);
5598 v
.run(instructions
);
5599 if (v
.usage_found())
5602 /* Remove any ir_variable declarations that refer to the interface block
5605 foreach_list_safe(node
, instructions
) {
5606 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5607 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
5608 var
->data
.mode
== mode
) {
5609 state
->symbols
->disable_variable(var
->name
);