2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
57 #include "program/hash_table.h"
61 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
62 exec_list
*instructions
);
65 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
67 _mesa_glsl_initialize_variables(instructions
, state
);
69 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
71 state
->current_function
= NULL
;
73 state
->toplevel_ir
= instructions
;
75 /* Section 4.2 of the GLSL 1.20 specification states:
76 * "The built-in functions are scoped in a scope outside the global scope
77 * users declare global variables in. That is, a shader's global scope,
78 * available for user-defined functions and global variables, is nested
79 * inside the scope containing the built-in functions."
81 * Since built-in functions like ftransform() access built-in variables,
82 * it follows that those must be in the outer scope as well.
84 * We push scope here to create this nesting effect...but don't pop.
85 * This way, a shader's globals are still in the symbol table for use
88 state
->symbols
->push_scope();
90 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
91 ast
->hir(instructions
, state
);
93 detect_recursion_unlinked(state
, instructions
);
94 detect_conflicting_assignments(state
, instructions
);
96 state
->toplevel_ir
= NULL
;
101 * If a conversion is available, convert one operand to a different type
103 * The \c from \c ir_rvalue is converted "in place".
105 * \param to Type that the operand it to be converted to
106 * \param from Operand that is being converted
107 * \param state GLSL compiler state
110 * If a conversion is possible (or unnecessary), \c true is returned.
111 * Otherwise \c false is returned.
114 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
115 struct _mesa_glsl_parse_state
*state
)
118 if (to
->base_type
== from
->type
->base_type
)
121 /* This conversion was added in GLSL 1.20. If the compilation mode is
122 * GLSL 1.10, the conversion is skipped.
124 if (!state
->is_version(120, 0))
127 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
129 * "There are no implicit array or structure conversions. For
130 * example, an array of int cannot be implicitly converted to an
131 * array of float. There are no implicit conversions between
132 * signed and unsigned integers."
134 /* FINISHME: The above comment is partially a lie. There is int/uint
135 * FINISHME: conversion for immediate constants.
137 if (!to
->is_float() || !from
->type
->is_numeric())
140 /* Convert to a floating point type with the same number of components
141 * as the original type - i.e. int to float, not int to vec4.
143 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
144 from
->type
->matrix_columns
);
146 switch (from
->type
->base_type
) {
148 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
151 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
154 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
164 static const struct glsl_type
*
165 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
167 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
169 const glsl_type
*type_a
= value_a
->type
;
170 const glsl_type
*type_b
= value_b
->type
;
172 /* From GLSL 1.50 spec, page 56:
174 * "The arithmetic binary operators add (+), subtract (-),
175 * multiply (*), and divide (/) operate on integer and
176 * floating-point scalars, vectors, and matrices."
178 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
179 _mesa_glsl_error(loc
, state
,
180 "Operands to arithmetic operators must be numeric");
181 return glsl_type::error_type
;
185 /* "If one operand is floating-point based and the other is
186 * not, then the conversions from Section 4.1.10 "Implicit
187 * Conversions" are applied to the non-floating-point-based operand."
189 if (!apply_implicit_conversion(type_a
, value_b
, state
)
190 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
191 _mesa_glsl_error(loc
, state
,
192 "Could not implicitly convert operands to "
193 "arithmetic operator");
194 return glsl_type::error_type
;
196 type_a
= value_a
->type
;
197 type_b
= value_b
->type
;
199 /* "If the operands are integer types, they must both be signed or
202 * From this rule and the preceeding conversion it can be inferred that
203 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
204 * The is_numeric check above already filtered out the case where either
205 * type is not one of these, so now the base types need only be tested for
208 if (type_a
->base_type
!= type_b
->base_type
) {
209 _mesa_glsl_error(loc
, state
,
210 "base type mismatch for arithmetic operator");
211 return glsl_type::error_type
;
214 /* "All arithmetic binary operators result in the same fundamental type
215 * (signed integer, unsigned integer, or floating-point) as the
216 * operands they operate on, after operand type conversion. After
217 * conversion, the following cases are valid
219 * * The two operands are scalars. In this case the operation is
220 * applied, resulting in a scalar."
222 if (type_a
->is_scalar() && type_b
->is_scalar())
225 /* "* One operand is a scalar, and the other is a vector or matrix.
226 * In this case, the scalar operation is applied independently to each
227 * component of the vector or matrix, resulting in the same size
230 if (type_a
->is_scalar()) {
231 if (!type_b
->is_scalar())
233 } else if (type_b
->is_scalar()) {
237 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
238 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
241 assert(!type_a
->is_scalar());
242 assert(!type_b
->is_scalar());
244 /* "* The two operands are vectors of the same size. In this case, the
245 * operation is done component-wise resulting in the same size
248 if (type_a
->is_vector() && type_b
->is_vector()) {
249 if (type_a
== type_b
) {
252 _mesa_glsl_error(loc
, state
,
253 "vector size mismatch for arithmetic operator");
254 return glsl_type::error_type
;
258 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
259 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
260 * <vector, vector> have been handled. At least one of the operands must
261 * be matrix. Further, since there are no integer matrix types, the base
262 * type of both operands must be float.
264 assert(type_a
->is_matrix() || type_b
->is_matrix());
265 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
266 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
268 /* "* The operator is add (+), subtract (-), or divide (/), and the
269 * operands are matrices with the same number of rows and the same
270 * number of columns. In this case, the operation is done component-
271 * wise resulting in the same size matrix."
272 * * The operator is multiply (*), where both operands are matrices or
273 * one operand is a vector and the other a matrix. A right vector
274 * operand is treated as a column vector and a left vector operand as a
275 * row vector. In all these cases, it is required that the number of
276 * columns of the left operand is equal to the number of rows of the
277 * right operand. Then, the multiply (*) operation does a linear
278 * algebraic multiply, yielding an object that has the same number of
279 * rows as the left operand and the same number of columns as the right
280 * operand. Section 5.10 "Vector and Matrix Operations" explains in
281 * more detail how vectors and matrices are operated on."
284 if (type_a
== type_b
)
287 if (type_a
->is_matrix() && type_b
->is_matrix()) {
288 /* Matrix multiply. The columns of A must match the rows of B. Given
289 * the other previously tested constraints, this means the vector type
290 * of a row from A must be the same as the vector type of a column from
293 if (type_a
->row_type() == type_b
->column_type()) {
294 /* The resulting matrix has the number of columns of matrix B and
295 * the number of rows of matrix A. We get the row count of A by
296 * looking at the size of a vector that makes up a column. The
297 * transpose (size of a row) is done for B.
299 const glsl_type
*const type
=
300 glsl_type::get_instance(type_a
->base_type
,
301 type_a
->column_type()->vector_elements
,
302 type_b
->row_type()->vector_elements
);
303 assert(type
!= glsl_type::error_type
);
307 } else if (type_a
->is_matrix()) {
308 /* A is a matrix and B is a column vector. Columns of A must match
309 * rows of B. Given the other previously tested constraints, this
310 * means the vector type of a row from A must be the same as the
311 * vector the type of B.
313 if (type_a
->row_type() == type_b
) {
314 /* The resulting vector has a number of elements equal to
315 * the number of rows of matrix A. */
316 const glsl_type
*const type
=
317 glsl_type::get_instance(type_a
->base_type
,
318 type_a
->column_type()->vector_elements
,
320 assert(type
!= glsl_type::error_type
);
325 assert(type_b
->is_matrix());
327 /* A is a row vector and B is a matrix. Columns of A must match rows
328 * of B. Given the other previously tested constraints, this means
329 * the type of A must be the same as the vector type of a column from
332 if (type_a
== type_b
->column_type()) {
333 /* The resulting vector has a number of elements equal to
334 * the number of columns of matrix B. */
335 const glsl_type
*const type
=
336 glsl_type::get_instance(type_a
->base_type
,
337 type_b
->row_type()->vector_elements
,
339 assert(type
!= glsl_type::error_type
);
345 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
346 return glsl_type::error_type
;
350 /* "All other cases are illegal."
352 _mesa_glsl_error(loc
, state
, "type mismatch");
353 return glsl_type::error_type
;
357 static const struct glsl_type
*
358 unary_arithmetic_result_type(const struct glsl_type
*type
,
359 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
361 /* From GLSL 1.50 spec, page 57:
363 * "The arithmetic unary operators negate (-), post- and pre-increment
364 * and decrement (-- and ++) operate on integer or floating-point
365 * values (including vectors and matrices). All unary operators work
366 * component-wise on their operands. These result with the same type
369 if (!type
->is_numeric()) {
370 _mesa_glsl_error(loc
, state
,
371 "Operands to arithmetic operators must be numeric");
372 return glsl_type::error_type
;
379 * \brief Return the result type of a bit-logic operation.
381 * If the given types to the bit-logic operator are invalid, return
382 * glsl_type::error_type.
384 * \param type_a Type of LHS of bit-logic op
385 * \param type_b Type of RHS of bit-logic op
387 static const struct glsl_type
*
388 bit_logic_result_type(const struct glsl_type
*type_a
,
389 const struct glsl_type
*type_b
,
391 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
393 if (!state
->check_bitwise_operations_allowed(loc
)) {
394 return glsl_type::error_type
;
397 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
399 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
400 * (|). The operands must be of type signed or unsigned integers or
403 if (!type_a
->is_integer()) {
404 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
405 ast_expression::operator_string(op
));
406 return glsl_type::error_type
;
408 if (!type_b
->is_integer()) {
409 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
410 ast_expression::operator_string(op
));
411 return glsl_type::error_type
;
414 /* "The fundamental types of the operands (signed or unsigned) must
417 if (type_a
->base_type
!= type_b
->base_type
) {
418 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
419 "base type", ast_expression::operator_string(op
));
420 return glsl_type::error_type
;
423 /* "The operands cannot be vectors of differing size." */
424 if (type_a
->is_vector() &&
425 type_b
->is_vector() &&
426 type_a
->vector_elements
!= type_b
->vector_elements
) {
427 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
428 "different sizes", ast_expression::operator_string(op
));
429 return glsl_type::error_type
;
432 /* "If one operand is a scalar and the other a vector, the scalar is
433 * applied component-wise to the vector, resulting in the same type as
434 * the vector. The fundamental types of the operands [...] will be the
435 * resulting fundamental type."
437 if (type_a
->is_scalar())
443 static const struct glsl_type
*
444 modulus_result_type(const struct glsl_type
*type_a
,
445 const struct glsl_type
*type_b
,
446 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
448 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
449 return glsl_type::error_type
;
452 /* From GLSL 1.50 spec, page 56:
453 * "The operator modulus (%) operates on signed or unsigned integers or
454 * integer vectors. The operand types must both be signed or both be
457 if (!type_a
->is_integer()) {
458 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
459 return glsl_type::error_type
;
461 if (!type_b
->is_integer()) {
462 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
463 return glsl_type::error_type
;
465 if (type_a
->base_type
!= type_b
->base_type
) {
466 _mesa_glsl_error(loc
, state
,
467 "operands of %% must have the same base type");
468 return glsl_type::error_type
;
471 /* "The operands cannot be vectors of differing size. If one operand is
472 * a scalar and the other vector, then the scalar is applied component-
473 * wise to the vector, resulting in the same type as the vector. If both
474 * are vectors of the same size, the result is computed component-wise."
476 if (type_a
->is_vector()) {
477 if (!type_b
->is_vector()
478 || (type_a
->vector_elements
== type_b
->vector_elements
))
483 /* "The operator modulus (%) is not defined for any other data types
484 * (non-integer types)."
486 _mesa_glsl_error(loc
, state
, "type mismatch");
487 return glsl_type::error_type
;
491 static const struct glsl_type
*
492 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
493 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
495 const glsl_type
*type_a
= value_a
->type
;
496 const glsl_type
*type_b
= value_b
->type
;
498 /* From GLSL 1.50 spec, page 56:
499 * "The relational operators greater than (>), less than (<), greater
500 * than or equal (>=), and less than or equal (<=) operate only on
501 * scalar integer and scalar floating-point expressions."
503 if (!type_a
->is_numeric()
504 || !type_b
->is_numeric()
505 || !type_a
->is_scalar()
506 || !type_b
->is_scalar()) {
507 _mesa_glsl_error(loc
, state
,
508 "Operands to relational operators must be scalar and "
510 return glsl_type::error_type
;
513 /* "Either the operands' types must match, or the conversions from
514 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
515 * operand, after which the types must match."
517 if (!apply_implicit_conversion(type_a
, value_b
, state
)
518 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
519 _mesa_glsl_error(loc
, state
,
520 "Could not implicitly convert operands to "
521 "relational operator");
522 return glsl_type::error_type
;
524 type_a
= value_a
->type
;
525 type_b
= value_b
->type
;
527 if (type_a
->base_type
!= type_b
->base_type
) {
528 _mesa_glsl_error(loc
, state
, "base type mismatch");
529 return glsl_type::error_type
;
532 /* "The result is scalar Boolean."
534 return glsl_type::bool_type
;
538 * \brief Return the result type of a bit-shift operation.
540 * If the given types to the bit-shift operator are invalid, return
541 * glsl_type::error_type.
543 * \param type_a Type of LHS of bit-shift op
544 * \param type_b Type of RHS of bit-shift op
546 static const struct glsl_type
*
547 shift_result_type(const struct glsl_type
*type_a
,
548 const struct glsl_type
*type_b
,
550 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
552 if (!state
->check_bitwise_operations_allowed(loc
)) {
553 return glsl_type::error_type
;
556 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
558 * "The shift operators (<<) and (>>). For both operators, the operands
559 * must be signed or unsigned integers or integer vectors. One operand
560 * can be signed while the other is unsigned."
562 if (!type_a
->is_integer()) {
563 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
564 "integer vector", ast_expression::operator_string(op
));
565 return glsl_type::error_type
;
568 if (!type_b
->is_integer()) {
569 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
570 "integer vector", ast_expression::operator_string(op
));
571 return glsl_type::error_type
;
574 /* "If the first operand is a scalar, the second operand has to be
577 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
578 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
579 "second must be scalar as well",
580 ast_expression::operator_string(op
));
581 return glsl_type::error_type
;
584 /* If both operands are vectors, check that they have same number of
587 if (type_a
->is_vector() &&
588 type_b
->is_vector() &&
589 type_a
->vector_elements
!= type_b
->vector_elements
) {
590 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
591 "have same number of elements",
592 ast_expression::operator_string(op
));
593 return glsl_type::error_type
;
596 /* "In all cases, the resulting type will be the same type as the left
603 * Validates that a value can be assigned to a location with a specified type
605 * Validates that \c rhs can be assigned to some location. If the types are
606 * not an exact match but an automatic conversion is possible, \c rhs will be
610 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
611 * Otherwise the actual RHS to be assigned will be returned. This may be
612 * \c rhs, or it may be \c rhs after some type conversion.
615 * In addition to being used for assignments, this function is used to
616 * type-check return values.
619 validate_assignment(struct _mesa_glsl_parse_state
*state
,
620 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
623 /* If there is already some error in the RHS, just return it. Anything
624 * else will lead to an avalanche of error message back to the user.
626 if (rhs
->type
->is_error())
629 /* If the types are identical, the assignment can trivially proceed.
631 if (rhs
->type
== lhs_type
)
634 /* If the array element types are the same and the size of the LHS is zero,
635 * the assignment is okay for initializers embedded in variable
638 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
639 * is handled by ir_dereference::is_lvalue.
641 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
642 && (lhs_type
->element_type() == rhs
->type
->element_type())
643 && (lhs_type
->array_size() == 0)) {
647 /* Check for implicit conversion in GLSL 1.20 */
648 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
649 if (rhs
->type
== lhs_type
)
657 mark_whole_array_access(ir_rvalue
*access
)
659 ir_dereference_variable
*deref
= access
->as_dereference_variable();
661 if (deref
&& deref
->var
) {
662 deref
->var
->max_array_access
= deref
->type
->length
- 1;
667 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
668 const char *non_lvalue_description
,
669 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
673 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
675 ir_variable
*lhs_var
= lhs
->variable_referenced();
677 lhs_var
->assigned
= true;
679 if (!error_emitted
) {
680 if (non_lvalue_description
!= NULL
) {
681 _mesa_glsl_error(&lhs_loc
, state
,
683 non_lvalue_description
);
684 error_emitted
= true;
685 } else if (lhs
->variable_referenced() != NULL
686 && lhs
->variable_referenced()->read_only
) {
687 _mesa_glsl_error(&lhs_loc
, state
,
688 "assignment to read-only variable '%s'",
689 lhs
->variable_referenced()->name
);
690 error_emitted
= true;
692 } else if (lhs
->type
->is_array() &&
693 !state
->check_version(120, 300, &lhs_loc
,
694 "whole array assignment forbidden")) {
695 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
697 * "Other binary or unary expressions, non-dereferenced
698 * arrays, function names, swizzles with repeated fields,
699 * and constants cannot be l-values."
701 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
703 error_emitted
= true;
704 } else if (!lhs
->is_lvalue()) {
705 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
706 error_emitted
= true;
711 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
712 if (new_rhs
== NULL
) {
713 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
717 /* If the LHS array was not declared with a size, it takes it size from
718 * the RHS. If the LHS is an l-value and a whole array, it must be a
719 * dereference of a variable. Any other case would require that the LHS
720 * is either not an l-value or not a whole array.
722 if (lhs
->type
->array_size() == 0) {
723 ir_dereference
*const d
= lhs
->as_dereference();
727 ir_variable
*const var
= d
->variable_referenced();
731 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
732 /* FINISHME: This should actually log the location of the RHS. */
733 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
735 var
->max_array_access
);
738 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
739 rhs
->type
->array_size());
742 mark_whole_array_access(rhs
);
743 mark_whole_array_access(lhs
);
746 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
747 * but not post_inc) need the converted assigned value as an rvalue
748 * to handle things like:
752 * So we always just store the computed value being assigned to a
753 * temporary and return a deref of that temporary. If the rvalue
754 * ends up not being used, the temp will get copy-propagated out.
756 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
758 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
759 instructions
->push_tail(var
);
760 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
761 deref_var
= new(ctx
) ir_dereference_variable(var
);
764 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
766 return new(ctx
) ir_dereference_variable(var
);
770 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
772 void *ctx
= ralloc_parent(lvalue
);
775 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
777 instructions
->push_tail(var
);
778 var
->mode
= ir_var_auto
;
780 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
783 return new(ctx
) ir_dereference_variable(var
);
788 ast_node::hir(exec_list
*instructions
,
789 struct _mesa_glsl_parse_state
*state
)
798 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
801 ir_rvalue
*cmp
= NULL
;
803 if (operation
== ir_binop_all_equal
)
804 join_op
= ir_binop_logic_and
;
806 join_op
= ir_binop_logic_or
;
808 switch (op0
->type
->base_type
) {
809 case GLSL_TYPE_FLOAT
:
813 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
815 case GLSL_TYPE_ARRAY
: {
816 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
817 ir_rvalue
*e0
, *e1
, *result
;
819 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
820 new(mem_ctx
) ir_constant(i
));
821 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
822 new(mem_ctx
) ir_constant(i
));
823 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
826 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
832 mark_whole_array_access(op0
);
833 mark_whole_array_access(op1
);
837 case GLSL_TYPE_STRUCT
: {
838 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
839 ir_rvalue
*e0
, *e1
, *result
;
840 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
842 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
844 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
846 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
849 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
857 case GLSL_TYPE_ERROR
:
859 case GLSL_TYPE_SAMPLER
:
860 case GLSL_TYPE_INTERFACE
:
861 /* I assume a comparison of a struct containing a sampler just
862 * ignores the sampler present in the type.
868 cmp
= new(mem_ctx
) ir_constant(true);
873 /* For logical operations, we want to ensure that the operands are
874 * scalar booleans. If it isn't, emit an error and return a constant
875 * boolean to avoid triggering cascading error messages.
878 get_scalar_boolean_operand(exec_list
*instructions
,
879 struct _mesa_glsl_parse_state
*state
,
880 ast_expression
*parent_expr
,
882 const char *operand_name
,
885 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
887 ir_rvalue
*val
= expr
->hir(instructions
, state
);
889 if (val
->type
->is_boolean() && val
->type
->is_scalar())
892 if (!*error_emitted
) {
893 YYLTYPE loc
= expr
->get_location();
894 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
896 parent_expr
->operator_string(parent_expr
->oper
));
897 *error_emitted
= true;
900 return new(ctx
) ir_constant(true);
904 * If name refers to a builtin array whose maximum allowed size is less than
905 * size, report an error and return true. Otherwise return false.
908 check_builtin_array_max_size(const char *name
, unsigned size
,
909 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
911 if ((strcmp("gl_TexCoord", name
) == 0)
912 && (size
> state
->Const
.MaxTextureCoords
)) {
913 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
915 * "The size [of gl_TexCoord] can be at most
916 * gl_MaxTextureCoords."
918 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
919 "be larger than gl_MaxTextureCoords (%u)\n",
920 state
->Const
.MaxTextureCoords
);
922 } else if (strcmp("gl_ClipDistance", name
) == 0
923 && size
> state
->Const
.MaxClipPlanes
) {
924 /* From section 7.1 (Vertex Shader Special Variables) of the
927 * "The gl_ClipDistance array is predeclared as unsized and
928 * must be sized by the shader either redeclaring it with a
929 * size or indexing it only with integral constant
930 * expressions. ... The size can be at most
931 * gl_MaxClipDistances."
933 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
934 "be larger than gl_MaxClipDistances (%u)\n",
935 state
->Const
.MaxClipPlanes
);
942 * Create the constant 1, of a which is appropriate for incrementing and
943 * decrementing values of the given GLSL type. For example, if type is vec4,
944 * this creates a constant value of 1.0 having type float.
946 * If the given type is invalid for increment and decrement operators, return
947 * a floating point 1--the error will be detected later.
950 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
952 switch (type
->base_type
) {
954 return new(ctx
) ir_constant((unsigned) 1);
956 return new(ctx
) ir_constant(1);
958 case GLSL_TYPE_FLOAT
:
959 return new(ctx
) ir_constant(1.0f
);
964 ast_expression::hir(exec_list
*instructions
,
965 struct _mesa_glsl_parse_state
*state
)
968 static const int operations
[AST_NUM_OPERATORS
] = {
969 -1, /* ast_assign doesn't convert to ir_expression. */
970 -1, /* ast_plus doesn't convert to ir_expression. */
994 /* Note: The following block of expression types actually convert
995 * to multiple IR instructions.
997 ir_binop_mul
, /* ast_mul_assign */
998 ir_binop_div
, /* ast_div_assign */
999 ir_binop_mod
, /* ast_mod_assign */
1000 ir_binop_add
, /* ast_add_assign */
1001 ir_binop_sub
, /* ast_sub_assign */
1002 ir_binop_lshift
, /* ast_ls_assign */
1003 ir_binop_rshift
, /* ast_rs_assign */
1004 ir_binop_bit_and
, /* ast_and_assign */
1005 ir_binop_bit_xor
, /* ast_xor_assign */
1006 ir_binop_bit_or
, /* ast_or_assign */
1008 -1, /* ast_conditional doesn't convert to ir_expression. */
1009 ir_binop_add
, /* ast_pre_inc. */
1010 ir_binop_sub
, /* ast_pre_dec. */
1011 ir_binop_add
, /* ast_post_inc. */
1012 ir_binop_sub
, /* ast_post_dec. */
1013 -1, /* ast_field_selection doesn't conv to ir_expression. */
1014 -1, /* ast_array_index doesn't convert to ir_expression. */
1015 -1, /* ast_function_call doesn't conv to ir_expression. */
1016 -1, /* ast_identifier doesn't convert to ir_expression. */
1017 -1, /* ast_int_constant doesn't convert to ir_expression. */
1018 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1019 -1, /* ast_float_constant doesn't conv to ir_expression. */
1020 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1021 -1, /* ast_sequence doesn't convert to ir_expression. */
1023 ir_rvalue
*result
= NULL
;
1025 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1026 bool error_emitted
= false;
1029 loc
= this->get_location();
1031 switch (this->oper
) {
1033 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1034 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1036 result
= do_assignment(instructions
, state
,
1037 this->subexpressions
[0]->non_lvalue_description
,
1038 op
[0], op
[1], false,
1039 this->subexpressions
[0]->get_location());
1040 error_emitted
= result
->type
->is_error();
1045 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1047 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1049 error_emitted
= type
->is_error();
1055 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1057 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1059 error_emitted
= type
->is_error();
1061 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1069 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1070 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1072 type
= arithmetic_result_type(op
[0], op
[1],
1073 (this->oper
== ast_mul
),
1075 error_emitted
= type
->is_error();
1077 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1082 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1083 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1085 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1087 assert(operations
[this->oper
] == ir_binop_mod
);
1089 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1091 error_emitted
= type
->is_error();
1096 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1097 error_emitted
= true;
1100 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1101 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1102 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1104 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1106 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1113 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1114 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1116 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1118 /* The relational operators must either generate an error or result
1119 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1121 assert(type
->is_error()
1122 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1123 && type
->is_scalar()));
1125 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1127 error_emitted
= type
->is_error();
1132 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1133 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1135 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1137 * "The equality operators equal (==), and not equal (!=)
1138 * operate on all types. They result in a scalar Boolean. If
1139 * the operand types do not match, then there must be a
1140 * conversion from Section 4.1.10 "Implicit Conversions"
1141 * applied to one operand that can make them match, in which
1142 * case this conversion is done."
1144 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1145 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1146 || (op
[0]->type
!= op
[1]->type
)) {
1147 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1148 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1149 error_emitted
= true;
1150 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1151 !state
->check_version(120, 300, &loc
,
1152 "array comparisons forbidden")) {
1153 error_emitted
= true;
1156 if (error_emitted
) {
1157 result
= new(ctx
) ir_constant(false);
1159 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1160 assert(result
->type
== glsl_type::bool_type
);
1167 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1168 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1169 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1171 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1173 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1177 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1179 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1180 error_emitted
= true;
1183 if (!op
[0]->type
->is_integer()) {
1184 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1185 error_emitted
= true;
1188 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1189 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1192 case ast_logic_and
: {
1193 exec_list rhs_instructions
;
1194 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1195 "LHS", &error_emitted
);
1196 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1197 "RHS", &error_emitted
);
1199 if (rhs_instructions
.is_empty()) {
1200 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1201 type
= result
->type
;
1203 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1206 instructions
->push_tail(tmp
);
1208 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1209 instructions
->push_tail(stmt
);
1211 stmt
->then_instructions
.append_list(&rhs_instructions
);
1212 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1213 ir_assignment
*const then_assign
=
1214 new(ctx
) ir_assignment(then_deref
, op
[1]);
1215 stmt
->then_instructions
.push_tail(then_assign
);
1217 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1218 ir_assignment
*const else_assign
=
1219 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1220 stmt
->else_instructions
.push_tail(else_assign
);
1222 result
= new(ctx
) ir_dereference_variable(tmp
);
1228 case ast_logic_or
: {
1229 exec_list rhs_instructions
;
1230 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1231 "LHS", &error_emitted
);
1232 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1233 "RHS", &error_emitted
);
1235 if (rhs_instructions
.is_empty()) {
1236 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1237 type
= result
->type
;
1239 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1242 instructions
->push_tail(tmp
);
1244 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1245 instructions
->push_tail(stmt
);
1247 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1248 ir_assignment
*const then_assign
=
1249 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1250 stmt
->then_instructions
.push_tail(then_assign
);
1252 stmt
->else_instructions
.append_list(&rhs_instructions
);
1253 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1254 ir_assignment
*const else_assign
=
1255 new(ctx
) ir_assignment(else_deref
, op
[1]);
1256 stmt
->else_instructions
.push_tail(else_assign
);
1258 result
= new(ctx
) ir_dereference_variable(tmp
);
1265 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1267 * "The logical binary operators and (&&), or ( | | ), and
1268 * exclusive or (^^). They operate only on two Boolean
1269 * expressions and result in a Boolean expression."
1271 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1273 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1276 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1281 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1282 "operand", &error_emitted
);
1284 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1288 case ast_mul_assign
:
1289 case ast_div_assign
:
1290 case ast_add_assign
:
1291 case ast_sub_assign
: {
1292 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1293 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1295 type
= arithmetic_result_type(op
[0], op
[1],
1296 (this->oper
== ast_mul_assign
),
1299 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1302 result
= do_assignment(instructions
, state
,
1303 this->subexpressions
[0]->non_lvalue_description
,
1304 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1305 this->subexpressions
[0]->get_location());
1306 error_emitted
= (op
[0]->type
->is_error());
1308 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1309 * explicitly test for this because none of the binary expression
1310 * operators allow array operands either.
1316 case ast_mod_assign
: {
1317 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1318 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1320 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1322 assert(operations
[this->oper
] == ir_binop_mod
);
1324 ir_rvalue
*temp_rhs
;
1325 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1328 result
= do_assignment(instructions
, state
,
1329 this->subexpressions
[0]->non_lvalue_description
,
1330 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1331 this->subexpressions
[0]->get_location());
1332 error_emitted
= type
->is_error();
1337 case ast_rs_assign
: {
1338 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1339 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1340 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1342 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1343 type
, op
[0], op
[1]);
1344 result
= do_assignment(instructions
, state
,
1345 this->subexpressions
[0]->non_lvalue_description
,
1346 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1347 this->subexpressions
[0]->get_location());
1348 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1352 case ast_and_assign
:
1353 case ast_xor_assign
:
1354 case ast_or_assign
: {
1355 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1356 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1357 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1359 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1360 type
, op
[0], op
[1]);
1361 result
= do_assignment(instructions
, state
,
1362 this->subexpressions
[0]->non_lvalue_description
,
1363 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1364 this->subexpressions
[0]->get_location());
1365 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1369 case ast_conditional
: {
1370 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1372 * "The ternary selection operator (?:). It operates on three
1373 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1374 * first expression, which must result in a scalar Boolean."
1376 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1377 "condition", &error_emitted
);
1379 /* The :? operator is implemented by generating an anonymous temporary
1380 * followed by an if-statement. The last instruction in each branch of
1381 * the if-statement assigns a value to the anonymous temporary. This
1382 * temporary is the r-value of the expression.
1384 exec_list then_instructions
;
1385 exec_list else_instructions
;
1387 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1388 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1390 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1392 * "The second and third expressions can be any type, as
1393 * long their types match, or there is a conversion in
1394 * Section 4.1.10 "Implicit Conversions" that can be applied
1395 * to one of the expressions to make their types match. This
1396 * resulting matching type is the type of the entire
1399 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1400 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1401 || (op
[1]->type
!= op
[2]->type
)) {
1402 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1404 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1405 "operator must have matching types.");
1406 error_emitted
= true;
1407 type
= glsl_type::error_type
;
1412 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1414 * "The second and third expressions must be the same type, but can
1415 * be of any type other than an array."
1417 if (type
->is_array() &&
1418 !state
->check_version(120, 300, &loc
,
1419 "Second and third operands of ?: operator "
1420 "cannot be arrays")) {
1421 error_emitted
= true;
1424 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1425 ir_constant
*then_val
= op
[1]->constant_expression_value();
1426 ir_constant
*else_val
= op
[2]->constant_expression_value();
1428 if (then_instructions
.is_empty()
1429 && else_instructions
.is_empty()
1430 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1431 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1433 ir_variable
*const tmp
=
1434 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1435 instructions
->push_tail(tmp
);
1437 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1438 instructions
->push_tail(stmt
);
1440 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1441 ir_dereference
*const then_deref
=
1442 new(ctx
) ir_dereference_variable(tmp
);
1443 ir_assignment
*const then_assign
=
1444 new(ctx
) ir_assignment(then_deref
, op
[1]);
1445 stmt
->then_instructions
.push_tail(then_assign
);
1447 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1448 ir_dereference
*const else_deref
=
1449 new(ctx
) ir_dereference_variable(tmp
);
1450 ir_assignment
*const else_assign
=
1451 new(ctx
) ir_assignment(else_deref
, op
[2]);
1452 stmt
->else_instructions
.push_tail(else_assign
);
1454 result
= new(ctx
) ir_dereference_variable(tmp
);
1461 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1462 ? "pre-increment operation" : "pre-decrement operation";
1464 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1465 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1467 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1469 ir_rvalue
*temp_rhs
;
1470 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1473 result
= do_assignment(instructions
, state
,
1474 this->subexpressions
[0]->non_lvalue_description
,
1475 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1476 this->subexpressions
[0]->get_location());
1477 error_emitted
= op
[0]->type
->is_error();
1482 case ast_post_dec
: {
1483 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1484 ? "post-increment operation" : "post-decrement operation";
1485 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1486 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1488 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1490 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1492 ir_rvalue
*temp_rhs
;
1493 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1496 /* Get a temporary of a copy of the lvalue before it's modified.
1497 * This may get thrown away later.
1499 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1501 (void)do_assignment(instructions
, state
,
1502 this->subexpressions
[0]->non_lvalue_description
,
1503 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1504 this->subexpressions
[0]->get_location());
1506 error_emitted
= op
[0]->type
->is_error();
1510 case ast_field_selection
:
1511 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1514 case ast_array_index
: {
1515 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1517 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1518 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1520 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1522 ir_rvalue
*const array
= op
[0];
1524 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1526 /* Do not use op[0] after this point. Use array.
1534 if (!array
->type
->is_array()
1535 && !array
->type
->is_matrix()
1536 && !array
->type
->is_vector()) {
1537 _mesa_glsl_error(& index_loc
, state
,
1538 "cannot dereference non-array / non-matrix / "
1540 error_emitted
= true;
1543 if (!op
[1]->type
->is_integer()) {
1544 _mesa_glsl_error(& index_loc
, state
,
1545 "array index must be integer type");
1546 error_emitted
= true;
1547 } else if (!op
[1]->type
->is_scalar()) {
1548 _mesa_glsl_error(& index_loc
, state
,
1549 "array index must be scalar");
1550 error_emitted
= true;
1553 /* If the array index is a constant expression and the array has a
1554 * declared size, ensure that the access is in-bounds. If the array
1555 * index is not a constant expression, ensure that the array has a
1558 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1559 if (const_index
!= NULL
) {
1560 const int idx
= const_index
->value
.i
[0];
1561 const char *type_name
;
1564 if (array
->type
->is_matrix()) {
1565 type_name
= "matrix";
1566 } else if (array
->type
->is_vector()) {
1567 type_name
= "vector";
1569 type_name
= "array";
1572 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1574 * "It is illegal to declare an array with a size, and then
1575 * later (in the same shader) index the same array with an
1576 * integral constant expression greater than or equal to the
1577 * declared size. It is also illegal to index an array with a
1578 * negative constant expression."
1580 if (array
->type
->is_matrix()) {
1581 if (array
->type
->row_type()->vector_elements
<= idx
) {
1582 bound
= array
->type
->row_type()->vector_elements
;
1584 } else if (array
->type
->is_vector()) {
1585 if (array
->type
->vector_elements
<= idx
) {
1586 bound
= array
->type
->vector_elements
;
1589 if ((array
->type
->array_size() > 0)
1590 && (array
->type
->array_size() <= idx
)) {
1591 bound
= array
->type
->array_size();
1596 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1598 error_emitted
= true;
1599 } else if (idx
< 0) {
1600 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1602 error_emitted
= true;
1605 if (array
->type
->is_array()) {
1606 /* If the array is a variable dereference, it dereferences the
1607 * whole array, by definition. Use this to get the variable.
1609 * FINISHME: Should some methods for getting / setting / testing
1610 * FINISHME: array access limits be added to ir_dereference?
1612 ir_variable
*const v
= array
->whole_variable_referenced();
1613 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
)) {
1614 v
->max_array_access
= idx
;
1616 /* Check whether this access will, as a side effect, implicitly
1617 * cause the size of a built-in array to be too large.
1619 if (check_builtin_array_max_size(v
->name
, idx
+1, loc
, state
))
1620 error_emitted
= true;
1623 } else if (array
->type
->array_size() == 0) {
1624 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1626 if (array
->type
->is_array()) {
1627 /* whole_variable_referenced can return NULL if the array is a
1628 * member of a structure. In this case it is safe to not update
1629 * the max_array_access field because it is never used for fields
1632 ir_variable
*v
= array
->whole_variable_referenced();
1634 v
->max_array_access
= array
->type
->array_size() - 1;
1638 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1640 * "Samplers aggregated into arrays within a shader (using square
1641 * brackets [ ]) can only be indexed with integral constant
1642 * expressions [...]."
1644 * This restriction was added in GLSL 1.30. Shaders using earlier version
1645 * of the language should not be rejected by the compiler front-end for
1646 * using this construct. This allows useful things such as using a loop
1647 * counter as the index to an array of samplers. If the loop in unrolled,
1648 * the code should compile correctly. Instead, emit a warning.
1650 if (array
->type
->is_array() &&
1651 array
->type
->element_type()->is_sampler() &&
1652 const_index
== NULL
) {
1654 if (!state
->is_version(130, 100)) {
1655 if (state
->es_shader
) {
1656 _mesa_glsl_warning(&loc
, state
,
1657 "sampler arrays indexed with non-constant "
1658 "expressions is optional in %s",
1659 state
->get_version_string());
1661 _mesa_glsl_warning(&loc
, state
,
1662 "sampler arrays indexed with non-constant "
1663 "expressions will be forbidden in GLSL 1.30 and "
1667 _mesa_glsl_error(&loc
, state
,
1668 "sampler arrays indexed with non-constant "
1669 "expressions is forbidden in GLSL 1.30 and "
1671 error_emitted
= true;
1676 result
->type
= glsl_type::error_type
;
1681 case ast_function_call
:
1682 /* Should *NEVER* get here. ast_function_call should always be handled
1683 * by ast_function_expression::hir.
1688 case ast_identifier
: {
1689 /* ast_identifier can appear several places in a full abstract syntax
1690 * tree. This particular use must be at location specified in the grammar
1691 * as 'variable_identifier'.
1694 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1698 result
= new(ctx
) ir_dereference_variable(var
);
1700 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1701 this->primary_expression
.identifier
);
1703 result
= ir_rvalue::error_value(ctx
);
1704 error_emitted
= true;
1709 case ast_int_constant
:
1710 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1713 case ast_uint_constant
:
1714 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1717 case ast_float_constant
:
1718 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1721 case ast_bool_constant
:
1722 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1725 case ast_sequence
: {
1726 /* It should not be possible to generate a sequence in the AST without
1727 * any expressions in it.
1729 assert(!this->expressions
.is_empty());
1731 /* The r-value of a sequence is the last expression in the sequence. If
1732 * the other expressions in the sequence do not have side-effects (and
1733 * therefore add instructions to the instruction list), they get dropped
1736 exec_node
*previous_tail_pred
= NULL
;
1737 YYLTYPE previous_operand_loc
= loc
;
1739 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1740 /* If one of the operands of comma operator does not generate any
1741 * code, we want to emit a warning. At each pass through the loop
1742 * previous_tail_pred will point to the last instruction in the
1743 * stream *before* processing the previous operand. Naturally,
1744 * instructions->tail_pred will point to the last instruction in the
1745 * stream *after* processing the previous operand. If the two
1746 * pointers match, then the previous operand had no effect.
1748 * The warning behavior here differs slightly from GCC. GCC will
1749 * only emit a warning if none of the left-hand operands have an
1750 * effect. However, it will emit a warning for each. I believe that
1751 * there are some cases in C (especially with GCC extensions) where
1752 * it is useful to have an intermediate step in a sequence have no
1753 * effect, but I don't think these cases exist in GLSL. Either way,
1754 * it would be a giant hassle to replicate that behavior.
1756 if (previous_tail_pred
== instructions
->tail_pred
) {
1757 _mesa_glsl_warning(&previous_operand_loc
, state
,
1758 "left-hand operand of comma expression has "
1762 /* tail_pred is directly accessed instead of using the get_tail()
1763 * method for performance reasons. get_tail() has extra code to
1764 * return NULL when the list is empty. We don't care about that
1765 * here, so using tail_pred directly is fine.
1767 previous_tail_pred
= instructions
->tail_pred
;
1768 previous_operand_loc
= ast
->get_location();
1770 result
= ast
->hir(instructions
, state
);
1773 /* Any errors should have already been emitted in the loop above.
1775 error_emitted
= true;
1779 type
= NULL
; /* use result->type, not type. */
1780 assert(result
!= NULL
);
1782 if (result
->type
->is_error() && !error_emitted
)
1783 _mesa_glsl_error(& loc
, state
, "type mismatch");
1790 ast_expression_statement::hir(exec_list
*instructions
,
1791 struct _mesa_glsl_parse_state
*state
)
1793 /* It is possible to have expression statements that don't have an
1794 * expression. This is the solitary semicolon:
1796 * for (i = 0; i < 5; i++)
1799 * In this case the expression will be NULL. Test for NULL and don't do
1800 * anything in that case.
1802 if (expression
!= NULL
)
1803 expression
->hir(instructions
, state
);
1805 /* Statements do not have r-values.
1812 ast_compound_statement::hir(exec_list
*instructions
,
1813 struct _mesa_glsl_parse_state
*state
)
1816 state
->symbols
->push_scope();
1818 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1819 ast
->hir(instructions
, state
);
1822 state
->symbols
->pop_scope();
1824 /* Compound statements do not have r-values.
1830 static const glsl_type
*
1831 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1832 struct _mesa_glsl_parse_state
*state
)
1834 unsigned length
= 0;
1836 /* From page 19 (page 25) of the GLSL 1.20 spec:
1838 * "Only one-dimensional arrays may be declared."
1840 if (base
->is_array()) {
1841 _mesa_glsl_error(loc
, state
,
1842 "invalid array of `%s' (only one-dimensional arrays "
1845 return glsl_type::error_type
;
1848 if (array_size
!= NULL
) {
1849 exec_list dummy_instructions
;
1850 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1851 YYLTYPE loc
= array_size
->get_location();
1854 if (!ir
->type
->is_integer()) {
1855 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1856 } else if (!ir
->type
->is_scalar()) {
1857 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1859 ir_constant
*const size
= ir
->constant_expression_value();
1862 _mesa_glsl_error(& loc
, state
, "array size must be a "
1863 "constant valued expression");
1864 } else if (size
->value
.i
[0] <= 0) {
1865 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1867 assert(size
->type
== ir
->type
);
1868 length
= size
->value
.u
[0];
1870 /* If the array size is const (and we've verified that
1871 * it is) then no instructions should have been emitted
1872 * when we converted it to HIR. If they were emitted,
1873 * then either the array size isn't const after all, or
1874 * we are emitting unnecessary instructions.
1876 assert(dummy_instructions
.is_empty());
1880 } else if (state
->es_shader
) {
1881 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1882 * array declarations have been removed from the language.
1884 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1885 "allowed in GLSL ES 1.00.");
1888 return glsl_type::get_array_instance(base
, length
);
1893 ast_type_specifier::glsl_type(const char **name
,
1894 struct _mesa_glsl_parse_state
*state
) const
1896 const struct glsl_type
*type
;
1898 type
= state
->symbols
->get_type(this->type_name
);
1899 *name
= this->type_name
;
1901 if (this->is_array
) {
1902 YYLTYPE loc
= this->get_location();
1903 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1911 * Determine whether a toplevel variable declaration declares a varying. This
1912 * function operates by examining the variable's mode and the shader target,
1913 * so it correctly identifies linkage variables regardless of whether they are
1914 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1916 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1917 * this function will produce undefined results.
1920 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1924 return var
->mode
== ir_var_shader_out
;
1925 case fragment_shader
:
1926 return var
->mode
== ir_var_shader_in
;
1928 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1934 * Matrix layout qualifiers are only allowed on certain types
1937 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1939 const glsl_type
*type
)
1941 if (!type
->is_matrix() && !type
->is_record()) {
1942 _mesa_glsl_error(loc
, state
,
1943 "uniform block layout qualifiers row_major and "
1944 "column_major can only be applied to matrix and "
1946 } else if (type
->is_record()) {
1947 /* We allow 'layout(row_major)' on structure types because it's the only
1948 * way to get row-major layouts on matrices contained in structures.
1950 _mesa_glsl_warning(loc
, state
,
1951 "uniform block layout qualifiers row_major and "
1952 "column_major applied to structure types is not "
1953 "strictly conformant and my be rejected by other "
1959 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1961 struct _mesa_glsl_parse_state
*state
,
1963 bool ubo_qualifiers_valid
,
1966 if (qual
->flags
.q
.invariant
) {
1968 _mesa_glsl_error(loc
, state
,
1969 "variable `%s' may not be redeclared "
1970 "`invariant' after being used",
1977 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1978 || qual
->flags
.q
.uniform
1979 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1982 if (qual
->flags
.q
.centroid
)
1985 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1986 var
->type
= glsl_type::error_type
;
1987 _mesa_glsl_error(loc
, state
,
1988 "`attribute' variables may not be declared in the "
1990 _mesa_glsl_shader_target_name(state
->target
));
1993 /* If there is no qualifier that changes the mode of the variable, leave
1994 * the setting alone.
1996 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1997 var
->mode
= ir_var_function_inout
;
1998 else if (qual
->flags
.q
.in
)
1999 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2000 else if (qual
->flags
.q
.attribute
2001 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
2002 var
->mode
= ir_var_shader_in
;
2003 else if (qual
->flags
.q
.out
)
2004 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2005 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
2006 var
->mode
= ir_var_shader_out
;
2007 else if (qual
->flags
.q
.uniform
)
2008 var
->mode
= ir_var_uniform
;
2010 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
2011 /* This variable is being used to link data between shader stages (in
2012 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2013 * that is allowed for such purposes.
2015 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2017 * "The varying qualifier can be used only with the data types
2018 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2021 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2022 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2024 * "Fragment inputs can only be signed and unsigned integers and
2025 * integer vectors, float, floating-point vectors, matrices, or
2026 * arrays of these. Structures cannot be input.
2028 * Similar text exists in the section on vertex shader outputs.
2030 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2031 * 3.00 spec allows structs as well. Varying structs are also allowed
2034 switch (var
->type
->get_scalar_type()->base_type
) {
2035 case GLSL_TYPE_FLOAT
:
2036 /* Ok in all GLSL versions */
2038 case GLSL_TYPE_UINT
:
2040 if (state
->is_version(130, 300))
2042 _mesa_glsl_error(loc
, state
,
2043 "varying variables must be of base type float in %s",
2044 state
->get_version_string());
2046 case GLSL_TYPE_STRUCT
:
2047 if (state
->is_version(150, 300))
2049 _mesa_glsl_error(loc
, state
,
2050 "varying variables may not be of type struct");
2053 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2058 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2059 switch (state
->target
) {
2061 if (var
->mode
== ir_var_shader_out
)
2062 var
->invariant
= true;
2064 case geometry_shader
:
2065 if ((var
->mode
== ir_var_shader_in
)
2066 || (var
->mode
== ir_var_shader_out
))
2067 var
->invariant
= true;
2069 case fragment_shader
:
2070 if (var
->mode
== ir_var_shader_in
)
2071 var
->invariant
= true;
2076 if (qual
->flags
.q
.flat
)
2077 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2078 else if (qual
->flags
.q
.noperspective
)
2079 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2080 else if (qual
->flags
.q
.smooth
)
2081 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2083 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2085 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
2086 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
) &&
2087 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)) {
2088 _mesa_glsl_error(loc
, state
,
2089 "interpolation qualifier `%s' can only be applied to "
2090 "vertex shader outputs and fragment shader inputs.",
2091 var
->interpolation_string());
2094 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2095 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2096 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2097 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2098 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2099 ? "origin_upper_left" : "pixel_center_integer";
2101 _mesa_glsl_error(loc
, state
,
2102 "layout qualifier `%s' can only be applied to "
2103 "fragment shader input `gl_FragCoord'",
2107 if (qual
->flags
.q
.explicit_location
) {
2108 const bool global_scope
= (state
->current_function
== NULL
);
2110 const char *string
= "";
2112 /* In the vertex shader only shader inputs can be given explicit
2115 * In the fragment shader only shader outputs can be given explicit
2118 switch (state
->target
) {
2120 if (!global_scope
|| (var
->mode
!= ir_var_shader_in
)) {
2126 case geometry_shader
:
2127 _mesa_glsl_error(loc
, state
,
2128 "geometry shader variables cannot be given "
2129 "explicit locations\n");
2132 case fragment_shader
:
2133 if (!global_scope
|| (var
->mode
!= ir_var_shader_out
)) {
2141 _mesa_glsl_error(loc
, state
,
2142 "only %s shader %s variables can be given an "
2143 "explicit location\n",
2144 _mesa_glsl_shader_target_name(state
->target
),
2147 var
->explicit_location
= true;
2149 /* This bit of silliness is needed because invalid explicit locations
2150 * are supposed to be flagged during linking. Small negative values
2151 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2152 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2153 * The linker needs to be able to differentiate these cases. This
2154 * ensures that negative values stay negative.
2156 if (qual
->location
>= 0) {
2157 var
->location
= (state
->target
== vertex_shader
)
2158 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2159 : (qual
->location
+ FRAG_RESULT_DATA0
);
2161 var
->location
= qual
->location
;
2164 if (qual
->flags
.q
.explicit_index
) {
2165 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2166 * Layout Qualifiers):
2168 * "It is also a compile-time error if a fragment shader
2169 * sets a layout index to less than 0 or greater than 1."
2171 * Older specifications don't mandate a behavior; we take
2172 * this as a clarification and always generate the error.
2174 if (qual
->index
< 0 || qual
->index
> 1) {
2175 _mesa_glsl_error(loc
, state
,
2176 "explicit index may only be 0 or 1\n");
2178 var
->explicit_index
= true;
2179 var
->index
= qual
->index
;
2183 } else if (qual
->flags
.q
.explicit_index
) {
2184 _mesa_glsl_error(loc
, state
,
2185 "explicit index requires explicit location\n");
2188 /* Does the declaration use the 'layout' keyword?
2190 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2191 || qual
->flags
.q
.origin_upper_left
2192 || qual
->flags
.q
.explicit_location
; /* no need for index since it relies on location */
2194 /* Does the declaration use the deprecated 'attribute' or 'varying'
2197 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2198 || qual
->flags
.q
.varying
;
2200 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2201 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2202 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2203 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2204 * These extensions and all following extensions that add the 'layout'
2205 * keyword have been modified to require the use of 'in' or 'out'.
2207 * The following extension do not allow the deprecated keywords:
2209 * GL_AMD_conservative_depth
2210 * GL_ARB_conservative_depth
2211 * GL_ARB_gpu_shader5
2212 * GL_ARB_separate_shader_objects
2213 * GL_ARB_tesselation_shader
2214 * GL_ARB_transform_feedback3
2215 * GL_ARB_uniform_buffer_object
2217 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2218 * allow layout with the deprecated keywords.
2220 const bool relaxed_layout_qualifier_checking
=
2221 state
->ARB_fragment_coord_conventions_enable
;
2223 if (uses_layout
&& uses_deprecated_qualifier
) {
2224 if (relaxed_layout_qualifier_checking
) {
2225 _mesa_glsl_warning(loc
, state
,
2226 "`layout' qualifier may not be used with "
2227 "`attribute' or `varying'");
2229 _mesa_glsl_error(loc
, state
,
2230 "`layout' qualifier may not be used with "
2231 "`attribute' or `varying'");
2235 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2236 * AMD_conservative_depth.
2238 int depth_layout_count
= qual
->flags
.q
.depth_any
2239 + qual
->flags
.q
.depth_greater
2240 + qual
->flags
.q
.depth_less
2241 + qual
->flags
.q
.depth_unchanged
;
2242 if (depth_layout_count
> 0
2243 && !state
->AMD_conservative_depth_enable
2244 && !state
->ARB_conservative_depth_enable
) {
2245 _mesa_glsl_error(loc
, state
,
2246 "extension GL_AMD_conservative_depth or "
2247 "GL_ARB_conservative_depth must be enabled "
2248 "to use depth layout qualifiers");
2249 } else if (depth_layout_count
> 0
2250 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2251 _mesa_glsl_error(loc
, state
,
2252 "depth layout qualifiers can be applied only to "
2254 } else if (depth_layout_count
> 1
2255 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2256 _mesa_glsl_error(loc
, state
,
2257 "at most one depth layout qualifier can be applied to "
2260 if (qual
->flags
.q
.depth_any
)
2261 var
->depth_layout
= ir_depth_layout_any
;
2262 else if (qual
->flags
.q
.depth_greater
)
2263 var
->depth_layout
= ir_depth_layout_greater
;
2264 else if (qual
->flags
.q
.depth_less
)
2265 var
->depth_layout
= ir_depth_layout_less
;
2266 else if (qual
->flags
.q
.depth_unchanged
)
2267 var
->depth_layout
= ir_depth_layout_unchanged
;
2269 var
->depth_layout
= ir_depth_layout_none
;
2271 if (qual
->flags
.q
.std140
||
2272 qual
->flags
.q
.packed
||
2273 qual
->flags
.q
.shared
) {
2274 _mesa_glsl_error(loc
, state
,
2275 "uniform block layout qualifiers std140, packed, and "
2276 "shared can only be applied to uniform blocks, not "
2280 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2281 if (!ubo_qualifiers_valid
) {
2282 _mesa_glsl_error(loc
, state
,
2283 "uniform block layout qualifiers row_major and "
2284 "column_major can only be applied to uniform block "
2287 validate_matrix_layout_for_type(state
, loc
, var
->type
);
2292 * Get the variable that is being redeclared by this declaration
2294 * Semantic checks to verify the validity of the redeclaration are also
2295 * performed. If semantic checks fail, compilation error will be emitted via
2296 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2299 * A pointer to an existing variable in the current scope if the declaration
2300 * is a redeclaration, \c NULL otherwise.
2303 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2304 struct _mesa_glsl_parse_state
*state
)
2306 /* Check if this declaration is actually a re-declaration, either to
2307 * resize an array or add qualifiers to an existing variable.
2309 * This is allowed for variables in the current scope, or when at
2310 * global scope (for built-ins in the implicit outer scope).
2312 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2313 if (earlier
== NULL
||
2314 (state
->current_function
!= NULL
&&
2315 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2320 YYLTYPE loc
= decl
->get_location();
2322 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2324 * "It is legal to declare an array without a size and then
2325 * later re-declare the same name as an array of the same
2326 * type and specify a size."
2328 if ((earlier
->type
->array_size() == 0)
2329 && var
->type
->is_array()
2330 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2331 /* FINISHME: This doesn't match the qualifiers on the two
2332 * FINISHME: declarations. It's not 100% clear whether this is
2333 * FINISHME: required or not.
2336 const unsigned size
= unsigned(var
->type
->array_size());
2337 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2338 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2339 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2341 earlier
->max_array_access
);
2344 earlier
->type
= var
->type
;
2347 } else if (state
->ARB_fragment_coord_conventions_enable
2348 && strcmp(var
->name
, "gl_FragCoord") == 0
2349 && earlier
->type
== var
->type
2350 && earlier
->mode
== var
->mode
) {
2351 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2354 earlier
->origin_upper_left
= var
->origin_upper_left
;
2355 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2357 /* According to section 4.3.7 of the GLSL 1.30 spec,
2358 * the following built-in varaibles can be redeclared with an
2359 * interpolation qualifier:
2362 * * gl_FrontSecondaryColor
2363 * * gl_BackSecondaryColor
2365 * * gl_SecondaryColor
2367 } else if (state
->is_version(130, 0)
2368 && (strcmp(var
->name
, "gl_FrontColor") == 0
2369 || strcmp(var
->name
, "gl_BackColor") == 0
2370 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2371 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2372 || strcmp(var
->name
, "gl_Color") == 0
2373 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2374 && earlier
->type
== var
->type
2375 && earlier
->mode
== var
->mode
) {
2376 earlier
->interpolation
= var
->interpolation
;
2378 /* Layout qualifiers for gl_FragDepth. */
2379 } else if ((state
->AMD_conservative_depth_enable
||
2380 state
->ARB_conservative_depth_enable
)
2381 && strcmp(var
->name
, "gl_FragDepth") == 0
2382 && earlier
->type
== var
->type
2383 && earlier
->mode
== var
->mode
) {
2385 /** From the AMD_conservative_depth spec:
2386 * Within any shader, the first redeclarations of gl_FragDepth
2387 * must appear before any use of gl_FragDepth.
2389 if (earlier
->used
) {
2390 _mesa_glsl_error(&loc
, state
,
2391 "the first redeclaration of gl_FragDepth "
2392 "must appear before any use of gl_FragDepth");
2395 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2396 if (earlier
->depth_layout
!= ir_depth_layout_none
2397 && earlier
->depth_layout
!= var
->depth_layout
) {
2398 _mesa_glsl_error(&loc
, state
,
2399 "gl_FragDepth: depth layout is declared here "
2400 "as '%s, but it was previously declared as "
2402 depth_layout_string(var
->depth_layout
),
2403 depth_layout_string(earlier
->depth_layout
));
2406 earlier
->depth_layout
= var
->depth_layout
;
2409 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2416 * Generate the IR for an initializer in a variable declaration
2419 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2420 ast_fully_specified_type
*type
,
2421 exec_list
*initializer_instructions
,
2422 struct _mesa_glsl_parse_state
*state
)
2424 ir_rvalue
*result
= NULL
;
2426 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2428 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2430 * "All uniform variables are read-only and are initialized either
2431 * directly by an application via API commands, or indirectly by
2434 if (var
->mode
== ir_var_uniform
) {
2435 state
->check_version(120, 0, &initializer_loc
,
2436 "cannot initialize uniforms");
2439 if (var
->type
->is_sampler()) {
2440 _mesa_glsl_error(& initializer_loc
, state
,
2441 "cannot initialize samplers");
2444 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2445 _mesa_glsl_error(& initializer_loc
, state
,
2446 "cannot initialize %s shader input / %s",
2447 _mesa_glsl_shader_target_name(state
->target
),
2448 (state
->target
== vertex_shader
)
2449 ? "attribute" : "varying");
2452 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2453 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2456 /* Calculate the constant value if this is a const or uniform
2459 if (type
->qualifier
.flags
.q
.constant
2460 || type
->qualifier
.flags
.q
.uniform
) {
2461 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2462 if (new_rhs
!= NULL
) {
2465 ir_constant
*constant_value
= rhs
->constant_expression_value();
2466 if (!constant_value
) {
2467 _mesa_glsl_error(& initializer_loc
, state
,
2468 "initializer of %s variable `%s' must be a "
2469 "constant expression",
2470 (type
->qualifier
.flags
.q
.constant
)
2471 ? "const" : "uniform",
2473 if (var
->type
->is_numeric()) {
2474 /* Reduce cascading errors. */
2475 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2478 rhs
= constant_value
;
2479 var
->constant_value
= constant_value
;
2482 _mesa_glsl_error(&initializer_loc
, state
,
2483 "initializer of type %s cannot be assigned to "
2484 "variable of type %s",
2485 rhs
->type
->name
, var
->type
->name
);
2486 if (var
->type
->is_numeric()) {
2487 /* Reduce cascading errors. */
2488 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2493 if (rhs
&& !rhs
->type
->is_error()) {
2494 bool temp
= var
->read_only
;
2495 if (type
->qualifier
.flags
.q
.constant
)
2496 var
->read_only
= false;
2498 /* Never emit code to initialize a uniform.
2500 const glsl_type
*initializer_type
;
2501 if (!type
->qualifier
.flags
.q
.uniform
) {
2502 result
= do_assignment(initializer_instructions
, state
,
2505 type
->get_location());
2506 initializer_type
= result
->type
;
2508 initializer_type
= rhs
->type
;
2510 var
->constant_initializer
= rhs
->constant_expression_value();
2511 var
->has_initializer
= true;
2513 /* If the declared variable is an unsized array, it must inherrit
2514 * its full type from the initializer. A declaration such as
2516 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2520 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2522 * The assignment generated in the if-statement (below) will also
2523 * automatically handle this case for non-uniforms.
2525 * If the declared variable is not an array, the types must
2526 * already match exactly. As a result, the type assignment
2527 * here can be done unconditionally. For non-uniforms the call
2528 * to do_assignment can change the type of the initializer (via
2529 * the implicit conversion rules). For uniforms the initializer
2530 * must be a constant expression, and the type of that expression
2531 * was validated above.
2533 var
->type
= initializer_type
;
2535 var
->read_only
= temp
;
2542 ast_declarator_list::hir(exec_list
*instructions
,
2543 struct _mesa_glsl_parse_state
*state
)
2546 const struct glsl_type
*decl_type
;
2547 const char *type_name
= NULL
;
2548 ir_rvalue
*result
= NULL
;
2549 YYLTYPE loc
= this->get_location();
2551 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2553 * "To ensure that a particular output variable is invariant, it is
2554 * necessary to use the invariant qualifier. It can either be used to
2555 * qualify a previously declared variable as being invariant
2557 * invariant gl_Position; // make existing gl_Position be invariant"
2559 * In these cases the parser will set the 'invariant' flag in the declarator
2560 * list, and the type will be NULL.
2562 if (this->invariant
) {
2563 assert(this->type
== NULL
);
2565 if (state
->current_function
!= NULL
) {
2566 _mesa_glsl_error(& loc
, state
,
2567 "All uses of `invariant' keyword must be at global "
2571 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2572 assert(!decl
->is_array
);
2573 assert(decl
->array_size
== NULL
);
2574 assert(decl
->initializer
== NULL
);
2576 ir_variable
*const earlier
=
2577 state
->symbols
->get_variable(decl
->identifier
);
2578 if (earlier
== NULL
) {
2579 _mesa_glsl_error(& loc
, state
,
2580 "Undeclared variable `%s' cannot be marked "
2581 "invariant\n", decl
->identifier
);
2582 } else if ((state
->target
== vertex_shader
)
2583 && (earlier
->mode
!= ir_var_shader_out
)) {
2584 _mesa_glsl_error(& loc
, state
,
2585 "`%s' cannot be marked invariant, vertex shader "
2586 "outputs only\n", decl
->identifier
);
2587 } else if ((state
->target
== fragment_shader
)
2588 && (earlier
->mode
!= ir_var_shader_in
)) {
2589 _mesa_glsl_error(& loc
, state
,
2590 "`%s' cannot be marked invariant, fragment shader "
2591 "inputs only\n", decl
->identifier
);
2592 } else if (earlier
->used
) {
2593 _mesa_glsl_error(& loc
, state
,
2594 "variable `%s' may not be redeclared "
2595 "`invariant' after being used",
2598 earlier
->invariant
= true;
2602 /* Invariant redeclarations do not have r-values.
2607 assert(this->type
!= NULL
);
2608 assert(!this->invariant
);
2610 /* The type specifier may contain a structure definition. Process that
2611 * before any of the variable declarations.
2613 (void) this->type
->specifier
->hir(instructions
, state
);
2615 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2616 if (this->declarations
.is_empty()) {
2617 /* If there is no structure involved in the program text, there are two
2618 * possible scenarios:
2620 * - The program text contained something like 'vec4;'. This is an
2621 * empty declaration. It is valid but weird. Emit a warning.
2623 * - The program text contained something like 'S;' and 'S' is not the
2624 * name of a known structure type. This is both invalid and weird.
2627 * Note that if decl_type is NULL and there is a structure involved,
2628 * there must have been some sort of error with the structure. In this
2629 * case we assume that an error was already generated on this line of
2630 * code for the structure. There is no need to generate an additional,
2633 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2635 if (this->type
->specifier
->structure
== NULL
) {
2636 if (decl_type
!= NULL
) {
2637 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2639 _mesa_glsl_error(&loc
, state
,
2640 "invalid type `%s' in empty declaration",
2646 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2647 const struct glsl_type
*var_type
;
2650 /* FINISHME: Emit a warning if a variable declaration shadows a
2651 * FINISHME: declaration at a higher scope.
2654 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2655 if (type_name
!= NULL
) {
2656 _mesa_glsl_error(& loc
, state
,
2657 "invalid type `%s' in declaration of `%s'",
2658 type_name
, decl
->identifier
);
2660 _mesa_glsl_error(& loc
, state
,
2661 "invalid type in declaration of `%s'",
2667 if (decl
->is_array
) {
2668 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2670 if (var_type
->is_error())
2673 var_type
= decl_type
;
2676 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2678 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2680 * "Global variables can only use the qualifiers const,
2681 * attribute, uni form, or varying. Only one may be
2684 * Local variables can only use the qualifier const."
2686 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2687 * any extension that adds the 'layout' keyword.
2689 if (!state
->is_version(130, 300)
2690 && !state
->ARB_explicit_attrib_location_enable
2691 && !state
->ARB_fragment_coord_conventions_enable
) {
2692 if (this->type
->qualifier
.flags
.q
.out
) {
2693 _mesa_glsl_error(& loc
, state
,
2694 "`out' qualifier in declaration of `%s' "
2695 "only valid for function parameters in %s.",
2696 decl
->identifier
, state
->get_version_string());
2698 if (this->type
->qualifier
.flags
.q
.in
) {
2699 _mesa_glsl_error(& loc
, state
,
2700 "`in' qualifier in declaration of `%s' "
2701 "only valid for function parameters in %s.",
2702 decl
->identifier
, state
->get_version_string());
2704 /* FINISHME: Test for other invalid qualifiers. */
2707 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2708 & loc
, this->ubo_qualifiers_valid
, false);
2710 if (this->type
->qualifier
.flags
.q
.invariant
) {
2711 if ((state
->target
== vertex_shader
) &&
2712 var
->mode
!= ir_var_shader_out
) {
2713 _mesa_glsl_error(& loc
, state
,
2714 "`%s' cannot be marked invariant, vertex shader "
2715 "outputs only\n", var
->name
);
2716 } else if ((state
->target
== fragment_shader
) &&
2717 var
->mode
!= ir_var_shader_in
) {
2718 /* FINISHME: Note that this doesn't work for invariant on
2719 * a function signature inval
2721 _mesa_glsl_error(& loc
, state
,
2722 "`%s' cannot be marked invariant, fragment shader "
2723 "inputs only\n", var
->name
);
2727 if (state
->current_function
!= NULL
) {
2728 const char *mode
= NULL
;
2729 const char *extra
= "";
2731 /* There is no need to check for 'inout' here because the parser will
2732 * only allow that in function parameter lists.
2734 if (this->type
->qualifier
.flags
.q
.attribute
) {
2736 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2738 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2740 } else if (this->type
->qualifier
.flags
.q
.in
) {
2742 extra
= " or in function parameter list";
2743 } else if (this->type
->qualifier
.flags
.q
.out
) {
2745 extra
= " or in function parameter list";
2749 _mesa_glsl_error(& loc
, state
,
2750 "%s variable `%s' must be declared at "
2752 mode
, var
->name
, extra
);
2754 } else if (var
->mode
== ir_var_shader_in
) {
2755 var
->read_only
= true;
2757 if (state
->target
== vertex_shader
) {
2758 bool error_emitted
= false;
2760 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2762 * "Vertex shader inputs can only be float, floating-point
2763 * vectors, matrices, signed and unsigned integers and integer
2764 * vectors. Vertex shader inputs can also form arrays of these
2765 * types, but not structures."
2767 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2769 * "Vertex shader inputs can only be float, floating-point
2770 * vectors, matrices, signed and unsigned integers and integer
2771 * vectors. They cannot be arrays or structures."
2773 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2775 * "The attribute qualifier can be used only with float,
2776 * floating-point vectors, and matrices. Attribute variables
2777 * cannot be declared as arrays or structures."
2779 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
2781 * "Vertex shader inputs can only be float, floating-point
2782 * vectors, matrices, signed and unsigned integers and integer
2783 * vectors. Vertex shader inputs cannot be arrays or
2786 const glsl_type
*check_type
= var
->type
->is_array()
2787 ? var
->type
->fields
.array
: var
->type
;
2789 switch (check_type
->base_type
) {
2790 case GLSL_TYPE_FLOAT
:
2792 case GLSL_TYPE_UINT
:
2794 if (state
->is_version(120, 300))
2798 _mesa_glsl_error(& loc
, state
,
2799 "vertex shader input / attribute cannot have "
2801 var
->type
->is_array() ? "array of " : "",
2803 error_emitted
= true;
2806 if (!error_emitted
&& var
->type
->is_array() &&
2807 !state
->check_version(140, 0, &loc
,
2808 "vertex shader input / attribute "
2809 "cannot have array type")) {
2810 error_emitted
= true;
2815 /* Integer vertex outputs must be qualified with 'flat'.
2817 * From section 4.3.6 of the GLSL 1.30 spec:
2818 * "If a vertex output is a signed or unsigned integer or integer
2819 * vector, then it must be qualified with the interpolation qualifier
2822 * From section 4.3.4 of the GLSL 3.00 ES spec:
2823 * "Fragment shader inputs that are signed or unsigned integers or
2824 * integer vectors must be qualified with the interpolation qualifier
2827 * Since vertex outputs and fragment inputs must have matching
2828 * qualifiers, these two requirements are equivalent.
2830 if (state
->is_version(130, 300)
2831 && state
->target
== vertex_shader
2832 && state
->current_function
== NULL
2833 && var
->type
->is_integer()
2834 && var
->mode
== ir_var_shader_out
2835 && var
->interpolation
!= INTERP_QUALIFIER_FLAT
) {
2837 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2838 "then it must be qualified with 'flat'");
2842 /* Interpolation qualifiers cannot be applied to 'centroid' and
2843 * 'centroid varying'.
2845 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2846 * "interpolation qualifiers may only precede the qualifiers in,
2847 * centroid in, out, or centroid out in a declaration. They do not apply
2848 * to the deprecated storage qualifiers varying or centroid varying."
2850 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2852 if (state
->is_version(130, 0)
2853 && this->type
->qualifier
.has_interpolation()
2854 && this->type
->qualifier
.flags
.q
.varying
) {
2856 const char *i
= this->type
->qualifier
.interpolation_string();
2859 if (this->type
->qualifier
.flags
.q
.centroid
)
2860 s
= "centroid varying";
2864 _mesa_glsl_error(&loc
, state
,
2865 "qualifier '%s' cannot be applied to the "
2866 "deprecated storage qualifier '%s'", i
, s
);
2870 /* Interpolation qualifiers can only apply to vertex shader outputs and
2871 * fragment shader inputs.
2873 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2874 * "Outputs from a vertex shader (out) and inputs to a fragment
2875 * shader (in) can be further qualified with one or more of these
2876 * interpolation qualifiers"
2878 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
2879 * "These interpolation qualifiers may only precede the qualifiers
2880 * in, centroid in, out, or centroid out in a declaration. They do
2881 * not apply to inputs into a vertex shader or outputs from a
2884 if (state
->is_version(130, 300)
2885 && this->type
->qualifier
.has_interpolation()) {
2887 const char *i
= this->type
->qualifier
.interpolation_string();
2890 switch (state
->target
) {
2892 if (this->type
->qualifier
.flags
.q
.in
) {
2893 _mesa_glsl_error(&loc
, state
,
2894 "qualifier '%s' cannot be applied to vertex "
2895 "shader inputs", i
);
2898 case fragment_shader
:
2899 if (this->type
->qualifier
.flags
.q
.out
) {
2900 _mesa_glsl_error(&loc
, state
,
2901 "qualifier '%s' cannot be applied to fragment "
2902 "shader outputs", i
);
2911 /* From section 4.3.4 of the GLSL 1.30 spec:
2912 * "It is an error to use centroid in in a vertex shader."
2914 * From section 4.3.4 of the GLSL ES 3.00 spec:
2915 * "It is an error to use centroid in or interpolation qualifiers in
2916 * a vertex shader input."
2918 if (state
->is_version(130, 300)
2919 && this->type
->qualifier
.flags
.q
.centroid
2920 && this->type
->qualifier
.flags
.q
.in
2921 && state
->target
== vertex_shader
) {
2923 _mesa_glsl_error(&loc
, state
,
2924 "'centroid in' cannot be used in a vertex shader");
2928 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2930 if (this->type
->specifier
->precision
!= ast_precision_none
) {
2931 state
->check_precision_qualifiers_allowed(&loc
);
2935 /* Precision qualifiers only apply to floating point and integer types.
2937 * From section 4.5.2 of the GLSL 1.30 spec:
2938 * "Any floating point or any integer declaration can have the type
2939 * preceded by one of these precision qualifiers [...] Literal
2940 * constants do not have precision qualifiers. Neither do Boolean
2943 * In GLSL ES, sampler types are also allowed.
2945 * From page 87 of the GLSL ES spec:
2946 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2948 if (this->type
->specifier
->precision
!= ast_precision_none
2949 && !var
->type
->is_float()
2950 && !var
->type
->is_integer()
2951 && !(var
->type
->is_sampler() && state
->es_shader
)
2952 && !(var
->type
->is_array()
2953 && (var
->type
->fields
.array
->is_float()
2954 || var
->type
->fields
.array
->is_integer()))) {
2956 _mesa_glsl_error(&loc
, state
,
2957 "precision qualifiers apply only to floating point"
2958 "%s types", state
->es_shader
? ", integer, and sampler"
2962 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2964 * "[Sampler types] can only be declared as function
2965 * parameters or uniform variables (see Section 4.3.5
2968 if (var_type
->contains_sampler() &&
2969 !this->type
->qualifier
.flags
.q
.uniform
) {
2970 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2973 /* Process the initializer and add its instructions to a temporary
2974 * list. This list will be added to the instruction stream (below) after
2975 * the declaration is added. This is done because in some cases (such as
2976 * redeclarations) the declaration may not actually be added to the
2977 * instruction stream.
2979 exec_list initializer_instructions
;
2980 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2982 if (decl
->initializer
!= NULL
) {
2983 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2985 &initializer_instructions
, state
);
2988 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2990 * "It is an error to write to a const variable outside of
2991 * its declaration, so they must be initialized when
2994 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2995 _mesa_glsl_error(& loc
, state
,
2996 "const declaration of `%s' must be initialized",
3000 /* If the declaration is not a redeclaration, there are a few additional
3001 * semantic checks that must be applied. In addition, variable that was
3002 * created for the declaration should be added to the IR stream.
3004 if (earlier
== NULL
) {
3005 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3007 * "Identifiers starting with "gl_" are reserved for use by
3008 * OpenGL, and may not be declared in a shader as either a
3009 * variable or a function."
3011 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
3012 _mesa_glsl_error(& loc
, state
,
3013 "identifier `%s' uses reserved `gl_' prefix",
3015 else if (strstr(decl
->identifier
, "__")) {
3016 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3019 * "In addition, all identifiers containing two
3020 * consecutive underscores (__) are reserved as
3021 * possible future keywords."
3023 _mesa_glsl_error(& loc
, state
,
3024 "identifier `%s' uses reserved `__' string",
3028 /* Add the variable to the symbol table. Note that the initializer's
3029 * IR was already processed earlier (though it hasn't been emitted
3030 * yet), without the variable in scope.
3032 * This differs from most C-like languages, but it follows the GLSL
3033 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3036 * "Within a declaration, the scope of a name starts immediately
3037 * after the initializer if present or immediately after the name
3038 * being declared if not."
3040 if (!state
->symbols
->add_variable(var
)) {
3041 YYLTYPE loc
= this->get_location();
3042 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3043 "current scope", decl
->identifier
);
3047 /* Push the variable declaration to the top. It means that all the
3048 * variable declarations will appear in a funny last-to-first order,
3049 * but otherwise we run into trouble if a function is prototyped, a
3050 * global var is decled, then the function is defined with usage of
3051 * the global var. See glslparsertest's CorrectModule.frag.
3053 instructions
->push_head(var
);
3056 instructions
->append_list(&initializer_instructions
);
3060 /* Generally, variable declarations do not have r-values. However,
3061 * one is used for the declaration in
3063 * while (bool b = some_condition()) {
3067 * so we return the rvalue from the last seen declaration here.
3074 ast_parameter_declarator::hir(exec_list
*instructions
,
3075 struct _mesa_glsl_parse_state
*state
)
3078 const struct glsl_type
*type
;
3079 const char *name
= NULL
;
3080 YYLTYPE loc
= this->get_location();
3082 type
= this->type
->specifier
->glsl_type(& name
, state
);
3086 _mesa_glsl_error(& loc
, state
,
3087 "invalid type `%s' in declaration of `%s'",
3088 name
, this->identifier
);
3090 _mesa_glsl_error(& loc
, state
,
3091 "invalid type in declaration of `%s'",
3095 type
= glsl_type::error_type
;
3098 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3100 * "Functions that accept no input arguments need not use void in the
3101 * argument list because prototypes (or definitions) are required and
3102 * therefore there is no ambiguity when an empty argument list "( )" is
3103 * declared. The idiom "(void)" as a parameter list is provided for
3106 * Placing this check here prevents a void parameter being set up
3107 * for a function, which avoids tripping up checks for main taking
3108 * parameters and lookups of an unnamed symbol.
3110 if (type
->is_void()) {
3111 if (this->identifier
!= NULL
)
3112 _mesa_glsl_error(& loc
, state
,
3113 "named parameter cannot have type `void'");
3119 if (formal_parameter
&& (this->identifier
== NULL
)) {
3120 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3124 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3125 * call already handled the "vec4[..] foo" case.
3127 if (this->is_array
) {
3128 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3131 if (!type
->is_error() && type
->array_size() == 0) {
3132 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3133 "a declared size.");
3134 type
= glsl_type::error_type
;
3138 ir_variable
*var
= new(ctx
)
3139 ir_variable(type
, this->identifier
, ir_var_function_in
);
3141 /* Apply any specified qualifiers to the parameter declaration. Note that
3142 * for function parameters the default mode is 'in'.
3144 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3147 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3149 * "Samplers cannot be treated as l-values; hence cannot be used
3150 * as out or inout function parameters, nor can they be assigned
3153 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3154 && type
->contains_sampler()) {
3155 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3156 type
= glsl_type::error_type
;
3159 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3161 * "When calling a function, expressions that do not evaluate to
3162 * l-values cannot be passed to parameters declared as out or inout."
3164 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3166 * "Other binary or unary expressions, non-dereferenced arrays,
3167 * function names, swizzles with repeated fields, and constants
3168 * cannot be l-values."
3170 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3171 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3173 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3175 && !state
->check_version(120, 100, &loc
,
3176 "Arrays cannot be out or inout parameters")) {
3177 type
= glsl_type::error_type
;
3180 instructions
->push_tail(var
);
3182 /* Parameter declarations do not have r-values.
3189 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3191 exec_list
*ir_parameters
,
3192 _mesa_glsl_parse_state
*state
)
3194 ast_parameter_declarator
*void_param
= NULL
;
3197 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3198 param
->formal_parameter
= formal
;
3199 param
->hir(ir_parameters
, state
);
3207 if ((void_param
!= NULL
) && (count
> 1)) {
3208 YYLTYPE loc
= void_param
->get_location();
3210 _mesa_glsl_error(& loc
, state
,
3211 "`void' parameter must be only parameter");
3217 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3219 /* IR invariants disallow function declarations or definitions
3220 * nested within other function definitions. But there is no
3221 * requirement about the relative order of function declarations
3222 * and definitions with respect to one another. So simply insert
3223 * the new ir_function block at the end of the toplevel instruction
3226 state
->toplevel_ir
->push_tail(f
);
3231 ast_function::hir(exec_list
*instructions
,
3232 struct _mesa_glsl_parse_state
*state
)
3235 ir_function
*f
= NULL
;
3236 ir_function_signature
*sig
= NULL
;
3237 exec_list hir_parameters
;
3239 const char *const name
= identifier
;
3241 /* New functions are always added to the top-level IR instruction stream,
3242 * so this instruction list pointer is ignored. See also emit_function
3245 (void) instructions
;
3247 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3249 * "Function declarations (prototypes) cannot occur inside of functions;
3250 * they must be at global scope, or for the built-in functions, outside
3251 * the global scope."
3253 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3255 * "User defined functions may only be defined within the global scope."
3257 * Note that this language does not appear in GLSL 1.10.
3259 if ((state
->current_function
!= NULL
) &&
3260 state
->is_version(120, 100)) {
3261 YYLTYPE loc
= this->get_location();
3262 _mesa_glsl_error(&loc
, state
,
3263 "declaration of function `%s' not allowed within "
3264 "function body", name
);
3267 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3269 * "Identifiers starting with "gl_" are reserved for use by
3270 * OpenGL, and may not be declared in a shader as either a
3271 * variable or a function."
3273 if (strncmp(name
, "gl_", 3) == 0) {
3274 YYLTYPE loc
= this->get_location();
3275 _mesa_glsl_error(&loc
, state
,
3276 "identifier `%s' uses reserved `gl_' prefix", name
);
3279 /* Convert the list of function parameters to HIR now so that they can be
3280 * used below to compare this function's signature with previously seen
3281 * signatures for functions with the same name.
3283 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3285 & hir_parameters
, state
);
3287 const char *return_type_name
;
3288 const glsl_type
*return_type
=
3289 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3292 YYLTYPE loc
= this->get_location();
3293 _mesa_glsl_error(&loc
, state
,
3294 "function `%s' has undeclared return type `%s'",
3295 name
, return_type_name
);
3296 return_type
= glsl_type::error_type
;
3299 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3300 * "No qualifier is allowed on the return type of a function."
3302 if (this->return_type
->has_qualifiers()) {
3303 YYLTYPE loc
= this->get_location();
3304 _mesa_glsl_error(& loc
, state
,
3305 "function `%s' return type has qualifiers", name
);
3308 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3310 * "[Sampler types] can only be declared as function parameters
3311 * or uniform variables (see Section 4.3.5 "Uniform")".
3313 if (return_type
->contains_sampler()) {
3314 YYLTYPE loc
= this->get_location();
3315 _mesa_glsl_error(&loc
, state
,
3316 "function `%s' return type can't contain a sampler",
3320 /* Verify that this function's signature either doesn't match a previously
3321 * seen signature for a function with the same name, or, if a match is found,
3322 * that the previously seen signature does not have an associated definition.
3324 f
= state
->symbols
->get_function(name
);
3325 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3326 sig
= f
->exact_matching_signature(&hir_parameters
);
3328 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3329 if (badvar
!= NULL
) {
3330 YYLTYPE loc
= this->get_location();
3332 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3333 "qualifiers don't match prototype", name
, badvar
);
3336 if (sig
->return_type
!= return_type
) {
3337 YYLTYPE loc
= this->get_location();
3339 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3340 "match prototype", name
);
3343 if (is_definition
&& sig
->is_defined
) {
3344 YYLTYPE loc
= this->get_location();
3346 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3350 f
= new(ctx
) ir_function(name
);
3351 if (!state
->symbols
->add_function(f
)) {
3352 /* This function name shadows a non-function use of the same name. */
3353 YYLTYPE loc
= this->get_location();
3355 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3356 "non-function", name
);
3360 emit_function(state
, f
);
3363 /* Verify the return type of main() */
3364 if (strcmp(name
, "main") == 0) {
3365 if (! return_type
->is_void()) {
3366 YYLTYPE loc
= this->get_location();
3368 _mesa_glsl_error(& loc
, state
, "main() must return void");
3371 if (!hir_parameters
.is_empty()) {
3372 YYLTYPE loc
= this->get_location();
3374 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3378 /* Finish storing the information about this new function in its signature.
3381 sig
= new(ctx
) ir_function_signature(return_type
);
3382 f
->add_signature(sig
);
3385 sig
->replace_parameters(&hir_parameters
);
3388 /* Function declarations (prototypes) do not have r-values.
3395 ast_function_definition::hir(exec_list
*instructions
,
3396 struct _mesa_glsl_parse_state
*state
)
3398 prototype
->is_definition
= true;
3399 prototype
->hir(instructions
, state
);
3401 ir_function_signature
*signature
= prototype
->signature
;
3402 if (signature
== NULL
)
3405 assert(state
->current_function
== NULL
);
3406 state
->current_function
= signature
;
3407 state
->found_return
= false;
3409 /* Duplicate parameters declared in the prototype as concrete variables.
3410 * Add these to the symbol table.
3412 state
->symbols
->push_scope();
3413 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3414 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3416 assert(var
!= NULL
);
3418 /* The only way a parameter would "exist" is if two parameters have
3421 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3422 YYLTYPE loc
= this->get_location();
3424 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3426 state
->symbols
->add_variable(var
);
3430 /* Convert the body of the function to HIR. */
3431 this->body
->hir(&signature
->body
, state
);
3432 signature
->is_defined
= true;
3434 state
->symbols
->pop_scope();
3436 assert(state
->current_function
== signature
);
3437 state
->current_function
= NULL
;
3439 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3440 YYLTYPE loc
= this->get_location();
3441 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3442 "%s, but no return statement",
3443 signature
->function_name(),
3444 signature
->return_type
->name
);
3447 /* Function definitions do not have r-values.
3454 ast_jump_statement::hir(exec_list
*instructions
,
3455 struct _mesa_glsl_parse_state
*state
)
3462 assert(state
->current_function
);
3464 if (opt_return_value
) {
3465 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3467 /* The value of the return type can be NULL if the shader says
3468 * 'return foo();' and foo() is a function that returns void.
3470 * NOTE: The GLSL spec doesn't say that this is an error. The type
3471 * of the return value is void. If the return type of the function is
3472 * also void, then this should compile without error. Seriously.
3474 const glsl_type
*const ret_type
=
3475 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3477 /* Implicit conversions are not allowed for return values. */
3478 if (state
->current_function
->return_type
!= ret_type
) {
3479 YYLTYPE loc
= this->get_location();
3481 _mesa_glsl_error(& loc
, state
,
3482 "`return' with wrong type %s, in function `%s' "
3485 state
->current_function
->function_name(),
3486 state
->current_function
->return_type
->name
);
3489 inst
= new(ctx
) ir_return(ret
);
3491 if (state
->current_function
->return_type
->base_type
!=
3493 YYLTYPE loc
= this->get_location();
3495 _mesa_glsl_error(& loc
, state
,
3496 "`return' with no value, in function %s returning "
3498 state
->current_function
->function_name());
3500 inst
= new(ctx
) ir_return
;
3503 state
->found_return
= true;
3504 instructions
->push_tail(inst
);
3509 if (state
->target
!= fragment_shader
) {
3510 YYLTYPE loc
= this->get_location();
3512 _mesa_glsl_error(& loc
, state
,
3513 "`discard' may only appear in a fragment shader");
3515 instructions
->push_tail(new(ctx
) ir_discard
);
3520 if (mode
== ast_continue
&&
3521 state
->loop_nesting_ast
== NULL
) {
3522 YYLTYPE loc
= this->get_location();
3524 _mesa_glsl_error(& loc
, state
,
3525 "continue may only appear in a loop");
3526 } else if (mode
== ast_break
&&
3527 state
->loop_nesting_ast
== NULL
&&
3528 state
->switch_state
.switch_nesting_ast
== NULL
) {
3529 YYLTYPE loc
= this->get_location();
3531 _mesa_glsl_error(& loc
, state
,
3532 "break may only appear in a loop or a switch");
3534 /* For a loop, inline the for loop expression again,
3535 * since we don't know where near the end of
3536 * the loop body the normal copy of it
3537 * is going to be placed.
3539 if (state
->loop_nesting_ast
!= NULL
&&
3540 mode
== ast_continue
&&
3541 state
->loop_nesting_ast
->rest_expression
) {
3542 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3546 if (state
->switch_state
.is_switch_innermost
&&
3547 mode
== ast_break
) {
3548 /* Force break out of switch by setting is_break switch state.
3550 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3551 ir_dereference_variable
*const deref_is_break_var
=
3552 new(ctx
) ir_dereference_variable(is_break_var
);
3553 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3554 ir_assignment
*const set_break_var
=
3555 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3557 instructions
->push_tail(set_break_var
);
3560 ir_loop_jump
*const jump
=
3561 new(ctx
) ir_loop_jump((mode
== ast_break
)
3562 ? ir_loop_jump::jump_break
3563 : ir_loop_jump::jump_continue
);
3564 instructions
->push_tail(jump
);
3571 /* Jump instructions do not have r-values.
3578 ast_selection_statement::hir(exec_list
*instructions
,
3579 struct _mesa_glsl_parse_state
*state
)
3583 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3585 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3587 * "Any expression whose type evaluates to a Boolean can be used as the
3588 * conditional expression bool-expression. Vector types are not accepted
3589 * as the expression to if."
3591 * The checks are separated so that higher quality diagnostics can be
3592 * generated for cases where both rules are violated.
3594 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3595 YYLTYPE loc
= this->condition
->get_location();
3597 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3601 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3603 if (then_statement
!= NULL
) {
3604 state
->symbols
->push_scope();
3605 then_statement
->hir(& stmt
->then_instructions
, state
);
3606 state
->symbols
->pop_scope();
3609 if (else_statement
!= NULL
) {
3610 state
->symbols
->push_scope();
3611 else_statement
->hir(& stmt
->else_instructions
, state
);
3612 state
->symbols
->pop_scope();
3615 instructions
->push_tail(stmt
);
3617 /* if-statements do not have r-values.
3624 ast_switch_statement::hir(exec_list
*instructions
,
3625 struct _mesa_glsl_parse_state
*state
)
3629 ir_rvalue
*const test_expression
=
3630 this->test_expression
->hir(instructions
, state
);
3632 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3634 * "The type of init-expression in a switch statement must be a
3637 if (!test_expression
->type
->is_scalar() ||
3638 !test_expression
->type
->is_integer()) {
3639 YYLTYPE loc
= this->test_expression
->get_location();
3641 _mesa_glsl_error(& loc
,
3643 "switch-statement expression must be scalar "
3647 /* Track the switch-statement nesting in a stack-like manner.
3649 struct glsl_switch_state saved
= state
->switch_state
;
3651 state
->switch_state
.is_switch_innermost
= true;
3652 state
->switch_state
.switch_nesting_ast
= this;
3653 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3654 hash_table_pointer_compare
);
3655 state
->switch_state
.previous_default
= NULL
;
3657 /* Initalize is_fallthru state to false.
3659 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3660 state
->switch_state
.is_fallthru_var
=
3661 new(ctx
) ir_variable(glsl_type::bool_type
,
3662 "switch_is_fallthru_tmp",
3664 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3666 ir_dereference_variable
*deref_is_fallthru_var
=
3667 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3668 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3671 /* Initalize is_break state to false.
3673 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3674 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3675 "switch_is_break_tmp",
3677 instructions
->push_tail(state
->switch_state
.is_break_var
);
3679 ir_dereference_variable
*deref_is_break_var
=
3680 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3681 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3684 /* Cache test expression.
3686 test_to_hir(instructions
, state
);
3688 /* Emit code for body of switch stmt.
3690 body
->hir(instructions
, state
);
3692 hash_table_dtor(state
->switch_state
.labels_ht
);
3694 state
->switch_state
= saved
;
3696 /* Switch statements do not have r-values. */
3702 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3703 struct _mesa_glsl_parse_state
*state
)
3707 /* Cache value of test expression. */
3708 ir_rvalue
*const test_val
=
3709 test_expression
->hir(instructions
,
3712 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3715 ir_dereference_variable
*deref_test_var
=
3716 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3718 instructions
->push_tail(state
->switch_state
.test_var
);
3719 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
3724 ast_switch_body::hir(exec_list
*instructions
,
3725 struct _mesa_glsl_parse_state
*state
)
3728 stmts
->hir(instructions
, state
);
3730 /* Switch bodies do not have r-values. */
3735 ast_case_statement_list::hir(exec_list
*instructions
,
3736 struct _mesa_glsl_parse_state
*state
)
3738 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3739 case_stmt
->hir(instructions
, state
);
3741 /* Case statements do not have r-values. */
3746 ast_case_statement::hir(exec_list
*instructions
,
3747 struct _mesa_glsl_parse_state
*state
)
3749 labels
->hir(instructions
, state
);
3751 /* Conditionally set fallthru state based on break state. */
3752 ir_constant
*const false_val
= new(state
) ir_constant(false);
3753 ir_dereference_variable
*const deref_is_fallthru_var
=
3754 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3755 ir_dereference_variable
*const deref_is_break_var
=
3756 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3757 ir_assignment
*const reset_fallthru_on_break
=
3758 new(state
) ir_assignment(deref_is_fallthru_var
,
3760 deref_is_break_var
);
3761 instructions
->push_tail(reset_fallthru_on_break
);
3763 /* Guard case statements depending on fallthru state. */
3764 ir_dereference_variable
*const deref_fallthru_guard
=
3765 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3766 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3768 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3769 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3771 instructions
->push_tail(test_fallthru
);
3773 /* Case statements do not have r-values. */
3779 ast_case_label_list::hir(exec_list
*instructions
,
3780 struct _mesa_glsl_parse_state
*state
)
3782 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3783 label
->hir(instructions
, state
);
3785 /* Case labels do not have r-values. */
3790 ast_case_label::hir(exec_list
*instructions
,
3791 struct _mesa_glsl_parse_state
*state
)
3795 ir_dereference_variable
*deref_fallthru_var
=
3796 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3798 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3800 /* If not default case, ... */
3801 if (this->test_value
!= NULL
) {
3802 /* Conditionally set fallthru state based on
3803 * comparison of cached test expression value to case label.
3805 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3806 ir_constant
*label_const
= label_rval
->constant_expression_value();
3809 YYLTYPE loc
= this->test_value
->get_location();
3811 _mesa_glsl_error(& loc
, state
,
3812 "switch statement case label must be a "
3813 "constant expression");
3815 /* Stuff a dummy value in to allow processing to continue. */
3816 label_const
= new(ctx
) ir_constant(0);
3818 ast_expression
*previous_label
= (ast_expression
*)
3819 hash_table_find(state
->switch_state
.labels_ht
,
3820 (void *)(uintptr_t)label_const
->value
.u
[0]);
3822 if (previous_label
) {
3823 YYLTYPE loc
= this->test_value
->get_location();
3824 _mesa_glsl_error(& loc
, state
,
3825 "duplicate case value");
3827 loc
= previous_label
->get_location();
3828 _mesa_glsl_error(& loc
, state
,
3829 "this is the previous case label");
3831 hash_table_insert(state
->switch_state
.labels_ht
,
3833 (void *)(uintptr_t)label_const
->value
.u
[0]);
3837 ir_dereference_variable
*deref_test_var
=
3838 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3840 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3844 ir_assignment
*set_fallthru_on_test
=
3845 new(ctx
) ir_assignment(deref_fallthru_var
,
3849 instructions
->push_tail(set_fallthru_on_test
);
3850 } else { /* default case */
3851 if (state
->switch_state
.previous_default
) {
3852 YYLTYPE loc
= this->get_location();
3853 _mesa_glsl_error(& loc
, state
,
3854 "multiple default labels in one switch");
3856 loc
= state
->switch_state
.previous_default
->get_location();
3857 _mesa_glsl_error(& loc
, state
,
3858 "this is the first default label");
3860 state
->switch_state
.previous_default
= this;
3862 /* Set falltrhu state. */
3863 ir_assignment
*set_fallthru
=
3864 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
3866 instructions
->push_tail(set_fallthru
);
3869 /* Case statements do not have r-values. */
3874 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3875 struct _mesa_glsl_parse_state
*state
)
3879 if (condition
!= NULL
) {
3880 ir_rvalue
*const cond
=
3881 condition
->hir(& stmt
->body_instructions
, state
);
3884 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3885 YYLTYPE loc
= condition
->get_location();
3887 _mesa_glsl_error(& loc
, state
,
3888 "loop condition must be scalar boolean");
3890 /* As the first code in the loop body, generate a block that looks
3891 * like 'if (!condition) break;' as the loop termination condition.
3893 ir_rvalue
*const not_cond
=
3894 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
3896 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3898 ir_jump
*const break_stmt
=
3899 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3901 if_stmt
->then_instructions
.push_tail(break_stmt
);
3902 stmt
->body_instructions
.push_tail(if_stmt
);
3909 ast_iteration_statement::hir(exec_list
*instructions
,
3910 struct _mesa_glsl_parse_state
*state
)
3914 /* For-loops and while-loops start a new scope, but do-while loops do not.
3916 if (mode
!= ast_do_while
)
3917 state
->symbols
->push_scope();
3919 if (init_statement
!= NULL
)
3920 init_statement
->hir(instructions
, state
);
3922 ir_loop
*const stmt
= new(ctx
) ir_loop();
3923 instructions
->push_tail(stmt
);
3925 /* Track the current loop nesting. */
3926 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3928 state
->loop_nesting_ast
= this;
3930 /* Likewise, indicate that following code is closest to a loop,
3931 * NOT closest to a switch.
3933 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3934 state
->switch_state
.is_switch_innermost
= false;
3936 if (mode
!= ast_do_while
)
3937 condition_to_hir(stmt
, state
);
3940 body
->hir(& stmt
->body_instructions
, state
);
3942 if (rest_expression
!= NULL
)
3943 rest_expression
->hir(& stmt
->body_instructions
, state
);
3945 if (mode
== ast_do_while
)
3946 condition_to_hir(stmt
, state
);
3948 if (mode
!= ast_do_while
)
3949 state
->symbols
->pop_scope();
3951 /* Restore previous nesting before returning. */
3952 state
->loop_nesting_ast
= nesting_ast
;
3953 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3955 /* Loops do not have r-values.
3962 ast_type_specifier::hir(exec_list
*instructions
,
3963 struct _mesa_glsl_parse_state
*state
)
3965 if (!this->is_precision_statement
&& this->structure
== NULL
)
3968 YYLTYPE loc
= this->get_location();
3970 if (this->precision
!= ast_precision_none
3971 && !state
->check_precision_qualifiers_allowed(&loc
)) {
3974 if (this->precision
!= ast_precision_none
3975 && this->structure
!= NULL
) {
3976 _mesa_glsl_error(&loc
, state
,
3977 "precision qualifiers do not apply to structures");
3981 /* If this is a precision statement, check that the type to which it is
3982 * applied is either float or int.
3984 * From section 4.5.3 of the GLSL 1.30 spec:
3985 * "The precision statement
3986 * precision precision-qualifier type;
3987 * can be used to establish a default precision qualifier. The type
3988 * field can be either int or float [...]. Any other types or
3989 * qualifiers will result in an error.
3991 if (this->is_precision_statement
) {
3992 assert(this->precision
!= ast_precision_none
);
3993 assert(this->structure
== NULL
); /* The check for structures was
3994 * performed above. */
3995 if (this->is_array
) {
3996 _mesa_glsl_error(&loc
, state
,
3997 "default precision statements do not apply to "
4001 if (strcmp(this->type_name
, "float") != 0 &&
4002 strcmp(this->type_name
, "int") != 0) {
4003 _mesa_glsl_error(&loc
, state
,
4004 "default precision statements apply only to types "
4009 /* FINISHME: Translate precision statements into IR. */
4013 if (this->structure
!= NULL
)
4014 return this->structure
->hir(instructions
, state
);
4021 * Process a structure or interface block tree into an array of structure fields
4023 * After parsing, where there are some syntax differnces, structures and
4024 * interface blocks are almost identical. They are similar enough that the
4025 * AST for each can be processed the same way into a set of
4026 * \c glsl_struct_field to describe the members.
4029 * The number of fields processed. A pointer to the array structure fields is
4030 * stored in \c *fields_ret.
4033 ast_process_structure_or_interface_block(exec_list
*instructions
,
4034 struct _mesa_glsl_parse_state
*state
,
4035 exec_list
*declarations
,
4037 glsl_struct_field
**fields_ret
,
4039 bool block_row_major
)
4041 unsigned decl_count
= 0;
4043 /* Make an initial pass over the list of fields to determine how
4044 * many there are. Each element in this list is an ast_declarator_list.
4045 * This means that we actually need to count the number of elements in the
4046 * 'declarations' list in each of the elements.
4048 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4049 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4054 /* Allocate storage for the fields and process the field
4055 * declarations. As the declarations are processed, try to also convert
4056 * the types to HIR. This ensures that structure definitions embedded in
4057 * other structure definitions or in interface blocks are processed.
4059 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4063 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4064 const char *type_name
;
4066 decl_list
->type
->specifier
->hir(instructions
, state
);
4068 /* Section 10.9 of the GLSL ES 1.00 specification states that
4069 * embedded structure definitions have been removed from the language.
4071 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4072 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
4073 "not allowed in GLSL ES 1.00.");
4076 const glsl_type
*decl_type
=
4077 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
4079 foreach_list_typed (ast_declaration
, decl
, link
,
4080 &decl_list
->declarations
) {
4081 /* From the GL_ARB_uniform_buffer_object spec:
4083 * "Sampler types are not allowed inside of uniform
4084 * blocks. All other types, arrays, and structures
4085 * allowed for uniforms are allowed within a uniform
4088 const struct glsl_type
*field_type
= decl_type
;
4090 if (is_interface
&& field_type
->contains_sampler()) {
4091 YYLTYPE loc
= decl_list
->get_location();
4092 _mesa_glsl_error(&loc
, state
,
4093 "Uniform in non-default uniform block contains sampler\n");
4096 const struct ast_type_qualifier
*const qual
=
4097 & decl_list
->type
->qualifier
;
4098 if (qual
->flags
.q
.std140
||
4099 qual
->flags
.q
.packed
||
4100 qual
->flags
.q
.shared
) {
4101 _mesa_glsl_error(&loc
, state
,
4102 "uniform block layout qualifiers std140, packed, and "
4103 "shared can only be applied to uniform blocks, not "
4107 if (decl
->is_array
) {
4108 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4111 fields
[i
].type
= (field_type
!= NULL
)
4112 ? field_type
: glsl_type::error_type
;
4113 fields
[i
].name
= decl
->identifier
;
4115 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4116 if (!field_type
->is_matrix() && !field_type
->is_record()) {
4117 _mesa_glsl_error(&loc
, state
,
4118 "uniform block layout qualifiers row_major and "
4119 "column_major can only be applied to matrix and "
4122 validate_matrix_layout_for_type(state
, &loc
, field_type
);
4125 if (field_type
->is_matrix() ||
4126 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4127 fields
[i
].row_major
= block_row_major
;
4128 if (qual
->flags
.q
.row_major
)
4129 fields
[i
].row_major
= true;
4130 else if (qual
->flags
.q
.column_major
)
4131 fields
[i
].row_major
= false;
4138 assert(i
== decl_count
);
4140 *fields_ret
= fields
;
4146 ast_struct_specifier::hir(exec_list
*instructions
,
4147 struct _mesa_glsl_parse_state
*state
)
4149 YYLTYPE loc
= this->get_location();
4150 glsl_struct_field
*fields
;
4151 unsigned decl_count
=
4152 ast_process_structure_or_interface_block(instructions
,
4154 &this->declarations
,
4160 const glsl_type
*t
=
4161 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4163 if (!state
->symbols
->add_type(name
, t
)) {
4164 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4166 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4168 state
->num_user_structures
+ 1);
4170 s
[state
->num_user_structures
] = t
;
4171 state
->user_structures
= s
;
4172 state
->num_user_structures
++;
4176 /* Structure type definitions do not have r-values.
4181 static struct gl_uniform_block
*
4182 get_next_uniform_block(struct _mesa_glsl_parse_state
*state
)
4184 if (state
->num_uniform_blocks
>= state
->uniform_block_array_size
) {
4185 state
->uniform_block_array_size
*= 2;
4186 if (state
->uniform_block_array_size
<= 4)
4187 state
->uniform_block_array_size
= 4;
4189 state
->uniform_blocks
= reralloc(state
,
4190 state
->uniform_blocks
,
4191 struct gl_uniform_block
,
4192 state
->uniform_block_array_size
);
4195 memset(&state
->uniform_blocks
[state
->num_uniform_blocks
],
4196 0, sizeof(*state
->uniform_blocks
));
4197 return &state
->uniform_blocks
[state
->num_uniform_blocks
++];
4201 ast_uniform_block::hir(exec_list
*instructions
,
4202 struct _mesa_glsl_parse_state
*state
)
4204 YYLTYPE loc
= this->get_location();
4206 /* The ast_uniform_block has a list of ast_declarator_lists. We
4207 * need to turn those into ir_variables with an association
4208 * with this uniform block.
4210 struct gl_uniform_block
*ubo
= get_next_uniform_block(state
);
4211 ubo
->Name
= ralloc_strdup(state
->uniform_blocks
, this->block_name
);
4213 if (!state
->symbols
->add_uniform_block(ubo
)) {
4214 YYLTYPE loc
= this->get_location();
4215 _mesa_glsl_error(&loc
, state
, "Uniform block name `%s' already taken in "
4216 "the current scope.\n", ubo
->Name
);
4219 if (this->layout
.flags
.q
.shared
) {
4220 ubo
->_Packing
= ubo_packing_shared
;
4221 } else if (this->layout
.flags
.q
.packed
) {
4222 ubo
->_Packing
= ubo_packing_packed
;
4224 /* The default layout is std140.
4226 ubo
->_Packing
= ubo_packing_std140
;
4229 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4230 exec_list declared_variables
;
4231 glsl_struct_field
*fields
;
4232 unsigned int num_variables
=
4233 ast_process_structure_or_interface_block(&declared_variables
,
4235 &this->declarations
,
4241 STATIC_ASSERT(unsigned(GLSL_INTERFACE_PACKING_STD140
)
4242 == unsigned(ubo_packing_std140
));
4243 STATIC_ASSERT(unsigned(GLSL_INTERFACE_PACKING_SHARED
)
4244 == unsigned(ubo_packing_shared
));
4245 STATIC_ASSERT(unsigned(GLSL_INTERFACE_PACKING_PACKED
)
4246 == unsigned(ubo_packing_packed
));
4248 const glsl_type
*block_type
=
4249 glsl_type::get_interface_instance(fields
,
4251 (enum glsl_interface_packing
) ubo
->_Packing
,
4254 /* Since interface blocks cannot contain statements, it should be
4255 * impossible for the block to generate any instructions.
4257 assert(declared_variables
.is_empty());
4259 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4262 * "If an instance name (instance-name) is used, then it puts all the
4263 * members inside a scope within its own name space, accessed with the
4264 * field selector ( . ) operator (analogously to structures)."
4266 if (this->instance_name
) {
4267 ir_variable
*var
= new(state
) ir_variable(block_type
,
4268 this->instance_name
,
4271 var
->interface_type
= block_type
;
4272 state
->symbols
->add_variable(var
);
4273 instructions
->push_tail(var
);
4275 for (unsigned i
= 0; i
< num_variables
; i
++) {
4277 new(state
) ir_variable(fields
[i
].type
,
4278 ralloc_strdup(state
, fields
[i
].name
),
4280 var
->uniform_block
= ubo
- state
->uniform_blocks
;
4281 var
->interface_type
= block_type
;
4283 state
->symbols
->add_variable(var
);
4284 instructions
->push_tail(var
);
4288 /* FINISHME: Eventually the rest of this code needs to be moved into the
4291 ubo
->Uniforms
= rzalloc_array(state
->uniform_blocks
,
4292 struct gl_uniform_buffer_variable
,
4295 for (unsigned i
= 0; i
< num_variables
; i
++) {
4296 struct gl_uniform_buffer_variable
*ubo_var
=
4297 &ubo
->Uniforms
[ubo
->NumUniforms
++];
4299 ubo_var
->Name
= ralloc_strdup(state
->uniform_blocks
, fields
[i
].name
);
4300 ubo_var
->Type
= fields
[i
].type
;
4301 ubo_var
->Offset
= 0; /* Assigned at link time. */
4302 ubo_var
->RowMajor
= fields
[i
].row_major
;
4309 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
4310 exec_list
*instructions
)
4312 bool gl_FragColor_assigned
= false;
4313 bool gl_FragData_assigned
= false;
4314 bool user_defined_fs_output_assigned
= false;
4315 ir_variable
*user_defined_fs_output
= NULL
;
4317 /* It would be nice to have proper location information. */
4319 memset(&loc
, 0, sizeof(loc
));
4321 foreach_list(node
, instructions
) {
4322 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4324 if (!var
|| !var
->assigned
)
4327 if (strcmp(var
->name
, "gl_FragColor") == 0)
4328 gl_FragColor_assigned
= true;
4329 else if (strcmp(var
->name
, "gl_FragData") == 0)
4330 gl_FragData_assigned
= true;
4331 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4332 if (state
->target
== fragment_shader
&&
4333 var
->mode
== ir_var_shader_out
) {
4334 user_defined_fs_output_assigned
= true;
4335 user_defined_fs_output
= var
;
4340 /* From the GLSL 1.30 spec:
4342 * "If a shader statically assigns a value to gl_FragColor, it
4343 * may not assign a value to any element of gl_FragData. If a
4344 * shader statically writes a value to any element of
4345 * gl_FragData, it may not assign a value to
4346 * gl_FragColor. That is, a shader may assign values to either
4347 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4348 * linked together must also consistently write just one of
4349 * these variables. Similarly, if user declared output
4350 * variables are in use (statically assigned to), then the
4351 * built-in variables gl_FragColor and gl_FragData may not be
4352 * assigned to. These incorrect usages all generate compile
4355 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
4356 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4357 "`gl_FragColor' and `gl_FragData'\n");
4358 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
4359 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4360 "`gl_FragColor' and `%s'\n",
4361 user_defined_fs_output
->name
);
4362 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
4363 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4364 "`gl_FragData' and `%s'\n",
4365 user_defined_fs_output
->name
);