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 /* I assume a comparison of a struct containing a sampler just
861 * ignores the sampler present in the type.
867 cmp
= new(mem_ctx
) ir_constant(true);
872 /* For logical operations, we want to ensure that the operands are
873 * scalar booleans. If it isn't, emit an error and return a constant
874 * boolean to avoid triggering cascading error messages.
877 get_scalar_boolean_operand(exec_list
*instructions
,
878 struct _mesa_glsl_parse_state
*state
,
879 ast_expression
*parent_expr
,
881 const char *operand_name
,
884 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
886 ir_rvalue
*val
= expr
->hir(instructions
, state
);
888 if (val
->type
->is_boolean() && val
->type
->is_scalar())
891 if (!*error_emitted
) {
892 YYLTYPE loc
= expr
->get_location();
893 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
895 parent_expr
->operator_string(parent_expr
->oper
));
896 *error_emitted
= true;
899 return new(ctx
) ir_constant(true);
903 * If name refers to a builtin array whose maximum allowed size is less than
904 * size, report an error and return true. Otherwise return false.
907 check_builtin_array_max_size(const char *name
, unsigned size
,
908 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
910 if ((strcmp("gl_TexCoord", name
) == 0)
911 && (size
> state
->Const
.MaxTextureCoords
)) {
912 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
914 * "The size [of gl_TexCoord] can be at most
915 * gl_MaxTextureCoords."
917 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
918 "be larger than gl_MaxTextureCoords (%u)\n",
919 state
->Const
.MaxTextureCoords
);
921 } else if (strcmp("gl_ClipDistance", name
) == 0
922 && size
> state
->Const
.MaxClipPlanes
) {
923 /* From section 7.1 (Vertex Shader Special Variables) of the
926 * "The gl_ClipDistance array is predeclared as unsized and
927 * must be sized by the shader either redeclaring it with a
928 * size or indexing it only with integral constant
929 * expressions. ... The size can be at most
930 * gl_MaxClipDistances."
932 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
933 "be larger than gl_MaxClipDistances (%u)\n",
934 state
->Const
.MaxClipPlanes
);
941 * Create the constant 1, of a which is appropriate for incrementing and
942 * decrementing values of the given GLSL type. For example, if type is vec4,
943 * this creates a constant value of 1.0 having type float.
945 * If the given type is invalid for increment and decrement operators, return
946 * a floating point 1--the error will be detected later.
949 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
951 switch (type
->base_type
) {
953 return new(ctx
) ir_constant((unsigned) 1);
955 return new(ctx
) ir_constant(1);
957 case GLSL_TYPE_FLOAT
:
958 return new(ctx
) ir_constant(1.0f
);
963 ast_expression::hir(exec_list
*instructions
,
964 struct _mesa_glsl_parse_state
*state
)
967 static const int operations
[AST_NUM_OPERATORS
] = {
968 -1, /* ast_assign doesn't convert to ir_expression. */
969 -1, /* ast_plus doesn't convert to ir_expression. */
993 /* Note: The following block of expression types actually convert
994 * to multiple IR instructions.
996 ir_binop_mul
, /* ast_mul_assign */
997 ir_binop_div
, /* ast_div_assign */
998 ir_binop_mod
, /* ast_mod_assign */
999 ir_binop_add
, /* ast_add_assign */
1000 ir_binop_sub
, /* ast_sub_assign */
1001 ir_binop_lshift
, /* ast_ls_assign */
1002 ir_binop_rshift
, /* ast_rs_assign */
1003 ir_binop_bit_and
, /* ast_and_assign */
1004 ir_binop_bit_xor
, /* ast_xor_assign */
1005 ir_binop_bit_or
, /* ast_or_assign */
1007 -1, /* ast_conditional doesn't convert to ir_expression. */
1008 ir_binop_add
, /* ast_pre_inc. */
1009 ir_binop_sub
, /* ast_pre_dec. */
1010 ir_binop_add
, /* ast_post_inc. */
1011 ir_binop_sub
, /* ast_post_dec. */
1012 -1, /* ast_field_selection doesn't conv to ir_expression. */
1013 -1, /* ast_array_index doesn't convert to ir_expression. */
1014 -1, /* ast_function_call doesn't conv to ir_expression. */
1015 -1, /* ast_identifier doesn't convert to ir_expression. */
1016 -1, /* ast_int_constant doesn't convert to ir_expression. */
1017 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1018 -1, /* ast_float_constant doesn't conv to ir_expression. */
1019 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1020 -1, /* ast_sequence doesn't convert to ir_expression. */
1022 ir_rvalue
*result
= NULL
;
1024 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1025 bool error_emitted
= false;
1028 loc
= this->get_location();
1030 switch (this->oper
) {
1032 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1033 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1035 result
= do_assignment(instructions
, state
,
1036 this->subexpressions
[0]->non_lvalue_description
,
1037 op
[0], op
[1], false,
1038 this->subexpressions
[0]->get_location());
1039 error_emitted
= result
->type
->is_error();
1044 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1046 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1048 error_emitted
= type
->is_error();
1054 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1056 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1058 error_emitted
= type
->is_error();
1060 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1068 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1069 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1071 type
= arithmetic_result_type(op
[0], op
[1],
1072 (this->oper
== ast_mul
),
1074 error_emitted
= type
->is_error();
1076 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1081 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1082 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1084 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1086 assert(operations
[this->oper
] == ir_binop_mod
);
1088 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1090 error_emitted
= type
->is_error();
1095 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1096 error_emitted
= true;
1099 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1100 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1101 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1103 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1105 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1112 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1113 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1115 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1117 /* The relational operators must either generate an error or result
1118 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1120 assert(type
->is_error()
1121 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1122 && type
->is_scalar()));
1124 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1126 error_emitted
= type
->is_error();
1131 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1132 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1134 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1136 * "The equality operators equal (==), and not equal (!=)
1137 * operate on all types. They result in a scalar Boolean. If
1138 * the operand types do not match, then there must be a
1139 * conversion from Section 4.1.10 "Implicit Conversions"
1140 * applied to one operand that can make them match, in which
1141 * case this conversion is done."
1143 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1144 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1145 || (op
[0]->type
!= op
[1]->type
)) {
1146 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1147 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1148 error_emitted
= true;
1149 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1150 !state
->check_version(120, 300, &loc
,
1151 "array comparisons forbidden")) {
1152 error_emitted
= true;
1155 if (error_emitted
) {
1156 result
= new(ctx
) ir_constant(false);
1158 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1159 assert(result
->type
== glsl_type::bool_type
);
1166 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1167 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1168 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1170 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1172 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1176 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1178 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1179 error_emitted
= true;
1182 if (!op
[0]->type
->is_integer()) {
1183 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1184 error_emitted
= true;
1187 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1188 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1191 case ast_logic_and
: {
1192 exec_list rhs_instructions
;
1193 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1194 "LHS", &error_emitted
);
1195 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1196 "RHS", &error_emitted
);
1198 if (rhs_instructions
.is_empty()) {
1199 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1200 type
= result
->type
;
1202 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1205 instructions
->push_tail(tmp
);
1207 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1208 instructions
->push_tail(stmt
);
1210 stmt
->then_instructions
.append_list(&rhs_instructions
);
1211 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1212 ir_assignment
*const then_assign
=
1213 new(ctx
) ir_assignment(then_deref
, op
[1]);
1214 stmt
->then_instructions
.push_tail(then_assign
);
1216 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1217 ir_assignment
*const else_assign
=
1218 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1219 stmt
->else_instructions
.push_tail(else_assign
);
1221 result
= new(ctx
) ir_dereference_variable(tmp
);
1227 case ast_logic_or
: {
1228 exec_list rhs_instructions
;
1229 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1230 "LHS", &error_emitted
);
1231 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1232 "RHS", &error_emitted
);
1234 if (rhs_instructions
.is_empty()) {
1235 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1236 type
= result
->type
;
1238 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1241 instructions
->push_tail(tmp
);
1243 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1244 instructions
->push_tail(stmt
);
1246 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1247 ir_assignment
*const then_assign
=
1248 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1249 stmt
->then_instructions
.push_tail(then_assign
);
1251 stmt
->else_instructions
.append_list(&rhs_instructions
);
1252 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1253 ir_assignment
*const else_assign
=
1254 new(ctx
) ir_assignment(else_deref
, op
[1]);
1255 stmt
->else_instructions
.push_tail(else_assign
);
1257 result
= new(ctx
) ir_dereference_variable(tmp
);
1264 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1266 * "The logical binary operators and (&&), or ( | | ), and
1267 * exclusive or (^^). They operate only on two Boolean
1268 * expressions and result in a Boolean expression."
1270 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1272 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1275 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1280 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1281 "operand", &error_emitted
);
1283 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1287 case ast_mul_assign
:
1288 case ast_div_assign
:
1289 case ast_add_assign
:
1290 case ast_sub_assign
: {
1291 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1292 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1294 type
= arithmetic_result_type(op
[0], op
[1],
1295 (this->oper
== ast_mul_assign
),
1298 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1301 result
= do_assignment(instructions
, state
,
1302 this->subexpressions
[0]->non_lvalue_description
,
1303 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1304 this->subexpressions
[0]->get_location());
1305 error_emitted
= (op
[0]->type
->is_error());
1307 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1308 * explicitly test for this because none of the binary expression
1309 * operators allow array operands either.
1315 case ast_mod_assign
: {
1316 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1317 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1319 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1321 assert(operations
[this->oper
] == ir_binop_mod
);
1323 ir_rvalue
*temp_rhs
;
1324 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1327 result
= do_assignment(instructions
, state
,
1328 this->subexpressions
[0]->non_lvalue_description
,
1329 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1330 this->subexpressions
[0]->get_location());
1331 error_emitted
= type
->is_error();
1336 case ast_rs_assign
: {
1337 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1338 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1339 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1341 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1342 type
, op
[0], op
[1]);
1343 result
= do_assignment(instructions
, state
,
1344 this->subexpressions
[0]->non_lvalue_description
,
1345 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1346 this->subexpressions
[0]->get_location());
1347 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1351 case ast_and_assign
:
1352 case ast_xor_assign
:
1353 case ast_or_assign
: {
1354 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1355 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1356 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1358 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1359 type
, op
[0], op
[1]);
1360 result
= do_assignment(instructions
, state
,
1361 this->subexpressions
[0]->non_lvalue_description
,
1362 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1363 this->subexpressions
[0]->get_location());
1364 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1368 case ast_conditional
: {
1369 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1371 * "The ternary selection operator (?:). It operates on three
1372 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1373 * first expression, which must result in a scalar Boolean."
1375 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1376 "condition", &error_emitted
);
1378 /* The :? operator is implemented by generating an anonymous temporary
1379 * followed by an if-statement. The last instruction in each branch of
1380 * the if-statement assigns a value to the anonymous temporary. This
1381 * temporary is the r-value of the expression.
1383 exec_list then_instructions
;
1384 exec_list else_instructions
;
1386 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1387 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1389 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1391 * "The second and third expressions can be any type, as
1392 * long their types match, or there is a conversion in
1393 * Section 4.1.10 "Implicit Conversions" that can be applied
1394 * to one of the expressions to make their types match. This
1395 * resulting matching type is the type of the entire
1398 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1399 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1400 || (op
[1]->type
!= op
[2]->type
)) {
1401 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1403 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1404 "operator must have matching types.");
1405 error_emitted
= true;
1406 type
= glsl_type::error_type
;
1411 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1413 * "The second and third expressions must be the same type, but can
1414 * be of any type other than an array."
1416 if (type
->is_array() &&
1417 !state
->check_version(120, 300, &loc
,
1418 "Second and third operands of ?: operator "
1419 "cannot be arrays")) {
1420 error_emitted
= true;
1423 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1424 ir_constant
*then_val
= op
[1]->constant_expression_value();
1425 ir_constant
*else_val
= op
[2]->constant_expression_value();
1427 if (then_instructions
.is_empty()
1428 && else_instructions
.is_empty()
1429 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1430 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1432 ir_variable
*const tmp
=
1433 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1434 instructions
->push_tail(tmp
);
1436 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1437 instructions
->push_tail(stmt
);
1439 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1440 ir_dereference
*const then_deref
=
1441 new(ctx
) ir_dereference_variable(tmp
);
1442 ir_assignment
*const then_assign
=
1443 new(ctx
) ir_assignment(then_deref
, op
[1]);
1444 stmt
->then_instructions
.push_tail(then_assign
);
1446 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1447 ir_dereference
*const else_deref
=
1448 new(ctx
) ir_dereference_variable(tmp
);
1449 ir_assignment
*const else_assign
=
1450 new(ctx
) ir_assignment(else_deref
, op
[2]);
1451 stmt
->else_instructions
.push_tail(else_assign
);
1453 result
= new(ctx
) ir_dereference_variable(tmp
);
1460 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1461 ? "pre-increment operation" : "pre-decrement operation";
1463 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1464 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1466 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1468 ir_rvalue
*temp_rhs
;
1469 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1472 result
= do_assignment(instructions
, state
,
1473 this->subexpressions
[0]->non_lvalue_description
,
1474 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1475 this->subexpressions
[0]->get_location());
1476 error_emitted
= op
[0]->type
->is_error();
1481 case ast_post_dec
: {
1482 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1483 ? "post-increment operation" : "post-decrement operation";
1484 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1485 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1487 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1489 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1491 ir_rvalue
*temp_rhs
;
1492 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1495 /* Get a temporary of a copy of the lvalue before it's modified.
1496 * This may get thrown away later.
1498 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1500 (void)do_assignment(instructions
, state
,
1501 this->subexpressions
[0]->non_lvalue_description
,
1502 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1503 this->subexpressions
[0]->get_location());
1505 error_emitted
= op
[0]->type
->is_error();
1509 case ast_field_selection
:
1510 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1513 case ast_array_index
: {
1514 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1516 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1517 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1519 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1521 ir_rvalue
*const array
= op
[0];
1523 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1525 /* Do not use op[0] after this point. Use array.
1533 if (!array
->type
->is_array()
1534 && !array
->type
->is_matrix()
1535 && !array
->type
->is_vector()) {
1536 _mesa_glsl_error(& index_loc
, state
,
1537 "cannot dereference non-array / non-matrix / "
1539 error_emitted
= true;
1542 if (!op
[1]->type
->is_integer()) {
1543 _mesa_glsl_error(& index_loc
, state
,
1544 "array index must be integer type");
1545 error_emitted
= true;
1546 } else if (!op
[1]->type
->is_scalar()) {
1547 _mesa_glsl_error(& index_loc
, state
,
1548 "array index must be scalar");
1549 error_emitted
= true;
1552 /* If the array index is a constant expression and the array has a
1553 * declared size, ensure that the access is in-bounds. If the array
1554 * index is not a constant expression, ensure that the array has a
1557 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1558 if (const_index
!= NULL
) {
1559 const int idx
= const_index
->value
.i
[0];
1560 const char *type_name
;
1563 if (array
->type
->is_matrix()) {
1564 type_name
= "matrix";
1565 } else if (array
->type
->is_vector()) {
1566 type_name
= "vector";
1568 type_name
= "array";
1571 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1573 * "It is illegal to declare an array with a size, and then
1574 * later (in the same shader) index the same array with an
1575 * integral constant expression greater than or equal to the
1576 * declared size. It is also illegal to index an array with a
1577 * negative constant expression."
1579 if (array
->type
->is_matrix()) {
1580 if (array
->type
->row_type()->vector_elements
<= idx
) {
1581 bound
= array
->type
->row_type()->vector_elements
;
1583 } else if (array
->type
->is_vector()) {
1584 if (array
->type
->vector_elements
<= idx
) {
1585 bound
= array
->type
->vector_elements
;
1588 if ((array
->type
->array_size() > 0)
1589 && (array
->type
->array_size() <= idx
)) {
1590 bound
= array
->type
->array_size();
1595 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1597 error_emitted
= true;
1598 } else if (idx
< 0) {
1599 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1601 error_emitted
= true;
1604 if (array
->type
->is_array()) {
1605 /* If the array is a variable dereference, it dereferences the
1606 * whole array, by definition. Use this to get the variable.
1608 * FINISHME: Should some methods for getting / setting / testing
1609 * FINISHME: array access limits be added to ir_dereference?
1611 ir_variable
*const v
= array
->whole_variable_referenced();
1612 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
)) {
1613 v
->max_array_access
= idx
;
1615 /* Check whether this access will, as a side effect, implicitly
1616 * cause the size of a built-in array to be too large.
1618 if (check_builtin_array_max_size(v
->name
, idx
+1, loc
, state
))
1619 error_emitted
= true;
1622 } else if (array
->type
->array_size() == 0) {
1623 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1625 if (array
->type
->is_array()) {
1626 /* whole_variable_referenced can return NULL if the array is a
1627 * member of a structure. In this case it is safe to not update
1628 * the max_array_access field because it is never used for fields
1631 ir_variable
*v
= array
->whole_variable_referenced();
1633 v
->max_array_access
= array
->type
->array_size() - 1;
1637 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1639 * "Samplers aggregated into arrays within a shader (using square
1640 * brackets [ ]) can only be indexed with integral constant
1641 * expressions [...]."
1643 * This restriction was added in GLSL 1.30. Shaders using earlier version
1644 * of the language should not be rejected by the compiler front-end for
1645 * using this construct. This allows useful things such as using a loop
1646 * counter as the index to an array of samplers. If the loop in unrolled,
1647 * the code should compile correctly. Instead, emit a warning.
1649 if (array
->type
->is_array() &&
1650 array
->type
->element_type()->is_sampler() &&
1651 const_index
== NULL
) {
1653 if (!state
->is_version(130, 100)) {
1654 if (state
->es_shader
) {
1655 _mesa_glsl_warning(&loc
, state
,
1656 "sampler arrays indexed with non-constant "
1657 "expressions is optional in %s",
1658 state
->get_version_string());
1660 _mesa_glsl_warning(&loc
, state
,
1661 "sampler arrays indexed with non-constant "
1662 "expressions will be forbidden in GLSL 1.30 and "
1666 _mesa_glsl_error(&loc
, state
,
1667 "sampler arrays indexed with non-constant "
1668 "expressions is forbidden in GLSL 1.30 and "
1670 error_emitted
= true;
1675 result
->type
= glsl_type::error_type
;
1680 case ast_function_call
:
1681 /* Should *NEVER* get here. ast_function_call should always be handled
1682 * by ast_function_expression::hir.
1687 case ast_identifier
: {
1688 /* ast_identifier can appear several places in a full abstract syntax
1689 * tree. This particular use must be at location specified in the grammar
1690 * as 'variable_identifier'.
1693 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1697 result
= new(ctx
) ir_dereference_variable(var
);
1699 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1700 this->primary_expression
.identifier
);
1702 result
= ir_rvalue::error_value(ctx
);
1703 error_emitted
= true;
1708 case ast_int_constant
:
1709 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1712 case ast_uint_constant
:
1713 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1716 case ast_float_constant
:
1717 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1720 case ast_bool_constant
:
1721 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1724 case ast_sequence
: {
1725 /* It should not be possible to generate a sequence in the AST without
1726 * any expressions in it.
1728 assert(!this->expressions
.is_empty());
1730 /* The r-value of a sequence is the last expression in the sequence. If
1731 * the other expressions in the sequence do not have side-effects (and
1732 * therefore add instructions to the instruction list), they get dropped
1735 exec_node
*previous_tail_pred
= NULL
;
1736 YYLTYPE previous_operand_loc
= loc
;
1738 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1739 /* If one of the operands of comma operator does not generate any
1740 * code, we want to emit a warning. At each pass through the loop
1741 * previous_tail_pred will point to the last instruction in the
1742 * stream *before* processing the previous operand. Naturally,
1743 * instructions->tail_pred will point to the last instruction in the
1744 * stream *after* processing the previous operand. If the two
1745 * pointers match, then the previous operand had no effect.
1747 * The warning behavior here differs slightly from GCC. GCC will
1748 * only emit a warning if none of the left-hand operands have an
1749 * effect. However, it will emit a warning for each. I believe that
1750 * there are some cases in C (especially with GCC extensions) where
1751 * it is useful to have an intermediate step in a sequence have no
1752 * effect, but I don't think these cases exist in GLSL. Either way,
1753 * it would be a giant hassle to replicate that behavior.
1755 if (previous_tail_pred
== instructions
->tail_pred
) {
1756 _mesa_glsl_warning(&previous_operand_loc
, state
,
1757 "left-hand operand of comma expression has "
1761 /* tail_pred is directly accessed instead of using the get_tail()
1762 * method for performance reasons. get_tail() has extra code to
1763 * return NULL when the list is empty. We don't care about that
1764 * here, so using tail_pred directly is fine.
1766 previous_tail_pred
= instructions
->tail_pred
;
1767 previous_operand_loc
= ast
->get_location();
1769 result
= ast
->hir(instructions
, state
);
1772 /* Any errors should have already been emitted in the loop above.
1774 error_emitted
= true;
1778 type
= NULL
; /* use result->type, not type. */
1779 assert(result
!= NULL
);
1781 if (result
->type
->is_error() && !error_emitted
)
1782 _mesa_glsl_error(& loc
, state
, "type mismatch");
1789 ast_expression_statement::hir(exec_list
*instructions
,
1790 struct _mesa_glsl_parse_state
*state
)
1792 /* It is possible to have expression statements that don't have an
1793 * expression. This is the solitary semicolon:
1795 * for (i = 0; i < 5; i++)
1798 * In this case the expression will be NULL. Test for NULL and don't do
1799 * anything in that case.
1801 if (expression
!= NULL
)
1802 expression
->hir(instructions
, state
);
1804 /* Statements do not have r-values.
1811 ast_compound_statement::hir(exec_list
*instructions
,
1812 struct _mesa_glsl_parse_state
*state
)
1815 state
->symbols
->push_scope();
1817 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1818 ast
->hir(instructions
, state
);
1821 state
->symbols
->pop_scope();
1823 /* Compound statements do not have r-values.
1829 static const glsl_type
*
1830 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1831 struct _mesa_glsl_parse_state
*state
)
1833 unsigned length
= 0;
1835 /* From page 19 (page 25) of the GLSL 1.20 spec:
1837 * "Only one-dimensional arrays may be declared."
1839 if (base
->is_array()) {
1840 _mesa_glsl_error(loc
, state
,
1841 "invalid array of `%s' (only one-dimensional arrays "
1844 return glsl_type::error_type
;
1847 if (array_size
!= NULL
) {
1848 exec_list dummy_instructions
;
1849 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1850 YYLTYPE loc
= array_size
->get_location();
1853 if (!ir
->type
->is_integer()) {
1854 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1855 } else if (!ir
->type
->is_scalar()) {
1856 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1858 ir_constant
*const size
= ir
->constant_expression_value();
1861 _mesa_glsl_error(& loc
, state
, "array size must be a "
1862 "constant valued expression");
1863 } else if (size
->value
.i
[0] <= 0) {
1864 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1866 assert(size
->type
== ir
->type
);
1867 length
= size
->value
.u
[0];
1869 /* If the array size is const (and we've verified that
1870 * it is) then no instructions should have been emitted
1871 * when we converted it to HIR. If they were emitted,
1872 * then either the array size isn't const after all, or
1873 * we are emitting unnecessary instructions.
1875 assert(dummy_instructions
.is_empty());
1879 } else if (state
->es_shader
) {
1880 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1881 * array declarations have been removed from the language.
1883 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1884 "allowed in GLSL ES 1.00.");
1887 return glsl_type::get_array_instance(base
, length
);
1892 ast_type_specifier::glsl_type(const char **name
,
1893 struct _mesa_glsl_parse_state
*state
) const
1895 const struct glsl_type
*type
;
1897 type
= state
->symbols
->get_type(this->type_name
);
1898 *name
= this->type_name
;
1900 if (this->is_array
) {
1901 YYLTYPE loc
= this->get_location();
1902 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1910 * Determine whether a toplevel variable declaration declares a varying. This
1911 * function operates by examining the variable's mode and the shader target,
1912 * so it correctly identifies linkage variables regardless of whether they are
1913 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1915 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1916 * this function will produce undefined results.
1919 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1923 return var
->mode
== ir_var_shader_out
;
1924 case fragment_shader
:
1925 return var
->mode
== ir_var_shader_in
;
1927 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1933 * Matrix layout qualifiers are only allowed on certain types
1936 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1938 const glsl_type
*type
)
1940 if (!type
->is_matrix() && !type
->is_record()) {
1941 _mesa_glsl_error(loc
, state
,
1942 "uniform block layout qualifiers row_major and "
1943 "column_major can only be applied to matrix and "
1945 } else if (type
->is_record()) {
1946 /* We allow 'layout(row_major)' on structure types because it's the only
1947 * way to get row-major layouts on matrices contained in structures.
1949 _mesa_glsl_warning(loc
, state
,
1950 "uniform block layout qualifiers row_major and "
1951 "column_major applied to structure types is not "
1952 "strictly conformant and my be rejected by other "
1958 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1960 struct _mesa_glsl_parse_state
*state
,
1962 bool ubo_qualifiers_valid
,
1965 if (qual
->flags
.q
.invariant
) {
1967 _mesa_glsl_error(loc
, state
,
1968 "variable `%s' may not be redeclared "
1969 "`invariant' after being used",
1976 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1977 || qual
->flags
.q
.uniform
1978 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1981 if (qual
->flags
.q
.centroid
)
1984 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1985 var
->type
= glsl_type::error_type
;
1986 _mesa_glsl_error(loc
, state
,
1987 "`attribute' variables may not be declared in the "
1989 _mesa_glsl_shader_target_name(state
->target
));
1992 /* If there is no qualifier that changes the mode of the variable, leave
1993 * the setting alone.
1995 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1996 var
->mode
= ir_var_function_inout
;
1997 else if (qual
->flags
.q
.in
)
1998 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
1999 else if (qual
->flags
.q
.attribute
2000 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
2001 var
->mode
= ir_var_shader_in
;
2002 else if (qual
->flags
.q
.out
)
2003 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2004 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
2005 var
->mode
= ir_var_shader_out
;
2006 else if (qual
->flags
.q
.uniform
)
2007 var
->mode
= ir_var_uniform
;
2009 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
2010 /* This variable is being used to link data between shader stages (in
2011 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2012 * that is allowed for such purposes.
2014 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2016 * "The varying qualifier can be used only with the data types
2017 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2020 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2021 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2023 * "Fragment inputs can only be signed and unsigned integers and
2024 * integer vectors, float, floating-point vectors, matrices, or
2025 * arrays of these. Structures cannot be input.
2027 * Similar text exists in the section on vertex shader outputs.
2029 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2030 * 3.00 spec allows structs as well. Varying structs are also allowed
2033 switch (var
->type
->get_scalar_type()->base_type
) {
2034 case GLSL_TYPE_FLOAT
:
2035 /* Ok in all GLSL versions */
2037 case GLSL_TYPE_UINT
:
2039 if (state
->is_version(130, 300))
2041 _mesa_glsl_error(loc
, state
,
2042 "varying variables must be of base type float in %s",
2043 state
->get_version_string());
2045 case GLSL_TYPE_STRUCT
:
2046 if (state
->is_version(150, 300))
2048 _mesa_glsl_error(loc
, state
,
2049 "varying variables may not be of type struct");
2052 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2057 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2058 switch (state
->target
) {
2060 if (var
->mode
== ir_var_shader_out
)
2061 var
->invariant
= true;
2063 case geometry_shader
:
2064 if ((var
->mode
== ir_var_shader_in
)
2065 || (var
->mode
== ir_var_shader_out
))
2066 var
->invariant
= true;
2068 case fragment_shader
:
2069 if (var
->mode
== ir_var_shader_in
)
2070 var
->invariant
= true;
2075 if (qual
->flags
.q
.flat
)
2076 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2077 else if (qual
->flags
.q
.noperspective
)
2078 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2079 else if (qual
->flags
.q
.smooth
)
2080 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2082 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2084 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
2085 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
) &&
2086 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)) {
2087 _mesa_glsl_error(loc
, state
,
2088 "interpolation qualifier `%s' can only be applied to "
2089 "vertex shader outputs and fragment shader inputs.",
2090 var
->interpolation_string());
2093 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2094 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2095 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2096 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2097 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2098 ? "origin_upper_left" : "pixel_center_integer";
2100 _mesa_glsl_error(loc
, state
,
2101 "layout qualifier `%s' can only be applied to "
2102 "fragment shader input `gl_FragCoord'",
2106 if (qual
->flags
.q
.explicit_location
) {
2107 const bool global_scope
= (state
->current_function
== NULL
);
2109 const char *string
= "";
2111 /* In the vertex shader only shader inputs can be given explicit
2114 * In the fragment shader only shader outputs can be given explicit
2117 switch (state
->target
) {
2119 if (!global_scope
|| (var
->mode
!= ir_var_shader_in
)) {
2125 case geometry_shader
:
2126 _mesa_glsl_error(loc
, state
,
2127 "geometry shader variables cannot be given "
2128 "explicit locations\n");
2131 case fragment_shader
:
2132 if (!global_scope
|| (var
->mode
!= ir_var_shader_out
)) {
2140 _mesa_glsl_error(loc
, state
,
2141 "only %s shader %s variables can be given an "
2142 "explicit location\n",
2143 _mesa_glsl_shader_target_name(state
->target
),
2146 var
->explicit_location
= true;
2148 /* This bit of silliness is needed because invalid explicit locations
2149 * are supposed to be flagged during linking. Small negative values
2150 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2151 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2152 * The linker needs to be able to differentiate these cases. This
2153 * ensures that negative values stay negative.
2155 if (qual
->location
>= 0) {
2156 var
->location
= (state
->target
== vertex_shader
)
2157 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2158 : (qual
->location
+ FRAG_RESULT_DATA0
);
2160 var
->location
= qual
->location
;
2163 if (qual
->flags
.q
.explicit_index
) {
2164 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2165 * Layout Qualifiers):
2167 * "It is also a compile-time error if a fragment shader
2168 * sets a layout index to less than 0 or greater than 1."
2170 * Older specifications don't mandate a behavior; we take
2171 * this as a clarification and always generate the error.
2173 if (qual
->index
< 0 || qual
->index
> 1) {
2174 _mesa_glsl_error(loc
, state
,
2175 "explicit index may only be 0 or 1\n");
2177 var
->explicit_index
= true;
2178 var
->index
= qual
->index
;
2182 } else if (qual
->flags
.q
.explicit_index
) {
2183 _mesa_glsl_error(loc
, state
,
2184 "explicit index requires explicit location\n");
2187 /* Does the declaration use the 'layout' keyword?
2189 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2190 || qual
->flags
.q
.origin_upper_left
2191 || qual
->flags
.q
.explicit_location
; /* no need for index since it relies on location */
2193 /* Does the declaration use the deprecated 'attribute' or 'varying'
2196 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2197 || qual
->flags
.q
.varying
;
2199 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2200 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2201 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2202 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2203 * These extensions and all following extensions that add the 'layout'
2204 * keyword have been modified to require the use of 'in' or 'out'.
2206 * The following extension do not allow the deprecated keywords:
2208 * GL_AMD_conservative_depth
2209 * GL_ARB_conservative_depth
2210 * GL_ARB_gpu_shader5
2211 * GL_ARB_separate_shader_objects
2212 * GL_ARB_tesselation_shader
2213 * GL_ARB_transform_feedback3
2214 * GL_ARB_uniform_buffer_object
2216 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2217 * allow layout with the deprecated keywords.
2219 const bool relaxed_layout_qualifier_checking
=
2220 state
->ARB_fragment_coord_conventions_enable
;
2222 if (uses_layout
&& uses_deprecated_qualifier
) {
2223 if (relaxed_layout_qualifier_checking
) {
2224 _mesa_glsl_warning(loc
, state
,
2225 "`layout' qualifier may not be used with "
2226 "`attribute' or `varying'");
2228 _mesa_glsl_error(loc
, state
,
2229 "`layout' qualifier may not be used with "
2230 "`attribute' or `varying'");
2234 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2235 * AMD_conservative_depth.
2237 int depth_layout_count
= qual
->flags
.q
.depth_any
2238 + qual
->flags
.q
.depth_greater
2239 + qual
->flags
.q
.depth_less
2240 + qual
->flags
.q
.depth_unchanged
;
2241 if (depth_layout_count
> 0
2242 && !state
->AMD_conservative_depth_enable
2243 && !state
->ARB_conservative_depth_enable
) {
2244 _mesa_glsl_error(loc
, state
,
2245 "extension GL_AMD_conservative_depth or "
2246 "GL_ARB_conservative_depth must be enabled "
2247 "to use depth layout qualifiers");
2248 } else if (depth_layout_count
> 0
2249 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2250 _mesa_glsl_error(loc
, state
,
2251 "depth layout qualifiers can be applied only to "
2253 } else if (depth_layout_count
> 1
2254 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2255 _mesa_glsl_error(loc
, state
,
2256 "at most one depth layout qualifier can be applied to "
2259 if (qual
->flags
.q
.depth_any
)
2260 var
->depth_layout
= ir_depth_layout_any
;
2261 else if (qual
->flags
.q
.depth_greater
)
2262 var
->depth_layout
= ir_depth_layout_greater
;
2263 else if (qual
->flags
.q
.depth_less
)
2264 var
->depth_layout
= ir_depth_layout_less
;
2265 else if (qual
->flags
.q
.depth_unchanged
)
2266 var
->depth_layout
= ir_depth_layout_unchanged
;
2268 var
->depth_layout
= ir_depth_layout_none
;
2270 if (qual
->flags
.q
.std140
||
2271 qual
->flags
.q
.packed
||
2272 qual
->flags
.q
.shared
) {
2273 _mesa_glsl_error(loc
, state
,
2274 "uniform block layout qualifiers std140, packed, and "
2275 "shared can only be applied to uniform blocks, not "
2279 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2280 if (!ubo_qualifiers_valid
) {
2281 _mesa_glsl_error(loc
, state
,
2282 "uniform block layout qualifiers row_major and "
2283 "column_major can only be applied to uniform block "
2286 validate_matrix_layout_for_type(state
, loc
, var
->type
);
2291 * Get the variable that is being redeclared by this declaration
2293 * Semantic checks to verify the validity of the redeclaration are also
2294 * performed. If semantic checks fail, compilation error will be emitted via
2295 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2298 * A pointer to an existing variable in the current scope if the declaration
2299 * is a redeclaration, \c NULL otherwise.
2302 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2303 struct _mesa_glsl_parse_state
*state
)
2305 /* Check if this declaration is actually a re-declaration, either to
2306 * resize an array or add qualifiers to an existing variable.
2308 * This is allowed for variables in the current scope, or when at
2309 * global scope (for built-ins in the implicit outer scope).
2311 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2312 if (earlier
== NULL
||
2313 (state
->current_function
!= NULL
&&
2314 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2319 YYLTYPE loc
= decl
->get_location();
2321 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2323 * "It is legal to declare an array without a size and then
2324 * later re-declare the same name as an array of the same
2325 * type and specify a size."
2327 if ((earlier
->type
->array_size() == 0)
2328 && var
->type
->is_array()
2329 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2330 /* FINISHME: This doesn't match the qualifiers on the two
2331 * FINISHME: declarations. It's not 100% clear whether this is
2332 * FINISHME: required or not.
2335 const unsigned size
= unsigned(var
->type
->array_size());
2336 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2337 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2338 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2340 earlier
->max_array_access
);
2343 earlier
->type
= var
->type
;
2346 } else if (state
->ARB_fragment_coord_conventions_enable
2347 && strcmp(var
->name
, "gl_FragCoord") == 0
2348 && earlier
->type
== var
->type
2349 && earlier
->mode
== var
->mode
) {
2350 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2353 earlier
->origin_upper_left
= var
->origin_upper_left
;
2354 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2356 /* According to section 4.3.7 of the GLSL 1.30 spec,
2357 * the following built-in varaibles can be redeclared with an
2358 * interpolation qualifier:
2361 * * gl_FrontSecondaryColor
2362 * * gl_BackSecondaryColor
2364 * * gl_SecondaryColor
2366 } else if (state
->is_version(130, 0)
2367 && (strcmp(var
->name
, "gl_FrontColor") == 0
2368 || strcmp(var
->name
, "gl_BackColor") == 0
2369 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2370 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2371 || strcmp(var
->name
, "gl_Color") == 0
2372 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2373 && earlier
->type
== var
->type
2374 && earlier
->mode
== var
->mode
) {
2375 earlier
->interpolation
= var
->interpolation
;
2377 /* Layout qualifiers for gl_FragDepth. */
2378 } else if ((state
->AMD_conservative_depth_enable
||
2379 state
->ARB_conservative_depth_enable
)
2380 && strcmp(var
->name
, "gl_FragDepth") == 0
2381 && earlier
->type
== var
->type
2382 && earlier
->mode
== var
->mode
) {
2384 /** From the AMD_conservative_depth spec:
2385 * Within any shader, the first redeclarations of gl_FragDepth
2386 * must appear before any use of gl_FragDepth.
2388 if (earlier
->used
) {
2389 _mesa_glsl_error(&loc
, state
,
2390 "the first redeclaration of gl_FragDepth "
2391 "must appear before any use of gl_FragDepth");
2394 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2395 if (earlier
->depth_layout
!= ir_depth_layout_none
2396 && earlier
->depth_layout
!= var
->depth_layout
) {
2397 _mesa_glsl_error(&loc
, state
,
2398 "gl_FragDepth: depth layout is declared here "
2399 "as '%s, but it was previously declared as "
2401 depth_layout_string(var
->depth_layout
),
2402 depth_layout_string(earlier
->depth_layout
));
2405 earlier
->depth_layout
= var
->depth_layout
;
2408 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2415 * Generate the IR for an initializer in a variable declaration
2418 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2419 ast_fully_specified_type
*type
,
2420 exec_list
*initializer_instructions
,
2421 struct _mesa_glsl_parse_state
*state
)
2423 ir_rvalue
*result
= NULL
;
2425 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2427 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2429 * "All uniform variables are read-only and are initialized either
2430 * directly by an application via API commands, or indirectly by
2433 if (var
->mode
== ir_var_uniform
) {
2434 state
->check_version(120, 0, &initializer_loc
,
2435 "cannot initialize uniforms");
2438 if (var
->type
->is_sampler()) {
2439 _mesa_glsl_error(& initializer_loc
, state
,
2440 "cannot initialize samplers");
2443 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2444 _mesa_glsl_error(& initializer_loc
, state
,
2445 "cannot initialize %s shader input / %s",
2446 _mesa_glsl_shader_target_name(state
->target
),
2447 (state
->target
== vertex_shader
)
2448 ? "attribute" : "varying");
2451 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2452 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2455 /* Calculate the constant value if this is a const or uniform
2458 if (type
->qualifier
.flags
.q
.constant
2459 || type
->qualifier
.flags
.q
.uniform
) {
2460 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2461 if (new_rhs
!= NULL
) {
2464 ir_constant
*constant_value
= rhs
->constant_expression_value();
2465 if (!constant_value
) {
2466 _mesa_glsl_error(& initializer_loc
, state
,
2467 "initializer of %s variable `%s' must be a "
2468 "constant expression",
2469 (type
->qualifier
.flags
.q
.constant
)
2470 ? "const" : "uniform",
2472 if (var
->type
->is_numeric()) {
2473 /* Reduce cascading errors. */
2474 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2477 rhs
= constant_value
;
2478 var
->constant_value
= constant_value
;
2481 _mesa_glsl_error(&initializer_loc
, state
,
2482 "initializer of type %s cannot be assigned to "
2483 "variable of type %s",
2484 rhs
->type
->name
, var
->type
->name
);
2485 if (var
->type
->is_numeric()) {
2486 /* Reduce cascading errors. */
2487 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2492 if (rhs
&& !rhs
->type
->is_error()) {
2493 bool temp
= var
->read_only
;
2494 if (type
->qualifier
.flags
.q
.constant
)
2495 var
->read_only
= false;
2497 /* Never emit code to initialize a uniform.
2499 const glsl_type
*initializer_type
;
2500 if (!type
->qualifier
.flags
.q
.uniform
) {
2501 result
= do_assignment(initializer_instructions
, state
,
2504 type
->get_location());
2505 initializer_type
= result
->type
;
2507 initializer_type
= rhs
->type
;
2509 var
->constant_initializer
= rhs
->constant_expression_value();
2510 var
->has_initializer
= true;
2512 /* If the declared variable is an unsized array, it must inherrit
2513 * its full type from the initializer. A declaration such as
2515 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2519 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2521 * The assignment generated in the if-statement (below) will also
2522 * automatically handle this case for non-uniforms.
2524 * If the declared variable is not an array, the types must
2525 * already match exactly. As a result, the type assignment
2526 * here can be done unconditionally. For non-uniforms the call
2527 * to do_assignment can change the type of the initializer (via
2528 * the implicit conversion rules). For uniforms the initializer
2529 * must be a constant expression, and the type of that expression
2530 * was validated above.
2532 var
->type
= initializer_type
;
2534 var
->read_only
= temp
;
2541 ast_declarator_list::hir(exec_list
*instructions
,
2542 struct _mesa_glsl_parse_state
*state
)
2545 const struct glsl_type
*decl_type
;
2546 const char *type_name
= NULL
;
2547 ir_rvalue
*result
= NULL
;
2548 YYLTYPE loc
= this->get_location();
2550 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2552 * "To ensure that a particular output variable is invariant, it is
2553 * necessary to use the invariant qualifier. It can either be used to
2554 * qualify a previously declared variable as being invariant
2556 * invariant gl_Position; // make existing gl_Position be invariant"
2558 * In these cases the parser will set the 'invariant' flag in the declarator
2559 * list, and the type will be NULL.
2561 if (this->invariant
) {
2562 assert(this->type
== NULL
);
2564 if (state
->current_function
!= NULL
) {
2565 _mesa_glsl_error(& loc
, state
,
2566 "All uses of `invariant' keyword must be at global "
2570 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2571 assert(!decl
->is_array
);
2572 assert(decl
->array_size
== NULL
);
2573 assert(decl
->initializer
== NULL
);
2575 ir_variable
*const earlier
=
2576 state
->symbols
->get_variable(decl
->identifier
);
2577 if (earlier
== NULL
) {
2578 _mesa_glsl_error(& loc
, state
,
2579 "Undeclared variable `%s' cannot be marked "
2580 "invariant\n", decl
->identifier
);
2581 } else if ((state
->target
== vertex_shader
)
2582 && (earlier
->mode
!= ir_var_shader_out
)) {
2583 _mesa_glsl_error(& loc
, state
,
2584 "`%s' cannot be marked invariant, vertex shader "
2585 "outputs only\n", decl
->identifier
);
2586 } else if ((state
->target
== fragment_shader
)
2587 && (earlier
->mode
!= ir_var_shader_in
)) {
2588 _mesa_glsl_error(& loc
, state
,
2589 "`%s' cannot be marked invariant, fragment shader "
2590 "inputs only\n", decl
->identifier
);
2591 } else if (earlier
->used
) {
2592 _mesa_glsl_error(& loc
, state
,
2593 "variable `%s' may not be redeclared "
2594 "`invariant' after being used",
2597 earlier
->invariant
= true;
2601 /* Invariant redeclarations do not have r-values.
2606 assert(this->type
!= NULL
);
2607 assert(!this->invariant
);
2609 /* The type specifier may contain a structure definition. Process that
2610 * before any of the variable declarations.
2612 (void) this->type
->specifier
->hir(instructions
, state
);
2614 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2615 if (this->declarations
.is_empty()) {
2616 /* If there is no structure involved in the program text, there are two
2617 * possible scenarios:
2619 * - The program text contained something like 'vec4;'. This is an
2620 * empty declaration. It is valid but weird. Emit a warning.
2622 * - The program text contained something like 'S;' and 'S' is not the
2623 * name of a known structure type. This is both invalid and weird.
2626 * Note that if decl_type is NULL and there is a structure involved,
2627 * there must have been some sort of error with the structure. In this
2628 * case we assume that an error was already generated on this line of
2629 * code for the structure. There is no need to generate an additional,
2632 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2634 if (this->type
->specifier
->structure
== NULL
) {
2635 if (decl_type
!= NULL
) {
2636 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2638 _mesa_glsl_error(&loc
, state
,
2639 "invalid type `%s' in empty declaration",
2645 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2646 const struct glsl_type
*var_type
;
2649 /* FINISHME: Emit a warning if a variable declaration shadows a
2650 * FINISHME: declaration at a higher scope.
2653 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2654 if (type_name
!= NULL
) {
2655 _mesa_glsl_error(& loc
, state
,
2656 "invalid type `%s' in declaration of `%s'",
2657 type_name
, decl
->identifier
);
2659 _mesa_glsl_error(& loc
, state
,
2660 "invalid type in declaration of `%s'",
2666 if (decl
->is_array
) {
2667 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2669 if (var_type
->is_error())
2672 var_type
= decl_type
;
2675 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2677 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2679 * "Global variables can only use the qualifiers const,
2680 * attribute, uni form, or varying. Only one may be
2683 * Local variables can only use the qualifier const."
2685 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2686 * any extension that adds the 'layout' keyword.
2688 if (!state
->is_version(130, 300)
2689 && !state
->ARB_explicit_attrib_location_enable
2690 && !state
->ARB_fragment_coord_conventions_enable
) {
2691 if (this->type
->qualifier
.flags
.q
.out
) {
2692 _mesa_glsl_error(& loc
, state
,
2693 "`out' qualifier in declaration of `%s' "
2694 "only valid for function parameters in %s.",
2695 decl
->identifier
, state
->get_version_string());
2697 if (this->type
->qualifier
.flags
.q
.in
) {
2698 _mesa_glsl_error(& loc
, state
,
2699 "`in' qualifier in declaration of `%s' "
2700 "only valid for function parameters in %s.",
2701 decl
->identifier
, state
->get_version_string());
2703 /* FINISHME: Test for other invalid qualifiers. */
2706 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2707 & loc
, this->ubo_qualifiers_valid
, false);
2709 if (this->type
->qualifier
.flags
.q
.invariant
) {
2710 if ((state
->target
== vertex_shader
) &&
2711 var
->mode
!= ir_var_shader_out
) {
2712 _mesa_glsl_error(& loc
, state
,
2713 "`%s' cannot be marked invariant, vertex shader "
2714 "outputs only\n", var
->name
);
2715 } else if ((state
->target
== fragment_shader
) &&
2716 var
->mode
!= ir_var_shader_in
) {
2717 /* FINISHME: Note that this doesn't work for invariant on
2718 * a function signature inval
2720 _mesa_glsl_error(& loc
, state
,
2721 "`%s' cannot be marked invariant, fragment shader "
2722 "inputs only\n", var
->name
);
2726 if (state
->current_function
!= NULL
) {
2727 const char *mode
= NULL
;
2728 const char *extra
= "";
2730 /* There is no need to check for 'inout' here because the parser will
2731 * only allow that in function parameter lists.
2733 if (this->type
->qualifier
.flags
.q
.attribute
) {
2735 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2737 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2739 } else if (this->type
->qualifier
.flags
.q
.in
) {
2741 extra
= " or in function parameter list";
2742 } else if (this->type
->qualifier
.flags
.q
.out
) {
2744 extra
= " or in function parameter list";
2748 _mesa_glsl_error(& loc
, state
,
2749 "%s variable `%s' must be declared at "
2751 mode
, var
->name
, extra
);
2753 } else if (var
->mode
== ir_var_shader_in
) {
2754 var
->read_only
= true;
2756 if (state
->target
== vertex_shader
) {
2757 bool error_emitted
= false;
2759 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2761 * "Vertex shader inputs can only be float, floating-point
2762 * vectors, matrices, signed and unsigned integers and integer
2763 * vectors. Vertex shader inputs can also form arrays of these
2764 * types, but not structures."
2766 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2768 * "Vertex shader inputs can only be float, floating-point
2769 * vectors, matrices, signed and unsigned integers and integer
2770 * vectors. They cannot be arrays or structures."
2772 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2774 * "The attribute qualifier can be used only with float,
2775 * floating-point vectors, and matrices. Attribute variables
2776 * cannot be declared as arrays or structures."
2778 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
2780 * "Vertex shader inputs can only be float, floating-point
2781 * vectors, matrices, signed and unsigned integers and integer
2782 * vectors. Vertex shader inputs cannot be arrays or
2785 const glsl_type
*check_type
= var
->type
->is_array()
2786 ? var
->type
->fields
.array
: var
->type
;
2788 switch (check_type
->base_type
) {
2789 case GLSL_TYPE_FLOAT
:
2791 case GLSL_TYPE_UINT
:
2793 if (state
->is_version(120, 300))
2797 _mesa_glsl_error(& loc
, state
,
2798 "vertex shader input / attribute cannot have "
2800 var
->type
->is_array() ? "array of " : "",
2802 error_emitted
= true;
2805 if (!error_emitted
&& var
->type
->is_array() &&
2806 !state
->check_version(140, 0, &loc
,
2807 "vertex shader input / attribute "
2808 "cannot have array type")) {
2809 error_emitted
= true;
2814 /* Integer vertex outputs must be qualified with 'flat'.
2816 * From section 4.3.6 of the GLSL 1.30 spec:
2817 * "If a vertex output is a signed or unsigned integer or integer
2818 * vector, then it must be qualified with the interpolation qualifier
2821 * From section 4.3.4 of the GLSL 3.00 ES spec:
2822 * "Fragment shader inputs that are signed or unsigned integers or
2823 * integer vectors must be qualified with the interpolation qualifier
2826 * Since vertex outputs and fragment inputs must have matching
2827 * qualifiers, these two requirements are equivalent.
2829 if (state
->is_version(130, 300)
2830 && state
->target
== vertex_shader
2831 && state
->current_function
== NULL
2832 && var
->type
->is_integer()
2833 && var
->mode
== ir_var_shader_out
2834 && var
->interpolation
!= INTERP_QUALIFIER_FLAT
) {
2836 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2837 "then it must be qualified with 'flat'");
2841 /* Interpolation qualifiers cannot be applied to 'centroid' and
2842 * 'centroid varying'.
2844 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2845 * "interpolation qualifiers may only precede the qualifiers in,
2846 * centroid in, out, or centroid out in a declaration. They do not apply
2847 * to the deprecated storage qualifiers varying or centroid varying."
2849 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2851 if (state
->is_version(130, 0)
2852 && this->type
->qualifier
.has_interpolation()
2853 && this->type
->qualifier
.flags
.q
.varying
) {
2855 const char *i
= this->type
->qualifier
.interpolation_string();
2858 if (this->type
->qualifier
.flags
.q
.centroid
)
2859 s
= "centroid varying";
2863 _mesa_glsl_error(&loc
, state
,
2864 "qualifier '%s' cannot be applied to the "
2865 "deprecated storage qualifier '%s'", i
, s
);
2869 /* Interpolation qualifiers can only apply to vertex shader outputs and
2870 * fragment shader inputs.
2872 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2873 * "Outputs from a vertex shader (out) and inputs to a fragment
2874 * shader (in) can be further qualified with one or more of these
2875 * interpolation qualifiers"
2877 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
2878 * "These interpolation qualifiers may only precede the qualifiers
2879 * in, centroid in, out, or centroid out in a declaration. They do
2880 * not apply to inputs into a vertex shader or outputs from a
2883 if (state
->is_version(130, 300)
2884 && this->type
->qualifier
.has_interpolation()) {
2886 const char *i
= this->type
->qualifier
.interpolation_string();
2889 switch (state
->target
) {
2891 if (this->type
->qualifier
.flags
.q
.in
) {
2892 _mesa_glsl_error(&loc
, state
,
2893 "qualifier '%s' cannot be applied to vertex "
2894 "shader inputs", i
);
2897 case fragment_shader
:
2898 if (this->type
->qualifier
.flags
.q
.out
) {
2899 _mesa_glsl_error(&loc
, state
,
2900 "qualifier '%s' cannot be applied to fragment "
2901 "shader outputs", i
);
2910 /* From section 4.3.4 of the GLSL 1.30 spec:
2911 * "It is an error to use centroid in in a vertex shader."
2913 * From section 4.3.4 of the GLSL ES 3.00 spec:
2914 * "It is an error to use centroid in or interpolation qualifiers in
2915 * a vertex shader input."
2917 if (state
->is_version(130, 300)
2918 && this->type
->qualifier
.flags
.q
.centroid
2919 && this->type
->qualifier
.flags
.q
.in
2920 && state
->target
== vertex_shader
) {
2922 _mesa_glsl_error(&loc
, state
,
2923 "'centroid in' cannot be used in a vertex shader");
2927 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2929 if (this->type
->specifier
->precision
!= ast_precision_none
) {
2930 state
->check_precision_qualifiers_allowed(&loc
);
2934 /* Precision qualifiers only apply to floating point and integer types.
2936 * From section 4.5.2 of the GLSL 1.30 spec:
2937 * "Any floating point or any integer declaration can have the type
2938 * preceded by one of these precision qualifiers [...] Literal
2939 * constants do not have precision qualifiers. Neither do Boolean
2942 * In GLSL ES, sampler types are also allowed.
2944 * From page 87 of the GLSL ES spec:
2945 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2947 if (this->type
->specifier
->precision
!= ast_precision_none
2948 && !var
->type
->is_float()
2949 && !var
->type
->is_integer()
2950 && !(var
->type
->is_sampler() && state
->es_shader
)
2951 && !(var
->type
->is_array()
2952 && (var
->type
->fields
.array
->is_float()
2953 || var
->type
->fields
.array
->is_integer()))) {
2955 _mesa_glsl_error(&loc
, state
,
2956 "precision qualifiers apply only to floating point"
2957 "%s types", state
->es_shader
? ", integer, and sampler"
2961 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2963 * "[Sampler types] can only be declared as function
2964 * parameters or uniform variables (see Section 4.3.5
2967 if (var_type
->contains_sampler() &&
2968 !this->type
->qualifier
.flags
.q
.uniform
) {
2969 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2972 /* Process the initializer and add its instructions to a temporary
2973 * list. This list will be added to the instruction stream (below) after
2974 * the declaration is added. This is done because in some cases (such as
2975 * redeclarations) the declaration may not actually be added to the
2976 * instruction stream.
2978 exec_list initializer_instructions
;
2979 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2981 if (decl
->initializer
!= NULL
) {
2982 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2984 &initializer_instructions
, state
);
2987 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2989 * "It is an error to write to a const variable outside of
2990 * its declaration, so they must be initialized when
2993 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2994 _mesa_glsl_error(& loc
, state
,
2995 "const declaration of `%s' must be initialized",
2999 /* If the declaration is not a redeclaration, there are a few additional
3000 * semantic checks that must be applied. In addition, variable that was
3001 * created for the declaration should be added to the IR stream.
3003 if (earlier
== NULL
) {
3004 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3006 * "Identifiers starting with "gl_" are reserved for use by
3007 * OpenGL, and may not be declared in a shader as either a
3008 * variable or a function."
3010 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
3011 _mesa_glsl_error(& loc
, state
,
3012 "identifier `%s' uses reserved `gl_' prefix",
3014 else if (strstr(decl
->identifier
, "__")) {
3015 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3018 * "In addition, all identifiers containing two
3019 * consecutive underscores (__) are reserved as
3020 * possible future keywords."
3022 _mesa_glsl_error(& loc
, state
,
3023 "identifier `%s' uses reserved `__' string",
3027 /* Add the variable to the symbol table. Note that the initializer's
3028 * IR was already processed earlier (though it hasn't been emitted
3029 * yet), without the variable in scope.
3031 * This differs from most C-like languages, but it follows the GLSL
3032 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3035 * "Within a declaration, the scope of a name starts immediately
3036 * after the initializer if present or immediately after the name
3037 * being declared if not."
3039 if (!state
->symbols
->add_variable(var
)) {
3040 YYLTYPE loc
= this->get_location();
3041 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3042 "current scope", decl
->identifier
);
3046 /* Push the variable declaration to the top. It means that all the
3047 * variable declarations will appear in a funny last-to-first order,
3048 * but otherwise we run into trouble if a function is prototyped, a
3049 * global var is decled, then the function is defined with usage of
3050 * the global var. See glslparsertest's CorrectModule.frag.
3052 instructions
->push_head(var
);
3055 instructions
->append_list(&initializer_instructions
);
3059 /* Generally, variable declarations do not have r-values. However,
3060 * one is used for the declaration in
3062 * while (bool b = some_condition()) {
3066 * so we return the rvalue from the last seen declaration here.
3073 ast_parameter_declarator::hir(exec_list
*instructions
,
3074 struct _mesa_glsl_parse_state
*state
)
3077 const struct glsl_type
*type
;
3078 const char *name
= NULL
;
3079 YYLTYPE loc
= this->get_location();
3081 type
= this->type
->specifier
->glsl_type(& name
, state
);
3085 _mesa_glsl_error(& loc
, state
,
3086 "invalid type `%s' in declaration of `%s'",
3087 name
, this->identifier
);
3089 _mesa_glsl_error(& loc
, state
,
3090 "invalid type in declaration of `%s'",
3094 type
= glsl_type::error_type
;
3097 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3099 * "Functions that accept no input arguments need not use void in the
3100 * argument list because prototypes (or definitions) are required and
3101 * therefore there is no ambiguity when an empty argument list "( )" is
3102 * declared. The idiom "(void)" as a parameter list is provided for
3105 * Placing this check here prevents a void parameter being set up
3106 * for a function, which avoids tripping up checks for main taking
3107 * parameters and lookups of an unnamed symbol.
3109 if (type
->is_void()) {
3110 if (this->identifier
!= NULL
)
3111 _mesa_glsl_error(& loc
, state
,
3112 "named parameter cannot have type `void'");
3118 if (formal_parameter
&& (this->identifier
== NULL
)) {
3119 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3123 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3124 * call already handled the "vec4[..] foo" case.
3126 if (this->is_array
) {
3127 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3130 if (!type
->is_error() && type
->array_size() == 0) {
3131 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3132 "a declared size.");
3133 type
= glsl_type::error_type
;
3137 ir_variable
*var
= new(ctx
)
3138 ir_variable(type
, this->identifier
, ir_var_function_in
);
3140 /* Apply any specified qualifiers to the parameter declaration. Note that
3141 * for function parameters the default mode is 'in'.
3143 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3146 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3148 * "Samplers cannot be treated as l-values; hence cannot be used
3149 * as out or inout function parameters, nor can they be assigned
3152 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3153 && type
->contains_sampler()) {
3154 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3155 type
= glsl_type::error_type
;
3158 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3160 * "When calling a function, expressions that do not evaluate to
3161 * l-values cannot be passed to parameters declared as out or inout."
3163 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3165 * "Other binary or unary expressions, non-dereferenced arrays,
3166 * function names, swizzles with repeated fields, and constants
3167 * cannot be l-values."
3169 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3170 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3172 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3174 && !state
->check_version(120, 100, &loc
,
3175 "Arrays cannot be out or inout parameters")) {
3176 type
= glsl_type::error_type
;
3179 instructions
->push_tail(var
);
3181 /* Parameter declarations do not have r-values.
3188 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3190 exec_list
*ir_parameters
,
3191 _mesa_glsl_parse_state
*state
)
3193 ast_parameter_declarator
*void_param
= NULL
;
3196 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3197 param
->formal_parameter
= formal
;
3198 param
->hir(ir_parameters
, state
);
3206 if ((void_param
!= NULL
) && (count
> 1)) {
3207 YYLTYPE loc
= void_param
->get_location();
3209 _mesa_glsl_error(& loc
, state
,
3210 "`void' parameter must be only parameter");
3216 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3218 /* IR invariants disallow function declarations or definitions
3219 * nested within other function definitions. But there is no
3220 * requirement about the relative order of function declarations
3221 * and definitions with respect to one another. So simply insert
3222 * the new ir_function block at the end of the toplevel instruction
3225 state
->toplevel_ir
->push_tail(f
);
3230 ast_function::hir(exec_list
*instructions
,
3231 struct _mesa_glsl_parse_state
*state
)
3234 ir_function
*f
= NULL
;
3235 ir_function_signature
*sig
= NULL
;
3236 exec_list hir_parameters
;
3238 const char *const name
= identifier
;
3240 /* New functions are always added to the top-level IR instruction stream,
3241 * so this instruction list pointer is ignored. See also emit_function
3244 (void) instructions
;
3246 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3248 * "Function declarations (prototypes) cannot occur inside of functions;
3249 * they must be at global scope, or for the built-in functions, outside
3250 * the global scope."
3252 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3254 * "User defined functions may only be defined within the global scope."
3256 * Note that this language does not appear in GLSL 1.10.
3258 if ((state
->current_function
!= NULL
) &&
3259 state
->is_version(120, 100)) {
3260 YYLTYPE loc
= this->get_location();
3261 _mesa_glsl_error(&loc
, state
,
3262 "declaration of function `%s' not allowed within "
3263 "function body", name
);
3266 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3268 * "Identifiers starting with "gl_" are reserved for use by
3269 * OpenGL, and may not be declared in a shader as either a
3270 * variable or a function."
3272 if (strncmp(name
, "gl_", 3) == 0) {
3273 YYLTYPE loc
= this->get_location();
3274 _mesa_glsl_error(&loc
, state
,
3275 "identifier `%s' uses reserved `gl_' prefix", name
);
3278 /* Convert the list of function parameters to HIR now so that they can be
3279 * used below to compare this function's signature with previously seen
3280 * signatures for functions with the same name.
3282 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3284 & hir_parameters
, state
);
3286 const char *return_type_name
;
3287 const glsl_type
*return_type
=
3288 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3291 YYLTYPE loc
= this->get_location();
3292 _mesa_glsl_error(&loc
, state
,
3293 "function `%s' has undeclared return type `%s'",
3294 name
, return_type_name
);
3295 return_type
= glsl_type::error_type
;
3298 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3299 * "No qualifier is allowed on the return type of a function."
3301 if (this->return_type
->has_qualifiers()) {
3302 YYLTYPE loc
= this->get_location();
3303 _mesa_glsl_error(& loc
, state
,
3304 "function `%s' return type has qualifiers", name
);
3307 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3309 * "[Sampler types] can only be declared as function parameters
3310 * or uniform variables (see Section 4.3.5 "Uniform")".
3312 if (return_type
->contains_sampler()) {
3313 YYLTYPE loc
= this->get_location();
3314 _mesa_glsl_error(&loc
, state
,
3315 "function `%s' return type can't contain a sampler",
3319 /* Verify that this function's signature either doesn't match a previously
3320 * seen signature for a function with the same name, or, if a match is found,
3321 * that the previously seen signature does not have an associated definition.
3323 f
= state
->symbols
->get_function(name
);
3324 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3325 sig
= f
->exact_matching_signature(&hir_parameters
);
3327 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3328 if (badvar
!= NULL
) {
3329 YYLTYPE loc
= this->get_location();
3331 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3332 "qualifiers don't match prototype", name
, badvar
);
3335 if (sig
->return_type
!= return_type
) {
3336 YYLTYPE loc
= this->get_location();
3338 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3339 "match prototype", name
);
3342 if (is_definition
&& sig
->is_defined
) {
3343 YYLTYPE loc
= this->get_location();
3345 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3349 f
= new(ctx
) ir_function(name
);
3350 if (!state
->symbols
->add_function(f
)) {
3351 /* This function name shadows a non-function use of the same name. */
3352 YYLTYPE loc
= this->get_location();
3354 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3355 "non-function", name
);
3359 emit_function(state
, f
);
3362 /* Verify the return type of main() */
3363 if (strcmp(name
, "main") == 0) {
3364 if (! return_type
->is_void()) {
3365 YYLTYPE loc
= this->get_location();
3367 _mesa_glsl_error(& loc
, state
, "main() must return void");
3370 if (!hir_parameters
.is_empty()) {
3371 YYLTYPE loc
= this->get_location();
3373 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3377 /* Finish storing the information about this new function in its signature.
3380 sig
= new(ctx
) ir_function_signature(return_type
);
3381 f
->add_signature(sig
);
3384 sig
->replace_parameters(&hir_parameters
);
3387 /* Function declarations (prototypes) do not have r-values.
3394 ast_function_definition::hir(exec_list
*instructions
,
3395 struct _mesa_glsl_parse_state
*state
)
3397 prototype
->is_definition
= true;
3398 prototype
->hir(instructions
, state
);
3400 ir_function_signature
*signature
= prototype
->signature
;
3401 if (signature
== NULL
)
3404 assert(state
->current_function
== NULL
);
3405 state
->current_function
= signature
;
3406 state
->found_return
= false;
3408 /* Duplicate parameters declared in the prototype as concrete variables.
3409 * Add these to the symbol table.
3411 state
->symbols
->push_scope();
3412 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3413 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3415 assert(var
!= NULL
);
3417 /* The only way a parameter would "exist" is if two parameters have
3420 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3421 YYLTYPE loc
= this->get_location();
3423 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3425 state
->symbols
->add_variable(var
);
3429 /* Convert the body of the function to HIR. */
3430 this->body
->hir(&signature
->body
, state
);
3431 signature
->is_defined
= true;
3433 state
->symbols
->pop_scope();
3435 assert(state
->current_function
== signature
);
3436 state
->current_function
= NULL
;
3438 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3439 YYLTYPE loc
= this->get_location();
3440 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3441 "%s, but no return statement",
3442 signature
->function_name(),
3443 signature
->return_type
->name
);
3446 /* Function definitions do not have r-values.
3453 ast_jump_statement::hir(exec_list
*instructions
,
3454 struct _mesa_glsl_parse_state
*state
)
3461 assert(state
->current_function
);
3463 if (opt_return_value
) {
3464 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3466 /* The value of the return type can be NULL if the shader says
3467 * 'return foo();' and foo() is a function that returns void.
3469 * NOTE: The GLSL spec doesn't say that this is an error. The type
3470 * of the return value is void. If the return type of the function is
3471 * also void, then this should compile without error. Seriously.
3473 const glsl_type
*const ret_type
=
3474 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3476 /* Implicit conversions are not allowed for return values. */
3477 if (state
->current_function
->return_type
!= ret_type
) {
3478 YYLTYPE loc
= this->get_location();
3480 _mesa_glsl_error(& loc
, state
,
3481 "`return' with wrong type %s, in function `%s' "
3484 state
->current_function
->function_name(),
3485 state
->current_function
->return_type
->name
);
3488 inst
= new(ctx
) ir_return(ret
);
3490 if (state
->current_function
->return_type
->base_type
!=
3492 YYLTYPE loc
= this->get_location();
3494 _mesa_glsl_error(& loc
, state
,
3495 "`return' with no value, in function %s returning "
3497 state
->current_function
->function_name());
3499 inst
= new(ctx
) ir_return
;
3502 state
->found_return
= true;
3503 instructions
->push_tail(inst
);
3508 if (state
->target
!= fragment_shader
) {
3509 YYLTYPE loc
= this->get_location();
3511 _mesa_glsl_error(& loc
, state
,
3512 "`discard' may only appear in a fragment shader");
3514 instructions
->push_tail(new(ctx
) ir_discard
);
3519 if (mode
== ast_continue
&&
3520 state
->loop_nesting_ast
== NULL
) {
3521 YYLTYPE loc
= this->get_location();
3523 _mesa_glsl_error(& loc
, state
,
3524 "continue may only appear in a loop");
3525 } else if (mode
== ast_break
&&
3526 state
->loop_nesting_ast
== NULL
&&
3527 state
->switch_state
.switch_nesting_ast
== NULL
) {
3528 YYLTYPE loc
= this->get_location();
3530 _mesa_glsl_error(& loc
, state
,
3531 "break may only appear in a loop or a switch");
3533 /* For a loop, inline the for loop expression again,
3534 * since we don't know where near the end of
3535 * the loop body the normal copy of it
3536 * is going to be placed.
3538 if (state
->loop_nesting_ast
!= NULL
&&
3539 mode
== ast_continue
&&
3540 state
->loop_nesting_ast
->rest_expression
) {
3541 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3545 if (state
->switch_state
.is_switch_innermost
&&
3546 mode
== ast_break
) {
3547 /* Force break out of switch by setting is_break switch state.
3549 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3550 ir_dereference_variable
*const deref_is_break_var
=
3551 new(ctx
) ir_dereference_variable(is_break_var
);
3552 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3553 ir_assignment
*const set_break_var
=
3554 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3556 instructions
->push_tail(set_break_var
);
3559 ir_loop_jump
*const jump
=
3560 new(ctx
) ir_loop_jump((mode
== ast_break
)
3561 ? ir_loop_jump::jump_break
3562 : ir_loop_jump::jump_continue
);
3563 instructions
->push_tail(jump
);
3570 /* Jump instructions do not have r-values.
3577 ast_selection_statement::hir(exec_list
*instructions
,
3578 struct _mesa_glsl_parse_state
*state
)
3582 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3584 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3586 * "Any expression whose type evaluates to a Boolean can be used as the
3587 * conditional expression bool-expression. Vector types are not accepted
3588 * as the expression to if."
3590 * The checks are separated so that higher quality diagnostics can be
3591 * generated for cases where both rules are violated.
3593 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3594 YYLTYPE loc
= this->condition
->get_location();
3596 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3600 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3602 if (then_statement
!= NULL
) {
3603 state
->symbols
->push_scope();
3604 then_statement
->hir(& stmt
->then_instructions
, state
);
3605 state
->symbols
->pop_scope();
3608 if (else_statement
!= NULL
) {
3609 state
->symbols
->push_scope();
3610 else_statement
->hir(& stmt
->else_instructions
, state
);
3611 state
->symbols
->pop_scope();
3614 instructions
->push_tail(stmt
);
3616 /* if-statements do not have r-values.
3623 ast_switch_statement::hir(exec_list
*instructions
,
3624 struct _mesa_glsl_parse_state
*state
)
3628 ir_rvalue
*const test_expression
=
3629 this->test_expression
->hir(instructions
, state
);
3631 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3633 * "The type of init-expression in a switch statement must be a
3636 if (!test_expression
->type
->is_scalar() ||
3637 !test_expression
->type
->is_integer()) {
3638 YYLTYPE loc
= this->test_expression
->get_location();
3640 _mesa_glsl_error(& loc
,
3642 "switch-statement expression must be scalar "
3646 /* Track the switch-statement nesting in a stack-like manner.
3648 struct glsl_switch_state saved
= state
->switch_state
;
3650 state
->switch_state
.is_switch_innermost
= true;
3651 state
->switch_state
.switch_nesting_ast
= this;
3652 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3653 hash_table_pointer_compare
);
3654 state
->switch_state
.previous_default
= NULL
;
3656 /* Initalize is_fallthru state to false.
3658 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3659 state
->switch_state
.is_fallthru_var
=
3660 new(ctx
) ir_variable(glsl_type::bool_type
,
3661 "switch_is_fallthru_tmp",
3663 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3665 ir_dereference_variable
*deref_is_fallthru_var
=
3666 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3667 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3670 /* Initalize is_break state to false.
3672 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3673 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3674 "switch_is_break_tmp",
3676 instructions
->push_tail(state
->switch_state
.is_break_var
);
3678 ir_dereference_variable
*deref_is_break_var
=
3679 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3680 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3683 /* Cache test expression.
3685 test_to_hir(instructions
, state
);
3687 /* Emit code for body of switch stmt.
3689 body
->hir(instructions
, state
);
3691 hash_table_dtor(state
->switch_state
.labels_ht
);
3693 state
->switch_state
= saved
;
3695 /* Switch statements do not have r-values. */
3701 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3702 struct _mesa_glsl_parse_state
*state
)
3706 /* Cache value of test expression. */
3707 ir_rvalue
*const test_val
=
3708 test_expression
->hir(instructions
,
3711 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3714 ir_dereference_variable
*deref_test_var
=
3715 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3717 instructions
->push_tail(state
->switch_state
.test_var
);
3718 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
3723 ast_switch_body::hir(exec_list
*instructions
,
3724 struct _mesa_glsl_parse_state
*state
)
3727 stmts
->hir(instructions
, state
);
3729 /* Switch bodies do not have r-values. */
3734 ast_case_statement_list::hir(exec_list
*instructions
,
3735 struct _mesa_glsl_parse_state
*state
)
3737 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3738 case_stmt
->hir(instructions
, state
);
3740 /* Case statements do not have r-values. */
3745 ast_case_statement::hir(exec_list
*instructions
,
3746 struct _mesa_glsl_parse_state
*state
)
3748 labels
->hir(instructions
, state
);
3750 /* Conditionally set fallthru state based on break state. */
3751 ir_constant
*const false_val
= new(state
) ir_constant(false);
3752 ir_dereference_variable
*const deref_is_fallthru_var
=
3753 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3754 ir_dereference_variable
*const deref_is_break_var
=
3755 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3756 ir_assignment
*const reset_fallthru_on_break
=
3757 new(state
) ir_assignment(deref_is_fallthru_var
,
3759 deref_is_break_var
);
3760 instructions
->push_tail(reset_fallthru_on_break
);
3762 /* Guard case statements depending on fallthru state. */
3763 ir_dereference_variable
*const deref_fallthru_guard
=
3764 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3765 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3767 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3768 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3770 instructions
->push_tail(test_fallthru
);
3772 /* Case statements do not have r-values. */
3778 ast_case_label_list::hir(exec_list
*instructions
,
3779 struct _mesa_glsl_parse_state
*state
)
3781 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3782 label
->hir(instructions
, state
);
3784 /* Case labels do not have r-values. */
3789 ast_case_label::hir(exec_list
*instructions
,
3790 struct _mesa_glsl_parse_state
*state
)
3794 ir_dereference_variable
*deref_fallthru_var
=
3795 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3797 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3799 /* If not default case, ... */
3800 if (this->test_value
!= NULL
) {
3801 /* Conditionally set fallthru state based on
3802 * comparison of cached test expression value to case label.
3804 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3805 ir_constant
*label_const
= label_rval
->constant_expression_value();
3808 YYLTYPE loc
= this->test_value
->get_location();
3810 _mesa_glsl_error(& loc
, state
,
3811 "switch statement case label must be a "
3812 "constant expression");
3814 /* Stuff a dummy value in to allow processing to continue. */
3815 label_const
= new(ctx
) ir_constant(0);
3817 ast_expression
*previous_label
= (ast_expression
*)
3818 hash_table_find(state
->switch_state
.labels_ht
,
3819 (void *)(uintptr_t)label_const
->value
.u
[0]);
3821 if (previous_label
) {
3822 YYLTYPE loc
= this->test_value
->get_location();
3823 _mesa_glsl_error(& loc
, state
,
3824 "duplicate case value");
3826 loc
= previous_label
->get_location();
3827 _mesa_glsl_error(& loc
, state
,
3828 "this is the previous case label");
3830 hash_table_insert(state
->switch_state
.labels_ht
,
3832 (void *)(uintptr_t)label_const
->value
.u
[0]);
3836 ir_dereference_variable
*deref_test_var
=
3837 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3839 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3843 ir_assignment
*set_fallthru_on_test
=
3844 new(ctx
) ir_assignment(deref_fallthru_var
,
3848 instructions
->push_tail(set_fallthru_on_test
);
3849 } else { /* default case */
3850 if (state
->switch_state
.previous_default
) {
3851 YYLTYPE loc
= this->get_location();
3852 _mesa_glsl_error(& loc
, state
,
3853 "multiple default labels in one switch");
3855 loc
= state
->switch_state
.previous_default
->get_location();
3856 _mesa_glsl_error(& loc
, state
,
3857 "this is the first default label");
3859 state
->switch_state
.previous_default
= this;
3861 /* Set falltrhu state. */
3862 ir_assignment
*set_fallthru
=
3863 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
3865 instructions
->push_tail(set_fallthru
);
3868 /* Case statements do not have r-values. */
3873 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3874 struct _mesa_glsl_parse_state
*state
)
3878 if (condition
!= NULL
) {
3879 ir_rvalue
*const cond
=
3880 condition
->hir(& stmt
->body_instructions
, state
);
3883 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3884 YYLTYPE loc
= condition
->get_location();
3886 _mesa_glsl_error(& loc
, state
,
3887 "loop condition must be scalar boolean");
3889 /* As the first code in the loop body, generate a block that looks
3890 * like 'if (!condition) break;' as the loop termination condition.
3892 ir_rvalue
*const not_cond
=
3893 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
3895 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3897 ir_jump
*const break_stmt
=
3898 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3900 if_stmt
->then_instructions
.push_tail(break_stmt
);
3901 stmt
->body_instructions
.push_tail(if_stmt
);
3908 ast_iteration_statement::hir(exec_list
*instructions
,
3909 struct _mesa_glsl_parse_state
*state
)
3913 /* For-loops and while-loops start a new scope, but do-while loops do not.
3915 if (mode
!= ast_do_while
)
3916 state
->symbols
->push_scope();
3918 if (init_statement
!= NULL
)
3919 init_statement
->hir(instructions
, state
);
3921 ir_loop
*const stmt
= new(ctx
) ir_loop();
3922 instructions
->push_tail(stmt
);
3924 /* Track the current loop nesting. */
3925 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3927 state
->loop_nesting_ast
= this;
3929 /* Likewise, indicate that following code is closest to a loop,
3930 * NOT closest to a switch.
3932 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3933 state
->switch_state
.is_switch_innermost
= false;
3935 if (mode
!= ast_do_while
)
3936 condition_to_hir(stmt
, state
);
3939 body
->hir(& stmt
->body_instructions
, state
);
3941 if (rest_expression
!= NULL
)
3942 rest_expression
->hir(& stmt
->body_instructions
, state
);
3944 if (mode
== ast_do_while
)
3945 condition_to_hir(stmt
, state
);
3947 if (mode
!= ast_do_while
)
3948 state
->symbols
->pop_scope();
3950 /* Restore previous nesting before returning. */
3951 state
->loop_nesting_ast
= nesting_ast
;
3952 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3954 /* Loops do not have r-values.
3961 ast_type_specifier::hir(exec_list
*instructions
,
3962 struct _mesa_glsl_parse_state
*state
)
3964 if (!this->is_precision_statement
&& this->structure
== NULL
)
3967 YYLTYPE loc
= this->get_location();
3969 if (this->precision
!= ast_precision_none
3970 && !state
->check_precision_qualifiers_allowed(&loc
)) {
3973 if (this->precision
!= ast_precision_none
3974 && this->structure
!= NULL
) {
3975 _mesa_glsl_error(&loc
, state
,
3976 "precision qualifiers do not apply to structures");
3980 /* If this is a precision statement, check that the type to which it is
3981 * applied is either float or int.
3983 * From section 4.5.3 of the GLSL 1.30 spec:
3984 * "The precision statement
3985 * precision precision-qualifier type;
3986 * can be used to establish a default precision qualifier. The type
3987 * field can be either int or float [...]. Any other types or
3988 * qualifiers will result in an error.
3990 if (this->is_precision_statement
) {
3991 assert(this->precision
!= ast_precision_none
);
3992 assert(this->structure
== NULL
); /* The check for structures was
3993 * performed above. */
3994 if (this->is_array
) {
3995 _mesa_glsl_error(&loc
, state
,
3996 "default precision statements do not apply to "
4000 if (strcmp(this->type_name
, "float") != 0 &&
4001 strcmp(this->type_name
, "int") != 0) {
4002 _mesa_glsl_error(&loc
, state
,
4003 "default precision statements apply only to types "
4008 /* FINISHME: Translate precision statements into IR. */
4012 if (this->structure
!= NULL
)
4013 return this->structure
->hir(instructions
, state
);
4020 ast_struct_specifier::hir(exec_list
*instructions
,
4021 struct _mesa_glsl_parse_state
*state
)
4023 unsigned decl_count
= 0;
4025 /* Make an initial pass over the list of structure fields to determine how
4026 * many there are. Each element in this list is an ast_declarator_list.
4027 * This means that we actually need to count the number of elements in the
4028 * 'declarations' list in each of the elements.
4030 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
4031 &this->declarations
) {
4032 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4037 /* Allocate storage for the structure fields and process the field
4038 * declarations. As the declarations are processed, try to also convert
4039 * the types to HIR. This ensures that structure definitions embedded in
4040 * other structure definitions are processed.
4042 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4046 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
4047 &this->declarations
) {
4048 const char *type_name
;
4050 decl_list
->type
->specifier
->hir(instructions
, state
);
4052 /* Section 10.9 of the GLSL ES 1.00 specification states that
4053 * embedded structure definitions have been removed from the language.
4055 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4056 YYLTYPE loc
= this->get_location();
4057 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
4058 "not allowed in GLSL ES 1.00.");
4061 const glsl_type
*decl_type
=
4062 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
4064 foreach_list_typed (ast_declaration
, decl
, link
,
4065 &decl_list
->declarations
) {
4066 const struct glsl_type
*field_type
= decl_type
;
4067 if (decl
->is_array
) {
4068 YYLTYPE loc
= decl
->get_location();
4069 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4072 fields
[i
].type
= (field_type
!= NULL
)
4073 ? field_type
: glsl_type::error_type
;
4074 fields
[i
].name
= decl
->identifier
;
4079 assert(i
== decl_count
);
4081 const glsl_type
*t
=
4082 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4084 YYLTYPE loc
= this->get_location();
4085 if (!state
->symbols
->add_type(name
, t
)) {
4086 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4088 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4090 state
->num_user_structures
+ 1);
4092 s
[state
->num_user_structures
] = t
;
4093 state
->user_structures
= s
;
4094 state
->num_user_structures
++;
4098 /* Structure type definitions do not have r-values.
4103 static struct gl_uniform_block
*
4104 get_next_uniform_block(struct _mesa_glsl_parse_state
*state
)
4106 if (state
->num_uniform_blocks
>= state
->uniform_block_array_size
) {
4107 state
->uniform_block_array_size
*= 2;
4108 if (state
->uniform_block_array_size
<= 4)
4109 state
->uniform_block_array_size
= 4;
4111 state
->uniform_blocks
= reralloc(state
,
4112 state
->uniform_blocks
,
4113 struct gl_uniform_block
,
4114 state
->uniform_block_array_size
);
4117 memset(&state
->uniform_blocks
[state
->num_uniform_blocks
],
4118 0, sizeof(*state
->uniform_blocks
));
4119 return &state
->uniform_blocks
[state
->num_uniform_blocks
++];
4123 ast_uniform_block::hir(exec_list
*instructions
,
4124 struct _mesa_glsl_parse_state
*state
)
4126 /* The ast_uniform_block has a list of ast_declarator_lists. We
4127 * need to turn those into ir_variables with an association
4128 * with this uniform block.
4130 struct gl_uniform_block
*ubo
= get_next_uniform_block(state
);
4131 ubo
->Name
= ralloc_strdup(state
->uniform_blocks
, this->block_name
);
4133 if (!state
->symbols
->add_uniform_block(ubo
)) {
4134 YYLTYPE loc
= this->get_location();
4135 _mesa_glsl_error(&loc
, state
, "Uniform block name `%s' already taken in "
4136 "the current scope.\n", ubo
->Name
);
4139 unsigned int num_variables
= 0;
4140 foreach_list_typed(ast_declarator_list
, decl_list
, link
, &declarations
) {
4141 foreach_list_const(node
, &decl_list
->declarations
) {
4146 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4148 ubo
->Uniforms
= rzalloc_array(state
->uniform_blocks
,
4149 struct gl_uniform_buffer_variable
,
4152 foreach_list_typed(ast_declarator_list
, decl_list
, link
, &declarations
) {
4153 exec_list declared_variables
;
4155 decl_list
->hir(&declared_variables
, state
);
4157 foreach_list_const(node
, &declared_variables
) {
4158 ir_variable
*var
= (ir_variable
*)node
;
4160 struct gl_uniform_buffer_variable
*ubo_var
=
4161 &ubo
->Uniforms
[ubo
->NumUniforms
++];
4163 var
->uniform_block
= ubo
- state
->uniform_blocks
;
4165 ubo_var
->Name
= ralloc_strdup(state
->uniform_blocks
, var
->name
);
4166 ubo_var
->Type
= var
->type
;
4167 ubo_var
->Offset
= 0; /* Assigned at link time. */
4169 if (var
->type
->is_matrix() ||
4170 (var
->type
->is_array() && var
->type
->fields
.array
->is_matrix())) {
4171 ubo_var
->RowMajor
= block_row_major
;
4172 if (decl_list
->type
->qualifier
.flags
.q
.row_major
)
4173 ubo_var
->RowMajor
= true;
4174 else if (decl_list
->type
->qualifier
.flags
.q
.column_major
)
4175 ubo_var
->RowMajor
= false;
4178 /* From the GL_ARB_uniform_buffer_object spec:
4180 * "Sampler types are not allowed inside of uniform
4181 * blocks. All other types, arrays, and structures
4182 * allowed for uniforms are allowed within a uniform
4185 if (var
->type
->contains_sampler()) {
4186 YYLTYPE loc
= decl_list
->get_location();
4187 _mesa_glsl_error(&loc
, state
,
4188 "Uniform in non-default uniform block contains sampler\n");
4192 instructions
->append_list(&declared_variables
);
4199 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
4200 exec_list
*instructions
)
4202 bool gl_FragColor_assigned
= false;
4203 bool gl_FragData_assigned
= false;
4204 bool user_defined_fs_output_assigned
= false;
4205 ir_variable
*user_defined_fs_output
= NULL
;
4207 /* It would be nice to have proper location information. */
4209 memset(&loc
, 0, sizeof(loc
));
4211 foreach_list(node
, instructions
) {
4212 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4214 if (!var
|| !var
->assigned
)
4217 if (strcmp(var
->name
, "gl_FragColor") == 0)
4218 gl_FragColor_assigned
= true;
4219 else if (strcmp(var
->name
, "gl_FragData") == 0)
4220 gl_FragData_assigned
= true;
4221 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4222 if (state
->target
== fragment_shader
&&
4223 var
->mode
== ir_var_shader_out
) {
4224 user_defined_fs_output_assigned
= true;
4225 user_defined_fs_output
= var
;
4230 /* From the GLSL 1.30 spec:
4232 * "If a shader statically assigns a value to gl_FragColor, it
4233 * may not assign a value to any element of gl_FragData. If a
4234 * shader statically writes a value to any element of
4235 * gl_FragData, it may not assign a value to
4236 * gl_FragColor. That is, a shader may assign values to either
4237 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4238 * linked together must also consistently write just one of
4239 * these variables. Similarly, if user declared output
4240 * variables are in use (statically assigned to), then the
4241 * built-in variables gl_FragColor and gl_FragData may not be
4242 * assigned to. These incorrect usages all generate compile
4245 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
4246 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4247 "`gl_FragColor' and `gl_FragData'\n");
4248 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
4249 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4250 "`gl_FragColor' and `%s'\n",
4251 user_defined_fs_output
->name
);
4252 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
4253 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4254 "`gl_FragData' and `%s'\n",
4255 user_defined_fs_output
->name
);