2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
57 #include "program/hash_table.h"
61 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
62 exec_list
*instructions
);
65 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
67 _mesa_glsl_initialize_variables(instructions
, state
);
69 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
71 state
->current_function
= NULL
;
73 state
->toplevel_ir
= instructions
;
75 /* Section 4.2 of the GLSL 1.20 specification states:
76 * "The built-in functions are scoped in a scope outside the global scope
77 * users declare global variables in. That is, a shader's global scope,
78 * available for user-defined functions and global variables, is nested
79 * inside the scope containing the built-in functions."
81 * Since built-in functions like ftransform() access built-in variables,
82 * it follows that those must be in the outer scope as well.
84 * We push scope here to create this nesting effect...but don't pop.
85 * This way, a shader's globals are still in the symbol table for use
88 state
->symbols
->push_scope();
90 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
91 ast
->hir(instructions
, state
);
93 detect_recursion_unlinked(state
, instructions
);
94 detect_conflicting_assignments(state
, instructions
);
96 state
->toplevel_ir
= NULL
;
101 * If a conversion is available, convert one operand to a different type
103 * The \c from \c ir_rvalue is converted "in place".
105 * \param to Type that the operand it to be converted to
106 * \param from Operand that is being converted
107 * \param state GLSL compiler state
110 * If a conversion is possible (or unnecessary), \c true is returned.
111 * Otherwise \c false is returned.
114 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
115 struct _mesa_glsl_parse_state
*state
)
118 if (to
->base_type
== from
->type
->base_type
)
121 /* This conversion was added in GLSL 1.20. If the compilation mode is
122 * GLSL 1.10, the conversion is skipped.
124 if (!state
->is_version(120, 0))
127 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
129 * "There are no implicit array or structure conversions. For
130 * example, an array of int cannot be implicitly converted to an
131 * array of float. There are no implicit conversions between
132 * signed and unsigned integers."
134 /* FINISHME: The above comment is partially a lie. There is int/uint
135 * FINISHME: conversion for immediate constants.
137 if (!to
->is_float() || !from
->type
->is_numeric())
140 /* Convert to a floating point type with the same number of components
141 * as the original type - i.e. int to float, not int to vec4.
143 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
144 from
->type
->matrix_columns
);
146 switch (from
->type
->base_type
) {
148 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
151 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
154 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
164 static const struct glsl_type
*
165 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
167 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
169 const glsl_type
*type_a
= value_a
->type
;
170 const glsl_type
*type_b
= value_b
->type
;
172 /* From GLSL 1.50 spec, page 56:
174 * "The arithmetic binary operators add (+), subtract (-),
175 * multiply (*), and divide (/) operate on integer and
176 * floating-point scalars, vectors, and matrices."
178 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
179 _mesa_glsl_error(loc
, state
,
180 "Operands to arithmetic operators must be numeric");
181 return glsl_type::error_type
;
185 /* "If one operand is floating-point based and the other is
186 * not, then the conversions from Section 4.1.10 "Implicit
187 * Conversions" are applied to the non-floating-point-based operand."
189 if (!apply_implicit_conversion(type_a
, value_b
, state
)
190 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
191 _mesa_glsl_error(loc
, state
,
192 "Could not implicitly convert operands to "
193 "arithmetic operator");
194 return glsl_type::error_type
;
196 type_a
= value_a
->type
;
197 type_b
= value_b
->type
;
199 /* "If the operands are integer types, they must both be signed or
202 * From this rule and the preceeding conversion it can be inferred that
203 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
204 * The is_numeric check above already filtered out the case where either
205 * type is not one of these, so now the base types need only be tested for
208 if (type_a
->base_type
!= type_b
->base_type
) {
209 _mesa_glsl_error(loc
, state
,
210 "base type mismatch for arithmetic operator");
211 return glsl_type::error_type
;
214 /* "All arithmetic binary operators result in the same fundamental type
215 * (signed integer, unsigned integer, or floating-point) as the
216 * operands they operate on, after operand type conversion. After
217 * conversion, the following cases are valid
219 * * The two operands are scalars. In this case the operation is
220 * applied, resulting in a scalar."
222 if (type_a
->is_scalar() && type_b
->is_scalar())
225 /* "* One operand is a scalar, and the other is a vector or matrix.
226 * In this case, the scalar operation is applied independently to each
227 * component of the vector or matrix, resulting in the same size
230 if (type_a
->is_scalar()) {
231 if (!type_b
->is_scalar())
233 } else if (type_b
->is_scalar()) {
237 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
238 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
241 assert(!type_a
->is_scalar());
242 assert(!type_b
->is_scalar());
244 /* "* The two operands are vectors of the same size. In this case, the
245 * operation is done component-wise resulting in the same size
248 if (type_a
->is_vector() && type_b
->is_vector()) {
249 if (type_a
== type_b
) {
252 _mesa_glsl_error(loc
, state
,
253 "vector size mismatch for arithmetic operator");
254 return glsl_type::error_type
;
258 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
259 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
260 * <vector, vector> have been handled. At least one of the operands must
261 * be matrix. Further, since there are no integer matrix types, the base
262 * type of both operands must be float.
264 assert(type_a
->is_matrix() || type_b
->is_matrix());
265 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
266 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
268 /* "* The operator is add (+), subtract (-), or divide (/), and the
269 * operands are matrices with the same number of rows and the same
270 * number of columns. In this case, the operation is done component-
271 * wise resulting in the same size matrix."
272 * * The operator is multiply (*), where both operands are matrices or
273 * one operand is a vector and the other a matrix. A right vector
274 * operand is treated as a column vector and a left vector operand as a
275 * row vector. In all these cases, it is required that the number of
276 * columns of the left operand is equal to the number of rows of the
277 * right operand. Then, the multiply (*) operation does a linear
278 * algebraic multiply, yielding an object that has the same number of
279 * rows as the left operand and the same number of columns as the right
280 * operand. Section 5.10 "Vector and Matrix Operations" explains in
281 * more detail how vectors and matrices are operated on."
284 if (type_a
== type_b
)
287 if (type_a
->is_matrix() && type_b
->is_matrix()) {
288 /* Matrix multiply. The columns of A must match the rows of B. Given
289 * the other previously tested constraints, this means the vector type
290 * of a row from A must be the same as the vector type of a column from
293 if (type_a
->row_type() == type_b
->column_type()) {
294 /* The resulting matrix has the number of columns of matrix B and
295 * the number of rows of matrix A. We get the row count of A by
296 * looking at the size of a vector that makes up a column. The
297 * transpose (size of a row) is done for B.
299 const glsl_type
*const type
=
300 glsl_type::get_instance(type_a
->base_type
,
301 type_a
->column_type()->vector_elements
,
302 type_b
->row_type()->vector_elements
);
303 assert(type
!= glsl_type::error_type
);
307 } else if (type_a
->is_matrix()) {
308 /* A is a matrix and B is a column vector. Columns of A must match
309 * rows of B. Given the other previously tested constraints, this
310 * means the vector type of a row from A must be the same as the
311 * vector the type of B.
313 if (type_a
->row_type() == type_b
) {
314 /* The resulting vector has a number of elements equal to
315 * the number of rows of matrix A. */
316 const glsl_type
*const type
=
317 glsl_type::get_instance(type_a
->base_type
,
318 type_a
->column_type()->vector_elements
,
320 assert(type
!= glsl_type::error_type
);
325 assert(type_b
->is_matrix());
327 /* A is a row vector and B is a matrix. Columns of A must match rows
328 * of B. Given the other previously tested constraints, this means
329 * the type of A must be the same as the vector type of a column from
332 if (type_a
== type_b
->column_type()) {
333 /* The resulting vector has a number of elements equal to
334 * the number of columns of matrix B. */
335 const glsl_type
*const type
=
336 glsl_type::get_instance(type_a
->base_type
,
337 type_b
->row_type()->vector_elements
,
339 assert(type
!= glsl_type::error_type
);
345 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
346 return glsl_type::error_type
;
350 /* "All other cases are illegal."
352 _mesa_glsl_error(loc
, state
, "type mismatch");
353 return glsl_type::error_type
;
357 static const struct glsl_type
*
358 unary_arithmetic_result_type(const struct glsl_type
*type
,
359 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
361 /* From GLSL 1.50 spec, page 57:
363 * "The arithmetic unary operators negate (-), post- and pre-increment
364 * and decrement (-- and ++) operate on integer or floating-point
365 * values (including vectors and matrices). All unary operators work
366 * component-wise on their operands. These result with the same type
369 if (!type
->is_numeric()) {
370 _mesa_glsl_error(loc
, state
,
371 "Operands to arithmetic operators must be numeric");
372 return glsl_type::error_type
;
379 * \brief Return the result type of a bit-logic operation.
381 * If the given types to the bit-logic operator are invalid, return
382 * glsl_type::error_type.
384 * \param type_a Type of LHS of bit-logic op
385 * \param type_b Type of RHS of bit-logic op
387 static const struct glsl_type
*
388 bit_logic_result_type(const struct glsl_type
*type_a
,
389 const struct glsl_type
*type_b
,
391 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
393 if (!state
->check_bitwise_operations_allowed(loc
)) {
394 return glsl_type::error_type
;
397 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
399 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
400 * (|). The operands must be of type signed or unsigned integers or
403 if (!type_a
->is_integer()) {
404 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
405 ast_expression::operator_string(op
));
406 return glsl_type::error_type
;
408 if (!type_b
->is_integer()) {
409 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
410 ast_expression::operator_string(op
));
411 return glsl_type::error_type
;
414 /* "The fundamental types of the operands (signed or unsigned) must
417 if (type_a
->base_type
!= type_b
->base_type
) {
418 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
419 "base type", ast_expression::operator_string(op
));
420 return glsl_type::error_type
;
423 /* "The operands cannot be vectors of differing size." */
424 if (type_a
->is_vector() &&
425 type_b
->is_vector() &&
426 type_a
->vector_elements
!= type_b
->vector_elements
) {
427 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
428 "different sizes", ast_expression::operator_string(op
));
429 return glsl_type::error_type
;
432 /* "If one operand is a scalar and the other a vector, the scalar is
433 * applied component-wise to the vector, resulting in the same type as
434 * the vector. The fundamental types of the operands [...] will be the
435 * resulting fundamental type."
437 if (type_a
->is_scalar())
443 static const struct glsl_type
*
444 modulus_result_type(const struct glsl_type
*type_a
,
445 const struct glsl_type
*type_b
,
446 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
448 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
449 return glsl_type::error_type
;
452 /* From GLSL 1.50 spec, page 56:
453 * "The operator modulus (%) operates on signed or unsigned integers or
454 * integer vectors. The operand types must both be signed or both be
457 if (!type_a
->is_integer()) {
458 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
459 return glsl_type::error_type
;
461 if (!type_b
->is_integer()) {
462 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
463 return glsl_type::error_type
;
465 if (type_a
->base_type
!= type_b
->base_type
) {
466 _mesa_glsl_error(loc
, state
,
467 "operands of %% must have the same base type");
468 return glsl_type::error_type
;
471 /* "The operands cannot be vectors of differing size. If one operand is
472 * a scalar and the other vector, then the scalar is applied component-
473 * wise to the vector, resulting in the same type as the vector. If both
474 * are vectors of the same size, the result is computed component-wise."
476 if (type_a
->is_vector()) {
477 if (!type_b
->is_vector()
478 || (type_a
->vector_elements
== type_b
->vector_elements
))
483 /* "The operator modulus (%) is not defined for any other data types
484 * (non-integer types)."
486 _mesa_glsl_error(loc
, state
, "type mismatch");
487 return glsl_type::error_type
;
491 static const struct glsl_type
*
492 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
493 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
495 const glsl_type
*type_a
= value_a
->type
;
496 const glsl_type
*type_b
= value_b
->type
;
498 /* From GLSL 1.50 spec, page 56:
499 * "The relational operators greater than (>), less than (<), greater
500 * than or equal (>=), and less than or equal (<=) operate only on
501 * scalar integer and scalar floating-point expressions."
503 if (!type_a
->is_numeric()
504 || !type_b
->is_numeric()
505 || !type_a
->is_scalar()
506 || !type_b
->is_scalar()) {
507 _mesa_glsl_error(loc
, state
,
508 "Operands to relational operators must be scalar and "
510 return glsl_type::error_type
;
513 /* "Either the operands' types must match, or the conversions from
514 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
515 * operand, after which the types must match."
517 if (!apply_implicit_conversion(type_a
, value_b
, state
)
518 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
519 _mesa_glsl_error(loc
, state
,
520 "Could not implicitly convert operands to "
521 "relational operator");
522 return glsl_type::error_type
;
524 type_a
= value_a
->type
;
525 type_b
= value_b
->type
;
527 if (type_a
->base_type
!= type_b
->base_type
) {
528 _mesa_glsl_error(loc
, state
, "base type mismatch");
529 return glsl_type::error_type
;
532 /* "The result is scalar Boolean."
534 return glsl_type::bool_type
;
538 * \brief Return the result type of a bit-shift operation.
540 * If the given types to the bit-shift operator are invalid, return
541 * glsl_type::error_type.
543 * \param type_a Type of LHS of bit-shift op
544 * \param type_b Type of RHS of bit-shift op
546 static const struct glsl_type
*
547 shift_result_type(const struct glsl_type
*type_a
,
548 const struct glsl_type
*type_b
,
550 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
552 if (!state
->check_bitwise_operations_allowed(loc
)) {
553 return glsl_type::error_type
;
556 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
558 * "The shift operators (<<) and (>>). For both operators, the operands
559 * must be signed or unsigned integers or integer vectors. One operand
560 * can be signed while the other is unsigned."
562 if (!type_a
->is_integer()) {
563 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
564 "integer vector", ast_expression::operator_string(op
));
565 return glsl_type::error_type
;
568 if (!type_b
->is_integer()) {
569 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
570 "integer vector", ast_expression::operator_string(op
));
571 return glsl_type::error_type
;
574 /* "If the first operand is a scalar, the second operand has to be
577 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
578 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
579 "second must be scalar as well",
580 ast_expression::operator_string(op
));
581 return glsl_type::error_type
;
584 /* If both operands are vectors, check that they have same number of
587 if (type_a
->is_vector() &&
588 type_b
->is_vector() &&
589 type_a
->vector_elements
!= type_b
->vector_elements
) {
590 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
591 "have same number of elements",
592 ast_expression::operator_string(op
));
593 return glsl_type::error_type
;
596 /* "In all cases, the resulting type will be the same type as the left
603 * Validates that a value can be assigned to a location with a specified type
605 * Validates that \c rhs can be assigned to some location. If the types are
606 * not an exact match but an automatic conversion is possible, \c rhs will be
610 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
611 * Otherwise the actual RHS to be assigned will be returned. This may be
612 * \c rhs, or it may be \c rhs after some type conversion.
615 * In addition to being used for assignments, this function is used to
616 * type-check return values.
619 validate_assignment(struct _mesa_glsl_parse_state
*state
,
620 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
623 /* If there is already some error in the RHS, just return it. Anything
624 * else will lead to an avalanche of error message back to the user.
626 if (rhs
->type
->is_error())
629 /* If the types are identical, the assignment can trivially proceed.
631 if (rhs
->type
== lhs_type
)
634 /* If the array element types are the same and the size of the LHS is zero,
635 * the assignment is okay for initializers embedded in variable
638 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
639 * is handled by ir_dereference::is_lvalue.
641 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
642 && (lhs_type
->element_type() == rhs
->type
->element_type())
643 && (lhs_type
->array_size() == 0)) {
647 /* Check for implicit conversion in GLSL 1.20 */
648 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
649 if (rhs
->type
== lhs_type
)
657 mark_whole_array_access(ir_rvalue
*access
)
659 ir_dereference_variable
*deref
= access
->as_dereference_variable();
661 if (deref
&& deref
->var
) {
662 deref
->var
->max_array_access
= deref
->type
->length
- 1;
667 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
668 const char *non_lvalue_description
,
669 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
673 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
675 ir_variable
*lhs_var
= lhs
->variable_referenced();
677 lhs_var
->assigned
= true;
679 if (!error_emitted
) {
680 if (non_lvalue_description
!= NULL
) {
681 _mesa_glsl_error(&lhs_loc
, state
,
683 non_lvalue_description
);
684 error_emitted
= true;
685 } else if (lhs
->variable_referenced() != NULL
686 && lhs
->variable_referenced()->read_only
) {
687 _mesa_glsl_error(&lhs_loc
, state
,
688 "assignment to read-only variable '%s'",
689 lhs
->variable_referenced()->name
);
690 error_emitted
= true;
692 } else if (lhs
->type
->is_array() &&
693 !state
->check_version(120, 300, &lhs_loc
,
694 "whole array assignment forbidden")) {
695 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
697 * "Other binary or unary expressions, non-dereferenced
698 * arrays, function names, swizzles with repeated fields,
699 * and constants cannot be l-values."
701 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
703 error_emitted
= true;
704 } else if (!lhs
->is_lvalue()) {
705 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
706 error_emitted
= true;
711 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
712 if (new_rhs
== NULL
) {
713 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
717 /* If the LHS array was not declared with a size, it takes it size from
718 * the RHS. If the LHS is an l-value and a whole array, it must be a
719 * dereference of a variable. Any other case would require that the LHS
720 * is either not an l-value or not a whole array.
722 if (lhs
->type
->array_size() == 0) {
723 ir_dereference
*const d
= lhs
->as_dereference();
727 ir_variable
*const var
= d
->variable_referenced();
731 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
732 /* FINISHME: This should actually log the location of the RHS. */
733 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
735 var
->max_array_access
);
738 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
739 rhs
->type
->array_size());
742 mark_whole_array_access(rhs
);
743 mark_whole_array_access(lhs
);
746 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
747 * but not post_inc) need the converted assigned value as an rvalue
748 * to handle things like:
752 * So we always just store the computed value being assigned to a
753 * temporary and return a deref of that temporary. If the rvalue
754 * ends up not being used, the temp will get copy-propagated out.
756 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
758 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
759 instructions
->push_tail(var
);
760 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
761 deref_var
= new(ctx
) ir_dereference_variable(var
);
764 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
766 return new(ctx
) ir_dereference_variable(var
);
770 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
772 void *ctx
= ralloc_parent(lvalue
);
775 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
777 instructions
->push_tail(var
);
778 var
->mode
= ir_var_auto
;
780 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
783 return new(ctx
) ir_dereference_variable(var
);
788 ast_node::hir(exec_list
*instructions
,
789 struct _mesa_glsl_parse_state
*state
)
798 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
801 ir_rvalue
*cmp
= NULL
;
803 if (operation
== ir_binop_all_equal
)
804 join_op
= ir_binop_logic_and
;
806 join_op
= ir_binop_logic_or
;
808 switch (op0
->type
->base_type
) {
809 case GLSL_TYPE_FLOAT
:
813 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
815 case GLSL_TYPE_ARRAY
: {
816 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
817 ir_rvalue
*e0
, *e1
, *result
;
819 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
820 new(mem_ctx
) ir_constant(i
));
821 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
822 new(mem_ctx
) ir_constant(i
));
823 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
826 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
832 mark_whole_array_access(op0
);
833 mark_whole_array_access(op1
);
837 case GLSL_TYPE_STRUCT
: {
838 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
839 ir_rvalue
*e0
, *e1
, *result
;
840 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
842 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
844 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
846 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
849 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
857 case GLSL_TYPE_ERROR
:
859 case GLSL_TYPE_SAMPLER
:
860 case GLSL_TYPE_INTERFACE
:
861 /* I assume a comparison of a struct containing a sampler just
862 * ignores the sampler present in the type.
868 cmp
= new(mem_ctx
) ir_constant(true);
873 /* For logical operations, we want to ensure that the operands are
874 * scalar booleans. If it isn't, emit an error and return a constant
875 * boolean to avoid triggering cascading error messages.
878 get_scalar_boolean_operand(exec_list
*instructions
,
879 struct _mesa_glsl_parse_state
*state
,
880 ast_expression
*parent_expr
,
882 const char *operand_name
,
885 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
887 ir_rvalue
*val
= expr
->hir(instructions
, state
);
889 if (val
->type
->is_boolean() && val
->type
->is_scalar())
892 if (!*error_emitted
) {
893 YYLTYPE loc
= expr
->get_location();
894 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
896 parent_expr
->operator_string(parent_expr
->oper
));
897 *error_emitted
= true;
900 return new(ctx
) ir_constant(true);
904 * If name refers to a builtin array whose maximum allowed size is less than
905 * size, report an error and return true. Otherwise return false.
908 check_builtin_array_max_size(const char *name
, unsigned size
,
909 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
911 if ((strcmp("gl_TexCoord", name
) == 0)
912 && (size
> state
->Const
.MaxTextureCoords
)) {
913 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
915 * "The size [of gl_TexCoord] can be at most
916 * gl_MaxTextureCoords."
918 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
919 "be larger than gl_MaxTextureCoords (%u)\n",
920 state
->Const
.MaxTextureCoords
);
922 } else if (strcmp("gl_ClipDistance", name
) == 0
923 && size
> state
->Const
.MaxClipPlanes
) {
924 /* From section 7.1 (Vertex Shader Special Variables) of the
927 * "The gl_ClipDistance array is predeclared as unsized and
928 * must be sized by the shader either redeclaring it with a
929 * size or indexing it only with integral constant
930 * expressions. ... The size can be at most
931 * gl_MaxClipDistances."
933 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
934 "be larger than gl_MaxClipDistances (%u)\n",
935 state
->Const
.MaxClipPlanes
);
942 * Create the constant 1, of a which is appropriate for incrementing and
943 * decrementing values of the given GLSL type. For example, if type is vec4,
944 * this creates a constant value of 1.0 having type float.
946 * If the given type is invalid for increment and decrement operators, return
947 * a floating point 1--the error will be detected later.
950 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
952 switch (type
->base_type
) {
954 return new(ctx
) ir_constant((unsigned) 1);
956 return new(ctx
) ir_constant(1);
958 case GLSL_TYPE_FLOAT
:
959 return new(ctx
) ir_constant(1.0f
);
964 ast_expression::hir(exec_list
*instructions
,
965 struct _mesa_glsl_parse_state
*state
)
968 static const int operations
[AST_NUM_OPERATORS
] = {
969 -1, /* ast_assign doesn't convert to ir_expression. */
970 -1, /* ast_plus doesn't convert to ir_expression. */
994 /* Note: The following block of expression types actually convert
995 * to multiple IR instructions.
997 ir_binop_mul
, /* ast_mul_assign */
998 ir_binop_div
, /* ast_div_assign */
999 ir_binop_mod
, /* ast_mod_assign */
1000 ir_binop_add
, /* ast_add_assign */
1001 ir_binop_sub
, /* ast_sub_assign */
1002 ir_binop_lshift
, /* ast_ls_assign */
1003 ir_binop_rshift
, /* ast_rs_assign */
1004 ir_binop_bit_and
, /* ast_and_assign */
1005 ir_binop_bit_xor
, /* ast_xor_assign */
1006 ir_binop_bit_or
, /* ast_or_assign */
1008 -1, /* ast_conditional doesn't convert to ir_expression. */
1009 ir_binop_add
, /* ast_pre_inc. */
1010 ir_binop_sub
, /* ast_pre_dec. */
1011 ir_binop_add
, /* ast_post_inc. */
1012 ir_binop_sub
, /* ast_post_dec. */
1013 -1, /* ast_field_selection doesn't conv to ir_expression. */
1014 -1, /* ast_array_index doesn't convert to ir_expression. */
1015 -1, /* ast_function_call doesn't conv to ir_expression. */
1016 -1, /* ast_identifier doesn't convert to ir_expression. */
1017 -1, /* ast_int_constant doesn't convert to ir_expression. */
1018 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1019 -1, /* ast_float_constant doesn't conv to ir_expression. */
1020 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1021 -1, /* ast_sequence doesn't convert to ir_expression. */
1023 ir_rvalue
*result
= NULL
;
1025 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1026 bool error_emitted
= false;
1029 loc
= this->get_location();
1031 switch (this->oper
) {
1033 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1034 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1036 result
= do_assignment(instructions
, state
,
1037 this->subexpressions
[0]->non_lvalue_description
,
1038 op
[0], op
[1], false,
1039 this->subexpressions
[0]->get_location());
1040 error_emitted
= result
->type
->is_error();
1045 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1047 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1049 error_emitted
= type
->is_error();
1055 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1057 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1059 error_emitted
= type
->is_error();
1061 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1069 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1070 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1072 type
= arithmetic_result_type(op
[0], op
[1],
1073 (this->oper
== ast_mul
),
1075 error_emitted
= type
->is_error();
1077 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1082 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1083 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1085 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1087 assert(operations
[this->oper
] == ir_binop_mod
);
1089 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1091 error_emitted
= type
->is_error();
1096 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1097 error_emitted
= true;
1100 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1101 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1102 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1104 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1106 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1113 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1114 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1116 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1118 /* The relational operators must either generate an error or result
1119 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1121 assert(type
->is_error()
1122 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1123 && type
->is_scalar()));
1125 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1127 error_emitted
= type
->is_error();
1132 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1133 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1135 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1137 * "The equality operators equal (==), and not equal (!=)
1138 * operate on all types. They result in a scalar Boolean. If
1139 * the operand types do not match, then there must be a
1140 * conversion from Section 4.1.10 "Implicit Conversions"
1141 * applied to one operand that can make them match, in which
1142 * case this conversion is done."
1144 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1145 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1146 || (op
[0]->type
!= op
[1]->type
)) {
1147 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1148 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1149 error_emitted
= true;
1150 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1151 !state
->check_version(120, 300, &loc
,
1152 "array comparisons forbidden")) {
1153 error_emitted
= true;
1156 if (error_emitted
) {
1157 result
= new(ctx
) ir_constant(false);
1159 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1160 assert(result
->type
== glsl_type::bool_type
);
1167 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1168 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1169 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1171 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1173 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1177 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1179 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1180 error_emitted
= true;
1183 if (!op
[0]->type
->is_integer()) {
1184 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1185 error_emitted
= true;
1188 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1189 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1192 case ast_logic_and
: {
1193 exec_list rhs_instructions
;
1194 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1195 "LHS", &error_emitted
);
1196 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1197 "RHS", &error_emitted
);
1199 if (rhs_instructions
.is_empty()) {
1200 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1201 type
= result
->type
;
1203 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1206 instructions
->push_tail(tmp
);
1208 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1209 instructions
->push_tail(stmt
);
1211 stmt
->then_instructions
.append_list(&rhs_instructions
);
1212 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1213 ir_assignment
*const then_assign
=
1214 new(ctx
) ir_assignment(then_deref
, op
[1]);
1215 stmt
->then_instructions
.push_tail(then_assign
);
1217 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1218 ir_assignment
*const else_assign
=
1219 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1220 stmt
->else_instructions
.push_tail(else_assign
);
1222 result
= new(ctx
) ir_dereference_variable(tmp
);
1228 case ast_logic_or
: {
1229 exec_list rhs_instructions
;
1230 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1231 "LHS", &error_emitted
);
1232 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1233 "RHS", &error_emitted
);
1235 if (rhs_instructions
.is_empty()) {
1236 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1237 type
= result
->type
;
1239 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1242 instructions
->push_tail(tmp
);
1244 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1245 instructions
->push_tail(stmt
);
1247 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1248 ir_assignment
*const then_assign
=
1249 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1250 stmt
->then_instructions
.push_tail(then_assign
);
1252 stmt
->else_instructions
.append_list(&rhs_instructions
);
1253 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1254 ir_assignment
*const else_assign
=
1255 new(ctx
) ir_assignment(else_deref
, op
[1]);
1256 stmt
->else_instructions
.push_tail(else_assign
);
1258 result
= new(ctx
) ir_dereference_variable(tmp
);
1265 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1267 * "The logical binary operators and (&&), or ( | | ), and
1268 * exclusive or (^^). They operate only on two Boolean
1269 * expressions and result in a Boolean expression."
1271 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1273 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1276 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1281 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1282 "operand", &error_emitted
);
1284 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1288 case ast_mul_assign
:
1289 case ast_div_assign
:
1290 case ast_add_assign
:
1291 case ast_sub_assign
: {
1292 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1293 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1295 type
= arithmetic_result_type(op
[0], op
[1],
1296 (this->oper
== ast_mul_assign
),
1299 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1302 result
= do_assignment(instructions
, state
,
1303 this->subexpressions
[0]->non_lvalue_description
,
1304 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1305 this->subexpressions
[0]->get_location());
1306 error_emitted
= (op
[0]->type
->is_error());
1308 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1309 * explicitly test for this because none of the binary expression
1310 * operators allow array operands either.
1316 case ast_mod_assign
: {
1317 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1318 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1320 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1322 assert(operations
[this->oper
] == ir_binop_mod
);
1324 ir_rvalue
*temp_rhs
;
1325 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1328 result
= do_assignment(instructions
, state
,
1329 this->subexpressions
[0]->non_lvalue_description
,
1330 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1331 this->subexpressions
[0]->get_location());
1332 error_emitted
= type
->is_error();
1337 case ast_rs_assign
: {
1338 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1339 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1340 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1342 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1343 type
, op
[0], op
[1]);
1344 result
= do_assignment(instructions
, state
,
1345 this->subexpressions
[0]->non_lvalue_description
,
1346 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1347 this->subexpressions
[0]->get_location());
1348 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1352 case ast_and_assign
:
1353 case ast_xor_assign
:
1354 case ast_or_assign
: {
1355 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1356 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1357 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1359 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1360 type
, op
[0], op
[1]);
1361 result
= do_assignment(instructions
, state
,
1362 this->subexpressions
[0]->non_lvalue_description
,
1363 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1364 this->subexpressions
[0]->get_location());
1365 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1369 case ast_conditional
: {
1370 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1372 * "The ternary selection operator (?:). It operates on three
1373 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1374 * first expression, which must result in a scalar Boolean."
1376 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1377 "condition", &error_emitted
);
1379 /* The :? operator is implemented by generating an anonymous temporary
1380 * followed by an if-statement. The last instruction in each branch of
1381 * the if-statement assigns a value to the anonymous temporary. This
1382 * temporary is the r-value of the expression.
1384 exec_list then_instructions
;
1385 exec_list else_instructions
;
1387 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1388 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1390 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1392 * "The second and third expressions can be any type, as
1393 * long their types match, or there is a conversion in
1394 * Section 4.1.10 "Implicit Conversions" that can be applied
1395 * to one of the expressions to make their types match. This
1396 * resulting matching type is the type of the entire
1399 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1400 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1401 || (op
[1]->type
!= op
[2]->type
)) {
1402 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1404 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1405 "operator must have matching types.");
1406 error_emitted
= true;
1407 type
= glsl_type::error_type
;
1412 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1414 * "The second and third expressions must be the same type, but can
1415 * be of any type other than an array."
1417 if (type
->is_array() &&
1418 !state
->check_version(120, 300, &loc
,
1419 "Second and third operands of ?: operator "
1420 "cannot be arrays")) {
1421 error_emitted
= true;
1424 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1425 ir_constant
*then_val
= op
[1]->constant_expression_value();
1426 ir_constant
*else_val
= op
[2]->constant_expression_value();
1428 if (then_instructions
.is_empty()
1429 && else_instructions
.is_empty()
1430 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1431 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1433 ir_variable
*const tmp
=
1434 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1435 instructions
->push_tail(tmp
);
1437 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1438 instructions
->push_tail(stmt
);
1440 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1441 ir_dereference
*const then_deref
=
1442 new(ctx
) ir_dereference_variable(tmp
);
1443 ir_assignment
*const then_assign
=
1444 new(ctx
) ir_assignment(then_deref
, op
[1]);
1445 stmt
->then_instructions
.push_tail(then_assign
);
1447 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1448 ir_dereference
*const else_deref
=
1449 new(ctx
) ir_dereference_variable(tmp
);
1450 ir_assignment
*const else_assign
=
1451 new(ctx
) ir_assignment(else_deref
, op
[2]);
1452 stmt
->else_instructions
.push_tail(else_assign
);
1454 result
= new(ctx
) ir_dereference_variable(tmp
);
1461 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1462 ? "pre-increment operation" : "pre-decrement operation";
1464 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1465 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1467 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1469 ir_rvalue
*temp_rhs
;
1470 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1473 result
= do_assignment(instructions
, state
,
1474 this->subexpressions
[0]->non_lvalue_description
,
1475 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1476 this->subexpressions
[0]->get_location());
1477 error_emitted
= op
[0]->type
->is_error();
1482 case ast_post_dec
: {
1483 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1484 ? "post-increment operation" : "post-decrement operation";
1485 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1486 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1488 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1490 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1492 ir_rvalue
*temp_rhs
;
1493 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1496 /* Get a temporary of a copy of the lvalue before it's modified.
1497 * This may get thrown away later.
1499 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1501 (void)do_assignment(instructions
, state
,
1502 this->subexpressions
[0]->non_lvalue_description
,
1503 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1504 this->subexpressions
[0]->get_location());
1506 error_emitted
= op
[0]->type
->is_error();
1510 case ast_field_selection
:
1511 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1514 case ast_array_index
: {
1515 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1517 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1518 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1520 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1522 ir_rvalue
*const array
= op
[0];
1524 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1526 /* Do not use op[0] after this point. Use array.
1534 if (!array
->type
->is_array()
1535 && !array
->type
->is_matrix()
1536 && !array
->type
->is_vector()) {
1537 _mesa_glsl_error(& index_loc
, state
,
1538 "cannot dereference non-array / non-matrix / "
1540 error_emitted
= true;
1543 if (!op
[1]->type
->is_integer()) {
1544 _mesa_glsl_error(& index_loc
, state
,
1545 "array index must be integer type");
1546 error_emitted
= true;
1547 } else if (!op
[1]->type
->is_scalar()) {
1548 _mesa_glsl_error(& index_loc
, state
,
1549 "array index must be scalar");
1550 error_emitted
= true;
1553 /* If the array index is a constant expression and the array has a
1554 * declared size, ensure that the access is in-bounds. If the array
1555 * index is not a constant expression, ensure that the array has a
1558 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1559 if (const_index
!= NULL
) {
1560 const int idx
= const_index
->value
.i
[0];
1561 const char *type_name
;
1564 if (array
->type
->is_matrix()) {
1565 type_name
= "matrix";
1566 } else if (array
->type
->is_vector()) {
1567 type_name
= "vector";
1569 type_name
= "array";
1572 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1574 * "It is illegal to declare an array with a size, and then
1575 * later (in the same shader) index the same array with an
1576 * integral constant expression greater than or equal to the
1577 * declared size. It is also illegal to index an array with a
1578 * negative constant expression."
1580 if (array
->type
->is_matrix()) {
1581 if (array
->type
->row_type()->vector_elements
<= idx
) {
1582 bound
= array
->type
->row_type()->vector_elements
;
1584 } else if (array
->type
->is_vector()) {
1585 if (array
->type
->vector_elements
<= idx
) {
1586 bound
= array
->type
->vector_elements
;
1589 if ((array
->type
->array_size() > 0)
1590 && (array
->type
->array_size() <= idx
)) {
1591 bound
= array
->type
->array_size();
1596 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1598 error_emitted
= true;
1599 } else if (idx
< 0) {
1600 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1602 error_emitted
= true;
1605 if (array
->type
->is_array()) {
1606 /* If the array is a variable dereference, it dereferences the
1607 * whole array, by definition. Use this to get the variable.
1609 * FINISHME: Should some methods for getting / setting / testing
1610 * FINISHME: array access limits be added to ir_dereference?
1612 ir_variable
*const v
= array
->whole_variable_referenced();
1613 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
)) {
1614 v
->max_array_access
= idx
;
1616 /* Check whether this access will, as a side effect, implicitly
1617 * cause the size of a built-in array to be too large.
1619 if (check_builtin_array_max_size(v
->name
, idx
+1, loc
, state
))
1620 error_emitted
= true;
1623 } else if (array
->type
->array_size() == 0) {
1624 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1625 } else if (array
->type
->is_array()
1626 && array
->type
->fields
.array
->is_interface()) {
1627 /* Page 46 in section 4.3.7 of the OpenGL ES 3.00 spec says:
1629 * "All indexes used to index a uniform block array must be
1630 * constant integral expressions."
1632 _mesa_glsl_error(&loc
, state
,
1633 "uniform block array index must be constant");
1635 if (array
->type
->is_array()) {
1636 /* whole_variable_referenced can return NULL if the array is a
1637 * member of a structure. In this case it is safe to not update
1638 * the max_array_access field because it is never used for fields
1641 ir_variable
*v
= array
->whole_variable_referenced();
1643 v
->max_array_access
= array
->type
->array_size() - 1;
1647 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1649 * "Samplers aggregated into arrays within a shader (using square
1650 * brackets [ ]) can only be indexed with integral constant
1651 * expressions [...]."
1653 * This restriction was added in GLSL 1.30. Shaders using earlier version
1654 * of the language should not be rejected by the compiler front-end for
1655 * using this construct. This allows useful things such as using a loop
1656 * counter as the index to an array of samplers. If the loop in unrolled,
1657 * the code should compile correctly. Instead, emit a warning.
1659 if (array
->type
->is_array() &&
1660 array
->type
->element_type()->is_sampler() &&
1661 const_index
== NULL
) {
1663 if (!state
->is_version(130, 100)) {
1664 if (state
->es_shader
) {
1665 _mesa_glsl_warning(&loc
, state
,
1666 "sampler arrays indexed with non-constant "
1667 "expressions is optional in %s",
1668 state
->get_version_string());
1670 _mesa_glsl_warning(&loc
, state
,
1671 "sampler arrays indexed with non-constant "
1672 "expressions will be forbidden in GLSL 1.30 and "
1676 _mesa_glsl_error(&loc
, state
,
1677 "sampler arrays indexed with non-constant "
1678 "expressions is forbidden in GLSL 1.30 and "
1680 error_emitted
= true;
1685 result
->type
= glsl_type::error_type
;
1690 case ast_function_call
:
1691 /* Should *NEVER* get here. ast_function_call should always be handled
1692 * by ast_function_expression::hir.
1697 case ast_identifier
: {
1698 /* ast_identifier can appear several places in a full abstract syntax
1699 * tree. This particular use must be at location specified in the grammar
1700 * as 'variable_identifier'.
1703 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1707 result
= new(ctx
) ir_dereference_variable(var
);
1709 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1710 this->primary_expression
.identifier
);
1712 result
= ir_rvalue::error_value(ctx
);
1713 error_emitted
= true;
1718 case ast_int_constant
:
1719 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1722 case ast_uint_constant
:
1723 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1726 case ast_float_constant
:
1727 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1730 case ast_bool_constant
:
1731 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1734 case ast_sequence
: {
1735 /* It should not be possible to generate a sequence in the AST without
1736 * any expressions in it.
1738 assert(!this->expressions
.is_empty());
1740 /* The r-value of a sequence is the last expression in the sequence. If
1741 * the other expressions in the sequence do not have side-effects (and
1742 * therefore add instructions to the instruction list), they get dropped
1745 exec_node
*previous_tail_pred
= NULL
;
1746 YYLTYPE previous_operand_loc
= loc
;
1748 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1749 /* If one of the operands of comma operator does not generate any
1750 * code, we want to emit a warning. At each pass through the loop
1751 * previous_tail_pred will point to the last instruction in the
1752 * stream *before* processing the previous operand. Naturally,
1753 * instructions->tail_pred will point to the last instruction in the
1754 * stream *after* processing the previous operand. If the two
1755 * pointers match, then the previous operand had no effect.
1757 * The warning behavior here differs slightly from GCC. GCC will
1758 * only emit a warning if none of the left-hand operands have an
1759 * effect. However, it will emit a warning for each. I believe that
1760 * there are some cases in C (especially with GCC extensions) where
1761 * it is useful to have an intermediate step in a sequence have no
1762 * effect, but I don't think these cases exist in GLSL. Either way,
1763 * it would be a giant hassle to replicate that behavior.
1765 if (previous_tail_pred
== instructions
->tail_pred
) {
1766 _mesa_glsl_warning(&previous_operand_loc
, state
,
1767 "left-hand operand of comma expression has "
1771 /* tail_pred is directly accessed instead of using the get_tail()
1772 * method for performance reasons. get_tail() has extra code to
1773 * return NULL when the list is empty. We don't care about that
1774 * here, so using tail_pred directly is fine.
1776 previous_tail_pred
= instructions
->tail_pred
;
1777 previous_operand_loc
= ast
->get_location();
1779 result
= ast
->hir(instructions
, state
);
1782 /* Any errors should have already been emitted in the loop above.
1784 error_emitted
= true;
1788 type
= NULL
; /* use result->type, not type. */
1789 assert(result
!= NULL
);
1791 if (result
->type
->is_error() && !error_emitted
)
1792 _mesa_glsl_error(& loc
, state
, "type mismatch");
1799 ast_expression_statement::hir(exec_list
*instructions
,
1800 struct _mesa_glsl_parse_state
*state
)
1802 /* It is possible to have expression statements that don't have an
1803 * expression. This is the solitary semicolon:
1805 * for (i = 0; i < 5; i++)
1808 * In this case the expression will be NULL. Test for NULL and don't do
1809 * anything in that case.
1811 if (expression
!= NULL
)
1812 expression
->hir(instructions
, state
);
1814 /* Statements do not have r-values.
1821 ast_compound_statement::hir(exec_list
*instructions
,
1822 struct _mesa_glsl_parse_state
*state
)
1825 state
->symbols
->push_scope();
1827 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1828 ast
->hir(instructions
, state
);
1831 state
->symbols
->pop_scope();
1833 /* Compound statements do not have r-values.
1839 static const glsl_type
*
1840 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1841 struct _mesa_glsl_parse_state
*state
)
1843 unsigned length
= 0;
1845 /* From page 19 (page 25) of the GLSL 1.20 spec:
1847 * "Only one-dimensional arrays may be declared."
1849 if (base
->is_array()) {
1850 _mesa_glsl_error(loc
, state
,
1851 "invalid array of `%s' (only one-dimensional arrays "
1854 return glsl_type::error_type
;
1857 if (array_size
!= NULL
) {
1858 exec_list dummy_instructions
;
1859 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1860 YYLTYPE loc
= array_size
->get_location();
1863 if (!ir
->type
->is_integer()) {
1864 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1865 } else if (!ir
->type
->is_scalar()) {
1866 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1868 ir_constant
*const size
= ir
->constant_expression_value();
1871 _mesa_glsl_error(& loc
, state
, "array size must be a "
1872 "constant valued expression");
1873 } else if (size
->value
.i
[0] <= 0) {
1874 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1876 assert(size
->type
== ir
->type
);
1877 length
= size
->value
.u
[0];
1879 /* If the array size is const (and we've verified that
1880 * it is) then no instructions should have been emitted
1881 * when we converted it to HIR. If they were emitted,
1882 * then either the array size isn't const after all, or
1883 * we are emitting unnecessary instructions.
1885 assert(dummy_instructions
.is_empty());
1889 } else if (state
->es_shader
) {
1890 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1891 * array declarations have been removed from the language.
1893 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1894 "allowed in GLSL ES 1.00.");
1897 return glsl_type::get_array_instance(base
, length
);
1902 ast_type_specifier::glsl_type(const char **name
,
1903 struct _mesa_glsl_parse_state
*state
) const
1905 const struct glsl_type
*type
;
1907 type
= state
->symbols
->get_type(this->type_name
);
1908 *name
= this->type_name
;
1910 if (this->is_array
) {
1911 YYLTYPE loc
= this->get_location();
1912 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1920 * Determine whether a toplevel variable declaration declares a varying. This
1921 * function operates by examining the variable's mode and the shader target,
1922 * so it correctly identifies linkage variables regardless of whether they are
1923 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1925 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1926 * this function will produce undefined results.
1929 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1933 return var
->mode
== ir_var_shader_out
;
1934 case fragment_shader
:
1935 return var
->mode
== ir_var_shader_in
;
1937 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1943 * Matrix layout qualifiers are only allowed on certain types
1946 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1948 const glsl_type
*type
)
1950 if (!type
->is_matrix() && !type
->is_record()) {
1951 _mesa_glsl_error(loc
, state
,
1952 "uniform block layout qualifiers row_major and "
1953 "column_major can only be applied to matrix and "
1955 } else if (type
->is_record()) {
1956 /* We allow 'layout(row_major)' on structure types because it's the only
1957 * way to get row-major layouts on matrices contained in structures.
1959 _mesa_glsl_warning(loc
, state
,
1960 "uniform block layout qualifiers row_major and "
1961 "column_major applied to structure types is not "
1962 "strictly conformant and my be rejected by other "
1968 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1970 struct _mesa_glsl_parse_state
*state
,
1972 bool ubo_qualifiers_valid
,
1975 if (qual
->flags
.q
.invariant
) {
1977 _mesa_glsl_error(loc
, state
,
1978 "variable `%s' may not be redeclared "
1979 "`invariant' after being used",
1986 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1987 || qual
->flags
.q
.uniform
1988 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1991 if (qual
->flags
.q
.centroid
)
1994 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1995 var
->type
= glsl_type::error_type
;
1996 _mesa_glsl_error(loc
, state
,
1997 "`attribute' variables may not be declared in the "
1999 _mesa_glsl_shader_target_name(state
->target
));
2002 /* If there is no qualifier that changes the mode of the variable, leave
2003 * the setting alone.
2005 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2006 var
->mode
= ir_var_function_inout
;
2007 else if (qual
->flags
.q
.in
)
2008 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2009 else if (qual
->flags
.q
.attribute
2010 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
2011 var
->mode
= ir_var_shader_in
;
2012 else if (qual
->flags
.q
.out
)
2013 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2014 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
2015 var
->mode
= ir_var_shader_out
;
2016 else if (qual
->flags
.q
.uniform
)
2017 var
->mode
= ir_var_uniform
;
2019 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
2020 /* This variable is being used to link data between shader stages (in
2021 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2022 * that is allowed for such purposes.
2024 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2026 * "The varying qualifier can be used only with the data types
2027 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2030 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2031 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2033 * "Fragment inputs can only be signed and unsigned integers and
2034 * integer vectors, float, floating-point vectors, matrices, or
2035 * arrays of these. Structures cannot be input.
2037 * Similar text exists in the section on vertex shader outputs.
2039 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2040 * 3.00 spec allows structs as well. Varying structs are also allowed
2043 switch (var
->type
->get_scalar_type()->base_type
) {
2044 case GLSL_TYPE_FLOAT
:
2045 /* Ok in all GLSL versions */
2047 case GLSL_TYPE_UINT
:
2049 if (state
->is_version(130, 300))
2051 _mesa_glsl_error(loc
, state
,
2052 "varying variables must be of base type float in %s",
2053 state
->get_version_string());
2055 case GLSL_TYPE_STRUCT
:
2056 if (state
->is_version(150, 300))
2058 _mesa_glsl_error(loc
, state
,
2059 "varying variables may not be of type struct");
2062 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2067 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2068 switch (state
->target
) {
2070 if (var
->mode
== ir_var_shader_out
)
2071 var
->invariant
= true;
2073 case geometry_shader
:
2074 if ((var
->mode
== ir_var_shader_in
)
2075 || (var
->mode
== ir_var_shader_out
))
2076 var
->invariant
= true;
2078 case fragment_shader
:
2079 if (var
->mode
== ir_var_shader_in
)
2080 var
->invariant
= true;
2085 if (qual
->flags
.q
.flat
)
2086 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2087 else if (qual
->flags
.q
.noperspective
)
2088 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2089 else if (qual
->flags
.q
.smooth
)
2090 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2092 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2094 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
2095 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
) &&
2096 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)) {
2097 _mesa_glsl_error(loc
, state
,
2098 "interpolation qualifier `%s' can only be applied to "
2099 "vertex shader outputs and fragment shader inputs.",
2100 var
->interpolation_string());
2103 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2104 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2105 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2106 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2107 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2108 ? "origin_upper_left" : "pixel_center_integer";
2110 _mesa_glsl_error(loc
, state
,
2111 "layout qualifier `%s' can only be applied to "
2112 "fragment shader input `gl_FragCoord'",
2116 if (qual
->flags
.q
.explicit_location
) {
2117 const bool global_scope
= (state
->current_function
== NULL
);
2119 const char *string
= "";
2121 /* In the vertex shader only shader inputs can be given explicit
2124 * In the fragment shader only shader outputs can be given explicit
2127 switch (state
->target
) {
2129 if (!global_scope
|| (var
->mode
!= ir_var_shader_in
)) {
2135 case geometry_shader
:
2136 _mesa_glsl_error(loc
, state
,
2137 "geometry shader variables cannot be given "
2138 "explicit locations\n");
2141 case fragment_shader
:
2142 if (!global_scope
|| (var
->mode
!= ir_var_shader_out
)) {
2150 _mesa_glsl_error(loc
, state
,
2151 "only %s shader %s variables can be given an "
2152 "explicit location\n",
2153 _mesa_glsl_shader_target_name(state
->target
),
2156 var
->explicit_location
= true;
2158 /* This bit of silliness is needed because invalid explicit locations
2159 * are supposed to be flagged during linking. Small negative values
2160 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2161 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2162 * The linker needs to be able to differentiate these cases. This
2163 * ensures that negative values stay negative.
2165 if (qual
->location
>= 0) {
2166 var
->location
= (state
->target
== vertex_shader
)
2167 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2168 : (qual
->location
+ FRAG_RESULT_DATA0
);
2170 var
->location
= qual
->location
;
2173 if (qual
->flags
.q
.explicit_index
) {
2174 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2175 * Layout Qualifiers):
2177 * "It is also a compile-time error if a fragment shader
2178 * sets a layout index to less than 0 or greater than 1."
2180 * Older specifications don't mandate a behavior; we take
2181 * this as a clarification and always generate the error.
2183 if (qual
->index
< 0 || qual
->index
> 1) {
2184 _mesa_glsl_error(loc
, state
,
2185 "explicit index may only be 0 or 1\n");
2187 var
->explicit_index
= true;
2188 var
->index
= qual
->index
;
2192 } else if (qual
->flags
.q
.explicit_index
) {
2193 _mesa_glsl_error(loc
, state
,
2194 "explicit index requires explicit location\n");
2197 /* Does the declaration use the 'layout' keyword?
2199 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2200 || qual
->flags
.q
.origin_upper_left
2201 || qual
->flags
.q
.explicit_location
; /* no need for index since it relies on location */
2203 /* Does the declaration use the deprecated 'attribute' or 'varying'
2206 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2207 || qual
->flags
.q
.varying
;
2209 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2210 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2211 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2212 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2213 * These extensions and all following extensions that add the 'layout'
2214 * keyword have been modified to require the use of 'in' or 'out'.
2216 * The following extension do not allow the deprecated keywords:
2218 * GL_AMD_conservative_depth
2219 * GL_ARB_conservative_depth
2220 * GL_ARB_gpu_shader5
2221 * GL_ARB_separate_shader_objects
2222 * GL_ARB_tesselation_shader
2223 * GL_ARB_transform_feedback3
2224 * GL_ARB_uniform_buffer_object
2226 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2227 * allow layout with the deprecated keywords.
2229 const bool relaxed_layout_qualifier_checking
=
2230 state
->ARB_fragment_coord_conventions_enable
;
2232 if (uses_layout
&& uses_deprecated_qualifier
) {
2233 if (relaxed_layout_qualifier_checking
) {
2234 _mesa_glsl_warning(loc
, state
,
2235 "`layout' qualifier may not be used with "
2236 "`attribute' or `varying'");
2238 _mesa_glsl_error(loc
, state
,
2239 "`layout' qualifier may not be used with "
2240 "`attribute' or `varying'");
2244 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2245 * AMD_conservative_depth.
2247 int depth_layout_count
= qual
->flags
.q
.depth_any
2248 + qual
->flags
.q
.depth_greater
2249 + qual
->flags
.q
.depth_less
2250 + qual
->flags
.q
.depth_unchanged
;
2251 if (depth_layout_count
> 0
2252 && !state
->AMD_conservative_depth_enable
2253 && !state
->ARB_conservative_depth_enable
) {
2254 _mesa_glsl_error(loc
, state
,
2255 "extension GL_AMD_conservative_depth or "
2256 "GL_ARB_conservative_depth must be enabled "
2257 "to use depth layout qualifiers");
2258 } else if (depth_layout_count
> 0
2259 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2260 _mesa_glsl_error(loc
, state
,
2261 "depth layout qualifiers can be applied only to "
2263 } else if (depth_layout_count
> 1
2264 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2265 _mesa_glsl_error(loc
, state
,
2266 "at most one depth layout qualifier can be applied to "
2269 if (qual
->flags
.q
.depth_any
)
2270 var
->depth_layout
= ir_depth_layout_any
;
2271 else if (qual
->flags
.q
.depth_greater
)
2272 var
->depth_layout
= ir_depth_layout_greater
;
2273 else if (qual
->flags
.q
.depth_less
)
2274 var
->depth_layout
= ir_depth_layout_less
;
2275 else if (qual
->flags
.q
.depth_unchanged
)
2276 var
->depth_layout
= ir_depth_layout_unchanged
;
2278 var
->depth_layout
= ir_depth_layout_none
;
2280 if (qual
->flags
.q
.std140
||
2281 qual
->flags
.q
.packed
||
2282 qual
->flags
.q
.shared
) {
2283 _mesa_glsl_error(loc
, state
,
2284 "uniform block layout qualifiers std140, packed, and "
2285 "shared can only be applied to uniform blocks, not "
2289 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2290 if (!ubo_qualifiers_valid
) {
2291 _mesa_glsl_error(loc
, state
,
2292 "uniform block layout qualifiers row_major and "
2293 "column_major can only be applied to uniform block "
2296 validate_matrix_layout_for_type(state
, loc
, var
->type
);
2301 * Get the variable that is being redeclared by this declaration
2303 * Semantic checks to verify the validity of the redeclaration are also
2304 * performed. If semantic checks fail, compilation error will be emitted via
2305 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2308 * A pointer to an existing variable in the current scope if the declaration
2309 * is a redeclaration, \c NULL otherwise.
2312 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2313 struct _mesa_glsl_parse_state
*state
)
2315 /* Check if this declaration is actually a re-declaration, either to
2316 * resize an array or add qualifiers to an existing variable.
2318 * This is allowed for variables in the current scope, or when at
2319 * global scope (for built-ins in the implicit outer scope).
2321 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2322 if (earlier
== NULL
||
2323 (state
->current_function
!= NULL
&&
2324 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2329 YYLTYPE loc
= decl
->get_location();
2331 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2333 * "It is legal to declare an array without a size and then
2334 * later re-declare the same name as an array of the same
2335 * type and specify a size."
2337 if ((earlier
->type
->array_size() == 0)
2338 && var
->type
->is_array()
2339 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2340 /* FINISHME: This doesn't match the qualifiers on the two
2341 * FINISHME: declarations. It's not 100% clear whether this is
2342 * FINISHME: required or not.
2345 const unsigned size
= unsigned(var
->type
->array_size());
2346 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2347 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2348 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2350 earlier
->max_array_access
);
2353 earlier
->type
= var
->type
;
2356 } else if (state
->ARB_fragment_coord_conventions_enable
2357 && strcmp(var
->name
, "gl_FragCoord") == 0
2358 && earlier
->type
== var
->type
2359 && earlier
->mode
== var
->mode
) {
2360 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2363 earlier
->origin_upper_left
= var
->origin_upper_left
;
2364 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2366 /* According to section 4.3.7 of the GLSL 1.30 spec,
2367 * the following built-in varaibles can be redeclared with an
2368 * interpolation qualifier:
2371 * * gl_FrontSecondaryColor
2372 * * gl_BackSecondaryColor
2374 * * gl_SecondaryColor
2376 } else if (state
->is_version(130, 0)
2377 && (strcmp(var
->name
, "gl_FrontColor") == 0
2378 || strcmp(var
->name
, "gl_BackColor") == 0
2379 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2380 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2381 || strcmp(var
->name
, "gl_Color") == 0
2382 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2383 && earlier
->type
== var
->type
2384 && earlier
->mode
== var
->mode
) {
2385 earlier
->interpolation
= var
->interpolation
;
2387 /* Layout qualifiers for gl_FragDepth. */
2388 } else if ((state
->AMD_conservative_depth_enable
||
2389 state
->ARB_conservative_depth_enable
)
2390 && strcmp(var
->name
, "gl_FragDepth") == 0
2391 && earlier
->type
== var
->type
2392 && earlier
->mode
== var
->mode
) {
2394 /** From the AMD_conservative_depth spec:
2395 * Within any shader, the first redeclarations of gl_FragDepth
2396 * must appear before any use of gl_FragDepth.
2398 if (earlier
->used
) {
2399 _mesa_glsl_error(&loc
, state
,
2400 "the first redeclaration of gl_FragDepth "
2401 "must appear before any use of gl_FragDepth");
2404 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2405 if (earlier
->depth_layout
!= ir_depth_layout_none
2406 && earlier
->depth_layout
!= var
->depth_layout
) {
2407 _mesa_glsl_error(&loc
, state
,
2408 "gl_FragDepth: depth layout is declared here "
2409 "as '%s, but it was previously declared as "
2411 depth_layout_string(var
->depth_layout
),
2412 depth_layout_string(earlier
->depth_layout
));
2415 earlier
->depth_layout
= var
->depth_layout
;
2418 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2425 * Generate the IR for an initializer in a variable declaration
2428 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2429 ast_fully_specified_type
*type
,
2430 exec_list
*initializer_instructions
,
2431 struct _mesa_glsl_parse_state
*state
)
2433 ir_rvalue
*result
= NULL
;
2435 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2437 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2439 * "All uniform variables are read-only and are initialized either
2440 * directly by an application via API commands, or indirectly by
2443 if (var
->mode
== ir_var_uniform
) {
2444 state
->check_version(120, 0, &initializer_loc
,
2445 "cannot initialize uniforms");
2448 if (var
->type
->is_sampler()) {
2449 _mesa_glsl_error(& initializer_loc
, state
,
2450 "cannot initialize samplers");
2453 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2454 _mesa_glsl_error(& initializer_loc
, state
,
2455 "cannot initialize %s shader input / %s",
2456 _mesa_glsl_shader_target_name(state
->target
),
2457 (state
->target
== vertex_shader
)
2458 ? "attribute" : "varying");
2461 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2462 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2465 /* Calculate the constant value if this is a const or uniform
2468 if (type
->qualifier
.flags
.q
.constant
2469 || type
->qualifier
.flags
.q
.uniform
) {
2470 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2471 if (new_rhs
!= NULL
) {
2474 ir_constant
*constant_value
= rhs
->constant_expression_value();
2475 if (!constant_value
) {
2476 _mesa_glsl_error(& initializer_loc
, state
,
2477 "initializer of %s variable `%s' must be a "
2478 "constant expression",
2479 (type
->qualifier
.flags
.q
.constant
)
2480 ? "const" : "uniform",
2482 if (var
->type
->is_numeric()) {
2483 /* Reduce cascading errors. */
2484 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2487 rhs
= constant_value
;
2488 var
->constant_value
= constant_value
;
2491 _mesa_glsl_error(&initializer_loc
, state
,
2492 "initializer of type %s cannot be assigned to "
2493 "variable of type %s",
2494 rhs
->type
->name
, var
->type
->name
);
2495 if (var
->type
->is_numeric()) {
2496 /* Reduce cascading errors. */
2497 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2502 if (rhs
&& !rhs
->type
->is_error()) {
2503 bool temp
= var
->read_only
;
2504 if (type
->qualifier
.flags
.q
.constant
)
2505 var
->read_only
= false;
2507 /* Never emit code to initialize a uniform.
2509 const glsl_type
*initializer_type
;
2510 if (!type
->qualifier
.flags
.q
.uniform
) {
2511 result
= do_assignment(initializer_instructions
, state
,
2514 type
->get_location());
2515 initializer_type
= result
->type
;
2517 initializer_type
= rhs
->type
;
2519 var
->constant_initializer
= rhs
->constant_expression_value();
2520 var
->has_initializer
= true;
2522 /* If the declared variable is an unsized array, it must inherrit
2523 * its full type from the initializer. A declaration such as
2525 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2529 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2531 * The assignment generated in the if-statement (below) will also
2532 * automatically handle this case for non-uniforms.
2534 * If the declared variable is not an array, the types must
2535 * already match exactly. As a result, the type assignment
2536 * here can be done unconditionally. For non-uniforms the call
2537 * to do_assignment can change the type of the initializer (via
2538 * the implicit conversion rules). For uniforms the initializer
2539 * must be a constant expression, and the type of that expression
2540 * was validated above.
2542 var
->type
= initializer_type
;
2544 var
->read_only
= temp
;
2551 ast_declarator_list::hir(exec_list
*instructions
,
2552 struct _mesa_glsl_parse_state
*state
)
2555 const struct glsl_type
*decl_type
;
2556 const char *type_name
= NULL
;
2557 ir_rvalue
*result
= NULL
;
2558 YYLTYPE loc
= this->get_location();
2560 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2562 * "To ensure that a particular output variable is invariant, it is
2563 * necessary to use the invariant qualifier. It can either be used to
2564 * qualify a previously declared variable as being invariant
2566 * invariant gl_Position; // make existing gl_Position be invariant"
2568 * In these cases the parser will set the 'invariant' flag in the declarator
2569 * list, and the type will be NULL.
2571 if (this->invariant
) {
2572 assert(this->type
== NULL
);
2574 if (state
->current_function
!= NULL
) {
2575 _mesa_glsl_error(& loc
, state
,
2576 "All uses of `invariant' keyword must be at global "
2580 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2581 assert(!decl
->is_array
);
2582 assert(decl
->array_size
== NULL
);
2583 assert(decl
->initializer
== NULL
);
2585 ir_variable
*const earlier
=
2586 state
->symbols
->get_variable(decl
->identifier
);
2587 if (earlier
== NULL
) {
2588 _mesa_glsl_error(& loc
, state
,
2589 "Undeclared variable `%s' cannot be marked "
2590 "invariant\n", decl
->identifier
);
2591 } else if ((state
->target
== vertex_shader
)
2592 && (earlier
->mode
!= ir_var_shader_out
)) {
2593 _mesa_glsl_error(& loc
, state
,
2594 "`%s' cannot be marked invariant, vertex shader "
2595 "outputs only\n", decl
->identifier
);
2596 } else if ((state
->target
== fragment_shader
)
2597 && (earlier
->mode
!= ir_var_shader_in
)) {
2598 _mesa_glsl_error(& loc
, state
,
2599 "`%s' cannot be marked invariant, fragment shader "
2600 "inputs only\n", decl
->identifier
);
2601 } else if (earlier
->used
) {
2602 _mesa_glsl_error(& loc
, state
,
2603 "variable `%s' may not be redeclared "
2604 "`invariant' after being used",
2607 earlier
->invariant
= true;
2611 /* Invariant redeclarations do not have r-values.
2616 assert(this->type
!= NULL
);
2617 assert(!this->invariant
);
2619 /* The type specifier may contain a structure definition. Process that
2620 * before any of the variable declarations.
2622 (void) this->type
->specifier
->hir(instructions
, state
);
2624 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2625 if (this->declarations
.is_empty()) {
2626 /* If there is no structure involved in the program text, there are two
2627 * possible scenarios:
2629 * - The program text contained something like 'vec4;'. This is an
2630 * empty declaration. It is valid but weird. Emit a warning.
2632 * - The program text contained something like 'S;' and 'S' is not the
2633 * name of a known structure type. This is both invalid and weird.
2636 * Note that if decl_type is NULL and there is a structure involved,
2637 * there must have been some sort of error with the structure. In this
2638 * case we assume that an error was already generated on this line of
2639 * code for the structure. There is no need to generate an additional,
2642 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2644 if (this->type
->specifier
->structure
== NULL
) {
2645 if (decl_type
!= NULL
) {
2646 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2648 _mesa_glsl_error(&loc
, state
,
2649 "invalid type `%s' in empty declaration",
2655 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2656 const struct glsl_type
*var_type
;
2659 /* FINISHME: Emit a warning if a variable declaration shadows a
2660 * FINISHME: declaration at a higher scope.
2663 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2664 if (type_name
!= NULL
) {
2665 _mesa_glsl_error(& loc
, state
,
2666 "invalid type `%s' in declaration of `%s'",
2667 type_name
, decl
->identifier
);
2669 _mesa_glsl_error(& loc
, state
,
2670 "invalid type in declaration of `%s'",
2676 if (decl
->is_array
) {
2677 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2679 if (var_type
->is_error())
2682 var_type
= decl_type
;
2685 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2687 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2689 * "Global variables can only use the qualifiers const,
2690 * attribute, uni form, or varying. Only one may be
2693 * Local variables can only use the qualifier const."
2695 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2696 * any extension that adds the 'layout' keyword.
2698 if (!state
->is_version(130, 300)
2699 && !state
->ARB_explicit_attrib_location_enable
2700 && !state
->ARB_fragment_coord_conventions_enable
) {
2701 if (this->type
->qualifier
.flags
.q
.out
) {
2702 _mesa_glsl_error(& loc
, state
,
2703 "`out' qualifier in declaration of `%s' "
2704 "only valid for function parameters in %s.",
2705 decl
->identifier
, state
->get_version_string());
2707 if (this->type
->qualifier
.flags
.q
.in
) {
2708 _mesa_glsl_error(& loc
, state
,
2709 "`in' qualifier in declaration of `%s' "
2710 "only valid for function parameters in %s.",
2711 decl
->identifier
, state
->get_version_string());
2713 /* FINISHME: Test for other invalid qualifiers. */
2716 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2717 & loc
, this->ubo_qualifiers_valid
, false);
2719 if (this->type
->qualifier
.flags
.q
.invariant
) {
2720 if ((state
->target
== vertex_shader
) &&
2721 var
->mode
!= ir_var_shader_out
) {
2722 _mesa_glsl_error(& loc
, state
,
2723 "`%s' cannot be marked invariant, vertex shader "
2724 "outputs only\n", var
->name
);
2725 } else if ((state
->target
== fragment_shader
) &&
2726 var
->mode
!= ir_var_shader_in
) {
2727 /* FINISHME: Note that this doesn't work for invariant on
2728 * a function signature inval
2730 _mesa_glsl_error(& loc
, state
,
2731 "`%s' cannot be marked invariant, fragment shader "
2732 "inputs only\n", var
->name
);
2736 if (state
->current_function
!= NULL
) {
2737 const char *mode
= NULL
;
2738 const char *extra
= "";
2740 /* There is no need to check for 'inout' here because the parser will
2741 * only allow that in function parameter lists.
2743 if (this->type
->qualifier
.flags
.q
.attribute
) {
2745 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2747 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2749 } else if (this->type
->qualifier
.flags
.q
.in
) {
2751 extra
= " or in function parameter list";
2752 } else if (this->type
->qualifier
.flags
.q
.out
) {
2754 extra
= " or in function parameter list";
2758 _mesa_glsl_error(& loc
, state
,
2759 "%s variable `%s' must be declared at "
2761 mode
, var
->name
, extra
);
2763 } else if (var
->mode
== ir_var_shader_in
) {
2764 var
->read_only
= true;
2766 if (state
->target
== vertex_shader
) {
2767 bool error_emitted
= false;
2769 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2771 * "Vertex shader inputs can only be float, floating-point
2772 * vectors, matrices, signed and unsigned integers and integer
2773 * vectors. Vertex shader inputs can also form arrays of these
2774 * types, but not structures."
2776 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2778 * "Vertex shader inputs can only be float, floating-point
2779 * vectors, matrices, signed and unsigned integers and integer
2780 * vectors. They cannot be arrays or structures."
2782 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2784 * "The attribute qualifier can be used only with float,
2785 * floating-point vectors, and matrices. Attribute variables
2786 * cannot be declared as arrays or structures."
2788 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
2790 * "Vertex shader inputs can only be float, floating-point
2791 * vectors, matrices, signed and unsigned integers and integer
2792 * vectors. Vertex shader inputs cannot be arrays or
2795 const glsl_type
*check_type
= var
->type
->is_array()
2796 ? var
->type
->fields
.array
: var
->type
;
2798 switch (check_type
->base_type
) {
2799 case GLSL_TYPE_FLOAT
:
2801 case GLSL_TYPE_UINT
:
2803 if (state
->is_version(120, 300))
2807 _mesa_glsl_error(& loc
, state
,
2808 "vertex shader input / attribute cannot have "
2810 var
->type
->is_array() ? "array of " : "",
2812 error_emitted
= true;
2815 if (!error_emitted
&& var
->type
->is_array() &&
2816 !state
->check_version(140, 0, &loc
,
2817 "vertex shader input / attribute "
2818 "cannot have array type")) {
2819 error_emitted
= true;
2824 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2825 * so must integer vertex outputs.
2827 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2828 * "Fragment shader inputs that are signed or unsigned integers or
2829 * integer vectors must be qualified with the interpolation qualifier
2832 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2833 * "Fragment shader inputs that are, or contain, signed or unsigned
2834 * integers or integer vectors must be qualified with the
2835 * interpolation qualifier flat."
2837 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2838 * "Vertex shader outputs that are, or contain, signed or unsigned
2839 * integers or integer vectors must be qualified with the
2840 * interpolation qualifier flat."
2842 * Note that prior to GLSL 1.50, this requirement applied to vertex
2843 * outputs rather than fragment inputs. That creates problems in the
2844 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2845 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2846 * apply the restriction to both vertex outputs and fragment inputs.
2848 * Note also that the desktop GLSL specs are missing the text "or
2849 * contain"; this is presumably an oversight, since there is no
2850 * reasonable way to interpolate a fragment shader input that contains
2853 if (state
->is_version(130, 300) &&
2854 var
->type
->contains_integer() &&
2855 var
->interpolation
!= INTERP_QUALIFIER_FLAT
&&
2856 ((state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)
2857 || (state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
2858 && state
->es_shader
))) {
2859 const char *var_type
= (state
->target
== vertex_shader
) ?
2860 "vertex output" : "fragment input";
2861 _mesa_glsl_error(&loc
, state
, "If a %s is (or contains) "
2862 "an integer, then it must be qualified with 'flat'",
2867 /* Interpolation qualifiers cannot be applied to 'centroid' and
2868 * 'centroid varying'.
2870 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2871 * "interpolation qualifiers may only precede the qualifiers in,
2872 * centroid in, out, or centroid out in a declaration. They do not apply
2873 * to the deprecated storage qualifiers varying or centroid varying."
2875 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2877 if (state
->is_version(130, 0)
2878 && this->type
->qualifier
.has_interpolation()
2879 && this->type
->qualifier
.flags
.q
.varying
) {
2881 const char *i
= this->type
->qualifier
.interpolation_string();
2884 if (this->type
->qualifier
.flags
.q
.centroid
)
2885 s
= "centroid varying";
2889 _mesa_glsl_error(&loc
, state
,
2890 "qualifier '%s' cannot be applied to the "
2891 "deprecated storage qualifier '%s'", i
, s
);
2895 /* Interpolation qualifiers can only apply to vertex shader outputs and
2896 * fragment shader inputs.
2898 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2899 * "Outputs from a vertex shader (out) and inputs to a fragment
2900 * shader (in) can be further qualified with one or more of these
2901 * interpolation qualifiers"
2903 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
2904 * "These interpolation qualifiers may only precede the qualifiers
2905 * in, centroid in, out, or centroid out in a declaration. They do
2906 * not apply to inputs into a vertex shader or outputs from a
2909 if (state
->is_version(130, 300)
2910 && this->type
->qualifier
.has_interpolation()) {
2912 const char *i
= this->type
->qualifier
.interpolation_string();
2915 switch (state
->target
) {
2917 if (this->type
->qualifier
.flags
.q
.in
) {
2918 _mesa_glsl_error(&loc
, state
,
2919 "qualifier '%s' cannot be applied to vertex "
2920 "shader inputs", i
);
2923 case fragment_shader
:
2924 if (this->type
->qualifier
.flags
.q
.out
) {
2925 _mesa_glsl_error(&loc
, state
,
2926 "qualifier '%s' cannot be applied to fragment "
2927 "shader outputs", i
);
2936 /* From section 4.3.4 of the GLSL 1.30 spec:
2937 * "It is an error to use centroid in in a vertex shader."
2939 * From section 4.3.4 of the GLSL ES 3.00 spec:
2940 * "It is an error to use centroid in or interpolation qualifiers in
2941 * a vertex shader input."
2943 if (state
->is_version(130, 300)
2944 && this->type
->qualifier
.flags
.q
.centroid
2945 && this->type
->qualifier
.flags
.q
.in
2946 && state
->target
== vertex_shader
) {
2948 _mesa_glsl_error(&loc
, state
,
2949 "'centroid in' cannot be used in a vertex shader");
2953 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2955 if (this->type
->specifier
->precision
!= ast_precision_none
) {
2956 state
->check_precision_qualifiers_allowed(&loc
);
2960 /* Precision qualifiers only apply to floating point and integer types.
2962 * From section 4.5.2 of the GLSL 1.30 spec:
2963 * "Any floating point or any integer declaration can have the type
2964 * preceded by one of these precision qualifiers [...] Literal
2965 * constants do not have precision qualifiers. Neither do Boolean
2968 * In GLSL ES, sampler types are also allowed.
2970 * From page 87 of the GLSL ES spec:
2971 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2973 if (this->type
->specifier
->precision
!= ast_precision_none
2974 && !var
->type
->is_float()
2975 && !var
->type
->is_integer()
2976 && !(var
->type
->is_sampler() && state
->es_shader
)
2977 && !(var
->type
->is_array()
2978 && (var
->type
->fields
.array
->is_float()
2979 || var
->type
->fields
.array
->is_integer()))) {
2981 _mesa_glsl_error(&loc
, state
,
2982 "precision qualifiers apply only to floating point"
2983 "%s types", state
->es_shader
? ", integer, and sampler"
2987 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2989 * "[Sampler types] can only be declared as function
2990 * parameters or uniform variables (see Section 4.3.5
2993 if (var_type
->contains_sampler() &&
2994 !this->type
->qualifier
.flags
.q
.uniform
) {
2995 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2998 /* Process the initializer and add its instructions to a temporary
2999 * list. This list will be added to the instruction stream (below) after
3000 * the declaration is added. This is done because in some cases (such as
3001 * redeclarations) the declaration may not actually be added to the
3002 * instruction stream.
3004 exec_list initializer_instructions
;
3005 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
3007 if (decl
->initializer
!= NULL
) {
3008 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3010 &initializer_instructions
, state
);
3013 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3015 * "It is an error to write to a const variable outside of
3016 * its declaration, so they must be initialized when
3019 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3020 _mesa_glsl_error(& loc
, state
,
3021 "const declaration of `%s' must be initialized",
3025 /* If the declaration is not a redeclaration, there are a few additional
3026 * semantic checks that must be applied. In addition, variable that was
3027 * created for the declaration should be added to the IR stream.
3029 if (earlier
== NULL
) {
3030 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3032 * "Identifiers starting with "gl_" are reserved for use by
3033 * OpenGL, and may not be declared in a shader as either a
3034 * variable or a function."
3036 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
3037 _mesa_glsl_error(& loc
, state
,
3038 "identifier `%s' uses reserved `gl_' prefix",
3040 else if (strstr(decl
->identifier
, "__")) {
3041 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3044 * "In addition, all identifiers containing two
3045 * consecutive underscores (__) are reserved as
3046 * possible future keywords."
3048 _mesa_glsl_error(& loc
, state
,
3049 "identifier `%s' uses reserved `__' string",
3053 /* Add the variable to the symbol table. Note that the initializer's
3054 * IR was already processed earlier (though it hasn't been emitted
3055 * yet), without the variable in scope.
3057 * This differs from most C-like languages, but it follows the GLSL
3058 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3061 * "Within a declaration, the scope of a name starts immediately
3062 * after the initializer if present or immediately after the name
3063 * being declared if not."
3065 if (!state
->symbols
->add_variable(var
)) {
3066 YYLTYPE loc
= this->get_location();
3067 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3068 "current scope", decl
->identifier
);
3072 /* Push the variable declaration to the top. It means that all the
3073 * variable declarations will appear in a funny last-to-first order,
3074 * but otherwise we run into trouble if a function is prototyped, a
3075 * global var is decled, then the function is defined with usage of
3076 * the global var. See glslparsertest's CorrectModule.frag.
3078 instructions
->push_head(var
);
3081 instructions
->append_list(&initializer_instructions
);
3085 /* Generally, variable declarations do not have r-values. However,
3086 * one is used for the declaration in
3088 * while (bool b = some_condition()) {
3092 * so we return the rvalue from the last seen declaration here.
3099 ast_parameter_declarator::hir(exec_list
*instructions
,
3100 struct _mesa_glsl_parse_state
*state
)
3103 const struct glsl_type
*type
;
3104 const char *name
= NULL
;
3105 YYLTYPE loc
= this->get_location();
3107 type
= this->type
->specifier
->glsl_type(& name
, state
);
3111 _mesa_glsl_error(& loc
, state
,
3112 "invalid type `%s' in declaration of `%s'",
3113 name
, this->identifier
);
3115 _mesa_glsl_error(& loc
, state
,
3116 "invalid type in declaration of `%s'",
3120 type
= glsl_type::error_type
;
3123 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3125 * "Functions that accept no input arguments need not use void in the
3126 * argument list because prototypes (or definitions) are required and
3127 * therefore there is no ambiguity when an empty argument list "( )" is
3128 * declared. The idiom "(void)" as a parameter list is provided for
3131 * Placing this check here prevents a void parameter being set up
3132 * for a function, which avoids tripping up checks for main taking
3133 * parameters and lookups of an unnamed symbol.
3135 if (type
->is_void()) {
3136 if (this->identifier
!= NULL
)
3137 _mesa_glsl_error(& loc
, state
,
3138 "named parameter cannot have type `void'");
3144 if (formal_parameter
&& (this->identifier
== NULL
)) {
3145 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3149 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3150 * call already handled the "vec4[..] foo" case.
3152 if (this->is_array
) {
3153 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3156 if (!type
->is_error() && type
->array_size() == 0) {
3157 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3158 "a declared size.");
3159 type
= glsl_type::error_type
;
3163 ir_variable
*var
= new(ctx
)
3164 ir_variable(type
, this->identifier
, ir_var_function_in
);
3166 /* Apply any specified qualifiers to the parameter declaration. Note that
3167 * for function parameters the default mode is 'in'.
3169 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3172 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3174 * "Samplers cannot be treated as l-values; hence cannot be used
3175 * as out or inout function parameters, nor can they be assigned
3178 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3179 && type
->contains_sampler()) {
3180 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3181 type
= glsl_type::error_type
;
3184 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3186 * "When calling a function, expressions that do not evaluate to
3187 * l-values cannot be passed to parameters declared as out or inout."
3189 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3191 * "Other binary or unary expressions, non-dereferenced arrays,
3192 * function names, swizzles with repeated fields, and constants
3193 * cannot be l-values."
3195 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3196 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3198 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3200 && !state
->check_version(120, 100, &loc
,
3201 "Arrays cannot be out or inout parameters")) {
3202 type
= glsl_type::error_type
;
3205 instructions
->push_tail(var
);
3207 /* Parameter declarations do not have r-values.
3214 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3216 exec_list
*ir_parameters
,
3217 _mesa_glsl_parse_state
*state
)
3219 ast_parameter_declarator
*void_param
= NULL
;
3222 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3223 param
->formal_parameter
= formal
;
3224 param
->hir(ir_parameters
, state
);
3232 if ((void_param
!= NULL
) && (count
> 1)) {
3233 YYLTYPE loc
= void_param
->get_location();
3235 _mesa_glsl_error(& loc
, state
,
3236 "`void' parameter must be only parameter");
3242 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3244 /* IR invariants disallow function declarations or definitions
3245 * nested within other function definitions. But there is no
3246 * requirement about the relative order of function declarations
3247 * and definitions with respect to one another. So simply insert
3248 * the new ir_function block at the end of the toplevel instruction
3251 state
->toplevel_ir
->push_tail(f
);
3256 ast_function::hir(exec_list
*instructions
,
3257 struct _mesa_glsl_parse_state
*state
)
3260 ir_function
*f
= NULL
;
3261 ir_function_signature
*sig
= NULL
;
3262 exec_list hir_parameters
;
3264 const char *const name
= identifier
;
3266 /* New functions are always added to the top-level IR instruction stream,
3267 * so this instruction list pointer is ignored. See also emit_function
3270 (void) instructions
;
3272 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3274 * "Function declarations (prototypes) cannot occur inside of functions;
3275 * they must be at global scope, or for the built-in functions, outside
3276 * the global scope."
3278 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3280 * "User defined functions may only be defined within the global scope."
3282 * Note that this language does not appear in GLSL 1.10.
3284 if ((state
->current_function
!= NULL
) &&
3285 state
->is_version(120, 100)) {
3286 YYLTYPE loc
= this->get_location();
3287 _mesa_glsl_error(&loc
, state
,
3288 "declaration of function `%s' not allowed within "
3289 "function body", name
);
3292 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3294 * "Identifiers starting with "gl_" are reserved for use by
3295 * OpenGL, and may not be declared in a shader as either a
3296 * variable or a function."
3298 if (strncmp(name
, "gl_", 3) == 0) {
3299 YYLTYPE loc
= this->get_location();
3300 _mesa_glsl_error(&loc
, state
,
3301 "identifier `%s' uses reserved `gl_' prefix", name
);
3304 /* Convert the list of function parameters to HIR now so that they can be
3305 * used below to compare this function's signature with previously seen
3306 * signatures for functions with the same name.
3308 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3310 & hir_parameters
, state
);
3312 const char *return_type_name
;
3313 const glsl_type
*return_type
=
3314 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3317 YYLTYPE loc
= this->get_location();
3318 _mesa_glsl_error(&loc
, state
,
3319 "function `%s' has undeclared return type `%s'",
3320 name
, return_type_name
);
3321 return_type
= glsl_type::error_type
;
3324 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3325 * "No qualifier is allowed on the return type of a function."
3327 if (this->return_type
->has_qualifiers()) {
3328 YYLTYPE loc
= this->get_location();
3329 _mesa_glsl_error(& loc
, state
,
3330 "function `%s' return type has qualifiers", name
);
3333 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3335 * "[Sampler types] can only be declared as function parameters
3336 * or uniform variables (see Section 4.3.5 "Uniform")".
3338 if (return_type
->contains_sampler()) {
3339 YYLTYPE loc
= this->get_location();
3340 _mesa_glsl_error(&loc
, state
,
3341 "function `%s' return type can't contain a sampler",
3345 /* Verify that this function's signature either doesn't match a previously
3346 * seen signature for a function with the same name, or, if a match is found,
3347 * that the previously seen signature does not have an associated definition.
3349 f
= state
->symbols
->get_function(name
);
3350 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3351 sig
= f
->exact_matching_signature(&hir_parameters
);
3353 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3354 if (badvar
!= NULL
) {
3355 YYLTYPE loc
= this->get_location();
3357 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3358 "qualifiers don't match prototype", name
, badvar
);
3361 if (sig
->return_type
!= return_type
) {
3362 YYLTYPE loc
= this->get_location();
3364 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3365 "match prototype", name
);
3368 if (is_definition
&& sig
->is_defined
) {
3369 YYLTYPE loc
= this->get_location();
3371 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3375 f
= new(ctx
) ir_function(name
);
3376 if (!state
->symbols
->add_function(f
)) {
3377 /* This function name shadows a non-function use of the same name. */
3378 YYLTYPE loc
= this->get_location();
3380 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3381 "non-function", name
);
3385 emit_function(state
, f
);
3388 /* Verify the return type of main() */
3389 if (strcmp(name
, "main") == 0) {
3390 if (! return_type
->is_void()) {
3391 YYLTYPE loc
= this->get_location();
3393 _mesa_glsl_error(& loc
, state
, "main() must return void");
3396 if (!hir_parameters
.is_empty()) {
3397 YYLTYPE loc
= this->get_location();
3399 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3403 /* Finish storing the information about this new function in its signature.
3406 sig
= new(ctx
) ir_function_signature(return_type
);
3407 f
->add_signature(sig
);
3410 sig
->replace_parameters(&hir_parameters
);
3413 /* Function declarations (prototypes) do not have r-values.
3420 ast_function_definition::hir(exec_list
*instructions
,
3421 struct _mesa_glsl_parse_state
*state
)
3423 prototype
->is_definition
= true;
3424 prototype
->hir(instructions
, state
);
3426 ir_function_signature
*signature
= prototype
->signature
;
3427 if (signature
== NULL
)
3430 assert(state
->current_function
== NULL
);
3431 state
->current_function
= signature
;
3432 state
->found_return
= false;
3434 /* Duplicate parameters declared in the prototype as concrete variables.
3435 * Add these to the symbol table.
3437 state
->symbols
->push_scope();
3438 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3439 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3441 assert(var
!= NULL
);
3443 /* The only way a parameter would "exist" is if two parameters have
3446 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3447 YYLTYPE loc
= this->get_location();
3449 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3451 state
->symbols
->add_variable(var
);
3455 /* Convert the body of the function to HIR. */
3456 this->body
->hir(&signature
->body
, state
);
3457 signature
->is_defined
= true;
3459 state
->symbols
->pop_scope();
3461 assert(state
->current_function
== signature
);
3462 state
->current_function
= NULL
;
3464 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3465 YYLTYPE loc
= this->get_location();
3466 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3467 "%s, but no return statement",
3468 signature
->function_name(),
3469 signature
->return_type
->name
);
3472 /* Function definitions do not have r-values.
3479 ast_jump_statement::hir(exec_list
*instructions
,
3480 struct _mesa_glsl_parse_state
*state
)
3487 assert(state
->current_function
);
3489 if (opt_return_value
) {
3490 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3492 /* The value of the return type can be NULL if the shader says
3493 * 'return foo();' and foo() is a function that returns void.
3495 * NOTE: The GLSL spec doesn't say that this is an error. The type
3496 * of the return value is void. If the return type of the function is
3497 * also void, then this should compile without error. Seriously.
3499 const glsl_type
*const ret_type
=
3500 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3502 /* Implicit conversions are not allowed for return values. */
3503 if (state
->current_function
->return_type
!= ret_type
) {
3504 YYLTYPE loc
= this->get_location();
3506 _mesa_glsl_error(& loc
, state
,
3507 "`return' with wrong type %s, in function `%s' "
3510 state
->current_function
->function_name(),
3511 state
->current_function
->return_type
->name
);
3514 inst
= new(ctx
) ir_return(ret
);
3516 if (state
->current_function
->return_type
->base_type
!=
3518 YYLTYPE loc
= this->get_location();
3520 _mesa_glsl_error(& loc
, state
,
3521 "`return' with no value, in function %s returning "
3523 state
->current_function
->function_name());
3525 inst
= new(ctx
) ir_return
;
3528 state
->found_return
= true;
3529 instructions
->push_tail(inst
);
3534 if (state
->target
!= fragment_shader
) {
3535 YYLTYPE loc
= this->get_location();
3537 _mesa_glsl_error(& loc
, state
,
3538 "`discard' may only appear in a fragment shader");
3540 instructions
->push_tail(new(ctx
) ir_discard
);
3545 if (mode
== ast_continue
&&
3546 state
->loop_nesting_ast
== NULL
) {
3547 YYLTYPE loc
= this->get_location();
3549 _mesa_glsl_error(& loc
, state
,
3550 "continue may only appear in a loop");
3551 } else if (mode
== ast_break
&&
3552 state
->loop_nesting_ast
== NULL
&&
3553 state
->switch_state
.switch_nesting_ast
== NULL
) {
3554 YYLTYPE loc
= this->get_location();
3556 _mesa_glsl_error(& loc
, state
,
3557 "break may only appear in a loop or a switch");
3559 /* For a loop, inline the for loop expression again,
3560 * since we don't know where near the end of
3561 * the loop body the normal copy of it
3562 * is going to be placed.
3564 if (state
->loop_nesting_ast
!= NULL
&&
3565 mode
== ast_continue
&&
3566 state
->loop_nesting_ast
->rest_expression
) {
3567 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3571 if (state
->switch_state
.is_switch_innermost
&&
3572 mode
== ast_break
) {
3573 /* Force break out of switch by setting is_break switch state.
3575 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3576 ir_dereference_variable
*const deref_is_break_var
=
3577 new(ctx
) ir_dereference_variable(is_break_var
);
3578 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3579 ir_assignment
*const set_break_var
=
3580 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3582 instructions
->push_tail(set_break_var
);
3585 ir_loop_jump
*const jump
=
3586 new(ctx
) ir_loop_jump((mode
== ast_break
)
3587 ? ir_loop_jump::jump_break
3588 : ir_loop_jump::jump_continue
);
3589 instructions
->push_tail(jump
);
3596 /* Jump instructions do not have r-values.
3603 ast_selection_statement::hir(exec_list
*instructions
,
3604 struct _mesa_glsl_parse_state
*state
)
3608 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3610 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3612 * "Any expression whose type evaluates to a Boolean can be used as the
3613 * conditional expression bool-expression. Vector types are not accepted
3614 * as the expression to if."
3616 * The checks are separated so that higher quality diagnostics can be
3617 * generated for cases where both rules are violated.
3619 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3620 YYLTYPE loc
= this->condition
->get_location();
3622 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3626 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3628 if (then_statement
!= NULL
) {
3629 state
->symbols
->push_scope();
3630 then_statement
->hir(& stmt
->then_instructions
, state
);
3631 state
->symbols
->pop_scope();
3634 if (else_statement
!= NULL
) {
3635 state
->symbols
->push_scope();
3636 else_statement
->hir(& stmt
->else_instructions
, state
);
3637 state
->symbols
->pop_scope();
3640 instructions
->push_tail(stmt
);
3642 /* if-statements do not have r-values.
3649 ast_switch_statement::hir(exec_list
*instructions
,
3650 struct _mesa_glsl_parse_state
*state
)
3654 ir_rvalue
*const test_expression
=
3655 this->test_expression
->hir(instructions
, state
);
3657 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3659 * "The type of init-expression in a switch statement must be a
3662 if (!test_expression
->type
->is_scalar() ||
3663 !test_expression
->type
->is_integer()) {
3664 YYLTYPE loc
= this->test_expression
->get_location();
3666 _mesa_glsl_error(& loc
,
3668 "switch-statement expression must be scalar "
3672 /* Track the switch-statement nesting in a stack-like manner.
3674 struct glsl_switch_state saved
= state
->switch_state
;
3676 state
->switch_state
.is_switch_innermost
= true;
3677 state
->switch_state
.switch_nesting_ast
= this;
3678 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3679 hash_table_pointer_compare
);
3680 state
->switch_state
.previous_default
= NULL
;
3682 /* Initalize is_fallthru state to false.
3684 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3685 state
->switch_state
.is_fallthru_var
=
3686 new(ctx
) ir_variable(glsl_type::bool_type
,
3687 "switch_is_fallthru_tmp",
3689 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3691 ir_dereference_variable
*deref_is_fallthru_var
=
3692 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3693 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3696 /* Initalize is_break state to false.
3698 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3699 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3700 "switch_is_break_tmp",
3702 instructions
->push_tail(state
->switch_state
.is_break_var
);
3704 ir_dereference_variable
*deref_is_break_var
=
3705 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3706 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3709 /* Cache test expression.
3711 test_to_hir(instructions
, state
);
3713 /* Emit code for body of switch stmt.
3715 body
->hir(instructions
, state
);
3717 hash_table_dtor(state
->switch_state
.labels_ht
);
3719 state
->switch_state
= saved
;
3721 /* Switch statements do not have r-values. */
3727 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3728 struct _mesa_glsl_parse_state
*state
)
3732 /* Cache value of test expression. */
3733 ir_rvalue
*const test_val
=
3734 test_expression
->hir(instructions
,
3737 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3740 ir_dereference_variable
*deref_test_var
=
3741 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3743 instructions
->push_tail(state
->switch_state
.test_var
);
3744 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
3749 ast_switch_body::hir(exec_list
*instructions
,
3750 struct _mesa_glsl_parse_state
*state
)
3753 stmts
->hir(instructions
, state
);
3755 /* Switch bodies do not have r-values. */
3760 ast_case_statement_list::hir(exec_list
*instructions
,
3761 struct _mesa_glsl_parse_state
*state
)
3763 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3764 case_stmt
->hir(instructions
, state
);
3766 /* Case statements do not have r-values. */
3771 ast_case_statement::hir(exec_list
*instructions
,
3772 struct _mesa_glsl_parse_state
*state
)
3774 labels
->hir(instructions
, state
);
3776 /* Conditionally set fallthru state based on break state. */
3777 ir_constant
*const false_val
= new(state
) ir_constant(false);
3778 ir_dereference_variable
*const deref_is_fallthru_var
=
3779 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3780 ir_dereference_variable
*const deref_is_break_var
=
3781 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3782 ir_assignment
*const reset_fallthru_on_break
=
3783 new(state
) ir_assignment(deref_is_fallthru_var
,
3785 deref_is_break_var
);
3786 instructions
->push_tail(reset_fallthru_on_break
);
3788 /* Guard case statements depending on fallthru state. */
3789 ir_dereference_variable
*const deref_fallthru_guard
=
3790 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3791 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3793 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3794 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3796 instructions
->push_tail(test_fallthru
);
3798 /* Case statements do not have r-values. */
3804 ast_case_label_list::hir(exec_list
*instructions
,
3805 struct _mesa_glsl_parse_state
*state
)
3807 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3808 label
->hir(instructions
, state
);
3810 /* Case labels do not have r-values. */
3815 ast_case_label::hir(exec_list
*instructions
,
3816 struct _mesa_glsl_parse_state
*state
)
3820 ir_dereference_variable
*deref_fallthru_var
=
3821 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3823 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3825 /* If not default case, ... */
3826 if (this->test_value
!= NULL
) {
3827 /* Conditionally set fallthru state based on
3828 * comparison of cached test expression value to case label.
3830 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3831 ir_constant
*label_const
= label_rval
->constant_expression_value();
3834 YYLTYPE loc
= this->test_value
->get_location();
3836 _mesa_glsl_error(& loc
, state
,
3837 "switch statement case label must be a "
3838 "constant expression");
3840 /* Stuff a dummy value in to allow processing to continue. */
3841 label_const
= new(ctx
) ir_constant(0);
3843 ast_expression
*previous_label
= (ast_expression
*)
3844 hash_table_find(state
->switch_state
.labels_ht
,
3845 (void *)(uintptr_t)label_const
->value
.u
[0]);
3847 if (previous_label
) {
3848 YYLTYPE loc
= this->test_value
->get_location();
3849 _mesa_glsl_error(& loc
, state
,
3850 "duplicate case value");
3852 loc
= previous_label
->get_location();
3853 _mesa_glsl_error(& loc
, state
,
3854 "this is the previous case label");
3856 hash_table_insert(state
->switch_state
.labels_ht
,
3858 (void *)(uintptr_t)label_const
->value
.u
[0]);
3862 ir_dereference_variable
*deref_test_var
=
3863 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3865 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3869 ir_assignment
*set_fallthru_on_test
=
3870 new(ctx
) ir_assignment(deref_fallthru_var
,
3874 instructions
->push_tail(set_fallthru_on_test
);
3875 } else { /* default case */
3876 if (state
->switch_state
.previous_default
) {
3877 YYLTYPE loc
= this->get_location();
3878 _mesa_glsl_error(& loc
, state
,
3879 "multiple default labels in one switch");
3881 loc
= state
->switch_state
.previous_default
->get_location();
3882 _mesa_glsl_error(& loc
, state
,
3883 "this is the first default label");
3885 state
->switch_state
.previous_default
= this;
3887 /* Set falltrhu state. */
3888 ir_assignment
*set_fallthru
=
3889 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
3891 instructions
->push_tail(set_fallthru
);
3894 /* Case statements do not have r-values. */
3899 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3900 struct _mesa_glsl_parse_state
*state
)
3904 if (condition
!= NULL
) {
3905 ir_rvalue
*const cond
=
3906 condition
->hir(& stmt
->body_instructions
, state
);
3909 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3910 YYLTYPE loc
= condition
->get_location();
3912 _mesa_glsl_error(& loc
, state
,
3913 "loop condition must be scalar boolean");
3915 /* As the first code in the loop body, generate a block that looks
3916 * like 'if (!condition) break;' as the loop termination condition.
3918 ir_rvalue
*const not_cond
=
3919 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
3921 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3923 ir_jump
*const break_stmt
=
3924 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3926 if_stmt
->then_instructions
.push_tail(break_stmt
);
3927 stmt
->body_instructions
.push_tail(if_stmt
);
3934 ast_iteration_statement::hir(exec_list
*instructions
,
3935 struct _mesa_glsl_parse_state
*state
)
3939 /* For-loops and while-loops start a new scope, but do-while loops do not.
3941 if (mode
!= ast_do_while
)
3942 state
->symbols
->push_scope();
3944 if (init_statement
!= NULL
)
3945 init_statement
->hir(instructions
, state
);
3947 ir_loop
*const stmt
= new(ctx
) ir_loop();
3948 instructions
->push_tail(stmt
);
3950 /* Track the current loop nesting. */
3951 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3953 state
->loop_nesting_ast
= this;
3955 /* Likewise, indicate that following code is closest to a loop,
3956 * NOT closest to a switch.
3958 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3959 state
->switch_state
.is_switch_innermost
= false;
3961 if (mode
!= ast_do_while
)
3962 condition_to_hir(stmt
, state
);
3965 body
->hir(& stmt
->body_instructions
, state
);
3967 if (rest_expression
!= NULL
)
3968 rest_expression
->hir(& stmt
->body_instructions
, state
);
3970 if (mode
== ast_do_while
)
3971 condition_to_hir(stmt
, state
);
3973 if (mode
!= ast_do_while
)
3974 state
->symbols
->pop_scope();
3976 /* Restore previous nesting before returning. */
3977 state
->loop_nesting_ast
= nesting_ast
;
3978 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3980 /* Loops do not have r-values.
3987 * Determine if the given type is valid for establishing a default precision
3990 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
3992 * "The precision statement
3994 * precision precision-qualifier type;
3996 * can be used to establish a default precision qualifier. The type field
3997 * can be either int or float or any of the sampler types, and the
3998 * precision-qualifier can be lowp, mediump, or highp."
4000 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4001 * qualifiers on sampler types, but this seems like an oversight (since the
4002 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4003 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4007 is_valid_default_precision_type(const struct _mesa_glsl_parse_state
*state
,
4008 const char *type_name
)
4010 const struct glsl_type
*type
= state
->symbols
->get_type(type_name
);
4014 switch (type
->base_type
) {
4016 case GLSL_TYPE_FLOAT
:
4017 /* "int" and "float" are valid, but vectors and matrices are not. */
4018 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4019 case GLSL_TYPE_SAMPLER
:
4028 ast_type_specifier::hir(exec_list
*instructions
,
4029 struct _mesa_glsl_parse_state
*state
)
4031 if (!this->is_precision_statement
&& this->structure
== NULL
)
4034 YYLTYPE loc
= this->get_location();
4036 if (this->precision
!= ast_precision_none
4037 && !state
->check_precision_qualifiers_allowed(&loc
)) {
4040 if (this->precision
!= ast_precision_none
4041 && this->structure
!= NULL
) {
4042 _mesa_glsl_error(&loc
, state
,
4043 "precision qualifiers do not apply to structures");
4047 /* If this is a precision statement, check that the type to which it is
4048 * applied is either float or int.
4050 * From section 4.5.3 of the GLSL 1.30 spec:
4051 * "The precision statement
4052 * precision precision-qualifier type;
4053 * can be used to establish a default precision qualifier. The type
4054 * field can be either int or float [...]. Any other types or
4055 * qualifiers will result in an error.
4057 if (this->is_precision_statement
) {
4058 assert(this->precision
!= ast_precision_none
);
4059 assert(this->structure
== NULL
); /* The check for structures was
4060 * performed above. */
4061 if (this->is_array
) {
4062 _mesa_glsl_error(&loc
, state
,
4063 "default precision statements do not apply to "
4067 if (!is_valid_default_precision_type(state
, this->type_name
)) {
4068 _mesa_glsl_error(&loc
, state
,
4069 "default precision statements apply only to types "
4070 "float, int, and sampler types");
4074 /* FINISHME: Translate precision statements into IR. */
4078 if (this->structure
!= NULL
)
4079 return this->structure
->hir(instructions
, state
);
4086 * Process a structure or interface block tree into an array of structure fields
4088 * After parsing, where there are some syntax differnces, structures and
4089 * interface blocks are almost identical. They are similar enough that the
4090 * AST for each can be processed the same way into a set of
4091 * \c glsl_struct_field to describe the members.
4094 * The number of fields processed. A pointer to the array structure fields is
4095 * stored in \c *fields_ret.
4098 ast_process_structure_or_interface_block(exec_list
*instructions
,
4099 struct _mesa_glsl_parse_state
*state
,
4100 exec_list
*declarations
,
4102 glsl_struct_field
**fields_ret
,
4104 bool block_row_major
)
4106 unsigned decl_count
= 0;
4108 /* Make an initial pass over the list of fields to determine how
4109 * many there are. Each element in this list is an ast_declarator_list.
4110 * This means that we actually need to count the number of elements in the
4111 * 'declarations' list in each of the elements.
4113 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4114 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4119 /* Allocate storage for the fields and process the field
4120 * declarations. As the declarations are processed, try to also convert
4121 * the types to HIR. This ensures that structure definitions embedded in
4122 * other structure definitions or in interface blocks are processed.
4124 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4128 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4129 const char *type_name
;
4131 decl_list
->type
->specifier
->hir(instructions
, state
);
4133 /* Section 10.9 of the GLSL ES 1.00 specification states that
4134 * embedded structure definitions have been removed from the language.
4136 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4137 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
4138 "not allowed in GLSL ES 1.00.");
4141 const glsl_type
*decl_type
=
4142 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
4144 foreach_list_typed (ast_declaration
, decl
, link
,
4145 &decl_list
->declarations
) {
4146 /* From the GL_ARB_uniform_buffer_object spec:
4148 * "Sampler types are not allowed inside of uniform
4149 * blocks. All other types, arrays, and structures
4150 * allowed for uniforms are allowed within a uniform
4153 const struct glsl_type
*field_type
= decl_type
;
4155 if (is_interface
&& field_type
->contains_sampler()) {
4156 YYLTYPE loc
= decl_list
->get_location();
4157 _mesa_glsl_error(&loc
, state
,
4158 "Uniform in non-default uniform block contains sampler\n");
4161 const struct ast_type_qualifier
*const qual
=
4162 & decl_list
->type
->qualifier
;
4163 if (qual
->flags
.q
.std140
||
4164 qual
->flags
.q
.packed
||
4165 qual
->flags
.q
.shared
) {
4166 _mesa_glsl_error(&loc
, state
,
4167 "uniform block layout qualifiers std140, packed, and "
4168 "shared can only be applied to uniform blocks, not "
4172 if (decl
->is_array
) {
4173 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4176 fields
[i
].type
= (field_type
!= NULL
)
4177 ? field_type
: glsl_type::error_type
;
4178 fields
[i
].name
= decl
->identifier
;
4180 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4181 if (!field_type
->is_matrix() && !field_type
->is_record()) {
4182 _mesa_glsl_error(&loc
, state
,
4183 "uniform block layout qualifiers row_major and "
4184 "column_major can only be applied to matrix and "
4187 validate_matrix_layout_for_type(state
, &loc
, field_type
);
4190 if (field_type
->is_matrix() ||
4191 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4192 fields
[i
].row_major
= block_row_major
;
4193 if (qual
->flags
.q
.row_major
)
4194 fields
[i
].row_major
= true;
4195 else if (qual
->flags
.q
.column_major
)
4196 fields
[i
].row_major
= false;
4203 assert(i
== decl_count
);
4205 *fields_ret
= fields
;
4211 ast_struct_specifier::hir(exec_list
*instructions
,
4212 struct _mesa_glsl_parse_state
*state
)
4214 YYLTYPE loc
= this->get_location();
4215 glsl_struct_field
*fields
;
4216 unsigned decl_count
=
4217 ast_process_structure_or_interface_block(instructions
,
4219 &this->declarations
,
4225 const glsl_type
*t
=
4226 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4228 if (!state
->symbols
->add_type(name
, t
)) {
4229 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4231 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4233 state
->num_user_structures
+ 1);
4235 s
[state
->num_user_structures
] = t
;
4236 state
->user_structures
= s
;
4237 state
->num_user_structures
++;
4241 /* Structure type definitions do not have r-values.
4247 ast_uniform_block::hir(exec_list
*instructions
,
4248 struct _mesa_glsl_parse_state
*state
)
4250 YYLTYPE loc
= this->get_location();
4252 /* The ast_uniform_block has a list of ast_declarator_lists. We
4253 * need to turn those into ir_variables with an association
4254 * with this uniform block.
4256 enum glsl_interface_packing packing
;
4257 if (this->layout
.flags
.q
.shared
) {
4258 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4259 } else if (this->layout
.flags
.q
.packed
) {
4260 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4262 /* The default layout is std140.
4264 packing
= GLSL_INTERFACE_PACKING_STD140
;
4267 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4268 exec_list declared_variables
;
4269 glsl_struct_field
*fields
;
4270 unsigned int num_variables
=
4271 ast_process_structure_or_interface_block(&declared_variables
,
4273 &this->declarations
,
4279 const glsl_type
*block_type
=
4280 glsl_type::get_interface_instance(fields
,
4285 if (!state
->symbols
->add_type(block_type
->name
, block_type
)) {
4286 YYLTYPE loc
= this->get_location();
4287 _mesa_glsl_error(&loc
, state
, "Uniform block name `%s' already taken in "
4288 "the current scope.\n", this->block_name
);
4291 /* Since interface blocks cannot contain statements, it should be
4292 * impossible for the block to generate any instructions.
4294 assert(declared_variables
.is_empty());
4296 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4299 * "If an instance name (instance-name) is used, then it puts all the
4300 * members inside a scope within its own name space, accessed with the
4301 * field selector ( . ) operator (analogously to structures)."
4303 if (this->instance_name
) {
4306 if (this->array_size
!= NULL
) {
4307 const glsl_type
*block_array_type
=
4308 process_array_type(&loc
, block_type
, this->array_size
, state
);
4310 var
= new(state
) ir_variable(block_array_type
,
4311 this->instance_name
,
4314 var
= new(state
) ir_variable(block_type
,
4315 this->instance_name
,
4319 var
->interface_type
= block_type
;
4320 state
->symbols
->add_variable(var
);
4321 instructions
->push_tail(var
);
4323 /* In order to have an array size, the block must also be declared with
4326 assert(this->array_size
== NULL
);
4328 for (unsigned i
= 0; i
< num_variables
; i
++) {
4330 new(state
) ir_variable(fields
[i
].type
,
4331 ralloc_strdup(state
, fields
[i
].name
),
4333 var
->interface_type
= block_type
;
4335 state
->symbols
->add_variable(var
);
4336 instructions
->push_tail(var
);
4344 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
4345 exec_list
*instructions
)
4347 bool gl_FragColor_assigned
= false;
4348 bool gl_FragData_assigned
= false;
4349 bool user_defined_fs_output_assigned
= false;
4350 ir_variable
*user_defined_fs_output
= NULL
;
4352 /* It would be nice to have proper location information. */
4354 memset(&loc
, 0, sizeof(loc
));
4356 foreach_list(node
, instructions
) {
4357 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4359 if (!var
|| !var
->assigned
)
4362 if (strcmp(var
->name
, "gl_FragColor") == 0)
4363 gl_FragColor_assigned
= true;
4364 else if (strcmp(var
->name
, "gl_FragData") == 0)
4365 gl_FragData_assigned
= true;
4366 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4367 if (state
->target
== fragment_shader
&&
4368 var
->mode
== ir_var_shader_out
) {
4369 user_defined_fs_output_assigned
= true;
4370 user_defined_fs_output
= var
;
4375 /* From the GLSL 1.30 spec:
4377 * "If a shader statically assigns a value to gl_FragColor, it
4378 * may not assign a value to any element of gl_FragData. If a
4379 * shader statically writes a value to any element of
4380 * gl_FragData, it may not assign a value to
4381 * gl_FragColor. That is, a shader may assign values to either
4382 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4383 * linked together must also consistently write just one of
4384 * these variables. Similarly, if user declared output
4385 * variables are in use (statically assigned to), then the
4386 * built-in variables gl_FragColor and gl_FragData may not be
4387 * assigned to. These incorrect usages all generate compile
4390 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
4391 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4392 "`gl_FragColor' and `gl_FragData'\n");
4393 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
4394 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4395 "`gl_FragColor' and `%s'\n",
4396 user_defined_fs_output
->name
);
4397 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
4398 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4399 "`gl_FragData' and `%s'\n",
4400 user_defined_fs_output
->name
);