2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
57 #include "program/hash_table.h"
61 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
62 exec_list
*instructions
);
65 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
67 _mesa_glsl_initialize_variables(instructions
, state
);
69 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
71 state
->current_function
= NULL
;
73 state
->toplevel_ir
= instructions
;
75 /* Section 4.2 of the GLSL 1.20 specification states:
76 * "The built-in functions are scoped in a scope outside the global scope
77 * users declare global variables in. That is, a shader's global scope,
78 * available for user-defined functions and global variables, is nested
79 * inside the scope containing the built-in functions."
81 * Since built-in functions like ftransform() access built-in variables,
82 * it follows that those must be in the outer scope as well.
84 * We push scope here to create this nesting effect...but don't pop.
85 * This way, a shader's globals are still in the symbol table for use
88 state
->symbols
->push_scope();
90 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
91 ast
->hir(instructions
, state
);
93 detect_recursion_unlinked(state
, instructions
);
94 detect_conflicting_assignments(state
, instructions
);
96 state
->toplevel_ir
= NULL
;
101 * If a conversion is available, convert one operand to a different type
103 * The \c from \c ir_rvalue is converted "in place".
105 * \param to Type that the operand it to be converted to
106 * \param from Operand that is being converted
107 * \param state GLSL compiler state
110 * If a conversion is possible (or unnecessary), \c true is returned.
111 * Otherwise \c false is returned.
114 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
115 struct _mesa_glsl_parse_state
*state
)
118 if (to
->base_type
== from
->type
->base_type
)
121 /* This conversion was added in GLSL 1.20. If the compilation mode is
122 * GLSL 1.10, the conversion is skipped.
124 if (!state
->is_version(120, 0))
127 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
129 * "There are no implicit array or structure conversions. For
130 * example, an array of int cannot be implicitly converted to an
131 * array of float. There are no implicit conversions between
132 * signed and unsigned integers."
134 /* FINISHME: The above comment is partially a lie. There is int/uint
135 * FINISHME: conversion for immediate constants.
137 if (!to
->is_float() || !from
->type
->is_numeric())
140 /* Convert to a floating point type with the same number of components
141 * as the original type - i.e. int to float, not int to vec4.
143 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
144 from
->type
->matrix_columns
);
146 switch (from
->type
->base_type
) {
148 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
151 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
154 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
164 static const struct glsl_type
*
165 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
167 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
169 const glsl_type
*type_a
= value_a
->type
;
170 const glsl_type
*type_b
= value_b
->type
;
172 /* From GLSL 1.50 spec, page 56:
174 * "The arithmetic binary operators add (+), subtract (-),
175 * multiply (*), and divide (/) operate on integer and
176 * floating-point scalars, vectors, and matrices."
178 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
179 _mesa_glsl_error(loc
, state
,
180 "Operands to arithmetic operators must be numeric");
181 return glsl_type::error_type
;
185 /* "If one operand is floating-point based and the other is
186 * not, then the conversions from Section 4.1.10 "Implicit
187 * Conversions" are applied to the non-floating-point-based operand."
189 if (!apply_implicit_conversion(type_a
, value_b
, state
)
190 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
191 _mesa_glsl_error(loc
, state
,
192 "Could not implicitly convert operands to "
193 "arithmetic operator");
194 return glsl_type::error_type
;
196 type_a
= value_a
->type
;
197 type_b
= value_b
->type
;
199 /* "If the operands are integer types, they must both be signed or
202 * From this rule and the preceeding conversion it can be inferred that
203 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
204 * The is_numeric check above already filtered out the case where either
205 * type is not one of these, so now the base types need only be tested for
208 if (type_a
->base_type
!= type_b
->base_type
) {
209 _mesa_glsl_error(loc
, state
,
210 "base type mismatch for arithmetic operator");
211 return glsl_type::error_type
;
214 /* "All arithmetic binary operators result in the same fundamental type
215 * (signed integer, unsigned integer, or floating-point) as the
216 * operands they operate on, after operand type conversion. After
217 * conversion, the following cases are valid
219 * * The two operands are scalars. In this case the operation is
220 * applied, resulting in a scalar."
222 if (type_a
->is_scalar() && type_b
->is_scalar())
225 /* "* One operand is a scalar, and the other is a vector or matrix.
226 * In this case, the scalar operation is applied independently to each
227 * component of the vector or matrix, resulting in the same size
230 if (type_a
->is_scalar()) {
231 if (!type_b
->is_scalar())
233 } else if (type_b
->is_scalar()) {
237 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
238 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
241 assert(!type_a
->is_scalar());
242 assert(!type_b
->is_scalar());
244 /* "* The two operands are vectors of the same size. In this case, the
245 * operation is done component-wise resulting in the same size
248 if (type_a
->is_vector() && type_b
->is_vector()) {
249 if (type_a
== type_b
) {
252 _mesa_glsl_error(loc
, state
,
253 "vector size mismatch for arithmetic operator");
254 return glsl_type::error_type
;
258 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
259 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
260 * <vector, vector> have been handled. At least one of the operands must
261 * be matrix. Further, since there are no integer matrix types, the base
262 * type of both operands must be float.
264 assert(type_a
->is_matrix() || type_b
->is_matrix());
265 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
266 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
268 /* "* The operator is add (+), subtract (-), or divide (/), and the
269 * operands are matrices with the same number of rows and the same
270 * number of columns. In this case, the operation is done component-
271 * wise resulting in the same size matrix."
272 * * The operator is multiply (*), where both operands are matrices or
273 * one operand is a vector and the other a matrix. A right vector
274 * operand is treated as a column vector and a left vector operand as a
275 * row vector. In all these cases, it is required that the number of
276 * columns of the left operand is equal to the number of rows of the
277 * right operand. Then, the multiply (*) operation does a linear
278 * algebraic multiply, yielding an object that has the same number of
279 * rows as the left operand and the same number of columns as the right
280 * operand. Section 5.10 "Vector and Matrix Operations" explains in
281 * more detail how vectors and matrices are operated on."
284 if (type_a
== type_b
)
287 if (type_a
->is_matrix() && type_b
->is_matrix()) {
288 /* Matrix multiply. The columns of A must match the rows of B. Given
289 * the other previously tested constraints, this means the vector type
290 * of a row from A must be the same as the vector type of a column from
293 if (type_a
->row_type() == type_b
->column_type()) {
294 /* The resulting matrix has the number of columns of matrix B and
295 * the number of rows of matrix A. We get the row count of A by
296 * looking at the size of a vector that makes up a column. The
297 * transpose (size of a row) is done for B.
299 const glsl_type
*const type
=
300 glsl_type::get_instance(type_a
->base_type
,
301 type_a
->column_type()->vector_elements
,
302 type_b
->row_type()->vector_elements
);
303 assert(type
!= glsl_type::error_type
);
307 } else if (type_a
->is_matrix()) {
308 /* A is a matrix and B is a column vector. Columns of A must match
309 * rows of B. Given the other previously tested constraints, this
310 * means the vector type of a row from A must be the same as the
311 * vector the type of B.
313 if (type_a
->row_type() == type_b
) {
314 /* The resulting vector has a number of elements equal to
315 * the number of rows of matrix A. */
316 const glsl_type
*const type
=
317 glsl_type::get_instance(type_a
->base_type
,
318 type_a
->column_type()->vector_elements
,
320 assert(type
!= glsl_type::error_type
);
325 assert(type_b
->is_matrix());
327 /* A is a row vector and B is a matrix. Columns of A must match rows
328 * of B. Given the other previously tested constraints, this means
329 * the type of A must be the same as the vector type of a column from
332 if (type_a
== type_b
->column_type()) {
333 /* The resulting vector has a number of elements equal to
334 * the number of columns of matrix B. */
335 const glsl_type
*const type
=
336 glsl_type::get_instance(type_a
->base_type
,
337 type_b
->row_type()->vector_elements
,
339 assert(type
!= glsl_type::error_type
);
345 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
346 return glsl_type::error_type
;
350 /* "All other cases are illegal."
352 _mesa_glsl_error(loc
, state
, "type mismatch");
353 return glsl_type::error_type
;
357 static const struct glsl_type
*
358 unary_arithmetic_result_type(const struct glsl_type
*type
,
359 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
361 /* From GLSL 1.50 spec, page 57:
363 * "The arithmetic unary operators negate (-), post- and pre-increment
364 * and decrement (-- and ++) operate on integer or floating-point
365 * values (including vectors and matrices). All unary operators work
366 * component-wise on their operands. These result with the same type
369 if (!type
->is_numeric()) {
370 _mesa_glsl_error(loc
, state
,
371 "Operands to arithmetic operators must be numeric");
372 return glsl_type::error_type
;
379 * \brief Return the result type of a bit-logic operation.
381 * If the given types to the bit-logic operator are invalid, return
382 * glsl_type::error_type.
384 * \param type_a Type of LHS of bit-logic op
385 * \param type_b Type of RHS of bit-logic op
387 static const struct glsl_type
*
388 bit_logic_result_type(const struct glsl_type
*type_a
,
389 const struct glsl_type
*type_b
,
391 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
393 if (!state
->check_bitwise_operations_allowed(loc
)) {
394 return glsl_type::error_type
;
397 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
399 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
400 * (|). The operands must be of type signed or unsigned integers or
403 if (!type_a
->is_integer()) {
404 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
405 ast_expression::operator_string(op
));
406 return glsl_type::error_type
;
408 if (!type_b
->is_integer()) {
409 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
410 ast_expression::operator_string(op
));
411 return glsl_type::error_type
;
414 /* "The fundamental types of the operands (signed or unsigned) must
417 if (type_a
->base_type
!= type_b
->base_type
) {
418 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
419 "base type", ast_expression::operator_string(op
));
420 return glsl_type::error_type
;
423 /* "The operands cannot be vectors of differing size." */
424 if (type_a
->is_vector() &&
425 type_b
->is_vector() &&
426 type_a
->vector_elements
!= type_b
->vector_elements
) {
427 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
428 "different sizes", ast_expression::operator_string(op
));
429 return glsl_type::error_type
;
432 /* "If one operand is a scalar and the other a vector, the scalar is
433 * applied component-wise to the vector, resulting in the same type as
434 * the vector. The fundamental types of the operands [...] will be the
435 * resulting fundamental type."
437 if (type_a
->is_scalar())
443 static const struct glsl_type
*
444 modulus_result_type(const struct glsl_type
*type_a
,
445 const struct glsl_type
*type_b
,
446 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
448 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
449 return glsl_type::error_type
;
452 /* From GLSL 1.50 spec, page 56:
453 * "The operator modulus (%) operates on signed or unsigned integers or
454 * integer vectors. The operand types must both be signed or both be
457 if (!type_a
->is_integer()) {
458 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
459 return glsl_type::error_type
;
461 if (!type_b
->is_integer()) {
462 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
463 return glsl_type::error_type
;
465 if (type_a
->base_type
!= type_b
->base_type
) {
466 _mesa_glsl_error(loc
, state
,
467 "operands of %% must have the same base type");
468 return glsl_type::error_type
;
471 /* "The operands cannot be vectors of differing size. If one operand is
472 * a scalar and the other vector, then the scalar is applied component-
473 * wise to the vector, resulting in the same type as the vector. If both
474 * are vectors of the same size, the result is computed component-wise."
476 if (type_a
->is_vector()) {
477 if (!type_b
->is_vector()
478 || (type_a
->vector_elements
== type_b
->vector_elements
))
483 /* "The operator modulus (%) is not defined for any other data types
484 * (non-integer types)."
486 _mesa_glsl_error(loc
, state
, "type mismatch");
487 return glsl_type::error_type
;
491 static const struct glsl_type
*
492 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
493 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
495 const glsl_type
*type_a
= value_a
->type
;
496 const glsl_type
*type_b
= value_b
->type
;
498 /* From GLSL 1.50 spec, page 56:
499 * "The relational operators greater than (>), less than (<), greater
500 * than or equal (>=), and less than or equal (<=) operate only on
501 * scalar integer and scalar floating-point expressions."
503 if (!type_a
->is_numeric()
504 || !type_b
->is_numeric()
505 || !type_a
->is_scalar()
506 || !type_b
->is_scalar()) {
507 _mesa_glsl_error(loc
, state
,
508 "Operands to relational operators must be scalar and "
510 return glsl_type::error_type
;
513 /* "Either the operands' types must match, or the conversions from
514 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
515 * operand, after which the types must match."
517 if (!apply_implicit_conversion(type_a
, value_b
, state
)
518 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
519 _mesa_glsl_error(loc
, state
,
520 "Could not implicitly convert operands to "
521 "relational operator");
522 return glsl_type::error_type
;
524 type_a
= value_a
->type
;
525 type_b
= value_b
->type
;
527 if (type_a
->base_type
!= type_b
->base_type
) {
528 _mesa_glsl_error(loc
, state
, "base type mismatch");
529 return glsl_type::error_type
;
532 /* "The result is scalar Boolean."
534 return glsl_type::bool_type
;
538 * \brief Return the result type of a bit-shift operation.
540 * If the given types to the bit-shift operator are invalid, return
541 * glsl_type::error_type.
543 * \param type_a Type of LHS of bit-shift op
544 * \param type_b Type of RHS of bit-shift op
546 static const struct glsl_type
*
547 shift_result_type(const struct glsl_type
*type_a
,
548 const struct glsl_type
*type_b
,
550 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
552 if (!state
->check_bitwise_operations_allowed(loc
)) {
553 return glsl_type::error_type
;
556 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
558 * "The shift operators (<<) and (>>). For both operators, the operands
559 * must be signed or unsigned integers or integer vectors. One operand
560 * can be signed while the other is unsigned."
562 if (!type_a
->is_integer()) {
563 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
564 "integer vector", ast_expression::operator_string(op
));
565 return glsl_type::error_type
;
568 if (!type_b
->is_integer()) {
569 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
570 "integer vector", ast_expression::operator_string(op
));
571 return glsl_type::error_type
;
574 /* "If the first operand is a scalar, the second operand has to be
577 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
578 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
579 "second must be scalar as well",
580 ast_expression::operator_string(op
));
581 return glsl_type::error_type
;
584 /* If both operands are vectors, check that they have same number of
587 if (type_a
->is_vector() &&
588 type_b
->is_vector() &&
589 type_a
->vector_elements
!= type_b
->vector_elements
) {
590 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
591 "have same number of elements",
592 ast_expression::operator_string(op
));
593 return glsl_type::error_type
;
596 /* "In all cases, the resulting type will be the same type as the left
603 * Validates that a value can be assigned to a location with a specified type
605 * Validates that \c rhs can be assigned to some location. If the types are
606 * not an exact match but an automatic conversion is possible, \c rhs will be
610 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
611 * Otherwise the actual RHS to be assigned will be returned. This may be
612 * \c rhs, or it may be \c rhs after some type conversion.
615 * In addition to being used for assignments, this function is used to
616 * type-check return values.
619 validate_assignment(struct _mesa_glsl_parse_state
*state
,
620 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
623 /* If there is already some error in the RHS, just return it. Anything
624 * else will lead to an avalanche of error message back to the user.
626 if (rhs
->type
->is_error())
629 /* If the types are identical, the assignment can trivially proceed.
631 if (rhs
->type
== lhs_type
)
634 /* If the array element types are the same and the size of the LHS is zero,
635 * the assignment is okay for initializers embedded in variable
638 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
639 * is handled by ir_dereference::is_lvalue.
641 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
642 && (lhs_type
->element_type() == rhs
->type
->element_type())
643 && (lhs_type
->array_size() == 0)) {
647 /* Check for implicit conversion in GLSL 1.20 */
648 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
649 if (rhs
->type
== lhs_type
)
657 mark_whole_array_access(ir_rvalue
*access
)
659 ir_dereference_variable
*deref
= access
->as_dereference_variable();
661 if (deref
&& deref
->var
) {
662 deref
->var
->max_array_access
= deref
->type
->length
- 1;
667 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
668 const char *non_lvalue_description
,
669 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
673 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
675 ir_variable
*lhs_var
= lhs
->variable_referenced();
677 lhs_var
->assigned
= true;
679 if (!error_emitted
) {
680 if (non_lvalue_description
!= NULL
) {
681 _mesa_glsl_error(&lhs_loc
, state
,
683 non_lvalue_description
);
684 error_emitted
= true;
685 } else if (lhs
->variable_referenced() != NULL
686 && lhs
->variable_referenced()->read_only
) {
687 _mesa_glsl_error(&lhs_loc
, state
,
688 "assignment to read-only variable '%s'",
689 lhs
->variable_referenced()->name
);
690 error_emitted
= true;
692 } else if (lhs
->type
->is_array() &&
693 !state
->check_version(120, 300, &lhs_loc
,
694 "whole array assignment forbidden")) {
695 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
697 * "Other binary or unary expressions, non-dereferenced
698 * arrays, function names, swizzles with repeated fields,
699 * and constants cannot be l-values."
701 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
703 error_emitted
= true;
704 } else if (!lhs
->is_lvalue()) {
705 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
706 error_emitted
= true;
711 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
712 if (new_rhs
== NULL
) {
713 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
717 /* If the LHS array was not declared with a size, it takes it size from
718 * the RHS. If the LHS is an l-value and a whole array, it must be a
719 * dereference of a variable. Any other case would require that the LHS
720 * is either not an l-value or not a whole array.
722 if (lhs
->type
->array_size() == 0) {
723 ir_dereference
*const d
= lhs
->as_dereference();
727 ir_variable
*const var
= d
->variable_referenced();
731 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
732 /* FINISHME: This should actually log the location of the RHS. */
733 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
735 var
->max_array_access
);
738 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
739 rhs
->type
->array_size());
742 mark_whole_array_access(rhs
);
743 mark_whole_array_access(lhs
);
746 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
747 * but not post_inc) need the converted assigned value as an rvalue
748 * to handle things like:
752 * So we always just store the computed value being assigned to a
753 * temporary and return a deref of that temporary. If the rvalue
754 * ends up not being used, the temp will get copy-propagated out.
756 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
758 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
759 instructions
->push_tail(var
);
760 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
761 deref_var
= new(ctx
) ir_dereference_variable(var
);
764 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
766 return new(ctx
) ir_dereference_variable(var
);
770 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
772 void *ctx
= ralloc_parent(lvalue
);
775 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
777 instructions
->push_tail(var
);
778 var
->mode
= ir_var_auto
;
780 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
783 return new(ctx
) ir_dereference_variable(var
);
788 ast_node::hir(exec_list
*instructions
,
789 struct _mesa_glsl_parse_state
*state
)
798 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
801 ir_rvalue
*cmp
= NULL
;
803 if (operation
== ir_binop_all_equal
)
804 join_op
= ir_binop_logic_and
;
806 join_op
= ir_binop_logic_or
;
808 switch (op0
->type
->base_type
) {
809 case GLSL_TYPE_FLOAT
:
813 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
815 case GLSL_TYPE_ARRAY
: {
816 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
817 ir_rvalue
*e0
, *e1
, *result
;
819 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
820 new(mem_ctx
) ir_constant(i
));
821 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
822 new(mem_ctx
) ir_constant(i
));
823 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
826 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
832 mark_whole_array_access(op0
);
833 mark_whole_array_access(op1
);
837 case GLSL_TYPE_STRUCT
: {
838 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
839 ir_rvalue
*e0
, *e1
, *result
;
840 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
842 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
844 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
846 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
849 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
857 case GLSL_TYPE_ERROR
:
859 case GLSL_TYPE_SAMPLER
:
860 /* I assume a comparison of a struct containing a sampler just
861 * ignores the sampler present in the type.
866 assert(!"Should not get here.");
871 cmp
= new(mem_ctx
) ir_constant(true);
876 /* For logical operations, we want to ensure that the operands are
877 * scalar booleans. If it isn't, emit an error and return a constant
878 * boolean to avoid triggering cascading error messages.
881 get_scalar_boolean_operand(exec_list
*instructions
,
882 struct _mesa_glsl_parse_state
*state
,
883 ast_expression
*parent_expr
,
885 const char *operand_name
,
888 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
890 ir_rvalue
*val
= expr
->hir(instructions
, state
);
892 if (val
->type
->is_boolean() && val
->type
->is_scalar())
895 if (!*error_emitted
) {
896 YYLTYPE loc
= expr
->get_location();
897 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
899 parent_expr
->operator_string(parent_expr
->oper
));
900 *error_emitted
= true;
903 return new(ctx
) ir_constant(true);
907 * If name refers to a builtin array whose maximum allowed size is less than
908 * size, report an error and return true. Otherwise return false.
911 check_builtin_array_max_size(const char *name
, unsigned size
,
912 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
914 if ((strcmp("gl_TexCoord", name
) == 0)
915 && (size
> state
->Const
.MaxTextureCoords
)) {
916 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
918 * "The size [of gl_TexCoord] can be at most
919 * gl_MaxTextureCoords."
921 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
922 "be larger than gl_MaxTextureCoords (%u)\n",
923 state
->Const
.MaxTextureCoords
);
925 } else if (strcmp("gl_ClipDistance", name
) == 0
926 && size
> state
->Const
.MaxClipPlanes
) {
927 /* From section 7.1 (Vertex Shader Special Variables) of the
930 * "The gl_ClipDistance array is predeclared as unsized and
931 * must be sized by the shader either redeclaring it with a
932 * size or indexing it only with integral constant
933 * expressions. ... The size can be at most
934 * gl_MaxClipDistances."
936 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
937 "be larger than gl_MaxClipDistances (%u)\n",
938 state
->Const
.MaxClipPlanes
);
945 * Create the constant 1, of a which is appropriate for incrementing and
946 * decrementing values of the given GLSL type. For example, if type is vec4,
947 * this creates a constant value of 1.0 having type float.
949 * If the given type is invalid for increment and decrement operators, return
950 * a floating point 1--the error will be detected later.
953 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
955 switch (type
->base_type
) {
957 return new(ctx
) ir_constant((unsigned) 1);
959 return new(ctx
) ir_constant(1);
961 case GLSL_TYPE_FLOAT
:
962 return new(ctx
) ir_constant(1.0f
);
967 ast_expression::hir(exec_list
*instructions
,
968 struct _mesa_glsl_parse_state
*state
)
971 static const int operations
[AST_NUM_OPERATORS
] = {
972 -1, /* ast_assign doesn't convert to ir_expression. */
973 -1, /* ast_plus doesn't convert to ir_expression. */
997 /* Note: The following block of expression types actually convert
998 * to multiple IR instructions.
1000 ir_binop_mul
, /* ast_mul_assign */
1001 ir_binop_div
, /* ast_div_assign */
1002 ir_binop_mod
, /* ast_mod_assign */
1003 ir_binop_add
, /* ast_add_assign */
1004 ir_binop_sub
, /* ast_sub_assign */
1005 ir_binop_lshift
, /* ast_ls_assign */
1006 ir_binop_rshift
, /* ast_rs_assign */
1007 ir_binop_bit_and
, /* ast_and_assign */
1008 ir_binop_bit_xor
, /* ast_xor_assign */
1009 ir_binop_bit_or
, /* ast_or_assign */
1011 -1, /* ast_conditional doesn't convert to ir_expression. */
1012 ir_binop_add
, /* ast_pre_inc. */
1013 ir_binop_sub
, /* ast_pre_dec. */
1014 ir_binop_add
, /* ast_post_inc. */
1015 ir_binop_sub
, /* ast_post_dec. */
1016 -1, /* ast_field_selection doesn't conv to ir_expression. */
1017 -1, /* ast_array_index doesn't convert to ir_expression. */
1018 -1, /* ast_function_call doesn't conv to ir_expression. */
1019 -1, /* ast_identifier doesn't convert to ir_expression. */
1020 -1, /* ast_int_constant doesn't convert to ir_expression. */
1021 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1022 -1, /* ast_float_constant doesn't conv to ir_expression. */
1023 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1024 -1, /* ast_sequence doesn't convert to ir_expression. */
1026 ir_rvalue
*result
= NULL
;
1028 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1029 bool error_emitted
= false;
1032 loc
= this->get_location();
1034 switch (this->oper
) {
1036 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1037 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1039 result
= do_assignment(instructions
, state
,
1040 this->subexpressions
[0]->non_lvalue_description
,
1041 op
[0], op
[1], false,
1042 this->subexpressions
[0]->get_location());
1043 error_emitted
= result
->type
->is_error();
1048 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1050 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1052 error_emitted
= type
->is_error();
1058 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1060 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1062 error_emitted
= type
->is_error();
1064 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1072 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1073 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1075 type
= arithmetic_result_type(op
[0], op
[1],
1076 (this->oper
== ast_mul
),
1078 error_emitted
= type
->is_error();
1080 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1085 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1086 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1088 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1090 assert(operations
[this->oper
] == ir_binop_mod
);
1092 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1094 error_emitted
= type
->is_error();
1099 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1100 error_emitted
= true;
1103 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1104 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1105 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1107 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1109 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1116 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1117 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1119 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1121 /* The relational operators must either generate an error or result
1122 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1124 assert(type
->is_error()
1125 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1126 && type
->is_scalar()));
1128 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1130 error_emitted
= type
->is_error();
1135 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1136 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1138 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1140 * "The equality operators equal (==), and not equal (!=)
1141 * operate on all types. They result in a scalar Boolean. If
1142 * the operand types do not match, then there must be a
1143 * conversion from Section 4.1.10 "Implicit Conversions"
1144 * applied to one operand that can make them match, in which
1145 * case this conversion is done."
1147 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1148 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1149 || (op
[0]->type
!= op
[1]->type
)) {
1150 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1151 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1152 error_emitted
= true;
1153 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1154 !state
->check_version(120, 300, &loc
,
1155 "array comparisons forbidden")) {
1156 error_emitted
= true;
1159 if (error_emitted
) {
1160 result
= new(ctx
) ir_constant(false);
1162 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1163 assert(result
->type
== glsl_type::bool_type
);
1170 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1171 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1172 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1174 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1176 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1180 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1182 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1183 error_emitted
= true;
1186 if (!op
[0]->type
->is_integer()) {
1187 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1188 error_emitted
= true;
1191 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1192 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1195 case ast_logic_and
: {
1196 exec_list rhs_instructions
;
1197 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1198 "LHS", &error_emitted
);
1199 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1200 "RHS", &error_emitted
);
1202 if (rhs_instructions
.is_empty()) {
1203 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1204 type
= result
->type
;
1206 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1209 instructions
->push_tail(tmp
);
1211 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1212 instructions
->push_tail(stmt
);
1214 stmt
->then_instructions
.append_list(&rhs_instructions
);
1215 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1216 ir_assignment
*const then_assign
=
1217 new(ctx
) ir_assignment(then_deref
, op
[1]);
1218 stmt
->then_instructions
.push_tail(then_assign
);
1220 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1221 ir_assignment
*const else_assign
=
1222 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1223 stmt
->else_instructions
.push_tail(else_assign
);
1225 result
= new(ctx
) ir_dereference_variable(tmp
);
1231 case ast_logic_or
: {
1232 exec_list rhs_instructions
;
1233 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1234 "LHS", &error_emitted
);
1235 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1236 "RHS", &error_emitted
);
1238 if (rhs_instructions
.is_empty()) {
1239 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1240 type
= result
->type
;
1242 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1245 instructions
->push_tail(tmp
);
1247 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1248 instructions
->push_tail(stmt
);
1250 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1251 ir_assignment
*const then_assign
=
1252 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1253 stmt
->then_instructions
.push_tail(then_assign
);
1255 stmt
->else_instructions
.append_list(&rhs_instructions
);
1256 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1257 ir_assignment
*const else_assign
=
1258 new(ctx
) ir_assignment(else_deref
, op
[1]);
1259 stmt
->else_instructions
.push_tail(else_assign
);
1261 result
= new(ctx
) ir_dereference_variable(tmp
);
1268 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1270 * "The logical binary operators and (&&), or ( | | ), and
1271 * exclusive or (^^). They operate only on two Boolean
1272 * expressions and result in a Boolean expression."
1274 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1276 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1279 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1284 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1285 "operand", &error_emitted
);
1287 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1291 case ast_mul_assign
:
1292 case ast_div_assign
:
1293 case ast_add_assign
:
1294 case ast_sub_assign
: {
1295 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1296 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1298 type
= arithmetic_result_type(op
[0], op
[1],
1299 (this->oper
== ast_mul_assign
),
1302 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1305 result
= do_assignment(instructions
, state
,
1306 this->subexpressions
[0]->non_lvalue_description
,
1307 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1308 this->subexpressions
[0]->get_location());
1309 error_emitted
= (op
[0]->type
->is_error());
1311 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1312 * explicitly test for this because none of the binary expression
1313 * operators allow array operands either.
1319 case ast_mod_assign
: {
1320 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1321 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1323 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1325 assert(operations
[this->oper
] == ir_binop_mod
);
1327 ir_rvalue
*temp_rhs
;
1328 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1331 result
= do_assignment(instructions
, state
,
1332 this->subexpressions
[0]->non_lvalue_description
,
1333 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1334 this->subexpressions
[0]->get_location());
1335 error_emitted
= type
->is_error();
1340 case ast_rs_assign
: {
1341 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1342 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1343 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1345 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1346 type
, op
[0], op
[1]);
1347 result
= do_assignment(instructions
, state
,
1348 this->subexpressions
[0]->non_lvalue_description
,
1349 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1350 this->subexpressions
[0]->get_location());
1351 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1355 case ast_and_assign
:
1356 case ast_xor_assign
:
1357 case ast_or_assign
: {
1358 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1359 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1360 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1362 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1363 type
, op
[0], op
[1]);
1364 result
= do_assignment(instructions
, state
,
1365 this->subexpressions
[0]->non_lvalue_description
,
1366 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1367 this->subexpressions
[0]->get_location());
1368 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1372 case ast_conditional
: {
1373 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1375 * "The ternary selection operator (?:). It operates on three
1376 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1377 * first expression, which must result in a scalar Boolean."
1379 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1380 "condition", &error_emitted
);
1382 /* The :? operator is implemented by generating an anonymous temporary
1383 * followed by an if-statement. The last instruction in each branch of
1384 * the if-statement assigns a value to the anonymous temporary. This
1385 * temporary is the r-value of the expression.
1387 exec_list then_instructions
;
1388 exec_list else_instructions
;
1390 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1391 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1393 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1395 * "The second and third expressions can be any type, as
1396 * long their types match, or there is a conversion in
1397 * Section 4.1.10 "Implicit Conversions" that can be applied
1398 * to one of the expressions to make their types match. This
1399 * resulting matching type is the type of the entire
1402 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1403 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1404 || (op
[1]->type
!= op
[2]->type
)) {
1405 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1407 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1408 "operator must have matching types.");
1409 error_emitted
= true;
1410 type
= glsl_type::error_type
;
1415 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1417 * "The second and third expressions must be the same type, but can
1418 * be of any type other than an array."
1420 if (type
->is_array() &&
1421 !state
->check_version(120, 300, &loc
,
1422 "Second and third operands of ?: operator "
1423 "cannot be arrays")) {
1424 error_emitted
= true;
1427 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1428 ir_constant
*then_val
= op
[1]->constant_expression_value();
1429 ir_constant
*else_val
= op
[2]->constant_expression_value();
1431 if (then_instructions
.is_empty()
1432 && else_instructions
.is_empty()
1433 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1434 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1436 ir_variable
*const tmp
=
1437 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1438 instructions
->push_tail(tmp
);
1440 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1441 instructions
->push_tail(stmt
);
1443 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1444 ir_dereference
*const then_deref
=
1445 new(ctx
) ir_dereference_variable(tmp
);
1446 ir_assignment
*const then_assign
=
1447 new(ctx
) ir_assignment(then_deref
, op
[1]);
1448 stmt
->then_instructions
.push_tail(then_assign
);
1450 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1451 ir_dereference
*const else_deref
=
1452 new(ctx
) ir_dereference_variable(tmp
);
1453 ir_assignment
*const else_assign
=
1454 new(ctx
) ir_assignment(else_deref
, op
[2]);
1455 stmt
->else_instructions
.push_tail(else_assign
);
1457 result
= new(ctx
) ir_dereference_variable(tmp
);
1464 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1465 ? "pre-increment operation" : "pre-decrement operation";
1467 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1468 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1470 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1472 ir_rvalue
*temp_rhs
;
1473 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1476 result
= do_assignment(instructions
, state
,
1477 this->subexpressions
[0]->non_lvalue_description
,
1478 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1479 this->subexpressions
[0]->get_location());
1480 error_emitted
= op
[0]->type
->is_error();
1485 case ast_post_dec
: {
1486 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1487 ? "post-increment operation" : "post-decrement operation";
1488 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1489 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1491 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1493 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1495 ir_rvalue
*temp_rhs
;
1496 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1499 /* Get a temporary of a copy of the lvalue before it's modified.
1500 * This may get thrown away later.
1502 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1504 (void)do_assignment(instructions
, state
,
1505 this->subexpressions
[0]->non_lvalue_description
,
1506 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1507 this->subexpressions
[0]->get_location());
1509 error_emitted
= op
[0]->type
->is_error();
1513 case ast_field_selection
:
1514 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1517 case ast_array_index
: {
1518 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1520 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1521 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1523 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1525 ir_rvalue
*const array
= op
[0];
1527 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1529 /* Do not use op[0] after this point. Use array.
1537 if (!array
->type
->is_array()
1538 && !array
->type
->is_matrix()
1539 && !array
->type
->is_vector()) {
1540 _mesa_glsl_error(& index_loc
, state
,
1541 "cannot dereference non-array / non-matrix / "
1543 error_emitted
= true;
1546 if (!op
[1]->type
->is_integer()) {
1547 _mesa_glsl_error(& index_loc
, state
,
1548 "array index must be integer type");
1549 error_emitted
= true;
1550 } else if (!op
[1]->type
->is_scalar()) {
1551 _mesa_glsl_error(& index_loc
, state
,
1552 "array index must be scalar");
1553 error_emitted
= true;
1556 /* If the array index is a constant expression and the array has a
1557 * declared size, ensure that the access is in-bounds. If the array
1558 * index is not a constant expression, ensure that the array has a
1561 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1562 if (const_index
!= NULL
) {
1563 const int idx
= const_index
->value
.i
[0];
1564 const char *type_name
;
1567 if (array
->type
->is_matrix()) {
1568 type_name
= "matrix";
1569 } else if (array
->type
->is_vector()) {
1570 type_name
= "vector";
1572 type_name
= "array";
1575 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1577 * "It is illegal to declare an array with a size, and then
1578 * later (in the same shader) index the same array with an
1579 * integral constant expression greater than or equal to the
1580 * declared size. It is also illegal to index an array with a
1581 * negative constant expression."
1583 if (array
->type
->is_matrix()) {
1584 if (array
->type
->row_type()->vector_elements
<= idx
) {
1585 bound
= array
->type
->row_type()->vector_elements
;
1587 } else if (array
->type
->is_vector()) {
1588 if (array
->type
->vector_elements
<= idx
) {
1589 bound
= array
->type
->vector_elements
;
1592 if ((array
->type
->array_size() > 0)
1593 && (array
->type
->array_size() <= idx
)) {
1594 bound
= array
->type
->array_size();
1599 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1601 error_emitted
= true;
1602 } else if (idx
< 0) {
1603 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1605 error_emitted
= true;
1608 if (array
->type
->is_array()) {
1609 /* If the array is a variable dereference, it dereferences the
1610 * whole array, by definition. Use this to get the variable.
1612 * FINISHME: Should some methods for getting / setting / testing
1613 * FINISHME: array access limits be added to ir_dereference?
1615 ir_variable
*const v
= array
->whole_variable_referenced();
1616 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
)) {
1617 v
->max_array_access
= idx
;
1619 /* Check whether this access will, as a side effect, implicitly
1620 * cause the size of a built-in array to be too large.
1622 if (check_builtin_array_max_size(v
->name
, idx
+1, loc
, state
))
1623 error_emitted
= true;
1626 } else if (array
->type
->array_size() == 0) {
1627 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1629 if (array
->type
->is_array()) {
1630 /* whole_variable_referenced can return NULL if the array is a
1631 * member of a structure. In this case it is safe to not update
1632 * the max_array_access field because it is never used for fields
1635 ir_variable
*v
= array
->whole_variable_referenced();
1637 v
->max_array_access
= array
->type
->array_size() - 1;
1641 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1643 * "Samplers aggregated into arrays within a shader (using square
1644 * brackets [ ]) can only be indexed with integral constant
1645 * expressions [...]."
1647 * This restriction was added in GLSL 1.30. Shaders using earlier version
1648 * of the language should not be rejected by the compiler front-end for
1649 * using this construct. This allows useful things such as using a loop
1650 * counter as the index to an array of samplers. If the loop in unrolled,
1651 * the code should compile correctly. Instead, emit a warning.
1653 if (array
->type
->is_array() &&
1654 array
->type
->element_type()->is_sampler() &&
1655 const_index
== NULL
) {
1657 if (!state
->is_version(130, 100)) {
1658 if (state
->es_shader
) {
1659 _mesa_glsl_warning(&loc
, state
,
1660 "sampler arrays indexed with non-constant "
1661 "expressions is optional in %s",
1662 state
->get_version_string());
1664 _mesa_glsl_warning(&loc
, state
,
1665 "sampler arrays indexed with non-constant "
1666 "expressions will be forbidden in GLSL 1.30 and "
1670 _mesa_glsl_error(&loc
, state
,
1671 "sampler arrays indexed with non-constant "
1672 "expressions is forbidden in GLSL 1.30 and "
1674 error_emitted
= true;
1679 result
->type
= glsl_type::error_type
;
1684 case ast_function_call
:
1685 /* Should *NEVER* get here. ast_function_call should always be handled
1686 * by ast_function_expression::hir.
1691 case ast_identifier
: {
1692 /* ast_identifier can appear several places in a full abstract syntax
1693 * tree. This particular use must be at location specified in the grammar
1694 * as 'variable_identifier'.
1697 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1701 result
= new(ctx
) ir_dereference_variable(var
);
1703 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1704 this->primary_expression
.identifier
);
1706 result
= ir_rvalue::error_value(ctx
);
1707 error_emitted
= true;
1712 case ast_int_constant
:
1713 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1716 case ast_uint_constant
:
1717 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1720 case ast_float_constant
:
1721 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1724 case ast_bool_constant
:
1725 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1728 case ast_sequence
: {
1729 /* It should not be possible to generate a sequence in the AST without
1730 * any expressions in it.
1732 assert(!this->expressions
.is_empty());
1734 /* The r-value of a sequence is the last expression in the sequence. If
1735 * the other expressions in the sequence do not have side-effects (and
1736 * therefore add instructions to the instruction list), they get dropped
1739 exec_node
*previous_tail_pred
= NULL
;
1740 YYLTYPE previous_operand_loc
= loc
;
1742 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1743 /* If one of the operands of comma operator does not generate any
1744 * code, we want to emit a warning. At each pass through the loop
1745 * previous_tail_pred will point to the last instruction in the
1746 * stream *before* processing the previous operand. Naturally,
1747 * instructions->tail_pred will point to the last instruction in the
1748 * stream *after* processing the previous operand. If the two
1749 * pointers match, then the previous operand had no effect.
1751 * The warning behavior here differs slightly from GCC. GCC will
1752 * only emit a warning if none of the left-hand operands have an
1753 * effect. However, it will emit a warning for each. I believe that
1754 * there are some cases in C (especially with GCC extensions) where
1755 * it is useful to have an intermediate step in a sequence have no
1756 * effect, but I don't think these cases exist in GLSL. Either way,
1757 * it would be a giant hassle to replicate that behavior.
1759 if (previous_tail_pred
== instructions
->tail_pred
) {
1760 _mesa_glsl_warning(&previous_operand_loc
, state
,
1761 "left-hand operand of comma expression has "
1765 /* tail_pred is directly accessed instead of using the get_tail()
1766 * method for performance reasons. get_tail() has extra code to
1767 * return NULL when the list is empty. We don't care about that
1768 * here, so using tail_pred directly is fine.
1770 previous_tail_pred
= instructions
->tail_pred
;
1771 previous_operand_loc
= ast
->get_location();
1773 result
= ast
->hir(instructions
, state
);
1776 /* Any errors should have already been emitted in the loop above.
1778 error_emitted
= true;
1782 type
= NULL
; /* use result->type, not type. */
1783 assert(result
!= NULL
);
1785 if (result
->type
->is_error() && !error_emitted
)
1786 _mesa_glsl_error(& loc
, state
, "type mismatch");
1793 ast_expression_statement::hir(exec_list
*instructions
,
1794 struct _mesa_glsl_parse_state
*state
)
1796 /* It is possible to have expression statements that don't have an
1797 * expression. This is the solitary semicolon:
1799 * for (i = 0; i < 5; i++)
1802 * In this case the expression will be NULL. Test for NULL and don't do
1803 * anything in that case.
1805 if (expression
!= NULL
)
1806 expression
->hir(instructions
, state
);
1808 /* Statements do not have r-values.
1815 ast_compound_statement::hir(exec_list
*instructions
,
1816 struct _mesa_glsl_parse_state
*state
)
1819 state
->symbols
->push_scope();
1821 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1822 ast
->hir(instructions
, state
);
1825 state
->symbols
->pop_scope();
1827 /* Compound statements do not have r-values.
1833 static const glsl_type
*
1834 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1835 struct _mesa_glsl_parse_state
*state
)
1837 unsigned length
= 0;
1839 /* From page 19 (page 25) of the GLSL 1.20 spec:
1841 * "Only one-dimensional arrays may be declared."
1843 if (base
->is_array()) {
1844 _mesa_glsl_error(loc
, state
,
1845 "invalid array of `%s' (only one-dimensional arrays "
1848 return glsl_type::error_type
;
1851 if (array_size
!= NULL
) {
1852 exec_list dummy_instructions
;
1853 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1854 YYLTYPE loc
= array_size
->get_location();
1857 if (!ir
->type
->is_integer()) {
1858 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1859 } else if (!ir
->type
->is_scalar()) {
1860 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1862 ir_constant
*const size
= ir
->constant_expression_value();
1865 _mesa_glsl_error(& loc
, state
, "array size must be a "
1866 "constant valued expression");
1867 } else if (size
->value
.i
[0] <= 0) {
1868 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1870 assert(size
->type
== ir
->type
);
1871 length
= size
->value
.u
[0];
1873 /* If the array size is const (and we've verified that
1874 * it is) then no instructions should have been emitted
1875 * when we converted it to HIR. If they were emitted,
1876 * then either the array size isn't const after all, or
1877 * we are emitting unnecessary instructions.
1879 assert(dummy_instructions
.is_empty());
1883 } else if (state
->es_shader
) {
1884 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1885 * array declarations have been removed from the language.
1887 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1888 "allowed in GLSL ES 1.00.");
1891 return glsl_type::get_array_instance(base
, length
);
1896 ast_type_specifier::glsl_type(const char **name
,
1897 struct _mesa_glsl_parse_state
*state
) const
1899 const struct glsl_type
*type
;
1901 type
= state
->symbols
->get_type(this->type_name
);
1902 *name
= this->type_name
;
1904 if (this->is_array
) {
1905 YYLTYPE loc
= this->get_location();
1906 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1914 * Determine whether a toplevel variable declaration declares a varying. This
1915 * function operates by examining the variable's mode and the shader target,
1916 * so it correctly identifies linkage variables regardless of whether they are
1917 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1919 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1920 * this function will produce undefined results.
1923 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1927 return var
->mode
== ir_var_out
;
1928 case fragment_shader
:
1929 return var
->mode
== ir_var_in
;
1931 return var
->mode
== ir_var_out
|| var
->mode
== ir_var_in
;
1937 * Matrix layout qualifiers are only allowed on certain types
1940 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1942 const glsl_type
*type
)
1944 if (!type
->is_matrix() && !type
->is_record()) {
1945 _mesa_glsl_error(loc
, state
,
1946 "uniform block layout qualifiers row_major and "
1947 "column_major can only be applied to matrix and "
1949 } else if (type
->is_record()) {
1950 /* We allow 'layout(row_major)' on structure types because it's the only
1951 * way to get row-major layouts on matrices contained in structures.
1953 _mesa_glsl_warning(loc
, state
,
1954 "uniform block layout qualifiers row_major and "
1955 "column_major applied to structure types is not "
1956 "strictly conformant and my be rejected by other "
1962 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1964 struct _mesa_glsl_parse_state
*state
,
1966 bool ubo_qualifiers_valid
,
1969 if (qual
->flags
.q
.invariant
) {
1971 _mesa_glsl_error(loc
, state
,
1972 "variable `%s' may not be redeclared "
1973 "`invariant' after being used",
1980 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1981 || qual
->flags
.q
.uniform
1982 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1985 if (qual
->flags
.q
.centroid
)
1988 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1989 var
->type
= glsl_type::error_type
;
1990 _mesa_glsl_error(loc
, state
,
1991 "`attribute' variables may not be declared in the "
1993 _mesa_glsl_shader_target_name(state
->target
));
1996 /* If there is no qualifier that changes the mode of the variable, leave
1997 * the setting alone.
1999 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2000 var
->mode
= ir_var_inout
;
2001 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
2002 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
2003 var
->mode
= ir_var_in
;
2004 else if (qual
->flags
.q
.out
2005 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
2006 var
->mode
= ir_var_out
;
2007 else if (qual
->flags
.q
.uniform
)
2008 var
->mode
= ir_var_uniform
;
2010 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
2011 /* This variable is being used to link data between shader stages (in
2012 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2013 * that is allowed for such purposes.
2015 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2017 * "The varying qualifier can be used only with the data types
2018 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2021 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2022 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2024 * "Fragment inputs can only be signed and unsigned integers and
2025 * integer vectors, float, floating-point vectors, matrices, or
2026 * arrays of these. Structures cannot be input.
2028 * Similar text exists in the section on vertex shader outputs.
2030 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2031 * 3.00 spec claims to allow structs as well. However, this is likely
2032 * an error, since section 11 of the spec ("Counting of Inputs and
2033 * Outputs") enumerates all possible types of interstage linkage
2034 * variables, and it does not mention structs.
2036 switch (var
->type
->get_scalar_type()->base_type
) {
2037 case GLSL_TYPE_FLOAT
:
2038 /* Ok in all GLSL versions */
2040 case GLSL_TYPE_UINT
:
2042 if (state
->is_version(130, 300))
2044 _mesa_glsl_error(loc
, state
,
2045 "varying variables must be of base type float in %s",
2046 state
->get_version_string());
2048 case GLSL_TYPE_STRUCT
:
2049 _mesa_glsl_error(loc
, state
,
2050 "varying variables may not be of type struct");
2053 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2058 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2059 switch (state
->target
) {
2061 if (var
->mode
== ir_var_out
)
2062 var
->invariant
= true;
2064 case geometry_shader
:
2065 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
2066 var
->invariant
= true;
2068 case fragment_shader
:
2069 if (var
->mode
== ir_var_in
)
2070 var
->invariant
= true;
2075 if (qual
->flags
.q
.flat
)
2076 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2077 else if (qual
->flags
.q
.noperspective
)
2078 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2079 else if (qual
->flags
.q
.smooth
)
2080 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2082 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2084 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
2085 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_out
) &&
2086 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_in
)) {
2087 _mesa_glsl_error(loc
, state
,
2088 "interpolation qualifier `%s' can only be applied to "
2089 "vertex shader outputs and fragment shader inputs.",
2090 var
->interpolation_string());
2093 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2094 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2095 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2096 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2097 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2098 ? "origin_upper_left" : "pixel_center_integer";
2100 _mesa_glsl_error(loc
, state
,
2101 "layout qualifier `%s' can only be applied to "
2102 "fragment shader input `gl_FragCoord'",
2106 if (qual
->flags
.q
.explicit_location
) {
2107 const bool global_scope
= (state
->current_function
== NULL
);
2109 const char *string
= "";
2111 /* In the vertex shader only shader inputs can be given explicit
2114 * In the fragment shader only shader outputs can be given explicit
2117 switch (state
->target
) {
2119 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
2125 case geometry_shader
:
2126 _mesa_glsl_error(loc
, state
,
2127 "geometry shader variables cannot be given "
2128 "explicit locations\n");
2131 case fragment_shader
:
2132 if (!global_scope
|| (var
->mode
!= ir_var_out
)) {
2140 _mesa_glsl_error(loc
, state
,
2141 "only %s shader %s variables can be given an "
2142 "explicit location\n",
2143 _mesa_glsl_shader_target_name(state
->target
),
2146 var
->explicit_location
= true;
2148 /* This bit of silliness is needed because invalid explicit locations
2149 * are supposed to be flagged during linking. Small negative values
2150 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2151 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2152 * The linker needs to be able to differentiate these cases. This
2153 * ensures that negative values stay negative.
2155 if (qual
->location
>= 0) {
2156 var
->location
= (state
->target
== vertex_shader
)
2157 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2158 : (qual
->location
+ FRAG_RESULT_DATA0
);
2160 var
->location
= qual
->location
;
2163 if (qual
->flags
.q
.explicit_index
) {
2164 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2165 * Layout Qualifiers):
2167 * "It is also a compile-time error if a fragment shader
2168 * sets a layout index to less than 0 or greater than 1."
2170 * Older specifications don't mandate a behavior; we take
2171 * this as a clarification and always generate the error.
2173 if (qual
->index
< 0 || qual
->index
> 1) {
2174 _mesa_glsl_error(loc
, state
,
2175 "explicit index may only be 0 or 1\n");
2177 var
->explicit_index
= true;
2178 var
->index
= qual
->index
;
2182 } else if (qual
->flags
.q
.explicit_index
) {
2183 _mesa_glsl_error(loc
, state
,
2184 "explicit index requires explicit location\n");
2187 /* Does the declaration use the 'layout' keyword?
2189 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2190 || qual
->flags
.q
.origin_upper_left
2191 || qual
->flags
.q
.explicit_location
; /* no need for index since it relies on location */
2193 /* Does the declaration use the deprecated 'attribute' or 'varying'
2196 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2197 || qual
->flags
.q
.varying
;
2199 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2200 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2201 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2202 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2203 * These extensions and all following extensions that add the 'layout'
2204 * keyword have been modified to require the use of 'in' or 'out'.
2206 * The following extension do not allow the deprecated keywords:
2208 * GL_AMD_conservative_depth
2209 * GL_ARB_conservative_depth
2210 * GL_ARB_gpu_shader5
2211 * GL_ARB_separate_shader_objects
2212 * GL_ARB_tesselation_shader
2213 * GL_ARB_transform_feedback3
2214 * GL_ARB_uniform_buffer_object
2216 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2217 * allow layout with the deprecated keywords.
2219 const bool relaxed_layout_qualifier_checking
=
2220 state
->ARB_fragment_coord_conventions_enable
;
2222 if (uses_layout
&& uses_deprecated_qualifier
) {
2223 if (relaxed_layout_qualifier_checking
) {
2224 _mesa_glsl_warning(loc
, state
,
2225 "`layout' qualifier may not be used with "
2226 "`attribute' or `varying'");
2228 _mesa_glsl_error(loc
, state
,
2229 "`layout' qualifier may not be used with "
2230 "`attribute' or `varying'");
2234 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2235 * AMD_conservative_depth.
2237 int depth_layout_count
= qual
->flags
.q
.depth_any
2238 + qual
->flags
.q
.depth_greater
2239 + qual
->flags
.q
.depth_less
2240 + qual
->flags
.q
.depth_unchanged
;
2241 if (depth_layout_count
> 0
2242 && !state
->AMD_conservative_depth_enable
2243 && !state
->ARB_conservative_depth_enable
) {
2244 _mesa_glsl_error(loc
, state
,
2245 "extension GL_AMD_conservative_depth or "
2246 "GL_ARB_conservative_depth must be enabled "
2247 "to use depth layout qualifiers");
2248 } else if (depth_layout_count
> 0
2249 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2250 _mesa_glsl_error(loc
, state
,
2251 "depth layout qualifiers can be applied only to "
2253 } else if (depth_layout_count
> 1
2254 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2255 _mesa_glsl_error(loc
, state
,
2256 "at most one depth layout qualifier can be applied to "
2259 if (qual
->flags
.q
.depth_any
)
2260 var
->depth_layout
= ir_depth_layout_any
;
2261 else if (qual
->flags
.q
.depth_greater
)
2262 var
->depth_layout
= ir_depth_layout_greater
;
2263 else if (qual
->flags
.q
.depth_less
)
2264 var
->depth_layout
= ir_depth_layout_less
;
2265 else if (qual
->flags
.q
.depth_unchanged
)
2266 var
->depth_layout
= ir_depth_layout_unchanged
;
2268 var
->depth_layout
= ir_depth_layout_none
;
2270 if (qual
->flags
.q
.std140
||
2271 qual
->flags
.q
.packed
||
2272 qual
->flags
.q
.shared
) {
2273 _mesa_glsl_error(loc
, state
,
2274 "uniform block layout qualifiers std140, packed, and "
2275 "shared can only be applied to uniform blocks, not "
2279 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2280 if (!ubo_qualifiers_valid
) {
2281 _mesa_glsl_error(loc
, state
,
2282 "uniform block layout qualifiers row_major and "
2283 "column_major can only be applied to uniform block "
2286 validate_matrix_layout_for_type(state
, loc
, var
->type
);
2291 * Get the variable that is being redeclared by this declaration
2293 * Semantic checks to verify the validity of the redeclaration are also
2294 * performed. If semantic checks fail, compilation error will be emitted via
2295 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2298 * A pointer to an existing variable in the current scope if the declaration
2299 * is a redeclaration, \c NULL otherwise.
2302 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2303 struct _mesa_glsl_parse_state
*state
)
2305 /* Check if this declaration is actually a re-declaration, either to
2306 * resize an array or add qualifiers to an existing variable.
2308 * This is allowed for variables in the current scope, or when at
2309 * global scope (for built-ins in the implicit outer scope).
2311 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2312 if (earlier
== NULL
||
2313 (state
->current_function
!= NULL
&&
2314 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2319 YYLTYPE loc
= decl
->get_location();
2321 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2323 * "It is legal to declare an array without a size and then
2324 * later re-declare the same name as an array of the same
2325 * type and specify a size."
2327 if ((earlier
->type
->array_size() == 0)
2328 && var
->type
->is_array()
2329 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2330 /* FINISHME: This doesn't match the qualifiers on the two
2331 * FINISHME: declarations. It's not 100% clear whether this is
2332 * FINISHME: required or not.
2335 const unsigned size
= unsigned(var
->type
->array_size());
2336 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2337 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2338 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2340 earlier
->max_array_access
);
2343 earlier
->type
= var
->type
;
2346 } else if (state
->ARB_fragment_coord_conventions_enable
2347 && strcmp(var
->name
, "gl_FragCoord") == 0
2348 && earlier
->type
== var
->type
2349 && earlier
->mode
== var
->mode
) {
2350 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2353 earlier
->origin_upper_left
= var
->origin_upper_left
;
2354 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2356 /* According to section 4.3.7 of the GLSL 1.30 spec,
2357 * the following built-in varaibles can be redeclared with an
2358 * interpolation qualifier:
2361 * * gl_FrontSecondaryColor
2362 * * gl_BackSecondaryColor
2364 * * gl_SecondaryColor
2366 } else if (state
->is_version(130, 0)
2367 && (strcmp(var
->name
, "gl_FrontColor") == 0
2368 || strcmp(var
->name
, "gl_BackColor") == 0
2369 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2370 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2371 || strcmp(var
->name
, "gl_Color") == 0
2372 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2373 && earlier
->type
== var
->type
2374 && earlier
->mode
== var
->mode
) {
2375 earlier
->interpolation
= var
->interpolation
;
2377 /* Layout qualifiers for gl_FragDepth. */
2378 } else if ((state
->AMD_conservative_depth_enable
||
2379 state
->ARB_conservative_depth_enable
)
2380 && strcmp(var
->name
, "gl_FragDepth") == 0
2381 && earlier
->type
== var
->type
2382 && earlier
->mode
== var
->mode
) {
2384 /** From the AMD_conservative_depth spec:
2385 * Within any shader, the first redeclarations of gl_FragDepth
2386 * must appear before any use of gl_FragDepth.
2388 if (earlier
->used
) {
2389 _mesa_glsl_error(&loc
, state
,
2390 "the first redeclaration of gl_FragDepth "
2391 "must appear before any use of gl_FragDepth");
2394 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2395 if (earlier
->depth_layout
!= ir_depth_layout_none
2396 && earlier
->depth_layout
!= var
->depth_layout
) {
2397 _mesa_glsl_error(&loc
, state
,
2398 "gl_FragDepth: depth layout is declared here "
2399 "as '%s, but it was previously declared as "
2401 depth_layout_string(var
->depth_layout
),
2402 depth_layout_string(earlier
->depth_layout
));
2405 earlier
->depth_layout
= var
->depth_layout
;
2408 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2415 * Generate the IR for an initializer in a variable declaration
2418 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2419 ast_fully_specified_type
*type
,
2420 exec_list
*initializer_instructions
,
2421 struct _mesa_glsl_parse_state
*state
)
2423 ir_rvalue
*result
= NULL
;
2425 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2427 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2429 * "All uniform variables are read-only and are initialized either
2430 * directly by an application via API commands, or indirectly by
2433 if (var
->mode
== ir_var_uniform
) {
2434 state
->check_version(120, 0, &initializer_loc
,
2435 "cannot initialize uniforms");
2438 if (var
->type
->is_sampler()) {
2439 _mesa_glsl_error(& initializer_loc
, state
,
2440 "cannot initialize samplers");
2443 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2444 _mesa_glsl_error(& initializer_loc
, state
,
2445 "cannot initialize %s shader input / %s",
2446 _mesa_glsl_shader_target_name(state
->target
),
2447 (state
->target
== vertex_shader
)
2448 ? "attribute" : "varying");
2451 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2452 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2455 /* Calculate the constant value if this is a const or uniform
2458 if (type
->qualifier
.flags
.q
.constant
2459 || type
->qualifier
.flags
.q
.uniform
) {
2460 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2461 if (new_rhs
!= NULL
) {
2464 ir_constant
*constant_value
= rhs
->constant_expression_value();
2465 if (!constant_value
) {
2466 _mesa_glsl_error(& initializer_loc
, state
,
2467 "initializer of %s variable `%s' must be a "
2468 "constant expression",
2469 (type
->qualifier
.flags
.q
.constant
)
2470 ? "const" : "uniform",
2472 if (var
->type
->is_numeric()) {
2473 /* Reduce cascading errors. */
2474 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2477 rhs
= constant_value
;
2478 var
->constant_value
= constant_value
;
2481 _mesa_glsl_error(&initializer_loc
, state
,
2482 "initializer of type %s cannot be assigned to "
2483 "variable of type %s",
2484 rhs
->type
->name
, var
->type
->name
);
2485 if (var
->type
->is_numeric()) {
2486 /* Reduce cascading errors. */
2487 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2492 if (rhs
&& !rhs
->type
->is_error()) {
2493 bool temp
= var
->read_only
;
2494 if (type
->qualifier
.flags
.q
.constant
)
2495 var
->read_only
= false;
2497 /* Never emit code to initialize a uniform.
2499 const glsl_type
*initializer_type
;
2500 if (!type
->qualifier
.flags
.q
.uniform
) {
2501 result
= do_assignment(initializer_instructions
, state
,
2504 type
->get_location());
2505 initializer_type
= result
->type
;
2507 initializer_type
= rhs
->type
;
2509 var
->constant_initializer
= rhs
->constant_expression_value();
2510 var
->has_initializer
= true;
2512 /* If the declared variable is an unsized array, it must inherrit
2513 * its full type from the initializer. A declaration such as
2515 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2519 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2521 * The assignment generated in the if-statement (below) will also
2522 * automatically handle this case for non-uniforms.
2524 * If the declared variable is not an array, the types must
2525 * already match exactly. As a result, the type assignment
2526 * here can be done unconditionally. For non-uniforms the call
2527 * to do_assignment can change the type of the initializer (via
2528 * the implicit conversion rules). For uniforms the initializer
2529 * must be a constant expression, and the type of that expression
2530 * was validated above.
2532 var
->type
= initializer_type
;
2534 var
->read_only
= temp
;
2541 ast_declarator_list::hir(exec_list
*instructions
,
2542 struct _mesa_glsl_parse_state
*state
)
2545 const struct glsl_type
*decl_type
;
2546 const char *type_name
= NULL
;
2547 ir_rvalue
*result
= NULL
;
2548 YYLTYPE loc
= this->get_location();
2550 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2552 * "To ensure that a particular output variable is invariant, it is
2553 * necessary to use the invariant qualifier. It can either be used to
2554 * qualify a previously declared variable as being invariant
2556 * invariant gl_Position; // make existing gl_Position be invariant"
2558 * In these cases the parser will set the 'invariant' flag in the declarator
2559 * list, and the type will be NULL.
2561 if (this->invariant
) {
2562 assert(this->type
== NULL
);
2564 if (state
->current_function
!= NULL
) {
2565 _mesa_glsl_error(& loc
, state
,
2566 "All uses of `invariant' keyword must be at global "
2570 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2571 assert(!decl
->is_array
);
2572 assert(decl
->array_size
== NULL
);
2573 assert(decl
->initializer
== NULL
);
2575 ir_variable
*const earlier
=
2576 state
->symbols
->get_variable(decl
->identifier
);
2577 if (earlier
== NULL
) {
2578 _mesa_glsl_error(& loc
, state
,
2579 "Undeclared variable `%s' cannot be marked "
2580 "invariant\n", decl
->identifier
);
2581 } else if ((state
->target
== vertex_shader
)
2582 && (earlier
->mode
!= ir_var_out
)) {
2583 _mesa_glsl_error(& loc
, state
,
2584 "`%s' cannot be marked invariant, vertex shader "
2585 "outputs only\n", decl
->identifier
);
2586 } else if ((state
->target
== fragment_shader
)
2587 && (earlier
->mode
!= ir_var_in
)) {
2588 _mesa_glsl_error(& loc
, state
,
2589 "`%s' cannot be marked invariant, fragment shader "
2590 "inputs only\n", decl
->identifier
);
2591 } else if (earlier
->used
) {
2592 _mesa_glsl_error(& loc
, state
,
2593 "variable `%s' may not be redeclared "
2594 "`invariant' after being used",
2597 earlier
->invariant
= true;
2601 /* Invariant redeclarations do not have r-values.
2606 assert(this->type
!= NULL
);
2607 assert(!this->invariant
);
2609 /* The type specifier may contain a structure definition. Process that
2610 * before any of the variable declarations.
2612 (void) this->type
->specifier
->hir(instructions
, state
);
2614 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2615 if (this->declarations
.is_empty()) {
2616 /* If there is no structure involved in the program text, there are two
2617 * possible scenarios:
2619 * - The program text contained something like 'vec4;'. This is an
2620 * empty declaration. It is valid but weird. Emit a warning.
2622 * - The program text contained something like 'S;' and 'S' is not the
2623 * name of a known structure type. This is both invalid and weird.
2626 * Note that if decl_type is NULL and there is a structure involved,
2627 * there must have been some sort of error with the structure. In this
2628 * case we assume that an error was already generated on this line of
2629 * code for the structure. There is no need to generate an additional,
2632 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2634 if (this->type
->specifier
->structure
== NULL
) {
2635 if (decl_type
!= NULL
) {
2636 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2638 _mesa_glsl_error(&loc
, state
,
2639 "invalid type `%s' in empty declaration",
2645 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2646 const struct glsl_type
*var_type
;
2649 /* FINISHME: Emit a warning if a variable declaration shadows a
2650 * FINISHME: declaration at a higher scope.
2653 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2654 if (type_name
!= NULL
) {
2655 _mesa_glsl_error(& loc
, state
,
2656 "invalid type `%s' in declaration of `%s'",
2657 type_name
, decl
->identifier
);
2659 _mesa_glsl_error(& loc
, state
,
2660 "invalid type in declaration of `%s'",
2666 if (decl
->is_array
) {
2667 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2669 if (var_type
->is_error())
2672 var_type
= decl_type
;
2675 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2677 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2679 * "Global variables can only use the qualifiers const,
2680 * attribute, uni form, or varying. Only one may be
2683 * Local variables can only use the qualifier const."
2685 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2686 * any extension that adds the 'layout' keyword.
2688 if (!state
->is_version(130, 300)
2689 && !state
->ARB_explicit_attrib_location_enable
2690 && !state
->ARB_fragment_coord_conventions_enable
) {
2691 if (this->type
->qualifier
.flags
.q
.out
) {
2692 _mesa_glsl_error(& loc
, state
,
2693 "`out' qualifier in declaration of `%s' "
2694 "only valid for function parameters in %s.",
2695 decl
->identifier
, state
->get_version_string());
2697 if (this->type
->qualifier
.flags
.q
.in
) {
2698 _mesa_glsl_error(& loc
, state
,
2699 "`in' qualifier in declaration of `%s' "
2700 "only valid for function parameters in %s.",
2701 decl
->identifier
, state
->get_version_string());
2703 /* FINISHME: Test for other invalid qualifiers. */
2706 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2707 & loc
, this->ubo_qualifiers_valid
, false);
2709 if (this->type
->qualifier
.flags
.q
.invariant
) {
2710 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2711 var
->mode
== ir_var_inout
)) {
2712 /* FINISHME: Note that this doesn't work for invariant on
2713 * a function signature outval
2715 _mesa_glsl_error(& loc
, state
,
2716 "`%s' cannot be marked invariant, vertex shader "
2717 "outputs only\n", var
->name
);
2718 } else if ((state
->target
== fragment_shader
) &&
2719 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2720 /* FINISHME: Note that this doesn't work for invariant on
2721 * a function signature inval
2723 _mesa_glsl_error(& loc
, state
,
2724 "`%s' cannot be marked invariant, fragment shader "
2725 "inputs only\n", var
->name
);
2729 if (state
->current_function
!= NULL
) {
2730 const char *mode
= NULL
;
2731 const char *extra
= "";
2733 /* There is no need to check for 'inout' here because the parser will
2734 * only allow that in function parameter lists.
2736 if (this->type
->qualifier
.flags
.q
.attribute
) {
2738 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2740 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2742 } else if (this->type
->qualifier
.flags
.q
.in
) {
2744 extra
= " or in function parameter list";
2745 } else if (this->type
->qualifier
.flags
.q
.out
) {
2747 extra
= " or in function parameter list";
2751 _mesa_glsl_error(& loc
, state
,
2752 "%s variable `%s' must be declared at "
2754 mode
, var
->name
, extra
);
2756 } else if (var
->mode
== ir_var_in
) {
2757 var
->read_only
= true;
2759 if (state
->target
== vertex_shader
) {
2760 bool error_emitted
= false;
2762 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2764 * "Vertex shader inputs can only be float, floating-point
2765 * vectors, matrices, signed and unsigned integers and integer
2766 * vectors. Vertex shader inputs can also form arrays of these
2767 * types, but not structures."
2769 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2771 * "Vertex shader inputs can only be float, floating-point
2772 * vectors, matrices, signed and unsigned integers and integer
2773 * vectors. They cannot be arrays or structures."
2775 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2777 * "The attribute qualifier can be used only with float,
2778 * floating-point vectors, and matrices. Attribute variables
2779 * cannot be declared as arrays or structures."
2781 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
2783 * "Vertex shader inputs can only be float, floating-point
2784 * vectors, matrices, signed and unsigned integers and integer
2785 * vectors. Vertex shader inputs cannot be arrays or
2788 const glsl_type
*check_type
= var
->type
->is_array()
2789 ? var
->type
->fields
.array
: var
->type
;
2791 switch (check_type
->base_type
) {
2792 case GLSL_TYPE_FLOAT
:
2794 case GLSL_TYPE_UINT
:
2796 if (state
->is_version(120, 300))
2800 _mesa_glsl_error(& loc
, state
,
2801 "vertex shader input / attribute cannot have "
2803 var
->type
->is_array() ? "array of " : "",
2805 error_emitted
= true;
2808 if (!error_emitted
&& var
->type
->is_array() &&
2809 !state
->check_version(140, 0, &loc
,
2810 "vertex shader input / attribute "
2811 "cannot have array type")) {
2812 error_emitted
= true;
2817 /* Integer vertex outputs must be qualified with 'flat'.
2819 * From section 4.3.6 of the GLSL 1.30 spec:
2820 * "If a vertex output is a signed or unsigned integer or integer
2821 * vector, then it must be qualified with the interpolation qualifier
2824 * From section 4.3.4 of the GLSL 3.00 ES spec:
2825 * "Fragment shader inputs that are signed or unsigned integers or
2826 * integer vectors must be qualified with the interpolation qualifier
2829 * Since vertex outputs and fragment inputs must have matching
2830 * qualifiers, these two requirements are equivalent.
2832 if (state
->is_version(130, 300)
2833 && state
->target
== vertex_shader
2834 && state
->current_function
== NULL
2835 && var
->type
->is_integer()
2836 && var
->mode
== ir_var_out
2837 && var
->interpolation
!= INTERP_QUALIFIER_FLAT
) {
2839 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2840 "then it must be qualified with 'flat'");
2844 /* Interpolation qualifiers cannot be applied to 'centroid' and
2845 * 'centroid varying'.
2847 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2848 * "interpolation qualifiers may only precede the qualifiers in,
2849 * centroid in, out, or centroid out in a declaration. They do not apply
2850 * to the deprecated storage qualifiers varying or centroid varying."
2852 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2854 if (state
->is_version(130, 0)
2855 && this->type
->qualifier
.has_interpolation()
2856 && this->type
->qualifier
.flags
.q
.varying
) {
2858 const char *i
= this->type
->qualifier
.interpolation_string();
2861 if (this->type
->qualifier
.flags
.q
.centroid
)
2862 s
= "centroid varying";
2866 _mesa_glsl_error(&loc
, state
,
2867 "qualifier '%s' cannot be applied to the "
2868 "deprecated storage qualifier '%s'", i
, s
);
2872 /* Interpolation qualifiers can only apply to vertex shader outputs and
2873 * fragment shader inputs.
2875 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2876 * "Outputs from a vertex shader (out) and inputs to a fragment
2877 * shader (in) can be further qualified with one or more of these
2878 * interpolation qualifiers"
2880 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
2881 * "These interpolation qualifiers may only precede the qualifiers
2882 * in, centroid in, out, or centroid out in a declaration. They do
2883 * not apply to inputs into a vertex shader or outputs from a
2886 if (state
->is_version(130, 300)
2887 && this->type
->qualifier
.has_interpolation()) {
2889 const char *i
= this->type
->qualifier
.interpolation_string();
2892 switch (state
->target
) {
2894 if (this->type
->qualifier
.flags
.q
.in
) {
2895 _mesa_glsl_error(&loc
, state
,
2896 "qualifier '%s' cannot be applied to vertex "
2897 "shader inputs", i
);
2900 case fragment_shader
:
2901 if (this->type
->qualifier
.flags
.q
.out
) {
2902 _mesa_glsl_error(&loc
, state
,
2903 "qualifier '%s' cannot be applied to fragment "
2904 "shader outputs", i
);
2913 /* From section 4.3.4 of the GLSL 1.30 spec:
2914 * "It is an error to use centroid in in a vertex shader."
2916 * From section 4.3.4 of the GLSL ES 3.00 spec:
2917 * "It is an error to use centroid in or interpolation qualifiers in
2918 * a vertex shader input."
2920 if (state
->is_version(130, 300)
2921 && this->type
->qualifier
.flags
.q
.centroid
2922 && this->type
->qualifier
.flags
.q
.in
2923 && state
->target
== vertex_shader
) {
2925 _mesa_glsl_error(&loc
, state
,
2926 "'centroid in' cannot be used in a vertex shader");
2930 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2932 if (this->type
->specifier
->precision
!= ast_precision_none
) {
2933 state
->check_precision_qualifiers_allowed(&loc
);
2937 /* Precision qualifiers only apply to floating point and integer types.
2939 * From section 4.5.2 of the GLSL 1.30 spec:
2940 * "Any floating point or any integer declaration can have the type
2941 * preceded by one of these precision qualifiers [...] Literal
2942 * constants do not have precision qualifiers. Neither do Boolean
2945 * In GLSL ES, sampler types are also allowed.
2947 * From page 87 of the GLSL ES spec:
2948 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2950 if (this->type
->specifier
->precision
!= ast_precision_none
2951 && !var
->type
->is_float()
2952 && !var
->type
->is_integer()
2953 && !(var
->type
->is_sampler() && state
->es_shader
)
2954 && !(var
->type
->is_array()
2955 && (var
->type
->fields
.array
->is_float()
2956 || var
->type
->fields
.array
->is_integer()))) {
2958 _mesa_glsl_error(&loc
, state
,
2959 "precision qualifiers apply only to floating point"
2960 "%s types", state
->es_shader
? ", integer, and sampler"
2964 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2966 * "[Sampler types] can only be declared as function
2967 * parameters or uniform variables (see Section 4.3.5
2970 if (var_type
->contains_sampler() &&
2971 !this->type
->qualifier
.flags
.q
.uniform
) {
2972 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2975 /* Process the initializer and add its instructions to a temporary
2976 * list. This list will be added to the instruction stream (below) after
2977 * the declaration is added. This is done because in some cases (such as
2978 * redeclarations) the declaration may not actually be added to the
2979 * instruction stream.
2981 exec_list initializer_instructions
;
2982 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2984 if (decl
->initializer
!= NULL
) {
2985 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2987 &initializer_instructions
, state
);
2990 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2992 * "It is an error to write to a const variable outside of
2993 * its declaration, so they must be initialized when
2996 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2997 _mesa_glsl_error(& loc
, state
,
2998 "const declaration of `%s' must be initialized",
3002 /* If the declaration is not a redeclaration, there are a few additional
3003 * semantic checks that must be applied. In addition, variable that was
3004 * created for the declaration should be added to the IR stream.
3006 if (earlier
== NULL
) {
3007 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3009 * "Identifiers starting with "gl_" are reserved for use by
3010 * OpenGL, and may not be declared in a shader as either a
3011 * variable or a function."
3013 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
3014 _mesa_glsl_error(& loc
, state
,
3015 "identifier `%s' uses reserved `gl_' prefix",
3017 else if (strstr(decl
->identifier
, "__")) {
3018 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3021 * "In addition, all identifiers containing two
3022 * consecutive underscores (__) are reserved as
3023 * possible future keywords."
3025 _mesa_glsl_error(& loc
, state
,
3026 "identifier `%s' uses reserved `__' string",
3030 /* Add the variable to the symbol table. Note that the initializer's
3031 * IR was already processed earlier (though it hasn't been emitted
3032 * yet), without the variable in scope.
3034 * This differs from most C-like languages, but it follows the GLSL
3035 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3038 * "Within a declaration, the scope of a name starts immediately
3039 * after the initializer if present or immediately after the name
3040 * being declared if not."
3042 if (!state
->symbols
->add_variable(var
)) {
3043 YYLTYPE loc
= this->get_location();
3044 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3045 "current scope", decl
->identifier
);
3049 /* Push the variable declaration to the top. It means that all the
3050 * variable declarations will appear in a funny last-to-first order,
3051 * but otherwise we run into trouble if a function is prototyped, a
3052 * global var is decled, then the function is defined with usage of
3053 * the global var. See glslparsertest's CorrectModule.frag.
3055 instructions
->push_head(var
);
3058 instructions
->append_list(&initializer_instructions
);
3062 /* Generally, variable declarations do not have r-values. However,
3063 * one is used for the declaration in
3065 * while (bool b = some_condition()) {
3069 * so we return the rvalue from the last seen declaration here.
3076 ast_parameter_declarator::hir(exec_list
*instructions
,
3077 struct _mesa_glsl_parse_state
*state
)
3080 const struct glsl_type
*type
;
3081 const char *name
= NULL
;
3082 YYLTYPE loc
= this->get_location();
3084 type
= this->type
->specifier
->glsl_type(& name
, state
);
3088 _mesa_glsl_error(& loc
, state
,
3089 "invalid type `%s' in declaration of `%s'",
3090 name
, this->identifier
);
3092 _mesa_glsl_error(& loc
, state
,
3093 "invalid type in declaration of `%s'",
3097 type
= glsl_type::error_type
;
3100 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3102 * "Functions that accept no input arguments need not use void in the
3103 * argument list because prototypes (or definitions) are required and
3104 * therefore there is no ambiguity when an empty argument list "( )" is
3105 * declared. The idiom "(void)" as a parameter list is provided for
3108 * Placing this check here prevents a void parameter being set up
3109 * for a function, which avoids tripping up checks for main taking
3110 * parameters and lookups of an unnamed symbol.
3112 if (type
->is_void()) {
3113 if (this->identifier
!= NULL
)
3114 _mesa_glsl_error(& loc
, state
,
3115 "named parameter cannot have type `void'");
3121 if (formal_parameter
&& (this->identifier
== NULL
)) {
3122 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3126 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3127 * call already handled the "vec4[..] foo" case.
3129 if (this->is_array
) {
3130 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3133 if (!type
->is_error() && type
->array_size() == 0) {
3134 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3135 "a declared size.");
3136 type
= glsl_type::error_type
;
3140 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
3142 /* Apply any specified qualifiers to the parameter declaration. Note that
3143 * for function parameters the default mode is 'in'.
3145 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3148 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3150 * "Samplers cannot be treated as l-values; hence cannot be used
3151 * as out or inout function parameters, nor can they be assigned
3154 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3155 && type
->contains_sampler()) {
3156 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3157 type
= glsl_type::error_type
;
3160 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3162 * "When calling a function, expressions that do not evaluate to
3163 * l-values cannot be passed to parameters declared as out or inout."
3165 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3167 * "Other binary or unary expressions, non-dereferenced arrays,
3168 * function names, swizzles with repeated fields, and constants
3169 * cannot be l-values."
3171 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3172 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3174 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3176 && !state
->check_version(120, 100, &loc
,
3177 "Arrays cannot be out or inout parameters")) {
3178 type
= glsl_type::error_type
;
3181 instructions
->push_tail(var
);
3183 /* Parameter declarations do not have r-values.
3190 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3192 exec_list
*ir_parameters
,
3193 _mesa_glsl_parse_state
*state
)
3195 ast_parameter_declarator
*void_param
= NULL
;
3198 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3199 param
->formal_parameter
= formal
;
3200 param
->hir(ir_parameters
, state
);
3208 if ((void_param
!= NULL
) && (count
> 1)) {
3209 YYLTYPE loc
= void_param
->get_location();
3211 _mesa_glsl_error(& loc
, state
,
3212 "`void' parameter must be only parameter");
3218 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3220 /* IR invariants disallow function declarations or definitions
3221 * nested within other function definitions. But there is no
3222 * requirement about the relative order of function declarations
3223 * and definitions with respect to one another. So simply insert
3224 * the new ir_function block at the end of the toplevel instruction
3227 state
->toplevel_ir
->push_tail(f
);
3232 ast_function::hir(exec_list
*instructions
,
3233 struct _mesa_glsl_parse_state
*state
)
3236 ir_function
*f
= NULL
;
3237 ir_function_signature
*sig
= NULL
;
3238 exec_list hir_parameters
;
3240 const char *const name
= identifier
;
3242 /* New functions are always added to the top-level IR instruction stream,
3243 * so this instruction list pointer is ignored. See also emit_function
3246 (void) instructions
;
3248 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3250 * "Function declarations (prototypes) cannot occur inside of functions;
3251 * they must be at global scope, or for the built-in functions, outside
3252 * the global scope."
3254 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3256 * "User defined functions may only be defined within the global scope."
3258 * Note that this language does not appear in GLSL 1.10.
3260 if ((state
->current_function
!= NULL
) &&
3261 state
->is_version(120, 100)) {
3262 YYLTYPE loc
= this->get_location();
3263 _mesa_glsl_error(&loc
, state
,
3264 "declaration of function `%s' not allowed within "
3265 "function body", name
);
3268 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3270 * "Identifiers starting with "gl_" are reserved for use by
3271 * OpenGL, and may not be declared in a shader as either a
3272 * variable or a function."
3274 if (strncmp(name
, "gl_", 3) == 0) {
3275 YYLTYPE loc
= this->get_location();
3276 _mesa_glsl_error(&loc
, state
,
3277 "identifier `%s' uses reserved `gl_' prefix", name
);
3280 /* Convert the list of function parameters to HIR now so that they can be
3281 * used below to compare this function's signature with previously seen
3282 * signatures for functions with the same name.
3284 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3286 & hir_parameters
, state
);
3288 const char *return_type_name
;
3289 const glsl_type
*return_type
=
3290 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3293 YYLTYPE loc
= this->get_location();
3294 _mesa_glsl_error(&loc
, state
,
3295 "function `%s' has undeclared return type `%s'",
3296 name
, return_type_name
);
3297 return_type
= glsl_type::error_type
;
3300 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3301 * "No qualifier is allowed on the return type of a function."
3303 if (this->return_type
->has_qualifiers()) {
3304 YYLTYPE loc
= this->get_location();
3305 _mesa_glsl_error(& loc
, state
,
3306 "function `%s' return type has qualifiers", name
);
3309 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3311 * "[Sampler types] can only be declared as function parameters
3312 * or uniform variables (see Section 4.3.5 "Uniform")".
3314 if (return_type
->contains_sampler()) {
3315 YYLTYPE loc
= this->get_location();
3316 _mesa_glsl_error(&loc
, state
,
3317 "function `%s' return type can't contain a sampler",
3321 /* Verify that this function's signature either doesn't match a previously
3322 * seen signature for a function with the same name, or, if a match is found,
3323 * that the previously seen signature does not have an associated definition.
3325 f
= state
->symbols
->get_function(name
);
3326 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3327 sig
= f
->exact_matching_signature(&hir_parameters
);
3329 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3330 if (badvar
!= NULL
) {
3331 YYLTYPE loc
= this->get_location();
3333 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3334 "qualifiers don't match prototype", name
, badvar
);
3337 if (sig
->return_type
!= return_type
) {
3338 YYLTYPE loc
= this->get_location();
3340 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3341 "match prototype", name
);
3344 if (is_definition
&& sig
->is_defined
) {
3345 YYLTYPE loc
= this->get_location();
3347 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3351 f
= new(ctx
) ir_function(name
);
3352 if (!state
->symbols
->add_function(f
)) {
3353 /* This function name shadows a non-function use of the same name. */
3354 YYLTYPE loc
= this->get_location();
3356 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3357 "non-function", name
);
3361 emit_function(state
, f
);
3364 /* Verify the return type of main() */
3365 if (strcmp(name
, "main") == 0) {
3366 if (! return_type
->is_void()) {
3367 YYLTYPE loc
= this->get_location();
3369 _mesa_glsl_error(& loc
, state
, "main() must return void");
3372 if (!hir_parameters
.is_empty()) {
3373 YYLTYPE loc
= this->get_location();
3375 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3379 /* Finish storing the information about this new function in its signature.
3382 sig
= new(ctx
) ir_function_signature(return_type
);
3383 f
->add_signature(sig
);
3386 sig
->replace_parameters(&hir_parameters
);
3389 /* Function declarations (prototypes) do not have r-values.
3396 ast_function_definition::hir(exec_list
*instructions
,
3397 struct _mesa_glsl_parse_state
*state
)
3399 prototype
->is_definition
= true;
3400 prototype
->hir(instructions
, state
);
3402 ir_function_signature
*signature
= prototype
->signature
;
3403 if (signature
== NULL
)
3406 assert(state
->current_function
== NULL
);
3407 state
->current_function
= signature
;
3408 state
->found_return
= false;
3410 /* Duplicate parameters declared in the prototype as concrete variables.
3411 * Add these to the symbol table.
3413 state
->symbols
->push_scope();
3414 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3415 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3417 assert(var
!= NULL
);
3419 /* The only way a parameter would "exist" is if two parameters have
3422 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3423 YYLTYPE loc
= this->get_location();
3425 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3427 state
->symbols
->add_variable(var
);
3431 /* Convert the body of the function to HIR. */
3432 this->body
->hir(&signature
->body
, state
);
3433 signature
->is_defined
= true;
3435 state
->symbols
->pop_scope();
3437 assert(state
->current_function
== signature
);
3438 state
->current_function
= NULL
;
3440 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3441 YYLTYPE loc
= this->get_location();
3442 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3443 "%s, but no return statement",
3444 signature
->function_name(),
3445 signature
->return_type
->name
);
3448 /* Function definitions do not have r-values.
3455 ast_jump_statement::hir(exec_list
*instructions
,
3456 struct _mesa_glsl_parse_state
*state
)
3463 assert(state
->current_function
);
3465 if (opt_return_value
) {
3466 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3468 /* The value of the return type can be NULL if the shader says
3469 * 'return foo();' and foo() is a function that returns void.
3471 * NOTE: The GLSL spec doesn't say that this is an error. The type
3472 * of the return value is void. If the return type of the function is
3473 * also void, then this should compile without error. Seriously.
3475 const glsl_type
*const ret_type
=
3476 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3478 /* Implicit conversions are not allowed for return values. */
3479 if (state
->current_function
->return_type
!= ret_type
) {
3480 YYLTYPE loc
= this->get_location();
3482 _mesa_glsl_error(& loc
, state
,
3483 "`return' with wrong type %s, in function `%s' "
3486 state
->current_function
->function_name(),
3487 state
->current_function
->return_type
->name
);
3490 inst
= new(ctx
) ir_return(ret
);
3492 if (state
->current_function
->return_type
->base_type
!=
3494 YYLTYPE loc
= this->get_location();
3496 _mesa_glsl_error(& loc
, state
,
3497 "`return' with no value, in function %s returning "
3499 state
->current_function
->function_name());
3501 inst
= new(ctx
) ir_return
;
3504 state
->found_return
= true;
3505 instructions
->push_tail(inst
);
3510 if (state
->target
!= fragment_shader
) {
3511 YYLTYPE loc
= this->get_location();
3513 _mesa_glsl_error(& loc
, state
,
3514 "`discard' may only appear in a fragment shader");
3516 instructions
->push_tail(new(ctx
) ir_discard
);
3521 if (mode
== ast_continue
&&
3522 state
->loop_nesting_ast
== NULL
) {
3523 YYLTYPE loc
= this->get_location();
3525 _mesa_glsl_error(& loc
, state
,
3526 "continue may only appear in a loop");
3527 } else if (mode
== ast_break
&&
3528 state
->loop_nesting_ast
== NULL
&&
3529 state
->switch_state
.switch_nesting_ast
== NULL
) {
3530 YYLTYPE loc
= this->get_location();
3532 _mesa_glsl_error(& loc
, state
,
3533 "break may only appear in a loop or a switch");
3535 /* For a loop, inline the for loop expression again,
3536 * since we don't know where near the end of
3537 * the loop body the normal copy of it
3538 * is going to be placed.
3540 if (state
->loop_nesting_ast
!= NULL
&&
3541 mode
== ast_continue
&&
3542 state
->loop_nesting_ast
->rest_expression
) {
3543 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3547 if (state
->switch_state
.is_switch_innermost
&&
3548 mode
== ast_break
) {
3549 /* Force break out of switch by setting is_break switch state.
3551 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3552 ir_dereference_variable
*const deref_is_break_var
=
3553 new(ctx
) ir_dereference_variable(is_break_var
);
3554 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3555 ir_assignment
*const set_break_var
=
3556 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3558 instructions
->push_tail(set_break_var
);
3561 ir_loop_jump
*const jump
=
3562 new(ctx
) ir_loop_jump((mode
== ast_break
)
3563 ? ir_loop_jump::jump_break
3564 : ir_loop_jump::jump_continue
);
3565 instructions
->push_tail(jump
);
3572 /* Jump instructions do not have r-values.
3579 ast_selection_statement::hir(exec_list
*instructions
,
3580 struct _mesa_glsl_parse_state
*state
)
3584 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3586 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3588 * "Any expression whose type evaluates to a Boolean can be used as the
3589 * conditional expression bool-expression. Vector types are not accepted
3590 * as the expression to if."
3592 * The checks are separated so that higher quality diagnostics can be
3593 * generated for cases where both rules are violated.
3595 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3596 YYLTYPE loc
= this->condition
->get_location();
3598 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3602 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3604 if (then_statement
!= NULL
) {
3605 state
->symbols
->push_scope();
3606 then_statement
->hir(& stmt
->then_instructions
, state
);
3607 state
->symbols
->pop_scope();
3610 if (else_statement
!= NULL
) {
3611 state
->symbols
->push_scope();
3612 else_statement
->hir(& stmt
->else_instructions
, state
);
3613 state
->symbols
->pop_scope();
3616 instructions
->push_tail(stmt
);
3618 /* if-statements do not have r-values.
3625 ast_switch_statement::hir(exec_list
*instructions
,
3626 struct _mesa_glsl_parse_state
*state
)
3630 ir_rvalue
*const test_expression
=
3631 this->test_expression
->hir(instructions
, state
);
3633 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3635 * "The type of init-expression in a switch statement must be a
3638 if (!test_expression
->type
->is_scalar() ||
3639 !test_expression
->type
->is_integer()) {
3640 YYLTYPE loc
= this->test_expression
->get_location();
3642 _mesa_glsl_error(& loc
,
3644 "switch-statement expression must be scalar "
3648 /* Track the switch-statement nesting in a stack-like manner.
3650 struct glsl_switch_state saved
= state
->switch_state
;
3652 state
->switch_state
.is_switch_innermost
= true;
3653 state
->switch_state
.switch_nesting_ast
= this;
3654 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3655 hash_table_pointer_compare
);
3656 state
->switch_state
.previous_default
= NULL
;
3658 /* Initalize is_fallthru state to false.
3660 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3661 state
->switch_state
.is_fallthru_var
=
3662 new(ctx
) ir_variable(glsl_type::bool_type
,
3663 "switch_is_fallthru_tmp",
3665 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3667 ir_dereference_variable
*deref_is_fallthru_var
=
3668 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3669 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3672 /* Initalize is_break state to false.
3674 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3675 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3676 "switch_is_break_tmp",
3678 instructions
->push_tail(state
->switch_state
.is_break_var
);
3680 ir_dereference_variable
*deref_is_break_var
=
3681 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3682 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3685 /* Cache test expression.
3687 test_to_hir(instructions
, state
);
3689 /* Emit code for body of switch stmt.
3691 body
->hir(instructions
, state
);
3693 hash_table_dtor(state
->switch_state
.labels_ht
);
3695 state
->switch_state
= saved
;
3697 /* Switch statements do not have r-values. */
3703 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3704 struct _mesa_glsl_parse_state
*state
)
3708 /* Cache value of test expression. */
3709 ir_rvalue
*const test_val
=
3710 test_expression
->hir(instructions
,
3713 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3716 ir_dereference_variable
*deref_test_var
=
3717 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3719 instructions
->push_tail(state
->switch_state
.test_var
);
3720 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
3725 ast_switch_body::hir(exec_list
*instructions
,
3726 struct _mesa_glsl_parse_state
*state
)
3729 stmts
->hir(instructions
, state
);
3731 /* Switch bodies do not have r-values. */
3736 ast_case_statement_list::hir(exec_list
*instructions
,
3737 struct _mesa_glsl_parse_state
*state
)
3739 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3740 case_stmt
->hir(instructions
, state
);
3742 /* Case statements do not have r-values. */
3747 ast_case_statement::hir(exec_list
*instructions
,
3748 struct _mesa_glsl_parse_state
*state
)
3750 labels
->hir(instructions
, state
);
3752 /* Conditionally set fallthru state based on break state. */
3753 ir_constant
*const false_val
= new(state
) ir_constant(false);
3754 ir_dereference_variable
*const deref_is_fallthru_var
=
3755 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3756 ir_dereference_variable
*const deref_is_break_var
=
3757 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3758 ir_assignment
*const reset_fallthru_on_break
=
3759 new(state
) ir_assignment(deref_is_fallthru_var
,
3761 deref_is_break_var
);
3762 instructions
->push_tail(reset_fallthru_on_break
);
3764 /* Guard case statements depending on fallthru state. */
3765 ir_dereference_variable
*const deref_fallthru_guard
=
3766 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3767 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3769 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3770 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3772 instructions
->push_tail(test_fallthru
);
3774 /* Case statements do not have r-values. */
3780 ast_case_label_list::hir(exec_list
*instructions
,
3781 struct _mesa_glsl_parse_state
*state
)
3783 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3784 label
->hir(instructions
, state
);
3786 /* Case labels do not have r-values. */
3791 ast_case_label::hir(exec_list
*instructions
,
3792 struct _mesa_glsl_parse_state
*state
)
3796 ir_dereference_variable
*deref_fallthru_var
=
3797 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3799 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3801 /* If not default case, ... */
3802 if (this->test_value
!= NULL
) {
3803 /* Conditionally set fallthru state based on
3804 * comparison of cached test expression value to case label.
3806 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3807 ir_constant
*label_const
= label_rval
->constant_expression_value();
3810 YYLTYPE loc
= this->test_value
->get_location();
3812 _mesa_glsl_error(& loc
, state
,
3813 "switch statement case label must be a "
3814 "constant expression");
3816 /* Stuff a dummy value in to allow processing to continue. */
3817 label_const
= new(ctx
) ir_constant(0);
3819 ast_expression
*previous_label
= (ast_expression
*)
3820 hash_table_find(state
->switch_state
.labels_ht
,
3821 (void *)(uintptr_t)label_const
->value
.u
[0]);
3823 if (previous_label
) {
3824 YYLTYPE loc
= this->test_value
->get_location();
3825 _mesa_glsl_error(& loc
, state
,
3826 "duplicate case value");
3828 loc
= previous_label
->get_location();
3829 _mesa_glsl_error(& loc
, state
,
3830 "this is the previous case label");
3832 hash_table_insert(state
->switch_state
.labels_ht
,
3834 (void *)(uintptr_t)label_const
->value
.u
[0]);
3838 ir_dereference_variable
*deref_test_var
=
3839 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3841 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3845 ir_assignment
*set_fallthru_on_test
=
3846 new(ctx
) ir_assignment(deref_fallthru_var
,
3850 instructions
->push_tail(set_fallthru_on_test
);
3851 } else { /* default case */
3852 if (state
->switch_state
.previous_default
) {
3853 YYLTYPE loc
= this->get_location();
3854 _mesa_glsl_error(& loc
, state
,
3855 "multiple default labels in one switch");
3857 loc
= state
->switch_state
.previous_default
->get_location();
3858 _mesa_glsl_error(& loc
, state
,
3859 "this is the first default label");
3861 state
->switch_state
.previous_default
= this;
3863 /* Set falltrhu state. */
3864 ir_assignment
*set_fallthru
=
3865 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
3867 instructions
->push_tail(set_fallthru
);
3870 /* Case statements do not have r-values. */
3875 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3876 struct _mesa_glsl_parse_state
*state
)
3880 if (condition
!= NULL
) {
3881 ir_rvalue
*const cond
=
3882 condition
->hir(& stmt
->body_instructions
, state
);
3885 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3886 YYLTYPE loc
= condition
->get_location();
3888 _mesa_glsl_error(& loc
, state
,
3889 "loop condition must be scalar boolean");
3891 /* As the first code in the loop body, generate a block that looks
3892 * like 'if (!condition) break;' as the loop termination condition.
3894 ir_rvalue
*const not_cond
=
3895 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
3897 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3899 ir_jump
*const break_stmt
=
3900 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3902 if_stmt
->then_instructions
.push_tail(break_stmt
);
3903 stmt
->body_instructions
.push_tail(if_stmt
);
3910 ast_iteration_statement::hir(exec_list
*instructions
,
3911 struct _mesa_glsl_parse_state
*state
)
3915 /* For-loops and while-loops start a new scope, but do-while loops do not.
3917 if (mode
!= ast_do_while
)
3918 state
->symbols
->push_scope();
3920 if (init_statement
!= NULL
)
3921 init_statement
->hir(instructions
, state
);
3923 ir_loop
*const stmt
= new(ctx
) ir_loop();
3924 instructions
->push_tail(stmt
);
3926 /* Track the current loop nesting. */
3927 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3929 state
->loop_nesting_ast
= this;
3931 /* Likewise, indicate that following code is closest to a loop,
3932 * NOT closest to a switch.
3934 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3935 state
->switch_state
.is_switch_innermost
= false;
3937 if (mode
!= ast_do_while
)
3938 condition_to_hir(stmt
, state
);
3941 body
->hir(& stmt
->body_instructions
, state
);
3943 if (rest_expression
!= NULL
)
3944 rest_expression
->hir(& stmt
->body_instructions
, state
);
3946 if (mode
== ast_do_while
)
3947 condition_to_hir(stmt
, state
);
3949 if (mode
!= ast_do_while
)
3950 state
->symbols
->pop_scope();
3952 /* Restore previous nesting before returning. */
3953 state
->loop_nesting_ast
= nesting_ast
;
3954 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3956 /* Loops do not have r-values.
3963 ast_type_specifier::hir(exec_list
*instructions
,
3964 struct _mesa_glsl_parse_state
*state
)
3966 if (!this->is_precision_statement
&& this->structure
== NULL
)
3969 YYLTYPE loc
= this->get_location();
3971 if (this->precision
!= ast_precision_none
3972 && !state
->check_precision_qualifiers_allowed(&loc
)) {
3975 if (this->precision
!= ast_precision_none
3976 && this->structure
!= NULL
) {
3977 _mesa_glsl_error(&loc
, state
,
3978 "precision qualifiers do not apply to structures");
3982 /* If this is a precision statement, check that the type to which it is
3983 * applied is either float or int.
3985 * From section 4.5.3 of the GLSL 1.30 spec:
3986 * "The precision statement
3987 * precision precision-qualifier type;
3988 * can be used to establish a default precision qualifier. The type
3989 * field can be either int or float [...]. Any other types or
3990 * qualifiers will result in an error.
3992 if (this->is_precision_statement
) {
3993 assert(this->precision
!= ast_precision_none
);
3994 assert(this->structure
== NULL
); /* The check for structures was
3995 * performed above. */
3996 if (this->is_array
) {
3997 _mesa_glsl_error(&loc
, state
,
3998 "default precision statements do not apply to "
4002 if (strcmp(this->type_name
, "float") != 0 &&
4003 strcmp(this->type_name
, "int") != 0) {
4004 _mesa_glsl_error(&loc
, state
,
4005 "default precision statements apply only to types "
4010 /* FINISHME: Translate precision statements into IR. */
4014 if (this->structure
!= NULL
)
4015 return this->structure
->hir(instructions
, state
);
4022 ast_struct_specifier::hir(exec_list
*instructions
,
4023 struct _mesa_glsl_parse_state
*state
)
4025 unsigned decl_count
= 0;
4027 /* Make an initial pass over the list of structure fields to determine how
4028 * many there are. Each element in this list is an ast_declarator_list.
4029 * This means that we actually need to count the number of elements in the
4030 * 'declarations' list in each of the elements.
4032 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
4033 &this->declarations
) {
4034 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4039 /* Allocate storage for the structure fields and process the field
4040 * declarations. As the declarations are processed, try to also convert
4041 * the types to HIR. This ensures that structure definitions embedded in
4042 * other structure definitions are processed.
4044 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4048 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
4049 &this->declarations
) {
4050 const char *type_name
;
4052 decl_list
->type
->specifier
->hir(instructions
, state
);
4054 /* Section 10.9 of the GLSL ES 1.00 specification states that
4055 * embedded structure definitions have been removed from the language.
4057 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4058 YYLTYPE loc
= this->get_location();
4059 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
4060 "not allowed in GLSL ES 1.00.");
4063 const glsl_type
*decl_type
=
4064 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
4066 foreach_list_typed (ast_declaration
, decl
, link
,
4067 &decl_list
->declarations
) {
4068 const struct glsl_type
*field_type
= decl_type
;
4069 if (decl
->is_array
) {
4070 YYLTYPE loc
= decl
->get_location();
4071 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4074 fields
[i
].type
= (field_type
!= NULL
)
4075 ? field_type
: glsl_type::error_type
;
4076 fields
[i
].name
= decl
->identifier
;
4081 assert(i
== decl_count
);
4083 const glsl_type
*t
=
4084 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4086 YYLTYPE loc
= this->get_location();
4087 if (!state
->symbols
->add_type(name
, t
)) {
4088 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4090 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4092 state
->num_user_structures
+ 1);
4094 s
[state
->num_user_structures
] = t
;
4095 state
->user_structures
= s
;
4096 state
->num_user_structures
++;
4100 /* Structure type definitions do not have r-values.
4105 static struct gl_uniform_block
*
4106 get_next_uniform_block(struct _mesa_glsl_parse_state
*state
)
4108 if (state
->num_uniform_blocks
>= state
->uniform_block_array_size
) {
4109 state
->uniform_block_array_size
*= 2;
4110 if (state
->uniform_block_array_size
<= 4)
4111 state
->uniform_block_array_size
= 4;
4113 state
->uniform_blocks
= reralloc(state
,
4114 state
->uniform_blocks
,
4115 struct gl_uniform_block
,
4116 state
->uniform_block_array_size
);
4119 memset(&state
->uniform_blocks
[state
->num_uniform_blocks
],
4120 0, sizeof(*state
->uniform_blocks
));
4121 return &state
->uniform_blocks
[state
->num_uniform_blocks
++];
4125 ast_uniform_block::hir(exec_list
*instructions
,
4126 struct _mesa_glsl_parse_state
*state
)
4128 /* The ast_uniform_block has a list of ast_declarator_lists. We
4129 * need to turn those into ir_variables with an association
4130 * with this uniform block.
4132 struct gl_uniform_block
*ubo
= get_next_uniform_block(state
);
4133 ubo
->Name
= ralloc_strdup(state
->uniform_blocks
, this->block_name
);
4135 if (!state
->symbols
->add_uniform_block(ubo
)) {
4136 YYLTYPE loc
= this->get_location();
4137 _mesa_glsl_error(&loc
, state
, "Uniform block name `%s' already taken in "
4138 "the current scope.\n", ubo
->Name
);
4141 unsigned int num_variables
= 0;
4142 foreach_list_typed(ast_declarator_list
, decl_list
, link
, &declarations
) {
4143 foreach_list_const(node
, &decl_list
->declarations
) {
4148 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4150 ubo
->Uniforms
= rzalloc_array(state
->uniform_blocks
,
4151 struct gl_uniform_buffer_variable
,
4154 foreach_list_typed(ast_declarator_list
, decl_list
, link
, &declarations
) {
4155 exec_list declared_variables
;
4157 decl_list
->hir(&declared_variables
, state
);
4159 foreach_list_const(node
, &declared_variables
) {
4160 ir_variable
*var
= (ir_variable
*)node
;
4162 struct gl_uniform_buffer_variable
*ubo_var
=
4163 &ubo
->Uniforms
[ubo
->NumUniforms
++];
4165 var
->uniform_block
= ubo
- state
->uniform_blocks
;
4167 ubo_var
->Name
= ralloc_strdup(state
->uniform_blocks
, var
->name
);
4168 ubo_var
->Type
= var
->type
;
4169 ubo_var
->Offset
= 0; /* Assigned at link time. */
4171 if (var
->type
->is_matrix() ||
4172 (var
->type
->is_array() && var
->type
->fields
.array
->is_matrix())) {
4173 ubo_var
->RowMajor
= block_row_major
;
4174 if (decl_list
->type
->qualifier
.flags
.q
.row_major
)
4175 ubo_var
->RowMajor
= true;
4176 else if (decl_list
->type
->qualifier
.flags
.q
.column_major
)
4177 ubo_var
->RowMajor
= false;
4180 /* From the GL_ARB_uniform_buffer_object spec:
4182 * "Sampler types are not allowed inside of uniform
4183 * blocks. All other types, arrays, and structures
4184 * allowed for uniforms are allowed within a uniform
4187 if (var
->type
->contains_sampler()) {
4188 YYLTYPE loc
= decl_list
->get_location();
4189 _mesa_glsl_error(&loc
, state
,
4190 "Uniform in non-default uniform block contains sampler\n");
4194 instructions
->append_list(&declared_variables
);
4201 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
4202 exec_list
*instructions
)
4204 bool gl_FragColor_assigned
= false;
4205 bool gl_FragData_assigned
= false;
4206 bool user_defined_fs_output_assigned
= false;
4207 ir_variable
*user_defined_fs_output
= NULL
;
4209 /* It would be nice to have proper location information. */
4211 memset(&loc
, 0, sizeof(loc
));
4213 foreach_list(node
, instructions
) {
4214 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4216 if (!var
|| !var
->assigned
)
4219 if (strcmp(var
->name
, "gl_FragColor") == 0)
4220 gl_FragColor_assigned
= true;
4221 else if (strcmp(var
->name
, "gl_FragData") == 0)
4222 gl_FragData_assigned
= true;
4223 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4224 if (state
->target
== fragment_shader
&&
4225 (var
->mode
== ir_var_out
|| var
->mode
== ir_var_inout
)) {
4226 user_defined_fs_output_assigned
= true;
4227 user_defined_fs_output
= var
;
4232 /* From the GLSL 1.30 spec:
4234 * "If a shader statically assigns a value to gl_FragColor, it
4235 * may not assign a value to any element of gl_FragData. If a
4236 * shader statically writes a value to any element of
4237 * gl_FragData, it may not assign a value to
4238 * gl_FragColor. That is, a shader may assign values to either
4239 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4240 * linked together must also consistently write just one of
4241 * these variables. Similarly, if user declared output
4242 * variables are in use (statically assigned to), then the
4243 * built-in variables gl_FragColor and gl_FragData may not be
4244 * assigned to. These incorrect usages all generate compile
4247 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
4248 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4249 "`gl_FragColor' and `gl_FragData'\n");
4250 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
4251 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4252 "`gl_FragColor' and `%s'\n",
4253 user_defined_fs_output
->name
);
4254 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
4255 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4256 "`gl_FragData' and `%s'\n",
4257 user_defined_fs_output
->name
);