2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
57 #include "program/hash_table.h"
61 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
62 exec_list
*instructions
);
65 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
67 _mesa_glsl_initialize_variables(instructions
, state
);
69 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
71 state
->current_function
= NULL
;
73 state
->toplevel_ir
= instructions
;
75 /* Section 4.2 of the GLSL 1.20 specification states:
76 * "The built-in functions are scoped in a scope outside the global scope
77 * users declare global variables in. That is, a shader's global scope,
78 * available for user-defined functions and global variables, is nested
79 * inside the scope containing the built-in functions."
81 * Since built-in functions like ftransform() access built-in variables,
82 * it follows that those must be in the outer scope as well.
84 * We push scope here to create this nesting effect...but don't pop.
85 * This way, a shader's globals are still in the symbol table for use
88 state
->symbols
->push_scope();
90 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
91 ast
->hir(instructions
, state
);
93 detect_recursion_unlinked(state
, instructions
);
94 detect_conflicting_assignments(state
, instructions
);
96 state
->toplevel_ir
= NULL
;
101 * If a conversion is available, convert one operand to a different type
103 * The \c from \c ir_rvalue is converted "in place".
105 * \param to Type that the operand it to be converted to
106 * \param from Operand that is being converted
107 * \param state GLSL compiler state
110 * If a conversion is possible (or unnecessary), \c true is returned.
111 * Otherwise \c false is returned.
114 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
115 struct _mesa_glsl_parse_state
*state
)
118 if (to
->base_type
== from
->type
->base_type
)
121 /* This conversion was added in GLSL 1.20. If the compilation mode is
122 * GLSL 1.10, the conversion is skipped.
124 if (!state
->is_version(120, 0))
127 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
129 * "There are no implicit array or structure conversions. For
130 * example, an array of int cannot be implicitly converted to an
131 * array of float. There are no implicit conversions between
132 * signed and unsigned integers."
134 /* FINISHME: The above comment is partially a lie. There is int/uint
135 * FINISHME: conversion for immediate constants.
137 if (!to
->is_float() || !from
->type
->is_numeric())
140 /* Convert to a floating point type with the same number of components
141 * as the original type - i.e. int to float, not int to vec4.
143 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
144 from
->type
->matrix_columns
);
146 switch (from
->type
->base_type
) {
148 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
151 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
154 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
164 static const struct glsl_type
*
165 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
167 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
169 const glsl_type
*type_a
= value_a
->type
;
170 const glsl_type
*type_b
= value_b
->type
;
172 /* From GLSL 1.50 spec, page 56:
174 * "The arithmetic binary operators add (+), subtract (-),
175 * multiply (*), and divide (/) operate on integer and
176 * floating-point scalars, vectors, and matrices."
178 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
179 _mesa_glsl_error(loc
, state
,
180 "Operands to arithmetic operators must be numeric");
181 return glsl_type::error_type
;
185 /* "If one operand is floating-point based and the other is
186 * not, then the conversions from Section 4.1.10 "Implicit
187 * Conversions" are applied to the non-floating-point-based operand."
189 if (!apply_implicit_conversion(type_a
, value_b
, state
)
190 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
191 _mesa_glsl_error(loc
, state
,
192 "Could not implicitly convert operands to "
193 "arithmetic operator");
194 return glsl_type::error_type
;
196 type_a
= value_a
->type
;
197 type_b
= value_b
->type
;
199 /* "If the operands are integer types, they must both be signed or
202 * From this rule and the preceeding conversion it can be inferred that
203 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
204 * The is_numeric check above already filtered out the case where either
205 * type is not one of these, so now the base types need only be tested for
208 if (type_a
->base_type
!= type_b
->base_type
) {
209 _mesa_glsl_error(loc
, state
,
210 "base type mismatch for arithmetic operator");
211 return glsl_type::error_type
;
214 /* "All arithmetic binary operators result in the same fundamental type
215 * (signed integer, unsigned integer, or floating-point) as the
216 * operands they operate on, after operand type conversion. After
217 * conversion, the following cases are valid
219 * * The two operands are scalars. In this case the operation is
220 * applied, resulting in a scalar."
222 if (type_a
->is_scalar() && type_b
->is_scalar())
225 /* "* One operand is a scalar, and the other is a vector or matrix.
226 * In this case, the scalar operation is applied independently to each
227 * component of the vector or matrix, resulting in the same size
230 if (type_a
->is_scalar()) {
231 if (!type_b
->is_scalar())
233 } else if (type_b
->is_scalar()) {
237 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
238 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
241 assert(!type_a
->is_scalar());
242 assert(!type_b
->is_scalar());
244 /* "* The two operands are vectors of the same size. In this case, the
245 * operation is done component-wise resulting in the same size
248 if (type_a
->is_vector() && type_b
->is_vector()) {
249 if (type_a
== type_b
) {
252 _mesa_glsl_error(loc
, state
,
253 "vector size mismatch for arithmetic operator");
254 return glsl_type::error_type
;
258 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
259 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
260 * <vector, vector> have been handled. At least one of the operands must
261 * be matrix. Further, since there are no integer matrix types, the base
262 * type of both operands must be float.
264 assert(type_a
->is_matrix() || type_b
->is_matrix());
265 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
266 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
268 /* "* The operator is add (+), subtract (-), or divide (/), and the
269 * operands are matrices with the same number of rows and the same
270 * number of columns. In this case, the operation is done component-
271 * wise resulting in the same size matrix."
272 * * The operator is multiply (*), where both operands are matrices or
273 * one operand is a vector and the other a matrix. A right vector
274 * operand is treated as a column vector and a left vector operand as a
275 * row vector. In all these cases, it is required that the number of
276 * columns of the left operand is equal to the number of rows of the
277 * right operand. Then, the multiply (*) operation does a linear
278 * algebraic multiply, yielding an object that has the same number of
279 * rows as the left operand and the same number of columns as the right
280 * operand. Section 5.10 "Vector and Matrix Operations" explains in
281 * more detail how vectors and matrices are operated on."
284 if (type_a
== type_b
)
287 if (type_a
->is_matrix() && type_b
->is_matrix()) {
288 /* Matrix multiply. The columns of A must match the rows of B. Given
289 * the other previously tested constraints, this means the vector type
290 * of a row from A must be the same as the vector type of a column from
293 if (type_a
->row_type() == type_b
->column_type()) {
294 /* The resulting matrix has the number of columns of matrix B and
295 * the number of rows of matrix A. We get the row count of A by
296 * looking at the size of a vector that makes up a column. The
297 * transpose (size of a row) is done for B.
299 const glsl_type
*const type
=
300 glsl_type::get_instance(type_a
->base_type
,
301 type_a
->column_type()->vector_elements
,
302 type_b
->row_type()->vector_elements
);
303 assert(type
!= glsl_type::error_type
);
307 } else if (type_a
->is_matrix()) {
308 /* A is a matrix and B is a column vector. Columns of A must match
309 * rows of B. Given the other previously tested constraints, this
310 * means the vector type of a row from A must be the same as the
311 * vector the type of B.
313 if (type_a
->row_type() == type_b
) {
314 /* The resulting vector has a number of elements equal to
315 * the number of rows of matrix A. */
316 const glsl_type
*const type
=
317 glsl_type::get_instance(type_a
->base_type
,
318 type_a
->column_type()->vector_elements
,
320 assert(type
!= glsl_type::error_type
);
325 assert(type_b
->is_matrix());
327 /* A is a row vector and B is a matrix. Columns of A must match rows
328 * of B. Given the other previously tested constraints, this means
329 * the type of A must be the same as the vector type of a column from
332 if (type_a
== type_b
->column_type()) {
333 /* The resulting vector has a number of elements equal to
334 * the number of columns of matrix B. */
335 const glsl_type
*const type
=
336 glsl_type::get_instance(type_a
->base_type
,
337 type_b
->row_type()->vector_elements
,
339 assert(type
!= glsl_type::error_type
);
345 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
346 return glsl_type::error_type
;
350 /* "All other cases are illegal."
352 _mesa_glsl_error(loc
, state
, "type mismatch");
353 return glsl_type::error_type
;
357 static const struct glsl_type
*
358 unary_arithmetic_result_type(const struct glsl_type
*type
,
359 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
361 /* From GLSL 1.50 spec, page 57:
363 * "The arithmetic unary operators negate (-), post- and pre-increment
364 * and decrement (-- and ++) operate on integer or floating-point
365 * values (including vectors and matrices). All unary operators work
366 * component-wise on their operands. These result with the same type
369 if (!type
->is_numeric()) {
370 _mesa_glsl_error(loc
, state
,
371 "Operands to arithmetic operators must be numeric");
372 return glsl_type::error_type
;
379 * \brief Return the result type of a bit-logic operation.
381 * If the given types to the bit-logic operator are invalid, return
382 * glsl_type::error_type.
384 * \param type_a Type of LHS of bit-logic op
385 * \param type_b Type of RHS of bit-logic op
387 static const struct glsl_type
*
388 bit_logic_result_type(const struct glsl_type
*type_a
,
389 const struct glsl_type
*type_b
,
391 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
393 if (!state
->check_bitwise_operations_allowed(loc
)) {
394 return glsl_type::error_type
;
397 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
399 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
400 * (|). The operands must be of type signed or unsigned integers or
403 if (!type_a
->is_integer()) {
404 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
405 ast_expression::operator_string(op
));
406 return glsl_type::error_type
;
408 if (!type_b
->is_integer()) {
409 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
410 ast_expression::operator_string(op
));
411 return glsl_type::error_type
;
414 /* "The fundamental types of the operands (signed or unsigned) must
417 if (type_a
->base_type
!= type_b
->base_type
) {
418 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
419 "base type", ast_expression::operator_string(op
));
420 return glsl_type::error_type
;
423 /* "The operands cannot be vectors of differing size." */
424 if (type_a
->is_vector() &&
425 type_b
->is_vector() &&
426 type_a
->vector_elements
!= type_b
->vector_elements
) {
427 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
428 "different sizes", ast_expression::operator_string(op
));
429 return glsl_type::error_type
;
432 /* "If one operand is a scalar and the other a vector, the scalar is
433 * applied component-wise to the vector, resulting in the same type as
434 * the vector. The fundamental types of the operands [...] will be the
435 * resulting fundamental type."
437 if (type_a
->is_scalar())
443 static const struct glsl_type
*
444 modulus_result_type(const struct glsl_type
*type_a
,
445 const struct glsl_type
*type_b
,
446 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
448 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
449 return glsl_type::error_type
;
452 /* From GLSL 1.50 spec, page 56:
453 * "The operator modulus (%) operates on signed or unsigned integers or
454 * integer vectors. The operand types must both be signed or both be
457 if (!type_a
->is_integer()) {
458 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
459 return glsl_type::error_type
;
461 if (!type_b
->is_integer()) {
462 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
463 return glsl_type::error_type
;
465 if (type_a
->base_type
!= type_b
->base_type
) {
466 _mesa_glsl_error(loc
, state
,
467 "operands of %% must have the same base type");
468 return glsl_type::error_type
;
471 /* "The operands cannot be vectors of differing size. If one operand is
472 * a scalar and the other vector, then the scalar is applied component-
473 * wise to the vector, resulting in the same type as the vector. If both
474 * are vectors of the same size, the result is computed component-wise."
476 if (type_a
->is_vector()) {
477 if (!type_b
->is_vector()
478 || (type_a
->vector_elements
== type_b
->vector_elements
))
483 /* "The operator modulus (%) is not defined for any other data types
484 * (non-integer types)."
486 _mesa_glsl_error(loc
, state
, "type mismatch");
487 return glsl_type::error_type
;
491 static const struct glsl_type
*
492 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
493 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
495 const glsl_type
*type_a
= value_a
->type
;
496 const glsl_type
*type_b
= value_b
->type
;
498 /* From GLSL 1.50 spec, page 56:
499 * "The relational operators greater than (>), less than (<), greater
500 * than or equal (>=), and less than or equal (<=) operate only on
501 * scalar integer and scalar floating-point expressions."
503 if (!type_a
->is_numeric()
504 || !type_b
->is_numeric()
505 || !type_a
->is_scalar()
506 || !type_b
->is_scalar()) {
507 _mesa_glsl_error(loc
, state
,
508 "Operands to relational operators must be scalar and "
510 return glsl_type::error_type
;
513 /* "Either the operands' types must match, or the conversions from
514 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
515 * operand, after which the types must match."
517 if (!apply_implicit_conversion(type_a
, value_b
, state
)
518 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
519 _mesa_glsl_error(loc
, state
,
520 "Could not implicitly convert operands to "
521 "relational operator");
522 return glsl_type::error_type
;
524 type_a
= value_a
->type
;
525 type_b
= value_b
->type
;
527 if (type_a
->base_type
!= type_b
->base_type
) {
528 _mesa_glsl_error(loc
, state
, "base type mismatch");
529 return glsl_type::error_type
;
532 /* "The result is scalar Boolean."
534 return glsl_type::bool_type
;
538 * \brief Return the result type of a bit-shift operation.
540 * If the given types to the bit-shift operator are invalid, return
541 * glsl_type::error_type.
543 * \param type_a Type of LHS of bit-shift op
544 * \param type_b Type of RHS of bit-shift op
546 static const struct glsl_type
*
547 shift_result_type(const struct glsl_type
*type_a
,
548 const struct glsl_type
*type_b
,
550 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
552 if (!state
->check_bitwise_operations_allowed(loc
)) {
553 return glsl_type::error_type
;
556 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
558 * "The shift operators (<<) and (>>). For both operators, the operands
559 * must be signed or unsigned integers or integer vectors. One operand
560 * can be signed while the other is unsigned."
562 if (!type_a
->is_integer()) {
563 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
564 "integer vector", ast_expression::operator_string(op
));
565 return glsl_type::error_type
;
568 if (!type_b
->is_integer()) {
569 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
570 "integer vector", ast_expression::operator_string(op
));
571 return glsl_type::error_type
;
574 /* "If the first operand is a scalar, the second operand has to be
577 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
578 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
579 "second must be scalar as well",
580 ast_expression::operator_string(op
));
581 return glsl_type::error_type
;
584 /* If both operands are vectors, check that they have same number of
587 if (type_a
->is_vector() &&
588 type_b
->is_vector() &&
589 type_a
->vector_elements
!= type_b
->vector_elements
) {
590 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
591 "have same number of elements",
592 ast_expression::operator_string(op
));
593 return glsl_type::error_type
;
596 /* "In all cases, the resulting type will be the same type as the left
603 * Validates that a value can be assigned to a location with a specified type
605 * Validates that \c rhs can be assigned to some location. If the types are
606 * not an exact match but an automatic conversion is possible, \c rhs will be
610 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
611 * Otherwise the actual RHS to be assigned will be returned. This may be
612 * \c rhs, or it may be \c rhs after some type conversion.
615 * In addition to being used for assignments, this function is used to
616 * type-check return values.
619 validate_assignment(struct _mesa_glsl_parse_state
*state
,
620 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
623 /* If there is already some error in the RHS, just return it. Anything
624 * else will lead to an avalanche of error message back to the user.
626 if (rhs
->type
->is_error())
629 /* If the types are identical, the assignment can trivially proceed.
631 if (rhs
->type
== lhs_type
)
634 /* If the array element types are the same and the size of the LHS is zero,
635 * the assignment is okay for initializers embedded in variable
638 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
639 * is handled by ir_dereference::is_lvalue.
641 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
642 && (lhs_type
->element_type() == rhs
->type
->element_type())
643 && (lhs_type
->array_size() == 0)) {
647 /* Check for implicit conversion in GLSL 1.20 */
648 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
649 if (rhs
->type
== lhs_type
)
657 mark_whole_array_access(ir_rvalue
*access
)
659 ir_dereference_variable
*deref
= access
->as_dereference_variable();
661 if (deref
&& deref
->var
) {
662 deref
->var
->max_array_access
= deref
->type
->length
- 1;
667 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
668 const char *non_lvalue_description
,
669 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
673 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
675 ir_variable
*lhs_var
= lhs
->variable_referenced();
677 lhs_var
->assigned
= true;
679 if (!error_emitted
) {
680 if (non_lvalue_description
!= NULL
) {
681 _mesa_glsl_error(&lhs_loc
, state
,
683 non_lvalue_description
);
684 error_emitted
= true;
685 } else if (lhs
->variable_referenced() != NULL
686 && lhs
->variable_referenced()->read_only
) {
687 _mesa_glsl_error(&lhs_loc
, state
,
688 "assignment to read-only variable '%s'",
689 lhs
->variable_referenced()->name
);
690 error_emitted
= true;
692 } else if (lhs
->type
->is_array() &&
693 !state
->check_version(120, 300, &lhs_loc
,
694 "whole array assignment forbidden")) {
695 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
697 * "Other binary or unary expressions, non-dereferenced
698 * arrays, function names, swizzles with repeated fields,
699 * and constants cannot be l-values."
701 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
703 error_emitted
= true;
704 } else if (!lhs
->is_lvalue()) {
705 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
706 error_emitted
= true;
711 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
712 if (new_rhs
== NULL
) {
713 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
717 /* If the LHS array was not declared with a size, it takes it size from
718 * the RHS. If the LHS is an l-value and a whole array, it must be a
719 * dereference of a variable. Any other case would require that the LHS
720 * is either not an l-value or not a whole array.
722 if (lhs
->type
->array_size() == 0) {
723 ir_dereference
*const d
= lhs
->as_dereference();
727 ir_variable
*const var
= d
->variable_referenced();
731 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
732 /* FINISHME: This should actually log the location of the RHS. */
733 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
735 var
->max_array_access
);
738 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
739 rhs
->type
->array_size());
742 mark_whole_array_access(rhs
);
743 mark_whole_array_access(lhs
);
746 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
747 * but not post_inc) need the converted assigned value as an rvalue
748 * to handle things like:
752 * So we always just store the computed value being assigned to a
753 * temporary and return a deref of that temporary. If the rvalue
754 * ends up not being used, the temp will get copy-propagated out.
756 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
758 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
759 instructions
->push_tail(var
);
760 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
761 deref_var
= new(ctx
) ir_dereference_variable(var
);
764 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
766 return new(ctx
) ir_dereference_variable(var
);
770 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
772 void *ctx
= ralloc_parent(lvalue
);
775 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
777 instructions
->push_tail(var
);
778 var
->mode
= ir_var_auto
;
780 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
783 return new(ctx
) ir_dereference_variable(var
);
788 ast_node::hir(exec_list
*instructions
,
789 struct _mesa_glsl_parse_state
*state
)
798 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
801 ir_rvalue
*cmp
= NULL
;
803 if (operation
== ir_binop_all_equal
)
804 join_op
= ir_binop_logic_and
;
806 join_op
= ir_binop_logic_or
;
808 switch (op0
->type
->base_type
) {
809 case GLSL_TYPE_FLOAT
:
813 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
815 case GLSL_TYPE_ARRAY
: {
816 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
817 ir_rvalue
*e0
, *e1
, *result
;
819 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
820 new(mem_ctx
) ir_constant(i
));
821 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
822 new(mem_ctx
) ir_constant(i
));
823 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
826 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
832 mark_whole_array_access(op0
);
833 mark_whole_array_access(op1
);
837 case GLSL_TYPE_STRUCT
: {
838 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
839 ir_rvalue
*e0
, *e1
, *result
;
840 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
842 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
844 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
846 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
849 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
857 case GLSL_TYPE_ERROR
:
859 case GLSL_TYPE_SAMPLER
:
860 case GLSL_TYPE_INTERFACE
:
861 /* I assume a comparison of a struct containing a sampler just
862 * ignores the sampler present in the type.
868 cmp
= new(mem_ctx
) ir_constant(true);
873 /* For logical operations, we want to ensure that the operands are
874 * scalar booleans. If it isn't, emit an error and return a constant
875 * boolean to avoid triggering cascading error messages.
878 get_scalar_boolean_operand(exec_list
*instructions
,
879 struct _mesa_glsl_parse_state
*state
,
880 ast_expression
*parent_expr
,
882 const char *operand_name
,
885 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
887 ir_rvalue
*val
= expr
->hir(instructions
, state
);
889 if (val
->type
->is_boolean() && val
->type
->is_scalar())
892 if (!*error_emitted
) {
893 YYLTYPE loc
= expr
->get_location();
894 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
896 parent_expr
->operator_string(parent_expr
->oper
));
897 *error_emitted
= true;
900 return new(ctx
) ir_constant(true);
904 * If name refers to a builtin array whose maximum allowed size is less than
905 * size, report an error and return true. Otherwise return false.
908 check_builtin_array_max_size(const char *name
, unsigned size
,
909 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
911 if ((strcmp("gl_TexCoord", name
) == 0)
912 && (size
> state
->Const
.MaxTextureCoords
)) {
913 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
915 * "The size [of gl_TexCoord] can be at most
916 * gl_MaxTextureCoords."
918 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
919 "be larger than gl_MaxTextureCoords (%u)\n",
920 state
->Const
.MaxTextureCoords
);
921 } else if (strcmp("gl_ClipDistance", name
) == 0
922 && size
> state
->Const
.MaxClipPlanes
) {
923 /* From section 7.1 (Vertex Shader Special Variables) of the
926 * "The gl_ClipDistance array is predeclared as unsized and
927 * must be sized by the shader either redeclaring it with a
928 * size or indexing it only with integral constant
929 * expressions. ... The size can be at most
930 * gl_MaxClipDistances."
932 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
933 "be larger than gl_MaxClipDistances (%u)\n",
934 state
->Const
.MaxClipPlanes
);
939 * Create the constant 1, of a which is appropriate for incrementing and
940 * decrementing values of the given GLSL type. For example, if type is vec4,
941 * this creates a constant value of 1.0 having type float.
943 * If the given type is invalid for increment and decrement operators, return
944 * a floating point 1--the error will be detected later.
947 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
949 switch (type
->base_type
) {
951 return new(ctx
) ir_constant((unsigned) 1);
953 return new(ctx
) ir_constant(1);
955 case GLSL_TYPE_FLOAT
:
956 return new(ctx
) ir_constant(1.0f
);
961 ast_expression::hir(exec_list
*instructions
,
962 struct _mesa_glsl_parse_state
*state
)
965 static const int operations
[AST_NUM_OPERATORS
] = {
966 -1, /* ast_assign doesn't convert to ir_expression. */
967 -1, /* ast_plus doesn't convert to ir_expression. */
991 /* Note: The following block of expression types actually convert
992 * to multiple IR instructions.
994 ir_binop_mul
, /* ast_mul_assign */
995 ir_binop_div
, /* ast_div_assign */
996 ir_binop_mod
, /* ast_mod_assign */
997 ir_binop_add
, /* ast_add_assign */
998 ir_binop_sub
, /* ast_sub_assign */
999 ir_binop_lshift
, /* ast_ls_assign */
1000 ir_binop_rshift
, /* ast_rs_assign */
1001 ir_binop_bit_and
, /* ast_and_assign */
1002 ir_binop_bit_xor
, /* ast_xor_assign */
1003 ir_binop_bit_or
, /* ast_or_assign */
1005 -1, /* ast_conditional doesn't convert to ir_expression. */
1006 ir_binop_add
, /* ast_pre_inc. */
1007 ir_binop_sub
, /* ast_pre_dec. */
1008 ir_binop_add
, /* ast_post_inc. */
1009 ir_binop_sub
, /* ast_post_dec. */
1010 -1, /* ast_field_selection doesn't conv to ir_expression. */
1011 -1, /* ast_array_index doesn't convert to ir_expression. */
1012 -1, /* ast_function_call doesn't conv to ir_expression. */
1013 -1, /* ast_identifier doesn't convert to ir_expression. */
1014 -1, /* ast_int_constant doesn't convert to ir_expression. */
1015 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1016 -1, /* ast_float_constant doesn't conv to ir_expression. */
1017 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1018 -1, /* ast_sequence doesn't convert to ir_expression. */
1020 ir_rvalue
*result
= NULL
;
1022 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1023 bool error_emitted
= false;
1026 loc
= this->get_location();
1028 switch (this->oper
) {
1030 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1031 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1033 result
= do_assignment(instructions
, state
,
1034 this->subexpressions
[0]->non_lvalue_description
,
1035 op
[0], op
[1], false,
1036 this->subexpressions
[0]->get_location());
1037 error_emitted
= result
->type
->is_error();
1042 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1044 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1046 error_emitted
= type
->is_error();
1052 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1054 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1056 error_emitted
= type
->is_error();
1058 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1066 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1067 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1069 type
= arithmetic_result_type(op
[0], op
[1],
1070 (this->oper
== ast_mul
),
1072 error_emitted
= type
->is_error();
1074 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1079 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1080 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1082 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1084 assert(operations
[this->oper
] == ir_binop_mod
);
1086 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1088 error_emitted
= type
->is_error();
1093 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1094 error_emitted
= true;
1097 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1098 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1099 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1101 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1103 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1110 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1111 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1113 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1115 /* The relational operators must either generate an error or result
1116 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1118 assert(type
->is_error()
1119 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1120 && type
->is_scalar()));
1122 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1124 error_emitted
= type
->is_error();
1129 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1130 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1132 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1134 * "The equality operators equal (==), and not equal (!=)
1135 * operate on all types. They result in a scalar Boolean. If
1136 * the operand types do not match, then there must be a
1137 * conversion from Section 4.1.10 "Implicit Conversions"
1138 * applied to one operand that can make them match, in which
1139 * case this conversion is done."
1141 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1142 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1143 || (op
[0]->type
!= op
[1]->type
)) {
1144 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1145 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1146 error_emitted
= true;
1147 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1148 !state
->check_version(120, 300, &loc
,
1149 "array comparisons forbidden")) {
1150 error_emitted
= true;
1153 if (error_emitted
) {
1154 result
= new(ctx
) ir_constant(false);
1156 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1157 assert(result
->type
== glsl_type::bool_type
);
1164 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1165 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1166 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1168 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1170 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1174 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1176 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1177 error_emitted
= true;
1180 if (!op
[0]->type
->is_integer()) {
1181 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1182 error_emitted
= true;
1185 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1186 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1189 case ast_logic_and
: {
1190 exec_list rhs_instructions
;
1191 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1192 "LHS", &error_emitted
);
1193 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1194 "RHS", &error_emitted
);
1196 if (rhs_instructions
.is_empty()) {
1197 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1198 type
= result
->type
;
1200 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1203 instructions
->push_tail(tmp
);
1205 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1206 instructions
->push_tail(stmt
);
1208 stmt
->then_instructions
.append_list(&rhs_instructions
);
1209 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1210 ir_assignment
*const then_assign
=
1211 new(ctx
) ir_assignment(then_deref
, op
[1]);
1212 stmt
->then_instructions
.push_tail(then_assign
);
1214 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1215 ir_assignment
*const else_assign
=
1216 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1217 stmt
->else_instructions
.push_tail(else_assign
);
1219 result
= new(ctx
) ir_dereference_variable(tmp
);
1225 case ast_logic_or
: {
1226 exec_list rhs_instructions
;
1227 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1228 "LHS", &error_emitted
);
1229 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1230 "RHS", &error_emitted
);
1232 if (rhs_instructions
.is_empty()) {
1233 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1234 type
= result
->type
;
1236 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1239 instructions
->push_tail(tmp
);
1241 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1242 instructions
->push_tail(stmt
);
1244 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1245 ir_assignment
*const then_assign
=
1246 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1247 stmt
->then_instructions
.push_tail(then_assign
);
1249 stmt
->else_instructions
.append_list(&rhs_instructions
);
1250 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1251 ir_assignment
*const else_assign
=
1252 new(ctx
) ir_assignment(else_deref
, op
[1]);
1253 stmt
->else_instructions
.push_tail(else_assign
);
1255 result
= new(ctx
) ir_dereference_variable(tmp
);
1262 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1264 * "The logical binary operators and (&&), or ( | | ), and
1265 * exclusive or (^^). They operate only on two Boolean
1266 * expressions and result in a Boolean expression."
1268 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1270 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1273 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1278 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1279 "operand", &error_emitted
);
1281 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1285 case ast_mul_assign
:
1286 case ast_div_assign
:
1287 case ast_add_assign
:
1288 case ast_sub_assign
: {
1289 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1290 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1292 type
= arithmetic_result_type(op
[0], op
[1],
1293 (this->oper
== ast_mul_assign
),
1296 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1299 result
= do_assignment(instructions
, state
,
1300 this->subexpressions
[0]->non_lvalue_description
,
1301 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1302 this->subexpressions
[0]->get_location());
1303 error_emitted
= (op
[0]->type
->is_error());
1305 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1306 * explicitly test for this because none of the binary expression
1307 * operators allow array operands either.
1313 case ast_mod_assign
: {
1314 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1315 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1317 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1319 assert(operations
[this->oper
] == ir_binop_mod
);
1321 ir_rvalue
*temp_rhs
;
1322 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1325 result
= do_assignment(instructions
, state
,
1326 this->subexpressions
[0]->non_lvalue_description
,
1327 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1328 this->subexpressions
[0]->get_location());
1329 error_emitted
= type
->is_error();
1334 case ast_rs_assign
: {
1335 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1336 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1337 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1339 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1340 type
, op
[0], op
[1]);
1341 result
= do_assignment(instructions
, state
,
1342 this->subexpressions
[0]->non_lvalue_description
,
1343 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1344 this->subexpressions
[0]->get_location());
1345 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1349 case ast_and_assign
:
1350 case ast_xor_assign
:
1351 case ast_or_assign
: {
1352 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1353 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1354 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1356 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1357 type
, op
[0], op
[1]);
1358 result
= do_assignment(instructions
, state
,
1359 this->subexpressions
[0]->non_lvalue_description
,
1360 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1361 this->subexpressions
[0]->get_location());
1362 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1366 case ast_conditional
: {
1367 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1369 * "The ternary selection operator (?:). It operates on three
1370 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1371 * first expression, which must result in a scalar Boolean."
1373 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1374 "condition", &error_emitted
);
1376 /* The :? operator is implemented by generating an anonymous temporary
1377 * followed by an if-statement. The last instruction in each branch of
1378 * the if-statement assigns a value to the anonymous temporary. This
1379 * temporary is the r-value of the expression.
1381 exec_list then_instructions
;
1382 exec_list else_instructions
;
1384 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1385 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1387 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1389 * "The second and third expressions can be any type, as
1390 * long their types match, or there is a conversion in
1391 * Section 4.1.10 "Implicit Conversions" that can be applied
1392 * to one of the expressions to make their types match. This
1393 * resulting matching type is the type of the entire
1396 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1397 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1398 || (op
[1]->type
!= op
[2]->type
)) {
1399 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1401 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1402 "operator must have matching types.");
1403 error_emitted
= true;
1404 type
= glsl_type::error_type
;
1409 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1411 * "The second and third expressions must be the same type, but can
1412 * be of any type other than an array."
1414 if (type
->is_array() &&
1415 !state
->check_version(120, 300, &loc
,
1416 "Second and third operands of ?: operator "
1417 "cannot be arrays")) {
1418 error_emitted
= true;
1421 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1422 ir_constant
*then_val
= op
[1]->constant_expression_value();
1423 ir_constant
*else_val
= op
[2]->constant_expression_value();
1425 if (then_instructions
.is_empty()
1426 && else_instructions
.is_empty()
1427 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1428 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1430 ir_variable
*const tmp
=
1431 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1432 instructions
->push_tail(tmp
);
1434 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1435 instructions
->push_tail(stmt
);
1437 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1438 ir_dereference
*const then_deref
=
1439 new(ctx
) ir_dereference_variable(tmp
);
1440 ir_assignment
*const then_assign
=
1441 new(ctx
) ir_assignment(then_deref
, op
[1]);
1442 stmt
->then_instructions
.push_tail(then_assign
);
1444 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1445 ir_dereference
*const else_deref
=
1446 new(ctx
) ir_dereference_variable(tmp
);
1447 ir_assignment
*const else_assign
=
1448 new(ctx
) ir_assignment(else_deref
, op
[2]);
1449 stmt
->else_instructions
.push_tail(else_assign
);
1451 result
= new(ctx
) ir_dereference_variable(tmp
);
1458 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1459 ? "pre-increment operation" : "pre-decrement operation";
1461 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1462 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1464 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1466 ir_rvalue
*temp_rhs
;
1467 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1470 result
= do_assignment(instructions
, state
,
1471 this->subexpressions
[0]->non_lvalue_description
,
1472 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1473 this->subexpressions
[0]->get_location());
1474 error_emitted
= op
[0]->type
->is_error();
1479 case ast_post_dec
: {
1480 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1481 ? "post-increment operation" : "post-decrement operation";
1482 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1483 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1485 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1487 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1489 ir_rvalue
*temp_rhs
;
1490 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1493 /* Get a temporary of a copy of the lvalue before it's modified.
1494 * This may get thrown away later.
1496 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1498 (void)do_assignment(instructions
, state
,
1499 this->subexpressions
[0]->non_lvalue_description
,
1500 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1501 this->subexpressions
[0]->get_location());
1503 error_emitted
= op
[0]->type
->is_error();
1507 case ast_field_selection
:
1508 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1511 case ast_array_index
: {
1512 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1514 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1515 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1517 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1520 if (result
->type
->is_error())
1521 error_emitted
= true;
1526 case ast_function_call
:
1527 /* Should *NEVER* get here. ast_function_call should always be handled
1528 * by ast_function_expression::hir.
1533 case ast_identifier
: {
1534 /* ast_identifier can appear several places in a full abstract syntax
1535 * tree. This particular use must be at location specified in the grammar
1536 * as 'variable_identifier'.
1539 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1543 result
= new(ctx
) ir_dereference_variable(var
);
1545 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1546 this->primary_expression
.identifier
);
1548 result
= ir_rvalue::error_value(ctx
);
1549 error_emitted
= true;
1554 case ast_int_constant
:
1555 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1558 case ast_uint_constant
:
1559 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1562 case ast_float_constant
:
1563 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1566 case ast_bool_constant
:
1567 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1570 case ast_sequence
: {
1571 /* It should not be possible to generate a sequence in the AST without
1572 * any expressions in it.
1574 assert(!this->expressions
.is_empty());
1576 /* The r-value of a sequence is the last expression in the sequence. If
1577 * the other expressions in the sequence do not have side-effects (and
1578 * therefore add instructions to the instruction list), they get dropped
1581 exec_node
*previous_tail_pred
= NULL
;
1582 YYLTYPE previous_operand_loc
= loc
;
1584 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1585 /* If one of the operands of comma operator does not generate any
1586 * code, we want to emit a warning. At each pass through the loop
1587 * previous_tail_pred will point to the last instruction in the
1588 * stream *before* processing the previous operand. Naturally,
1589 * instructions->tail_pred will point to the last instruction in the
1590 * stream *after* processing the previous operand. If the two
1591 * pointers match, then the previous operand had no effect.
1593 * The warning behavior here differs slightly from GCC. GCC will
1594 * only emit a warning if none of the left-hand operands have an
1595 * effect. However, it will emit a warning for each. I believe that
1596 * there are some cases in C (especially with GCC extensions) where
1597 * it is useful to have an intermediate step in a sequence have no
1598 * effect, but I don't think these cases exist in GLSL. Either way,
1599 * it would be a giant hassle to replicate that behavior.
1601 if (previous_tail_pred
== instructions
->tail_pred
) {
1602 _mesa_glsl_warning(&previous_operand_loc
, state
,
1603 "left-hand operand of comma expression has "
1607 /* tail_pred is directly accessed instead of using the get_tail()
1608 * method for performance reasons. get_tail() has extra code to
1609 * return NULL when the list is empty. We don't care about that
1610 * here, so using tail_pred directly is fine.
1612 previous_tail_pred
= instructions
->tail_pred
;
1613 previous_operand_loc
= ast
->get_location();
1615 result
= ast
->hir(instructions
, state
);
1618 /* Any errors should have already been emitted in the loop above.
1620 error_emitted
= true;
1624 type
= NULL
; /* use result->type, not type. */
1625 assert(result
!= NULL
);
1627 if (result
->type
->is_error() && !error_emitted
)
1628 _mesa_glsl_error(& loc
, state
, "type mismatch");
1635 ast_expression_statement::hir(exec_list
*instructions
,
1636 struct _mesa_glsl_parse_state
*state
)
1638 /* It is possible to have expression statements that don't have an
1639 * expression. This is the solitary semicolon:
1641 * for (i = 0; i < 5; i++)
1644 * In this case the expression will be NULL. Test for NULL and don't do
1645 * anything in that case.
1647 if (expression
!= NULL
)
1648 expression
->hir(instructions
, state
);
1650 /* Statements do not have r-values.
1657 ast_compound_statement::hir(exec_list
*instructions
,
1658 struct _mesa_glsl_parse_state
*state
)
1661 state
->symbols
->push_scope();
1663 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1664 ast
->hir(instructions
, state
);
1667 state
->symbols
->pop_scope();
1669 /* Compound statements do not have r-values.
1675 static const glsl_type
*
1676 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1677 struct _mesa_glsl_parse_state
*state
)
1679 unsigned length
= 0;
1681 /* From page 19 (page 25) of the GLSL 1.20 spec:
1683 * "Only one-dimensional arrays may be declared."
1685 if (base
->is_array()) {
1686 _mesa_glsl_error(loc
, state
,
1687 "invalid array of `%s' (only one-dimensional arrays "
1690 return glsl_type::error_type
;
1693 if (array_size
!= NULL
) {
1694 exec_list dummy_instructions
;
1695 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1696 YYLTYPE loc
= array_size
->get_location();
1699 if (!ir
->type
->is_integer()) {
1700 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1701 } else if (!ir
->type
->is_scalar()) {
1702 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1704 ir_constant
*const size
= ir
->constant_expression_value();
1707 _mesa_glsl_error(& loc
, state
, "array size must be a "
1708 "constant valued expression");
1709 } else if (size
->value
.i
[0] <= 0) {
1710 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1712 assert(size
->type
== ir
->type
);
1713 length
= size
->value
.u
[0];
1715 /* If the array size is const (and we've verified that
1716 * it is) then no instructions should have been emitted
1717 * when we converted it to HIR. If they were emitted,
1718 * then either the array size isn't const after all, or
1719 * we are emitting unnecessary instructions.
1721 assert(dummy_instructions
.is_empty());
1725 } else if (state
->es_shader
) {
1726 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1727 * array declarations have been removed from the language.
1729 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1730 "allowed in GLSL ES 1.00.");
1733 return glsl_type::get_array_instance(base
, length
);
1738 ast_type_specifier::glsl_type(const char **name
,
1739 struct _mesa_glsl_parse_state
*state
) const
1741 const struct glsl_type
*type
;
1743 type
= state
->symbols
->get_type(this->type_name
);
1744 *name
= this->type_name
;
1746 if (this->is_array
) {
1747 YYLTYPE loc
= this->get_location();
1748 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1756 * Determine whether a toplevel variable declaration declares a varying. This
1757 * function operates by examining the variable's mode and the shader target,
1758 * so it correctly identifies linkage variables regardless of whether they are
1759 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1761 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1762 * this function will produce undefined results.
1765 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1769 return var
->mode
== ir_var_shader_out
;
1770 case fragment_shader
:
1771 return var
->mode
== ir_var_shader_in
;
1773 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1779 * Matrix layout qualifiers are only allowed on certain types
1782 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1784 const glsl_type
*type
)
1786 if (!type
->is_matrix() && !type
->is_record()) {
1787 _mesa_glsl_error(loc
, state
,
1788 "uniform block layout qualifiers row_major and "
1789 "column_major can only be applied to matrix and "
1791 } else if (type
->is_record()) {
1792 /* We allow 'layout(row_major)' on structure types because it's the only
1793 * way to get row-major layouts on matrices contained in structures.
1795 _mesa_glsl_warning(loc
, state
,
1796 "uniform block layout qualifiers row_major and "
1797 "column_major applied to structure types is not "
1798 "strictly conformant and my be rejected by other "
1804 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1806 struct _mesa_glsl_parse_state
*state
,
1808 bool ubo_qualifiers_valid
,
1811 if (qual
->flags
.q
.invariant
) {
1813 _mesa_glsl_error(loc
, state
,
1814 "variable `%s' may not be redeclared "
1815 "`invariant' after being used",
1822 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1823 || qual
->flags
.q
.uniform
1824 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1827 if (qual
->flags
.q
.centroid
)
1830 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1831 var
->type
= glsl_type::error_type
;
1832 _mesa_glsl_error(loc
, state
,
1833 "`attribute' variables may not be declared in the "
1835 _mesa_glsl_shader_target_name(state
->target
));
1838 /* If there is no qualifier that changes the mode of the variable, leave
1839 * the setting alone.
1841 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1842 var
->mode
= ir_var_function_inout
;
1843 else if (qual
->flags
.q
.in
)
1844 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
1845 else if (qual
->flags
.q
.attribute
1846 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1847 var
->mode
= ir_var_shader_in
;
1848 else if (qual
->flags
.q
.out
)
1849 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
1850 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
1851 var
->mode
= ir_var_shader_out
;
1852 else if (qual
->flags
.q
.uniform
)
1853 var
->mode
= ir_var_uniform
;
1855 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
1856 /* This variable is being used to link data between shader stages (in
1857 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
1858 * that is allowed for such purposes.
1860 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1862 * "The varying qualifier can be used only with the data types
1863 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1866 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
1867 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
1869 * "Fragment inputs can only be signed and unsigned integers and
1870 * integer vectors, float, floating-point vectors, matrices, or
1871 * arrays of these. Structures cannot be input.
1873 * Similar text exists in the section on vertex shader outputs.
1875 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
1876 * 3.00 spec allows structs as well. Varying structs are also allowed
1879 switch (var
->type
->get_scalar_type()->base_type
) {
1880 case GLSL_TYPE_FLOAT
:
1881 /* Ok in all GLSL versions */
1883 case GLSL_TYPE_UINT
:
1885 if (state
->is_version(130, 300))
1887 _mesa_glsl_error(loc
, state
,
1888 "varying variables must be of base type float in %s",
1889 state
->get_version_string());
1891 case GLSL_TYPE_STRUCT
:
1892 if (state
->is_version(150, 300))
1894 _mesa_glsl_error(loc
, state
,
1895 "varying variables may not be of type struct");
1898 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
1903 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1904 switch (state
->target
) {
1906 if (var
->mode
== ir_var_shader_out
)
1907 var
->invariant
= true;
1909 case geometry_shader
:
1910 if ((var
->mode
== ir_var_shader_in
)
1911 || (var
->mode
== ir_var_shader_out
))
1912 var
->invariant
= true;
1914 case fragment_shader
:
1915 if (var
->mode
== ir_var_shader_in
)
1916 var
->invariant
= true;
1921 if (qual
->flags
.q
.flat
)
1922 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
1923 else if (qual
->flags
.q
.noperspective
)
1924 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
1925 else if (qual
->flags
.q
.smooth
)
1926 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
1928 var
->interpolation
= INTERP_QUALIFIER_NONE
;
1930 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
1931 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
) &&
1932 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)) {
1933 _mesa_glsl_error(loc
, state
,
1934 "interpolation qualifier `%s' can only be applied to "
1935 "vertex shader outputs and fragment shader inputs.",
1936 var
->interpolation_string());
1939 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1940 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1941 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1942 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1943 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1944 ? "origin_upper_left" : "pixel_center_integer";
1946 _mesa_glsl_error(loc
, state
,
1947 "layout qualifier `%s' can only be applied to "
1948 "fragment shader input `gl_FragCoord'",
1952 if (qual
->flags
.q
.explicit_location
) {
1953 const bool global_scope
= (state
->current_function
== NULL
);
1955 const char *string
= "";
1957 /* In the vertex shader only shader inputs can be given explicit
1960 * In the fragment shader only shader outputs can be given explicit
1963 switch (state
->target
) {
1965 if (!global_scope
|| (var
->mode
!= ir_var_shader_in
)) {
1971 case geometry_shader
:
1972 _mesa_glsl_error(loc
, state
,
1973 "geometry shader variables cannot be given "
1974 "explicit locations\n");
1977 case fragment_shader
:
1978 if (!global_scope
|| (var
->mode
!= ir_var_shader_out
)) {
1986 _mesa_glsl_error(loc
, state
,
1987 "only %s shader %s variables can be given an "
1988 "explicit location\n",
1989 _mesa_glsl_shader_target_name(state
->target
),
1992 var
->explicit_location
= true;
1994 /* This bit of silliness is needed because invalid explicit locations
1995 * are supposed to be flagged during linking. Small negative values
1996 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
1997 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
1998 * The linker needs to be able to differentiate these cases. This
1999 * ensures that negative values stay negative.
2001 if (qual
->location
>= 0) {
2002 var
->location
= (state
->target
== vertex_shader
)
2003 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2004 : (qual
->location
+ FRAG_RESULT_DATA0
);
2006 var
->location
= qual
->location
;
2009 if (qual
->flags
.q
.explicit_index
) {
2010 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2011 * Layout Qualifiers):
2013 * "It is also a compile-time error if a fragment shader
2014 * sets a layout index to less than 0 or greater than 1."
2016 * Older specifications don't mandate a behavior; we take
2017 * this as a clarification and always generate the error.
2019 if (qual
->index
< 0 || qual
->index
> 1) {
2020 _mesa_glsl_error(loc
, state
,
2021 "explicit index may only be 0 or 1\n");
2023 var
->explicit_index
= true;
2024 var
->index
= qual
->index
;
2028 } else if (qual
->flags
.q
.explicit_index
) {
2029 _mesa_glsl_error(loc
, state
,
2030 "explicit index requires explicit location\n");
2033 /* Does the declaration use the 'layout' keyword?
2035 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2036 || qual
->flags
.q
.origin_upper_left
2037 || qual
->flags
.q
.explicit_location
; /* no need for index since it relies on location */
2039 /* Does the declaration use the deprecated 'attribute' or 'varying'
2042 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2043 || qual
->flags
.q
.varying
;
2045 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2046 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2047 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2048 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2049 * These extensions and all following extensions that add the 'layout'
2050 * keyword have been modified to require the use of 'in' or 'out'.
2052 * The following extension do not allow the deprecated keywords:
2054 * GL_AMD_conservative_depth
2055 * GL_ARB_conservative_depth
2056 * GL_ARB_gpu_shader5
2057 * GL_ARB_separate_shader_objects
2058 * GL_ARB_tesselation_shader
2059 * GL_ARB_transform_feedback3
2060 * GL_ARB_uniform_buffer_object
2062 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2063 * allow layout with the deprecated keywords.
2065 const bool relaxed_layout_qualifier_checking
=
2066 state
->ARB_fragment_coord_conventions_enable
;
2068 if (uses_layout
&& uses_deprecated_qualifier
) {
2069 if (relaxed_layout_qualifier_checking
) {
2070 _mesa_glsl_warning(loc
, state
,
2071 "`layout' qualifier may not be used with "
2072 "`attribute' or `varying'");
2074 _mesa_glsl_error(loc
, state
,
2075 "`layout' qualifier may not be used with "
2076 "`attribute' or `varying'");
2080 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2081 * AMD_conservative_depth.
2083 int depth_layout_count
= qual
->flags
.q
.depth_any
2084 + qual
->flags
.q
.depth_greater
2085 + qual
->flags
.q
.depth_less
2086 + qual
->flags
.q
.depth_unchanged
;
2087 if (depth_layout_count
> 0
2088 && !state
->AMD_conservative_depth_enable
2089 && !state
->ARB_conservative_depth_enable
) {
2090 _mesa_glsl_error(loc
, state
,
2091 "extension GL_AMD_conservative_depth or "
2092 "GL_ARB_conservative_depth must be enabled "
2093 "to use depth layout qualifiers");
2094 } else if (depth_layout_count
> 0
2095 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2096 _mesa_glsl_error(loc
, state
,
2097 "depth layout qualifiers can be applied only to "
2099 } else if (depth_layout_count
> 1
2100 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2101 _mesa_glsl_error(loc
, state
,
2102 "at most one depth layout qualifier can be applied to "
2105 if (qual
->flags
.q
.depth_any
)
2106 var
->depth_layout
= ir_depth_layout_any
;
2107 else if (qual
->flags
.q
.depth_greater
)
2108 var
->depth_layout
= ir_depth_layout_greater
;
2109 else if (qual
->flags
.q
.depth_less
)
2110 var
->depth_layout
= ir_depth_layout_less
;
2111 else if (qual
->flags
.q
.depth_unchanged
)
2112 var
->depth_layout
= ir_depth_layout_unchanged
;
2114 var
->depth_layout
= ir_depth_layout_none
;
2116 if (qual
->flags
.q
.std140
||
2117 qual
->flags
.q
.packed
||
2118 qual
->flags
.q
.shared
) {
2119 _mesa_glsl_error(loc
, state
,
2120 "uniform block layout qualifiers std140, packed, and "
2121 "shared can only be applied to uniform blocks, not "
2125 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2126 if (!ubo_qualifiers_valid
) {
2127 _mesa_glsl_error(loc
, state
,
2128 "uniform block layout qualifiers row_major and "
2129 "column_major can only be applied to uniform block "
2132 validate_matrix_layout_for_type(state
, loc
, var
->type
);
2137 * Get the variable that is being redeclared by this declaration
2139 * Semantic checks to verify the validity of the redeclaration are also
2140 * performed. If semantic checks fail, compilation error will be emitted via
2141 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2144 * A pointer to an existing variable in the current scope if the declaration
2145 * is a redeclaration, \c NULL otherwise.
2148 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2149 struct _mesa_glsl_parse_state
*state
)
2151 /* Check if this declaration is actually a re-declaration, either to
2152 * resize an array or add qualifiers to an existing variable.
2154 * This is allowed for variables in the current scope, or when at
2155 * global scope (for built-ins in the implicit outer scope).
2157 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2158 if (earlier
== NULL
||
2159 (state
->current_function
!= NULL
&&
2160 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2165 YYLTYPE loc
= decl
->get_location();
2167 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2169 * "It is legal to declare an array without a size and then
2170 * later re-declare the same name as an array of the same
2171 * type and specify a size."
2173 if ((earlier
->type
->array_size() == 0)
2174 && var
->type
->is_array()
2175 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2176 /* FINISHME: This doesn't match the qualifiers on the two
2177 * FINISHME: declarations. It's not 100% clear whether this is
2178 * FINISHME: required or not.
2181 const unsigned size
= unsigned(var
->type
->array_size());
2182 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2183 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2184 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2186 earlier
->max_array_access
);
2189 earlier
->type
= var
->type
;
2192 } else if (state
->ARB_fragment_coord_conventions_enable
2193 && strcmp(var
->name
, "gl_FragCoord") == 0
2194 && earlier
->type
== var
->type
2195 && earlier
->mode
== var
->mode
) {
2196 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2199 earlier
->origin_upper_left
= var
->origin_upper_left
;
2200 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2202 /* According to section 4.3.7 of the GLSL 1.30 spec,
2203 * the following built-in varaibles can be redeclared with an
2204 * interpolation qualifier:
2207 * * gl_FrontSecondaryColor
2208 * * gl_BackSecondaryColor
2210 * * gl_SecondaryColor
2212 } else if (state
->is_version(130, 0)
2213 && (strcmp(var
->name
, "gl_FrontColor") == 0
2214 || strcmp(var
->name
, "gl_BackColor") == 0
2215 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2216 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2217 || strcmp(var
->name
, "gl_Color") == 0
2218 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2219 && earlier
->type
== var
->type
2220 && earlier
->mode
== var
->mode
) {
2221 earlier
->interpolation
= var
->interpolation
;
2223 /* Layout qualifiers for gl_FragDepth. */
2224 } else if ((state
->AMD_conservative_depth_enable
||
2225 state
->ARB_conservative_depth_enable
)
2226 && strcmp(var
->name
, "gl_FragDepth") == 0
2227 && earlier
->type
== var
->type
2228 && earlier
->mode
== var
->mode
) {
2230 /** From the AMD_conservative_depth spec:
2231 * Within any shader, the first redeclarations of gl_FragDepth
2232 * must appear before any use of gl_FragDepth.
2234 if (earlier
->used
) {
2235 _mesa_glsl_error(&loc
, state
,
2236 "the first redeclaration of gl_FragDepth "
2237 "must appear before any use of gl_FragDepth");
2240 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2241 if (earlier
->depth_layout
!= ir_depth_layout_none
2242 && earlier
->depth_layout
!= var
->depth_layout
) {
2243 _mesa_glsl_error(&loc
, state
,
2244 "gl_FragDepth: depth layout is declared here "
2245 "as '%s, but it was previously declared as "
2247 depth_layout_string(var
->depth_layout
),
2248 depth_layout_string(earlier
->depth_layout
));
2251 earlier
->depth_layout
= var
->depth_layout
;
2254 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2261 * Generate the IR for an initializer in a variable declaration
2264 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2265 ast_fully_specified_type
*type
,
2266 exec_list
*initializer_instructions
,
2267 struct _mesa_glsl_parse_state
*state
)
2269 ir_rvalue
*result
= NULL
;
2271 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2273 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2275 * "All uniform variables are read-only and are initialized either
2276 * directly by an application via API commands, or indirectly by
2279 if (var
->mode
== ir_var_uniform
) {
2280 state
->check_version(120, 0, &initializer_loc
,
2281 "cannot initialize uniforms");
2284 if (var
->type
->is_sampler()) {
2285 _mesa_glsl_error(& initializer_loc
, state
,
2286 "cannot initialize samplers");
2289 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2290 _mesa_glsl_error(& initializer_loc
, state
,
2291 "cannot initialize %s shader input / %s",
2292 _mesa_glsl_shader_target_name(state
->target
),
2293 (state
->target
== vertex_shader
)
2294 ? "attribute" : "varying");
2297 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2298 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2301 /* Calculate the constant value if this is a const or uniform
2304 if (type
->qualifier
.flags
.q
.constant
2305 || type
->qualifier
.flags
.q
.uniform
) {
2306 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2307 if (new_rhs
!= NULL
) {
2310 ir_constant
*constant_value
= rhs
->constant_expression_value();
2311 if (!constant_value
) {
2312 _mesa_glsl_error(& initializer_loc
, state
,
2313 "initializer of %s variable `%s' must be a "
2314 "constant expression",
2315 (type
->qualifier
.flags
.q
.constant
)
2316 ? "const" : "uniform",
2318 if (var
->type
->is_numeric()) {
2319 /* Reduce cascading errors. */
2320 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2323 rhs
= constant_value
;
2324 var
->constant_value
= constant_value
;
2327 _mesa_glsl_error(&initializer_loc
, state
,
2328 "initializer of type %s cannot be assigned to "
2329 "variable of type %s",
2330 rhs
->type
->name
, var
->type
->name
);
2331 if (var
->type
->is_numeric()) {
2332 /* Reduce cascading errors. */
2333 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2338 if (rhs
&& !rhs
->type
->is_error()) {
2339 bool temp
= var
->read_only
;
2340 if (type
->qualifier
.flags
.q
.constant
)
2341 var
->read_only
= false;
2343 /* Never emit code to initialize a uniform.
2345 const glsl_type
*initializer_type
;
2346 if (!type
->qualifier
.flags
.q
.uniform
) {
2347 result
= do_assignment(initializer_instructions
, state
,
2350 type
->get_location());
2351 initializer_type
= result
->type
;
2353 initializer_type
= rhs
->type
;
2355 var
->constant_initializer
= rhs
->constant_expression_value();
2356 var
->has_initializer
= true;
2358 /* If the declared variable is an unsized array, it must inherrit
2359 * its full type from the initializer. A declaration such as
2361 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2365 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2367 * The assignment generated in the if-statement (below) will also
2368 * automatically handle this case for non-uniforms.
2370 * If the declared variable is not an array, the types must
2371 * already match exactly. As a result, the type assignment
2372 * here can be done unconditionally. For non-uniforms the call
2373 * to do_assignment can change the type of the initializer (via
2374 * the implicit conversion rules). For uniforms the initializer
2375 * must be a constant expression, and the type of that expression
2376 * was validated above.
2378 var
->type
= initializer_type
;
2380 var
->read_only
= temp
;
2387 ast_declarator_list::hir(exec_list
*instructions
,
2388 struct _mesa_glsl_parse_state
*state
)
2391 const struct glsl_type
*decl_type
;
2392 const char *type_name
= NULL
;
2393 ir_rvalue
*result
= NULL
;
2394 YYLTYPE loc
= this->get_location();
2396 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2398 * "To ensure that a particular output variable is invariant, it is
2399 * necessary to use the invariant qualifier. It can either be used to
2400 * qualify a previously declared variable as being invariant
2402 * invariant gl_Position; // make existing gl_Position be invariant"
2404 * In these cases the parser will set the 'invariant' flag in the declarator
2405 * list, and the type will be NULL.
2407 if (this->invariant
) {
2408 assert(this->type
== NULL
);
2410 if (state
->current_function
!= NULL
) {
2411 _mesa_glsl_error(& loc
, state
,
2412 "All uses of `invariant' keyword must be at global "
2416 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2417 assert(!decl
->is_array
);
2418 assert(decl
->array_size
== NULL
);
2419 assert(decl
->initializer
== NULL
);
2421 ir_variable
*const earlier
=
2422 state
->symbols
->get_variable(decl
->identifier
);
2423 if (earlier
== NULL
) {
2424 _mesa_glsl_error(& loc
, state
,
2425 "Undeclared variable `%s' cannot be marked "
2426 "invariant\n", decl
->identifier
);
2427 } else if ((state
->target
== vertex_shader
)
2428 && (earlier
->mode
!= ir_var_shader_out
)) {
2429 _mesa_glsl_error(& loc
, state
,
2430 "`%s' cannot be marked invariant, vertex shader "
2431 "outputs only\n", decl
->identifier
);
2432 } else if ((state
->target
== fragment_shader
)
2433 && (earlier
->mode
!= ir_var_shader_in
)) {
2434 _mesa_glsl_error(& loc
, state
,
2435 "`%s' cannot be marked invariant, fragment shader "
2436 "inputs only\n", decl
->identifier
);
2437 } else if (earlier
->used
) {
2438 _mesa_glsl_error(& loc
, state
,
2439 "variable `%s' may not be redeclared "
2440 "`invariant' after being used",
2443 earlier
->invariant
= true;
2447 /* Invariant redeclarations do not have r-values.
2452 assert(this->type
!= NULL
);
2453 assert(!this->invariant
);
2455 /* The type specifier may contain a structure definition. Process that
2456 * before any of the variable declarations.
2458 (void) this->type
->specifier
->hir(instructions
, state
);
2460 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2461 if (this->declarations
.is_empty()) {
2462 /* If there is no structure involved in the program text, there are two
2463 * possible scenarios:
2465 * - The program text contained something like 'vec4;'. This is an
2466 * empty declaration. It is valid but weird. Emit a warning.
2468 * - The program text contained something like 'S;' and 'S' is not the
2469 * name of a known structure type. This is both invalid and weird.
2472 * Note that if decl_type is NULL and there is a structure involved,
2473 * there must have been some sort of error with the structure. In this
2474 * case we assume that an error was already generated on this line of
2475 * code for the structure. There is no need to generate an additional,
2478 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2480 if (this->type
->specifier
->structure
== NULL
) {
2481 if (decl_type
!= NULL
) {
2482 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2484 _mesa_glsl_error(&loc
, state
,
2485 "invalid type `%s' in empty declaration",
2491 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2492 const struct glsl_type
*var_type
;
2495 /* FINISHME: Emit a warning if a variable declaration shadows a
2496 * FINISHME: declaration at a higher scope.
2499 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2500 if (type_name
!= NULL
) {
2501 _mesa_glsl_error(& loc
, state
,
2502 "invalid type `%s' in declaration of `%s'",
2503 type_name
, decl
->identifier
);
2505 _mesa_glsl_error(& loc
, state
,
2506 "invalid type in declaration of `%s'",
2512 if (decl
->is_array
) {
2513 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2515 if (var_type
->is_error())
2518 var_type
= decl_type
;
2521 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2523 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2525 * "Global variables can only use the qualifiers const,
2526 * attribute, uni form, or varying. Only one may be
2529 * Local variables can only use the qualifier const."
2531 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2532 * any extension that adds the 'layout' keyword.
2534 if (!state
->is_version(130, 300)
2535 && !state
->ARB_explicit_attrib_location_enable
2536 && !state
->ARB_fragment_coord_conventions_enable
) {
2537 if (this->type
->qualifier
.flags
.q
.out
) {
2538 _mesa_glsl_error(& loc
, state
,
2539 "`out' qualifier in declaration of `%s' "
2540 "only valid for function parameters in %s.",
2541 decl
->identifier
, state
->get_version_string());
2543 if (this->type
->qualifier
.flags
.q
.in
) {
2544 _mesa_glsl_error(& loc
, state
,
2545 "`in' qualifier in declaration of `%s' "
2546 "only valid for function parameters in %s.",
2547 decl
->identifier
, state
->get_version_string());
2549 /* FINISHME: Test for other invalid qualifiers. */
2552 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2553 & loc
, this->ubo_qualifiers_valid
, false);
2555 if (this->type
->qualifier
.flags
.q
.invariant
) {
2556 if ((state
->target
== vertex_shader
) &&
2557 var
->mode
!= ir_var_shader_out
) {
2558 _mesa_glsl_error(& loc
, state
,
2559 "`%s' cannot be marked invariant, vertex shader "
2560 "outputs only\n", var
->name
);
2561 } else if ((state
->target
== fragment_shader
) &&
2562 var
->mode
!= ir_var_shader_in
) {
2563 /* FINISHME: Note that this doesn't work for invariant on
2564 * a function signature inval
2566 _mesa_glsl_error(& loc
, state
,
2567 "`%s' cannot be marked invariant, fragment shader "
2568 "inputs only\n", var
->name
);
2572 if (state
->current_function
!= NULL
) {
2573 const char *mode
= NULL
;
2574 const char *extra
= "";
2576 /* There is no need to check for 'inout' here because the parser will
2577 * only allow that in function parameter lists.
2579 if (this->type
->qualifier
.flags
.q
.attribute
) {
2581 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2583 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2585 } else if (this->type
->qualifier
.flags
.q
.in
) {
2587 extra
= " or in function parameter list";
2588 } else if (this->type
->qualifier
.flags
.q
.out
) {
2590 extra
= " or in function parameter list";
2594 _mesa_glsl_error(& loc
, state
,
2595 "%s variable `%s' must be declared at "
2597 mode
, var
->name
, extra
);
2599 } else if (var
->mode
== ir_var_shader_in
) {
2600 var
->read_only
= true;
2602 if (state
->target
== vertex_shader
) {
2603 bool error_emitted
= false;
2605 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2607 * "Vertex shader inputs can only be float, floating-point
2608 * vectors, matrices, signed and unsigned integers and integer
2609 * vectors. Vertex shader inputs can also form arrays of these
2610 * types, but not structures."
2612 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2614 * "Vertex shader inputs can only be float, floating-point
2615 * vectors, matrices, signed and unsigned integers and integer
2616 * vectors. They cannot be arrays or structures."
2618 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2620 * "The attribute qualifier can be used only with float,
2621 * floating-point vectors, and matrices. Attribute variables
2622 * cannot be declared as arrays or structures."
2624 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
2626 * "Vertex shader inputs can only be float, floating-point
2627 * vectors, matrices, signed and unsigned integers and integer
2628 * vectors. Vertex shader inputs cannot be arrays or
2631 const glsl_type
*check_type
= var
->type
->is_array()
2632 ? var
->type
->fields
.array
: var
->type
;
2634 switch (check_type
->base_type
) {
2635 case GLSL_TYPE_FLOAT
:
2637 case GLSL_TYPE_UINT
:
2639 if (state
->is_version(120, 300))
2643 _mesa_glsl_error(& loc
, state
,
2644 "vertex shader input / attribute cannot have "
2646 var
->type
->is_array() ? "array of " : "",
2648 error_emitted
= true;
2651 if (!error_emitted
&& var
->type
->is_array() &&
2652 !state
->check_version(140, 0, &loc
,
2653 "vertex shader input / attribute "
2654 "cannot have array type")) {
2655 error_emitted
= true;
2660 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2661 * so must integer vertex outputs.
2663 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2664 * "Fragment shader inputs that are signed or unsigned integers or
2665 * integer vectors must be qualified with the interpolation qualifier
2668 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2669 * "Fragment shader inputs that are, or contain, signed or unsigned
2670 * integers or integer vectors must be qualified with the
2671 * interpolation qualifier flat."
2673 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2674 * "Vertex shader outputs that are, or contain, signed or unsigned
2675 * integers or integer vectors must be qualified with the
2676 * interpolation qualifier flat."
2678 * Note that prior to GLSL 1.50, this requirement applied to vertex
2679 * outputs rather than fragment inputs. That creates problems in the
2680 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2681 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2682 * apply the restriction to both vertex outputs and fragment inputs.
2684 * Note also that the desktop GLSL specs are missing the text "or
2685 * contain"; this is presumably an oversight, since there is no
2686 * reasonable way to interpolate a fragment shader input that contains
2689 if (state
->is_version(130, 300) &&
2690 var
->type
->contains_integer() &&
2691 var
->interpolation
!= INTERP_QUALIFIER_FLAT
&&
2692 ((state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)
2693 || (state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
2694 && state
->es_shader
))) {
2695 const char *var_type
= (state
->target
== vertex_shader
) ?
2696 "vertex output" : "fragment input";
2697 _mesa_glsl_error(&loc
, state
, "If a %s is (or contains) "
2698 "an integer, then it must be qualified with 'flat'",
2703 /* Interpolation qualifiers cannot be applied to 'centroid' and
2704 * 'centroid varying'.
2706 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2707 * "interpolation qualifiers may only precede the qualifiers in,
2708 * centroid in, out, or centroid out in a declaration. They do not apply
2709 * to the deprecated storage qualifiers varying or centroid varying."
2711 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2713 if (state
->is_version(130, 0)
2714 && this->type
->qualifier
.has_interpolation()
2715 && this->type
->qualifier
.flags
.q
.varying
) {
2717 const char *i
= this->type
->qualifier
.interpolation_string();
2720 if (this->type
->qualifier
.flags
.q
.centroid
)
2721 s
= "centroid varying";
2725 _mesa_glsl_error(&loc
, state
,
2726 "qualifier '%s' cannot be applied to the "
2727 "deprecated storage qualifier '%s'", i
, s
);
2731 /* Interpolation qualifiers can only apply to vertex shader outputs and
2732 * fragment shader inputs.
2734 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2735 * "Outputs from a vertex shader (out) and inputs to a fragment
2736 * shader (in) can be further qualified with one or more of these
2737 * interpolation qualifiers"
2739 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
2740 * "These interpolation qualifiers may only precede the qualifiers
2741 * in, centroid in, out, or centroid out in a declaration. They do
2742 * not apply to inputs into a vertex shader or outputs from a
2745 if (state
->is_version(130, 300)
2746 && this->type
->qualifier
.has_interpolation()) {
2748 const char *i
= this->type
->qualifier
.interpolation_string();
2751 switch (state
->target
) {
2753 if (this->type
->qualifier
.flags
.q
.in
) {
2754 _mesa_glsl_error(&loc
, state
,
2755 "qualifier '%s' cannot be applied to vertex "
2756 "shader inputs", i
);
2759 case fragment_shader
:
2760 if (this->type
->qualifier
.flags
.q
.out
) {
2761 _mesa_glsl_error(&loc
, state
,
2762 "qualifier '%s' cannot be applied to fragment "
2763 "shader outputs", i
);
2772 /* From section 4.3.4 of the GLSL 1.30 spec:
2773 * "It is an error to use centroid in in a vertex shader."
2775 * From section 4.3.4 of the GLSL ES 3.00 spec:
2776 * "It is an error to use centroid in or interpolation qualifiers in
2777 * a vertex shader input."
2779 if (state
->is_version(130, 300)
2780 && this->type
->qualifier
.flags
.q
.centroid
2781 && this->type
->qualifier
.flags
.q
.in
2782 && state
->target
== vertex_shader
) {
2784 _mesa_glsl_error(&loc
, state
,
2785 "'centroid in' cannot be used in a vertex shader");
2789 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2791 if (this->type
->specifier
->precision
!= ast_precision_none
) {
2792 state
->check_precision_qualifiers_allowed(&loc
);
2796 /* Precision qualifiers only apply to floating point and integer types.
2798 * From section 4.5.2 of the GLSL 1.30 spec:
2799 * "Any floating point or any integer declaration can have the type
2800 * preceded by one of these precision qualifiers [...] Literal
2801 * constants do not have precision qualifiers. Neither do Boolean
2804 * In GLSL ES, sampler types are also allowed.
2806 * From page 87 of the GLSL ES spec:
2807 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2809 if (this->type
->specifier
->precision
!= ast_precision_none
2810 && !var
->type
->is_float()
2811 && !var
->type
->is_integer()
2812 && !(var
->type
->is_sampler() && state
->es_shader
)
2813 && !(var
->type
->is_array()
2814 && (var
->type
->fields
.array
->is_float()
2815 || var
->type
->fields
.array
->is_integer()))) {
2817 _mesa_glsl_error(&loc
, state
,
2818 "precision qualifiers apply only to floating point"
2819 "%s types", state
->es_shader
? ", integer, and sampler"
2823 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2825 * "[Sampler types] can only be declared as function
2826 * parameters or uniform variables (see Section 4.3.5
2829 if (var_type
->contains_sampler() &&
2830 !this->type
->qualifier
.flags
.q
.uniform
) {
2831 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2834 /* Process the initializer and add its instructions to a temporary
2835 * list. This list will be added to the instruction stream (below) after
2836 * the declaration is added. This is done because in some cases (such as
2837 * redeclarations) the declaration may not actually be added to the
2838 * instruction stream.
2840 exec_list initializer_instructions
;
2841 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2843 if (decl
->initializer
!= NULL
) {
2844 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2846 &initializer_instructions
, state
);
2849 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2851 * "It is an error to write to a const variable outside of
2852 * its declaration, so they must be initialized when
2855 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2856 _mesa_glsl_error(& loc
, state
,
2857 "const declaration of `%s' must be initialized",
2861 /* If the declaration is not a redeclaration, there are a few additional
2862 * semantic checks that must be applied. In addition, variable that was
2863 * created for the declaration should be added to the IR stream.
2865 if (earlier
== NULL
) {
2866 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2868 * "Identifiers starting with "gl_" are reserved for use by
2869 * OpenGL, and may not be declared in a shader as either a
2870 * variable or a function."
2872 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2873 _mesa_glsl_error(& loc
, state
,
2874 "identifier `%s' uses reserved `gl_' prefix",
2876 else if (strstr(decl
->identifier
, "__")) {
2877 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2880 * "In addition, all identifiers containing two
2881 * consecutive underscores (__) are reserved as
2882 * possible future keywords."
2884 _mesa_glsl_error(& loc
, state
,
2885 "identifier `%s' uses reserved `__' string",
2889 /* Add the variable to the symbol table. Note that the initializer's
2890 * IR was already processed earlier (though it hasn't been emitted
2891 * yet), without the variable in scope.
2893 * This differs from most C-like languages, but it follows the GLSL
2894 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2897 * "Within a declaration, the scope of a name starts immediately
2898 * after the initializer if present or immediately after the name
2899 * being declared if not."
2901 if (!state
->symbols
->add_variable(var
)) {
2902 YYLTYPE loc
= this->get_location();
2903 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2904 "current scope", decl
->identifier
);
2908 /* Push the variable declaration to the top. It means that all the
2909 * variable declarations will appear in a funny last-to-first order,
2910 * but otherwise we run into trouble if a function is prototyped, a
2911 * global var is decled, then the function is defined with usage of
2912 * the global var. See glslparsertest's CorrectModule.frag.
2914 instructions
->push_head(var
);
2917 instructions
->append_list(&initializer_instructions
);
2921 /* Generally, variable declarations do not have r-values. However,
2922 * one is used for the declaration in
2924 * while (bool b = some_condition()) {
2928 * so we return the rvalue from the last seen declaration here.
2935 ast_parameter_declarator::hir(exec_list
*instructions
,
2936 struct _mesa_glsl_parse_state
*state
)
2939 const struct glsl_type
*type
;
2940 const char *name
= NULL
;
2941 YYLTYPE loc
= this->get_location();
2943 type
= this->type
->specifier
->glsl_type(& name
, state
);
2947 _mesa_glsl_error(& loc
, state
,
2948 "invalid type `%s' in declaration of `%s'",
2949 name
, this->identifier
);
2951 _mesa_glsl_error(& loc
, state
,
2952 "invalid type in declaration of `%s'",
2956 type
= glsl_type::error_type
;
2959 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2961 * "Functions that accept no input arguments need not use void in the
2962 * argument list because prototypes (or definitions) are required and
2963 * therefore there is no ambiguity when an empty argument list "( )" is
2964 * declared. The idiom "(void)" as a parameter list is provided for
2967 * Placing this check here prevents a void parameter being set up
2968 * for a function, which avoids tripping up checks for main taking
2969 * parameters and lookups of an unnamed symbol.
2971 if (type
->is_void()) {
2972 if (this->identifier
!= NULL
)
2973 _mesa_glsl_error(& loc
, state
,
2974 "named parameter cannot have type `void'");
2980 if (formal_parameter
&& (this->identifier
== NULL
)) {
2981 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2985 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2986 * call already handled the "vec4[..] foo" case.
2988 if (this->is_array
) {
2989 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2992 if (!type
->is_error() && type
->array_size() == 0) {
2993 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2994 "a declared size.");
2995 type
= glsl_type::error_type
;
2999 ir_variable
*var
= new(ctx
)
3000 ir_variable(type
, this->identifier
, ir_var_function_in
);
3002 /* Apply any specified qualifiers to the parameter declaration. Note that
3003 * for function parameters the default mode is 'in'.
3005 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3008 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3010 * "Samplers cannot be treated as l-values; hence cannot be used
3011 * as out or inout function parameters, nor can they be assigned
3014 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3015 && type
->contains_sampler()) {
3016 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3017 type
= glsl_type::error_type
;
3020 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3022 * "When calling a function, expressions that do not evaluate to
3023 * l-values cannot be passed to parameters declared as out or inout."
3025 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3027 * "Other binary or unary expressions, non-dereferenced arrays,
3028 * function names, swizzles with repeated fields, and constants
3029 * cannot be l-values."
3031 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3032 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3034 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3036 && !state
->check_version(120, 100, &loc
,
3037 "Arrays cannot be out or inout parameters")) {
3038 type
= glsl_type::error_type
;
3041 instructions
->push_tail(var
);
3043 /* Parameter declarations do not have r-values.
3050 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3052 exec_list
*ir_parameters
,
3053 _mesa_glsl_parse_state
*state
)
3055 ast_parameter_declarator
*void_param
= NULL
;
3058 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3059 param
->formal_parameter
= formal
;
3060 param
->hir(ir_parameters
, state
);
3068 if ((void_param
!= NULL
) && (count
> 1)) {
3069 YYLTYPE loc
= void_param
->get_location();
3071 _mesa_glsl_error(& loc
, state
,
3072 "`void' parameter must be only parameter");
3078 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3080 /* IR invariants disallow function declarations or definitions
3081 * nested within other function definitions. But there is no
3082 * requirement about the relative order of function declarations
3083 * and definitions with respect to one another. So simply insert
3084 * the new ir_function block at the end of the toplevel instruction
3087 state
->toplevel_ir
->push_tail(f
);
3092 ast_function::hir(exec_list
*instructions
,
3093 struct _mesa_glsl_parse_state
*state
)
3096 ir_function
*f
= NULL
;
3097 ir_function_signature
*sig
= NULL
;
3098 exec_list hir_parameters
;
3100 const char *const name
= identifier
;
3102 /* New functions are always added to the top-level IR instruction stream,
3103 * so this instruction list pointer is ignored. See also emit_function
3106 (void) instructions
;
3108 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3110 * "Function declarations (prototypes) cannot occur inside of functions;
3111 * they must be at global scope, or for the built-in functions, outside
3112 * the global scope."
3114 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3116 * "User defined functions may only be defined within the global scope."
3118 * Note that this language does not appear in GLSL 1.10.
3120 if ((state
->current_function
!= NULL
) &&
3121 state
->is_version(120, 100)) {
3122 YYLTYPE loc
= this->get_location();
3123 _mesa_glsl_error(&loc
, state
,
3124 "declaration of function `%s' not allowed within "
3125 "function body", name
);
3128 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3130 * "Identifiers starting with "gl_" are reserved for use by
3131 * OpenGL, and may not be declared in a shader as either a
3132 * variable or a function."
3134 if (strncmp(name
, "gl_", 3) == 0) {
3135 YYLTYPE loc
= this->get_location();
3136 _mesa_glsl_error(&loc
, state
,
3137 "identifier `%s' uses reserved `gl_' prefix", name
);
3140 /* Convert the list of function parameters to HIR now so that they can be
3141 * used below to compare this function's signature with previously seen
3142 * signatures for functions with the same name.
3144 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3146 & hir_parameters
, state
);
3148 const char *return_type_name
;
3149 const glsl_type
*return_type
=
3150 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3153 YYLTYPE loc
= this->get_location();
3154 _mesa_glsl_error(&loc
, state
,
3155 "function `%s' has undeclared return type `%s'",
3156 name
, return_type_name
);
3157 return_type
= glsl_type::error_type
;
3160 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3161 * "No qualifier is allowed on the return type of a function."
3163 if (this->return_type
->has_qualifiers()) {
3164 YYLTYPE loc
= this->get_location();
3165 _mesa_glsl_error(& loc
, state
,
3166 "function `%s' return type has qualifiers", name
);
3169 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3171 * "[Sampler types] can only be declared as function parameters
3172 * or uniform variables (see Section 4.3.5 "Uniform")".
3174 if (return_type
->contains_sampler()) {
3175 YYLTYPE loc
= this->get_location();
3176 _mesa_glsl_error(&loc
, state
,
3177 "function `%s' return type can't contain a sampler",
3181 /* Verify that this function's signature either doesn't match a previously
3182 * seen signature for a function with the same name, or, if a match is found,
3183 * that the previously seen signature does not have an associated definition.
3185 f
= state
->symbols
->get_function(name
);
3186 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3187 sig
= f
->exact_matching_signature(&hir_parameters
);
3189 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3190 if (badvar
!= NULL
) {
3191 YYLTYPE loc
= this->get_location();
3193 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3194 "qualifiers don't match prototype", name
, badvar
);
3197 if (sig
->return_type
!= return_type
) {
3198 YYLTYPE loc
= this->get_location();
3200 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3201 "match prototype", name
);
3204 if (is_definition
&& sig
->is_defined
) {
3205 YYLTYPE loc
= this->get_location();
3207 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3211 f
= new(ctx
) ir_function(name
);
3212 if (!state
->symbols
->add_function(f
)) {
3213 /* This function name shadows a non-function use of the same name. */
3214 YYLTYPE loc
= this->get_location();
3216 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3217 "non-function", name
);
3221 emit_function(state
, f
);
3224 /* Verify the return type of main() */
3225 if (strcmp(name
, "main") == 0) {
3226 if (! return_type
->is_void()) {
3227 YYLTYPE loc
= this->get_location();
3229 _mesa_glsl_error(& loc
, state
, "main() must return void");
3232 if (!hir_parameters
.is_empty()) {
3233 YYLTYPE loc
= this->get_location();
3235 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3239 /* Finish storing the information about this new function in its signature.
3242 sig
= new(ctx
) ir_function_signature(return_type
);
3243 f
->add_signature(sig
);
3246 sig
->replace_parameters(&hir_parameters
);
3249 /* Function declarations (prototypes) do not have r-values.
3256 ast_function_definition::hir(exec_list
*instructions
,
3257 struct _mesa_glsl_parse_state
*state
)
3259 prototype
->is_definition
= true;
3260 prototype
->hir(instructions
, state
);
3262 ir_function_signature
*signature
= prototype
->signature
;
3263 if (signature
== NULL
)
3266 assert(state
->current_function
== NULL
);
3267 state
->current_function
= signature
;
3268 state
->found_return
= false;
3270 /* Duplicate parameters declared in the prototype as concrete variables.
3271 * Add these to the symbol table.
3273 state
->symbols
->push_scope();
3274 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3275 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3277 assert(var
!= NULL
);
3279 /* The only way a parameter would "exist" is if two parameters have
3282 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3283 YYLTYPE loc
= this->get_location();
3285 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3287 state
->symbols
->add_variable(var
);
3291 /* Convert the body of the function to HIR. */
3292 this->body
->hir(&signature
->body
, state
);
3293 signature
->is_defined
= true;
3295 state
->symbols
->pop_scope();
3297 assert(state
->current_function
== signature
);
3298 state
->current_function
= NULL
;
3300 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3301 YYLTYPE loc
= this->get_location();
3302 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3303 "%s, but no return statement",
3304 signature
->function_name(),
3305 signature
->return_type
->name
);
3308 /* Function definitions do not have r-values.
3315 ast_jump_statement::hir(exec_list
*instructions
,
3316 struct _mesa_glsl_parse_state
*state
)
3323 assert(state
->current_function
);
3325 if (opt_return_value
) {
3326 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3328 /* The value of the return type can be NULL if the shader says
3329 * 'return foo();' and foo() is a function that returns void.
3331 * NOTE: The GLSL spec doesn't say that this is an error. The type
3332 * of the return value is void. If the return type of the function is
3333 * also void, then this should compile without error. Seriously.
3335 const glsl_type
*const ret_type
=
3336 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3338 /* Implicit conversions are not allowed for return values. */
3339 if (state
->current_function
->return_type
!= ret_type
) {
3340 YYLTYPE loc
= this->get_location();
3342 _mesa_glsl_error(& loc
, state
,
3343 "`return' with wrong type %s, in function `%s' "
3346 state
->current_function
->function_name(),
3347 state
->current_function
->return_type
->name
);
3350 inst
= new(ctx
) ir_return(ret
);
3352 if (state
->current_function
->return_type
->base_type
!=
3354 YYLTYPE loc
= this->get_location();
3356 _mesa_glsl_error(& loc
, state
,
3357 "`return' with no value, in function %s returning "
3359 state
->current_function
->function_name());
3361 inst
= new(ctx
) ir_return
;
3364 state
->found_return
= true;
3365 instructions
->push_tail(inst
);
3370 if (state
->target
!= fragment_shader
) {
3371 YYLTYPE loc
= this->get_location();
3373 _mesa_glsl_error(& loc
, state
,
3374 "`discard' may only appear in a fragment shader");
3376 instructions
->push_tail(new(ctx
) ir_discard
);
3381 if (mode
== ast_continue
&&
3382 state
->loop_nesting_ast
== NULL
) {
3383 YYLTYPE loc
= this->get_location();
3385 _mesa_glsl_error(& loc
, state
,
3386 "continue may only appear in a loop");
3387 } else if (mode
== ast_break
&&
3388 state
->loop_nesting_ast
== NULL
&&
3389 state
->switch_state
.switch_nesting_ast
== NULL
) {
3390 YYLTYPE loc
= this->get_location();
3392 _mesa_glsl_error(& loc
, state
,
3393 "break may only appear in a loop or a switch");
3395 /* For a loop, inline the for loop expression again,
3396 * since we don't know where near the end of
3397 * the loop body the normal copy of it
3398 * is going to be placed.
3400 if (state
->loop_nesting_ast
!= NULL
&&
3401 mode
== ast_continue
&&
3402 state
->loop_nesting_ast
->rest_expression
) {
3403 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3407 if (state
->switch_state
.is_switch_innermost
&&
3408 mode
== ast_break
) {
3409 /* Force break out of switch by setting is_break switch state.
3411 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3412 ir_dereference_variable
*const deref_is_break_var
=
3413 new(ctx
) ir_dereference_variable(is_break_var
);
3414 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3415 ir_assignment
*const set_break_var
=
3416 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3418 instructions
->push_tail(set_break_var
);
3421 ir_loop_jump
*const jump
=
3422 new(ctx
) ir_loop_jump((mode
== ast_break
)
3423 ? ir_loop_jump::jump_break
3424 : ir_loop_jump::jump_continue
);
3425 instructions
->push_tail(jump
);
3432 /* Jump instructions do not have r-values.
3439 ast_selection_statement::hir(exec_list
*instructions
,
3440 struct _mesa_glsl_parse_state
*state
)
3444 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3446 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3448 * "Any expression whose type evaluates to a Boolean can be used as the
3449 * conditional expression bool-expression. Vector types are not accepted
3450 * as the expression to if."
3452 * The checks are separated so that higher quality diagnostics can be
3453 * generated for cases where both rules are violated.
3455 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3456 YYLTYPE loc
= this->condition
->get_location();
3458 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3462 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3464 if (then_statement
!= NULL
) {
3465 state
->symbols
->push_scope();
3466 then_statement
->hir(& stmt
->then_instructions
, state
);
3467 state
->symbols
->pop_scope();
3470 if (else_statement
!= NULL
) {
3471 state
->symbols
->push_scope();
3472 else_statement
->hir(& stmt
->else_instructions
, state
);
3473 state
->symbols
->pop_scope();
3476 instructions
->push_tail(stmt
);
3478 /* if-statements do not have r-values.
3485 ast_switch_statement::hir(exec_list
*instructions
,
3486 struct _mesa_glsl_parse_state
*state
)
3490 ir_rvalue
*const test_expression
=
3491 this->test_expression
->hir(instructions
, state
);
3493 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3495 * "The type of init-expression in a switch statement must be a
3498 if (!test_expression
->type
->is_scalar() ||
3499 !test_expression
->type
->is_integer()) {
3500 YYLTYPE loc
= this->test_expression
->get_location();
3502 _mesa_glsl_error(& loc
,
3504 "switch-statement expression must be scalar "
3508 /* Track the switch-statement nesting in a stack-like manner.
3510 struct glsl_switch_state saved
= state
->switch_state
;
3512 state
->switch_state
.is_switch_innermost
= true;
3513 state
->switch_state
.switch_nesting_ast
= this;
3514 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3515 hash_table_pointer_compare
);
3516 state
->switch_state
.previous_default
= NULL
;
3518 /* Initalize is_fallthru state to false.
3520 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3521 state
->switch_state
.is_fallthru_var
=
3522 new(ctx
) ir_variable(glsl_type::bool_type
,
3523 "switch_is_fallthru_tmp",
3525 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3527 ir_dereference_variable
*deref_is_fallthru_var
=
3528 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3529 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3532 /* Initalize is_break state to false.
3534 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3535 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3536 "switch_is_break_tmp",
3538 instructions
->push_tail(state
->switch_state
.is_break_var
);
3540 ir_dereference_variable
*deref_is_break_var
=
3541 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3542 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3545 /* Cache test expression.
3547 test_to_hir(instructions
, state
);
3549 /* Emit code for body of switch stmt.
3551 body
->hir(instructions
, state
);
3553 hash_table_dtor(state
->switch_state
.labels_ht
);
3555 state
->switch_state
= saved
;
3557 /* Switch statements do not have r-values. */
3563 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3564 struct _mesa_glsl_parse_state
*state
)
3568 /* Cache value of test expression. */
3569 ir_rvalue
*const test_val
=
3570 test_expression
->hir(instructions
,
3573 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3576 ir_dereference_variable
*deref_test_var
=
3577 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3579 instructions
->push_tail(state
->switch_state
.test_var
);
3580 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
3585 ast_switch_body::hir(exec_list
*instructions
,
3586 struct _mesa_glsl_parse_state
*state
)
3589 stmts
->hir(instructions
, state
);
3591 /* Switch bodies do not have r-values. */
3596 ast_case_statement_list::hir(exec_list
*instructions
,
3597 struct _mesa_glsl_parse_state
*state
)
3599 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3600 case_stmt
->hir(instructions
, state
);
3602 /* Case statements do not have r-values. */
3607 ast_case_statement::hir(exec_list
*instructions
,
3608 struct _mesa_glsl_parse_state
*state
)
3610 labels
->hir(instructions
, state
);
3612 /* Conditionally set fallthru state based on break state. */
3613 ir_constant
*const false_val
= new(state
) ir_constant(false);
3614 ir_dereference_variable
*const deref_is_fallthru_var
=
3615 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3616 ir_dereference_variable
*const deref_is_break_var
=
3617 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3618 ir_assignment
*const reset_fallthru_on_break
=
3619 new(state
) ir_assignment(deref_is_fallthru_var
,
3621 deref_is_break_var
);
3622 instructions
->push_tail(reset_fallthru_on_break
);
3624 /* Guard case statements depending on fallthru state. */
3625 ir_dereference_variable
*const deref_fallthru_guard
=
3626 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3627 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3629 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3630 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3632 instructions
->push_tail(test_fallthru
);
3634 /* Case statements do not have r-values. */
3640 ast_case_label_list::hir(exec_list
*instructions
,
3641 struct _mesa_glsl_parse_state
*state
)
3643 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3644 label
->hir(instructions
, state
);
3646 /* Case labels do not have r-values. */
3651 ast_case_label::hir(exec_list
*instructions
,
3652 struct _mesa_glsl_parse_state
*state
)
3656 ir_dereference_variable
*deref_fallthru_var
=
3657 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3659 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3661 /* If not default case, ... */
3662 if (this->test_value
!= NULL
) {
3663 /* Conditionally set fallthru state based on
3664 * comparison of cached test expression value to case label.
3666 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3667 ir_constant
*label_const
= label_rval
->constant_expression_value();
3670 YYLTYPE loc
= this->test_value
->get_location();
3672 _mesa_glsl_error(& loc
, state
,
3673 "switch statement case label must be a "
3674 "constant expression");
3676 /* Stuff a dummy value in to allow processing to continue. */
3677 label_const
= new(ctx
) ir_constant(0);
3679 ast_expression
*previous_label
= (ast_expression
*)
3680 hash_table_find(state
->switch_state
.labels_ht
,
3681 (void *)(uintptr_t)label_const
->value
.u
[0]);
3683 if (previous_label
) {
3684 YYLTYPE loc
= this->test_value
->get_location();
3685 _mesa_glsl_error(& loc
, state
,
3686 "duplicate case value");
3688 loc
= previous_label
->get_location();
3689 _mesa_glsl_error(& loc
, state
,
3690 "this is the previous case label");
3692 hash_table_insert(state
->switch_state
.labels_ht
,
3694 (void *)(uintptr_t)label_const
->value
.u
[0]);
3698 ir_dereference_variable
*deref_test_var
=
3699 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3701 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3705 ir_assignment
*set_fallthru_on_test
=
3706 new(ctx
) ir_assignment(deref_fallthru_var
,
3710 instructions
->push_tail(set_fallthru_on_test
);
3711 } else { /* default case */
3712 if (state
->switch_state
.previous_default
) {
3713 YYLTYPE loc
= this->get_location();
3714 _mesa_glsl_error(& loc
, state
,
3715 "multiple default labels in one switch");
3717 loc
= state
->switch_state
.previous_default
->get_location();
3718 _mesa_glsl_error(& loc
, state
,
3719 "this is the first default label");
3721 state
->switch_state
.previous_default
= this;
3723 /* Set falltrhu state. */
3724 ir_assignment
*set_fallthru
=
3725 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
3727 instructions
->push_tail(set_fallthru
);
3730 /* Case statements do not have r-values. */
3735 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3736 struct _mesa_glsl_parse_state
*state
)
3740 if (condition
!= NULL
) {
3741 ir_rvalue
*const cond
=
3742 condition
->hir(& stmt
->body_instructions
, state
);
3745 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3746 YYLTYPE loc
= condition
->get_location();
3748 _mesa_glsl_error(& loc
, state
,
3749 "loop condition must be scalar boolean");
3751 /* As the first code in the loop body, generate a block that looks
3752 * like 'if (!condition) break;' as the loop termination condition.
3754 ir_rvalue
*const not_cond
=
3755 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
3757 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3759 ir_jump
*const break_stmt
=
3760 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3762 if_stmt
->then_instructions
.push_tail(break_stmt
);
3763 stmt
->body_instructions
.push_tail(if_stmt
);
3770 ast_iteration_statement::hir(exec_list
*instructions
,
3771 struct _mesa_glsl_parse_state
*state
)
3775 /* For-loops and while-loops start a new scope, but do-while loops do not.
3777 if (mode
!= ast_do_while
)
3778 state
->symbols
->push_scope();
3780 if (init_statement
!= NULL
)
3781 init_statement
->hir(instructions
, state
);
3783 ir_loop
*const stmt
= new(ctx
) ir_loop();
3784 instructions
->push_tail(stmt
);
3786 /* Track the current loop nesting. */
3787 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3789 state
->loop_nesting_ast
= this;
3791 /* Likewise, indicate that following code is closest to a loop,
3792 * NOT closest to a switch.
3794 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3795 state
->switch_state
.is_switch_innermost
= false;
3797 if (mode
!= ast_do_while
)
3798 condition_to_hir(stmt
, state
);
3801 body
->hir(& stmt
->body_instructions
, state
);
3803 if (rest_expression
!= NULL
)
3804 rest_expression
->hir(& stmt
->body_instructions
, state
);
3806 if (mode
== ast_do_while
)
3807 condition_to_hir(stmt
, state
);
3809 if (mode
!= ast_do_while
)
3810 state
->symbols
->pop_scope();
3812 /* Restore previous nesting before returning. */
3813 state
->loop_nesting_ast
= nesting_ast
;
3814 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3816 /* Loops do not have r-values.
3823 * Determine if the given type is valid for establishing a default precision
3826 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
3828 * "The precision statement
3830 * precision precision-qualifier type;
3832 * can be used to establish a default precision qualifier. The type field
3833 * can be either int or float or any of the sampler types, and the
3834 * precision-qualifier can be lowp, mediump, or highp."
3836 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
3837 * qualifiers on sampler types, but this seems like an oversight (since the
3838 * intention of including these in GLSL 1.30 is to allow compatibility with ES
3839 * shaders). So we allow int, float, and all sampler types regardless of GLSL
3843 is_valid_default_precision_type(const struct _mesa_glsl_parse_state
*state
,
3844 const char *type_name
)
3846 const struct glsl_type
*type
= state
->symbols
->get_type(type_name
);
3850 switch (type
->base_type
) {
3852 case GLSL_TYPE_FLOAT
:
3853 /* "int" and "float" are valid, but vectors and matrices are not. */
3854 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
3855 case GLSL_TYPE_SAMPLER
:
3864 ast_type_specifier::hir(exec_list
*instructions
,
3865 struct _mesa_glsl_parse_state
*state
)
3867 if (!this->is_precision_statement
&& this->structure
== NULL
)
3870 YYLTYPE loc
= this->get_location();
3872 if (this->precision
!= ast_precision_none
3873 && !state
->check_precision_qualifiers_allowed(&loc
)) {
3876 if (this->precision
!= ast_precision_none
3877 && this->structure
!= NULL
) {
3878 _mesa_glsl_error(&loc
, state
,
3879 "precision qualifiers do not apply to structures");
3883 /* If this is a precision statement, check that the type to which it is
3884 * applied is either float or int.
3886 * From section 4.5.3 of the GLSL 1.30 spec:
3887 * "The precision statement
3888 * precision precision-qualifier type;
3889 * can be used to establish a default precision qualifier. The type
3890 * field can be either int or float [...]. Any other types or
3891 * qualifiers will result in an error.
3893 if (this->is_precision_statement
) {
3894 assert(this->precision
!= ast_precision_none
);
3895 assert(this->structure
== NULL
); /* The check for structures was
3896 * performed above. */
3897 if (this->is_array
) {
3898 _mesa_glsl_error(&loc
, state
,
3899 "default precision statements do not apply to "
3903 if (!is_valid_default_precision_type(state
, this->type_name
)) {
3904 _mesa_glsl_error(&loc
, state
,
3905 "default precision statements apply only to types "
3906 "float, int, and sampler types");
3910 /* FINISHME: Translate precision statements into IR. */
3914 if (this->structure
!= NULL
)
3915 return this->structure
->hir(instructions
, state
);
3922 * Process a structure or interface block tree into an array of structure fields
3924 * After parsing, where there are some syntax differnces, structures and
3925 * interface blocks are almost identical. They are similar enough that the
3926 * AST for each can be processed the same way into a set of
3927 * \c glsl_struct_field to describe the members.
3930 * The number of fields processed. A pointer to the array structure fields is
3931 * stored in \c *fields_ret.
3934 ast_process_structure_or_interface_block(exec_list
*instructions
,
3935 struct _mesa_glsl_parse_state
*state
,
3936 exec_list
*declarations
,
3938 glsl_struct_field
**fields_ret
,
3940 bool block_row_major
)
3942 unsigned decl_count
= 0;
3944 /* Make an initial pass over the list of fields to determine how
3945 * many there are. Each element in this list is an ast_declarator_list.
3946 * This means that we actually need to count the number of elements in the
3947 * 'declarations' list in each of the elements.
3949 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
3950 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3955 /* Allocate storage for the fields and process the field
3956 * declarations. As the declarations are processed, try to also convert
3957 * the types to HIR. This ensures that structure definitions embedded in
3958 * other structure definitions or in interface blocks are processed.
3960 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3964 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
3965 const char *type_name
;
3967 decl_list
->type
->specifier
->hir(instructions
, state
);
3969 /* Section 10.9 of the GLSL ES 1.00 specification states that
3970 * embedded structure definitions have been removed from the language.
3972 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3973 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3974 "not allowed in GLSL ES 1.00.");
3977 const glsl_type
*decl_type
=
3978 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3980 foreach_list_typed (ast_declaration
, decl
, link
,
3981 &decl_list
->declarations
) {
3982 /* From the GL_ARB_uniform_buffer_object spec:
3984 * "Sampler types are not allowed inside of uniform
3985 * blocks. All other types, arrays, and structures
3986 * allowed for uniforms are allowed within a uniform
3989 * It should be impossible for decl_type to be NULL here. Cases that
3990 * might naturally lead to decl_type being NULL, especially for the
3991 * is_interface case, will have resulted in compilation having
3992 * already halted due to a syntax error.
3994 const struct glsl_type
*field_type
=
3995 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
3997 if (is_interface
&& field_type
->contains_sampler()) {
3998 YYLTYPE loc
= decl_list
->get_location();
3999 _mesa_glsl_error(&loc
, state
,
4000 "Uniform in non-default uniform block contains sampler\n");
4003 const struct ast_type_qualifier
*const qual
=
4004 & decl_list
->type
->qualifier
;
4005 if (qual
->flags
.q
.std140
||
4006 qual
->flags
.q
.packed
||
4007 qual
->flags
.q
.shared
) {
4008 _mesa_glsl_error(&loc
, state
,
4009 "uniform block layout qualifiers std140, packed, and "
4010 "shared can only be applied to uniform blocks, not "
4014 if (decl
->is_array
) {
4015 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4018 fields
[i
].type
= field_type
;
4019 fields
[i
].name
= decl
->identifier
;
4021 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4022 if (!field_type
->is_matrix() && !field_type
->is_record()) {
4023 _mesa_glsl_error(&loc
, state
,
4024 "uniform block layout qualifiers row_major and "
4025 "column_major can only be applied to matrix and "
4028 validate_matrix_layout_for_type(state
, &loc
, field_type
);
4031 if (field_type
->is_matrix() ||
4032 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4033 fields
[i
].row_major
= block_row_major
;
4034 if (qual
->flags
.q
.row_major
)
4035 fields
[i
].row_major
= true;
4036 else if (qual
->flags
.q
.column_major
)
4037 fields
[i
].row_major
= false;
4044 assert(i
== decl_count
);
4046 *fields_ret
= fields
;
4052 ast_struct_specifier::hir(exec_list
*instructions
,
4053 struct _mesa_glsl_parse_state
*state
)
4055 YYLTYPE loc
= this->get_location();
4056 glsl_struct_field
*fields
;
4057 unsigned decl_count
=
4058 ast_process_structure_or_interface_block(instructions
,
4060 &this->declarations
,
4066 const glsl_type
*t
=
4067 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4069 if (!state
->symbols
->add_type(name
, t
)) {
4070 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4072 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4074 state
->num_user_structures
+ 1);
4076 s
[state
->num_user_structures
] = t
;
4077 state
->user_structures
= s
;
4078 state
->num_user_structures
++;
4082 /* Structure type definitions do not have r-values.
4088 ast_uniform_block::hir(exec_list
*instructions
,
4089 struct _mesa_glsl_parse_state
*state
)
4091 YYLTYPE loc
= this->get_location();
4093 /* The ast_uniform_block has a list of ast_declarator_lists. We
4094 * need to turn those into ir_variables with an association
4095 * with this uniform block.
4097 enum glsl_interface_packing packing
;
4098 if (this->layout
.flags
.q
.shared
) {
4099 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4100 } else if (this->layout
.flags
.q
.packed
) {
4101 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4103 /* The default layout is std140.
4105 packing
= GLSL_INTERFACE_PACKING_STD140
;
4108 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4109 exec_list declared_variables
;
4110 glsl_struct_field
*fields
;
4111 unsigned int num_variables
=
4112 ast_process_structure_or_interface_block(&declared_variables
,
4114 &this->declarations
,
4120 const glsl_type
*block_type
=
4121 glsl_type::get_interface_instance(fields
,
4126 if (!state
->symbols
->add_type(block_type
->name
, block_type
)) {
4127 YYLTYPE loc
= this->get_location();
4128 _mesa_glsl_error(&loc
, state
, "Uniform block name `%s' already taken in "
4129 "the current scope.\n", this->block_name
);
4132 /* Since interface blocks cannot contain statements, it should be
4133 * impossible for the block to generate any instructions.
4135 assert(declared_variables
.is_empty());
4137 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4140 * "If an instance name (instance-name) is used, then it puts all the
4141 * members inside a scope within its own name space, accessed with the
4142 * field selector ( . ) operator (analogously to structures)."
4144 if (this->instance_name
) {
4147 if (this->array_size
!= NULL
) {
4148 const glsl_type
*block_array_type
=
4149 process_array_type(&loc
, block_type
, this->array_size
, state
);
4151 var
= new(state
) ir_variable(block_array_type
,
4152 this->instance_name
,
4155 var
= new(state
) ir_variable(block_type
,
4156 this->instance_name
,
4160 var
->interface_type
= block_type
;
4161 state
->symbols
->add_variable(var
);
4162 instructions
->push_tail(var
);
4164 /* In order to have an array size, the block must also be declared with
4167 assert(this->array_size
== NULL
);
4169 for (unsigned i
= 0; i
< num_variables
; i
++) {
4171 new(state
) ir_variable(fields
[i
].type
,
4172 ralloc_strdup(state
, fields
[i
].name
),
4174 var
->interface_type
= block_type
;
4176 state
->symbols
->add_variable(var
);
4177 instructions
->push_tail(var
);
4185 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
4186 exec_list
*instructions
)
4188 bool gl_FragColor_assigned
= false;
4189 bool gl_FragData_assigned
= false;
4190 bool user_defined_fs_output_assigned
= false;
4191 ir_variable
*user_defined_fs_output
= NULL
;
4193 /* It would be nice to have proper location information. */
4195 memset(&loc
, 0, sizeof(loc
));
4197 foreach_list(node
, instructions
) {
4198 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4200 if (!var
|| !var
->assigned
)
4203 if (strcmp(var
->name
, "gl_FragColor") == 0)
4204 gl_FragColor_assigned
= true;
4205 else if (strcmp(var
->name
, "gl_FragData") == 0)
4206 gl_FragData_assigned
= true;
4207 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4208 if (state
->target
== fragment_shader
&&
4209 var
->mode
== ir_var_shader_out
) {
4210 user_defined_fs_output_assigned
= true;
4211 user_defined_fs_output
= var
;
4216 /* From the GLSL 1.30 spec:
4218 * "If a shader statically assigns a value to gl_FragColor, it
4219 * may not assign a value to any element of gl_FragData. If a
4220 * shader statically writes a value to any element of
4221 * gl_FragData, it may not assign a value to
4222 * gl_FragColor. That is, a shader may assign values to either
4223 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4224 * linked together must also consistently write just one of
4225 * these variables. Similarly, if user declared output
4226 * variables are in use (statically assigned to), then the
4227 * built-in variables gl_FragColor and gl_FragData may not be
4228 * assigned to. These incorrect usages all generate compile
4231 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
4232 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4233 "`gl_FragColor' and `gl_FragData'\n");
4234 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
4235 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4236 "`gl_FragColor' and `%s'\n",
4237 user_defined_fs_output
->name
);
4238 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
4239 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4240 "`gl_FragData' and `%s'\n",
4241 user_defined_fs_output
->name
);