2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
57 #include "program/hash_table.h"
61 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
62 exec_list
*instructions
);
65 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
67 _mesa_glsl_initialize_variables(instructions
, state
);
69 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
71 state
->current_function
= NULL
;
73 state
->toplevel_ir
= instructions
;
75 /* Section 4.2 of the GLSL 1.20 specification states:
76 * "The built-in functions are scoped in a scope outside the global scope
77 * users declare global variables in. That is, a shader's global scope,
78 * available for user-defined functions and global variables, is nested
79 * inside the scope containing the built-in functions."
81 * Since built-in functions like ftransform() access built-in variables,
82 * it follows that those must be in the outer scope as well.
84 * We push scope here to create this nesting effect...but don't pop.
85 * This way, a shader's globals are still in the symbol table for use
88 state
->symbols
->push_scope();
90 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
91 ast
->hir(instructions
, state
);
93 detect_recursion_unlinked(state
, instructions
);
94 detect_conflicting_assignments(state
, instructions
);
96 state
->toplevel_ir
= NULL
;
101 * If a conversion is available, convert one operand to a different type
103 * The \c from \c ir_rvalue is converted "in place".
105 * \param to Type that the operand it to be converted to
106 * \param from Operand that is being converted
107 * \param state GLSL compiler state
110 * If a conversion is possible (or unnecessary), \c true is returned.
111 * Otherwise \c false is returned.
114 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
115 struct _mesa_glsl_parse_state
*state
)
118 if (to
->base_type
== from
->type
->base_type
)
121 /* This conversion was added in GLSL 1.20. If the compilation mode is
122 * GLSL 1.10, the conversion is skipped.
124 if (!state
->is_version(120, 0))
127 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
129 * "There are no implicit array or structure conversions. For
130 * example, an array of int cannot be implicitly converted to an
131 * array of float. There are no implicit conversions between
132 * signed and unsigned integers."
134 /* FINISHME: The above comment is partially a lie. There is int/uint
135 * FINISHME: conversion for immediate constants.
137 if (!to
->is_float() || !from
->type
->is_numeric())
140 /* Convert to a floating point type with the same number of components
141 * as the original type - i.e. int to float, not int to vec4.
143 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
144 from
->type
->matrix_columns
);
146 switch (from
->type
->base_type
) {
148 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
151 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
154 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
164 static const struct glsl_type
*
165 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
167 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
169 const glsl_type
*type_a
= value_a
->type
;
170 const glsl_type
*type_b
= value_b
->type
;
172 /* From GLSL 1.50 spec, page 56:
174 * "The arithmetic binary operators add (+), subtract (-),
175 * multiply (*), and divide (/) operate on integer and
176 * floating-point scalars, vectors, and matrices."
178 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
179 _mesa_glsl_error(loc
, state
,
180 "Operands to arithmetic operators must be numeric");
181 return glsl_type::error_type
;
185 /* "If one operand is floating-point based and the other is
186 * not, then the conversions from Section 4.1.10 "Implicit
187 * Conversions" are applied to the non-floating-point-based operand."
189 if (!apply_implicit_conversion(type_a
, value_b
, state
)
190 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
191 _mesa_glsl_error(loc
, state
,
192 "Could not implicitly convert operands to "
193 "arithmetic operator");
194 return glsl_type::error_type
;
196 type_a
= value_a
->type
;
197 type_b
= value_b
->type
;
199 /* "If the operands are integer types, they must both be signed or
202 * From this rule and the preceeding conversion it can be inferred that
203 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
204 * The is_numeric check above already filtered out the case where either
205 * type is not one of these, so now the base types need only be tested for
208 if (type_a
->base_type
!= type_b
->base_type
) {
209 _mesa_glsl_error(loc
, state
,
210 "base type mismatch for arithmetic operator");
211 return glsl_type::error_type
;
214 /* "All arithmetic binary operators result in the same fundamental type
215 * (signed integer, unsigned integer, or floating-point) as the
216 * operands they operate on, after operand type conversion. After
217 * conversion, the following cases are valid
219 * * The two operands are scalars. In this case the operation is
220 * applied, resulting in a scalar."
222 if (type_a
->is_scalar() && type_b
->is_scalar())
225 /* "* One operand is a scalar, and the other is a vector or matrix.
226 * In this case, the scalar operation is applied independently to each
227 * component of the vector or matrix, resulting in the same size
230 if (type_a
->is_scalar()) {
231 if (!type_b
->is_scalar())
233 } else if (type_b
->is_scalar()) {
237 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
238 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
241 assert(!type_a
->is_scalar());
242 assert(!type_b
->is_scalar());
244 /* "* The two operands are vectors of the same size. In this case, the
245 * operation is done component-wise resulting in the same size
248 if (type_a
->is_vector() && type_b
->is_vector()) {
249 if (type_a
== type_b
) {
252 _mesa_glsl_error(loc
, state
,
253 "vector size mismatch for arithmetic operator");
254 return glsl_type::error_type
;
258 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
259 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
260 * <vector, vector> have been handled. At least one of the operands must
261 * be matrix. Further, since there are no integer matrix types, the base
262 * type of both operands must be float.
264 assert(type_a
->is_matrix() || type_b
->is_matrix());
265 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
266 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
268 /* "* The operator is add (+), subtract (-), or divide (/), and the
269 * operands are matrices with the same number of rows and the same
270 * number of columns. In this case, the operation is done component-
271 * wise resulting in the same size matrix."
272 * * The operator is multiply (*), where both operands are matrices or
273 * one operand is a vector and the other a matrix. A right vector
274 * operand is treated as a column vector and a left vector operand as a
275 * row vector. In all these cases, it is required that the number of
276 * columns of the left operand is equal to the number of rows of the
277 * right operand. Then, the multiply (*) operation does a linear
278 * algebraic multiply, yielding an object that has the same number of
279 * rows as the left operand and the same number of columns as the right
280 * operand. Section 5.10 "Vector and Matrix Operations" explains in
281 * more detail how vectors and matrices are operated on."
284 if (type_a
== type_b
)
287 if (type_a
->is_matrix() && type_b
->is_matrix()) {
288 /* Matrix multiply. The columns of A must match the rows of B. Given
289 * the other previously tested constraints, this means the vector type
290 * of a row from A must be the same as the vector type of a column from
293 if (type_a
->row_type() == type_b
->column_type()) {
294 /* The resulting matrix has the number of columns of matrix B and
295 * the number of rows of matrix A. We get the row count of A by
296 * looking at the size of a vector that makes up a column. The
297 * transpose (size of a row) is done for B.
299 const glsl_type
*const type
=
300 glsl_type::get_instance(type_a
->base_type
,
301 type_a
->column_type()->vector_elements
,
302 type_b
->row_type()->vector_elements
);
303 assert(type
!= glsl_type::error_type
);
307 } else if (type_a
->is_matrix()) {
308 /* A is a matrix and B is a column vector. Columns of A must match
309 * rows of B. Given the other previously tested constraints, this
310 * means the vector type of a row from A must be the same as the
311 * vector the type of B.
313 if (type_a
->row_type() == type_b
) {
314 /* The resulting vector has a number of elements equal to
315 * the number of rows of matrix A. */
316 const glsl_type
*const type
=
317 glsl_type::get_instance(type_a
->base_type
,
318 type_a
->column_type()->vector_elements
,
320 assert(type
!= glsl_type::error_type
);
325 assert(type_b
->is_matrix());
327 /* A is a row vector and B is a matrix. Columns of A must match rows
328 * of B. Given the other previously tested constraints, this means
329 * the type of A must be the same as the vector type of a column from
332 if (type_a
== type_b
->column_type()) {
333 /* The resulting vector has a number of elements equal to
334 * the number of columns of matrix B. */
335 const glsl_type
*const type
=
336 glsl_type::get_instance(type_a
->base_type
,
337 type_b
->row_type()->vector_elements
,
339 assert(type
!= glsl_type::error_type
);
345 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
346 return glsl_type::error_type
;
350 /* "All other cases are illegal."
352 _mesa_glsl_error(loc
, state
, "type mismatch");
353 return glsl_type::error_type
;
357 static const struct glsl_type
*
358 unary_arithmetic_result_type(const struct glsl_type
*type
,
359 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
361 /* From GLSL 1.50 spec, page 57:
363 * "The arithmetic unary operators negate (-), post- and pre-increment
364 * and decrement (-- and ++) operate on integer or floating-point
365 * values (including vectors and matrices). All unary operators work
366 * component-wise on their operands. These result with the same type
369 if (!type
->is_numeric()) {
370 _mesa_glsl_error(loc
, state
,
371 "Operands to arithmetic operators must be numeric");
372 return glsl_type::error_type
;
379 * \brief Return the result type of a bit-logic operation.
381 * If the given types to the bit-logic operator are invalid, return
382 * glsl_type::error_type.
384 * \param type_a Type of LHS of bit-logic op
385 * \param type_b Type of RHS of bit-logic op
387 static const struct glsl_type
*
388 bit_logic_result_type(const struct glsl_type
*type_a
,
389 const struct glsl_type
*type_b
,
391 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
393 if (!state
->check_bitwise_operations_allowed(loc
)) {
394 return glsl_type::error_type
;
397 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
399 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
400 * (|). The operands must be of type signed or unsigned integers or
403 if (!type_a
->is_integer()) {
404 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
405 ast_expression::operator_string(op
));
406 return glsl_type::error_type
;
408 if (!type_b
->is_integer()) {
409 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
410 ast_expression::operator_string(op
));
411 return glsl_type::error_type
;
414 /* "The fundamental types of the operands (signed or unsigned) must
417 if (type_a
->base_type
!= type_b
->base_type
) {
418 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
419 "base type", ast_expression::operator_string(op
));
420 return glsl_type::error_type
;
423 /* "The operands cannot be vectors of differing size." */
424 if (type_a
->is_vector() &&
425 type_b
->is_vector() &&
426 type_a
->vector_elements
!= type_b
->vector_elements
) {
427 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
428 "different sizes", ast_expression::operator_string(op
));
429 return glsl_type::error_type
;
432 /* "If one operand is a scalar and the other a vector, the scalar is
433 * applied component-wise to the vector, resulting in the same type as
434 * the vector. The fundamental types of the operands [...] will be the
435 * resulting fundamental type."
437 if (type_a
->is_scalar())
443 static const struct glsl_type
*
444 modulus_result_type(const struct glsl_type
*type_a
,
445 const struct glsl_type
*type_b
,
446 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
448 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
449 return glsl_type::error_type
;
452 /* From GLSL 1.50 spec, page 56:
453 * "The operator modulus (%) operates on signed or unsigned integers or
454 * integer vectors. The operand types must both be signed or both be
457 if (!type_a
->is_integer()) {
458 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
459 return glsl_type::error_type
;
461 if (!type_b
->is_integer()) {
462 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
463 return glsl_type::error_type
;
465 if (type_a
->base_type
!= type_b
->base_type
) {
466 _mesa_glsl_error(loc
, state
,
467 "operands of %% must have the same base type");
468 return glsl_type::error_type
;
471 /* "The operands cannot be vectors of differing size. If one operand is
472 * a scalar and the other vector, then the scalar is applied component-
473 * wise to the vector, resulting in the same type as the vector. If both
474 * are vectors of the same size, the result is computed component-wise."
476 if (type_a
->is_vector()) {
477 if (!type_b
->is_vector()
478 || (type_a
->vector_elements
== type_b
->vector_elements
))
483 /* "The operator modulus (%) is not defined for any other data types
484 * (non-integer types)."
486 _mesa_glsl_error(loc
, state
, "type mismatch");
487 return glsl_type::error_type
;
491 static const struct glsl_type
*
492 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
493 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
495 const glsl_type
*type_a
= value_a
->type
;
496 const glsl_type
*type_b
= value_b
->type
;
498 /* From GLSL 1.50 spec, page 56:
499 * "The relational operators greater than (>), less than (<), greater
500 * than or equal (>=), and less than or equal (<=) operate only on
501 * scalar integer and scalar floating-point expressions."
503 if (!type_a
->is_numeric()
504 || !type_b
->is_numeric()
505 || !type_a
->is_scalar()
506 || !type_b
->is_scalar()) {
507 _mesa_glsl_error(loc
, state
,
508 "Operands to relational operators must be scalar and "
510 return glsl_type::error_type
;
513 /* "Either the operands' types must match, or the conversions from
514 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
515 * operand, after which the types must match."
517 if (!apply_implicit_conversion(type_a
, value_b
, state
)
518 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
519 _mesa_glsl_error(loc
, state
,
520 "Could not implicitly convert operands to "
521 "relational operator");
522 return glsl_type::error_type
;
524 type_a
= value_a
->type
;
525 type_b
= value_b
->type
;
527 if (type_a
->base_type
!= type_b
->base_type
) {
528 _mesa_glsl_error(loc
, state
, "base type mismatch");
529 return glsl_type::error_type
;
532 /* "The result is scalar Boolean."
534 return glsl_type::bool_type
;
538 * \brief Return the result type of a bit-shift operation.
540 * If the given types to the bit-shift operator are invalid, return
541 * glsl_type::error_type.
543 * \param type_a Type of LHS of bit-shift op
544 * \param type_b Type of RHS of bit-shift op
546 static const struct glsl_type
*
547 shift_result_type(const struct glsl_type
*type_a
,
548 const struct glsl_type
*type_b
,
550 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
552 if (!state
->check_bitwise_operations_allowed(loc
)) {
553 return glsl_type::error_type
;
556 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
558 * "The shift operators (<<) and (>>). For both operators, the operands
559 * must be signed or unsigned integers or integer vectors. One operand
560 * can be signed while the other is unsigned."
562 if (!type_a
->is_integer()) {
563 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
564 "integer vector", ast_expression::operator_string(op
));
565 return glsl_type::error_type
;
568 if (!type_b
->is_integer()) {
569 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
570 "integer vector", ast_expression::operator_string(op
));
571 return glsl_type::error_type
;
574 /* "If the first operand is a scalar, the second operand has to be
577 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
578 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
579 "second must be scalar as well",
580 ast_expression::operator_string(op
));
581 return glsl_type::error_type
;
584 /* If both operands are vectors, check that they have same number of
587 if (type_a
->is_vector() &&
588 type_b
->is_vector() &&
589 type_a
->vector_elements
!= type_b
->vector_elements
) {
590 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
591 "have same number of elements",
592 ast_expression::operator_string(op
));
593 return glsl_type::error_type
;
596 /* "In all cases, the resulting type will be the same type as the left
603 * Validates that a value can be assigned to a location with a specified type
605 * Validates that \c rhs can be assigned to some location. If the types are
606 * not an exact match but an automatic conversion is possible, \c rhs will be
610 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
611 * Otherwise the actual RHS to be assigned will be returned. This may be
612 * \c rhs, or it may be \c rhs after some type conversion.
615 * In addition to being used for assignments, this function is used to
616 * type-check return values.
619 validate_assignment(struct _mesa_glsl_parse_state
*state
,
620 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
623 /* If there is already some error in the RHS, just return it. Anything
624 * else will lead to an avalanche of error message back to the user.
626 if (rhs
->type
->is_error())
629 /* If the types are identical, the assignment can trivially proceed.
631 if (rhs
->type
== lhs_type
)
634 /* If the array element types are the same and the size of the LHS is zero,
635 * the assignment is okay for initializers embedded in variable
638 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
639 * is handled by ir_dereference::is_lvalue.
641 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
642 && (lhs_type
->element_type() == rhs
->type
->element_type())
643 && (lhs_type
->array_size() == 0)) {
647 /* Check for implicit conversion in GLSL 1.20 */
648 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
649 if (rhs
->type
== lhs_type
)
657 mark_whole_array_access(ir_rvalue
*access
)
659 ir_dereference_variable
*deref
= access
->as_dereference_variable();
661 if (deref
&& deref
->var
) {
662 deref
->var
->max_array_access
= deref
->type
->length
- 1;
667 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
668 const char *non_lvalue_description
,
669 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
673 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
675 ir_variable
*lhs_var
= lhs
->variable_referenced();
677 lhs_var
->assigned
= true;
679 if (!error_emitted
) {
680 if (non_lvalue_description
!= NULL
) {
681 _mesa_glsl_error(&lhs_loc
, state
,
683 non_lvalue_description
);
684 error_emitted
= true;
685 } else if (lhs
->variable_referenced() != NULL
686 && lhs
->variable_referenced()->read_only
) {
687 _mesa_glsl_error(&lhs_loc
, state
,
688 "assignment to read-only variable '%s'",
689 lhs
->variable_referenced()->name
);
690 error_emitted
= true;
692 } else if (lhs
->type
->is_array() &&
693 !state
->check_version(120, 300, &lhs_loc
,
694 "whole array assignment forbidden")) {
695 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
697 * "Other binary or unary expressions, non-dereferenced
698 * arrays, function names, swizzles with repeated fields,
699 * and constants cannot be l-values."
701 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
703 error_emitted
= true;
704 } else if (!lhs
->is_lvalue()) {
705 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
706 error_emitted
= true;
711 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
712 if (new_rhs
== NULL
) {
713 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
717 /* If the LHS array was not declared with a size, it takes it size from
718 * the RHS. If the LHS is an l-value and a whole array, it must be a
719 * dereference of a variable. Any other case would require that the LHS
720 * is either not an l-value or not a whole array.
722 if (lhs
->type
->array_size() == 0) {
723 ir_dereference
*const d
= lhs
->as_dereference();
727 ir_variable
*const var
= d
->variable_referenced();
731 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
732 /* FINISHME: This should actually log the location of the RHS. */
733 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
735 var
->max_array_access
);
738 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
739 rhs
->type
->array_size());
742 mark_whole_array_access(rhs
);
743 mark_whole_array_access(lhs
);
746 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
747 * but not post_inc) need the converted assigned value as an rvalue
748 * to handle things like:
752 * So we always just store the computed value being assigned to a
753 * temporary and return a deref of that temporary. If the rvalue
754 * ends up not being used, the temp will get copy-propagated out.
756 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
758 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
759 instructions
->push_tail(var
);
760 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
761 deref_var
= new(ctx
) ir_dereference_variable(var
);
764 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
766 return new(ctx
) ir_dereference_variable(var
);
770 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
772 void *ctx
= ralloc_parent(lvalue
);
775 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
777 instructions
->push_tail(var
);
778 var
->mode
= ir_var_auto
;
780 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
783 return new(ctx
) ir_dereference_variable(var
);
788 ast_node::hir(exec_list
*instructions
,
789 struct _mesa_glsl_parse_state
*state
)
798 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
801 ir_rvalue
*cmp
= NULL
;
803 if (operation
== ir_binop_all_equal
)
804 join_op
= ir_binop_logic_and
;
806 join_op
= ir_binop_logic_or
;
808 switch (op0
->type
->base_type
) {
809 case GLSL_TYPE_FLOAT
:
813 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
815 case GLSL_TYPE_ARRAY
: {
816 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
817 ir_rvalue
*e0
, *e1
, *result
;
819 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
820 new(mem_ctx
) ir_constant(i
));
821 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
822 new(mem_ctx
) ir_constant(i
));
823 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
826 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
832 mark_whole_array_access(op0
);
833 mark_whole_array_access(op1
);
837 case GLSL_TYPE_STRUCT
: {
838 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
839 ir_rvalue
*e0
, *e1
, *result
;
840 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
842 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
844 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
846 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
849 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
857 case GLSL_TYPE_ERROR
:
859 case GLSL_TYPE_SAMPLER
:
860 case GLSL_TYPE_INTERFACE
:
861 /* I assume a comparison of a struct containing a sampler just
862 * ignores the sampler present in the type.
868 cmp
= new(mem_ctx
) ir_constant(true);
873 /* For logical operations, we want to ensure that the operands are
874 * scalar booleans. If it isn't, emit an error and return a constant
875 * boolean to avoid triggering cascading error messages.
878 get_scalar_boolean_operand(exec_list
*instructions
,
879 struct _mesa_glsl_parse_state
*state
,
880 ast_expression
*parent_expr
,
882 const char *operand_name
,
885 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
887 ir_rvalue
*val
= expr
->hir(instructions
, state
);
889 if (val
->type
->is_boolean() && val
->type
->is_scalar())
892 if (!*error_emitted
) {
893 YYLTYPE loc
= expr
->get_location();
894 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
896 parent_expr
->operator_string(parent_expr
->oper
));
897 *error_emitted
= true;
900 return new(ctx
) ir_constant(true);
904 * If name refers to a builtin array whose maximum allowed size is less than
905 * size, report an error and return true. Otherwise return false.
908 check_builtin_array_max_size(const char *name
, unsigned size
,
909 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
911 if ((strcmp("gl_TexCoord", name
) == 0)
912 && (size
> state
->Const
.MaxTextureCoords
)) {
913 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
915 * "The size [of gl_TexCoord] can be at most
916 * gl_MaxTextureCoords."
918 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
919 "be larger than gl_MaxTextureCoords (%u)\n",
920 state
->Const
.MaxTextureCoords
);
922 } else if (strcmp("gl_ClipDistance", name
) == 0
923 && size
> state
->Const
.MaxClipPlanes
) {
924 /* From section 7.1 (Vertex Shader Special Variables) of the
927 * "The gl_ClipDistance array is predeclared as unsized and
928 * must be sized by the shader either redeclaring it with a
929 * size or indexing it only with integral constant
930 * expressions. ... The size can be at most
931 * gl_MaxClipDistances."
933 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
934 "be larger than gl_MaxClipDistances (%u)\n",
935 state
->Const
.MaxClipPlanes
);
942 * Create the constant 1, of a which is appropriate for incrementing and
943 * decrementing values of the given GLSL type. For example, if type is vec4,
944 * this creates a constant value of 1.0 having type float.
946 * If the given type is invalid for increment and decrement operators, return
947 * a floating point 1--the error will be detected later.
950 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
952 switch (type
->base_type
) {
954 return new(ctx
) ir_constant((unsigned) 1);
956 return new(ctx
) ir_constant(1);
958 case GLSL_TYPE_FLOAT
:
959 return new(ctx
) ir_constant(1.0f
);
964 ast_expression::hir(exec_list
*instructions
,
965 struct _mesa_glsl_parse_state
*state
)
968 static const int operations
[AST_NUM_OPERATORS
] = {
969 -1, /* ast_assign doesn't convert to ir_expression. */
970 -1, /* ast_plus doesn't convert to ir_expression. */
994 /* Note: The following block of expression types actually convert
995 * to multiple IR instructions.
997 ir_binop_mul
, /* ast_mul_assign */
998 ir_binop_div
, /* ast_div_assign */
999 ir_binop_mod
, /* ast_mod_assign */
1000 ir_binop_add
, /* ast_add_assign */
1001 ir_binop_sub
, /* ast_sub_assign */
1002 ir_binop_lshift
, /* ast_ls_assign */
1003 ir_binop_rshift
, /* ast_rs_assign */
1004 ir_binop_bit_and
, /* ast_and_assign */
1005 ir_binop_bit_xor
, /* ast_xor_assign */
1006 ir_binop_bit_or
, /* ast_or_assign */
1008 -1, /* ast_conditional doesn't convert to ir_expression. */
1009 ir_binop_add
, /* ast_pre_inc. */
1010 ir_binop_sub
, /* ast_pre_dec. */
1011 ir_binop_add
, /* ast_post_inc. */
1012 ir_binop_sub
, /* ast_post_dec. */
1013 -1, /* ast_field_selection doesn't conv to ir_expression. */
1014 -1, /* ast_array_index doesn't convert to ir_expression. */
1015 -1, /* ast_function_call doesn't conv to ir_expression. */
1016 -1, /* ast_identifier doesn't convert to ir_expression. */
1017 -1, /* ast_int_constant doesn't convert to ir_expression. */
1018 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1019 -1, /* ast_float_constant doesn't conv to ir_expression. */
1020 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1021 -1, /* ast_sequence doesn't convert to ir_expression. */
1023 ir_rvalue
*result
= NULL
;
1025 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1026 bool error_emitted
= false;
1029 loc
= this->get_location();
1031 switch (this->oper
) {
1033 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1034 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1036 result
= do_assignment(instructions
, state
,
1037 this->subexpressions
[0]->non_lvalue_description
,
1038 op
[0], op
[1], false,
1039 this->subexpressions
[0]->get_location());
1040 error_emitted
= result
->type
->is_error();
1045 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1047 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1049 error_emitted
= type
->is_error();
1055 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1057 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1059 error_emitted
= type
->is_error();
1061 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1069 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1070 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1072 type
= arithmetic_result_type(op
[0], op
[1],
1073 (this->oper
== ast_mul
),
1075 error_emitted
= type
->is_error();
1077 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1082 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1083 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1085 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1087 assert(operations
[this->oper
] == ir_binop_mod
);
1089 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1091 error_emitted
= type
->is_error();
1096 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1097 error_emitted
= true;
1100 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1101 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1102 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1104 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1106 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1113 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1114 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1116 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1118 /* The relational operators must either generate an error or result
1119 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1121 assert(type
->is_error()
1122 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1123 && type
->is_scalar()));
1125 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1127 error_emitted
= type
->is_error();
1132 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1133 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1135 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1137 * "The equality operators equal (==), and not equal (!=)
1138 * operate on all types. They result in a scalar Boolean. If
1139 * the operand types do not match, then there must be a
1140 * conversion from Section 4.1.10 "Implicit Conversions"
1141 * applied to one operand that can make them match, in which
1142 * case this conversion is done."
1144 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1145 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1146 || (op
[0]->type
!= op
[1]->type
)) {
1147 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1148 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1149 error_emitted
= true;
1150 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1151 !state
->check_version(120, 300, &loc
,
1152 "array comparisons forbidden")) {
1153 error_emitted
= true;
1156 if (error_emitted
) {
1157 result
= new(ctx
) ir_constant(false);
1159 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1160 assert(result
->type
== glsl_type::bool_type
);
1167 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1168 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1169 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1171 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1173 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1177 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1179 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1180 error_emitted
= true;
1183 if (!op
[0]->type
->is_integer()) {
1184 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1185 error_emitted
= true;
1188 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1189 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1192 case ast_logic_and
: {
1193 exec_list rhs_instructions
;
1194 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1195 "LHS", &error_emitted
);
1196 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1197 "RHS", &error_emitted
);
1199 if (rhs_instructions
.is_empty()) {
1200 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1201 type
= result
->type
;
1203 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1206 instructions
->push_tail(tmp
);
1208 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1209 instructions
->push_tail(stmt
);
1211 stmt
->then_instructions
.append_list(&rhs_instructions
);
1212 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1213 ir_assignment
*const then_assign
=
1214 new(ctx
) ir_assignment(then_deref
, op
[1]);
1215 stmt
->then_instructions
.push_tail(then_assign
);
1217 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1218 ir_assignment
*const else_assign
=
1219 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1220 stmt
->else_instructions
.push_tail(else_assign
);
1222 result
= new(ctx
) ir_dereference_variable(tmp
);
1228 case ast_logic_or
: {
1229 exec_list rhs_instructions
;
1230 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1231 "LHS", &error_emitted
);
1232 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1233 "RHS", &error_emitted
);
1235 if (rhs_instructions
.is_empty()) {
1236 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1237 type
= result
->type
;
1239 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1242 instructions
->push_tail(tmp
);
1244 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1245 instructions
->push_tail(stmt
);
1247 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1248 ir_assignment
*const then_assign
=
1249 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1250 stmt
->then_instructions
.push_tail(then_assign
);
1252 stmt
->else_instructions
.append_list(&rhs_instructions
);
1253 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1254 ir_assignment
*const else_assign
=
1255 new(ctx
) ir_assignment(else_deref
, op
[1]);
1256 stmt
->else_instructions
.push_tail(else_assign
);
1258 result
= new(ctx
) ir_dereference_variable(tmp
);
1265 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1267 * "The logical binary operators and (&&), or ( | | ), and
1268 * exclusive or (^^). They operate only on two Boolean
1269 * expressions and result in a Boolean expression."
1271 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1273 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1276 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1281 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1282 "operand", &error_emitted
);
1284 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1288 case ast_mul_assign
:
1289 case ast_div_assign
:
1290 case ast_add_assign
:
1291 case ast_sub_assign
: {
1292 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1293 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1295 type
= arithmetic_result_type(op
[0], op
[1],
1296 (this->oper
== ast_mul_assign
),
1299 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1302 result
= do_assignment(instructions
, state
,
1303 this->subexpressions
[0]->non_lvalue_description
,
1304 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1305 this->subexpressions
[0]->get_location());
1306 error_emitted
= (op
[0]->type
->is_error());
1308 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1309 * explicitly test for this because none of the binary expression
1310 * operators allow array operands either.
1316 case ast_mod_assign
: {
1317 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1318 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1320 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1322 assert(operations
[this->oper
] == ir_binop_mod
);
1324 ir_rvalue
*temp_rhs
;
1325 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1328 result
= do_assignment(instructions
, state
,
1329 this->subexpressions
[0]->non_lvalue_description
,
1330 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1331 this->subexpressions
[0]->get_location());
1332 error_emitted
= type
->is_error();
1337 case ast_rs_assign
: {
1338 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1339 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1340 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1342 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1343 type
, op
[0], op
[1]);
1344 result
= do_assignment(instructions
, state
,
1345 this->subexpressions
[0]->non_lvalue_description
,
1346 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1347 this->subexpressions
[0]->get_location());
1348 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1352 case ast_and_assign
:
1353 case ast_xor_assign
:
1354 case ast_or_assign
: {
1355 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1356 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1357 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1359 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1360 type
, op
[0], op
[1]);
1361 result
= do_assignment(instructions
, state
,
1362 this->subexpressions
[0]->non_lvalue_description
,
1363 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1364 this->subexpressions
[0]->get_location());
1365 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1369 case ast_conditional
: {
1370 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1372 * "The ternary selection operator (?:). It operates on three
1373 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1374 * first expression, which must result in a scalar Boolean."
1376 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1377 "condition", &error_emitted
);
1379 /* The :? operator is implemented by generating an anonymous temporary
1380 * followed by an if-statement. The last instruction in each branch of
1381 * the if-statement assigns a value to the anonymous temporary. This
1382 * temporary is the r-value of the expression.
1384 exec_list then_instructions
;
1385 exec_list else_instructions
;
1387 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1388 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1390 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1392 * "The second and third expressions can be any type, as
1393 * long their types match, or there is a conversion in
1394 * Section 4.1.10 "Implicit Conversions" that can be applied
1395 * to one of the expressions to make their types match. This
1396 * resulting matching type is the type of the entire
1399 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1400 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1401 || (op
[1]->type
!= op
[2]->type
)) {
1402 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1404 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1405 "operator must have matching types.");
1406 error_emitted
= true;
1407 type
= glsl_type::error_type
;
1412 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1414 * "The second and third expressions must be the same type, but can
1415 * be of any type other than an array."
1417 if (type
->is_array() &&
1418 !state
->check_version(120, 300, &loc
,
1419 "Second and third operands of ?: operator "
1420 "cannot be arrays")) {
1421 error_emitted
= true;
1424 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1425 ir_constant
*then_val
= op
[1]->constant_expression_value();
1426 ir_constant
*else_val
= op
[2]->constant_expression_value();
1428 if (then_instructions
.is_empty()
1429 && else_instructions
.is_empty()
1430 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1431 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1433 ir_variable
*const tmp
=
1434 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1435 instructions
->push_tail(tmp
);
1437 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1438 instructions
->push_tail(stmt
);
1440 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1441 ir_dereference
*const then_deref
=
1442 new(ctx
) ir_dereference_variable(tmp
);
1443 ir_assignment
*const then_assign
=
1444 new(ctx
) ir_assignment(then_deref
, op
[1]);
1445 stmt
->then_instructions
.push_tail(then_assign
);
1447 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1448 ir_dereference
*const else_deref
=
1449 new(ctx
) ir_dereference_variable(tmp
);
1450 ir_assignment
*const else_assign
=
1451 new(ctx
) ir_assignment(else_deref
, op
[2]);
1452 stmt
->else_instructions
.push_tail(else_assign
);
1454 result
= new(ctx
) ir_dereference_variable(tmp
);
1461 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1462 ? "pre-increment operation" : "pre-decrement operation";
1464 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1465 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1467 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1469 ir_rvalue
*temp_rhs
;
1470 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1473 result
= do_assignment(instructions
, state
,
1474 this->subexpressions
[0]->non_lvalue_description
,
1475 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1476 this->subexpressions
[0]->get_location());
1477 error_emitted
= op
[0]->type
->is_error();
1482 case ast_post_dec
: {
1483 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1484 ? "post-increment operation" : "post-decrement operation";
1485 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1486 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1488 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1490 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1492 ir_rvalue
*temp_rhs
;
1493 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1496 /* Get a temporary of a copy of the lvalue before it's modified.
1497 * This may get thrown away later.
1499 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1501 (void)do_assignment(instructions
, state
,
1502 this->subexpressions
[0]->non_lvalue_description
,
1503 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1504 this->subexpressions
[0]->get_location());
1506 error_emitted
= op
[0]->type
->is_error();
1510 case ast_field_selection
:
1511 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1514 case ast_array_index
: {
1515 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1517 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1518 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1520 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1522 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1523 loc
, index_loc
, error_emitted
);
1525 if (result
->type
->is_error())
1526 error_emitted
= true;
1531 case ast_function_call
:
1532 /* Should *NEVER* get here. ast_function_call should always be handled
1533 * by ast_function_expression::hir.
1538 case ast_identifier
: {
1539 /* ast_identifier can appear several places in a full abstract syntax
1540 * tree. This particular use must be at location specified in the grammar
1541 * as 'variable_identifier'.
1544 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1548 result
= new(ctx
) ir_dereference_variable(var
);
1550 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1551 this->primary_expression
.identifier
);
1553 result
= ir_rvalue::error_value(ctx
);
1554 error_emitted
= true;
1559 case ast_int_constant
:
1560 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1563 case ast_uint_constant
:
1564 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1567 case ast_float_constant
:
1568 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1571 case ast_bool_constant
:
1572 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1575 case ast_sequence
: {
1576 /* It should not be possible to generate a sequence in the AST without
1577 * any expressions in it.
1579 assert(!this->expressions
.is_empty());
1581 /* The r-value of a sequence is the last expression in the sequence. If
1582 * the other expressions in the sequence do not have side-effects (and
1583 * therefore add instructions to the instruction list), they get dropped
1586 exec_node
*previous_tail_pred
= NULL
;
1587 YYLTYPE previous_operand_loc
= loc
;
1589 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1590 /* If one of the operands of comma operator does not generate any
1591 * code, we want to emit a warning. At each pass through the loop
1592 * previous_tail_pred will point to the last instruction in the
1593 * stream *before* processing the previous operand. Naturally,
1594 * instructions->tail_pred will point to the last instruction in the
1595 * stream *after* processing the previous operand. If the two
1596 * pointers match, then the previous operand had no effect.
1598 * The warning behavior here differs slightly from GCC. GCC will
1599 * only emit a warning if none of the left-hand operands have an
1600 * effect. However, it will emit a warning for each. I believe that
1601 * there are some cases in C (especially with GCC extensions) where
1602 * it is useful to have an intermediate step in a sequence have no
1603 * effect, but I don't think these cases exist in GLSL. Either way,
1604 * it would be a giant hassle to replicate that behavior.
1606 if (previous_tail_pred
== instructions
->tail_pred
) {
1607 _mesa_glsl_warning(&previous_operand_loc
, state
,
1608 "left-hand operand of comma expression has "
1612 /* tail_pred is directly accessed instead of using the get_tail()
1613 * method for performance reasons. get_tail() has extra code to
1614 * return NULL when the list is empty. We don't care about that
1615 * here, so using tail_pred directly is fine.
1617 previous_tail_pred
= instructions
->tail_pred
;
1618 previous_operand_loc
= ast
->get_location();
1620 result
= ast
->hir(instructions
, state
);
1623 /* Any errors should have already been emitted in the loop above.
1625 error_emitted
= true;
1629 type
= NULL
; /* use result->type, not type. */
1630 assert(result
!= NULL
);
1632 if (result
->type
->is_error() && !error_emitted
)
1633 _mesa_glsl_error(& loc
, state
, "type mismatch");
1640 ast_expression_statement::hir(exec_list
*instructions
,
1641 struct _mesa_glsl_parse_state
*state
)
1643 /* It is possible to have expression statements that don't have an
1644 * expression. This is the solitary semicolon:
1646 * for (i = 0; i < 5; i++)
1649 * In this case the expression will be NULL. Test for NULL and don't do
1650 * anything in that case.
1652 if (expression
!= NULL
)
1653 expression
->hir(instructions
, state
);
1655 /* Statements do not have r-values.
1662 ast_compound_statement::hir(exec_list
*instructions
,
1663 struct _mesa_glsl_parse_state
*state
)
1666 state
->symbols
->push_scope();
1668 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1669 ast
->hir(instructions
, state
);
1672 state
->symbols
->pop_scope();
1674 /* Compound statements do not have r-values.
1680 static const glsl_type
*
1681 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1682 struct _mesa_glsl_parse_state
*state
)
1684 unsigned length
= 0;
1686 /* From page 19 (page 25) of the GLSL 1.20 spec:
1688 * "Only one-dimensional arrays may be declared."
1690 if (base
->is_array()) {
1691 _mesa_glsl_error(loc
, state
,
1692 "invalid array of `%s' (only one-dimensional arrays "
1695 return glsl_type::error_type
;
1698 if (array_size
!= NULL
) {
1699 exec_list dummy_instructions
;
1700 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1701 YYLTYPE loc
= array_size
->get_location();
1704 if (!ir
->type
->is_integer()) {
1705 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1706 } else if (!ir
->type
->is_scalar()) {
1707 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1709 ir_constant
*const size
= ir
->constant_expression_value();
1712 _mesa_glsl_error(& loc
, state
, "array size must be a "
1713 "constant valued expression");
1714 } else if (size
->value
.i
[0] <= 0) {
1715 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1717 assert(size
->type
== ir
->type
);
1718 length
= size
->value
.u
[0];
1720 /* If the array size is const (and we've verified that
1721 * it is) then no instructions should have been emitted
1722 * when we converted it to HIR. If they were emitted,
1723 * then either the array size isn't const after all, or
1724 * we are emitting unnecessary instructions.
1726 assert(dummy_instructions
.is_empty());
1730 } else if (state
->es_shader
) {
1731 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1732 * array declarations have been removed from the language.
1734 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1735 "allowed in GLSL ES 1.00.");
1738 return glsl_type::get_array_instance(base
, length
);
1743 ast_type_specifier::glsl_type(const char **name
,
1744 struct _mesa_glsl_parse_state
*state
) const
1746 const struct glsl_type
*type
;
1748 type
= state
->symbols
->get_type(this->type_name
);
1749 *name
= this->type_name
;
1751 if (this->is_array
) {
1752 YYLTYPE loc
= this->get_location();
1753 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1761 * Determine whether a toplevel variable declaration declares a varying. This
1762 * function operates by examining the variable's mode and the shader target,
1763 * so it correctly identifies linkage variables regardless of whether they are
1764 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1766 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1767 * this function will produce undefined results.
1770 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1774 return var
->mode
== ir_var_shader_out
;
1775 case fragment_shader
:
1776 return var
->mode
== ir_var_shader_in
;
1778 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1784 * Matrix layout qualifiers are only allowed on certain types
1787 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1789 const glsl_type
*type
)
1791 if (!type
->is_matrix() && !type
->is_record()) {
1792 _mesa_glsl_error(loc
, state
,
1793 "uniform block layout qualifiers row_major and "
1794 "column_major can only be applied to matrix and "
1796 } else if (type
->is_record()) {
1797 /* We allow 'layout(row_major)' on structure types because it's the only
1798 * way to get row-major layouts on matrices contained in structures.
1800 _mesa_glsl_warning(loc
, state
,
1801 "uniform block layout qualifiers row_major and "
1802 "column_major applied to structure types is not "
1803 "strictly conformant and my be rejected by other "
1809 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1811 struct _mesa_glsl_parse_state
*state
,
1813 bool ubo_qualifiers_valid
,
1816 if (qual
->flags
.q
.invariant
) {
1818 _mesa_glsl_error(loc
, state
,
1819 "variable `%s' may not be redeclared "
1820 "`invariant' after being used",
1827 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1828 || qual
->flags
.q
.uniform
1829 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1832 if (qual
->flags
.q
.centroid
)
1835 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1836 var
->type
= glsl_type::error_type
;
1837 _mesa_glsl_error(loc
, state
,
1838 "`attribute' variables may not be declared in the "
1840 _mesa_glsl_shader_target_name(state
->target
));
1843 /* If there is no qualifier that changes the mode of the variable, leave
1844 * the setting alone.
1846 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1847 var
->mode
= ir_var_function_inout
;
1848 else if (qual
->flags
.q
.in
)
1849 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
1850 else if (qual
->flags
.q
.attribute
1851 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1852 var
->mode
= ir_var_shader_in
;
1853 else if (qual
->flags
.q
.out
)
1854 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
1855 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
1856 var
->mode
= ir_var_shader_out
;
1857 else if (qual
->flags
.q
.uniform
)
1858 var
->mode
= ir_var_uniform
;
1860 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
1861 /* This variable is being used to link data between shader stages (in
1862 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
1863 * that is allowed for such purposes.
1865 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1867 * "The varying qualifier can be used only with the data types
1868 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1871 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
1872 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
1874 * "Fragment inputs can only be signed and unsigned integers and
1875 * integer vectors, float, floating-point vectors, matrices, or
1876 * arrays of these. Structures cannot be input.
1878 * Similar text exists in the section on vertex shader outputs.
1880 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
1881 * 3.00 spec allows structs as well. Varying structs are also allowed
1884 switch (var
->type
->get_scalar_type()->base_type
) {
1885 case GLSL_TYPE_FLOAT
:
1886 /* Ok in all GLSL versions */
1888 case GLSL_TYPE_UINT
:
1890 if (state
->is_version(130, 300))
1892 _mesa_glsl_error(loc
, state
,
1893 "varying variables must be of base type float in %s",
1894 state
->get_version_string());
1896 case GLSL_TYPE_STRUCT
:
1897 if (state
->is_version(150, 300))
1899 _mesa_glsl_error(loc
, state
,
1900 "varying variables may not be of type struct");
1903 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
1908 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1909 switch (state
->target
) {
1911 if (var
->mode
== ir_var_shader_out
)
1912 var
->invariant
= true;
1914 case geometry_shader
:
1915 if ((var
->mode
== ir_var_shader_in
)
1916 || (var
->mode
== ir_var_shader_out
))
1917 var
->invariant
= true;
1919 case fragment_shader
:
1920 if (var
->mode
== ir_var_shader_in
)
1921 var
->invariant
= true;
1926 if (qual
->flags
.q
.flat
)
1927 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
1928 else if (qual
->flags
.q
.noperspective
)
1929 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
1930 else if (qual
->flags
.q
.smooth
)
1931 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
1933 var
->interpolation
= INTERP_QUALIFIER_NONE
;
1935 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
1936 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
) &&
1937 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)) {
1938 _mesa_glsl_error(loc
, state
,
1939 "interpolation qualifier `%s' can only be applied to "
1940 "vertex shader outputs and fragment shader inputs.",
1941 var
->interpolation_string());
1944 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1945 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1946 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1947 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1948 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1949 ? "origin_upper_left" : "pixel_center_integer";
1951 _mesa_glsl_error(loc
, state
,
1952 "layout qualifier `%s' can only be applied to "
1953 "fragment shader input `gl_FragCoord'",
1957 if (qual
->flags
.q
.explicit_location
) {
1958 const bool global_scope
= (state
->current_function
== NULL
);
1960 const char *string
= "";
1962 /* In the vertex shader only shader inputs can be given explicit
1965 * In the fragment shader only shader outputs can be given explicit
1968 switch (state
->target
) {
1970 if (!global_scope
|| (var
->mode
!= ir_var_shader_in
)) {
1976 case geometry_shader
:
1977 _mesa_glsl_error(loc
, state
,
1978 "geometry shader variables cannot be given "
1979 "explicit locations\n");
1982 case fragment_shader
:
1983 if (!global_scope
|| (var
->mode
!= ir_var_shader_out
)) {
1991 _mesa_glsl_error(loc
, state
,
1992 "only %s shader %s variables can be given an "
1993 "explicit location\n",
1994 _mesa_glsl_shader_target_name(state
->target
),
1997 var
->explicit_location
= true;
1999 /* This bit of silliness is needed because invalid explicit locations
2000 * are supposed to be flagged during linking. Small negative values
2001 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2002 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2003 * The linker needs to be able to differentiate these cases. This
2004 * ensures that negative values stay negative.
2006 if (qual
->location
>= 0) {
2007 var
->location
= (state
->target
== vertex_shader
)
2008 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2009 : (qual
->location
+ FRAG_RESULT_DATA0
);
2011 var
->location
= qual
->location
;
2014 if (qual
->flags
.q
.explicit_index
) {
2015 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2016 * Layout Qualifiers):
2018 * "It is also a compile-time error if a fragment shader
2019 * sets a layout index to less than 0 or greater than 1."
2021 * Older specifications don't mandate a behavior; we take
2022 * this as a clarification and always generate the error.
2024 if (qual
->index
< 0 || qual
->index
> 1) {
2025 _mesa_glsl_error(loc
, state
,
2026 "explicit index may only be 0 or 1\n");
2028 var
->explicit_index
= true;
2029 var
->index
= qual
->index
;
2033 } else if (qual
->flags
.q
.explicit_index
) {
2034 _mesa_glsl_error(loc
, state
,
2035 "explicit index requires explicit location\n");
2038 /* Does the declaration use the 'layout' keyword?
2040 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2041 || qual
->flags
.q
.origin_upper_left
2042 || qual
->flags
.q
.explicit_location
; /* no need for index since it relies on location */
2044 /* Does the declaration use the deprecated 'attribute' or 'varying'
2047 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2048 || qual
->flags
.q
.varying
;
2050 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2051 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2052 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2053 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2054 * These extensions and all following extensions that add the 'layout'
2055 * keyword have been modified to require the use of 'in' or 'out'.
2057 * The following extension do not allow the deprecated keywords:
2059 * GL_AMD_conservative_depth
2060 * GL_ARB_conservative_depth
2061 * GL_ARB_gpu_shader5
2062 * GL_ARB_separate_shader_objects
2063 * GL_ARB_tesselation_shader
2064 * GL_ARB_transform_feedback3
2065 * GL_ARB_uniform_buffer_object
2067 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2068 * allow layout with the deprecated keywords.
2070 const bool relaxed_layout_qualifier_checking
=
2071 state
->ARB_fragment_coord_conventions_enable
;
2073 if (uses_layout
&& uses_deprecated_qualifier
) {
2074 if (relaxed_layout_qualifier_checking
) {
2075 _mesa_glsl_warning(loc
, state
,
2076 "`layout' qualifier may not be used with "
2077 "`attribute' or `varying'");
2079 _mesa_glsl_error(loc
, state
,
2080 "`layout' qualifier may not be used with "
2081 "`attribute' or `varying'");
2085 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2086 * AMD_conservative_depth.
2088 int depth_layout_count
= qual
->flags
.q
.depth_any
2089 + qual
->flags
.q
.depth_greater
2090 + qual
->flags
.q
.depth_less
2091 + qual
->flags
.q
.depth_unchanged
;
2092 if (depth_layout_count
> 0
2093 && !state
->AMD_conservative_depth_enable
2094 && !state
->ARB_conservative_depth_enable
) {
2095 _mesa_glsl_error(loc
, state
,
2096 "extension GL_AMD_conservative_depth or "
2097 "GL_ARB_conservative_depth must be enabled "
2098 "to use depth layout qualifiers");
2099 } else if (depth_layout_count
> 0
2100 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2101 _mesa_glsl_error(loc
, state
,
2102 "depth layout qualifiers can be applied only to "
2104 } else if (depth_layout_count
> 1
2105 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2106 _mesa_glsl_error(loc
, state
,
2107 "at most one depth layout qualifier can be applied to "
2110 if (qual
->flags
.q
.depth_any
)
2111 var
->depth_layout
= ir_depth_layout_any
;
2112 else if (qual
->flags
.q
.depth_greater
)
2113 var
->depth_layout
= ir_depth_layout_greater
;
2114 else if (qual
->flags
.q
.depth_less
)
2115 var
->depth_layout
= ir_depth_layout_less
;
2116 else if (qual
->flags
.q
.depth_unchanged
)
2117 var
->depth_layout
= ir_depth_layout_unchanged
;
2119 var
->depth_layout
= ir_depth_layout_none
;
2121 if (qual
->flags
.q
.std140
||
2122 qual
->flags
.q
.packed
||
2123 qual
->flags
.q
.shared
) {
2124 _mesa_glsl_error(loc
, state
,
2125 "uniform block layout qualifiers std140, packed, and "
2126 "shared can only be applied to uniform blocks, not "
2130 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2131 if (!ubo_qualifiers_valid
) {
2132 _mesa_glsl_error(loc
, state
,
2133 "uniform block layout qualifiers row_major and "
2134 "column_major can only be applied to uniform block "
2137 validate_matrix_layout_for_type(state
, loc
, var
->type
);
2142 * Get the variable that is being redeclared by this declaration
2144 * Semantic checks to verify the validity of the redeclaration are also
2145 * performed. If semantic checks fail, compilation error will be emitted via
2146 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2149 * A pointer to an existing variable in the current scope if the declaration
2150 * is a redeclaration, \c NULL otherwise.
2153 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2154 struct _mesa_glsl_parse_state
*state
)
2156 /* Check if this declaration is actually a re-declaration, either to
2157 * resize an array or add qualifiers to an existing variable.
2159 * This is allowed for variables in the current scope, or when at
2160 * global scope (for built-ins in the implicit outer scope).
2162 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2163 if (earlier
== NULL
||
2164 (state
->current_function
!= NULL
&&
2165 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2170 YYLTYPE loc
= decl
->get_location();
2172 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2174 * "It is legal to declare an array without a size and then
2175 * later re-declare the same name as an array of the same
2176 * type and specify a size."
2178 if ((earlier
->type
->array_size() == 0)
2179 && var
->type
->is_array()
2180 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2181 /* FINISHME: This doesn't match the qualifiers on the two
2182 * FINISHME: declarations. It's not 100% clear whether this is
2183 * FINISHME: required or not.
2186 const unsigned size
= unsigned(var
->type
->array_size());
2187 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2188 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2189 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2191 earlier
->max_array_access
);
2194 earlier
->type
= var
->type
;
2197 } else if (state
->ARB_fragment_coord_conventions_enable
2198 && strcmp(var
->name
, "gl_FragCoord") == 0
2199 && earlier
->type
== var
->type
2200 && earlier
->mode
== var
->mode
) {
2201 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2204 earlier
->origin_upper_left
= var
->origin_upper_left
;
2205 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2207 /* According to section 4.3.7 of the GLSL 1.30 spec,
2208 * the following built-in varaibles can be redeclared with an
2209 * interpolation qualifier:
2212 * * gl_FrontSecondaryColor
2213 * * gl_BackSecondaryColor
2215 * * gl_SecondaryColor
2217 } else if (state
->is_version(130, 0)
2218 && (strcmp(var
->name
, "gl_FrontColor") == 0
2219 || strcmp(var
->name
, "gl_BackColor") == 0
2220 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2221 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2222 || strcmp(var
->name
, "gl_Color") == 0
2223 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2224 && earlier
->type
== var
->type
2225 && earlier
->mode
== var
->mode
) {
2226 earlier
->interpolation
= var
->interpolation
;
2228 /* Layout qualifiers for gl_FragDepth. */
2229 } else if ((state
->AMD_conservative_depth_enable
||
2230 state
->ARB_conservative_depth_enable
)
2231 && strcmp(var
->name
, "gl_FragDepth") == 0
2232 && earlier
->type
== var
->type
2233 && earlier
->mode
== var
->mode
) {
2235 /** From the AMD_conservative_depth spec:
2236 * Within any shader, the first redeclarations of gl_FragDepth
2237 * must appear before any use of gl_FragDepth.
2239 if (earlier
->used
) {
2240 _mesa_glsl_error(&loc
, state
,
2241 "the first redeclaration of gl_FragDepth "
2242 "must appear before any use of gl_FragDepth");
2245 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2246 if (earlier
->depth_layout
!= ir_depth_layout_none
2247 && earlier
->depth_layout
!= var
->depth_layout
) {
2248 _mesa_glsl_error(&loc
, state
,
2249 "gl_FragDepth: depth layout is declared here "
2250 "as '%s, but it was previously declared as "
2252 depth_layout_string(var
->depth_layout
),
2253 depth_layout_string(earlier
->depth_layout
));
2256 earlier
->depth_layout
= var
->depth_layout
;
2259 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2266 * Generate the IR for an initializer in a variable declaration
2269 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2270 ast_fully_specified_type
*type
,
2271 exec_list
*initializer_instructions
,
2272 struct _mesa_glsl_parse_state
*state
)
2274 ir_rvalue
*result
= NULL
;
2276 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2278 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2280 * "All uniform variables are read-only and are initialized either
2281 * directly by an application via API commands, or indirectly by
2284 if (var
->mode
== ir_var_uniform
) {
2285 state
->check_version(120, 0, &initializer_loc
,
2286 "cannot initialize uniforms");
2289 if (var
->type
->is_sampler()) {
2290 _mesa_glsl_error(& initializer_loc
, state
,
2291 "cannot initialize samplers");
2294 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2295 _mesa_glsl_error(& initializer_loc
, state
,
2296 "cannot initialize %s shader input / %s",
2297 _mesa_glsl_shader_target_name(state
->target
),
2298 (state
->target
== vertex_shader
)
2299 ? "attribute" : "varying");
2302 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2303 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2306 /* Calculate the constant value if this is a const or uniform
2309 if (type
->qualifier
.flags
.q
.constant
2310 || type
->qualifier
.flags
.q
.uniform
) {
2311 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2312 if (new_rhs
!= NULL
) {
2315 ir_constant
*constant_value
= rhs
->constant_expression_value();
2316 if (!constant_value
) {
2317 _mesa_glsl_error(& initializer_loc
, state
,
2318 "initializer of %s variable `%s' must be a "
2319 "constant expression",
2320 (type
->qualifier
.flags
.q
.constant
)
2321 ? "const" : "uniform",
2323 if (var
->type
->is_numeric()) {
2324 /* Reduce cascading errors. */
2325 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2328 rhs
= constant_value
;
2329 var
->constant_value
= constant_value
;
2332 _mesa_glsl_error(&initializer_loc
, state
,
2333 "initializer of type %s cannot be assigned to "
2334 "variable of type %s",
2335 rhs
->type
->name
, var
->type
->name
);
2336 if (var
->type
->is_numeric()) {
2337 /* Reduce cascading errors. */
2338 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2343 if (rhs
&& !rhs
->type
->is_error()) {
2344 bool temp
= var
->read_only
;
2345 if (type
->qualifier
.flags
.q
.constant
)
2346 var
->read_only
= false;
2348 /* Never emit code to initialize a uniform.
2350 const glsl_type
*initializer_type
;
2351 if (!type
->qualifier
.flags
.q
.uniform
) {
2352 result
= do_assignment(initializer_instructions
, state
,
2355 type
->get_location());
2356 initializer_type
= result
->type
;
2358 initializer_type
= rhs
->type
;
2360 var
->constant_initializer
= rhs
->constant_expression_value();
2361 var
->has_initializer
= true;
2363 /* If the declared variable is an unsized array, it must inherrit
2364 * its full type from the initializer. A declaration such as
2366 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2370 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2372 * The assignment generated in the if-statement (below) will also
2373 * automatically handle this case for non-uniforms.
2375 * If the declared variable is not an array, the types must
2376 * already match exactly. As a result, the type assignment
2377 * here can be done unconditionally. For non-uniforms the call
2378 * to do_assignment can change the type of the initializer (via
2379 * the implicit conversion rules). For uniforms the initializer
2380 * must be a constant expression, and the type of that expression
2381 * was validated above.
2383 var
->type
= initializer_type
;
2385 var
->read_only
= temp
;
2392 ast_declarator_list::hir(exec_list
*instructions
,
2393 struct _mesa_glsl_parse_state
*state
)
2396 const struct glsl_type
*decl_type
;
2397 const char *type_name
= NULL
;
2398 ir_rvalue
*result
= NULL
;
2399 YYLTYPE loc
= this->get_location();
2401 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2403 * "To ensure that a particular output variable is invariant, it is
2404 * necessary to use the invariant qualifier. It can either be used to
2405 * qualify a previously declared variable as being invariant
2407 * invariant gl_Position; // make existing gl_Position be invariant"
2409 * In these cases the parser will set the 'invariant' flag in the declarator
2410 * list, and the type will be NULL.
2412 if (this->invariant
) {
2413 assert(this->type
== NULL
);
2415 if (state
->current_function
!= NULL
) {
2416 _mesa_glsl_error(& loc
, state
,
2417 "All uses of `invariant' keyword must be at global "
2421 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2422 assert(!decl
->is_array
);
2423 assert(decl
->array_size
== NULL
);
2424 assert(decl
->initializer
== NULL
);
2426 ir_variable
*const earlier
=
2427 state
->symbols
->get_variable(decl
->identifier
);
2428 if (earlier
== NULL
) {
2429 _mesa_glsl_error(& loc
, state
,
2430 "Undeclared variable `%s' cannot be marked "
2431 "invariant\n", decl
->identifier
);
2432 } else if ((state
->target
== vertex_shader
)
2433 && (earlier
->mode
!= ir_var_shader_out
)) {
2434 _mesa_glsl_error(& loc
, state
,
2435 "`%s' cannot be marked invariant, vertex shader "
2436 "outputs only\n", decl
->identifier
);
2437 } else if ((state
->target
== fragment_shader
)
2438 && (earlier
->mode
!= ir_var_shader_in
)) {
2439 _mesa_glsl_error(& loc
, state
,
2440 "`%s' cannot be marked invariant, fragment shader "
2441 "inputs only\n", decl
->identifier
);
2442 } else if (earlier
->used
) {
2443 _mesa_glsl_error(& loc
, state
,
2444 "variable `%s' may not be redeclared "
2445 "`invariant' after being used",
2448 earlier
->invariant
= true;
2452 /* Invariant redeclarations do not have r-values.
2457 assert(this->type
!= NULL
);
2458 assert(!this->invariant
);
2460 /* The type specifier may contain a structure definition. Process that
2461 * before any of the variable declarations.
2463 (void) this->type
->specifier
->hir(instructions
, state
);
2465 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2466 if (this->declarations
.is_empty()) {
2467 /* If there is no structure involved in the program text, there are two
2468 * possible scenarios:
2470 * - The program text contained something like 'vec4;'. This is an
2471 * empty declaration. It is valid but weird. Emit a warning.
2473 * - The program text contained something like 'S;' and 'S' is not the
2474 * name of a known structure type. This is both invalid and weird.
2477 * Note that if decl_type is NULL and there is a structure involved,
2478 * there must have been some sort of error with the structure. In this
2479 * case we assume that an error was already generated on this line of
2480 * code for the structure. There is no need to generate an additional,
2483 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2485 if (this->type
->specifier
->structure
== NULL
) {
2486 if (decl_type
!= NULL
) {
2487 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2489 _mesa_glsl_error(&loc
, state
,
2490 "invalid type `%s' in empty declaration",
2496 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2497 const struct glsl_type
*var_type
;
2500 /* FINISHME: Emit a warning if a variable declaration shadows a
2501 * FINISHME: declaration at a higher scope.
2504 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2505 if (type_name
!= NULL
) {
2506 _mesa_glsl_error(& loc
, state
,
2507 "invalid type `%s' in declaration of `%s'",
2508 type_name
, decl
->identifier
);
2510 _mesa_glsl_error(& loc
, state
,
2511 "invalid type in declaration of `%s'",
2517 if (decl
->is_array
) {
2518 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2520 if (var_type
->is_error())
2523 var_type
= decl_type
;
2526 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2528 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2530 * "Global variables can only use the qualifiers const,
2531 * attribute, uni form, or varying. Only one may be
2534 * Local variables can only use the qualifier const."
2536 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2537 * any extension that adds the 'layout' keyword.
2539 if (!state
->is_version(130, 300)
2540 && !state
->ARB_explicit_attrib_location_enable
2541 && !state
->ARB_fragment_coord_conventions_enable
) {
2542 if (this->type
->qualifier
.flags
.q
.out
) {
2543 _mesa_glsl_error(& loc
, state
,
2544 "`out' qualifier in declaration of `%s' "
2545 "only valid for function parameters in %s.",
2546 decl
->identifier
, state
->get_version_string());
2548 if (this->type
->qualifier
.flags
.q
.in
) {
2549 _mesa_glsl_error(& loc
, state
,
2550 "`in' qualifier in declaration of `%s' "
2551 "only valid for function parameters in %s.",
2552 decl
->identifier
, state
->get_version_string());
2554 /* FINISHME: Test for other invalid qualifiers. */
2557 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2558 & loc
, this->ubo_qualifiers_valid
, false);
2560 if (this->type
->qualifier
.flags
.q
.invariant
) {
2561 if ((state
->target
== vertex_shader
) &&
2562 var
->mode
!= ir_var_shader_out
) {
2563 _mesa_glsl_error(& loc
, state
,
2564 "`%s' cannot be marked invariant, vertex shader "
2565 "outputs only\n", var
->name
);
2566 } else if ((state
->target
== fragment_shader
) &&
2567 var
->mode
!= ir_var_shader_in
) {
2568 /* FINISHME: Note that this doesn't work for invariant on
2569 * a function signature inval
2571 _mesa_glsl_error(& loc
, state
,
2572 "`%s' cannot be marked invariant, fragment shader "
2573 "inputs only\n", var
->name
);
2577 if (state
->current_function
!= NULL
) {
2578 const char *mode
= NULL
;
2579 const char *extra
= "";
2581 /* There is no need to check for 'inout' here because the parser will
2582 * only allow that in function parameter lists.
2584 if (this->type
->qualifier
.flags
.q
.attribute
) {
2586 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2588 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2590 } else if (this->type
->qualifier
.flags
.q
.in
) {
2592 extra
= " or in function parameter list";
2593 } else if (this->type
->qualifier
.flags
.q
.out
) {
2595 extra
= " or in function parameter list";
2599 _mesa_glsl_error(& loc
, state
,
2600 "%s variable `%s' must be declared at "
2602 mode
, var
->name
, extra
);
2604 } else if (var
->mode
== ir_var_shader_in
) {
2605 var
->read_only
= true;
2607 if (state
->target
== vertex_shader
) {
2608 bool error_emitted
= false;
2610 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2612 * "Vertex shader inputs can only be float, floating-point
2613 * vectors, matrices, signed and unsigned integers and integer
2614 * vectors. Vertex shader inputs can also form arrays of these
2615 * types, but not structures."
2617 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2619 * "Vertex shader inputs can only be float, floating-point
2620 * vectors, matrices, signed and unsigned integers and integer
2621 * vectors. They cannot be arrays or structures."
2623 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2625 * "The attribute qualifier can be used only with float,
2626 * floating-point vectors, and matrices. Attribute variables
2627 * cannot be declared as arrays or structures."
2629 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
2631 * "Vertex shader inputs can only be float, floating-point
2632 * vectors, matrices, signed and unsigned integers and integer
2633 * vectors. Vertex shader inputs cannot be arrays or
2636 const glsl_type
*check_type
= var
->type
->is_array()
2637 ? var
->type
->fields
.array
: var
->type
;
2639 switch (check_type
->base_type
) {
2640 case GLSL_TYPE_FLOAT
:
2642 case GLSL_TYPE_UINT
:
2644 if (state
->is_version(120, 300))
2648 _mesa_glsl_error(& loc
, state
,
2649 "vertex shader input / attribute cannot have "
2651 var
->type
->is_array() ? "array of " : "",
2653 error_emitted
= true;
2656 if (!error_emitted
&& var
->type
->is_array() &&
2657 !state
->check_version(140, 0, &loc
,
2658 "vertex shader input / attribute "
2659 "cannot have array type")) {
2660 error_emitted
= true;
2665 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2666 * so must integer vertex outputs.
2668 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2669 * "Fragment shader inputs that are signed or unsigned integers or
2670 * integer vectors must be qualified with the interpolation qualifier
2673 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2674 * "Fragment shader inputs that are, or contain, signed or unsigned
2675 * integers or integer vectors must be qualified with the
2676 * interpolation qualifier flat."
2678 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2679 * "Vertex shader outputs that are, or contain, signed or unsigned
2680 * integers or integer vectors must be qualified with the
2681 * interpolation qualifier flat."
2683 * Note that prior to GLSL 1.50, this requirement applied to vertex
2684 * outputs rather than fragment inputs. That creates problems in the
2685 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2686 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2687 * apply the restriction to both vertex outputs and fragment inputs.
2689 * Note also that the desktop GLSL specs are missing the text "or
2690 * contain"; this is presumably an oversight, since there is no
2691 * reasonable way to interpolate a fragment shader input that contains
2694 if (state
->is_version(130, 300) &&
2695 var
->type
->contains_integer() &&
2696 var
->interpolation
!= INTERP_QUALIFIER_FLAT
&&
2697 ((state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)
2698 || (state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
2699 && state
->es_shader
))) {
2700 const char *var_type
= (state
->target
== vertex_shader
) ?
2701 "vertex output" : "fragment input";
2702 _mesa_glsl_error(&loc
, state
, "If a %s is (or contains) "
2703 "an integer, then it must be qualified with 'flat'",
2708 /* Interpolation qualifiers cannot be applied to 'centroid' and
2709 * 'centroid varying'.
2711 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2712 * "interpolation qualifiers may only precede the qualifiers in,
2713 * centroid in, out, or centroid out in a declaration. They do not apply
2714 * to the deprecated storage qualifiers varying or centroid varying."
2716 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2718 if (state
->is_version(130, 0)
2719 && this->type
->qualifier
.has_interpolation()
2720 && this->type
->qualifier
.flags
.q
.varying
) {
2722 const char *i
= this->type
->qualifier
.interpolation_string();
2725 if (this->type
->qualifier
.flags
.q
.centroid
)
2726 s
= "centroid varying";
2730 _mesa_glsl_error(&loc
, state
,
2731 "qualifier '%s' cannot be applied to the "
2732 "deprecated storage qualifier '%s'", i
, s
);
2736 /* Interpolation qualifiers can only apply to vertex shader outputs and
2737 * fragment shader inputs.
2739 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2740 * "Outputs from a vertex shader (out) and inputs to a fragment
2741 * shader (in) can be further qualified with one or more of these
2742 * interpolation qualifiers"
2744 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
2745 * "These interpolation qualifiers may only precede the qualifiers
2746 * in, centroid in, out, or centroid out in a declaration. They do
2747 * not apply to inputs into a vertex shader or outputs from a
2750 if (state
->is_version(130, 300)
2751 && this->type
->qualifier
.has_interpolation()) {
2753 const char *i
= this->type
->qualifier
.interpolation_string();
2756 switch (state
->target
) {
2758 if (this->type
->qualifier
.flags
.q
.in
) {
2759 _mesa_glsl_error(&loc
, state
,
2760 "qualifier '%s' cannot be applied to vertex "
2761 "shader inputs", i
);
2764 case fragment_shader
:
2765 if (this->type
->qualifier
.flags
.q
.out
) {
2766 _mesa_glsl_error(&loc
, state
,
2767 "qualifier '%s' cannot be applied to fragment "
2768 "shader outputs", i
);
2777 /* From section 4.3.4 of the GLSL 1.30 spec:
2778 * "It is an error to use centroid in in a vertex shader."
2780 * From section 4.3.4 of the GLSL ES 3.00 spec:
2781 * "It is an error to use centroid in or interpolation qualifiers in
2782 * a vertex shader input."
2784 if (state
->is_version(130, 300)
2785 && this->type
->qualifier
.flags
.q
.centroid
2786 && this->type
->qualifier
.flags
.q
.in
2787 && state
->target
== vertex_shader
) {
2789 _mesa_glsl_error(&loc
, state
,
2790 "'centroid in' cannot be used in a vertex shader");
2794 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2796 if (this->type
->specifier
->precision
!= ast_precision_none
) {
2797 state
->check_precision_qualifiers_allowed(&loc
);
2801 /* Precision qualifiers only apply to floating point and integer types.
2803 * From section 4.5.2 of the GLSL 1.30 spec:
2804 * "Any floating point or any integer declaration can have the type
2805 * preceded by one of these precision qualifiers [...] Literal
2806 * constants do not have precision qualifiers. Neither do Boolean
2809 * In GLSL ES, sampler types are also allowed.
2811 * From page 87 of the GLSL ES spec:
2812 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2814 if (this->type
->specifier
->precision
!= ast_precision_none
2815 && !var
->type
->is_float()
2816 && !var
->type
->is_integer()
2817 && !(var
->type
->is_sampler() && state
->es_shader
)
2818 && !(var
->type
->is_array()
2819 && (var
->type
->fields
.array
->is_float()
2820 || var
->type
->fields
.array
->is_integer()))) {
2822 _mesa_glsl_error(&loc
, state
,
2823 "precision qualifiers apply only to floating point"
2824 "%s types", state
->es_shader
? ", integer, and sampler"
2828 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2830 * "[Sampler types] can only be declared as function
2831 * parameters or uniform variables (see Section 4.3.5
2834 if (var_type
->contains_sampler() &&
2835 !this->type
->qualifier
.flags
.q
.uniform
) {
2836 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2839 /* Process the initializer and add its instructions to a temporary
2840 * list. This list will be added to the instruction stream (below) after
2841 * the declaration is added. This is done because in some cases (such as
2842 * redeclarations) the declaration may not actually be added to the
2843 * instruction stream.
2845 exec_list initializer_instructions
;
2846 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2848 if (decl
->initializer
!= NULL
) {
2849 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2851 &initializer_instructions
, state
);
2854 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2856 * "It is an error to write to a const variable outside of
2857 * its declaration, so they must be initialized when
2860 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2861 _mesa_glsl_error(& loc
, state
,
2862 "const declaration of `%s' must be initialized",
2866 /* If the declaration is not a redeclaration, there are a few additional
2867 * semantic checks that must be applied. In addition, variable that was
2868 * created for the declaration should be added to the IR stream.
2870 if (earlier
== NULL
) {
2871 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2873 * "Identifiers starting with "gl_" are reserved for use by
2874 * OpenGL, and may not be declared in a shader as either a
2875 * variable or a function."
2877 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2878 _mesa_glsl_error(& loc
, state
,
2879 "identifier `%s' uses reserved `gl_' prefix",
2881 else if (strstr(decl
->identifier
, "__")) {
2882 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2885 * "In addition, all identifiers containing two
2886 * consecutive underscores (__) are reserved as
2887 * possible future keywords."
2889 _mesa_glsl_error(& loc
, state
,
2890 "identifier `%s' uses reserved `__' string",
2894 /* Add the variable to the symbol table. Note that the initializer's
2895 * IR was already processed earlier (though it hasn't been emitted
2896 * yet), without the variable in scope.
2898 * This differs from most C-like languages, but it follows the GLSL
2899 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2902 * "Within a declaration, the scope of a name starts immediately
2903 * after the initializer if present or immediately after the name
2904 * being declared if not."
2906 if (!state
->symbols
->add_variable(var
)) {
2907 YYLTYPE loc
= this->get_location();
2908 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2909 "current scope", decl
->identifier
);
2913 /* Push the variable declaration to the top. It means that all the
2914 * variable declarations will appear in a funny last-to-first order,
2915 * but otherwise we run into trouble if a function is prototyped, a
2916 * global var is decled, then the function is defined with usage of
2917 * the global var. See glslparsertest's CorrectModule.frag.
2919 instructions
->push_head(var
);
2922 instructions
->append_list(&initializer_instructions
);
2926 /* Generally, variable declarations do not have r-values. However,
2927 * one is used for the declaration in
2929 * while (bool b = some_condition()) {
2933 * so we return the rvalue from the last seen declaration here.
2940 ast_parameter_declarator::hir(exec_list
*instructions
,
2941 struct _mesa_glsl_parse_state
*state
)
2944 const struct glsl_type
*type
;
2945 const char *name
= NULL
;
2946 YYLTYPE loc
= this->get_location();
2948 type
= this->type
->specifier
->glsl_type(& name
, state
);
2952 _mesa_glsl_error(& loc
, state
,
2953 "invalid type `%s' in declaration of `%s'",
2954 name
, this->identifier
);
2956 _mesa_glsl_error(& loc
, state
,
2957 "invalid type in declaration of `%s'",
2961 type
= glsl_type::error_type
;
2964 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2966 * "Functions that accept no input arguments need not use void in the
2967 * argument list because prototypes (or definitions) are required and
2968 * therefore there is no ambiguity when an empty argument list "( )" is
2969 * declared. The idiom "(void)" as a parameter list is provided for
2972 * Placing this check here prevents a void parameter being set up
2973 * for a function, which avoids tripping up checks for main taking
2974 * parameters and lookups of an unnamed symbol.
2976 if (type
->is_void()) {
2977 if (this->identifier
!= NULL
)
2978 _mesa_glsl_error(& loc
, state
,
2979 "named parameter cannot have type `void'");
2985 if (formal_parameter
&& (this->identifier
== NULL
)) {
2986 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2990 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2991 * call already handled the "vec4[..] foo" case.
2993 if (this->is_array
) {
2994 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2997 if (!type
->is_error() && type
->array_size() == 0) {
2998 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2999 "a declared size.");
3000 type
= glsl_type::error_type
;
3004 ir_variable
*var
= new(ctx
)
3005 ir_variable(type
, this->identifier
, ir_var_function_in
);
3007 /* Apply any specified qualifiers to the parameter declaration. Note that
3008 * for function parameters the default mode is 'in'.
3010 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3013 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3015 * "Samplers cannot be treated as l-values; hence cannot be used
3016 * as out or inout function parameters, nor can they be assigned
3019 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3020 && type
->contains_sampler()) {
3021 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3022 type
= glsl_type::error_type
;
3025 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3027 * "When calling a function, expressions that do not evaluate to
3028 * l-values cannot be passed to parameters declared as out or inout."
3030 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3032 * "Other binary or unary expressions, non-dereferenced arrays,
3033 * function names, swizzles with repeated fields, and constants
3034 * cannot be l-values."
3036 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3037 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3039 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3041 && !state
->check_version(120, 100, &loc
,
3042 "Arrays cannot be out or inout parameters")) {
3043 type
= glsl_type::error_type
;
3046 instructions
->push_tail(var
);
3048 /* Parameter declarations do not have r-values.
3055 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3057 exec_list
*ir_parameters
,
3058 _mesa_glsl_parse_state
*state
)
3060 ast_parameter_declarator
*void_param
= NULL
;
3063 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3064 param
->formal_parameter
= formal
;
3065 param
->hir(ir_parameters
, state
);
3073 if ((void_param
!= NULL
) && (count
> 1)) {
3074 YYLTYPE loc
= void_param
->get_location();
3076 _mesa_glsl_error(& loc
, state
,
3077 "`void' parameter must be only parameter");
3083 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3085 /* IR invariants disallow function declarations or definitions
3086 * nested within other function definitions. But there is no
3087 * requirement about the relative order of function declarations
3088 * and definitions with respect to one another. So simply insert
3089 * the new ir_function block at the end of the toplevel instruction
3092 state
->toplevel_ir
->push_tail(f
);
3097 ast_function::hir(exec_list
*instructions
,
3098 struct _mesa_glsl_parse_state
*state
)
3101 ir_function
*f
= NULL
;
3102 ir_function_signature
*sig
= NULL
;
3103 exec_list hir_parameters
;
3105 const char *const name
= identifier
;
3107 /* New functions are always added to the top-level IR instruction stream,
3108 * so this instruction list pointer is ignored. See also emit_function
3111 (void) instructions
;
3113 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3115 * "Function declarations (prototypes) cannot occur inside of functions;
3116 * they must be at global scope, or for the built-in functions, outside
3117 * the global scope."
3119 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3121 * "User defined functions may only be defined within the global scope."
3123 * Note that this language does not appear in GLSL 1.10.
3125 if ((state
->current_function
!= NULL
) &&
3126 state
->is_version(120, 100)) {
3127 YYLTYPE loc
= this->get_location();
3128 _mesa_glsl_error(&loc
, state
,
3129 "declaration of function `%s' not allowed within "
3130 "function body", name
);
3133 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3135 * "Identifiers starting with "gl_" are reserved for use by
3136 * OpenGL, and may not be declared in a shader as either a
3137 * variable or a function."
3139 if (strncmp(name
, "gl_", 3) == 0) {
3140 YYLTYPE loc
= this->get_location();
3141 _mesa_glsl_error(&loc
, state
,
3142 "identifier `%s' uses reserved `gl_' prefix", name
);
3145 /* Convert the list of function parameters to HIR now so that they can be
3146 * used below to compare this function's signature with previously seen
3147 * signatures for functions with the same name.
3149 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3151 & hir_parameters
, state
);
3153 const char *return_type_name
;
3154 const glsl_type
*return_type
=
3155 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3158 YYLTYPE loc
= this->get_location();
3159 _mesa_glsl_error(&loc
, state
,
3160 "function `%s' has undeclared return type `%s'",
3161 name
, return_type_name
);
3162 return_type
= glsl_type::error_type
;
3165 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3166 * "No qualifier is allowed on the return type of a function."
3168 if (this->return_type
->has_qualifiers()) {
3169 YYLTYPE loc
= this->get_location();
3170 _mesa_glsl_error(& loc
, state
,
3171 "function `%s' return type has qualifiers", name
);
3174 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3176 * "[Sampler types] can only be declared as function parameters
3177 * or uniform variables (see Section 4.3.5 "Uniform")".
3179 if (return_type
->contains_sampler()) {
3180 YYLTYPE loc
= this->get_location();
3181 _mesa_glsl_error(&loc
, state
,
3182 "function `%s' return type can't contain a sampler",
3186 /* Verify that this function's signature either doesn't match a previously
3187 * seen signature for a function with the same name, or, if a match is found,
3188 * that the previously seen signature does not have an associated definition.
3190 f
= state
->symbols
->get_function(name
);
3191 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3192 sig
= f
->exact_matching_signature(&hir_parameters
);
3194 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3195 if (badvar
!= NULL
) {
3196 YYLTYPE loc
= this->get_location();
3198 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3199 "qualifiers don't match prototype", name
, badvar
);
3202 if (sig
->return_type
!= return_type
) {
3203 YYLTYPE loc
= this->get_location();
3205 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3206 "match prototype", name
);
3209 if (is_definition
&& sig
->is_defined
) {
3210 YYLTYPE loc
= this->get_location();
3212 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3216 f
= new(ctx
) ir_function(name
);
3217 if (!state
->symbols
->add_function(f
)) {
3218 /* This function name shadows a non-function use of the same name. */
3219 YYLTYPE loc
= this->get_location();
3221 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3222 "non-function", name
);
3226 emit_function(state
, f
);
3229 /* Verify the return type of main() */
3230 if (strcmp(name
, "main") == 0) {
3231 if (! return_type
->is_void()) {
3232 YYLTYPE loc
= this->get_location();
3234 _mesa_glsl_error(& loc
, state
, "main() must return void");
3237 if (!hir_parameters
.is_empty()) {
3238 YYLTYPE loc
= this->get_location();
3240 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3244 /* Finish storing the information about this new function in its signature.
3247 sig
= new(ctx
) ir_function_signature(return_type
);
3248 f
->add_signature(sig
);
3251 sig
->replace_parameters(&hir_parameters
);
3254 /* Function declarations (prototypes) do not have r-values.
3261 ast_function_definition::hir(exec_list
*instructions
,
3262 struct _mesa_glsl_parse_state
*state
)
3264 prototype
->is_definition
= true;
3265 prototype
->hir(instructions
, state
);
3267 ir_function_signature
*signature
= prototype
->signature
;
3268 if (signature
== NULL
)
3271 assert(state
->current_function
== NULL
);
3272 state
->current_function
= signature
;
3273 state
->found_return
= false;
3275 /* Duplicate parameters declared in the prototype as concrete variables.
3276 * Add these to the symbol table.
3278 state
->symbols
->push_scope();
3279 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3280 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3282 assert(var
!= NULL
);
3284 /* The only way a parameter would "exist" is if two parameters have
3287 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3288 YYLTYPE loc
= this->get_location();
3290 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3292 state
->symbols
->add_variable(var
);
3296 /* Convert the body of the function to HIR. */
3297 this->body
->hir(&signature
->body
, state
);
3298 signature
->is_defined
= true;
3300 state
->symbols
->pop_scope();
3302 assert(state
->current_function
== signature
);
3303 state
->current_function
= NULL
;
3305 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3306 YYLTYPE loc
= this->get_location();
3307 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3308 "%s, but no return statement",
3309 signature
->function_name(),
3310 signature
->return_type
->name
);
3313 /* Function definitions do not have r-values.
3320 ast_jump_statement::hir(exec_list
*instructions
,
3321 struct _mesa_glsl_parse_state
*state
)
3328 assert(state
->current_function
);
3330 if (opt_return_value
) {
3331 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3333 /* The value of the return type can be NULL if the shader says
3334 * 'return foo();' and foo() is a function that returns void.
3336 * NOTE: The GLSL spec doesn't say that this is an error. The type
3337 * of the return value is void. If the return type of the function is
3338 * also void, then this should compile without error. Seriously.
3340 const glsl_type
*const ret_type
=
3341 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3343 /* Implicit conversions are not allowed for return values. */
3344 if (state
->current_function
->return_type
!= ret_type
) {
3345 YYLTYPE loc
= this->get_location();
3347 _mesa_glsl_error(& loc
, state
,
3348 "`return' with wrong type %s, in function `%s' "
3351 state
->current_function
->function_name(),
3352 state
->current_function
->return_type
->name
);
3355 inst
= new(ctx
) ir_return(ret
);
3357 if (state
->current_function
->return_type
->base_type
!=
3359 YYLTYPE loc
= this->get_location();
3361 _mesa_glsl_error(& loc
, state
,
3362 "`return' with no value, in function %s returning "
3364 state
->current_function
->function_name());
3366 inst
= new(ctx
) ir_return
;
3369 state
->found_return
= true;
3370 instructions
->push_tail(inst
);
3375 if (state
->target
!= fragment_shader
) {
3376 YYLTYPE loc
= this->get_location();
3378 _mesa_glsl_error(& loc
, state
,
3379 "`discard' may only appear in a fragment shader");
3381 instructions
->push_tail(new(ctx
) ir_discard
);
3386 if (mode
== ast_continue
&&
3387 state
->loop_nesting_ast
== NULL
) {
3388 YYLTYPE loc
= this->get_location();
3390 _mesa_glsl_error(& loc
, state
,
3391 "continue may only appear in a loop");
3392 } else if (mode
== ast_break
&&
3393 state
->loop_nesting_ast
== NULL
&&
3394 state
->switch_state
.switch_nesting_ast
== NULL
) {
3395 YYLTYPE loc
= this->get_location();
3397 _mesa_glsl_error(& loc
, state
,
3398 "break may only appear in a loop or a switch");
3400 /* For a loop, inline the for loop expression again,
3401 * since we don't know where near the end of
3402 * the loop body the normal copy of it
3403 * is going to be placed.
3405 if (state
->loop_nesting_ast
!= NULL
&&
3406 mode
== ast_continue
&&
3407 state
->loop_nesting_ast
->rest_expression
) {
3408 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3412 if (state
->switch_state
.is_switch_innermost
&&
3413 mode
== ast_break
) {
3414 /* Force break out of switch by setting is_break switch state.
3416 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3417 ir_dereference_variable
*const deref_is_break_var
=
3418 new(ctx
) ir_dereference_variable(is_break_var
);
3419 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3420 ir_assignment
*const set_break_var
=
3421 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3423 instructions
->push_tail(set_break_var
);
3426 ir_loop_jump
*const jump
=
3427 new(ctx
) ir_loop_jump((mode
== ast_break
)
3428 ? ir_loop_jump::jump_break
3429 : ir_loop_jump::jump_continue
);
3430 instructions
->push_tail(jump
);
3437 /* Jump instructions do not have r-values.
3444 ast_selection_statement::hir(exec_list
*instructions
,
3445 struct _mesa_glsl_parse_state
*state
)
3449 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3451 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3453 * "Any expression whose type evaluates to a Boolean can be used as the
3454 * conditional expression bool-expression. Vector types are not accepted
3455 * as the expression to if."
3457 * The checks are separated so that higher quality diagnostics can be
3458 * generated for cases where both rules are violated.
3460 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3461 YYLTYPE loc
= this->condition
->get_location();
3463 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3467 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3469 if (then_statement
!= NULL
) {
3470 state
->symbols
->push_scope();
3471 then_statement
->hir(& stmt
->then_instructions
, state
);
3472 state
->symbols
->pop_scope();
3475 if (else_statement
!= NULL
) {
3476 state
->symbols
->push_scope();
3477 else_statement
->hir(& stmt
->else_instructions
, state
);
3478 state
->symbols
->pop_scope();
3481 instructions
->push_tail(stmt
);
3483 /* if-statements do not have r-values.
3490 ast_switch_statement::hir(exec_list
*instructions
,
3491 struct _mesa_glsl_parse_state
*state
)
3495 ir_rvalue
*const test_expression
=
3496 this->test_expression
->hir(instructions
, state
);
3498 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3500 * "The type of init-expression in a switch statement must be a
3503 if (!test_expression
->type
->is_scalar() ||
3504 !test_expression
->type
->is_integer()) {
3505 YYLTYPE loc
= this->test_expression
->get_location();
3507 _mesa_glsl_error(& loc
,
3509 "switch-statement expression must be scalar "
3513 /* Track the switch-statement nesting in a stack-like manner.
3515 struct glsl_switch_state saved
= state
->switch_state
;
3517 state
->switch_state
.is_switch_innermost
= true;
3518 state
->switch_state
.switch_nesting_ast
= this;
3519 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3520 hash_table_pointer_compare
);
3521 state
->switch_state
.previous_default
= NULL
;
3523 /* Initalize is_fallthru state to false.
3525 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3526 state
->switch_state
.is_fallthru_var
=
3527 new(ctx
) ir_variable(glsl_type::bool_type
,
3528 "switch_is_fallthru_tmp",
3530 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3532 ir_dereference_variable
*deref_is_fallthru_var
=
3533 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3534 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3537 /* Initalize is_break state to false.
3539 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3540 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3541 "switch_is_break_tmp",
3543 instructions
->push_tail(state
->switch_state
.is_break_var
);
3545 ir_dereference_variable
*deref_is_break_var
=
3546 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3547 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3550 /* Cache test expression.
3552 test_to_hir(instructions
, state
);
3554 /* Emit code for body of switch stmt.
3556 body
->hir(instructions
, state
);
3558 hash_table_dtor(state
->switch_state
.labels_ht
);
3560 state
->switch_state
= saved
;
3562 /* Switch statements do not have r-values. */
3568 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3569 struct _mesa_glsl_parse_state
*state
)
3573 /* Cache value of test expression. */
3574 ir_rvalue
*const test_val
=
3575 test_expression
->hir(instructions
,
3578 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3581 ir_dereference_variable
*deref_test_var
=
3582 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3584 instructions
->push_tail(state
->switch_state
.test_var
);
3585 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
3590 ast_switch_body::hir(exec_list
*instructions
,
3591 struct _mesa_glsl_parse_state
*state
)
3594 stmts
->hir(instructions
, state
);
3596 /* Switch bodies do not have r-values. */
3601 ast_case_statement_list::hir(exec_list
*instructions
,
3602 struct _mesa_glsl_parse_state
*state
)
3604 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3605 case_stmt
->hir(instructions
, state
);
3607 /* Case statements do not have r-values. */
3612 ast_case_statement::hir(exec_list
*instructions
,
3613 struct _mesa_glsl_parse_state
*state
)
3615 labels
->hir(instructions
, state
);
3617 /* Conditionally set fallthru state based on break state. */
3618 ir_constant
*const false_val
= new(state
) ir_constant(false);
3619 ir_dereference_variable
*const deref_is_fallthru_var
=
3620 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3621 ir_dereference_variable
*const deref_is_break_var
=
3622 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3623 ir_assignment
*const reset_fallthru_on_break
=
3624 new(state
) ir_assignment(deref_is_fallthru_var
,
3626 deref_is_break_var
);
3627 instructions
->push_tail(reset_fallthru_on_break
);
3629 /* Guard case statements depending on fallthru state. */
3630 ir_dereference_variable
*const deref_fallthru_guard
=
3631 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3632 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3634 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3635 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3637 instructions
->push_tail(test_fallthru
);
3639 /* Case statements do not have r-values. */
3645 ast_case_label_list::hir(exec_list
*instructions
,
3646 struct _mesa_glsl_parse_state
*state
)
3648 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3649 label
->hir(instructions
, state
);
3651 /* Case labels do not have r-values. */
3656 ast_case_label::hir(exec_list
*instructions
,
3657 struct _mesa_glsl_parse_state
*state
)
3661 ir_dereference_variable
*deref_fallthru_var
=
3662 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3664 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3666 /* If not default case, ... */
3667 if (this->test_value
!= NULL
) {
3668 /* Conditionally set fallthru state based on
3669 * comparison of cached test expression value to case label.
3671 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3672 ir_constant
*label_const
= label_rval
->constant_expression_value();
3675 YYLTYPE loc
= this->test_value
->get_location();
3677 _mesa_glsl_error(& loc
, state
,
3678 "switch statement case label must be a "
3679 "constant expression");
3681 /* Stuff a dummy value in to allow processing to continue. */
3682 label_const
= new(ctx
) ir_constant(0);
3684 ast_expression
*previous_label
= (ast_expression
*)
3685 hash_table_find(state
->switch_state
.labels_ht
,
3686 (void *)(uintptr_t)label_const
->value
.u
[0]);
3688 if (previous_label
) {
3689 YYLTYPE loc
= this->test_value
->get_location();
3690 _mesa_glsl_error(& loc
, state
,
3691 "duplicate case value");
3693 loc
= previous_label
->get_location();
3694 _mesa_glsl_error(& loc
, state
,
3695 "this is the previous case label");
3697 hash_table_insert(state
->switch_state
.labels_ht
,
3699 (void *)(uintptr_t)label_const
->value
.u
[0]);
3703 ir_dereference_variable
*deref_test_var
=
3704 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3706 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3710 ir_assignment
*set_fallthru_on_test
=
3711 new(ctx
) ir_assignment(deref_fallthru_var
,
3715 instructions
->push_tail(set_fallthru_on_test
);
3716 } else { /* default case */
3717 if (state
->switch_state
.previous_default
) {
3718 YYLTYPE loc
= this->get_location();
3719 _mesa_glsl_error(& loc
, state
,
3720 "multiple default labels in one switch");
3722 loc
= state
->switch_state
.previous_default
->get_location();
3723 _mesa_glsl_error(& loc
, state
,
3724 "this is the first default label");
3726 state
->switch_state
.previous_default
= this;
3728 /* Set falltrhu state. */
3729 ir_assignment
*set_fallthru
=
3730 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
3732 instructions
->push_tail(set_fallthru
);
3735 /* Case statements do not have r-values. */
3740 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3741 struct _mesa_glsl_parse_state
*state
)
3745 if (condition
!= NULL
) {
3746 ir_rvalue
*const cond
=
3747 condition
->hir(& stmt
->body_instructions
, state
);
3750 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3751 YYLTYPE loc
= condition
->get_location();
3753 _mesa_glsl_error(& loc
, state
,
3754 "loop condition must be scalar boolean");
3756 /* As the first code in the loop body, generate a block that looks
3757 * like 'if (!condition) break;' as the loop termination condition.
3759 ir_rvalue
*const not_cond
=
3760 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
3762 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3764 ir_jump
*const break_stmt
=
3765 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3767 if_stmt
->then_instructions
.push_tail(break_stmt
);
3768 stmt
->body_instructions
.push_tail(if_stmt
);
3775 ast_iteration_statement::hir(exec_list
*instructions
,
3776 struct _mesa_glsl_parse_state
*state
)
3780 /* For-loops and while-loops start a new scope, but do-while loops do not.
3782 if (mode
!= ast_do_while
)
3783 state
->symbols
->push_scope();
3785 if (init_statement
!= NULL
)
3786 init_statement
->hir(instructions
, state
);
3788 ir_loop
*const stmt
= new(ctx
) ir_loop();
3789 instructions
->push_tail(stmt
);
3791 /* Track the current loop nesting. */
3792 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3794 state
->loop_nesting_ast
= this;
3796 /* Likewise, indicate that following code is closest to a loop,
3797 * NOT closest to a switch.
3799 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3800 state
->switch_state
.is_switch_innermost
= false;
3802 if (mode
!= ast_do_while
)
3803 condition_to_hir(stmt
, state
);
3806 body
->hir(& stmt
->body_instructions
, state
);
3808 if (rest_expression
!= NULL
)
3809 rest_expression
->hir(& stmt
->body_instructions
, state
);
3811 if (mode
== ast_do_while
)
3812 condition_to_hir(stmt
, state
);
3814 if (mode
!= ast_do_while
)
3815 state
->symbols
->pop_scope();
3817 /* Restore previous nesting before returning. */
3818 state
->loop_nesting_ast
= nesting_ast
;
3819 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3821 /* Loops do not have r-values.
3828 * Determine if the given type is valid for establishing a default precision
3831 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
3833 * "The precision statement
3835 * precision precision-qualifier type;
3837 * can be used to establish a default precision qualifier. The type field
3838 * can be either int or float or any of the sampler types, and the
3839 * precision-qualifier can be lowp, mediump, or highp."
3841 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
3842 * qualifiers on sampler types, but this seems like an oversight (since the
3843 * intention of including these in GLSL 1.30 is to allow compatibility with ES
3844 * shaders). So we allow int, float, and all sampler types regardless of GLSL
3848 is_valid_default_precision_type(const struct _mesa_glsl_parse_state
*state
,
3849 const char *type_name
)
3851 const struct glsl_type
*type
= state
->symbols
->get_type(type_name
);
3855 switch (type
->base_type
) {
3857 case GLSL_TYPE_FLOAT
:
3858 /* "int" and "float" are valid, but vectors and matrices are not. */
3859 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
3860 case GLSL_TYPE_SAMPLER
:
3869 ast_type_specifier::hir(exec_list
*instructions
,
3870 struct _mesa_glsl_parse_state
*state
)
3872 if (!this->is_precision_statement
&& this->structure
== NULL
)
3875 YYLTYPE loc
= this->get_location();
3877 if (this->precision
!= ast_precision_none
3878 && !state
->check_precision_qualifiers_allowed(&loc
)) {
3881 if (this->precision
!= ast_precision_none
3882 && this->structure
!= NULL
) {
3883 _mesa_glsl_error(&loc
, state
,
3884 "precision qualifiers do not apply to structures");
3888 /* If this is a precision statement, check that the type to which it is
3889 * applied is either float or int.
3891 * From section 4.5.3 of the GLSL 1.30 spec:
3892 * "The precision statement
3893 * precision precision-qualifier type;
3894 * can be used to establish a default precision qualifier. The type
3895 * field can be either int or float [...]. Any other types or
3896 * qualifiers will result in an error.
3898 if (this->is_precision_statement
) {
3899 assert(this->precision
!= ast_precision_none
);
3900 assert(this->structure
== NULL
); /* The check for structures was
3901 * performed above. */
3902 if (this->is_array
) {
3903 _mesa_glsl_error(&loc
, state
,
3904 "default precision statements do not apply to "
3908 if (!is_valid_default_precision_type(state
, this->type_name
)) {
3909 _mesa_glsl_error(&loc
, state
,
3910 "default precision statements apply only to types "
3911 "float, int, and sampler types");
3915 /* FINISHME: Translate precision statements into IR. */
3919 if (this->structure
!= NULL
)
3920 return this->structure
->hir(instructions
, state
);
3927 * Process a structure or interface block tree into an array of structure fields
3929 * After parsing, where there are some syntax differnces, structures and
3930 * interface blocks are almost identical. They are similar enough that the
3931 * AST for each can be processed the same way into a set of
3932 * \c glsl_struct_field to describe the members.
3935 * The number of fields processed. A pointer to the array structure fields is
3936 * stored in \c *fields_ret.
3939 ast_process_structure_or_interface_block(exec_list
*instructions
,
3940 struct _mesa_glsl_parse_state
*state
,
3941 exec_list
*declarations
,
3943 glsl_struct_field
**fields_ret
,
3945 bool block_row_major
)
3947 unsigned decl_count
= 0;
3949 /* Make an initial pass over the list of fields to determine how
3950 * many there are. Each element in this list is an ast_declarator_list.
3951 * This means that we actually need to count the number of elements in the
3952 * 'declarations' list in each of the elements.
3954 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
3955 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3960 /* Allocate storage for the fields and process the field
3961 * declarations. As the declarations are processed, try to also convert
3962 * the types to HIR. This ensures that structure definitions embedded in
3963 * other structure definitions or in interface blocks are processed.
3965 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3969 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
3970 const char *type_name
;
3972 decl_list
->type
->specifier
->hir(instructions
, state
);
3974 /* Section 10.9 of the GLSL ES 1.00 specification states that
3975 * embedded structure definitions have been removed from the language.
3977 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3978 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3979 "not allowed in GLSL ES 1.00.");
3982 const glsl_type
*decl_type
=
3983 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3985 foreach_list_typed (ast_declaration
, decl
, link
,
3986 &decl_list
->declarations
) {
3987 /* From the GL_ARB_uniform_buffer_object spec:
3989 * "Sampler types are not allowed inside of uniform
3990 * blocks. All other types, arrays, and structures
3991 * allowed for uniforms are allowed within a uniform
3994 const struct glsl_type
*field_type
= decl_type
;
3996 if (is_interface
&& field_type
->contains_sampler()) {
3997 YYLTYPE loc
= decl_list
->get_location();
3998 _mesa_glsl_error(&loc
, state
,
3999 "Uniform in non-default uniform block contains sampler\n");
4002 const struct ast_type_qualifier
*const qual
=
4003 & decl_list
->type
->qualifier
;
4004 if (qual
->flags
.q
.std140
||
4005 qual
->flags
.q
.packed
||
4006 qual
->flags
.q
.shared
) {
4007 _mesa_glsl_error(&loc
, state
,
4008 "uniform block layout qualifiers std140, packed, and "
4009 "shared can only be applied to uniform blocks, not "
4013 if (decl
->is_array
) {
4014 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4017 fields
[i
].type
= (field_type
!= NULL
)
4018 ? field_type
: glsl_type::error_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
);