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 /* If the assignment LHS comes back as an ir_binop_vector_extract
676 * expression, move it to the RHS as an ir_triop_vector_insert.
678 if (lhs
->ir_type
== ir_type_expression
) {
679 ir_expression
*const expr
= lhs
->as_expression();
681 if (unlikely(expr
->operation
== ir_binop_vector_extract
)) {
683 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
685 if (new_rhs
== NULL
) {
686 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
689 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
690 expr
->operands
[0]->type
,
694 lhs
= expr
->operands
[0]->clone(ctx
, NULL
);
699 ir_variable
*lhs_var
= lhs
->variable_referenced();
701 lhs_var
->assigned
= true;
703 if (!error_emitted
) {
704 if (non_lvalue_description
!= NULL
) {
705 _mesa_glsl_error(&lhs_loc
, state
,
707 non_lvalue_description
);
708 error_emitted
= true;
709 } else if (lhs
->variable_referenced() != NULL
710 && lhs
->variable_referenced()->read_only
) {
711 _mesa_glsl_error(&lhs_loc
, state
,
712 "assignment to read-only variable '%s'",
713 lhs
->variable_referenced()->name
);
714 error_emitted
= true;
716 } else if (lhs
->type
->is_array() &&
717 !state
->check_version(120, 300, &lhs_loc
,
718 "whole array assignment forbidden")) {
719 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
721 * "Other binary or unary expressions, non-dereferenced
722 * arrays, function names, swizzles with repeated fields,
723 * and constants cannot be l-values."
725 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
727 error_emitted
= true;
728 } else if (!lhs
->is_lvalue()) {
729 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
730 error_emitted
= true;
735 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
736 if (new_rhs
== NULL
) {
737 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
741 /* If the LHS array was not declared with a size, it takes it size from
742 * the RHS. If the LHS is an l-value and a whole array, it must be a
743 * dereference of a variable. Any other case would require that the LHS
744 * is either not an l-value or not a whole array.
746 if (lhs
->type
->array_size() == 0) {
747 ir_dereference
*const d
= lhs
->as_dereference();
751 ir_variable
*const var
= d
->variable_referenced();
755 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
756 /* FINISHME: This should actually log the location of the RHS. */
757 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
759 var
->max_array_access
);
762 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
763 rhs
->type
->array_size());
766 mark_whole_array_access(rhs
);
767 mark_whole_array_access(lhs
);
770 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
771 * but not post_inc) need the converted assigned value as an rvalue
772 * to handle things like:
776 * So we always just store the computed value being assigned to a
777 * temporary and return a deref of that temporary. If the rvalue
778 * ends up not being used, the temp will get copy-propagated out.
780 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
782 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
783 instructions
->push_tail(var
);
784 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
785 deref_var
= new(ctx
) ir_dereference_variable(var
);
788 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
790 return new(ctx
) ir_dereference_variable(var
);
794 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
796 void *ctx
= ralloc_parent(lvalue
);
799 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
801 instructions
->push_tail(var
);
802 var
->mode
= ir_var_auto
;
804 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
807 return new(ctx
) ir_dereference_variable(var
);
812 ast_node::hir(exec_list
*instructions
,
813 struct _mesa_glsl_parse_state
*state
)
822 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
825 ir_rvalue
*cmp
= NULL
;
827 if (operation
== ir_binop_all_equal
)
828 join_op
= ir_binop_logic_and
;
830 join_op
= ir_binop_logic_or
;
832 switch (op0
->type
->base_type
) {
833 case GLSL_TYPE_FLOAT
:
837 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
839 case GLSL_TYPE_ARRAY
: {
840 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
841 ir_rvalue
*e0
, *e1
, *result
;
843 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
844 new(mem_ctx
) ir_constant(i
));
845 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
846 new(mem_ctx
) ir_constant(i
));
847 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
850 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
856 mark_whole_array_access(op0
);
857 mark_whole_array_access(op1
);
861 case GLSL_TYPE_STRUCT
: {
862 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
863 ir_rvalue
*e0
, *e1
, *result
;
864 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
866 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
868 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
870 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
873 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
881 case GLSL_TYPE_ERROR
:
883 case GLSL_TYPE_SAMPLER
:
884 case GLSL_TYPE_INTERFACE
:
885 /* I assume a comparison of a struct containing a sampler just
886 * ignores the sampler present in the type.
892 cmp
= new(mem_ctx
) ir_constant(true);
897 /* For logical operations, we want to ensure that the operands are
898 * scalar booleans. If it isn't, emit an error and return a constant
899 * boolean to avoid triggering cascading error messages.
902 get_scalar_boolean_operand(exec_list
*instructions
,
903 struct _mesa_glsl_parse_state
*state
,
904 ast_expression
*parent_expr
,
906 const char *operand_name
,
909 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
911 ir_rvalue
*val
= expr
->hir(instructions
, state
);
913 if (val
->type
->is_boolean() && val
->type
->is_scalar())
916 if (!*error_emitted
) {
917 YYLTYPE loc
= expr
->get_location();
918 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
920 parent_expr
->operator_string(parent_expr
->oper
));
921 *error_emitted
= true;
924 return new(ctx
) ir_constant(true);
928 * If name refers to a builtin array whose maximum allowed size is less than
929 * size, report an error and return true. Otherwise return false.
932 check_builtin_array_max_size(const char *name
, unsigned size
,
933 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
935 if ((strcmp("gl_TexCoord", name
) == 0)
936 && (size
> state
->Const
.MaxTextureCoords
)) {
937 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
939 * "The size [of gl_TexCoord] can be at most
940 * gl_MaxTextureCoords."
942 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
943 "be larger than gl_MaxTextureCoords (%u)\n",
944 state
->Const
.MaxTextureCoords
);
945 } else if (strcmp("gl_ClipDistance", name
) == 0
946 && size
> state
->Const
.MaxClipPlanes
) {
947 /* From section 7.1 (Vertex Shader Special Variables) of the
950 * "The gl_ClipDistance array is predeclared as unsized and
951 * must be sized by the shader either redeclaring it with a
952 * size or indexing it only with integral constant
953 * expressions. ... The size can be at most
954 * gl_MaxClipDistances."
956 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
957 "be larger than gl_MaxClipDistances (%u)\n",
958 state
->Const
.MaxClipPlanes
);
963 * Create the constant 1, of a which is appropriate for incrementing and
964 * decrementing values of the given GLSL type. For example, if type is vec4,
965 * this creates a constant value of 1.0 having type float.
967 * If the given type is invalid for increment and decrement operators, return
968 * a floating point 1--the error will be detected later.
971 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
973 switch (type
->base_type
) {
975 return new(ctx
) ir_constant((unsigned) 1);
977 return new(ctx
) ir_constant(1);
979 case GLSL_TYPE_FLOAT
:
980 return new(ctx
) ir_constant(1.0f
);
985 ast_expression::hir(exec_list
*instructions
,
986 struct _mesa_glsl_parse_state
*state
)
989 static const int operations
[AST_NUM_OPERATORS
] = {
990 -1, /* ast_assign doesn't convert to ir_expression. */
991 -1, /* ast_plus doesn't convert to ir_expression. */
1005 ir_binop_any_nequal
,
1015 /* Note: The following block of expression types actually convert
1016 * to multiple IR instructions.
1018 ir_binop_mul
, /* ast_mul_assign */
1019 ir_binop_div
, /* ast_div_assign */
1020 ir_binop_mod
, /* ast_mod_assign */
1021 ir_binop_add
, /* ast_add_assign */
1022 ir_binop_sub
, /* ast_sub_assign */
1023 ir_binop_lshift
, /* ast_ls_assign */
1024 ir_binop_rshift
, /* ast_rs_assign */
1025 ir_binop_bit_and
, /* ast_and_assign */
1026 ir_binop_bit_xor
, /* ast_xor_assign */
1027 ir_binop_bit_or
, /* ast_or_assign */
1029 -1, /* ast_conditional doesn't convert to ir_expression. */
1030 ir_binop_add
, /* ast_pre_inc. */
1031 ir_binop_sub
, /* ast_pre_dec. */
1032 ir_binop_add
, /* ast_post_inc. */
1033 ir_binop_sub
, /* ast_post_dec. */
1034 -1, /* ast_field_selection doesn't conv to ir_expression. */
1035 -1, /* ast_array_index doesn't convert to ir_expression. */
1036 -1, /* ast_function_call doesn't conv to ir_expression. */
1037 -1, /* ast_identifier doesn't convert to ir_expression. */
1038 -1, /* ast_int_constant doesn't convert to ir_expression. */
1039 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1040 -1, /* ast_float_constant doesn't conv to ir_expression. */
1041 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1042 -1, /* ast_sequence doesn't convert to ir_expression. */
1044 ir_rvalue
*result
= NULL
;
1046 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1047 bool error_emitted
= false;
1050 loc
= this->get_location();
1052 switch (this->oper
) {
1054 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1055 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1057 result
= do_assignment(instructions
, state
,
1058 this->subexpressions
[0]->non_lvalue_description
,
1059 op
[0], op
[1], false,
1060 this->subexpressions
[0]->get_location());
1061 error_emitted
= result
->type
->is_error();
1066 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1068 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1070 error_emitted
= type
->is_error();
1076 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1078 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1080 error_emitted
= type
->is_error();
1082 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1090 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1091 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1093 type
= arithmetic_result_type(op
[0], op
[1],
1094 (this->oper
== ast_mul
),
1096 error_emitted
= type
->is_error();
1098 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1103 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1104 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1106 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1108 assert(operations
[this->oper
] == ir_binop_mod
);
1110 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1112 error_emitted
= type
->is_error();
1117 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1118 error_emitted
= true;
1121 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1122 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1123 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1125 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1127 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1134 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1135 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1137 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1139 /* The relational operators must either generate an error or result
1140 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1142 assert(type
->is_error()
1143 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1144 && type
->is_scalar()));
1146 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1148 error_emitted
= type
->is_error();
1153 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1154 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1156 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1158 * "The equality operators equal (==), and not equal (!=)
1159 * operate on all types. They result in a scalar Boolean. If
1160 * the operand types do not match, then there must be a
1161 * conversion from Section 4.1.10 "Implicit Conversions"
1162 * applied to one operand that can make them match, in which
1163 * case this conversion is done."
1165 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1166 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1167 || (op
[0]->type
!= op
[1]->type
)) {
1168 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1169 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1170 error_emitted
= true;
1171 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1172 !state
->check_version(120, 300, &loc
,
1173 "array comparisons forbidden")) {
1174 error_emitted
= true;
1177 if (error_emitted
) {
1178 result
= new(ctx
) ir_constant(false);
1180 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1181 assert(result
->type
== glsl_type::bool_type
);
1188 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1189 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1190 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1192 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1194 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1198 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1200 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1201 error_emitted
= true;
1204 if (!op
[0]->type
->is_integer()) {
1205 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1206 error_emitted
= true;
1209 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1210 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1213 case ast_logic_and
: {
1214 exec_list rhs_instructions
;
1215 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1216 "LHS", &error_emitted
);
1217 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1218 "RHS", &error_emitted
);
1220 if (rhs_instructions
.is_empty()) {
1221 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1222 type
= result
->type
;
1224 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1227 instructions
->push_tail(tmp
);
1229 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1230 instructions
->push_tail(stmt
);
1232 stmt
->then_instructions
.append_list(&rhs_instructions
);
1233 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1234 ir_assignment
*const then_assign
=
1235 new(ctx
) ir_assignment(then_deref
, op
[1]);
1236 stmt
->then_instructions
.push_tail(then_assign
);
1238 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1239 ir_assignment
*const else_assign
=
1240 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1241 stmt
->else_instructions
.push_tail(else_assign
);
1243 result
= new(ctx
) ir_dereference_variable(tmp
);
1249 case ast_logic_or
: {
1250 exec_list rhs_instructions
;
1251 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1252 "LHS", &error_emitted
);
1253 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1254 "RHS", &error_emitted
);
1256 if (rhs_instructions
.is_empty()) {
1257 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1258 type
= result
->type
;
1260 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1263 instructions
->push_tail(tmp
);
1265 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1266 instructions
->push_tail(stmt
);
1268 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1269 ir_assignment
*const then_assign
=
1270 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1271 stmt
->then_instructions
.push_tail(then_assign
);
1273 stmt
->else_instructions
.append_list(&rhs_instructions
);
1274 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1275 ir_assignment
*const else_assign
=
1276 new(ctx
) ir_assignment(else_deref
, op
[1]);
1277 stmt
->else_instructions
.push_tail(else_assign
);
1279 result
= new(ctx
) ir_dereference_variable(tmp
);
1286 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1288 * "The logical binary operators and (&&), or ( | | ), and
1289 * exclusive or (^^). They operate only on two Boolean
1290 * expressions and result in a Boolean expression."
1292 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1294 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1297 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1302 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1303 "operand", &error_emitted
);
1305 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1309 case ast_mul_assign
:
1310 case ast_div_assign
:
1311 case ast_add_assign
:
1312 case ast_sub_assign
: {
1313 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1314 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1316 type
= arithmetic_result_type(op
[0], op
[1],
1317 (this->oper
== ast_mul_assign
),
1320 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1323 result
= do_assignment(instructions
, state
,
1324 this->subexpressions
[0]->non_lvalue_description
,
1325 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1326 this->subexpressions
[0]->get_location());
1327 error_emitted
= (op
[0]->type
->is_error());
1329 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1330 * explicitly test for this because none of the binary expression
1331 * operators allow array operands either.
1337 case ast_mod_assign
: {
1338 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1339 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1341 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1343 assert(operations
[this->oper
] == ir_binop_mod
);
1345 ir_rvalue
*temp_rhs
;
1346 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1349 result
= do_assignment(instructions
, state
,
1350 this->subexpressions
[0]->non_lvalue_description
,
1351 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1352 this->subexpressions
[0]->get_location());
1353 error_emitted
= type
->is_error();
1358 case ast_rs_assign
: {
1359 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1360 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1361 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1363 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1364 type
, op
[0], op
[1]);
1365 result
= do_assignment(instructions
, state
,
1366 this->subexpressions
[0]->non_lvalue_description
,
1367 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1368 this->subexpressions
[0]->get_location());
1369 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1373 case ast_and_assign
:
1374 case ast_xor_assign
:
1375 case ast_or_assign
: {
1376 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1377 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1378 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1380 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1381 type
, op
[0], op
[1]);
1382 result
= do_assignment(instructions
, state
,
1383 this->subexpressions
[0]->non_lvalue_description
,
1384 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1385 this->subexpressions
[0]->get_location());
1386 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1390 case ast_conditional
: {
1391 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1393 * "The ternary selection operator (?:). It operates on three
1394 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1395 * first expression, which must result in a scalar Boolean."
1397 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1398 "condition", &error_emitted
);
1400 /* The :? operator is implemented by generating an anonymous temporary
1401 * followed by an if-statement. The last instruction in each branch of
1402 * the if-statement assigns a value to the anonymous temporary. This
1403 * temporary is the r-value of the expression.
1405 exec_list then_instructions
;
1406 exec_list else_instructions
;
1408 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1409 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1411 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1413 * "The second and third expressions can be any type, as
1414 * long their types match, or there is a conversion in
1415 * Section 4.1.10 "Implicit Conversions" that can be applied
1416 * to one of the expressions to make their types match. This
1417 * resulting matching type is the type of the entire
1420 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1421 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1422 || (op
[1]->type
!= op
[2]->type
)) {
1423 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1425 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1426 "operator must have matching types.");
1427 error_emitted
= true;
1428 type
= glsl_type::error_type
;
1433 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1435 * "The second and third expressions must be the same type, but can
1436 * be of any type other than an array."
1438 if (type
->is_array() &&
1439 !state
->check_version(120, 300, &loc
,
1440 "Second and third operands of ?: operator "
1441 "cannot be arrays")) {
1442 error_emitted
= true;
1445 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1446 ir_constant
*then_val
= op
[1]->constant_expression_value();
1447 ir_constant
*else_val
= op
[2]->constant_expression_value();
1449 if (then_instructions
.is_empty()
1450 && else_instructions
.is_empty()
1451 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1452 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1454 ir_variable
*const tmp
=
1455 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1456 instructions
->push_tail(tmp
);
1458 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1459 instructions
->push_tail(stmt
);
1461 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1462 ir_dereference
*const then_deref
=
1463 new(ctx
) ir_dereference_variable(tmp
);
1464 ir_assignment
*const then_assign
=
1465 new(ctx
) ir_assignment(then_deref
, op
[1]);
1466 stmt
->then_instructions
.push_tail(then_assign
);
1468 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1469 ir_dereference
*const else_deref
=
1470 new(ctx
) ir_dereference_variable(tmp
);
1471 ir_assignment
*const else_assign
=
1472 new(ctx
) ir_assignment(else_deref
, op
[2]);
1473 stmt
->else_instructions
.push_tail(else_assign
);
1475 result
= new(ctx
) ir_dereference_variable(tmp
);
1482 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1483 ? "pre-increment operation" : "pre-decrement operation";
1485 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1486 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1488 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1490 ir_rvalue
*temp_rhs
;
1491 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1494 result
= do_assignment(instructions
, state
,
1495 this->subexpressions
[0]->non_lvalue_description
,
1496 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1497 this->subexpressions
[0]->get_location());
1498 error_emitted
= op
[0]->type
->is_error();
1503 case ast_post_dec
: {
1504 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1505 ? "post-increment operation" : "post-decrement operation";
1506 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1507 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1509 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1511 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1513 ir_rvalue
*temp_rhs
;
1514 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1517 /* Get a temporary of a copy of the lvalue before it's modified.
1518 * This may get thrown away later.
1520 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1522 (void)do_assignment(instructions
, state
,
1523 this->subexpressions
[0]->non_lvalue_description
,
1524 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1525 this->subexpressions
[0]->get_location());
1527 error_emitted
= op
[0]->type
->is_error();
1531 case ast_field_selection
:
1532 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1535 case ast_array_index
: {
1536 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1538 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1539 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1541 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1544 if (result
->type
->is_error())
1545 error_emitted
= true;
1550 case ast_function_call
:
1551 /* Should *NEVER* get here. ast_function_call should always be handled
1552 * by ast_function_expression::hir.
1557 case ast_identifier
: {
1558 /* ast_identifier can appear several places in a full abstract syntax
1559 * tree. This particular use must be at location specified in the grammar
1560 * as 'variable_identifier'.
1563 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1567 result
= new(ctx
) ir_dereference_variable(var
);
1569 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1570 this->primary_expression
.identifier
);
1572 result
= ir_rvalue::error_value(ctx
);
1573 error_emitted
= true;
1578 case ast_int_constant
:
1579 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1582 case ast_uint_constant
:
1583 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1586 case ast_float_constant
:
1587 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1590 case ast_bool_constant
:
1591 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1594 case ast_sequence
: {
1595 /* It should not be possible to generate a sequence in the AST without
1596 * any expressions in it.
1598 assert(!this->expressions
.is_empty());
1600 /* The r-value of a sequence is the last expression in the sequence. If
1601 * the other expressions in the sequence do not have side-effects (and
1602 * therefore add instructions to the instruction list), they get dropped
1605 exec_node
*previous_tail_pred
= NULL
;
1606 YYLTYPE previous_operand_loc
= loc
;
1608 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1609 /* If one of the operands of comma operator does not generate any
1610 * code, we want to emit a warning. At each pass through the loop
1611 * previous_tail_pred will point to the last instruction in the
1612 * stream *before* processing the previous operand. Naturally,
1613 * instructions->tail_pred will point to the last instruction in the
1614 * stream *after* processing the previous operand. If the two
1615 * pointers match, then the previous operand had no effect.
1617 * The warning behavior here differs slightly from GCC. GCC will
1618 * only emit a warning if none of the left-hand operands have an
1619 * effect. However, it will emit a warning for each. I believe that
1620 * there are some cases in C (especially with GCC extensions) where
1621 * it is useful to have an intermediate step in a sequence have no
1622 * effect, but I don't think these cases exist in GLSL. Either way,
1623 * it would be a giant hassle to replicate that behavior.
1625 if (previous_tail_pred
== instructions
->tail_pred
) {
1626 _mesa_glsl_warning(&previous_operand_loc
, state
,
1627 "left-hand operand of comma expression has "
1631 /* tail_pred is directly accessed instead of using the get_tail()
1632 * method for performance reasons. get_tail() has extra code to
1633 * return NULL when the list is empty. We don't care about that
1634 * here, so using tail_pred directly is fine.
1636 previous_tail_pred
= instructions
->tail_pred
;
1637 previous_operand_loc
= ast
->get_location();
1639 result
= ast
->hir(instructions
, state
);
1642 /* Any errors should have already been emitted in the loop above.
1644 error_emitted
= true;
1648 type
= NULL
; /* use result->type, not type. */
1649 assert(result
!= NULL
);
1651 if (result
->type
->is_error() && !error_emitted
)
1652 _mesa_glsl_error(& loc
, state
, "type mismatch");
1659 ast_expression_statement::hir(exec_list
*instructions
,
1660 struct _mesa_glsl_parse_state
*state
)
1662 /* It is possible to have expression statements that don't have an
1663 * expression. This is the solitary semicolon:
1665 * for (i = 0; i < 5; i++)
1668 * In this case the expression will be NULL. Test for NULL and don't do
1669 * anything in that case.
1671 if (expression
!= NULL
)
1672 expression
->hir(instructions
, state
);
1674 /* Statements do not have r-values.
1681 ast_compound_statement::hir(exec_list
*instructions
,
1682 struct _mesa_glsl_parse_state
*state
)
1685 state
->symbols
->push_scope();
1687 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1688 ast
->hir(instructions
, state
);
1691 state
->symbols
->pop_scope();
1693 /* Compound statements do not have r-values.
1699 static const glsl_type
*
1700 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1701 struct _mesa_glsl_parse_state
*state
)
1703 unsigned length
= 0;
1706 return glsl_type::error_type
;
1708 /* From page 19 (page 25) of the GLSL 1.20 spec:
1710 * "Only one-dimensional arrays may be declared."
1712 if (base
->is_array()) {
1713 _mesa_glsl_error(loc
, state
,
1714 "invalid array of `%s' (only one-dimensional arrays "
1717 return glsl_type::error_type
;
1720 if (array_size
!= NULL
) {
1721 exec_list dummy_instructions
;
1722 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1723 YYLTYPE loc
= array_size
->get_location();
1726 if (!ir
->type
->is_integer()) {
1727 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1728 } else if (!ir
->type
->is_scalar()) {
1729 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1731 ir_constant
*const size
= ir
->constant_expression_value();
1734 _mesa_glsl_error(& loc
, state
, "array size must be a "
1735 "constant valued expression");
1736 } else if (size
->value
.i
[0] <= 0) {
1737 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1739 assert(size
->type
== ir
->type
);
1740 length
= size
->value
.u
[0];
1742 /* If the array size is const (and we've verified that
1743 * it is) then no instructions should have been emitted
1744 * when we converted it to HIR. If they were emitted,
1745 * then either the array size isn't const after all, or
1746 * we are emitting unnecessary instructions.
1748 assert(dummy_instructions
.is_empty());
1752 } else if (state
->es_shader
) {
1753 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1754 * array declarations have been removed from the language.
1756 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1757 "allowed in GLSL ES 1.00.");
1760 const glsl_type
*array_type
= glsl_type::get_array_instance(base
, length
);
1761 return array_type
!= NULL
? array_type
: glsl_type::error_type
;
1766 ast_type_specifier::glsl_type(const char **name
,
1767 struct _mesa_glsl_parse_state
*state
) const
1769 const struct glsl_type
*type
;
1771 type
= state
->symbols
->get_type(this->type_name
);
1772 *name
= this->type_name
;
1774 if (this->is_array
) {
1775 YYLTYPE loc
= this->get_location();
1776 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1784 * Determine whether a toplevel variable declaration declares a varying. This
1785 * function operates by examining the variable's mode and the shader target,
1786 * so it correctly identifies linkage variables regardless of whether they are
1787 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1789 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1790 * this function will produce undefined results.
1793 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1797 return var
->mode
== ir_var_shader_out
;
1798 case fragment_shader
:
1799 return var
->mode
== ir_var_shader_in
;
1801 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1807 * Matrix layout qualifiers are only allowed on certain types
1810 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1812 const glsl_type
*type
)
1814 if (!type
->is_matrix() && !type
->is_record()) {
1815 _mesa_glsl_error(loc
, state
,
1816 "uniform block layout qualifiers row_major and "
1817 "column_major can only be applied to matrix and "
1819 } else if (type
->is_record()) {
1820 /* We allow 'layout(row_major)' on structure types because it's the only
1821 * way to get row-major layouts on matrices contained in structures.
1823 _mesa_glsl_warning(loc
, state
,
1824 "uniform block layout qualifiers row_major and "
1825 "column_major applied to structure types is not "
1826 "strictly conformant and my be rejected by other "
1832 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1834 struct _mesa_glsl_parse_state
*state
,
1836 bool ubo_qualifiers_valid
,
1839 if (qual
->flags
.q
.invariant
) {
1841 _mesa_glsl_error(loc
, state
,
1842 "variable `%s' may not be redeclared "
1843 "`invariant' after being used",
1850 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1851 || qual
->flags
.q
.uniform
1852 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1855 if (qual
->flags
.q
.centroid
)
1858 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1859 var
->type
= glsl_type::error_type
;
1860 _mesa_glsl_error(loc
, state
,
1861 "`attribute' variables may not be declared in the "
1863 _mesa_glsl_shader_target_name(state
->target
));
1866 /* If there is no qualifier that changes the mode of the variable, leave
1867 * the setting alone.
1869 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1870 var
->mode
= ir_var_function_inout
;
1871 else if (qual
->flags
.q
.in
)
1872 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
1873 else if (qual
->flags
.q
.attribute
1874 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1875 var
->mode
= ir_var_shader_in
;
1876 else if (qual
->flags
.q
.out
)
1877 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
1878 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
1879 var
->mode
= ir_var_shader_out
;
1880 else if (qual
->flags
.q
.uniform
)
1881 var
->mode
= ir_var_uniform
;
1883 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
1884 /* This variable is being used to link data between shader stages (in
1885 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
1886 * that is allowed for such purposes.
1888 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1890 * "The varying qualifier can be used only with the data types
1891 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1894 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
1895 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
1897 * "Fragment inputs can only be signed and unsigned integers and
1898 * integer vectors, float, floating-point vectors, matrices, or
1899 * arrays of these. Structures cannot be input.
1901 * Similar text exists in the section on vertex shader outputs.
1903 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
1904 * 3.00 spec allows structs as well. Varying structs are also allowed
1907 switch (var
->type
->get_scalar_type()->base_type
) {
1908 case GLSL_TYPE_FLOAT
:
1909 /* Ok in all GLSL versions */
1911 case GLSL_TYPE_UINT
:
1913 if (state
->is_version(130, 300))
1915 _mesa_glsl_error(loc
, state
,
1916 "varying variables must be of base type float in %s",
1917 state
->get_version_string());
1919 case GLSL_TYPE_STRUCT
:
1920 if (state
->is_version(150, 300))
1922 _mesa_glsl_error(loc
, state
,
1923 "varying variables may not be of type struct");
1926 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
1931 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1932 switch (state
->target
) {
1934 if (var
->mode
== ir_var_shader_out
)
1935 var
->invariant
= true;
1937 case geometry_shader
:
1938 if ((var
->mode
== ir_var_shader_in
)
1939 || (var
->mode
== ir_var_shader_out
))
1940 var
->invariant
= true;
1942 case fragment_shader
:
1943 if (var
->mode
== ir_var_shader_in
)
1944 var
->invariant
= true;
1949 if (qual
->flags
.q
.flat
)
1950 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
1951 else if (qual
->flags
.q
.noperspective
)
1952 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
1953 else if (qual
->flags
.q
.smooth
)
1954 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
1956 var
->interpolation
= INTERP_QUALIFIER_NONE
;
1958 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
1959 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
) &&
1960 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)) {
1961 _mesa_glsl_error(loc
, state
,
1962 "interpolation qualifier `%s' can only be applied to "
1963 "vertex shader outputs and fragment shader inputs.",
1964 var
->interpolation_string());
1967 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1968 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1969 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1970 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1971 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1972 ? "origin_upper_left" : "pixel_center_integer";
1974 _mesa_glsl_error(loc
, state
,
1975 "layout qualifier `%s' can only be applied to "
1976 "fragment shader input `gl_FragCoord'",
1980 if (qual
->flags
.q
.explicit_location
) {
1981 const bool global_scope
= (state
->current_function
== NULL
);
1983 const char *string
= "";
1985 /* In the vertex shader only shader inputs can be given explicit
1988 * In the fragment shader only shader outputs can be given explicit
1991 switch (state
->target
) {
1993 if (!global_scope
|| (var
->mode
!= ir_var_shader_in
)) {
1999 case geometry_shader
:
2000 _mesa_glsl_error(loc
, state
,
2001 "geometry shader variables cannot be given "
2002 "explicit locations\n");
2005 case fragment_shader
:
2006 if (!global_scope
|| (var
->mode
!= ir_var_shader_out
)) {
2014 _mesa_glsl_error(loc
, state
,
2015 "only %s shader %s variables can be given an "
2016 "explicit location\n",
2017 _mesa_glsl_shader_target_name(state
->target
),
2020 var
->explicit_location
= true;
2022 /* This bit of silliness is needed because invalid explicit locations
2023 * are supposed to be flagged during linking. Small negative values
2024 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2025 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2026 * The linker needs to be able to differentiate these cases. This
2027 * ensures that negative values stay negative.
2029 if (qual
->location
>= 0) {
2030 var
->location
= (state
->target
== vertex_shader
)
2031 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2032 : (qual
->location
+ FRAG_RESULT_DATA0
);
2034 var
->location
= qual
->location
;
2037 if (qual
->flags
.q
.explicit_index
) {
2038 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2039 * Layout Qualifiers):
2041 * "It is also a compile-time error if a fragment shader
2042 * sets a layout index to less than 0 or greater than 1."
2044 * Older specifications don't mandate a behavior; we take
2045 * this as a clarification and always generate the error.
2047 if (qual
->index
< 0 || qual
->index
> 1) {
2048 _mesa_glsl_error(loc
, state
,
2049 "explicit index may only be 0 or 1\n");
2051 var
->explicit_index
= true;
2052 var
->index
= qual
->index
;
2056 } else if (qual
->flags
.q
.explicit_index
) {
2057 _mesa_glsl_error(loc
, state
,
2058 "explicit index requires explicit location\n");
2061 /* Does the declaration use the 'layout' keyword?
2063 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2064 || qual
->flags
.q
.origin_upper_left
2065 || qual
->flags
.q
.explicit_location
; /* no need for index since it relies on location */
2067 /* Does the declaration use the deprecated 'attribute' or 'varying'
2070 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2071 || qual
->flags
.q
.varying
;
2073 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2074 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2075 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2076 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2077 * These extensions and all following extensions that add the 'layout'
2078 * keyword have been modified to require the use of 'in' or 'out'.
2080 * The following extension do not allow the deprecated keywords:
2082 * GL_AMD_conservative_depth
2083 * GL_ARB_conservative_depth
2084 * GL_ARB_gpu_shader5
2085 * GL_ARB_separate_shader_objects
2086 * GL_ARB_tesselation_shader
2087 * GL_ARB_transform_feedback3
2088 * GL_ARB_uniform_buffer_object
2090 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2091 * allow layout with the deprecated keywords.
2093 const bool relaxed_layout_qualifier_checking
=
2094 state
->ARB_fragment_coord_conventions_enable
;
2096 if (uses_layout
&& uses_deprecated_qualifier
) {
2097 if (relaxed_layout_qualifier_checking
) {
2098 _mesa_glsl_warning(loc
, state
,
2099 "`layout' qualifier may not be used with "
2100 "`attribute' or `varying'");
2102 _mesa_glsl_error(loc
, state
,
2103 "`layout' qualifier may not be used with "
2104 "`attribute' or `varying'");
2108 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2109 * AMD_conservative_depth.
2111 int depth_layout_count
= qual
->flags
.q
.depth_any
2112 + qual
->flags
.q
.depth_greater
2113 + qual
->flags
.q
.depth_less
2114 + qual
->flags
.q
.depth_unchanged
;
2115 if (depth_layout_count
> 0
2116 && !state
->AMD_conservative_depth_enable
2117 && !state
->ARB_conservative_depth_enable
) {
2118 _mesa_glsl_error(loc
, state
,
2119 "extension GL_AMD_conservative_depth or "
2120 "GL_ARB_conservative_depth must be enabled "
2121 "to use depth layout qualifiers");
2122 } else if (depth_layout_count
> 0
2123 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2124 _mesa_glsl_error(loc
, state
,
2125 "depth layout qualifiers can be applied only to "
2127 } else if (depth_layout_count
> 1
2128 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2129 _mesa_glsl_error(loc
, state
,
2130 "at most one depth layout qualifier can be applied to "
2133 if (qual
->flags
.q
.depth_any
)
2134 var
->depth_layout
= ir_depth_layout_any
;
2135 else if (qual
->flags
.q
.depth_greater
)
2136 var
->depth_layout
= ir_depth_layout_greater
;
2137 else if (qual
->flags
.q
.depth_less
)
2138 var
->depth_layout
= ir_depth_layout_less
;
2139 else if (qual
->flags
.q
.depth_unchanged
)
2140 var
->depth_layout
= ir_depth_layout_unchanged
;
2142 var
->depth_layout
= ir_depth_layout_none
;
2144 if (qual
->flags
.q
.std140
||
2145 qual
->flags
.q
.packed
||
2146 qual
->flags
.q
.shared
) {
2147 _mesa_glsl_error(loc
, state
,
2148 "uniform block layout qualifiers std140, packed, and "
2149 "shared can only be applied to uniform blocks, not "
2153 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2154 if (!ubo_qualifiers_valid
) {
2155 _mesa_glsl_error(loc
, state
,
2156 "uniform block layout qualifiers row_major and "
2157 "column_major can only be applied to uniform block "
2160 validate_matrix_layout_for_type(state
, loc
, var
->type
);
2165 * Get the variable that is being redeclared by this declaration
2167 * Semantic checks to verify the validity of the redeclaration are also
2168 * performed. If semantic checks fail, compilation error will be emitted via
2169 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2172 * A pointer to an existing variable in the current scope if the declaration
2173 * is a redeclaration, \c NULL otherwise.
2176 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2177 struct _mesa_glsl_parse_state
*state
)
2179 /* Check if this declaration is actually a re-declaration, either to
2180 * resize an array or add qualifiers to an existing variable.
2182 * This is allowed for variables in the current scope, or when at
2183 * global scope (for built-ins in the implicit outer scope).
2185 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2186 if (earlier
== NULL
||
2187 (state
->current_function
!= NULL
&&
2188 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2193 YYLTYPE loc
= decl
->get_location();
2195 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2197 * "It is legal to declare an array without a size and then
2198 * later re-declare the same name as an array of the same
2199 * type and specify a size."
2201 if ((earlier
->type
->array_size() == 0)
2202 && var
->type
->is_array()
2203 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2204 /* FINISHME: This doesn't match the qualifiers on the two
2205 * FINISHME: declarations. It's not 100% clear whether this is
2206 * FINISHME: required or not.
2209 const unsigned size
= unsigned(var
->type
->array_size());
2210 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2211 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2212 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2214 earlier
->max_array_access
);
2217 earlier
->type
= var
->type
;
2220 } else if (state
->ARB_fragment_coord_conventions_enable
2221 && strcmp(var
->name
, "gl_FragCoord") == 0
2222 && earlier
->type
== var
->type
2223 && earlier
->mode
== var
->mode
) {
2224 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2227 earlier
->origin_upper_left
= var
->origin_upper_left
;
2228 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2230 /* According to section 4.3.7 of the GLSL 1.30 spec,
2231 * the following built-in varaibles can be redeclared with an
2232 * interpolation qualifier:
2235 * * gl_FrontSecondaryColor
2236 * * gl_BackSecondaryColor
2238 * * gl_SecondaryColor
2240 } else if (state
->is_version(130, 0)
2241 && (strcmp(var
->name
, "gl_FrontColor") == 0
2242 || strcmp(var
->name
, "gl_BackColor") == 0
2243 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2244 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2245 || strcmp(var
->name
, "gl_Color") == 0
2246 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2247 && earlier
->type
== var
->type
2248 && earlier
->mode
== var
->mode
) {
2249 earlier
->interpolation
= var
->interpolation
;
2251 /* Layout qualifiers for gl_FragDepth. */
2252 } else if ((state
->AMD_conservative_depth_enable
||
2253 state
->ARB_conservative_depth_enable
)
2254 && strcmp(var
->name
, "gl_FragDepth") == 0
2255 && earlier
->type
== var
->type
2256 && earlier
->mode
== var
->mode
) {
2258 /** From the AMD_conservative_depth spec:
2259 * Within any shader, the first redeclarations of gl_FragDepth
2260 * must appear before any use of gl_FragDepth.
2262 if (earlier
->used
) {
2263 _mesa_glsl_error(&loc
, state
,
2264 "the first redeclaration of gl_FragDepth "
2265 "must appear before any use of gl_FragDepth");
2268 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2269 if (earlier
->depth_layout
!= ir_depth_layout_none
2270 && earlier
->depth_layout
!= var
->depth_layout
) {
2271 _mesa_glsl_error(&loc
, state
,
2272 "gl_FragDepth: depth layout is declared here "
2273 "as '%s, but it was previously declared as "
2275 depth_layout_string(var
->depth_layout
),
2276 depth_layout_string(earlier
->depth_layout
));
2279 earlier
->depth_layout
= var
->depth_layout
;
2282 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2289 * Generate the IR for an initializer in a variable declaration
2292 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2293 ast_fully_specified_type
*type
,
2294 exec_list
*initializer_instructions
,
2295 struct _mesa_glsl_parse_state
*state
)
2297 ir_rvalue
*result
= NULL
;
2299 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2301 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2303 * "All uniform variables are read-only and are initialized either
2304 * directly by an application via API commands, or indirectly by
2307 if (var
->mode
== ir_var_uniform
) {
2308 state
->check_version(120, 0, &initializer_loc
,
2309 "cannot initialize uniforms");
2312 if (var
->type
->is_sampler()) {
2313 _mesa_glsl_error(& initializer_loc
, state
,
2314 "cannot initialize samplers");
2317 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2318 _mesa_glsl_error(& initializer_loc
, state
,
2319 "cannot initialize %s shader input / %s",
2320 _mesa_glsl_shader_target_name(state
->target
),
2321 (state
->target
== vertex_shader
)
2322 ? "attribute" : "varying");
2325 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2326 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2329 /* Calculate the constant value if this is a const or uniform
2332 if (type
->qualifier
.flags
.q
.constant
2333 || type
->qualifier
.flags
.q
.uniform
) {
2334 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2335 if (new_rhs
!= NULL
) {
2338 ir_constant
*constant_value
= rhs
->constant_expression_value();
2339 if (!constant_value
) {
2340 _mesa_glsl_error(& initializer_loc
, state
,
2341 "initializer of %s variable `%s' must be a "
2342 "constant expression",
2343 (type
->qualifier
.flags
.q
.constant
)
2344 ? "const" : "uniform",
2346 if (var
->type
->is_numeric()) {
2347 /* Reduce cascading errors. */
2348 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2351 rhs
= constant_value
;
2352 var
->constant_value
= constant_value
;
2355 _mesa_glsl_error(&initializer_loc
, state
,
2356 "initializer of type %s cannot be assigned to "
2357 "variable of type %s",
2358 rhs
->type
->name
, var
->type
->name
);
2359 if (var
->type
->is_numeric()) {
2360 /* Reduce cascading errors. */
2361 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2366 if (rhs
&& !rhs
->type
->is_error()) {
2367 bool temp
= var
->read_only
;
2368 if (type
->qualifier
.flags
.q
.constant
)
2369 var
->read_only
= false;
2371 /* Never emit code to initialize a uniform.
2373 const glsl_type
*initializer_type
;
2374 if (!type
->qualifier
.flags
.q
.uniform
) {
2375 result
= do_assignment(initializer_instructions
, state
,
2378 type
->get_location());
2379 initializer_type
= result
->type
;
2381 initializer_type
= rhs
->type
;
2383 var
->constant_initializer
= rhs
->constant_expression_value();
2384 var
->has_initializer
= true;
2386 /* If the declared variable is an unsized array, it must inherrit
2387 * its full type from the initializer. A declaration such as
2389 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2393 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2395 * The assignment generated in the if-statement (below) will also
2396 * automatically handle this case for non-uniforms.
2398 * If the declared variable is not an array, the types must
2399 * already match exactly. As a result, the type assignment
2400 * here can be done unconditionally. For non-uniforms the call
2401 * to do_assignment can change the type of the initializer (via
2402 * the implicit conversion rules). For uniforms the initializer
2403 * must be a constant expression, and the type of that expression
2404 * was validated above.
2406 var
->type
= initializer_type
;
2408 var
->read_only
= temp
;
2415 ast_declarator_list::hir(exec_list
*instructions
,
2416 struct _mesa_glsl_parse_state
*state
)
2419 const struct glsl_type
*decl_type
;
2420 const char *type_name
= NULL
;
2421 ir_rvalue
*result
= NULL
;
2422 YYLTYPE loc
= this->get_location();
2424 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2426 * "To ensure that a particular output variable is invariant, it is
2427 * necessary to use the invariant qualifier. It can either be used to
2428 * qualify a previously declared variable as being invariant
2430 * invariant gl_Position; // make existing gl_Position be invariant"
2432 * In these cases the parser will set the 'invariant' flag in the declarator
2433 * list, and the type will be NULL.
2435 if (this->invariant
) {
2436 assert(this->type
== NULL
);
2438 if (state
->current_function
!= NULL
) {
2439 _mesa_glsl_error(& loc
, state
,
2440 "All uses of `invariant' keyword must be at global "
2444 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2445 assert(!decl
->is_array
);
2446 assert(decl
->array_size
== NULL
);
2447 assert(decl
->initializer
== NULL
);
2449 ir_variable
*const earlier
=
2450 state
->symbols
->get_variable(decl
->identifier
);
2451 if (earlier
== NULL
) {
2452 _mesa_glsl_error(& loc
, state
,
2453 "Undeclared variable `%s' cannot be marked "
2454 "invariant\n", decl
->identifier
);
2455 } else if ((state
->target
== vertex_shader
)
2456 && (earlier
->mode
!= ir_var_shader_out
)) {
2457 _mesa_glsl_error(& loc
, state
,
2458 "`%s' cannot be marked invariant, vertex shader "
2459 "outputs only\n", decl
->identifier
);
2460 } else if ((state
->target
== fragment_shader
)
2461 && (earlier
->mode
!= ir_var_shader_in
)) {
2462 _mesa_glsl_error(& loc
, state
,
2463 "`%s' cannot be marked invariant, fragment shader "
2464 "inputs only\n", decl
->identifier
);
2465 } else if (earlier
->used
) {
2466 _mesa_glsl_error(& loc
, state
,
2467 "variable `%s' may not be redeclared "
2468 "`invariant' after being used",
2471 earlier
->invariant
= true;
2475 /* Invariant redeclarations do not have r-values.
2480 assert(this->type
!= NULL
);
2481 assert(!this->invariant
);
2483 /* The type specifier may contain a structure definition. Process that
2484 * before any of the variable declarations.
2486 (void) this->type
->specifier
->hir(instructions
, state
);
2488 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2489 if (this->declarations
.is_empty()) {
2490 /* If there is no structure involved in the program text, there are two
2491 * possible scenarios:
2493 * - The program text contained something like 'vec4;'. This is an
2494 * empty declaration. It is valid but weird. Emit a warning.
2496 * - The program text contained something like 'S;' and 'S' is not the
2497 * name of a known structure type. This is both invalid and weird.
2500 * Note that if decl_type is NULL and there is a structure involved,
2501 * there must have been some sort of error with the structure. In this
2502 * case we assume that an error was already generated on this line of
2503 * code for the structure. There is no need to generate an additional,
2506 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2508 if (this->type
->specifier
->structure
== NULL
) {
2509 if (decl_type
!= NULL
) {
2510 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2512 _mesa_glsl_error(&loc
, state
,
2513 "invalid type `%s' in empty declaration",
2519 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2520 const struct glsl_type
*var_type
;
2523 /* FINISHME: Emit a warning if a variable declaration shadows a
2524 * FINISHME: declaration at a higher scope.
2527 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2528 if (type_name
!= NULL
) {
2529 _mesa_glsl_error(& loc
, state
,
2530 "invalid type `%s' in declaration of `%s'",
2531 type_name
, decl
->identifier
);
2533 _mesa_glsl_error(& loc
, state
,
2534 "invalid type in declaration of `%s'",
2540 if (decl
->is_array
) {
2541 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2543 if (var_type
->is_error())
2546 var_type
= decl_type
;
2549 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2551 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2553 * "Global variables can only use the qualifiers const,
2554 * attribute, uni form, or varying. Only one may be
2557 * Local variables can only use the qualifier const."
2559 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2560 * any extension that adds the 'layout' keyword.
2562 if (!state
->is_version(130, 300)
2563 && !state
->ARB_explicit_attrib_location_enable
2564 && !state
->ARB_fragment_coord_conventions_enable
) {
2565 if (this->type
->qualifier
.flags
.q
.out
) {
2566 _mesa_glsl_error(& loc
, state
,
2567 "`out' qualifier in declaration of `%s' "
2568 "only valid for function parameters in %s.",
2569 decl
->identifier
, state
->get_version_string());
2571 if (this->type
->qualifier
.flags
.q
.in
) {
2572 _mesa_glsl_error(& loc
, state
,
2573 "`in' qualifier in declaration of `%s' "
2574 "only valid for function parameters in %s.",
2575 decl
->identifier
, state
->get_version_string());
2577 /* FINISHME: Test for other invalid qualifiers. */
2580 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2581 & loc
, this->ubo_qualifiers_valid
, false);
2583 if (this->type
->qualifier
.flags
.q
.invariant
) {
2584 if ((state
->target
== vertex_shader
) &&
2585 var
->mode
!= ir_var_shader_out
) {
2586 _mesa_glsl_error(& loc
, state
,
2587 "`%s' cannot be marked invariant, vertex shader "
2588 "outputs only\n", var
->name
);
2589 } else if ((state
->target
== fragment_shader
) &&
2590 var
->mode
!= ir_var_shader_in
) {
2591 /* FINISHME: Note that this doesn't work for invariant on
2592 * a function signature inval
2594 _mesa_glsl_error(& loc
, state
,
2595 "`%s' cannot be marked invariant, fragment shader "
2596 "inputs only\n", var
->name
);
2600 if (state
->current_function
!= NULL
) {
2601 const char *mode
= NULL
;
2602 const char *extra
= "";
2604 /* There is no need to check for 'inout' here because the parser will
2605 * only allow that in function parameter lists.
2607 if (this->type
->qualifier
.flags
.q
.attribute
) {
2609 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2611 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2613 } else if (this->type
->qualifier
.flags
.q
.in
) {
2615 extra
= " or in function parameter list";
2616 } else if (this->type
->qualifier
.flags
.q
.out
) {
2618 extra
= " or in function parameter list";
2622 _mesa_glsl_error(& loc
, state
,
2623 "%s variable `%s' must be declared at "
2625 mode
, var
->name
, extra
);
2627 } else if (var
->mode
== ir_var_shader_in
) {
2628 var
->read_only
= true;
2630 if (state
->target
== vertex_shader
) {
2631 bool error_emitted
= false;
2633 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2635 * "Vertex shader inputs can only be float, floating-point
2636 * vectors, matrices, signed and unsigned integers and integer
2637 * vectors. Vertex shader inputs can also form arrays of these
2638 * types, but not structures."
2640 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2642 * "Vertex shader inputs can only be float, floating-point
2643 * vectors, matrices, signed and unsigned integers and integer
2644 * vectors. They cannot be arrays or structures."
2646 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2648 * "The attribute qualifier can be used only with float,
2649 * floating-point vectors, and matrices. Attribute variables
2650 * cannot be declared as arrays or structures."
2652 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
2654 * "Vertex shader inputs can only be float, floating-point
2655 * vectors, matrices, signed and unsigned integers and integer
2656 * vectors. Vertex shader inputs cannot be arrays or
2659 const glsl_type
*check_type
= var
->type
->is_array()
2660 ? var
->type
->fields
.array
: var
->type
;
2662 switch (check_type
->base_type
) {
2663 case GLSL_TYPE_FLOAT
:
2665 case GLSL_TYPE_UINT
:
2667 if (state
->is_version(120, 300))
2671 _mesa_glsl_error(& loc
, state
,
2672 "vertex shader input / attribute cannot have "
2674 var
->type
->is_array() ? "array of " : "",
2676 error_emitted
= true;
2679 if (!error_emitted
&& var
->type
->is_array() &&
2680 !state
->check_version(140, 0, &loc
,
2681 "vertex shader input / attribute "
2682 "cannot have array type")) {
2683 error_emitted
= true;
2688 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2689 * so must integer vertex outputs.
2691 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2692 * "Fragment shader inputs that are signed or unsigned integers or
2693 * integer vectors must be qualified with the interpolation qualifier
2696 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2697 * "Fragment shader inputs that are, or contain, signed or unsigned
2698 * integers or integer vectors must be qualified with the
2699 * interpolation qualifier flat."
2701 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2702 * "Vertex shader outputs that are, or contain, signed or unsigned
2703 * integers or integer vectors must be qualified with the
2704 * interpolation qualifier flat."
2706 * Note that prior to GLSL 1.50, this requirement applied to vertex
2707 * outputs rather than fragment inputs. That creates problems in the
2708 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2709 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2710 * apply the restriction to both vertex outputs and fragment inputs.
2712 * Note also that the desktop GLSL specs are missing the text "or
2713 * contain"; this is presumably an oversight, since there is no
2714 * reasonable way to interpolate a fragment shader input that contains
2717 if (state
->is_version(130, 300) &&
2718 var
->type
->contains_integer() &&
2719 var
->interpolation
!= INTERP_QUALIFIER_FLAT
&&
2720 ((state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)
2721 || (state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
2722 && state
->es_shader
))) {
2723 const char *var_type
= (state
->target
== vertex_shader
) ?
2724 "vertex output" : "fragment input";
2725 _mesa_glsl_error(&loc
, state
, "If a %s is (or contains) "
2726 "an integer, then it must be qualified with 'flat'",
2731 /* Interpolation qualifiers cannot be applied to 'centroid' and
2732 * 'centroid varying'.
2734 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2735 * "interpolation qualifiers may only precede the qualifiers in,
2736 * centroid in, out, or centroid out in a declaration. They do not apply
2737 * to the deprecated storage qualifiers varying or centroid varying."
2739 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2741 if (state
->is_version(130, 0)
2742 && this->type
->qualifier
.has_interpolation()
2743 && this->type
->qualifier
.flags
.q
.varying
) {
2745 const char *i
= this->type
->qualifier
.interpolation_string();
2748 if (this->type
->qualifier
.flags
.q
.centroid
)
2749 s
= "centroid varying";
2753 _mesa_glsl_error(&loc
, state
,
2754 "qualifier '%s' cannot be applied to the "
2755 "deprecated storage qualifier '%s'", i
, s
);
2759 /* Interpolation qualifiers can only apply to vertex shader outputs and
2760 * fragment shader inputs.
2762 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2763 * "Outputs from a vertex shader (out) and inputs to a fragment
2764 * shader (in) can be further qualified with one or more of these
2765 * interpolation qualifiers"
2767 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
2768 * "These interpolation qualifiers may only precede the qualifiers
2769 * in, centroid in, out, or centroid out in a declaration. They do
2770 * not apply to inputs into a vertex shader or outputs from a
2773 if (state
->is_version(130, 300)
2774 && this->type
->qualifier
.has_interpolation()) {
2776 const char *i
= this->type
->qualifier
.interpolation_string();
2779 switch (state
->target
) {
2781 if (this->type
->qualifier
.flags
.q
.in
) {
2782 _mesa_glsl_error(&loc
, state
,
2783 "qualifier '%s' cannot be applied to vertex "
2784 "shader inputs", i
);
2787 case fragment_shader
:
2788 if (this->type
->qualifier
.flags
.q
.out
) {
2789 _mesa_glsl_error(&loc
, state
,
2790 "qualifier '%s' cannot be applied to fragment "
2791 "shader outputs", i
);
2800 /* From section 4.3.4 of the GLSL 1.30 spec:
2801 * "It is an error to use centroid in in a vertex shader."
2803 * From section 4.3.4 of the GLSL ES 3.00 spec:
2804 * "It is an error to use centroid in or interpolation qualifiers in
2805 * a vertex shader input."
2807 if (state
->is_version(130, 300)
2808 && this->type
->qualifier
.flags
.q
.centroid
2809 && this->type
->qualifier
.flags
.q
.in
2810 && state
->target
== vertex_shader
) {
2812 _mesa_glsl_error(&loc
, state
,
2813 "'centroid in' cannot be used in a vertex shader");
2817 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2819 if (this->type
->specifier
->precision
!= ast_precision_none
) {
2820 state
->check_precision_qualifiers_allowed(&loc
);
2824 /* Precision qualifiers only apply to floating point and integer types.
2826 * From section 4.5.2 of the GLSL 1.30 spec:
2827 * "Any floating point or any integer declaration can have the type
2828 * preceded by one of these precision qualifiers [...] Literal
2829 * constants do not have precision qualifiers. Neither do Boolean
2832 * In GLSL ES, sampler types are also allowed.
2834 * From page 87 of the GLSL ES spec:
2835 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2837 if (this->type
->specifier
->precision
!= ast_precision_none
2838 && !var
->type
->is_float()
2839 && !var
->type
->is_integer()
2840 && !(var
->type
->is_sampler() && state
->es_shader
)
2841 && !(var
->type
->is_array()
2842 && (var
->type
->fields
.array
->is_float()
2843 || var
->type
->fields
.array
->is_integer()))) {
2845 _mesa_glsl_error(&loc
, state
,
2846 "precision qualifiers apply only to floating point"
2847 "%s types", state
->es_shader
? ", integer, and sampler"
2851 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2853 * "[Sampler types] can only be declared as function
2854 * parameters or uniform variables (see Section 4.3.5
2857 if (var_type
->contains_sampler() &&
2858 !this->type
->qualifier
.flags
.q
.uniform
) {
2859 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2862 /* Process the initializer and add its instructions to a temporary
2863 * list. This list will be added to the instruction stream (below) after
2864 * the declaration is added. This is done because in some cases (such as
2865 * redeclarations) the declaration may not actually be added to the
2866 * instruction stream.
2868 exec_list initializer_instructions
;
2869 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2871 if (decl
->initializer
!= NULL
) {
2872 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2874 &initializer_instructions
, state
);
2877 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2879 * "It is an error to write to a const variable outside of
2880 * its declaration, so they must be initialized when
2883 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2884 _mesa_glsl_error(& loc
, state
,
2885 "const declaration of `%s' must be initialized",
2889 /* If the declaration is not a redeclaration, there are a few additional
2890 * semantic checks that must be applied. In addition, variable that was
2891 * created for the declaration should be added to the IR stream.
2893 if (earlier
== NULL
) {
2894 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2896 * "Identifiers starting with "gl_" are reserved for use by
2897 * OpenGL, and may not be declared in a shader as either a
2898 * variable or a function."
2900 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2901 _mesa_glsl_error(& loc
, state
,
2902 "identifier `%s' uses reserved `gl_' prefix",
2904 else if (strstr(decl
->identifier
, "__")) {
2905 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2908 * "In addition, all identifiers containing two
2909 * consecutive underscores (__) are reserved as
2910 * possible future keywords."
2912 _mesa_glsl_error(& loc
, state
,
2913 "identifier `%s' uses reserved `__' string",
2917 /* Add the variable to the symbol table. Note that the initializer's
2918 * IR was already processed earlier (though it hasn't been emitted
2919 * yet), without the variable in scope.
2921 * This differs from most C-like languages, but it follows the GLSL
2922 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2925 * "Within a declaration, the scope of a name starts immediately
2926 * after the initializer if present or immediately after the name
2927 * being declared if not."
2929 if (!state
->symbols
->add_variable(var
)) {
2930 YYLTYPE loc
= this->get_location();
2931 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2932 "current scope", decl
->identifier
);
2936 /* Push the variable declaration to the top. It means that all the
2937 * variable declarations will appear in a funny last-to-first order,
2938 * but otherwise we run into trouble if a function is prototyped, a
2939 * global var is decled, then the function is defined with usage of
2940 * the global var. See glslparsertest's CorrectModule.frag.
2942 instructions
->push_head(var
);
2945 instructions
->append_list(&initializer_instructions
);
2949 /* Generally, variable declarations do not have r-values. However,
2950 * one is used for the declaration in
2952 * while (bool b = some_condition()) {
2956 * so we return the rvalue from the last seen declaration here.
2963 ast_parameter_declarator::hir(exec_list
*instructions
,
2964 struct _mesa_glsl_parse_state
*state
)
2967 const struct glsl_type
*type
;
2968 const char *name
= NULL
;
2969 YYLTYPE loc
= this->get_location();
2971 type
= this->type
->specifier
->glsl_type(& name
, state
);
2975 _mesa_glsl_error(& loc
, state
,
2976 "invalid type `%s' in declaration of `%s'",
2977 name
, this->identifier
);
2979 _mesa_glsl_error(& loc
, state
,
2980 "invalid type in declaration of `%s'",
2984 type
= glsl_type::error_type
;
2987 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2989 * "Functions that accept no input arguments need not use void in the
2990 * argument list because prototypes (or definitions) are required and
2991 * therefore there is no ambiguity when an empty argument list "( )" is
2992 * declared. The idiom "(void)" as a parameter list is provided for
2995 * Placing this check here prevents a void parameter being set up
2996 * for a function, which avoids tripping up checks for main taking
2997 * parameters and lookups of an unnamed symbol.
2999 if (type
->is_void()) {
3000 if (this->identifier
!= NULL
)
3001 _mesa_glsl_error(& loc
, state
,
3002 "named parameter cannot have type `void'");
3008 if (formal_parameter
&& (this->identifier
== NULL
)) {
3009 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3013 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3014 * call already handled the "vec4[..] foo" case.
3016 if (this->is_array
) {
3017 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3020 if (!type
->is_error() && type
->array_size() == 0) {
3021 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3022 "a declared size.");
3023 type
= glsl_type::error_type
;
3027 ir_variable
*var
= new(ctx
)
3028 ir_variable(type
, this->identifier
, ir_var_function_in
);
3030 /* Apply any specified qualifiers to the parameter declaration. Note that
3031 * for function parameters the default mode is 'in'.
3033 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3036 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3038 * "Samplers cannot be treated as l-values; hence cannot be used
3039 * as out or inout function parameters, nor can they be assigned
3042 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3043 && type
->contains_sampler()) {
3044 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3045 type
= glsl_type::error_type
;
3048 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3050 * "When calling a function, expressions that do not evaluate to
3051 * l-values cannot be passed to parameters declared as out or inout."
3053 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3055 * "Other binary or unary expressions, non-dereferenced arrays,
3056 * function names, swizzles with repeated fields, and constants
3057 * cannot be l-values."
3059 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3060 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3062 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3064 && !state
->check_version(120, 100, &loc
,
3065 "Arrays cannot be out or inout parameters")) {
3066 type
= glsl_type::error_type
;
3069 instructions
->push_tail(var
);
3071 /* Parameter declarations do not have r-values.
3078 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3080 exec_list
*ir_parameters
,
3081 _mesa_glsl_parse_state
*state
)
3083 ast_parameter_declarator
*void_param
= NULL
;
3086 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3087 param
->formal_parameter
= formal
;
3088 param
->hir(ir_parameters
, state
);
3096 if ((void_param
!= NULL
) && (count
> 1)) {
3097 YYLTYPE loc
= void_param
->get_location();
3099 _mesa_glsl_error(& loc
, state
,
3100 "`void' parameter must be only parameter");
3106 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3108 /* IR invariants disallow function declarations or definitions
3109 * nested within other function definitions. But there is no
3110 * requirement about the relative order of function declarations
3111 * and definitions with respect to one another. So simply insert
3112 * the new ir_function block at the end of the toplevel instruction
3115 state
->toplevel_ir
->push_tail(f
);
3120 ast_function::hir(exec_list
*instructions
,
3121 struct _mesa_glsl_parse_state
*state
)
3124 ir_function
*f
= NULL
;
3125 ir_function_signature
*sig
= NULL
;
3126 exec_list hir_parameters
;
3128 const char *const name
= identifier
;
3130 /* New functions are always added to the top-level IR instruction stream,
3131 * so this instruction list pointer is ignored. See also emit_function
3134 (void) instructions
;
3136 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3138 * "Function declarations (prototypes) cannot occur inside of functions;
3139 * they must be at global scope, or for the built-in functions, outside
3140 * the global scope."
3142 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3144 * "User defined functions may only be defined within the global scope."
3146 * Note that this language does not appear in GLSL 1.10.
3148 if ((state
->current_function
!= NULL
) &&
3149 state
->is_version(120, 100)) {
3150 YYLTYPE loc
= this->get_location();
3151 _mesa_glsl_error(&loc
, state
,
3152 "declaration of function `%s' not allowed within "
3153 "function body", name
);
3156 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3158 * "Identifiers starting with "gl_" are reserved for use by
3159 * OpenGL, and may not be declared in a shader as either a
3160 * variable or a function."
3162 if (strncmp(name
, "gl_", 3) == 0) {
3163 YYLTYPE loc
= this->get_location();
3164 _mesa_glsl_error(&loc
, state
,
3165 "identifier `%s' uses reserved `gl_' prefix", name
);
3168 /* Convert the list of function parameters to HIR now so that they can be
3169 * used below to compare this function's signature with previously seen
3170 * signatures for functions with the same name.
3172 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3174 & hir_parameters
, state
);
3176 const char *return_type_name
;
3177 const glsl_type
*return_type
=
3178 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3181 YYLTYPE loc
= this->get_location();
3182 _mesa_glsl_error(&loc
, state
,
3183 "function `%s' has undeclared return type `%s'",
3184 name
, return_type_name
);
3185 return_type
= glsl_type::error_type
;
3188 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3189 * "No qualifier is allowed on the return type of a function."
3191 if (this->return_type
->has_qualifiers()) {
3192 YYLTYPE loc
= this->get_location();
3193 _mesa_glsl_error(& loc
, state
,
3194 "function `%s' return type has qualifiers", name
);
3197 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3199 * "[Sampler types] can only be declared as function parameters
3200 * or uniform variables (see Section 4.3.5 "Uniform")".
3202 if (return_type
->contains_sampler()) {
3203 YYLTYPE loc
= this->get_location();
3204 _mesa_glsl_error(&loc
, state
,
3205 "function `%s' return type can't contain a sampler",
3209 /* Verify that this function's signature either doesn't match a previously
3210 * seen signature for a function with the same name, or, if a match is found,
3211 * that the previously seen signature does not have an associated definition.
3213 f
= state
->symbols
->get_function(name
);
3214 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3215 sig
= f
->exact_matching_signature(&hir_parameters
);
3217 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3218 if (badvar
!= NULL
) {
3219 YYLTYPE loc
= this->get_location();
3221 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3222 "qualifiers don't match prototype", name
, badvar
);
3225 if (sig
->return_type
!= return_type
) {
3226 YYLTYPE loc
= this->get_location();
3228 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3229 "match prototype", name
);
3232 if (sig
->is_defined
) {
3233 if (is_definition
) {
3234 YYLTYPE loc
= this->get_location();
3235 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3237 /* We just encountered a prototype that exactly matches a
3238 * function that's already been defined. This is redundant,
3239 * and we should ignore it.
3246 f
= new(ctx
) ir_function(name
);
3247 if (!state
->symbols
->add_function(f
)) {
3248 /* This function name shadows a non-function use of the same name. */
3249 YYLTYPE loc
= this->get_location();
3251 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3252 "non-function", name
);
3256 emit_function(state
, f
);
3259 /* Verify the return type of main() */
3260 if (strcmp(name
, "main") == 0) {
3261 if (! return_type
->is_void()) {
3262 YYLTYPE loc
= this->get_location();
3264 _mesa_glsl_error(& loc
, state
, "main() must return void");
3267 if (!hir_parameters
.is_empty()) {
3268 YYLTYPE loc
= this->get_location();
3270 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3274 /* Finish storing the information about this new function in its signature.
3277 sig
= new(ctx
) ir_function_signature(return_type
);
3278 f
->add_signature(sig
);
3281 sig
->replace_parameters(&hir_parameters
);
3284 /* Function declarations (prototypes) do not have r-values.
3291 ast_function_definition::hir(exec_list
*instructions
,
3292 struct _mesa_glsl_parse_state
*state
)
3294 prototype
->is_definition
= true;
3295 prototype
->hir(instructions
, state
);
3297 ir_function_signature
*signature
= prototype
->signature
;
3298 if (signature
== NULL
)
3301 assert(state
->current_function
== NULL
);
3302 state
->current_function
= signature
;
3303 state
->found_return
= false;
3305 /* Duplicate parameters declared in the prototype as concrete variables.
3306 * Add these to the symbol table.
3308 state
->symbols
->push_scope();
3309 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3310 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3312 assert(var
!= NULL
);
3314 /* The only way a parameter would "exist" is if two parameters have
3317 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3318 YYLTYPE loc
= this->get_location();
3320 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3322 state
->symbols
->add_variable(var
);
3326 /* Convert the body of the function to HIR. */
3327 this->body
->hir(&signature
->body
, state
);
3328 signature
->is_defined
= true;
3330 state
->symbols
->pop_scope();
3332 assert(state
->current_function
== signature
);
3333 state
->current_function
= NULL
;
3335 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3336 YYLTYPE loc
= this->get_location();
3337 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3338 "%s, but no return statement",
3339 signature
->function_name(),
3340 signature
->return_type
->name
);
3343 /* Function definitions do not have r-values.
3350 ast_jump_statement::hir(exec_list
*instructions
,
3351 struct _mesa_glsl_parse_state
*state
)
3358 assert(state
->current_function
);
3360 if (opt_return_value
) {
3361 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3363 /* The value of the return type can be NULL if the shader says
3364 * 'return foo();' and foo() is a function that returns void.
3366 * NOTE: The GLSL spec doesn't say that this is an error. The type
3367 * of the return value is void. If the return type of the function is
3368 * also void, then this should compile without error. Seriously.
3370 const glsl_type
*const ret_type
=
3371 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3373 /* Implicit conversions are not allowed for return values. */
3374 if (state
->current_function
->return_type
!= ret_type
) {
3375 YYLTYPE loc
= this->get_location();
3377 _mesa_glsl_error(& loc
, state
,
3378 "`return' with wrong type %s, in function `%s' "
3381 state
->current_function
->function_name(),
3382 state
->current_function
->return_type
->name
);
3385 inst
= new(ctx
) ir_return(ret
);
3387 if (state
->current_function
->return_type
->base_type
!=
3389 YYLTYPE loc
= this->get_location();
3391 _mesa_glsl_error(& loc
, state
,
3392 "`return' with no value, in function %s returning "
3394 state
->current_function
->function_name());
3396 inst
= new(ctx
) ir_return
;
3399 state
->found_return
= true;
3400 instructions
->push_tail(inst
);
3405 if (state
->target
!= fragment_shader
) {
3406 YYLTYPE loc
= this->get_location();
3408 _mesa_glsl_error(& loc
, state
,
3409 "`discard' may only appear in a fragment shader");
3411 instructions
->push_tail(new(ctx
) ir_discard
);
3416 if (mode
== ast_continue
&&
3417 state
->loop_nesting_ast
== NULL
) {
3418 YYLTYPE loc
= this->get_location();
3420 _mesa_glsl_error(& loc
, state
,
3421 "continue may only appear in a loop");
3422 } else if (mode
== ast_break
&&
3423 state
->loop_nesting_ast
== NULL
&&
3424 state
->switch_state
.switch_nesting_ast
== NULL
) {
3425 YYLTYPE loc
= this->get_location();
3427 _mesa_glsl_error(& loc
, state
,
3428 "break may only appear in a loop or a switch");
3430 /* For a loop, inline the for loop expression again,
3431 * since we don't know where near the end of
3432 * the loop body the normal copy of it
3433 * is going to be placed.
3435 if (state
->loop_nesting_ast
!= NULL
&&
3436 mode
== ast_continue
&&
3437 state
->loop_nesting_ast
->rest_expression
) {
3438 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3442 if (state
->switch_state
.is_switch_innermost
&&
3443 mode
== ast_break
) {
3444 /* Force break out of switch by setting is_break switch state.
3446 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3447 ir_dereference_variable
*const deref_is_break_var
=
3448 new(ctx
) ir_dereference_variable(is_break_var
);
3449 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3450 ir_assignment
*const set_break_var
=
3451 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3453 instructions
->push_tail(set_break_var
);
3456 ir_loop_jump
*const jump
=
3457 new(ctx
) ir_loop_jump((mode
== ast_break
)
3458 ? ir_loop_jump::jump_break
3459 : ir_loop_jump::jump_continue
);
3460 instructions
->push_tail(jump
);
3467 /* Jump instructions do not have r-values.
3474 ast_selection_statement::hir(exec_list
*instructions
,
3475 struct _mesa_glsl_parse_state
*state
)
3479 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3481 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3483 * "Any expression whose type evaluates to a Boolean can be used as the
3484 * conditional expression bool-expression. Vector types are not accepted
3485 * as the expression to if."
3487 * The checks are separated so that higher quality diagnostics can be
3488 * generated for cases where both rules are violated.
3490 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3491 YYLTYPE loc
= this->condition
->get_location();
3493 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3497 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3499 if (then_statement
!= NULL
) {
3500 state
->symbols
->push_scope();
3501 then_statement
->hir(& stmt
->then_instructions
, state
);
3502 state
->symbols
->pop_scope();
3505 if (else_statement
!= NULL
) {
3506 state
->symbols
->push_scope();
3507 else_statement
->hir(& stmt
->else_instructions
, state
);
3508 state
->symbols
->pop_scope();
3511 instructions
->push_tail(stmt
);
3513 /* if-statements do not have r-values.
3520 ast_switch_statement::hir(exec_list
*instructions
,
3521 struct _mesa_glsl_parse_state
*state
)
3525 ir_rvalue
*const test_expression
=
3526 this->test_expression
->hir(instructions
, state
);
3528 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3530 * "The type of init-expression in a switch statement must be a
3533 if (!test_expression
->type
->is_scalar() ||
3534 !test_expression
->type
->is_integer()) {
3535 YYLTYPE loc
= this->test_expression
->get_location();
3537 _mesa_glsl_error(& loc
,
3539 "switch-statement expression must be scalar "
3543 /* Track the switch-statement nesting in a stack-like manner.
3545 struct glsl_switch_state saved
= state
->switch_state
;
3547 state
->switch_state
.is_switch_innermost
= true;
3548 state
->switch_state
.switch_nesting_ast
= this;
3549 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3550 hash_table_pointer_compare
);
3551 state
->switch_state
.previous_default
= NULL
;
3553 /* Initalize is_fallthru state to false.
3555 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3556 state
->switch_state
.is_fallthru_var
=
3557 new(ctx
) ir_variable(glsl_type::bool_type
,
3558 "switch_is_fallthru_tmp",
3560 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3562 ir_dereference_variable
*deref_is_fallthru_var
=
3563 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3564 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3567 /* Initalize is_break state to false.
3569 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3570 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3571 "switch_is_break_tmp",
3573 instructions
->push_tail(state
->switch_state
.is_break_var
);
3575 ir_dereference_variable
*deref_is_break_var
=
3576 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3577 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3580 /* Cache test expression.
3582 test_to_hir(instructions
, state
);
3584 /* Emit code for body of switch stmt.
3586 body
->hir(instructions
, state
);
3588 hash_table_dtor(state
->switch_state
.labels_ht
);
3590 state
->switch_state
= saved
;
3592 /* Switch statements do not have r-values. */
3598 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3599 struct _mesa_glsl_parse_state
*state
)
3603 /* Cache value of test expression. */
3604 ir_rvalue
*const test_val
=
3605 test_expression
->hir(instructions
,
3608 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3611 ir_dereference_variable
*deref_test_var
=
3612 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3614 instructions
->push_tail(state
->switch_state
.test_var
);
3615 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
3620 ast_switch_body::hir(exec_list
*instructions
,
3621 struct _mesa_glsl_parse_state
*state
)
3624 stmts
->hir(instructions
, state
);
3626 /* Switch bodies do not have r-values. */
3631 ast_case_statement_list::hir(exec_list
*instructions
,
3632 struct _mesa_glsl_parse_state
*state
)
3634 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3635 case_stmt
->hir(instructions
, state
);
3637 /* Case statements do not have r-values. */
3642 ast_case_statement::hir(exec_list
*instructions
,
3643 struct _mesa_glsl_parse_state
*state
)
3645 labels
->hir(instructions
, state
);
3647 /* Conditionally set fallthru state based on break state. */
3648 ir_constant
*const false_val
= new(state
) ir_constant(false);
3649 ir_dereference_variable
*const deref_is_fallthru_var
=
3650 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3651 ir_dereference_variable
*const deref_is_break_var
=
3652 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3653 ir_assignment
*const reset_fallthru_on_break
=
3654 new(state
) ir_assignment(deref_is_fallthru_var
,
3656 deref_is_break_var
);
3657 instructions
->push_tail(reset_fallthru_on_break
);
3659 /* Guard case statements depending on fallthru state. */
3660 ir_dereference_variable
*const deref_fallthru_guard
=
3661 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3662 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3664 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3665 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3667 instructions
->push_tail(test_fallthru
);
3669 /* Case statements do not have r-values. */
3675 ast_case_label_list::hir(exec_list
*instructions
,
3676 struct _mesa_glsl_parse_state
*state
)
3678 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3679 label
->hir(instructions
, state
);
3681 /* Case labels do not have r-values. */
3686 ast_case_label::hir(exec_list
*instructions
,
3687 struct _mesa_glsl_parse_state
*state
)
3691 ir_dereference_variable
*deref_fallthru_var
=
3692 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3694 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3696 /* If not default case, ... */
3697 if (this->test_value
!= NULL
) {
3698 /* Conditionally set fallthru state based on
3699 * comparison of cached test expression value to case label.
3701 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3702 ir_constant
*label_const
= label_rval
->constant_expression_value();
3705 YYLTYPE loc
= this->test_value
->get_location();
3707 _mesa_glsl_error(& loc
, state
,
3708 "switch statement case label must be a "
3709 "constant expression");
3711 /* Stuff a dummy value in to allow processing to continue. */
3712 label_const
= new(ctx
) ir_constant(0);
3714 ast_expression
*previous_label
= (ast_expression
*)
3715 hash_table_find(state
->switch_state
.labels_ht
,
3716 (void *)(uintptr_t)label_const
->value
.u
[0]);
3718 if (previous_label
) {
3719 YYLTYPE loc
= this->test_value
->get_location();
3720 _mesa_glsl_error(& loc
, state
,
3721 "duplicate case value");
3723 loc
= previous_label
->get_location();
3724 _mesa_glsl_error(& loc
, state
,
3725 "this is the previous case label");
3727 hash_table_insert(state
->switch_state
.labels_ht
,
3729 (void *)(uintptr_t)label_const
->value
.u
[0]);
3733 ir_dereference_variable
*deref_test_var
=
3734 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3736 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3740 ir_assignment
*set_fallthru_on_test
=
3741 new(ctx
) ir_assignment(deref_fallthru_var
,
3745 instructions
->push_tail(set_fallthru_on_test
);
3746 } else { /* default case */
3747 if (state
->switch_state
.previous_default
) {
3748 YYLTYPE loc
= this->get_location();
3749 _mesa_glsl_error(& loc
, state
,
3750 "multiple default labels in one switch");
3752 loc
= state
->switch_state
.previous_default
->get_location();
3753 _mesa_glsl_error(& loc
, state
,
3754 "this is the first default label");
3756 state
->switch_state
.previous_default
= this;
3758 /* Set falltrhu state. */
3759 ir_assignment
*set_fallthru
=
3760 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
3762 instructions
->push_tail(set_fallthru
);
3765 /* Case statements do not have r-values. */
3770 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3771 struct _mesa_glsl_parse_state
*state
)
3775 if (condition
!= NULL
) {
3776 ir_rvalue
*const cond
=
3777 condition
->hir(& stmt
->body_instructions
, state
);
3780 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3781 YYLTYPE loc
= condition
->get_location();
3783 _mesa_glsl_error(& loc
, state
,
3784 "loop condition must be scalar boolean");
3786 /* As the first code in the loop body, generate a block that looks
3787 * like 'if (!condition) break;' as the loop termination condition.
3789 ir_rvalue
*const not_cond
=
3790 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
3792 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3794 ir_jump
*const break_stmt
=
3795 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3797 if_stmt
->then_instructions
.push_tail(break_stmt
);
3798 stmt
->body_instructions
.push_tail(if_stmt
);
3805 ast_iteration_statement::hir(exec_list
*instructions
,
3806 struct _mesa_glsl_parse_state
*state
)
3810 /* For-loops and while-loops start a new scope, but do-while loops do not.
3812 if (mode
!= ast_do_while
)
3813 state
->symbols
->push_scope();
3815 if (init_statement
!= NULL
)
3816 init_statement
->hir(instructions
, state
);
3818 ir_loop
*const stmt
= new(ctx
) ir_loop();
3819 instructions
->push_tail(stmt
);
3821 /* Track the current loop nesting. */
3822 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3824 state
->loop_nesting_ast
= this;
3826 /* Likewise, indicate that following code is closest to a loop,
3827 * NOT closest to a switch.
3829 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3830 state
->switch_state
.is_switch_innermost
= false;
3832 if (mode
!= ast_do_while
)
3833 condition_to_hir(stmt
, state
);
3836 body
->hir(& stmt
->body_instructions
, state
);
3838 if (rest_expression
!= NULL
)
3839 rest_expression
->hir(& stmt
->body_instructions
, state
);
3841 if (mode
== ast_do_while
)
3842 condition_to_hir(stmt
, state
);
3844 if (mode
!= ast_do_while
)
3845 state
->symbols
->pop_scope();
3847 /* Restore previous nesting before returning. */
3848 state
->loop_nesting_ast
= nesting_ast
;
3849 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3851 /* Loops do not have r-values.
3858 * Determine if the given type is valid for establishing a default precision
3861 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
3863 * "The precision statement
3865 * precision precision-qualifier type;
3867 * can be used to establish a default precision qualifier. The type field
3868 * can be either int or float or any of the sampler types, and the
3869 * precision-qualifier can be lowp, mediump, or highp."
3871 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
3872 * qualifiers on sampler types, but this seems like an oversight (since the
3873 * intention of including these in GLSL 1.30 is to allow compatibility with ES
3874 * shaders). So we allow int, float, and all sampler types regardless of GLSL
3878 is_valid_default_precision_type(const struct _mesa_glsl_parse_state
*state
,
3879 const char *type_name
)
3881 const struct glsl_type
*type
= state
->symbols
->get_type(type_name
);
3885 switch (type
->base_type
) {
3887 case GLSL_TYPE_FLOAT
:
3888 /* "int" and "float" are valid, but vectors and matrices are not. */
3889 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
3890 case GLSL_TYPE_SAMPLER
:
3899 ast_type_specifier::hir(exec_list
*instructions
,
3900 struct _mesa_glsl_parse_state
*state
)
3902 if (!this->is_precision_statement
&& this->structure
== NULL
)
3905 YYLTYPE loc
= this->get_location();
3907 if (this->precision
!= ast_precision_none
3908 && !state
->check_precision_qualifiers_allowed(&loc
)) {
3911 if (this->precision
!= ast_precision_none
3912 && this->structure
!= NULL
) {
3913 _mesa_glsl_error(&loc
, state
,
3914 "precision qualifiers do not apply to structures");
3918 /* If this is a precision statement, check that the type to which it is
3919 * applied is either float or int.
3921 * From section 4.5.3 of the GLSL 1.30 spec:
3922 * "The precision statement
3923 * precision precision-qualifier type;
3924 * can be used to establish a default precision qualifier. The type
3925 * field can be either int or float [...]. Any other types or
3926 * qualifiers will result in an error.
3928 if (this->is_precision_statement
) {
3929 assert(this->precision
!= ast_precision_none
);
3930 assert(this->structure
== NULL
); /* The check for structures was
3931 * performed above. */
3932 if (this->is_array
) {
3933 _mesa_glsl_error(&loc
, state
,
3934 "default precision statements do not apply to "
3938 if (!is_valid_default_precision_type(state
, this->type_name
)) {
3939 _mesa_glsl_error(&loc
, state
,
3940 "default precision statements apply only to types "
3941 "float, int, and sampler types");
3945 /* FINISHME: Translate precision statements into IR. */
3949 if (this->structure
!= NULL
)
3950 return this->structure
->hir(instructions
, state
);
3957 * Process a structure or interface block tree into an array of structure fields
3959 * After parsing, where there are some syntax differnces, structures and
3960 * interface blocks are almost identical. They are similar enough that the
3961 * AST for each can be processed the same way into a set of
3962 * \c glsl_struct_field to describe the members.
3965 * The number of fields processed. A pointer to the array structure fields is
3966 * stored in \c *fields_ret.
3969 ast_process_structure_or_interface_block(exec_list
*instructions
,
3970 struct _mesa_glsl_parse_state
*state
,
3971 exec_list
*declarations
,
3973 glsl_struct_field
**fields_ret
,
3975 bool block_row_major
)
3977 unsigned decl_count
= 0;
3979 /* Make an initial pass over the list of fields to determine how
3980 * many there are. Each element in this list is an ast_declarator_list.
3981 * This means that we actually need to count the number of elements in the
3982 * 'declarations' list in each of the elements.
3984 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
3985 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3990 /* Allocate storage for the fields and process the field
3991 * declarations. As the declarations are processed, try to also convert
3992 * the types to HIR. This ensures that structure definitions embedded in
3993 * other structure definitions or in interface blocks are processed.
3995 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3999 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4000 const char *type_name
;
4002 decl_list
->type
->specifier
->hir(instructions
, state
);
4004 /* Section 10.9 of the GLSL ES 1.00 specification states that
4005 * embedded structure definitions have been removed from the language.
4007 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4008 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
4009 "not allowed in GLSL ES 1.00.");
4012 const glsl_type
*decl_type
=
4013 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
4015 foreach_list_typed (ast_declaration
, decl
, link
,
4016 &decl_list
->declarations
) {
4017 /* From the GL_ARB_uniform_buffer_object spec:
4019 * "Sampler types are not allowed inside of uniform
4020 * blocks. All other types, arrays, and structures
4021 * allowed for uniforms are allowed within a uniform
4024 * It should be impossible for decl_type to be NULL here. Cases that
4025 * might naturally lead to decl_type being NULL, especially for the
4026 * is_interface case, will have resulted in compilation having
4027 * already halted due to a syntax error.
4029 const struct glsl_type
*field_type
=
4030 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4032 if (is_interface
&& field_type
->contains_sampler()) {
4033 YYLTYPE loc
= decl_list
->get_location();
4034 _mesa_glsl_error(&loc
, state
,
4035 "Uniform in non-default uniform block contains sampler\n");
4038 const struct ast_type_qualifier
*const qual
=
4039 & decl_list
->type
->qualifier
;
4040 if (qual
->flags
.q
.std140
||
4041 qual
->flags
.q
.packed
||
4042 qual
->flags
.q
.shared
) {
4043 _mesa_glsl_error(&loc
, state
,
4044 "uniform block layout qualifiers std140, packed, and "
4045 "shared can only be applied to uniform blocks, not "
4049 if (decl
->is_array
) {
4050 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4053 fields
[i
].type
= field_type
;
4054 fields
[i
].name
= decl
->identifier
;
4056 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4057 if (!field_type
->is_matrix() && !field_type
->is_record()) {
4058 _mesa_glsl_error(&loc
, state
,
4059 "uniform block layout qualifiers row_major and "
4060 "column_major can only be applied to matrix and "
4063 validate_matrix_layout_for_type(state
, &loc
, field_type
);
4066 if (field_type
->is_matrix() ||
4067 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4068 fields
[i
].row_major
= block_row_major
;
4069 if (qual
->flags
.q
.row_major
)
4070 fields
[i
].row_major
= true;
4071 else if (qual
->flags
.q
.column_major
)
4072 fields
[i
].row_major
= false;
4079 assert(i
== decl_count
);
4081 *fields_ret
= fields
;
4087 ast_struct_specifier::hir(exec_list
*instructions
,
4088 struct _mesa_glsl_parse_state
*state
)
4090 YYLTYPE loc
= this->get_location();
4091 glsl_struct_field
*fields
;
4092 unsigned decl_count
=
4093 ast_process_structure_or_interface_block(instructions
,
4095 &this->declarations
,
4101 const glsl_type
*t
=
4102 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4104 if (!state
->symbols
->add_type(name
, t
)) {
4105 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4107 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4109 state
->num_user_structures
+ 1);
4111 s
[state
->num_user_structures
] = t
;
4112 state
->user_structures
= s
;
4113 state
->num_user_structures
++;
4117 /* Structure type definitions do not have r-values.
4123 ast_interface_block::hir(exec_list
*instructions
,
4124 struct _mesa_glsl_parse_state
*state
)
4126 YYLTYPE loc
= this->get_location();
4128 /* The ast_interface_block has a list of ast_declarator_lists. We
4129 * need to turn those into ir_variables with an association
4130 * with this uniform block.
4132 enum glsl_interface_packing packing
;
4133 if (this->layout
.flags
.q
.shared
) {
4134 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4135 } else if (this->layout
.flags
.q
.packed
) {
4136 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4138 /* The default layout is std140.
4140 packing
= GLSL_INTERFACE_PACKING_STD140
;
4143 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4144 exec_list declared_variables
;
4145 glsl_struct_field
*fields
;
4146 unsigned int num_variables
=
4147 ast_process_structure_or_interface_block(&declared_variables
,
4149 &this->declarations
,
4155 const glsl_type
*block_type
=
4156 glsl_type::get_interface_instance(fields
,
4161 if (!state
->symbols
->add_type(block_type
->name
, block_type
)) {
4162 YYLTYPE loc
= this->get_location();
4163 _mesa_glsl_error(&loc
, state
, "Uniform block name `%s' already taken in "
4164 "the current scope.\n", this->block_name
);
4167 /* Since interface blocks cannot contain statements, it should be
4168 * impossible for the block to generate any instructions.
4170 assert(declared_variables
.is_empty());
4172 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4175 * "If an instance name (instance-name) is used, then it puts all the
4176 * members inside a scope within its own name space, accessed with the
4177 * field selector ( . ) operator (analogously to structures)."
4179 if (this->instance_name
) {
4182 if (this->array_size
!= NULL
) {
4183 const glsl_type
*block_array_type
=
4184 process_array_type(&loc
, block_type
, this->array_size
, state
);
4186 var
= new(state
) ir_variable(block_array_type
,
4187 this->instance_name
,
4190 var
= new(state
) ir_variable(block_type
,
4191 this->instance_name
,
4195 var
->interface_type
= block_type
;
4196 state
->symbols
->add_variable(var
);
4197 instructions
->push_tail(var
);
4199 /* In order to have an array size, the block must also be declared with
4202 assert(this->array_size
== NULL
);
4204 for (unsigned i
= 0; i
< num_variables
; i
++) {
4206 new(state
) ir_variable(fields
[i
].type
,
4207 ralloc_strdup(state
, fields
[i
].name
),
4209 var
->interface_type
= block_type
;
4211 state
->symbols
->add_variable(var
);
4212 instructions
->push_tail(var
);
4220 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
4221 exec_list
*instructions
)
4223 bool gl_FragColor_assigned
= false;
4224 bool gl_FragData_assigned
= false;
4225 bool user_defined_fs_output_assigned
= false;
4226 ir_variable
*user_defined_fs_output
= NULL
;
4228 /* It would be nice to have proper location information. */
4230 memset(&loc
, 0, sizeof(loc
));
4232 foreach_list(node
, instructions
) {
4233 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4235 if (!var
|| !var
->assigned
)
4238 if (strcmp(var
->name
, "gl_FragColor") == 0)
4239 gl_FragColor_assigned
= true;
4240 else if (strcmp(var
->name
, "gl_FragData") == 0)
4241 gl_FragData_assigned
= true;
4242 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4243 if (state
->target
== fragment_shader
&&
4244 var
->mode
== ir_var_shader_out
) {
4245 user_defined_fs_output_assigned
= true;
4246 user_defined_fs_output
= var
;
4251 /* From the GLSL 1.30 spec:
4253 * "If a shader statically assigns a value to gl_FragColor, it
4254 * may not assign a value to any element of gl_FragData. If a
4255 * shader statically writes a value to any element of
4256 * gl_FragData, it may not assign a value to
4257 * gl_FragColor. That is, a shader may assign values to either
4258 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4259 * linked together must also consistently write just one of
4260 * these variables. Similarly, if user declared output
4261 * variables are in use (statically assigned to), then the
4262 * built-in variables gl_FragColor and gl_FragData may not be
4263 * assigned to. These incorrect usages all generate compile
4266 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
4267 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4268 "`gl_FragColor' and `gl_FragData'\n");
4269 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
4270 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4271 "`gl_FragColor' and `%s'\n",
4272 user_defined_fs_output
->name
);
4273 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
4274 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4275 "`gl_FragData' and `%s'\n",
4276 user_defined_fs_output
->name
);